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US 5,655,500 AGranted
Control sensors for fuel-injected engine
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorMasahiko Kato
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AssigneeSanshin Kogyo Kabushiki Kaisha
InventorMasahiko Kato
Estimating the term…
A fuel-injected engine produces improved performance while reducing hydrocarbon emissions through the use of several control sensors. One of the sensors, a throttle sensor, determines an opening degree of the throttle valves of the engine and transmits this information to an electronic control unit. A unique coupling ensures unitary movement of a shaft of the sensor with the throttle valve to precisely measure the opening degree and to minimize mechanical hysteresis in the sensed position of the throttle valve as the valve opens and closes. The electronic control unit in turn adjusts the amount of fuel injected depending upon the opening degree of the throttle valves. The amount of injected fuel also depends upon the atmospheric pressure to which the engine is subject. A high-pressure fuel delivery circuit includes a fuel pressure regulator that regulates the fuel pressure at the fuel injectors of the engine. The pressure regulator includes an altitude compensator that adjusts the amount of pressure at fuel injectors according to the atmospheric pressure sensed in the intake manifold. By controlling the opening time of the fuel injectors and the fuel pressure at the injectors, the engine control unit can precisely control the fuel/air mixture delivered to the combustion chambers of the engine to improve engine performance and reduce hydrocarbon emissions.
An engine comprising an induction system including at least one throttle device, said throttle device comprising a throttle shaft that rotates to establish an opening degree of the throttle device, and a sensor comprising a rotatable sensor shaft and a coupling which interconnects said sensor shaft to said throttle shaft such that said sensor shaft rotates with said throttle shaft in a unitary manner, said coupling comprising a driver attached to the throttle shaft and a follower attached to the sensor shaft, said driver and said follower including interengaging elements which connect said follower to said driver such that said follower rotates with said driver, and a biasing member provided between said driver and said follower to bias said follower to follow rotational movement of said driver.
An engine comprising an induction system including a plurality of throttle devices interconnected by a linkage system, each throttle device comprising a throttle shaft that rotates to establish an opening degree of the corresponding throttle device, a throttle sensor having a rotatable sensor shaft, and means for transferring reciprocating rotational movement of one of said throttle shafts to said sensor shaft without producing mechanical hysteresis.
A coupling between a sensor and an operator of an engine control device which moves between at least two positions, said coupling comprising a driver attached to the operator and a follower attached to the sensor, said follower and said driver cooperating with each other to transfer movement of the operator to the sensor, and a biasing member provided between said driver and said follower to bias said follower to follow movement of said driver.
An engine comprising an induction system including a plurality of intake passages and at least one fuel injector which communicates at an injection point with at least a first intake passage of said plurality of intake passages, and a fuel delivery system communicating with said fuel injector, said fuel delivery system including a pressure regulator which communicates with at least said first intake passage at the point of injection.
Dependencies are inferred from the claim text.