Abstract:

The effects of the fuel injection pulse width, the ignition advance angle and the parameters of engine start PID controller on the engine starting behavior was researched on a turbocharged gasoline direct injection engine with the selfdeveloped software and hardware of the engine control system. The test results showed that the fluctuation of the engine starting speed is small when the fuel injection pulse width is  45 ℃A. The engine starting torque is the maximum for the ignition advance angle 12 ℃A. The optimal parameters of the PID control system are as follows: the speed responses quickly at  K_P=1; the errorfree speed tracking and the small overshoot are reached at K_I=0.2; and the control time is short and the speed becomes steady quickly at K_D=1.

Key words: power machinery and engineering, gasoline direct injection(GDI) engine, ignition timing, injection pulse width, engine start PID controller