| 摘要 |
PURPOSE:To prevent an air-fuel ratio from being excessively thinned, by a method wherein during cold down, acceleration, or thinning of an air-fuel ratio, the upper limit value of an air bleed amount is reduced. CONSTITUTION:An air bleed amount control valve 7 is mounted to a carburetter 1, and control is effected by means of a control circuit 8. Singlas from various sensors 9-13 are inputted to the control circuit 8, and upper and lower limit values Imin and Imax1 of an air bleed amount are set by means of a first guard circuit 83. When it is detected that an engine is in a cold down state, on acceleration state, or a thinned state of an air fuel ratio, a second guard circuit 84 is actuated, and the upper limit value is set to Imax2 lower than the Imax1. This constitution enables prevention of an air-fuel ratio from being excesively thinned during cold down.
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