Abstract
In order to shorten rail pressure control strategy development cycle and reduce development costs,modeling and automatic code generation of feed forward control plus proportional-integral-differential(PID) feedback control strategy were completed through the Matlab / Simulink and RTW Embedded Coder kits.For improving the control stability,rail pressure control system was scheduled to sample rail pressure sensor on fixed phase according to the rail pressure fluctuation rules in an engine working cycle.The test results show that rail pressure steady state error is less than 1.5 MPa,maximum overshoot is about 2 MPa or less during pressure step response and settling time is less than 0.5 s,pressure fluctuation is less than ±1.5 MPa under different fuel injection quantities.The control strategy is easy to implement,control accuracy and response performance has met the requirements of common rail pressure control system.
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