U.S. patent application number 14/626345 was filed with the patent office on 2016-02-04 for method and system of maintaining dpf regeneration for improving durability of dpf filter.
This patent application is currently assigned to Hyundai Motor Company. The applicant listed for this patent is Hyundai Motor Company, Kia Motors Corp.. Invention is credited to Je Rok CHUN, Won Jin Jo, Chung Gyu KIM, Seok Dong KIM, Young Jic KIM, Jae Yeon LEE, Bong Kyoo PARK, Byeong Kyu YOON.
Application Number | 20160032799 14/626345 |
Document ID | / |
Family ID | 54873005 |
Filed Date | 2016-02-04 |
United States Patent
Application |
20160032799 |
Kind Code |
A1 |
Jo; Won Jin ; et
al. |
February 4, 2016 |
METHOD AND SYSTEM OF MAINTAINING DPF REGENERATION FOR IMPROVING
DURABILITY OF DPF FILTER
Abstract
A method of maintaining diesel particulate filter (DPF)
regeneration for improving durability of a DPF, may include
determining, by a controller, whether a vehicle enters an idle
state during the DPF regeneration, controlling, by the controller,
a concentration of oxygen introduced into the DPF to be equal to or
less than a first reference value when the vehicle enters the idle
state, and performing, by the controller, a regeneration process
until a soot mass in the DPF may be equal to or less than a target
reference value.
Inventors: |
Jo; Won Jin; (Hwaseong-si,
KR) ; KIM; Chung Gyu; (Gunpo-si, KR) ; KIM;
Seok Dong; (Gunpo-si, KR) ; CHUN; Je Rok;
(Hwaseong-si, KR) ; LEE; Jae Yeon; (Seoul, KR)
; YOON; Byeong Kyu; (Suwon-si, KR) ; PARK; Bong
Kyoo; (Gwangmyeong-si, KR) ; KIM; Young Jic;
(Hwaseong-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hyundai Motor Company
Kia Motors Corp. |
Seoul
Seoul |
|
KR
KR |
|
|
Assignee: |
Hyundai Motor Company
Seoul
KR
Kia Motors Corp.
Seoul
KR
|
Family ID: |
54873005 |
Appl. No.: |
14/626345 |
Filed: |
February 19, 2015 |
Current U.S.
Class: |
60/274 ;
60/295 |
Current CPC
Class: |
F01N 3/023 20130101;
F02D 41/029 20130101; F02D 41/08 20130101; F02D 2200/0802
20130101 |
International
Class: |
F01N 3/023 20060101
F01N003/023 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 4, 2014 |
KR |
10-2014-0099728 |
Claims
1. A method of maintaining diesel particulate filter (DPF)
regeneration for improving durability of a DPF, comprising:
determining, by a controller, whether a vehicle enters an idle
state during the DPF regeneration; controlling, by the controller,
a concentration of oxygen introduced into the DPF to be equal to or
less than a first reference value when the vehicle enters the idle
state; and performing, by the controller, a regeneration process
until a soot mass in the DPF is equal to or less than a target
reference value.
2. The method of claim 1, further comprising: after the determining
whether the vehicle enters the idle state during the DPF
generation, comparing, by the controller, the soot mass in the DPF
with a preset soot reference value when the vehicle enters the idle
state.
3. The method of claim 2, further comprising: in the comparing of
the soot mass in the DPF with the preset soot reference value when
the vehicle enters the idle state, when the soot mass in the DPF is
equal to or more than the preset soot reference value, controlling,
by the controller, the concentration of the oxygen introduced into
the DPF to be equal to or less than the first reference value, and
when the soot mass in the DPF is less than the preset soot
reference value, controlling, by the controller, the concentration
of the oxygen introduced into the DPF to be equal to or less than a
second reference value larger than the first reference value.
4. The method of claim 3, wherein the concentration of the oxygen
introduced into the DPF is controlled by using a shutoff valve
installed in front of an engine.
5. A system of maintaining DPF regeneration for improving
durability of a diesel particulate filter (DPF), comprising: the
DPF capturing a soot captured in exhaust gas; and a controller
receiving a signal about whether a vehicle is currently in an idle
state to maintain the DPF regeneration in the idle state of the
vehicle until a soot mass in the DPF reaches a target reference
value to prevent the DPF from arriving at a limit temperature and a
limit temperature gradient.
