Fuel injection system for internal combustion engines

Claim 1

A fuel injection system for internal combustion engines comprising: circuit means for generating an engine starting control voltage, said control voltage varying according to the fuel control pattern required for cold starting of an engine, said engine starting control voltage being relatively high for low engine speeds, circuit means for generating a full-load engine operating control voltage, said control voltage varying according to the fuel control pattern required for a full-load operation of the engine, said full-load control voltage being relatively low for high engine speeds, wherein as the speed of said engine increases to full-load operation, said engine starting control voltage decreases to said full-load control voltage, a selecting circuit responsively coupled to each of said aforementioned circuit means for selecting the higher one of the control voltages generated by said control voltage generating circuit means, a monostable timing pulse generator connected to said selecting circuit for providing timing pulses having a pulse duration corresponding to the selected control voltage, and a fuel injection pump responsive to sAid timing pulses having an electromagnetic valve to control the quantity of fuel discharged from said fuel injection pump in each cycle thereof in accordance with the pulse duration of the timing pulse delivered from the timing pulse generator, said engine starting control voltage generating means including means for changing the control voltage in response to a selected condition of engine operation.