U.S. patent application number 10/233222 was filed with the patent office on 2004-03-04 for exhaust processor.
Invention is credited to Crawley, Wilbur H., Nohl, John.
Application Number | 20040040290 10/233222 |
Document ID | / |
Family ID | 31495412 |
Filed Date | 2004-03-04 |
United States Patent
Application |
20040040290 |
Kind Code |
A1 |
Crawley, Wilbur H. ; et
al. |
March 4, 2004 |
EXHAUST PROCESSOR
Abstract
An exhaust processor includes a soot filter and a filter
regenerator. The filter regenerator is configured to burn off
particulate matter collected in the soot filter to regenerate the
soot filter.
Inventors: |
Crawley, Wilbur H.;
(Columbus, IN) ; Nohl, John; (Indianapolis,
IN) |
Correspondence
Address: |
BARNES & THORNBURG
11 SOUTH MERIDIAN
INDIANAPOLIS
IN
46204
|
Family ID: |
31495412 |
Appl. No.: |
10/233222 |
Filed: |
September 3, 2002 |
Current U.S.
Class: |
60/295 ; 60/272;
60/282; 60/297; 60/311 |
Current CPC
Class: |
F01N 3/025 20130101;
F01N 3/032 20130101; Y10S 55/30 20130101; F01N 13/011 20140603 |
Class at
Publication: |
060/295 ;
060/297; 060/311; 060/272; 060/282 |
International
Class: |
F01N 003/00; F01N
001/00 |
Claims
1. An exhaust processor comprising an emission abatement device
including at least two soot filters arranged to lie in parallel
relation to one another to collect particulate matter from a flow
of unfiltered exhaust gas passed through the soot filters, each
soot filter including an inlet end configured to admit unfiltered
exhaust gas and an outlet end configured to discharge filtered
exhaust gas, an exhaust gas supplier coupled to the emission
abatement device and adapted to conduct a flow of unfiltered
exhaust gas to the emission abatement device, and a filter
regenerator coupled to the emission abatement device and configured
to supply a flow of regenerative fluid to the emission abatement
device to burn off particulate matter collected in the soot filters
included in the emission abatement device, wherein the emission
abatement device further includes a regeneration chamber associated
with the inlet end of each soot filter, each regeneration chamber
includes a flow passage, an outlet configured to discharge fluid
from the flow passage into the inlet end of the soot filter
associated with said flow passage, a filtration inlet coupled to
the exhaust gas supplier and configured to pass unfiltered exhaust
gas flowing through the exhaust gas supplier into the flow passage,
and a regeneration inlet coupled to the filter regenerator and
configured to pass regenerative fluid into the flow passage, and
wherein the filter regenerator includes a filtration inlet closer
associated with each regeneration chamber and mounted for movement
between an opened position allowing flow of unfiltered exhaust gas
into the flow passage of the regeneration chamber and a closed
position blocking flow of unfiltered exhaust gas into the flow
passage of the regeneration chamber, a regeneration inlet closer
associated with each regeneration chamber and mounted for movement
between an opened position allowing flow of regenerative fluid into
the flow passage of the regeneration chamber and a closed position
blocking flow of regenerative fluid into the flow passage of the
regeneration chamber, and a closer operator configured to move the
filtration inlet closer associated with a first of the regeneration
chambers to the opened position and the regeneration inlet closer
associated with the first of the regeneration chambers to the
closed position to allow only unfiltered exhaust gas to flow
through the soot filter associated with the first of the
regeneration chambers and configured to move the filtration inlet
closer associated with a second of the regeneration chambers to the
closed position and the regeneration inlet closer associated with
the second of the regeneration chambers to the opened position to
allow only regenerative fluid to flow through and regenerate the
soot filter associated with the second of the regeneration chambers
while unfiltered exhaust gas is flowing through and being filtered
by the soot filter associated with the first of the regeneration
chambers.
2. The exhaust processor of claim 1, wherein the emission abatement
device further includes an exhaust gas discharger adapted to be
coupled to an exhaust pipe and a housing arranged to interconnect
the exhaust gas supplier and the exhaust gas discharger, the
housing is formed to include an interior region containing the soot
filters in a downstream portion of the housing in close proximity
to the exhaust gas discharger, and the regeneration chambers are
located in an upstream portion of the interior region of the
housing in a position interposed between the exhaust gas supplier
and the soot filters.
3. The exhaust processor of claim 2, wherein the housing includes
an exterior side wall extending between the exhaust gas supplier
and the exhaust gas discharger and the exterior side wall is formed
to include the regeneration inlets associated with the regeneration
chambers.
4. The exhaust processor of claim 2, wherein the housing includes a
pipe associated with each soot filter, each soot filter is
contained in one of the pipes, each pipe interconnects the exhaust
gas supplier and the exhaust gas discharger, and each pipe includes
one of the regeneration chambers and is formed to include one of
the regeneration inlets.
5. The exhaust processor of claim 1, wherein the filter regenerator
includes an air supply, a first pipe formed to include a passage to
conduct air from the air supply to the regeneration inlet of a
first of the regeneration chambers, a first heater located in the
passage of the first pipe to heat air flowing therethrough, a
second pipe formed to include a passage to conduct air from the air
supply to the regeneration inlet of a second of the regeneration
chambers, and a second heater located in the passage of the second
pipe to heat air flowing therethrough.
6. The exhaust processor of claim 5, wherein the emission abatement
device further includes a housing containing the regeneration
chambers and soot filters, the housing includes a side wall
defining the regeneration inlets, the first pipe is coupled to the
side wall at a first of the regeneration inlets, and the second
pipe is coupled to the side wall at the second of the regeneration
inlets.
7. The exhaust processor of claim 5, wherein the regeneration inlet
closer associated with the first of the regeneration chambers is
configured to provide means for blocking a flow of air in the
passage formed in the first pipe through the regeneration inlet of
the first of the regeneration chambers and the regeneration inlet
closer associated with the second of the regeneration chambers is
configured to provide means for blocking a flow of air in the
passage formed in the second pipe through the regeneration inlet of
the second of the regeneration chambers.
