Fuel injection system

Claim 1

A fuel injection system for mixture-compressing internal combustion engines with external-supplied ignition having metering valves disposed in a fuel supply line for metering a quantity of fuel which is in a specific ratio to the quantity of air aspirated by the engine, wherein the metering is effected at a pressure difference determined by a regulating valve, said regulating valve having a movable valve element disposed downstream of each of said metering valves and arranged to regulate said pressure difference at each of said metering valves, said movable valve element further arranged to be subjected on the one hand to the fuel pressure downstream of the respective metering valve and a spring and on the other hand to the pressure in a control pressure line, a pressure regulating valve arranged to communicate with said fuel supply line upstream of a pressure-reduction valve, said last named valve disposed in said fuel supply line upstream of said metering valves, said control pressure line communicates with said fuel supply line via at least one control throttle, and at least one electromagnetic valve is provided to influence the pressure in said control pressure line so that at least a portion of said regulating valve closes, and wherein said control pressure line communicates via said control throttle with said fuel supply line downstream of said pressure-reduction valve, further that said regulating valves have control chambers, and wherein said at least one electromagnetic valve comprises a control pressure valve electromagnetically triggerable in accordance with operating characteristics of said engine disposed downstream of said control throttle, and an electromagnetic valve is located in a bypass line around said control throttle and said pressure-reduction valve, said last named valve arranged to open in the presence of specific control signals, in particular those characterizing engine overrunning.