Idle speed control method and system for an internal combustion

Details Idle speed control method and system for an internal combustion Idle speed control method and system for an internal combustion

1982-06-28

1983-09-06

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

123340, 123585, F02B 3200, F02B 300, F02M 2506

Patent

active

044022891

ABSTRACT:
An intake air flow rate control method and system for an internal combustion engine includes an open loop control strategy carried out during unstable engine driving conditions. During open loop control, a pulse signal applied to an air flow rate control valve means is determined both as a function of open loop ratio and feedback ratio. The duty cycle of the pulse signal for open loop control is varied corresponding to engine coolant temperature as well as engine load condition. Thus, open switching control operation from open loop control to feedback control, varying of pulse duty cycle to be applied to the valve means occurs smoothly. Further, in open loop control, the control system smoothly follows variations in engine load conditions.

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