8. The exhaust processor of claim 1, wherein the filter regenerator
includes a burner, an air supply configured to supply a flow of air
to the burner, an air valve configured to control the flow of air
to the burner, a fuel supply configured to supply a flow of fuel to
the burner, and a fuel valve configured to control the flow of fuel
to the burner, and the burner is configured to combust a mixture of
air from the air supply and fuel from the fuel supply to provide
the regenerative fluid.
9. The exhaust processor of claim 8, wherein the filter regenerator
includes a pipe associated with each regeneration inlet, each pipe
is formed to include a passage arranged to conduct regenerative
fluid discharged from the burner to the regeneration inlet
associated with the pipe, and each regeneration inlet closer is
associated with one of the pipes to allow a flow of regenerative
fluid from the burner through the passage formed in the one of the
pipes to the regeneration inlet associated with the one of the
pipes when the regeneration inlet closer is in its opened position
and to block a flow of regenerative fluid from the burner through
the passage formed in the one of the pipes to the regeneration
inlet associated with the one of the pipes when the regeneration
inlet closer is in its closed position.
10. The exhaust processor of claim 1, wherein the filtration inlet
closer associated with a first of the regeneration chambers
includes a valve plate supported for pivotable movement about a
pivot axis in the filtration inlet formed in the first regeneration
chamber and means for pivoting the valve plate about the pivot axis
between a closed position occluding the filtration inlet formed in
the first regeneration chamber and an opened position wherein a
first portion of the valve plate lies in a flow passage formed in
the exhaust gas supplier and a second portion of the valve plate
lies in the flow passage formed in the first regeneration chamber
to partition the filtration inlet formed in the first regeneration
chamber to provide a first flow-conducting passage through the
filtration inlet formed in the first regeneration chamber on one
side of the valve plate and also provide a second flow-conducting
passage through the filtration inlet formed in the first
regeneration chamber on an opposite side of the valve plate.
11. The exhaust processor of claim 8, wherein each valve plate has
a cross section configured as a quarter section of a circle.
12. An exhaust processor comprising an emission abatement device
including at least three soot filters arranged to collect
particulate matter from a flow of unfiltered exhaust gas passed
through the soot filters, an exhaust gas supplier coupled to the
emission abatement device and adapted to conduct a flow of
unfiltered exhaust gas to the emission abatement device, and a
filter regenerator coupled to the emission abatement device and
configured to supply a flow of regenerative fluid to each of the
soot filters to burn off particulate matter collected in the soot
filters, the filter regenerator including a detector located to
communicate with filtered exhaust gas discharged from the soot
filters and configured to detect a predetermined characteristic of
the filtered exhaust gas associated with onset of occlusion of
passages in the soot filters owing to accumulation of particulate
matter therein, a regenerative fluid supplier coupled to the
emission abatement device and configured to supply a flow of
regenerative fluid to the emission abatement device to burn off
particulate matter collected in the soot filters, an exhaust gas
flow router coupled to the exhaust gas supplier to regulate flow of
unfiltered exhaust gas to each soot filter, a regenerative fluid
flow router coupled to the regenerative fluid supplier to regulate
flow of regenerative fluid to each soot filter, and a regeneration
sequencer coupled to the detector, the exhaust gas flow router, and
the regenerative fluid flow router and configured to regenerate one
soot filter at a time in series using regenerative fluid provided
by the regenerative fluid supplier while remaining soot filters
operate to receive a flow of unfiltered exhaust gas from the
exhaust gas supplier, the regeneration sequencer being programmed
to regenerate a first of the soot filters in response to receipt of
a first regeneration activation signal generated by the detector, a
second of the soot filters in response to receipt of a second
regeneration activation signal generated by the detector, and a
third of the soot filters in response to receipt of a third
regeneration activation signal generated by the detector.
13. The exhaust processor of claim 12, wherein the regeneration
sequencer is configured to operate the exhaust gas flow router to
allow flow of unfiltered exhaust gas to all soot filters except for
one of the soot filters during the entire time that the one of the
soot filters is regenerated.
14. The exhaust processor of claim 12, wherein the exhaust gas flow
router includes an exhaust gas valve associated with each soot
filter and the regeneration sequencer is configured to cause
movement of each exhaust gas valve between an opened position
allowing flow of unfiltered exhaust gas to the associated soot
filter and a closed position blocking flow of unfiltered exhaust
gas to the associated soot filter.
15. The exhaust processor of claim 14, wherein the regenerative
fluid flow router includes a regenerative fluid valve associated
with each soot filter and the regeneration sequencer is configured
to cause movement of each regenerative fluid valve between an
opened position allowing flow of regenerative fluid to the
associated soot filter and a closed position blocking flow of
regenerative fluid to the associated soot filter.
16. The exhaust processor of claim 12, wherein the regenerative
fluid flow router includes a regenerative fluid valve associated
with each soot filter and the regeneration sequencer is configured
to cause movement of each regenerative fluid valve between an
opened position allowing flow of regenerative fluid to the
associated soot filter and a closed position blocking flow of
regenerative fluid to the associated soot filter.
17. An exhaust processor comprising an emission abatement device
including a soot filter arranged to collect particulate matter from
a flow of unfiltered exhaust gas passed through the soot filter, an
exhaust gas supplier coupled to the emission abatement device and
adapted to conduct a flow of unfiltered exhaust gas to the emission
abatement device, a filter regenerator coupled to the emission
abatement device and configured to supply a flow of regenerative
fluid to the soot filter to burn off particulate matter collected
in the soot filter, the filter regenerator including a temperature
sensor positioned to lie in thermal communication with an outlet
end of the soot filter and configured to sense an outlet
temperature associated with the outlet end, a pipe formed to
include a passage to conduct regenerative fluid to the soot filter,
a flow rate changer associated with the pipe and configured to
change the flow rate of regenerative fluid flowing therethrough to
reach the soot filter, and a temperature changer associated with
the pipe and configured to change the temperature of regenerative
fluid flowing therethrough to reach the soot filter, and a
controller coupled to each of the flow rate changer and the
temperature changer and temperature sensor and configured to
operate the flow rate changer and the temperature changer to cause
a change in at least one of the flow rate and temperature of the
regenerative fluid flowing through the pipe to reach the soot
filter in response to the outlet temperature sensed by the
temperature sensor to maintain the outlet temperature at a
regeneration temperature during regeneration of the soot
filter.
