Abstract:
A fuel supply device for internal combustion engines wherein the temperature of the fuel fed to an injection pump can be regulated in order to avoid temperature influences on the fuel metering operation. For this purpose, fuel is withdrawn in a controlled quantity via a temperature-controlled valve from the intake chamber of the injection pump, where the fuel is under the feed pressure of a fuel feed pump and the withdrawn fuel is fed, either by way of a heat exhchanger or directly back to the intake side of the fuel feed pump. In this arrangement, the inherent fuel heating process taking place in the fuel injection pump is exploited to regulate the temperature of the fuel fed to the fuel feed pump.
Abstract:
A fuel injection system utilized with an engine having pre-combustion chambers, main combustion chambers, a fuel metering and quantity distribution valve, a suction tube and an air measuring member are described in further detail hereinafter. The fuel metering and quantity distribution valve has a control slide member which is controlled in its displacement by the air measuring member. The control slide member controls the fuel metered to the engine. The fuel metering and quantity distribution valve has a first differential pressure valve associated therewith which maintains the pressure difference between the fuel pressure prevailing upstream and downstream of the fuel metering location constant during injection. Structure is provided to change the pressure difference in dependence on engine parameters.
Abstract:
A fuel injection system for externally ignited internal combustion engines including fuel injection nozzles, a fuel distributor unit, a fuel supply circuit, and a control pressure circuit. The distributor unit includes metering valves, pressure valves and a first throttle which separates the fuel supply circuit from the control pressure circuit. At least one of the pressure valves is embodied as a differential pressure control valve which has one chamber connected to the first throttle and the control pressure circuit. The control pressure circuit includes the above-mentioned chamber of the differential pressure control valve, a magnetic valve, a storage element and a second throttle. With the system noted, the pressure difference across the metering valves may be varied by varying the pressure difference across the first throttle by means of the magnetic valve via the storage element and the second throttle.