Series-connection valve speed control system of spark ignition type internal combustion engine

The invention provides a series-connection valve speed control system (SVSC) of a spark ignition type internal combustion engine. An air inlet control system is composed of a front inlet valve and a rear inlet valve which are connected in series, and a throttle valve of a traditional spark ignition type internal combustion engine is omitted. One inlet valve, the same as an inlet valve of an original engine, is of a traditional inlet valve structure and a control mode and is defined as the rear inlet valve. The other inlet valve is defined as the front inlet valve. The opening overlapping angle of the two inlet valves is controlled by controlling the opening time of the front inlet valve, and therefore the air inflow of air entering an engine cylinder is controlled and the purpose of adjusting the engine is achieved. The throttle valve is omitted, the pump gas loss of the engine is reduced, and the economical efficiency of the engine is improved. A computer is used for controlling the opening time of the front