Electromagnetic fuel injection control system for internal combustion engines

Claim 1

In an electromagnetic fuel injection control system for internal combustion engines having fuel injection valves which are energized on reception of first and second output pulses respectively from a first and a second monostable circuit, said first monostable circuit being arranged to receive trigger pulses related to the speed of rotation of the engine, said first output pulse having a variable pulse length, said second monostable circuit having its time of operation controlled by said first output pulses, the improvement comprising: A. a third monostable circuit connected to receive the first output pulses from said first monostable circuit to generate third output pulses from the third monostable circuit, B. a first capacitor charging and discharging circuit further comprising: B1. a logical circuit connected to receive said third output pulses and said second output pulses for logically combining the second and third output pulses to produce a waveform, and B2. means responsive to said waveform for controlling the charging and discharging of a first capacitor, thereby producing an output voltage, and C. a second capacitor charging and discharging circuit further comprising: C1. a fourth monostable circuit for receiving said first output pulses for generating fourth output pulses, and C2. means responsive to said fourth output pulses for controlling the charging and discharging of a second capacitor for generating a pulse signal which varies in length as a function of the fourth output pulses.