Robert Boschgmbh

Volkmar Kern

Hans-Christoph Magel

Achim Brenk

Christoph Magel

Goran Kanis

An apparatus for injecting fuel into an internal combustion engine having a fuel injector acted on with highly pressurized fuel actuated by means of a metering valve device that is able to control the pressure in a pressure booster control chamber so that in a pressure booster pressure chamber delimited by a pressure booster piston which can be filled via a check valve with high-pressure fuel and communicates with an injection valve member pressure chamber, the pressure booster piston increases the pressure, causing an injection valve member for injecting fuel to open. To assure a correct injection quantity even if an abrupt pressure drop occurs in the high-pressure fuel source, the pressure booster piston is situated and designed so that if a pressure drop occurs in the high-pressure fuel source, then starting from its neutral position, the pressure booster piston has the capacity to execute a pressure compensation movement by means of which the pressure in the pressure booster pressure chamber is adapted to the pressure of the high-pressure fuel source.

Fuel injection apparatus

A fuel injection system for internal combustion engines, having a fuel injector that can be supplied from a high-pressure fuel source, wherein a pressure booster that is connected between the fuel injector and the high-pressure fuel source, and a pressure booster are proposed, in which a movable piston of the pressure booster divides a room that is connected to the high-pressure fuel source from a high-pressure chamber, communicating with the injector, and from a rear chamber, and the high-pressure chamber can be made to communicate with the rear chamber via a fuel line, so that the high-pressure chamber can be filled with fuel via the rear chamber.

Fuel injectiony system with pressure booster, and pressure booster

A device for injecting fuel into the combustion chamber of an internal combustion engine, a high-pressure accumulator, a pressure booster, and a metering valve. The pressure booster has a working chamber and a control chamber that are separated from each other by an axially moving piston. A pressure change in the control chamber of the pressure booster causes a pressure change in a compression chamber of the pressure booster. The compression chamber communicates with a hydraulic chamber that acts on an injection valve element. The piston that acts on the compression chamber of the pressure booster is provided with control sections that can be used to relieve the pressure in the hydraulic chamber of the injection valve element.

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Stuttgart, Germany

Volkmar Kern