18. The exhaust processor of claim 17, wherein the filter
regenerator includes an air supply, the flow rate changer includes
a valve positioned to change the flow rate of a flow of air from
the air supply, the temperature changer includes an electric heater
positioned to change the temperature of the flow of air from the
air supply, and the controller is coupled to the valve and the
electric heater and is configured to control operation of the valve
and the electric heater in response to the outlet temperature
sensed by the temperature sensor.
19. The exhaust processor of claim 18, wherein the electric heater
is positioned in the passage.
20. The exhaust processor of claim 17, wherein the filter
regenerator includes a burner, an air supply, and a fuel supply,
the flow rate changer includes an air valve configured to control a
flow of air from the air source to the burner, the temperature
changer includes a fuel valve configured to control a flow of fuel
from the fuel source to the burner, the burner is configured to
combust a mixture of air received from the air source via the air
valve and fuel received from the fuel source via the fuel valve to
provide the regenerative fluid, and the controller is coupled to
the air valve and the fuel valve and configured to control
operation of the air valve and the fuel valve in response to the
outlet temperature sensed by the temperature sensor.
Description
BACKGROUND
[0001] The present disclosure relates to exhaust processors and
more particularly to exhaust processors including a soot filter to
collect particulate matter from a flow of exhaust gas.
[0002] The passages in a soot filter can become occluded by
particulate matter collected in the soot filter during use of the
soot filter. Occlusion of the passages of the soot filter generates
a pressure drop across the soot filter. This pressure drop may be
felt by a source of exhaust gas, such as an internal combustion
engine, as "backpressure." To reduce this backpressure, the soot
filter can be regenerated by burning off the particulate matter
collected therein.
SUMMARY
[0003] According to the present disclosure, an exhaust processor
includes an emission abatement device with some soot filters. The
soot filters are configured to collect particulate matter from
exhaust gas flowing through the emission abatement device.
[0004] The exhaust processor includes a filter regenerator
configured to supply hot regenerative fluid to burn off particulate
matter collected by the soot filters to regenerate the soot
filters. The filter regenerator includes an outlet temperature
sensor to sense an outlet temperature associated with an outlet end
of each soot filter. The exhaust processor uses the outlet
temperature in a feedback loop to control the flow rate and
temperature of the regenerative fluid during regeneration of the
soot filter associated with the temperature sensor.
[0005] The filter regenerator is configured to regenerate the soot
filters in sequence so that each soot filter takes a turn at
regeneration. Only one of the soot filters is regenerated each time
that the filter regenerator detects that the soot filters have
collected particulate matter in excess of a predetermined limit
(i.e., when a regeneration event occurs). Stated otherwise, only a
first of the soot filters is regenerated when a first regeneration
event occurs. Only a second of the soot filters is regenerated when
a second regeneration event occurs, and so on until all soot
filters have been regenerated. After they all have been
regenerated, the filter regenerator starts over with the first of
the soot filters at the next regeneration event.
[0006] Additional features and advantages of the apparatus will
become apparent to those skilled in the art upon consideration of
the following detailed description exemplifying the best mode as
presently perceived.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The detailed description particularly refers to the
accompanying figures in which:
[0008] FIG. 1 is a diagrammatic view showing exhaust gas discharged
from an exhaust gas source of a vehicle through an exhaust
processor;
[0009] FIG. 2 is a diagrammatic view of the exhaust processor of
FIG. 1 showing the exhaust processor including an emission
abatement device including a soot filter arranged to collect
particulate matter from exhaust gas discharged from the exhaust gas
source, and showing the exhaust processor including a filter
regenerator arranged to supply regenerative fluid to burn off
particulate matter collected in the soot filter and a controller
arranged to control operation of the filter regenerator in response
to a temperature of the filter sensed by a temperature sensor
included in the filter regenerator;
[0010] FIG. 3 is a perspective view of the exhaust processor of
FIG. 1;
[0011] FIG. 4 is a perspective view of the exhaust processor of
FIG. 3, with portions broken away, showing four soot filters
contained in the emission abatement device and pipes of the filter
regenerator containing heaters to heat air from an unheated air
supply to provide heated air for regeneration of associated soot
filters;
[0012] FIG. 5 is a sectional view taken along line 5-5 of FIG. 4
showing a flow of exhaust gas from the exhaust gas source routed
through a lower soot filter for collection of particulate matter
therein and a flow of air supplied by the unheated air supply and
heated by an upper, first heater routed through an upper soot
filter for regeneration of the upper soot filter and further
showing lower and upper regeneration chambers immediately upstream
from the lower and upper soot filters to receive either exhaust gas
from an associated filtration inlet or heated air from an
associated regeneration inlet (shown in dotted);
[0013] FIG. 6 is a sectional view taken along line 6-6 of FIG. 5
showing four heaters located in associated pipes spaced
circumferentially about a cylindrical exterior side wall of a
housing of the emission abatement device wherein the housing
further includes an X-shaped partition within the exterior side
wall so that the exterior side wall and the partition cooperate to
provide four regeneration chambers and showing an exhaust gas valve
associated with the upper regeneration chamber closed to block flow
of exhaust gas into the upper regeneration chamber while exhaust
gas valves associated with the other three regeneration chambers
are opened to allow flow of exhaust gas through those regeneration
chambers;
[0014] FIG. 7 is a section view taken along line 7-7 of FIG. 5
showing four outlet temperature sensors wherein each outlet
temperature sensor is associated with an outlet end of one of the
four soot filters;
[0015] FIG. 8 is a sectional view taken along line 8-8 of FIG. 6
showing, in solid lines, one of the exhaust gas valves in its
closed position and showing, in dotted lines, the exhaust gas valve
in its opened position;
[0016] FIG. 9 is a sectional view taken along line 9-9 of FIG. 4
showing one of the heaters located in a passage formed in one of
the pipes of the filter regenerator to conduct a flow of unheated
air from the unheated air supply to a regeneration inlet associated
with one of the regeneration chambers for regeneration of one of
the soot filters;
[0017] FIG. 10 is a diagrammatic view showing a controller of the
exhaust processor and its relation to various components;
[0018] FIG. 11 is an elevation view, with portions broken away, of
another exhaust processor;
[0019] FIG. 12 is a sectional view taken along line 12-12 of FIG.
