关键词: 内燃机, 柴油机, 燃油系统, 压力控制, PID控制

Abstract: The fuel injection pressure rests with the pressure in the common rail of common rail fuel injection system.The performance of system is influenced severely by the adjustment and stability of rail pressure depending on certain operating condition.A fuzzy PID is designed；the technologies of integrator separateness and pre-control for high pressure governing are added；the control strategy and realizing means are introduced.The optimal rail pressure control under different conditions is realized by online adjustment of PID control parameters.The bench test results show that the common rail pressure should increase with adding of engine speeds and injection quantity；governor parameters of PID should be chosen bigger value in high engine speed；a pre-control for high pressure governing based on the operating point is used to reduce delay time and to keep the governor deviation small；the pressure in common rail is kept at an almost constant value which fluctuation range is no more than 1.7% by the recommended control strategy and means.

Key words: IC engine, diesel engine, fuel injection system, pressure control, PID control