U.S. patent application number 10/570166 was filed with the patent office on 2006-10-26 for exhaust gas aftertreatment device for diesel engines of vehicles, preferably passenger cars.
This patent application is currently assigned to Hydraulik-Ring GmbH. Invention is credited to Stefan Klotz, Dieter Maisch, Roland Meyer, Wolgang Stephan.
Application Number | 20060236679 10/570166 |
Document ID | / |
Family ID | 34202410 |
Filed Date | 2006-10-26 |
United States Patent
Application |
20060236679 |
Kind Code |
A1 |
Meyer; Roland ; et
al. |
October 26, 2006 |
Exhaust gas aftertreatment device for diesel engines of vehicles,
preferably passenger cars
Abstract
An exhaust gas after treatment device for a diesel engine of a
vehicle has at least one injection valve with an injection nozzle
through which an exhaust gas treatment medium is injected into an
exhaust pipe. At least one pump is provided that conveys the
exhaust gas treatment medium to the at least one injection valve.
At least one sensor and at least one control are also provided. The
pump, the sensor, and the injection valve are connected to the at
least one control. The at least one pump and the at least one
control are combined to an assembly, and the assembly also includes
the at least one injection valve.
Inventors: |
Meyer; Roland; (Nurtingen,
DE) ; Maisch; Dieter; (Kohlberg, DE) ; Klotz;
Stefan; (Aichtal, DE) ; Stephan; Wolgang; (Bad
Boll, DE) |
Correspondence
Address: |
GUDRUN E. HUCKETT DRAUDT
LONSSTR. 53
WUPPERTAL
42289
DE
|
Assignee: |
Hydraulik-Ring GmbH
marktheidenfeld
DE
|
Family ID: |
34202410 |
Appl. No.: |
10/570166 |
Filed: |
August 19, 2004 |
PCT Filed: |
August 19, 2004 |
PCT NO: |
PCT/DE04/01847 |
371 Date: |
April 17, 2006 |
Current U.S.
Class: |
60/286 ;
60/289 |
Current CPC
Class: |
Y02T 10/24 20130101;
F01N 11/002 20130101; Y02T 10/47 20130101; F01N 2610/1433 20130101;
Y02T 10/12 20130101; F01N 3/2066 20130101; F01N 2610/14 20130101;
F01N 2610/02 20130101; Y02T 10/40 20130101; F01N 2240/16 20130101;
F01N 2610/148 20130101; F01N 3/36 20130101; Y02A 50/20 20180101;
Y02A 50/2325 20180101 |
Class at
Publication: |
060/286 ;
060/289 |
International
Class: |
F01N 3/00 20060101
F01N003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 2, 2003 |
DE |
10341996.9 |
Claims
1.-20. (canceled)
21. An exhaust gas after treatment device for a diesel engine of a
vehicle, the device comprising: at least one injection valve with
an injection nozzle through which an exhaust gas after treatment
medium is injected into an exhaust pipe; at least one pump
conveying the exhaust gas treatment medium to the at least one
injection valve; at least one sensor; at least one control; wherein
the at least one pump, the at least one sensor, and the at least
one injection valve are connected to the at least one control;
wherein the at least one pump and the at least one control are
combined to an assembly; wherein the assembly comprises the at
least one injection valve.
22. The device according to claim 21, wherein the at least one
injection valve comprises a check valve that opens in a direction
toward the injection nozzle.
23. The device according to claim 22, further comprising a throttle
location arranged downstream of the check valve.
24. The device according to claim 21, wherein at least one of the
at least one pump, the at least one sensor, and the at least one
injection valve are connected electrically to the at least one
control inside the assembly.
25. The device according to claim 21, wherein the at least one
control has a connector for an onboard electric system of a
vehicle.
26. The device according to claim 21, further comprising a control
valve arranged upstream of the at least one injection valve.
27. The device according to claim 26, wherein the control valve is
arranged in a housing.
28. The device according to claim 27, wherein the housing is a part
of the assembly and the at least one pump is arranged in the
housing.
29. The device according to claim 27, wherein the at least one
sensor is arranged in the housing.
30. The device according to claim 29, wherein the at least one
sensor is a pressure sensor.
31. The device according to claim 27, wherein the at least one
control is connected to the housing.
32. The device according to claim 27, further comprising at least
one additional sensor arranged outside of the housing, wherein the
at least one control has a connector for the at least one
additional sensor.