11;
[0020] FIG. 13 is an elevation view, with portions broken away, of
another exhaust processor showing the exhaust processor including a
fuel-fired burner unit to supply regenerative fluid for
regeneration of soot filters of the exhaust processor; and
[0021] FIG. 14 is a diagrammatic view showing a controller of the
exhaust processor of FIG. 13 and its relation to various
components.
DETAILED DESCRIPTION OF DRAWINGS
[0022] An exhaust processor 10 is arranged to process a flow of
exhaust gas discharged from an exhaust gas source 12, as shown in
FIG. 1. Exhaust gas source 12 is, for example, an internal
combustion engine, such as a diesel engine, of a vehicle 14.
Exhaust processor 10 is configured to collect particulate matter
present in the exhaust gas as the exhaust gas flows through exhaust
processor 10 to prevent the collected particulate matter from being
discharged into the surrounding atmosphere.
[0023] Referring now to the diagrammatic view of FIG. 2, exhaust
processor 10 includes an exhaust gas supplier 16, an emission
abatement device 18, and an exhaust gas discharger 20. Exhaust gas
supplier 16 is arranged to receive a flow of unfiltered exhaust gas
from exhaust gas source 12 and to conduct the flow of unfiltered
exhaust gas to emission abatement device 18. Emission abatement
device 18 includes a soot filter 22 arranged to collect particulate
matter present in the flow of unfiltered exhaust gas as the flow of
unfiltered exhaust gas passes through passages formed in soot
filter 22. A flow of filtered exhaust gas exits from soot filter 22
and passes to exhaust gas discharger 20 which discharges the
filtered exhaust gas from exhaust processor 10.
[0024] Exhaust processor 10 includes a filter regenerator 27
coupled to emission abatement device 18. Filter regenerator 27 is
configured to supply a flow of regenerative fluid to emission
abatement device 18 to burn off particulate matter collected in
soot filter 22 (i.e., regenerate soot filter 22).
[0025] Filter regenerator 27 includes a detector 26, a temperature
sensor 34, a flow rate changer 36, and a temperature changer 38.
Detector 26 is arranged to detect when the passages formed in soot
filter 22 have become occluded or clogged by particulate matter in
excess of an occlusion or clogging limit. Temperature sensor 34 is
arranged in thermal communication with soot filter 22 to sense a
filter temperature associated with soot filter 22 during
regeneration of soot filter 22. Flow rate changer 36 is arranged to
change the flow rate of a flow of regenerative fluid to soot filter
22. Temperature changer 38 is arranged to change the temperature of
the flow of regenerative fluid to soot filter 22.
[0026] Exhaust processor 10 includes a controller 28 coupled to
filter regenerator 27 to control operation thereof to provide
controlled regeneration of soot filter 22. Controller 28 includes a
processor 30 and a memory 32 electrically coupled to processor 30.
Memory 32 has a plurality of instructions stored therein for
execution by processor 30.
[0027] Controller 28 is electrically coupled to detector 26,
temperature sensor 34, flow rate changer 36, and temperature
changer 38. Controller 28 is arranged to cause filter regenerator
27 to supply regenerative fluid to soot filter 22 when detector 26
detects the clogging limit. Controller 28 is arranged to receive
the filter temperature sensed by temperature sensor 34 and is
arranged to operate flow rate changer 36 and temperature changer 38
in response to the filter temperature sensed by the temperature
sensor 34 to change the flow rate and temperature of the flow of
regenerative fluid to soot filter 22 as needed to maintain the
filter temperature at a regeneration temperature during
regeneration of soot filter 22. The regeneration temperature is,
for example, 605.degree. Celsius plus or minus a tolerance, such as
5.degree. Celsius.
[0028] Controller 28 thus provides control means for controlling
operation of flow rate changer 36 and temperature changer 38 to
change the flow rate and the regenerative fluid temperature in
response to the filter temperature sensed by temperature sensor 34.
Using controller 28, flow rate changer 36 and temperature changer
38 are operated to maintain the filter temperature at the
regeneration temperature during regeneration of soot filter 22.
[0029] Details of exhaust processor 10 are shown in FIGS. 3-10. For
example, exhaust gas supplier 16 takes the form of an inlet cone as
shown in FIGS. 3-6 and exhaust gas discharger 20 takes the form of
an outlet cone as shown in FIGS. 3-5. A guard 40 surrounds emission
abatement device 18 and other portions of exhaust processor 10, as
shown in FIGS. 3-7, to block dirt and other external substances
from collecting on external surfaces of exhaust processor 10.
[0030] Emission abatement device 18 includes a housing 42 that
interconnects exhaust gas supplier 16 and exhaust gas discharger
20, as shown in FIGS. 4 and 5. Housing 42 includes an exterior
cylindrical side wall 44 extending between exhaust gas supplier 16
and exhaust gas discharger 20 and an interior partition 46 that
divides an interior region 48 formed by side wall 44 into four
smaller interior regions 50a, 50b, 50c, 50d, as shown in FIGS. 6
and 7. Partition 46 is X-shaped, as shown in FIG. 7, and is fixed
to side wall 44.
[0031] Exhaust processor 10 includes four soot filters 22a, 22b,
22c, 22d. Each soot filter 22a, 22b, 22c, 22d is positioned in a
downstream portion of one of interior regions 50a, 50b, 50c, 50d,
as suggested in FIGS. 5 and 7. Each soot filter 22a, 22b, 22c, 22d
includes an outlet end 51 positioned in close proximity to exhaust
gas discharger 20 and has a cross section configured as a quarter
section of a circle.
[0032] Emission abatement device 18 includes four regeneration
chambers 52a, 52b, 52c, 52d located in an upstream portion of
interior region 48. Side wall 44 and partition 46 cooperate to
provide each regeneration chamber 52a, 52b, 52c, 52d. Each
regeneration chamber 52a, 52b, 52c, 52d is formed to include an
upstream portion of each smaller interior region 50a, 50b, 50c, 50d
and is associated with an inlet end 53 of one of soot filters 22a,
22b, 22c, 22d.
[0033] Each regeneration chamber 52a, 52b, 52c, 52d includes a flow
passage 54, a filtration inlet 56, a regeneration inlet 58, and an
outlet 60. Each filtration inlet 56 is coupled exhaust gas supplier
16 and configured to pass unfiltered exhaust gas flowing through
exhaust gas supplier 16 into flow passage 54. Each regenerative
fluid inlet 56 is configured to pass regenerative fluid into flow
passage 54. Each outlet 60 is configured to discharge fluid from
flow passage 54 into one of the inlet ends 53.
