| 摘要 |
PURPOSE:To prevent affection due to a high-land and evaporated fuel upon compensation of the air-fuel ratio of an engine, by compensating a basic fuel injection time-period in accordance with learning compensating coefficients for compensation and a feed-back compensating coefficient to obtain a final fuel injection time-period. CONSTITUTION:A control circuit 22 compensates a basic fuel injection time-period in accordance with learning compenating coefficients for compensation and a feed-back compensating coefficient to obtain a final fuel injection time-period tau which is calculated by the following expression: tau=TPXFAFXFGXK, where TP is the basic fuel injection time-period which may be obtained in accordance with the amount of intake-air and the engine rotational speed, and FAF is the feed-back compensating coefficient which is set in accordance with an air-fuel signal. Further the learning compensating coefficient FG is determined by the following expression: FG=(1+FHAC+DFC/Q), where FHAC is a learning compensating coefficient for altitude compensation, DFC is a learning compensating coefficient for compensation of blocking of an air- flowmeter, and Q is an intake-air amount. With this arrangement, if the throttle valve is not fully closed, a judged value to which an initial value is set along with the starting of the engine, is compared with an averaged value to carry out predetermined addition and subtraction. With this arrangement the compensation of the air-fuel ratio of the engine may be prevented from being affected due to a high-land and evaporated fuel. |