33. The device according to claim 32, wherein the at least one
additional sensor is a temperature sensor.
34. The device according to claim 32, wherein the at least one
additional sensor is arranged external to the assembly.
35. The device according to claim 27, wherein the at least one
injection valve is connected by an expansion hose to the
housing.
36. The device according to claim 35, wherein the expansion hose is
heatable.
37. The device according to claim 27, wherein the housing is
mounted on a diesel fuel tank of the vehicle.
38. The device according to claim 21, wherein the assembly is part
of a metering device.
39. The device according to claim 37, wherein the metering device
and the assembly form a mounting module.
Description
[0001] The invention relates to an exhaust gas after treatment
device for diesel engines of vehicles, preferably passenger cars,
according to the preamble of claim 1.
[0002] Such exhaust gas after treatment devices are employed mainly
in trucks in order to treat the exhaust gas produced by the diesel
engines in such a way that the nitrous oxides (NO, NO.sub.2) are at
least partially captured. For this purpose, a pump is provided that
pumps a 32.5% urea/water solution as an exhaust gas after treatment
medium form a reservoir and supplies it at a certain pressure to an
injection valve. The valve meters the required amount of urea/water
solution into a pressure-controlled airflow. In the case of trucks,
the pressure is taken from the onboard supply system. In the case
of a passenger car, the compressed air must be provided by a
separate air compressor. The airflow entrains the injected
urea/water solution. The emulsion that is produced in this way is
supplied through an aerosol conduit to the injection nozzle at the
exhaust pipe and is injected upstream of the catalyst into the
exhaust pipe. The control, the different sensors, the injection
nozzle at the exhaust pipe, or the pumps are partially arranged so
as to be spatially far apart. Therefore, these individual
components must be connected by a cable harness and the cables must
be laid to all these components. Often, the cables must be placed
in the vicinity of the exhaust where high temperatures are
present.
[0003] The invention has the object to configure the exhaust gas
after treatment device of the aforementioned kind such that, while
it has a simple configuration, it can be mounted in a simple way in
the vehicle.
[0004] This object is solved for the exhaust gas after treatment
device of the aforementioned kind in accordance with the present
invention with the characterizing features of claim 1.
[0005] In the exhaust gas after treatment device according to the
invention at least the pump and the control are combined to an
assembly. The complex laying of cables between these components is
therefore not required so that the device can be mounted in a
simple way.
[0006] Further features of the invention result from the dependent
claims, the description, and the drawing.
[0007] The invention will be explained in more detail with the aid
of an embodiment illustrated in the drawing. The drawing shows the
exhaust gas after treatment device according to the invention in a
schematic illustration.
[0008] For exhaust gas after treatment of diesel engines in trucks
and passenger cars, the nitrous oxides (NO, NO.sub.2) are reduced
by a catalyst. For this purpose, a solution is employed which is
introduced into the exhaust gas flow of the diesel engine. As a
solution, advantageously 32.5% urea/water solution is used that is
stored in a reservoir 1. The reservoir is located in a tank 2 for
diesel fuel. A discharge line 3 extends into the reservoir 1;
within the reservoir, the discharge line is advantageously
connected to a filter 4. The discharge line 3 penetrates
seal-tightly the reservoir 1 and is connected at the wall of the
tank 2 to a conduit 5. The conduit branches to a pump block 6 that
has two parallel-connected pump units 7, 8. Each one of the two
pump units 7, 8 has a check valve 9, 10 that prevents return of
medium into the reservoir 1. The two pump units 7, 8 are connected
to an electric/electronic control 11.
[0009] By means of the pump units 7, 8, the medium is supplied
through an outlet line 12, 13, respectively, to a conveying line 14
in which the medium flows to the control valve 15. Check valves 16,
17 are provided in the outlet lines 12, 13, respectively; they
close toward the pump devices 7, 8. The control valve 15 is also
connected to the control 11.
[0010] The pressure of the medium in the conveying line 14 is
monitored by a pressure sensor 18 that is connected to the control
11.
[0011] In the drawing, the control valve 15 is in a closed position
so that the medium cannot flow in the direction toward a throttle
location 20 provided at the exhaust pipe 19. The throttle location
20 is a component of an injection valve 25 with which the exhaust
gas treatment medium is injected into the exhaust pipe 19. The
exhaust gas flowing through the exhaust pipe 19 takes up the
injected exhaust gas treatment medium. When the control valve 15,
controlled by the control 11, switches into its through position,
the exhaust gas after treatment medium flows from the conveying
line 14 through the control valve 15 into a conveying line 21 that
is advantageously configured as an expansion hose. The conveying
line 21 is connected to the throttle valve 20.