[0034] Filter regenerator 27 includes an exhaust gas router 62
arranged to control flow of exhaust gas through filtration inlets
56, as shown in FIG. 10. Exhaust gas router 62 includes a
filtration inlet closer, such as an exhaust gas valve 64a, 64b,
64c, 64d, associated with each filtration inlet 56, as shown in
FIGS. 5 and 6. Exhaust gas router 62 further includes an exhaust
gas valve actuator 66a, 66b, 66c, 66d associated with each exhaust
gas valve 64a, 64b, 64c, 64d, as shown in FIGS. 4-6. Exhaust gas
valve actuators 66a, 66b, 66c, 66d cooperate to provide a
filtration inlet closer operator.
[0035] Each exhaust gas valve actuator 66a, 66b, 66c, 66d is
coupled to one of exhaust gas valves 64a, 64b, 64c, 64d for
pivotable movement of the exhaust gas valve 64a, 64b, 64c, 64d in
one of filtration inlets 56 between an opened position allowing a
flow of exhaust gas from a flow passage 68 formed in exhaust gas
supplier 16 to flow passage 54 of one of regeneration chambers 52a,
52b, 52c, 52d and a closed position blocking a flow of exhaust gas
from flow passage 68 to flow passage 54.
[0036] Each exhaust gas valve 64a, 64b, 64c, 64d includes a valve
plate and a pair of fasteners that attach the valve plate to a
pivot shaft 70 of the exhaust gas valve actuator 66a, 66b, 66c, 66d
associated with the exhaust gas valve 64a, 64b, 64c, 64d. A first
portion of the valve plate lies in flow passage 68 and a second
portion of the valve plate lies in flow passage 54 of the
regeneration chamber 52a, 52b, 52c, 52d associated with the valve
plate when the valve plate is opened to provide a first
flow-conducting passage 69 through the filtration inlet 56 on one
side of the valve plate and a second flow-conducting passage 71
through the filtration inlet 56 on an opposite side of the valve
plate, as shown in FIG. 8. Each valve plate has a cross-section
configured as a quarter section of a circle.
[0037] Each pivot shaft 70 establishes a pivot axis 72 about which
the valve plate is pivoted between the opened and closed positions,
as shown in FIG. 5 with respect to exhaust gas valve actuators 66a,
66c. A pivot arm 74 of each exhaust gas valve actuator 66a, 66b,
66c, 66d extends perpendicularly to each pivot shaft 70 to pivot
the pivot shaft 70 about its pivot axis 72. Each exhaust gas valve
actuator 66a, 66b, 66c, 66d includes an arm operator (not shown) to
operate one of pivot arms 74. An example of such an arm operator
includes a fluid-actuated piston extensible from a cylinder. The
fluid for actuating the piston is supplied, for example, by the
vacuum created by the engine of vehicle 14. Each exhaust gas valve
actuator 66a, 66b, 66c, 66d provides means for pivoting the exhaust
gas valve 64a, 64b, 64c, 64d associated therewith between the
opened and closed positions.
[0038] Filter regenerator 27 includes pipes 76a, 76b, 76c, 76d (see
FIGS. 3-7 and 9), temperature changers that take the form of
electric heaters 38a, 38b, 38c, 38d (see FIGS. 4-6, 9, and 10),
regeneration inlet closers 80a, 80b, 80c, 80d (see FIGS. 3-5, and
10), a regeneration inlet closer operator, and an unheated air
supply 84 (see FIGS. 3-5, 9, and 10). Regeneration inlet closers
80a, 80b, 80c, 80d take the form of air valves 80a, 80b, 80c, 80d
and regeneration inlet closer operator includes air valve actuators
82a, 82b, 82c, 82d (see FIGS. 3-5, 9, and 10). The regeneration
inlet closer operator and the filtration inlet closer operator
cooperate to provide a closer operator. Air valves 80a, 80b, 80c,
80d and air valve actuators 82a, 82b, 82c, 82d cooperate to provide
a regenerative fluid flow router 83. Regenerative fluid flow router
83 and exhaust gas flow router 62 cooperate to provide a flow
router 85 arranged to regulate flow of regenerative fluid and
exhaust gas through soot filters 22a, 22b, 22c, 22d, as shown in
FIG. 10.
[0039] Each pipe 76a, 76b, 76c, 76d is coupled to exterior side
wall 44 at one of regeneration inlets 58 and is formed to include a
passage 86 in which one of electric heaters 38a, 38b, 38c, 38d is
positioned to heat a flow of air from unheated air supply 84 to
provide a flow of heated air to regenerate one of the soot filters
22a, 22b, 22c, 22d. Each air valve 80a, 80b, 80c, 80d is fluidly
interposed between unheated air supply 84 and one of electric
heaters 38a, 38b, 38c, 38d and each air valve actuator 82a, 82b,
82c, 82d is coupled to one of air valves 80a, 80b, 80c, 80d to
operate the air valve 80a, 80b, 80c, 80d to control a flow rate of
the flow of unheated air from unheated air supply 84 through the
passage 86 containing the electric heater 38a, 38b, 38c, 38d. Air
valves 80a, 80b, 80c, 80d and air valve actuators thus cooperate to
provide flow rate changers 36a, 36b, 36c, 36d (see FIG. 10). Each
air valve 80a, 80b, 80c, 80d thus provides means for blocking a
flow of air in one of the passages 86 through one of the
regeneration inlets 58.
[0040] Unheated air supply 84 is, for example, an air pump
dedicated to provide a flow of unheated air for regeneration of
soot filters 22a, 22b, 22c, 22d. In other embodiments, unheated air
supply 84 is, for example, a pneumatic line attached to one or air
brake lines of vehicle 14.
