Open and closed loop engine idling speed control method and syst

Details Open and closed loop engine idling speed control method and syst Open and closed loop engine idling speed control method and syst

1980-05-05

1982-12-28

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

123340, 123587, 123489, F02B 308, F02M 712, F02B 7510, F02D 104

Patent

active

043655998

ABSTRACT:
An intake air flow rate control method system for an internal combustion engine includes a valve which is provided with an electromagnetically operated actuator responsive to a control signal. The control system identifies a control signal for controlling actuation of the actuator and thereby for controlling the air flow rate generating the control signal indicative of the control. The display selectively carries out closed loop (feedback) control and open loop control corresponding to engine driving conditions. Feedback control is carried out when the engine driving condition is stable (in steady state). To determine a suitable condition control for closed loop, a throttle valve closed position, a transmission neutral, and a vehicle speed are checked. When the throttle valve is closed and the transmission is in neutral, the vehicle speed is less than 8 km/h and/or the fuel supply occurs shut off, a decision to carry out feedback (closed loop) control is made. Thus, according to the present method and system, control of the air flow rate can be effectively and successfully switched corresponding to engine driving condition.

REFERENCES:
patent: 4167396 (1979-09-01), Kondo et al.
patent: 4170201 (1979-10-01), Camp et al.
patent: 4186691 (1980-02-01), Takase et al.
patent: 4191051 (1980-03-01), Kawada et al.
patent: 4237838 (1980-12-01), Kinagawa et al.
patent: 4240145 (1980-12-01), Tano et al.
patent: 4244023 (1981-01-01), Johnson
patent: 4248196 (1981-02-01), Toelle

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