| 摘要 |
PURPOSE:To eliminate the generation of unevenness in air fuel ratio of an engine, by providing a holding means which holds an off-set value in response to a stopper switch detecting the fully closed degree of throttle opening. CONSTITUTION:An opening sensor 2 detecting an opening of a throttle valve 1 and a stopper switch 4 detecting the fully closed degree of throttle opening are provided. During the time under an idle operation condition, as the throttle opening is positioned in the fully closed degree, the switch 4 is placed in a closed condition and an analog switch 5 is placed in a conduction state. In consequence, an output signal (b) of a low pass filter 6 becomes equal to an off-set value Po of the sensor 2. Then if in an acceleration condition, the switch 5 is placed under a cut off state, and the output signal (b) of the filter 6 holds the off-set value Po. The off-set value Po is not contained in a difference signal C output from a subtractor 8, then unevenness is not existent in each throttle opening and unevenness is never caused also in air fuel ratio of an engine. |