[0041] Detector 26 of filter regenerator 27 includes an inlet
pressure sensor 88 and an outlet pressure sensor 90, as shown in
FIGS. 5 and 10. Inlet pressure sensor 88 extends within exhaust gas
supplier 16 and outlet pressure sensor 90 extends within exhaust
gas discharger 20. Inlet and outlet pressure sensors 88, 90 provide
pressure information to controller 28 which determines the pressure
drop across soot filters 22a, 22b, 22c, 22d. The controller 28 can
determine whether soot filters 22a, 22b, 22c, 22d have, as a unit,
reached their clogging limit based on the pressure drop across soot
filters 22a, 22b, 22c, 22d and other controller inputs such as the
engine speed 89 measured in revolutions per minute or rpm's, the
engine torque 94, the turbocharger rpm's 91 of a turbocharger (not
shown) associated with the engine, the turbo boost pressure 96 of
the turbocharger, and the position 98 of the throttle (not shown)
of vehicle 14, as shown in FIG. 10.
[0042] Filter regenerator 27 includes inlet temperature sensors
92a, 92b, 92c, 92d, as shown in FIGS. 5 and 10. Each inlet
temperature sensor 92a, 92b, 92c, 92d is positioned in in close
proximity to one of the inlet ends 53 to sense an inlet temperature
of a flow of heated air entering the inlet end 53 and provides the
inlet temperature to controller 28. Controller 28 uses the inlet
temperature to determine whether filter regenerator 27 is supplying
the flow of heated air to the soot filter 22a, 22b, 22c, 22d.
[0043] Filter regenerator 27 includes outlet temperature sensors
34a, 34b, 34c, 34d, as shown in FIGS. 5, 7, and 10. Each outlet
temperature sensor 34a, 34b, 34c, 34d is positioned in thermal
communication with one of outlet ends 51 to sense an outlet
temperature associated with the outlet end 51 and provides the
outlet temperature to controller 28. Controller 28 uses the outlet
temperature to control regeneration of soot filters 22a, 22b, 22c,
22d.
[0044] When controller 28 determines that the clogging limit of
soot filters 22a, 22b, 22c, 22d has been exceeded based on
information from pressure sensors 88, 90, controller 28 selects one
of soot filters 22a, 22b, 22c, 22d for regeneration. For purposes
of illustration, it is assumed that soot filter 22a is selected for
regeneration. In this case, controller 28 causes exhaust gas valve
actuator 66a to move exhaust gas valve 64a to its closed position
to block exhaust gas from flowing through filtration inlet 56
associated with soot filter 22a into regeneration chamber 52a and
through soot filter 22a. At the same time, the other exhaust gas
valves 64b, 64c, 64d remain in their opened positions to allow
exhaust gas to flow the filtration inlets 56 associated with soot
filters 22b, 22c, 22d into regeneration chambers 52b, 52c, 52d and
through soot filters 22b, 22c, 22d so that exhaust gas continues to
be filtered during regeneration of soot filter 22a.
[0045] Controller 28 operates unheated air supply 84 to provide a
flow of unheated air for regeneration of soot filter 22a.
Controller 28 operates air valve actuator 82ato open air valve 80a
to allow a flow of air from supply 84 into passage 86 of pipe 76a
while air valve actuators 82b, 82c, 82d maintain air valves 80b,
80c, 80d in their closed positions to block a flow of air from
supply 84 into passages 86 of pipes 76b, 76c, 76d. Controller 28
further operates electric heater 38a via an electrical line 96 (see
FIG. 5) to heat air flowing from supply 84 past air valve 80a
through passage 86, regeneration inlet 58, regeneration chamber
52a, and soot filter 22a.
[0046] Controller 28 operates air valve actuator 82a and electric
heater 38a in response to the outlet temperature sensed by outlet
temperature sensor 34a. During regeneration of soot filter 22a,
controller is programmed to operate air valve actuator 82a and
electric heater 38a as needed to maintain the outlet temperature at
the regeneration temperature. Controller 28 can operate air valve
actuator 82a to increase or decrease the flow rate of the heated
air flowing through soot filter 22a. In addition, controller 28 can
operate electric heater 38a to increase or decrease the temperature
of the heated air. For example, if the outlet temperature is too
high (i.e., above the tolerance of the regeneration temperature) or
too low (i.e., below the tolerance of the regeneration
temperature), controller 28 can decrease or increase the heat
output of electric heater 38a. In addition, if more or less oxygen
is needed to maintain the outlet temperature at the regeneration
temperature, controller 28 can operate air valve actuator 82a to
move air valve 80a more toward its fully opened or fully closed
positions.
[0047] After regeneration of soot filter 22a is completed,
controller 28 causes exhaust gas valve 64a to be re-opened and air
valve 80a to be re-closed to allow exhaust gas to flow through all
soot filters 22a, 22b, 22c, 22d once again. In addition, controller
28 turns off electric heater 38a and unheated air supply 84 (if
supply 84 is a separately dedicated air pump).
[0048] When controller 28 determines that the pressure drop across
emission abatement device 120 has exceeded the clogging limit
again, soot filter 22b is regenerated. This process is repeated
until all soot filters 22a, 22b, 22c, 22d have been regenerated to
complete one regeneration cycle. After all soot filters 22a, 22b,
22c, 22d have been regenerated, the regeneration cycle starts over
with soot filter 22a. Thus, controller 28 and filter regenerator 27
provide means for sequentially regenerating soot filters 22a, 22b,
22c, 22d wherein only one of soot filters 22a, 22b, 22c, 22d is
regenerated to reduce particulate matter collected in the soot
filters 22a, 22b, 22c, 22d below a clogging limit each time the
particulate matter collected in the soot filters 22a, 22b, 22c, 22d
exceeds the clogging limit.
[0049] An exhaust processor 110 is shown in FIGS. 11 and 12.
Exhaust processor 110 is similar in structure and function to
exhaust processor 10, except as otherwise noted, so that identical
reference numerals refer to similar structures. Exhaust processor
110 includes filter regenerator 27, controller 28, an exhaust gas
supplier 116, an emission abatement device 118, and an exhaust gas
discharger 120.
[0050] Exhaust gas supplier 116 includes an inlet pipe 117 and four
inlet transition pipes 119a, 119b, 119c, 119d, as shown in FIGS. 11
and 12. Inlet pipe 117 receives exhaust gas from exhaust gas source
12. Each inlet transition pipe 119a, 119b, 119c, 119d is formed to
include a flow passage 168 that receives a flow of exhaust gas from
inlet pipe 117 and conducts the flow of exhaust gas to emission
abatement device 18. Inlet pressure sensor 88 extends into inlet
pipe 117.
