Fuel injection system

Claim 1

A fuel injection system for mixture-compressing internal combustion engines with externally-supplied ignition, having controlable fuel metering valves disposed in a fuel supply line for controlably metering a fuel quantity to separate cylinders of said engine which is proportional to the air quantity aspirated by the engine, further wherein said fuel metering occurs at a constant pressure difference which is variable in accordance with operational characteristics of said engine, further having a regulating valve provided with movable valve elements disposed downstream of each fuel metering valve, said movable valve elements dividing said regulating valve into a fuel supply chamber which is connected with said metering valve and a fuel control chamber connected with a control pressure line and arranged to control said pressure difference at each fuel metering valve, each said fuel supply chamber of said regulating valve being exposed to fuel pressure downstream of the associated metering valve and said fuel control chamber of said regulating valve being exposed to pressure in a control pressure line connected to said control chamber of each of said regulating valves, said control pressure line being pressure limited on a fuel supply end by a control throttle connected to said fuel supply line and on a fuel return end by a control pressure valve disposed downstream of said control chamber, said control pressure line communicating via said control throttle with said fuel supply line, an electromagnetic valve connected in said control pressure line operative in response to control signals, characterized in that pressure in said control pressure line can be influenced by operation of said electromagnetic valve, by means of control signals characterizing engine overrunning so that the regulating valves close and fuel injection is interrupted due to fuel pressure resulting from operation of said electromagnetic valve.