Process for controlling the torque of an internal combustion eng

Details Process for controlling the torque of an internal combustion eng Process for controlling the torque of an internal combustion eng

1993-05-19

1995-01-24

Kwon, John T.

Interrelated power delivery controls, including engine control

Transmission control

Engine controlled by transmission

477107, B60K 4104

Patent

active

053838246

DESCRIPTION:

BRIEF SUMMARY
This application is filed under rule 35 USC 371 and is a continuation application of PCT/EP91/02167 filed Nov. 18, 1991.
The invention concerns a process for controlling the torque of an internal combustion engine which drives a motor vehicle via an automatic gear system, including a control device for the internal combustion engine, which based on speed, load and, where appropriate, temperature signals, controls an ignition angle of an ignition system and/or an injection pulse width of a fuel injection system and a gear control device for the automatic gear system which, based on speed and load requirement signals, controls gear changes of the automatic gear system.
A process for control of the torque of an internal combustion engine of the above kind has been disclosed in DE-C 29 35 916. According to said publication, a jolt occurring during the gear change of the automatic gear system is to be reduced by reducing the torque of the internal combustion engine during the gear change. By virtue of the reduced torque of the internal combustion engine during the course of the change, the grinding period of the friction clutches of the automatic gear system that take part in the gear change can also be reduced together with a reduction of the jolt so that there is less wear and less heating of the friction elements. The control device for the internal combustion engine is equipped with an identification circuit which, during a gear change, receives a switch signal from the gear control. Performance graphs, according to which the ignition angle and/or the injection pulse width are controlled according to load and speed, are deposited in a memory of the control device for the internal combustion engine. If a switch signal is fed to the identification circuit of the control device of the internal combustion engine, the control device automatically switches over to another performance graph in which the torque of the internal combustion engine is reduced by an adjustment of the ignition angle to a "late" direction or a reduction of the amount of the fuel injected. Problems are created here by the exact determination of the moment of reducing the torque. Besides, such a storage of different performance graphs and a switch over of performance graphs are relatively expensive. It is finally to be concluded that in modern drive concepts such a control of the drive torque of the internal combustion engine only on the basis of switch signals of the gear control is not sufficient, especially since the torque transmitted by the internal combustion engine to the automatic gear system also has a great importance for the travel behavior of the motor vehicle and affects the fuel consumption.
Therefore, the problem to be solved by this invention is to provide a process for controlling an internal combustion engine where the torque of the internal combustion engine can always be adjusted to a favorable value, even at low control cost.
In a process of the kind mentioned, said problem is solved according to the invention by the fact that computer systems of the gear and engine control constantly communicate, via interfaces, wherein the control device of the internal combustion engine receives from the gear control device, in a cyclic time beat, a percentage torque requirement on the basis of which the control device of the internal combustion engine automatically affects the torque of the internal combustion engine. According to the process of the invention, a de-central microprocessor system is used in which, via serial or parallel interfaces, the individual microprocessors of the control unit of the internal combustion engine and of the gear system control device exchange data. Through the interfaces, the actual data of the gear control device and corresponding requirements are always passed on to the control device for the internal combustion engine which can thereby adapt, in an ideal manner, to the gear control unit. Thus, the gear control unit can always transmit to the control device of the internal combustion engine, in th

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