6. The system of claim 5, wherein the controller receives the
signal about whether the vehicle is currently in the idle state and
controls a concentration of oxygen introduced into the DPF to be
equal to or less than a first reference value to maintain the DPF
regeneration until the soot mass in the DPF reaches the target
reference value.
7. The system of claim 6, wherein the controller receives the
signal about whether the vehicle is currently in the idle state and
then determines whether the soot mass in the DPF is equal to or
more than a preset soot reference value.
8. The system of claim 7, wherein the controller controls the
concentration of the oxygen introduced into the DPF to be equal to
or less than the first reference value when the soot mass in the
DPF is equal to or more than the preset soot reference value, and
when the soot mass in the DPF is less than the preset soot
reference value, controlling, by the controller, the concentration
of the oxygen introduced into the DPF to be equal to or less than a
second reference value larger than the first reference value to
maintain the DPF regeneration until the soot mass in the DPF
reaches the target reference value.
9. The system of claim 5, wherein the controller transfers a signal
to a shutoff valve installed in front of an engine to control a
concentration of oxygen introduced into the DPF.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority to Korean Patent
Application Number 10-2014-0099728 filed Aug. 4, 2014, the entire
contents of which is incorporated herein for all purposes by this
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a method and a system of
maintaining diesel particulate filter (DPF) regeneration for
improving durability of a DPF filter, and more particularly, to a
method and a system of maintaining DPF regeneration for improving
durability of a DPF filter by maintaining the DPF regeneration
until a soot mass in the DPF is equal to or less than a set target
reference value even when a vehicle enters an idle state while the
vehicle is driven.
[0004] 2. Description of Related Art
[0005] Exhaust gas emitted from an engine is induced into and
purified by a catalytic converter which is disposed in the middle
of an exhaust pipe and emitted into the air through a tail exhaust
pipe after noise is reduced while passing through a muffler.
[0006] Meanwhile, the exhaust gas emitted from the engine needs to
meet OBD regulations which define a regulation of exhaust gas and
several regulations associated with standardization in a diagnosis
and after service (A/S) market detecting a failure and a
deterioration of exhaust related parts.
[0007] Therefore, to meet North America Diesel Tier2 BIN5
regulation or Euro 6 regulation, a diesel vehicle has used an
oxidation catalyst, a diesel particulate filter (DPF), a selective
catalytic reduction (SCR) catalyst, and the like and a combination
and a disposition position of the catalysts are differently
determined depending on a design of the vehicle.
[0008] In this case, a diesel particulate filter physically
captures particulate materials such as soot included in exhaust gas
and when the diesel particulate filter captures the particulate
materials after a vehicle drives a predetermined distance or at a
difference pressure between both ends thereof which is equal to or
more than a set reference pressure, the captured materials are
combusted and regenerated due to exhaust gas which rises to a high
temperature of approximately 500 to 650.degree. C. depending on a
post-injection control.
[0009] Meanwhile, when the vehicle enters an idle state while the
diesel particulate filter regenerates the particulate materials
depending on the post-injection control, oxygen concentration is
increased and a flux of exhaust gas is reduced to cause abnormal
DPF regeneration. In this case, when the diesel particulate filter
exceeds an endurance limit temperature and a limit temperature
gradient of a filter, melting, cracks, and the like occur in the
diesel particulate filter, such that the diesel particulate filter
may be damaged.
[0010] Generally, the DPF filter may be mainly made of materials
such as SiC and cordierite which may be damaged. In this case, the
endurance limit temperature of the filter is approximately
1100.degree. C. and the limit temperature gradient is approximately
400.degree. C./cm.
[0011] As described above, when the vehicle enters the idle state
during the DPF regeneration process, the oxygen concentration is
increased and the flux of exhaust gas is reduced to cause the
abnormal DPF regeneration, such that the DPF may be damaged.
[0012] FIG. 1 is a graph illustrating an operation temperature of
the filter and a gradient temperature of the filter when the
vehicle enters the idle state during the DPF regeneration process.
As illustrated in FIG. 1, the DPF regeneration process is made
while the engine is driven at approximately 2000 rpm and the oxygen
concentration of a front end of the DPF is controlled to be 15% or
less in section "A" in which a general driving state is represented
and the vehicle is driven at approximately 700 to 800 rpm and the
oxygen concentration of the front end of the DPF is controlled to
be 8% or less when the vehicle enters the so-called idle state
during drop to idle (section "B") and then the oxygen concentration
of the front end of the DPF is not controlled in a section "C".
