There are three parameters of fuel injection system: response pressure, injection-advanced angle, injection valve bulge high degree, the best match was found by adjusting them.

The principle, structure and parameters of the solenoid valve used to control the fuel injection timing of VE pump are described. The control method and circuit are studied.

That the optimum fuel injection timing corresponding to one operating mode of engine is determined by adjusting the solenoid valve can improve economy and power, and lower the emissions of engine.