| 摘要 |
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.
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