[0013] In this case, when the vehicle enters the idle state and the
DPF regeneration process exits after a predetermined time lapses,
as illustrated, the operation temperature of the filter rises, and
thus reaches point "a" which is a highest temperature and the
gradient temperature of the filter also reaches point "b" which is
a highest temperature.
[0014] That is, when the generation process exits in the state in
which a large amount of soot is still present in the DPF, the
oxygen concentration is increased and when an excessive amount of
oxygen is supplied to an ignited filter, the temperature in the
filter suddenly rises and thus the gradient temperature of the
filter also suddenly rises.
[0015] Therefore, the damage possibility of the DPF is increased,
and therefore the present invention relates to a method and a
system of maintaining DPF regeneration for improving durability of
a DPF filter for solving the existing problems.
[0016] The related art for solving the existing problems as
described above is disclosed. In connection with the related art, a
related art entitled "Apparatus And Method For Protection Diesel
Particulate Filter" is implemented by determining whether abnormal
DPF regeneration occurs when a vehicle enters an idle state during
the generation of the diesel particulate filter to prevent the
diesel particulate filter from rising to a limit temperature or
more but has a limitation that it does not disclose the technical
spirit of the present invention which maintains the DPF
regeneration for a predetermined time even when the vehicle enters
the idle state until a soot mass in the DPF is a predetermined
reference value or less.
[0017] The information disclosed in this Background of the
Invention section is only for enhancement of understanding of the
general background of the invention and should not be taken as an
acknowledgement or any form of suggestion that this information
forms the prior art already known to a person skilled in the
art.
BRIEF SUMMARY
[0018] Various aspects of the present invention are directed to
providing a method and a system of maintaining DPF regeneration for
improving durability of a DPF filter capable of preventing a damage
of the DPF by maintaining the DPF regeneration process until a soot
mass in the DPF is equal to or less than a set target reference
value even when a vehicle enters an idle state during the DPF
regeneration process so as to prevent the damage of the DPF which
occurs when the vehicle enters the idle state during the DPF
regeneration process.
[0019] In an aspect of the present invention, a method of
maintaining diesel particulate filter (DPF) regeneration for
improving durability of a DPF, may include determining, by a
controller, whether a vehicle enters an idle state during the DPF
regeneration, controlling, by the controller, a concentration of
oxygen introduced into the DPF to be equal to or less than a first
reference value when the vehicle enters the idle state, and
performing, by the controller, a regeneration process until a soot
mass in the DPF is equal to or less than a target reference
value.
[0020] The method may further include, after the determining
whether the vehicle enters the idle state during the DPF
generation, comparing, by the controller, the soot mass in the DPF
with a preset soot reference value when the vehicle enters the idle
state.
[0021] The method may further include, in the comparing of the soot
mass in the DPF with the preset soot reference value when the
vehicle enters the idle state, when the soot mass in the DPF is
equal to or more than the preset soot reference value, controlling,
by the controller, the concentration of the oxygen introduced into
the DPF to be equal to or less than the first reference value, and
when the soot mass in the DPF is less than the preset soot
reference value, controlling, by the controller, the concentration
of the oxygen introduced into the DPF to be equal to or less than a
second reference value larger than the first reference value.
[0022] The concentration of the oxygen introduced into the DPF is
controlled by using a shutoff valve installed in front of an
engine.
[0023] In another aspect of the present invention, a system of
maintaining DPF regeneration for improving durability of a diesel
particulate filter (DPF), may include the DPF capturing a soot
captured in exhaust gas, and a controller receiving a signal about
whether a vehicle is currently in an idle state to maintain the DPF
regeneration in the idle state of the vehicle until a soot mass in
the DPF reaches a target reference value to prevent the DPF from
arriving at a limit temperature and a limit temperature
gradient.
[0024] The controller receives the signal about whether the vehicle
is currently in the idle state and controls a concentration of
oxygen introduced into the DPF to be equal to or less than a first
reference value to maintain the DPF regeneration until the soot
mass in the DPF reaches the target reference value.
[0025] The controller receives the signal about whether the vehicle
is currently in the idle state and then determines whether the soot
mass in the DPF is equal to or more than a preset soot reference
value.