[0012] The temperature of the exhaust gas in the exhaust pipe 19 is
measured by temperature sensor 22 that is connected by a bus 23,
preferably a CAN bus, to the control 11.
[0013] The conveying line 21 is preferably heatable. In this case,
a heating device 24 is provided that is arranged on the conveying
line 21 or is integrated therein. This heating device 24 is also
connected to the control 11.
[0014] The injection valve 25 can be provided optionally with a
check valve 26 that closes toward the conveying line 21. By
providing the check valve 26, the operational safety of the
injection valve 25 is improved.
[0015] The onboard electric system 27 of the vehicle is connected
to the control 11. The control 11 is mounted on a housing 28 in
which the pump 6, its pressure sensor 18, and the control valve 15
are arranged. The housing 28 itself is a component of an assembly
31 which, in turn, is a part of the metering device 29 indicated in
the drawing by a dashed line. In addition to the assembly 31 and
the control 11, the metering device 29 contains the injection valve
25.
[0016] Since the important components of the metering device 29 are
mounted in the housing 28, long cable lengths connecting the
individual components of the after treatment device are not needed.
A significant contribution to this is that the control 11 itself is
provided on the housing 28 and, optionally, can be integrated into
the housing 28. Accordingly, the important components of the after
treatment device are arranged spatially very close together.
[0017] In the housing 28 these parts are protected against
destruction, for example, caused by freezing.
[0018] The control 11 must only be provided with connecting
possibilities for the onboard electric system 27, for the bus line
23, and for the heating device 24 of the conveying line 24.
[0019] The electrically heatable expansion hose 21 extends from the
housing 28 of the metering unit or assembly 31 to the injection
nozzle 25 at the injection location on the exhaust pipe 19. Through
the injection valve 25 the exhaust gas treatment medium is metered
into the exhaust gas flowing in the exhaust pipe 19.
[0020] When at low external temperatures the exhaust gas treatment
medium freezes, the additional volume that is generated because of
the freezing process can be forced through the injection valve 25
into the exhaust pipe 19 if it is not taken up by the heatable
expansion hose 21.
[0021] Within the housing 28 of the assembly 31 a pump solenoid of
the pump 6 can be permanently supplied with electric current
without the pump being in conveying mode. The heating that is
caused by this action is then used for thawing the assembly 31. In
this way, a separate connection to the vehicle cooling system,
which would be otherwise necessary for thawing, is not needed.
[0022] Outside of the housing 28, the expansion hose 21 is heated
in the described way so that the exhaust gas treatment medium
flowing through the expansion hose is heated. This has the result
that also the injection valve 25 is heated to such an extent that
possibly frozen exhaust gas treatment medium will thaw. The
injection nozzle that is provided at the exit of the injection
valve 25 can thus be heated in a reliable way so that it will not
freeze shut.
[0023] Since the components that are present in the metering device
are spatially very close together, the corresponding lines that are
required between the control 11 and these components are thus
short. Accordingly, a cable harness is not needed. All electrically
controlled components are electrically contacted in the housing 28
or the metering device 29 by means of lead frames or flexible
contact films. An electric line to the exhaust pipe 19 for the
pressure sensor 18 is not required because it is arranged within
the housing 28 itself. In the case of frozen exhaust gas medium,
the pump 6 can be used as a heating element in the afore described
way by permanent current supply to its solenoid so that the medium
frozen within the pump is thawed.
[0024] Advantageously, the assembly 31 and the housing 28 are
mounted directly on the tank 2 so that an additional external
intake line for the exhaust gas treatment medium is not
required.
[0025] Since the exhaust gas after treatment device is
advantageously provided in passenger cars, in which--in contrast to
trucks--a compressed air system is not present, the exhaust gas
treatment medium can be easily metered in the described way into
the exhaust gas flow within the exhaust pipe 19 without employing
compressed air.
[0026] Along the exhaust pipe 19 that becomes very hot in operation
there is no cable or electric line.
[0027] The described exhaust gas after treatment device is
freeze-proof, has a compact configuration, and can be produced
inexpensively. The device can also be used for trucks.
* * * * *