| 摘要 |
PURPOSE:To stabilize the control system and to improve the responsive performance by providing an insensitive area, in which the negative pressure and the air pressure solenoids are not operated, to the neighborhood of the point at which both outputs of the throttle opening extent and the negative pressure sensor coincide with each other. CONSTITUTION:Output voltage Vq of the negative pressure sensor is applied to the input terminal 20 and output voltage VT of the throttle sensor is done to the terminal 21. Both the output voltages Vq, VT are compared with each other by the comparator 22. The transistor 23 is turned on or off by an output of the comparator 22, the negative pressure solenoid valve 9 is operated (open) when the transistor is turned on. Also the air pressure solenoid valve 10 is operated (open) when the transistor 26 is turned on. An insensitive area can be provided to control the negative pressure by setting a suitable comparing level in both the comparators. |