[0026] The controller controls the concentration of the oxygen
introduced into the DPF to be equal to or less than the first
reference value when the soot mass in the DPF is equal to or more
than the preset soot reference value, and when the soot mass in the
DPF is less than the preset soot reference value, controlling, by
the controller, the concentration of the oxygen introduced into the
DPF to be equal to or less than a second reference value larger
than the first reference value to maintain the DPF regeneration
until the soot mass in the DPF reaches the target reference
value.
[0027] The controller transfers a signal to a shutoff valve
installed in front of an engine to control a concentration of
oxygen introduced into the DPF.
[0028] It is understood that the term "vehicle" or "vehicular" or
other similar terms as used herein is inclusive of motor vehicles
in general such as passenger automobiles including sports utility
vehicles (SUV), buses, trucks, various commercial vehicles,
watercraft including a variety of boats and ships, aircraft, and
the like, and includes hybrid vehicles, electric vehicles, plug-in
hybrid electric vehicles, hydrogen-powered vehicles and other
alternative fuel vehicles (e.g., fuel derived from resources other
than petroleum). As referred to herein, a hybrid vehicle is a
vehicle that has two or more sources of power, for example, both
gasoline-powered and electric-powered vehicles.
[0029] The methods and apparatuses of the present invention have
other features and advantages which will be apparent from or are
set forth in more detail in the accompanying drawings, which are
incorporated herein, and the following Detailed Description, which
together serve to explain certain principles of the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] FIG. 1 is a graph illustrating a variation of an operation
temperature and a gradient temperature of a DPF which occurs while
exiting a DPF regeneration process when a vehicle enters an idle
state while the vehicle is driven, according to the related
art.
[0031] FIG. 2 and FIG. 3 are flow charts of a method of maintaining
DPF regeneration for improving durability of a DPF filter according
to an exemplary embodiment of the present invention.
[0032] FIG. 4 is a flow chart illustrating a detailed control for
each process of the method of maintaining DPF regeneration for
improving durability of a DPF filter according to an exemplary
embodiment of the present invention.
[0033] FIG. 5 is a graph confirming that durability of DPF is
improved by a control logic according to an exemplary embodiment of
the present invention.
[0034] FIG. 6 is a graph illustrating a concentration of oxygen
introduced into the DPF and a soot mass remaining within the DPF
depending on a control process according to an exemplary embodiment
of the present invention.
[0035] FIG. 7 is a schematic diagram of a system of maintaining DPF
regeneration for improving durability of a DPF filter according to
an exemplary embodiment of the present invention.
[0036] It should be understood that the appended drawings are not
necessarily to scale, presenting a somewhat simplified
representation of various features illustrative of the basic
principles of the invention. The specific design features of the
present invention as disclosed herein, including, for example,
specific dimensions, orientations, locations, and shapes will be
determined in part by the particular intended application and use
environment.
DETAILED DESCRIPTION
[0037] Reference will now be made in detail to various embodiments
of the present invention(s), examples of which are illustrated in
the accompanying drawings and described below. While the
invention(s) will be described in conjunction with exemplary
embodiments, it will be understood that the present description is
not intended to limit the invention(s) to those exemplary
embodiments. On the contrary, the invention(s) is/are intended to
cover not only the exemplary embodiments, but also various
alternatives, modifications, equivalents and other embodiments,
which may be included within the spirit and scope of the invention
as defined by the appended claims.
[0038] FIG. 2 is an overall flow chart of a method of maintaining
DPF regeneration for improving durability of a DPF filter according
to various embodiments of the present invention. As illustrated in
FIG. 2, the method of maintaining DPF regeneration for improving
durability of a DPF filter according to various embodiments of the
present invention largely includes determining whether a vehicle
enters an idle state (S100), controlling a concentration of oxygen
introduced into the DPF to be equal to or less than a set first
reference value (S200), and performing a DPF regeneration process
until a soot mass in the DPF is equal to or less than a set target
reference value (S300).
[0039] First, the determining whether the vehicle enters the idle
state during the regeneration process of the DPF filter is
performed (S100) and it may be detected whether the vehicle enters
the idle state based on various information such as an acceleration
pedal signal and a gear ratio.
[0040] Meanwhile, it is confirmed that the vehicle enters the idle
state during the DPF regeneration process by using several signal
of the vehicle as described above, the controlling of the
concentration of oxygen introduced into the DPF to be equal to or
less than the set first reference value is performed (S200).
