Engine idle speed control with feedforward power adjustment
In a motor vehicle including an engine for supplying the input power requirement of a power assist steering system which develops a working pressure in relation to the level of steering assist demanded by the operator of the vehicle, where the engine power output under idle conditions is governed by the setting of an adjustable engine power control mechanism, an engine idle speed control system is described comprising: closed loop idle speed control means for effecting relatively slow adjustment of the engine power control mechanism in relation to the difference between the actual engine idle speed and a desired engine idle speed value so as to bring the actual idle speed into substantial correspondence with the desired idle speed; feedforward idle speed control means for effecting relatively fast adjustment of the engine power control mechanism in response to changes in the input power requirement of the power assist steering system.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4724810
- OSTI ID:
- 5107347
- Country of Publication:
- United States
- Language:
- English
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