Internal-combustion engines – Combustion chamber means having fuel injection only – Combustible mixture stratification means
Patent
1999-07-20
2000-12-19
Yuen, Henry C.
Internal-combustion engines
Combustion chamber means having fuel injection only
Combustible mixture stratification means
701103, F02D 4134, F02D 4114, F02B 1700
Patent
active
06161517&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a device for controlling a controlled-ignition direct-injection internal combustion engine, particularly a high-pressure, direct-injection engine.
According to document DE 42 32 974, a control device for a controlled-ignition internal combustion engine has a device for determining a datum torque. It also comprises a device for determining the throttle valve angle which determines this angle as a function of the datum torque. For this purpose, in the device for determining the throttle valve angle, there is an inverse model of the filling of the inlet tract and of the cylinder of the internal combustion engine and a table of throttle valve opening angles.
In publication SAE 960465 "Gasoline direct injection: Actual trends and future strategies for injection and combustion systems", by G. K. Fraidl, W. F. Piock and M. Wirth, it is proposed that a direct-injection controlled-ignition internal combustion engine be made to run in stratified-charge combustion mode in the lower part load spectrum. For this purpose, an air/fuel ratio greater than 100 is preferably set. In the upper part-load spectrum, it is proposed that the engine be run in homogeneous-charge or in stratified-charge combustion mode, alternately. Thus, a system for the subsequent treatment of the exhaust gases, such as a DeNox catalyst, can be regenerated. In this way, the legally imposed restrictions on emission can be met.
SUMMARY OF THE INVENTION
However, an abrupt variation of the torque on the output shaft of the internal combustion engine may occur during the change from homogeneous-charge combustion mode to stratified-charge combustion mode and vice versa, and this is to the detriment of driving comfort.
The object of the invention is to produce a control device designed to minimize this variation in torque when changing from homogeneous-charge to stratified-charge combustion mode and vice versa.
This object is achieved by means of a device for controlling a controlled-ignition direct-injection internal combustion engine, comprising means of determining a reference value of a transmission torque as a function of the position of an accelerator pedal, means of calculating the value of at least one command of at least one means of controlling the engine on the basis of the datum value for the transmission torque, said calculation means comprising a first inverse model of the engine in its homogeneous-charge combustion mode and a second inverse model of the engine in its stratified-charge combustion mode, and correction means designed to correct the datum value of the transmission torque as a function of the engine combustion mode by applying a torque correction taken from a correction table as a function of at least one variable representing the load on the engine.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In a preferred embodiment of the invention, the control device has an adaptation device which adapts the torque correction values in the correction table as a function of an internal combustion engine output variable. Thus, the modifications to the effective behavior of the engine which are brought about by manufacturing tolerances or by the aging of the engine, can be compensated for.
In another advantageous embodiment of the invention, the adaptation is performed within a predetermined period of time around a change in combustion mode from homogeneous-charge to stratified-charge or from stratified-charge to homogeneous-charge.
Other features and advantages of the control device according to the invention will become clear from reading the description which will follow and from examining the appended drawings, in which:
FIG. 1 depicts a control device for an internal combustion engine according to the invention, and
FIG. 2 depicts a second embodiment or the control device according to the invention.
Elements of identical construction or which have the same function are denoted by the same reference on all the drawings.
FIG. 1 shows a control device acc
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Japanese Patent Abstract No. 06036719 (Hitoshi), dated Feb. 10, 1994.
"Gasoline Direct Injection: Actual Trends and Future Strategies for Injection and Combustion Systems", G.K. Fraidl et al., AVL List GmbH, Graz, Austria, pp. 1-17.
Castro Arnold
Greenberg Laurence A.
Lerner Herbert L.
Siemens Automotive S.A.
Stemer Werner H.
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