The study control strategy of idle stop system

The idle stop technology is one mean to implement zero emissions and zero fuel consumption. Based on the Gasoline Direct Injection engine (GDI) as the research object, the starting physical mechanism is analyzed and the engine starting model is established. The torque, speed and inlet pressure characteristics of engine starting process are analyzed. The influence of the piston stop position and the injection pulse width with injection timing and ignition timing on the engine start speed is researched. The results show that the torque is fluctuation and tends to be stable. The amplitude reaches the maximum, and then it gradually decays to stability. The starting speed in the first stroke injection and ignition is the fastest. And there is a small misfire region when the fuel injection quantity is less and the injection time is advanced.