Abstract: An apparatus for controlling a throttle valve situated for rotation within an engine induction passage. The apparatus includes a throttle driving unit mechanically coupled to the accelerator pedal for rotating the throttle valve in response to an extent to which the accelerator pedal is depressed. A control circuit is provided for producing an electrical control signal in accordance with automobile running conditions. The control signal is applied to a throttle actuator which thereby produces a driving force to the throttle driving unit for rotating the throttle valve. The throttle driving unit has a structure for restricting rotation of the throttle valve in an opening direction to a degree determined by the extent to which the accelerator pedal is depressed so as to provide a positive prevention of automobile reckless driving.

Abstract: Two parallelly arranged proportioning valve assemblies are installed in a housing. The assemblies have respective plungers which are movable against a common spring to slacken the rise of the hydraulic pressure issued from the assemblies with respect to that of the hydraulic pressure fed in the same. A deceleration sensing valve assembly is also installed in the housing so as to regulate the magnitude of a load applied to the common spring in accordance with the degree of deceleration of the vehicle.