Intake air quantity control method for internal combustion engines
A method is described for controlling the quantity of intake air supplied to an internal combustion engine having an intake passage, a throttle valve arranged in the intake passage, at least one supplementary air passage bypassing the throttle valve, and control valves means arranged across at least one supplementary air passage for controlling the flow rate of supplementary air supplied therethrough to the engine. The method comprises the steps of: (1) detecting the valve opening of the throttle valve; (2) detecting the rotational speed of the engine; and (3) controlling the control valve means in a manner such that the valve opening of the control means is decreased with a decrease in the rotational speed of the engine, when it is determined from the detected valve opening of the throttle valve that the throttle valve is in a substantially fully closed position and at the same time the rotational speed of the engine is higher than a predetermined value which is higher than an idling speed of the engine.
- Assignee:
- Honda Giken Kogyo K.K., Tokyo
- Patent Number(s):
- US 4700679
- OSTI ID:
- 5977890
- Country of Publication:
- United States
- Language:
- English
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Method of controlling intake air quantity for internal combustion engines at idle
Method of controlling intake air quantity for internal combustion engines