[0051] Exhaust gas discharger 120 includes four outlet transition
pipes 121 and an outlet pipe 123, as shown in FIG. 11. Outlet
transition pipes 121 receive a flow of exhaust gas from emission
abatement device 118 and conduct the flow of exhaust gas to outlet
pipe 123. Outlet pipe 123 discharges the flow of exhaust gas from
exhaust processor. Outlet pressure sensor extends into outlet pipe
123.
[0052] Emission abatement device 118 includes a housing 142, as
shown in FIGS. 11 and 12. Housing 142 includes four housing pipes
143a, 143b, 143c, 143d. Each housing pipe 143a, 143b, 143d, 143d
interconnects one of inlet transition pipes 119a, 119b, 119c, 119d
and one of outlet transition pipes 121 and is formed to include an
interior region 150a, 150b, 150c, 150d, as shown in FIG. 12, which
cooperate to provide an overall interior region formed in housing
142.
[0053] Emission abatement device 118 includes four soot filters
122a, 122b, 122c, 122d to collect particulate matter present in
exhaust gas flowing through soot filters 122a, 122b, 122c, 122d.
Each soot filter 122a, 122b, 122c, 122d is positioned in a
downstream portion of one of interior regions 150a, 150b, 150c,
150d and has a circular cross-section. An outlet end 151 of each
soot filter 122a, 122b, 122c, 122d is positioned in close proximity
to one of outlet transition pipes 121.
[0054] Each housing pipe 143a, 143b, 143c, 143d includes a
regeneration chamber 152a, 152b, 152c, 152d formed to include an
upstream portion of one of interior regions 150a, 150b, 150c, 150,
as shown in FIGS. 11 and 12. Each regeneration chamber 152a, 152b,
152c, 152d is formed to include a filtration inlet 156, a
regeneration inlet 158, and a flow passage 154 to conduct a flow of
fluid (i.e., exhaust gas or regenerative fluid such as heated air)
from filtration inlet 156 or regeneration inlet 158 to an inlet end
153 of one of soot filters 122a, 122b, 122c, 122d.
[0055] Filter regenerator 27 includes four filtration inlet closers
that take the form of four exhaust gas valves 164a, 164b, 164c,
164d (see FIGS. 11 and 12) which are similar to exhaust gas valves
64a, 64b, 64c, 64d except that the valve plate of each valve 164a,
164b, 164c, 164d has a circular cross-section instead of a
quarter-circle cross-section. Thus, the function of exhaust gas
valves 164a, 164b, 164c, 164d is the same as the function of
exhaust gas valves 64a, 64b, 64c, 64d. Each exhaust gas valve 164a,
164b, 164c, 164d is located in one of housing pipes 143a, 143b,
143c, 143d between one of inlet transition pipes 119a, 119b, 119c,
119d and one of regeneration chambers 152a, 152b, 152c, 152d, as
shown in FIG. 11 to control flow of exhaust gas through one of
filtration inlets 156. Exhaust gas valves 164a, 164b, 164c, 164d
and exhaust gas valve actuators 66a, 66b, 66c, 66d associated
therewith cooperate to provide exhaust gas flow router 62 of
exhaust processor 110.
[0056] Each pipe 76a, 76b, 76c, 76d of filter regenerator 27 is
coupled to one of housing pipes 143a, 143b, 143c, 143d at one of
regeneration inlets 158, as suggested in FIG. 12. Each pipe 76a,
76b, 76c, 76d contains one of electric heaters 38a, 38b, 38c, 38d
in passage 86 formed therein and is operated by controller 28 via
one of electrical lines 96. One of air valves 80a, 80b, 80c, 80d
and one of air valve actuators 82a, 82b, 82c, 82d is associated
with each pipe 76a, 76b, 76c, 76d to control flow of air from
unheated air supply 84 to one of passages 86.
[0057] Each of inlet temperature sensors 92a, 92b, 92c, 92d and
outlet temperature sensors 34a, 34b, 34c, 34d extends into one of
interior regions 150a, 150b, 150c, 150d. Each inlet temperature
sensor 92a, 92b, 92c, 92d is positioned in close proximity to one
of inlet ends 153. Each outlet temperature sensor 34a, 34b, 34c,
34d is positioned in close proximity and in thermal communication
with one of outlet ends 151 to sense an outlet temperature
associated with the outlet end 151.
[0058] An exhaust processor 210 is shown in FIGS. 13 and 14.
Exhaust processor 210 is similar in structure and function to
exhaust processor 110, except as otherwise noted, so that identical
reference numerals refer to similar structures. Exhaust processor
210 includes a filter regenerator 227 that uses a fuel-fired burner
unit 294 to supply regenerative fluid for regeneration of soot
filters 122a, 122b, 122c, 122d.
[0059] Filter regenerator 227 includes four pipes 76a, 76b, 76c,
76d, as shown in FIG. 13. Each pipe 76a, 76b, 76c, 76d is formed to
include a flow passage 86 to conduct regenerative fluid from
fuel-fired burner unit 294 to one of regeneration inlets 156.
[0060] Filter regenerator 227 includes a regenerative fluid flow
router 283 coupled to pipes 76a, 76b, 76c, 76d to control which of
pipes 76a, 76b, 76c, 76d receives regenerative fluid from
fuel-fired burner unit 294, as shown in FIGS. 13 and 14.
Regenerative fluid flow router 283 includes four valves 280a, 280b,
280c, 280d and four valve actuators 282a, 282b, 282c, 282d. Each
valve actuator 282a, 282b, 282c, 282d is coupled to one of valves
280a, 280b, 280c, 280d for movement thereof between an opened
position allowing flow of regenerative fluid from fuel-fired burner
unit 294 and one of passages 86 to one of regeneration inlets 158
and a closed position blocking flow of regenerative fluid from
fuel-fired burner unit 294 and one of passages 86 to one of
regeneration inlets 158. Thus, each valve 280a, 280b, 280c, 280d
can be referred to as a regeneration inlet closer and each valve
actuator 282a, 282b, 282c, 282d can be referred to as a
regeneration inlet closer operator. The regeneration inlet closer
operator and the filtration inlet closer operator (i.e., exhaust
gas valve actuators 66a, 66b, 66c, 66d) cooperate to provide a
closer operator.
