Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1981-07-09
1983-07-12
Cox, Ronald B.
Internal-combustion engines
Engine speed regulator
Idle speed control
123585, 123361, F02D 1110
Patent
active
043924689
ABSTRACT:
An engine has a main intake passage in which a throttle valve is disposed. A bypass passage is branched off from the main intake passage upstream of the throttle valve and is connected to the main intake passage located downstream of the throttle valve. A flow control valve, actuated by a stepper motor, is arranged in the bypass passage. In an electronic control unit, the mean value of the step position is stored, and a lower limit of the step position is calculated from the mean value of the step position. When the engine is idling after it has been and the stepper motor is rotated in a direction wherein the flow control valve closes the rotating operation of the stepper motor is stopped when the step position of the stepper motor reaches thelower limit of the step position. This allows for precise control of the flow control valve, while preventing the sudden rapid closing of the valve, thus improving engine performance.
REFERENCES:
patent: 3964457 (1976-06-01), Coscia
patent: 4203395 (1980-05-01), Cromas
patent: 4237833 (1980-12-01), Les Cauriers
patent: 4291656 (1981-09-01), Miyagi
Itoh Hiroshi
Kobashi Mamoru
Cox Ronald B.
Toyota Jidosha Kogyo Kabushiki Kaisha
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