Engine control system including engine idle speed control
An engine control system is described including engine idle speed control apparatus, comprising: means for providing an error signal related to the difference between actual sensed engine speed and a desired engine idle speed; means coupled to the error signal providing means for implementing, when enabled, a closed loop engine idle speed control in accordance with a control signal related to at least the magnitude of the error signal; and means coupled to the engine idle speed control means for selectively enabling the closed loop idle speed control means in response to at least the magnitude of the actual speed being substantially equal to the desired engine idle speed, and disabling and closed loop control means whenever the actual speed is above a predetermined speed which is greater than the desired speed. The closed loop idle speed control means includes means for positioning air-fuel mixture control apparatus in accordance with the control signal, and means for storing, until the closed loop idle speed control means is enabled, the magnitude of a signal related to the position of the control apparatus at a magnitude related to the magnitude which existed when the closed loop idle speed control means was last enabled, and utilizing the stored magnitude to implement initial closed loop control of the air-fuel mixture control apparatus by initially determining the control signal when the idle speed control means is enabled.
- Assignee:
- Motorola, Inc., Schaumburg, IL
- Patent Number(s):
- US 4597047
- OSTI ID:
- 5589241
- Resource Relation:
- Patent File Date: Filed date 18 Apr 1985
- Country of Publication:
- United States
- Language:
- English
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