[0061] Valves 280a, 280b, 280c, 280d and valve actuators 282a,
282b, 282c, 282d cooperate to provide a regenerative fluid flow
router 283. Regenerative fluid flow router 283 and exhaust gas flow
router 62 cooperate to provide a flow router 285 configured to
regulate flow of regenerative fluid and exhaust gas to regeneration
chambers 152a, 152b, 152c, 152d and soot filters 122a, 122b, 122c,
122d.
[0062] Fuel-fired burner unit 294 includes a burner 295, an
unheated air supply 296, an air valve 297, an air valve actuator
298, a fuel supply 299, a fuel valve 300, and a fuel valve actuator
301. Burner 295 includes an igniter (not shown) to combust a
mixture of air from air supply 296 and fuel from fuel supply 299 to
provide regenerative fluid.
[0063] Air valve 297 is fluidly interposed between air supply 296
and burner 295. Air valve actuator 298 is coupled to air valve 297
for movement thereof to control the flow rate of the flow of air
from air supply 296 to burner 295. Air valve 297 and air valve
actuator 298 cooperate to provide a flow rate changer 236.
[0064] Fuel valve 300 is fluidly interposed between fuel supply 299
and burner 295. Fuel valve actuator 301 is coupled to fuel valve
300 for movement thereof to control the flow rate of the flow of
fuel from fuel supply 299 to burner 295. Fuel valve 300 and fuel
valve actuator 301 cooperate to provide a temperature changer
238.
[0065] Operation of flow rate changer 236 and temperature changer
238 controls the air-fuel ratio and flow rate of the mixture of air
and fuel admitted into burner 295. Operation of flow rate changer
236 and temperature changer 238 thus controls the flow rate and
temperature of the regenerative fluid.
[0066] Exhaust processor 210 includes a controller 228, as shown in
FIG. 14. Controller is configured to control operation of exhaust
processor 210. The controller 228 can determine whether soot
filters 122a, 122b, 122c, 122d have, as a unit, reached their
clogging limit based on controller inputs from inlet and outlet
pressure sensors 88, 90 that indicate the pressure drop across soot
filters 122a, 122b, 122c, 122d and other controller inputs such as
the engine rpm's 89, the engine torque 94, the turbocharger rpm's
91, the turbo boost pressure 96, and the throttle position 98, as
shown in FIG. 14.
[0067] If controller 228 determines the clogging limit has been
exceeded, controller 228 causes filter regenerator 227 to
regenerate only one of soot filters 122a, 122b, 122c, 122d. For
purposes of explanation, it is assumed that soot filter 122a is
selected for regeneration.
[0068] To regenerate soot filter 122a, controller 228 causes
exhaust gas valve actuator 66a to close exhaust gas valve 164a to
block exhaust gas from flowing into regeneration chamber 152a and
through soot filter 122a and causes exhaust gas valve actuators
66b, 66c, 66d to open exhaust gas valves 164b, 164c, 164d to allow
exhaust gas to flow into regeneration chambers 152b, 152c, 152d and
soot filters 122b, 122c, 122d. Controller 228 causes valve actuator
282a to open valve 280a allowing a flow of regenerative fluid from
burner 295 into regeneration chamber 152a and through soot filter
122a and causes valve actuators 282b, 282c, 282d to close valves
280b, 280c, 280d blocking a flow of regenerative fluid from burner
295 into regeneration chambers 152b, 152c, 152d.
[0069] Controller 228 further operates fuel-fired burner unit 294.
Controller 228 operates unheated air supply 296 and fuel supply 299
to provide a flow of air and fuel via air valve 297 and fuel valve
300 to burner 295. Controller 228 causes air valve actuator 298 and
fuel valve actuator 301 to move air valve 297 and fuel valve 300 to
control the flow rates of the flow of air and fuel to burner 295.
Controller 228 causes the igniter of burner 295 to operate in a
constant manner during regeneration of soot filter 122a to combust
the air-fuel mixture in burner 295.
[0070] Controller 228 receives an inlet temperature from inlet
temperature sensor 92a. Controller 228 uses the inlet temperature
sensed by inlet temperature sensor 92a to determine whether filter
regenerator 227 is providing regenerative fluid to soot filter
122a.
[0071] Controller 228 receives an outlet temperature from outlet
temperature sensor 34a. Controller 228 uses the outlet temperature
sensed by outlet temperature sensor 34a in a feedback loop to
change the flow rate and temperature of a flow of regenerative
fluid to soot filter 122a as needed to maintain the outlet
temperature at the regeneration temperature during regeneration of
soot filter 122a. To change the flow rate of the flow of
regenerative fluid, controller 228 operates air valve actuator 298
of flow rate changer 236. To change the temperature of the flow of
regenerative fluid, controller 228 operates fuel valve actuator 301
of temperature changer 238. Thus, controller 228 provides control
means for controlling operation of flow rate changer 236 and
temperature changer 238 to change the flow rate and the
regenerative fluid temperature in response to the outlet
temperature sensed by temperature sensor 34a to maintain the outlet
temperature at the regeneration temperature during regeneration of
soot filter 122a.
[0072] When controller 228 determines that the particulate matter
has been reduced below the clogging limit, controller 228 ceases
operation of filter regenerator 227. The igniter of burner 295 is
turned off and valve actuator 282a closes valve 280a. Controller
228 also shuts down any air and fuel pumps dedicated to burner unit
294. Controller 228 further causes exhaust gas valve actuator 66a
to open exhaust gas valve 164a to allow exhaust gas to flow through
soot filter 122a again.
[0073] When controller 228 determines that the clogging limit has
been exceeded again, soot filter 122b is regenerated. This process
is repeated until all soot filters 122a, 122b, 122c, 122d have been
regenerated to complete one regeneration cycle. After all soot
filters 122a, 122b, 122c, 122d have been regenerated, the
regeneration cycle starts over with soot filter 122a. Thus,
controller 228 and filter regenerator 227 provide means for
sequentially regenerating soot filters 122a, 122b, 122c, 122d
wherein only one of soot filters 122a, 122b, 122c, 122d is
regenerated to reduce particulate matter collected in the soot
filters 122a, 122b, 122c, 122d below the clogging limit each time
the particulate matter collected in the soot filters 122a, 122b,
122c, 122d exceeds the clogging limit.
* * * * *