Abstract: A throttle valve opener for a throttle valve in the intake passage of a vehicle engine is actuated by suction pressure from the intake passage, the suction pressure being weakened by introduction of atmospheric air during certain operating conditions of the engine. Suction pressure for operating the throttle valve opener is cut off when the vehicle speed or the engine RPM exceed predetermined values, or when the engine's cooling water temperature rises above a predetermined limit. This system controls deceleration of the engine to reduce exhaust pollutants without adverse effects on the drivability of the vehicle.

Abstract: In an engine system including an internal combustion engine and an exhaust turbine supercharger, a valve stop mechanism is provided to stop the throttle valve of the engine in an angular position anterior to the idle position thereof when the throttle valve is suddenly moved toward the idle position in the presence of an air pressure higher than a predetermined value in the air induction passageway of the engine downstream of the compressor unit of the supercharger and upstream of the throttle valve of the engine so as to preclude production of pressure surges in exhaust turbine supercharger.

Abstract: In an internal combustion engine with a carburetor control device, a throttle valve of the carburetor is arranged in the intake port which is defined by the cylinder block of the engine and a control linkage is established between the crankshaft and the throttle valve in order to control the speed of the throttle valve in accordance with a set value. The connection linkage is arranged in the interior of the crankcase and extends completely within the cylinder block and the crankcase interior.

Abstract: A throttle valve opening control device for an internal combustion engine operative to control the opening of a throttle valve by supplying a signal based on the results of feeding of operation parameters of the internal combustion engine into a computer to a throttle valve actuator comprising an initial stage speed reducing gear secured to a DC motor, and a final stage speed reducing gear for driving an output shaft for opening and closing the throttle valve. The initial stage speed reducing gear and the final stage speed reducing gear are located on the same axial line, and a side of the initial stage speed reducing gear opposite the side thereof at which the DC motor is secured is in bearing relation to the final stage speed reducing gear.

Abstract: A speed control for an engine having a throttle and a drive shaft made up of a selective gear connected to a differential gear and a responsive gear connected to a second differential gear all rotatable about a common axis. Two differential pinions rotatably connected to the differential gears and supported on a pinion shaft disposed at right angles to the axis. The center of the pinion shaft being attached to a drum mounted concentric to the axis and having an actuating member connected from the drum to the engine throttle and a reference motor operatively connected to the first side gear to drive it at a selected speed and a drive shaft from the engine driving the second side gear.

Abstract: A fuel supply system for supplying fuel and for satisfactorily preparing the fuel-air mixture fed to a mixture-compressing, spark-ignited internal combustion engine which comprises an arbitrarily operable throttle element arranged in the air intake manifold wherein fuel can be supplied upstream of this throttle element. The throttle element is mounted on a rocking lever connected to a bearing shaft arranged outside of the air flow at the air intake manifold and is displaceable in the opening direction during full load and at higher speeds against the force of a compensating spring until the throttle element comes into contact, with a full-load stop, with the rocking lever. During full load and at low speeds, the compensating spring displaces the throttle element in the closing direction so that a rather large pressure drop occurs at the throttle element so that an improved conditioning of the injected fuel is obtained.