This invention relates to an apparatus for control of a throttle valve of an internal combustion engine mounted in a motorcar or the like.
There has been hitherto known an apparatus for controlling a throttle valve which includes a first stopper means for stopping a closing movement of a throttle valve at an idling position thereof. The throttle valve is provided in the intake passage of the engine. The known apparatus also includes means for removing the first stopper means from operation at the time of deceleration. At operation of the means for removing, the throttle valve is allowed to move further in its closing direction beyond the idling position to a closed-valve position. At the closed-valve position, the throttle valve is stopped by a second stopper means. In this manner, the amount of fuel consumption decreases at the time of deceleration to effect an improved fuel economy. This type of apparatus, however, has a problem in that at the time of deceleration from a high load operation with the throttle valve being widely open, the return of the throttle valve from its wide open position directly to a closed-valve position thereof produces a large shock on the second stopper means. This increases wear of the same and the durability thereof is lowered.