Fuel injection device for internal combustion engines

Claim 1

An injection device for internal reciprocating combustion engines having injection valves mounted in a suction pipe and controllable by electrical impulses for introducing fuel under variable pressure from a fuel supply, comprising; a fuel return line connected to said fuel supply, an adjustable excess pressure valve for controlling the pressure of the fuel from said fuel supply to said injection valves by varying the fuel flow resistance in said fuel return line, a throttle vaLve mounted in said suction pipe, an engine accelerator, means for connecting said throttle valve and said excess pressure valve to said engine accelerator for simultaneous operation of said adjustable pressure valve and said throttle valve with acceleration and deceleration of said engine, electromagnetic valve means mounted in said return line for raising the fuel pressure to said injection valves when operated, switching means actuated by said engine accelerator for operating said valve means only under substantially full acceleration conditions, and a contact device for operating said valve means depending on the r.p.m. of said engine.