| 摘要 |
PURPOSE:To stabilize air-fuel ratio control at boundary area between lean and enrich driving conditions by controlling air-fuel ratio on the basis of intake air pressure or intake air amount with a load below the set level as well as of throttle opening with a load over the set level. CONSTITUTION:In a control circuit 1, a lean correction factor is operated by width of injection pulse and engine speed, and so is an enrich correction factor by throttle opening detected by a throttle opening sensor 6 and engine speed. And, final width of injection pulse is operated by multiplying a correction factor including the product of both above correction factors by width of basic injection pulse and adding battery voltage correction thereto and a driving signal is output to a fuel injection valve 16. In a driving area over the set load, the lean correction factor turns to 1 and is switched to the enrich correction factor above 1 based on the throttle opening, and lean air-fuel ratio is gradually shifted to enrich air-fuel ratio at relatively gentle incline with increase of the throttle opening.
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