Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1983-06-21
1985-10-08
Nelli, Raymond A.
Internal-combustion engines
Engine speed regulator
Idle speed control
123585, 123440, 123340, 123588, F02B 300, F02D 104, F02D 902
Patent
active
045453489
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, upon 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.
REFERENCES:
patent: 3964457 (1976-06-01), Coscia
patent: 4072137 (1978-02-01), Hattori et al.
patent: 4108127 (1978-08-01), Chapin et al.
patent: 4132200 (1979-01-01), Asano et al.
patent: 4214558 (1980-07-01), Nishioka et al.
patent: 4289100 (1981-09-01), Kinugawa et al.
patent: 4375208 (1983-03-01), Furuhashi et al.
Nelli Raymond A.
Nissan Motor Company Ltd.
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