Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1987-10-19
1989-03-28
Dolinar, Andrew M.
Internal-combustion engines
Engine speed regulator
Idle speed control
123362, F02D 4116
Patent
active
048154334
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and a device for controlling and/or regulating the idling speed of an internal combustion engine.
It has been known to take into consideration the operating state of an internal combustion engine for regulating the idling speed. The regulation of the idems speed has been performed, for example, by determines idling speed values for defined operating conditions of the internal combustion engine and regulating the speed of the internal combustion engine based on these predetermined values. Generally, with the assistance of the known precontrols it has been possible to quickly stabilize changes in the operating state of the internal combustion engine, for example, the load change of the internal combustion engine during switching on an air conditioning unit, for example, during the regulating of the idling speed of the internal combustion engine.
With each internal combustion engine not only short term changes in the operational state occur, like, for example, the mentioned load jump during the switching on of the air conditioning unit, but the operational state of the internal combustion engine also causes long term changes. Such long term changes are mostly caused by aging effects of the total internal combustion engine. These long term changes have not taken into consideration in the known idling speed regulating, consequently, the idling speed could not been regulated to optimal values for a long term by the known idling speed regulator, so that the transmissions to the idling speed were performed with higher or lower oscillations of the speed of the internal combustion engine.
SUMMARY OF THE INVENTION
In is an object of this invention to provide an improved method and device for controlling the idling speed of an internal combustion engine.
In contrast to the above described conventional methods the method for controlling and/or regulating the idling speed of an internal combustion engine according to the invention is advantageous in that long term changes of the operational state of the internal combustion engine can be considered during the regulation of the idling speed of the internal combustion engine due to the correction of the precontrol of the idling speed regulation which is dependent from the operational state of the internal combustion engine.
In accordance with the invention two possibilities of the correction of the precontrol of the idling speed regulation of the internal combustion engine are provided, namely the direct correction, that is, the change of the precontrol values themselves or the indirect correction, that is, the change of the precontrol values by the addition of correcting values.
Generally, the method in accordance with the invention provides an optimal building up of the speed of the internal combustion engine into the idling speed, for example, from the operational conditions with the partial load or the switching off signal.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an indirect correction of the precontrol of the idling speed of an internal combustion engine;
FIG. 2 is a schematic diagram of the realisation of the indirect correction of FIG. 1;
FIG. 3 is a graph showing a direct correction of the precontrol of the idling speed regulation of an internal combustion engine;
FIG. 4 is a schematic diagram of the realisation of the direct correction of FIG. 3;
FIG. 5 is a schematic diagram illustrating the correction device of FIG. 4 and
FIG. 6 is a schematic diagram of a further embodiment of the precontrol of the idling speed of an internal combustion engine.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The described exemplified embodiments relate to the control and/or the regulation of the idling speed of an internal combustion engine. This idling speed regulation can be generally used in conjunction with internal combustion engines, that is, in conjunction with Otto-internal combustion engines, with Diesel-internal combustion engines, etc. Also, the exemplified embodiments described he
REFERENCES:
patent: 4305360 (1981-12-01), Meyer et al.
patent: 4545348 (1985-10-01), Ikeura
patent: 4567869 (1986-02-01), Peter et al.
patent: 4597047 (1986-06-01), Deutsch
Dolinar Andrew M.
Robert & Bosch GmbH
Striker Michael J.
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