Patent ID: 6729302
Filing Date: 2004-05-04
Classification: F02M

Abstract:
Fuel injection system for an internal-combustion diesel engine, having a fuel injector which is supplied with highly pressurized fuel by way of a common rail high-pressure fuel line for injecting the fuel into the combustion space of the internal-combustion engine during an injection operation, and having a pressure control valve connected in the high-pressure fuel line in front of the fuel injector and downstream of a common rail pressure accumulator for controlling the pressure of the fuel injected during the injection operation,wherein the pressure control valve contains a freely displaceable piston operating on both sides and a slide connected into the flow path of the high-pressure control line for opening and closing the passage cross-section of the flow path of the high-pressure fuel line as a function of the position of the piston, a first pressure space on a forward side of the piston which acts upon the piston in the opening direction of the slide, and a second pressure space on a rearward side of the piston which acts upon the piston in the closing direction of the slide, and wherein an adjusting valve is provided for adjusting the pressures in the first and/or second pressure space in the sense of a displacement of the piston in the opening or closing direction.