| 摘要 |
PURPOSE:To prevent overspeed of an engine for the purpose of improving the reliability of car by providing a control circuit for reducing fuel injection quantity when the opening degree of an accelerator and a pressure difference between those at the upper and down stream sides of a throttle valve are related to each other under the specified conditions. CONSTITUTION:Since, when a pressure difference between those at the upper and down stream sides of an intake throttle valve 12a is less than the specified value, a differencial pressure switch 20 becomes ON being caused by contact of a movable contact 20b with fixed contacts 20g and 20d due to the spring force of a spring 20e, an accelerator opening degree sensor is judged to be normal. On the other hand, since, when the negative pressure at the down stream side of the intake suck throttle valve 12a is so much intensified as to have differencial pressure increased over the specified value, the differencial pressure switch 20 becomes OFf being caused by the motion of the movable contact 20b overcoming the spring force of the spring 20e, the accelerator opening degree sensor is judged to be abnormal and the quantity of fuel injection is reduced to the quantity in idling the engine. |
