Patent ID: 9624889
Date: 2017-04-18
CPC Classifications: F02D,F02M

Claim:
1. An apparatus for controlling a rail pressure of a high-pressure common-rail tube cavity of a high-pressure common-rail fuel system of an engine, characterized in that the apparatus comprises: an operation condition acquiring device programmed to acquire operation conditions associated with the high-pressure common-rail fuel system of the engine; a fuel quantity metering valve equivalent cross-sectional area determining device coupled to the operation condition acquiring device and programmed to determine a target equivalent cross-sectional area of the fuel quantity metering valve by using a linear physical model of fuel quantity metering valve equivalent cross-sectional area based on the acquired operation condition and a target value of the rail pressure of the high-pressure common-rail tube cavity, wherein the linear physical model is generated by modeling a flow of a flow metering unit, a plunger pump cavity pressure, a flow from the plunger pump cavity to the high-pressure common-rail tube cavity, the rail pressure of the high-pressure common-rail tube cavity, and a flow injected by a fuel injector to a cylinder; a signal generating device coupled to the fuel quantity metering valve equivalent cross-sectional area determining device and programmed to generate a driving signal for controlling an actual equivalent cross-sectional area of the fuel quantity metering valve based on the determined target equivalent cross-sectional area.