[0041] That is, the oxygen concentration is controlled to be equal
to or less than the set first reference value to prevent the DPF
filter from being exposed to a high temperature for improving the
durability of the DPF, in which the oxygen concentration which is
the first reference value may be controlled to 8% or so.
[0042] Meanwhile, the regeneration process is performed until an
amount of soot in the DPF is equal to or less than the set target
reference value while the concentration of oxygen introduced into
the DPF is controlled to be equal to or less than the first
reference value as described above.
[0043] That is, according to the related art, the DPF regeneration
process exits after the predetermined time lapses when the vehicle
enters the idle state during the DPF regeneration process. In this
case, the regeneration process is suspended while a large amount of
soot still remains in the DPF, and then, the oxygen concentration
is increased, such that the temperature of the DPF filter may rise
while the soot burning in the DPF is excessively burned due to the
excessively supplied oxygen. To prevent the above problem, various
embodiments of the present invention have a characteristic in that
the DPF regeneration process is maintained until the soot mass in
the DPF falls to the set target reference value or less even though
the vehicle enters the idle state during the DPF regeneration
process.
[0044] Meanwhile, the target reference value may be set to be 2%
but a volume of the DPF is diverse. Generally, if it is assumed
that the target reference value is 100% when the soot mass of 8 g
per a volume 1 L of the DPF is present, the regeneration process is
performed until the target reference value reaches 2% based on the
amount.
[0045] Further, as well known, the method for measuring a soot mass
in a DPF measures a soot mass based on a pressure difference using
pressure sensors installed at front and rear ends of the DPF.
[0046] By the foregoing process, while the concentration of oxygen
introduced into the DPF is controlled even though the vehicle
enters the idle state during the regeneration process, the
regeneration process is performed until the soot mass in the DPF is
equal to or less than the set target reference value to prevent the
DPF from arriving at a maximum limit temperature and a limit
temperature gradient of the DPF filter, such that it is possible to
previously prevent the DPF from being damaged.
[0047] Meanwhile, as illustrated in FIG. 3, the method of
maintaining DPF regeneration for improving durability of a DPF
filter according to various embodiments of the present invention
further includes comparing the soot mass in the DPF with a preset
soot reference value when the vehicle enters the idle state (S110)
after determining whether the vehicle enters the idle state during
the regeneration of the DPF (S100). That is, when the soot mass in
the DPF is equal to or more than 30% which is the soot reference
value, the soot mass in the DPF is much and thus a lot of the soot
are excessively burned to excessively rise the temperature of the
DPF when the concentration of oxygen introduced into the DPF is
excessively higher and thus the concentration of oxygen introduced
into the DPF is controlled to be equal to or less than the set
first reference value.
[0048] In this case, in the comparing of the soot mass in the DPF
with the preset soot reference value when the vehicle enters the
idle state (S110), when the soot mass in the DPF is equal to or
more than the preset soot reference value, the method of
maintaining DPF regeneration for improving durability of a DPF
filter according to various embodiments of the present invention
further includes controlling the concentration of oxygen introduced
into the DPF to be equal to or less than a first reference value,
and when the soot mass in the DPF is less than the preset soot
reference value, controlling, by the controller, the concentration
of the oxygen introduced into the DPF to be equal to or less than a
second reference value larger than the first reference value in
which the second reference value may be set to be 15%.
[0049] That is, in case which the soot mass in the DPF is less than
30%, the soot mass in the DPF to be burned oxygen introduced into
the DPF is relatively smaller, even when the concentration of
oxygen introduced into the DPF is controlled to be 15%, not to be
8%. Thus, the regeneration of the DPF can be swiftly completed
while damage of the DPF is prevented because temperature rise of
the DPF is relatively smaller compared with that in case which the
soot mass in the DPF is more than 30%.
[0050] Meanwhile, FIG. 4 is a flow chart illustrating a detailed
control for each process of the method of maintaining DPF
regeneration for improving durability of a DPF filter according to
various embodiments of the present invention.
[0051] The detailed control method is described in advance, and
therefore is omitted herein. However, the regeneration process is
performed until the soot mass in the DPF is equal to or less than
the set target reference value and then the regeneration process
ends and after it is confirmed whether the engine of the vehicle
starts, if it is determined that the engine does not start, the
control logic ends and if it is determined that the engine starts,
it is again determined whether the soot mass in the DPF is 100% and
then the control logic as described above is again performed.
