| 摘要 |
PURPOSE:To obviate the necessity for high-land correction by operating an intake throttle valve by means of a vacuum actuator and controlling said actuator according to the result of comparison between a standard value and a voltage value obtained through the conversion of the signal of the number of revolution of an engine. CONSTITUTION:The operating arm of an intake throttle valve 3 installed in an intake conduit is connected to a vacuum actuator 4 through a rod, and the negative-pressure chamber of said actuator 4 communicates to the air through a solenoid valve 61, and communicates to a vacuum pump 10 through a solenoid valve 62. Each solenoid valve 61, 62 is controlled by a controller 7, which turns- ON a transistor Tr1 when an output voltage V1 which is output from a rotary pick-up 5 through an F/V converter 12 and a BPF13, etc. is higher than the standard voltage V0 of a comparator 151, and controls to allow the solenoid valve 62 to be opened. If V1<V0, a transistor Tr2 is brought into conduction through a comparator 152, and the solenoid valve 61 is opened. |
