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公开(公告)号：US5740783A
公开(公告)日：1998-04-21
申请号：US749448
申请日：1996-11-15
CPC分类号： F02M37/08 , F02D41/3082 , F02M2037/085
摘要： A fuel delivery system and method for providing fuel to a fuel injected engine using an engine control unit (ECU) to determine engine fuel demand and adjust fuel pump operation accordingly to supply at least as much fuel as demanded by the engine. The ECU determines a fuel pump control signal based upon fuel demand and applies the signal to a fuel pump driver that controllably drives the pump in response to the control signal. The ECU determines fuel demand by monitoring engine operation and calculates a control signal that controls the duration of time the fuel injector stays open during an upcoming intake stroke of engine operation. The pump control signal is proportional to engine fuel demand multiplied by a constant that ensures more fuel will be available for delivery to the injector than demanded by the engine. Engine fuel demand is proportional to the duration of time the injector will stay open multiplied by the engine speed. Preferably, if the calculated pump signal is less than a minimum that would cause the pump to operate below a desired minimum duty cycle, the control signal is set at the minimum to ensure sufficient excess fuel will be available to meet any sharp increases in demand. If the calculated signal is greater than the maximum pump duty cycle, the signal is set at the maximum to avoid damaging the pump. If the calculated signal is between the minimum and maximum limits, the control signal is set to the calculated value.
摘要翻译： 一种燃料输送系统和方法，用于使用发动机控制单元（ECU）向燃料喷射发动机提供燃料，以确定发动机燃料需求并相应地调节燃料泵运行，从而至少提供与发动机所要求的燃料一样多的燃料。 ECU基于燃料需求来确定燃料泵控制信号，并将该信号应用于响应于控制信号可控制地驱动泵的燃料泵驱动器。 ECU通过监控发动机运转来确定燃料需求，并计算控制信号，该控制信号控制在即将到来的发动机运行进气冲程期间燃料喷射器保持打开的持续时间。 泵控制信号与发动机燃料需求成比例乘以一个常数，确保更多的燃料可用于发动机所需的发动机。 发动机燃料需求与喷油器保持打开的持续时间乘以发动机转速成比例。 优选地，如果所计算的泵浦信号小于将导致泵在期望的最小占空比下运行的最小值，则将控制信号设置为最小以确保足够的过量燃料将可用于满足任何急剧增加的需求。 如果计算出的信号大于最大泵的占空比，则信号被设置为最大值，以避免损坏泵。 如果计算出的信号在最小和最大极限之间，则将控制信号设置为计算值。
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