| 摘要 |
PURPOSE:To reduce a rate of fuel consumption, by compensating a loss of quantity for closed-loop control on the basis of oxygen content and a fundamental fuel supply determined by the closed-loop control, while selecting open-loop control to determine a final fuel supply according to an operating state. CONSTITUTION:A control unit 36 consisting of a microcomputer or the like reads out an engine speed, suction negative pressure, a suction air quantity, water temperature by a hot wire drive circuit 22, etc., and determines a fundamental fuel supply on the basis of an engine operating state. Then, various compensation operations on water temperature, atmospheric pressure, etc., for this fuel supply are carried out whereby it determines a final fuel supply to secure the desired air-fuel ratio. In addition, closed-loop control by output of an O2 sensor 26 and open-loop control to determine the final fuel supply in a way of setting a something subject to compensation for a loss of quantity of the fundamental fuel supply determined by this closed-loop control are selected according to the engine operating state. With this constitution, fuel consumption is sharply reducible without altering the conventional hard constitution.
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