SYSTEM FOR CONTROLLING FUEL RAIL PRESSURE IN A COMMON RAIL DIRECT FUEL INJECTION SYSTEM
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United States of America Patent
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Feb 1, 2018
app pub date -
Jul 29, 2016
filing date -
Jul 29, 2016
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Abstract
A system and method are provided for controlling fuel rail pressure in a common rail fuel injection system. A desired rail pressure value is determined based on signals produced by one or more sensors, a feedback PCV control signal is determined based on a difference between the desired rail pressure value and a fuel rail pressure signal, a feedforward PCV signal is determined based on the desired rail pressure value, and a PCV control signal for controlling a pressure control valve fluidly coupled to the fuel rail is determined based on the feedback PCV control signal and the feedforward PCV control signal. The pressure control valve signal is correlated with the temperature of fuel exiting the pressure control valve such that operation of the pressure control valve in response to the PCV control signal results in a valve outlet orifice size which controls the temperature exiting fuel.
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