| 摘要 |
PURPOSE:To smooth the starting-up of the engine torque accompanied by fuel return by ON/OFF controlling the fuel feed and then performing the fuel return in full measure when fuel return is performed at a prescribed number of engine revolution or less in fuel cut control. CONSTITUTION:If the number of engine revolution obtained from the output signal of a crank angle sensor 7 is higher than the number N1 of fuel return revolution, when deceleration state is generated by opening an accelerator during traveling, the outputs of the both comparison circuits 16 and 17 become L, and an OR gate 23 outputs an H signal. Then, a NAND gate 24 where all the input signals become H outputs an L signal, and a slow cut valve 6 is opened. When the number of engine revolution becomes less than N1, the output of the comparison circuit 16 becomes H, and an AND gate 22 is opened, and the valve 6 is opened and closed intermittently by the actions of preset counters 26 and 27. When the number of engine revolution becomes less than N2 (<N1), the output of a NOR gate 23 is made L level by the H signal of the comparison circuit 17, and the valve 6 is opening-held.
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