Electronically controlled fuel injection system for rotary engines

An electronic system for electronically controlling fuel injection valves to inject an desired amount of fuel into an intake pipe of a rotary combustion engine under all continuously variable engine operating conditions. In this system, there are mounted on the intake pipe a plurality of fuel injection valves which are sequentially actuated in response to command pulse signals having a pulse width representing a proper duration for fuel injection per one revolution of an engine crank shaft and corresponding at all times to prevailing engine operating conditions, so that the fuel injection valves alternate in their fuel injection operation. The command pulse signals occur sequentially in dependence on the revolution of the engine crank shaft.