Control device for internal combustion engines

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Details

123489, 123491, F02D 4106

Patent

active

050219596

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a control device for an internal combustion engine. The control device includes a computer which contains a first datablock for operation under one operating condition, a second datablock for operation under another operating condition and a processor for processing engine operating parameters in accordance with the data from the first or second datablock. The processor includes a switching device responsive to at least one operating parameter for selecting the datablock to be used.


BACKGROUND OF THE INVENTION

Such a control device is known from U.S. Pat. No. 4,398,520. This known control device controls fuel injection and spark ignition in a multi-cylinder internal combustion engine. A processor or computer includes two datablocks containing respective programs for two modes of operation and an arithmetic unit or central processing unit for controlling the injection and ignition in accordance with engine operating parameters and in accordance with a selected one of the programs. The arithmetic unit contains a switching logic or partial load recognition stage which switches from the first datablock to the second responsively to engine load. The switching logic also switches off some of the injection valves so that not all the cylinders produce power. The first and second datablocks are programmed for optimal performance in respective modes in which all cylinders are producing power or only some cylinders are producing power, the latter mode being used under low load.
This known control device, however, does not deal with the problem that it is often necessary or advantageous to operate in accordance with one program when the engine of cold and in accordance with another program when the engine is hot. In particular, it is desirable to be above to operate in a "lambda control" mode in order to minimize emission of noxious or toxic fumes in the exhaust, but this is not possible when the enigine is cold, i.e. when starting the engine.
DE-A- No. 32 33 791 describes a device for calling up and/or optimizing stored data which can be used for testing which of several stored programs, e.g, starting programs, is the best for a control device of an internal combustion engine. It is possible, using an input keyboard, to select different programs and to try out each program to check which is the best during an actual test run of the vehicle. However, there is no suggestion of a changeover from one program to another responsively to an engine operating parameter.


SUMMARY OF THE INVENTION

It is an object of the invention to provide a control device for an internal combustion engine which changes over from one control mode, which is used on starting with the engine cold, to another normal control mode (e.g. lambda control) which, however, is unsuitable for use with a cold engine.
This object is achieved by the control device according to the invention. According to a feature of the control device of the invention, the switching device of the processor is responsive to temperature, more particularly the cooling temperature (T), and switches over from the first datablock, which is programmed for operation under starting conditions, to the second datablock, which is programmed for normal operating conditions, when a predetermined temperature (T.sub.2) is exceeded. This has the advantage that optimum performance of the engine in accordance with engine operating parameters can be obtained when the engine is cold and that optimum combustion conditions can be maintained by the use of lambda control as soon as the engine has warmed up.
The air number lambda is the actual air-to-fuel ratio divided by the stoichiometric air-to-fuel ratio. A measure of the air number lambda can be obtained by means of a lambda probe which is an oxygen sensor and is placed in the exhaust system so as to detect residual oxygen in the exhaust. It comprises a solid electrolyte which is only effective when hot. The output of the lambda probe is used to provide a feedback signal for the contr

REFERENCES:
patent: 4357922 (1982-11-01), Rosenzopf et al.
patent: 4484554 (1984-11-01), Nakajima et al.
patent: 4677559 (1987-06-01), van Bruck
patent: 4723523 (1988-02-01), Kataoka et al.
patent: 4739741 (1988-04-01), Iwata et al.

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