Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1997-05-22
1999-10-05
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60286, 123300, F02M 4502, F01N 320, F02D 4140
Patent
active
059606274
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and a device for controlling an internal combustion engine.
BACKGROUND INFORMATION
A method and a device for controlling an internal combustion engine are disclosed, for example, in German Patent Application No. 34 36 768 (U.S. Pat. No. 4,633,837).
In diesel gasoline engines, it is also known to meter hydrocarbons into the exhaust pipe using a metering pump. These hydrocarbons and the nitrous oxides contained in the exhaust gas are converted in a reduction catalytic converter into carbon dioxide, nitrogen, and water.
To render possible this reduction of nitrous oxides, a dosing device must be additionally provided.
SUMMARY OF THE INVENTION
An object of the present invention is to improve the exhaust emission properties, keeping the outlay and costs as low as possible.
The procedure in accordance with the present invention will enable the exhaust emission properties of the internal combustion engine to be improved cost-effectively.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the fuel metering system according to the present invention.
FIG. 2 depicts an output stage for driving various load-circuit components of the device according to the present invention.
FIG. 3a shows a first metering cycle of a first engine type plotted over the arc of crankshaft rotation.
FIG. 3b shows a second metering cycle of a first engine type plotted over the arc of crankshaft rotation.
FIG. 3c shows a third metering cycle of a first engine type plotted over the arc of crankshaft rotation.
FIG. 4a shows a first metering cycle of a second engine type plotted over the arc of crankshaft rotation.
FIG. 4b shows a second metering cycle of a second engine type plotted over the arc of crankshaft rotation.
FIG. 5a shows a first metering cycle of a third engine type plotted over the arc of crankshaft rotation.
FIG. 5b shows a second metering cycle of a third engine type plotted over the arc of crankshaft rotation.
DETAILED DESCRIPTION
The device according to the present invention is illustrated in the following based on the example of a self-ignition internal combustion engine, where the fuel metering is controlled by means of a solenoid valve. The specific embodiment shown in FIG. 1 relates to a "common-rail system". However, the procedure in accordance with the present invention is not limited to these systems. It can be employed in all systems where an appropriate fuel metering is possible. This is the case in solenoid-valve-controlled fuel metering systems.
100 denotes an internal combustion engine which is supplied with fresh air via an intake line 105 and gives off exhaust gas via an exhaust pipe 110. A reduction catalytic converter 115 is arranged in exhaust pipe 110.
The illustrated internal combustion engine is a four-cylinder internal combustion engine. Each cylinder of the internal combustion engine has an allocated injector 120, 121, 122 and 123. Fuel is metered via solenoid valves 130, 131, 132 and 133 to the injectors. The fuel arrives from a "rail" 135 via injectors 120, 121, 122 and 123 into the cylinders of internal combustion engine 100.
The fuel in rail 135 is pressurized to an adjustable pressure by a high-pressure pump 145. High-pressure pump 145 is connected via a solenoid valve 150 to a fuel-supply pump 155. The fuel-supply pump communicates with a fuel supply tank 160.
Valve 150 comprises a coil 152. Solenoid valves 130, 131, 132 and 133 contain coils 140, 141, 142 and 143, which are each able to receive current by means of an output stage 175. Output stages 175 are preferably arranged in a control unit 170, which drives coil 152 accordingly.
In addition, a sensor 177 is provided, which detects the pressure prevailing in rail 135 and directs a corresponding signal to control unit 170.
The functioning of this device will be described as follows. Fuel-supply pump 155 delivers the fuel from the supply tank via valve 150 to high-pressure pump 145. High-pressure pump 145 builds up a specifiable pressure in rail 135. Pressure values greater
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patent: 5193340 (1993-03-01), Kamihara
patent: 5207058 (1993-05-01), Sasaki et al.
patent: 5343702 (1994-09-01), Miyajima et al.
patent: 5479775 (1996-01-01), Kraemer et al.
patent: 5642705 (1997-07-01), Morikawa et al.
Hafner Arno
Krampe Wolfgang
Argenbright Tony M.
Robert & Bosch GmbH
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