Patent ID: 6948480
Filing Date: 2005-09-27
Classification: F02D,F02M

Abstract:
1. An injection system for an internal combustion engine, comprising: a reciprocating pump, a pressure accumulator, a sensor for detecting the pressure in the pressure accumulator, a control valve, and a control unit or regulation unit, wherein the control unit or regulation unit regulates the pressure in the pressure accumulator by releasing or sealing a passage to a low-pressure area by means of the control valve, the control unit or regulation unit executes an emergency operation in the event of a fault in the regulator circuit, the control valve is positioned between a low-pressure area and the pressure accumulator, said valve is connected to the pressure accumulator via a line, a non-return valve for preventing fuel flowing back from the pressure accumulator is positioned in the line in front of the pressure accumulator, the reciprocating pump is positioned between the control valve and the non-return valve, the control valve includes a valve-closing member which opens a passage proceeding from the low-pressure area in the direction of the pressure accumulator, for an emergency operation the control unit or regulation unit de-energizes a coil of the control valve in the event of a fault in the regulator circuit for regulating the pressure in the pressure accumulator in order to keep the valve-closing member free-moving, and the reciprocating pump builds up pressure in the line on completion of a take-in stroke so that the passage of the control valve is sealed by means of the valve-closing member and fuel is conveyed into the pressure accumulator.