| 摘要 |
PURPOSE:To prevent white smoke and noise from growing large as well as to aim at reduction in vibrations, by operating an idle fuel injection device at the time of sensing a state of deceleration and reducing a fuel injection quantity to some extent, while letting a device perform an exhaust gas recirculation. CONSTITUTION:During engine operation, on the basis of each detecting signal out of a throttle opening sensor 54, an engine speed sensor 56 and an acceleration sensor 58, when deceleration other than a state of deceleration at the time of speed shifting is detected at an electronic control unit 28, each of suction pressure selector valves 48 and 50 of an idle fuel decrement device 30 is operated by the ECU 28. With this, suction pressure in a suction pressure pump 20 is led into both diaphragm chambers 42A and 42B of an actuator 40, and an idling speed setting lever 38 is rotated in a fuel injection reducing direction by diaphragms 44A and 44B via a rod 46. And, simultaneously a suction pressure selector valve 52 of an EGR operating device 32 is operated, opening an EGR valve 18, and an exhaust gas recirculation is started. |
