CONTROLLER FOR THROTTLE VALVE OF INTERNAL COMBUSTION ENGINE

PURPOSE:To accurately control the degree of opening of a throttle valve at cranking in particular, by controlling the operation of a throttle actuator to approximate the detected actual degree of opening of the throttle valve to a desired value corresponding to the temperature of an engine. CONSTITUTION:A throttle actuator 2 is coupled to the shaft of a throttle valve 4 through a lever 3. A throttle sensor 5, which sends out a voltage linearly corresponding to the degree of opening of the throttle valve 4, is also coupled to the shaft of the throttle valve 4. The output signal theta'th of the sensor 5 is entered into a comparator circuit 8 and compared with the output of a signal conversion circuit 7 which shows a desired degree thetath of the throttle valve 4 which corresponds to the output signal Tw of an engine temperature sensor 6. In the case of theta'th>thetath and delta>0 (delta=thetath-theta'th), the actuator 2 is operated in a direction to close the throttle valve 4. In the case of theta'th>thetath and delta>0, the actuator 2 is operated in a direction to open the throttle valve 4. In the case of delta=0, the actuator 2 is stopped.