[0052] FIG. 5 is a graph illustrating an experiment result that the
durability of the DPF is improved by maintaining the regeneration
process by the foregoing control process until the soot mass in the
DPF is equal to or less than the target reference value even when
the vehicle enters the idle state during the regeneration
process.
[0053] As illustrated, the regeneration process is performed until
the soot mass in the DPF is equal to or less than the target
reference value when the vehicle enters the idle state during the
regeneration process and thus an operation temperature X of the DPF
and a gradient temperature Y in the filter are formed to be smaller
than a limit value as compared with the related art, thereby
confirming that the durability of the DPF is improved.
[0054] For reference, region "A" is a region in which the
concentration of oxygen introduced into the DPF is controlled to be
equal to or less than 15%, region "B" is a region in which the
concentration of oxygen intruded into the DPF is controlled to be
equal to or less than 8%, region "C" is a region in which the
concentration of oxygen again introduced into the DPF is controlled
to be equal to or less than 15%, and region "D" is a region in
which the concentration of oxygen introduced into the DPF is no
more controlled.
[0055] Further, FIG. 6 is a graph illustrating a change in a
variation of the soot mass in the DPF by controlling an engine
speed and the concentration of oxygen introduced into the DPF
according to various embodiments of the present invention.
[0056] As illustrated, the concentration of oxygen introduced into
the DPF according to various embodiments of the present invention
is controlled when the vehicle enters the idle state while the
regeneration process is performed while the vehicle is driven and
the regeneration process is performed until the soot mass in the
DPF is equal to or less than the set target reference value,
thereby improving the durability of the DPF.
[0057] Meanwhile, the concentration of oxygen introduced into the
DPF is controlled by using a shutoff valve installed in front of
the engine.
[0058] FIG. 7 is an overall configuration diagram of a system of
maintaining DPF regeneration for improving durability of a DPF
filter according to various embodiments of the present invention.
As illustrated, the system includes the DPF capturing the soot
captured in exhaust gas and a controller 100 which receives a
signal about whether the vehicle is currently in the idle state to
maintain the regeneration in the idle state of the vehicle until
the soot mass in the DPF reaches the set target reference value so
as to prevent the DPF from arriving at the limit temperature and
the limit temperature gradient.
[0059] The controller 100 receives the signal about whether the
vehicle is currently in the idle state and controls the
concentration of oxygen introduced into the DPF to be equal to or
less than the first reference value to maintain the regeneration
until the soot mass in the DPF reaches the set target reference
value.
[0060] Further, the controller 100 further includes receiving the
signal about whether the vehicle is currently in the idle state and
then controlling the concentration of the oxygen introduced into
the DPF to be equal to or less than the first reference value when
the soot mass in the DPF is equal to or more than the preset soot
reference value, and when the soot mass in the DPF is less than the
preset soot reference value, controlling, by the controller, the
concentration of the oxygen introduced into the DPF to be equal to
or less than a second reference value larger than the first
reference value until the soot mass in the DPF reaches the set
target reference value.
[0061] The detailed control method thereof has been described
above, and a description thereof will be omitted herein.
[0062] According to the method and system of maintaining DPF
regeneration for improving durability of a DPF filter according to
various embodiments of the present invention by the configuration
and control as described above, it is possible to improve the
durability of the DPF by performing the DPF regeneration process
until the soot mass in the DPF falls to the target reference value
or less even when the vehicle enters the idle state during the DPF
regeneration process.
[0063] According to the method and system of maintaining DPF
regeneration for improving durability of a DPF filter according to
various embodiments of the present invention configured as
described above, it is possible to improve the durability of the
DPF by controlling the amount of oxygen introduced into the DPF for
the temperature of the DPF to be below the endurance limit
temperature and the limit temperature gradient of the DPF filter
and performing the DPF regeneration process until the soot mass in
the DPF is equal to or less than the target reference value.
[0064] The foregoing descriptions of specific exemplary embodiments
of the present invention have been presented for purposes of
illustration and description. They are not intended to be
exhaustive or to limit the invention to the precise forms
disclosed, and obviously many modifications and variations are
possible in light of the above teachings. The exemplary embodiments
were chosen and described in order to explain certain principles of
the invention and their practical application, to thereby enable
others skilled in the art to make and utilize various exemplary
embodiments of the present invention, as well as various
alternatives and modifications thereof. It is intended that the
scope of the invention be defined by the Claims appended hereto and
their equivalents.
* * * * *