Disclosed is a fuel injection system, in particular a common rail system, for fuel delivery in internal combustion engines, in particular diesel engines of commercial vehicles, with a low pressure circuit in which at least one low-pressure feed pump supplies fuel from a fuel tank to a high-pressure
Disclosed is a fuel injection system, in particular a common rail system, for fuel delivery in internal combustion engines, in particular diesel engines of commercial vehicles, with a low pressure circuit in which at least one low-pressure feed pump supplies fuel from a fuel tank to a high-pressure pump which supplies the highly pressurized fuel to a central high-pressure fuel reservoir. In order to simplify the ventilation of the low-pressure circuit, a device is provided for intentionally decreasing the pressure in the low-pressure circuit.
대표청구항▼
1. In a fuel injection system, in particular a common rail system, for fuel delivery in internal combustion engines, with a low pressure circuit (1-9) in which at least one low-pressure feed pump (5, 7) supplies fuel from a fuel tank (1) to a high-pressure pump (10) which supplies the highly pressur
1. In a fuel injection system, in particular a common rail system, for fuel delivery in internal combustion engines, with a low pressure circuit (1-9) in which at least one low-pressure feed pump (5, 7) supplies fuel from a fuel tank (1) to a high-pressure pump (10) which supplies the highly pressurized fuel to a central high-pressure fuel reservoir (17), the improvement comprising pressure reducing means for intentionally decreasing the pressure in the low-pressure circuit (1-9), wherein the low-pressure circuit (1-9) is connected to the tank (1) by means of a return line (24, 25) which contains a throttle (27), and the throttle (27) is integrated into a check valve (26) which is provided in the return line (25). 2. In a fuel injection system, in particular a common rail system, for fuel delivery in internal combustion engines, with a low pressure circuit (1-9) in which at least one low-pressure feed pump (5, 7) supplies fuel from a fuel tank (1) to a high-pressure pump (10) which supplies the highly pressurized fuel to a central high-pressure fuel reservoir (17), the improvement comprising pressure reducing means for intentionally decreasing the pressure in the low-pressure circuit (1-9), wherein said pressure reducing means include a venting bore (34) with a vent screw which is disposed at the highest point of the low-pressure circuit (1-9) after assembly of the system. 3. The fuel injection system according to claim 2, wherein the venting screw has a flattening in the thread region, which permits fuel to pass through the venting bore (34) when the venting screw is turned slightly. 4. In a fuel injection system, in particular a common rail system, for fuel delivery in internal combustion engines, with a low pressure circuit (1-9) in which at least one low-pressure feed pump (5, 7) supplies fuel from a fuel tank (1) to a high-pressure pump (10) which supplies the highly pressurized fuel to a central high-pressure fuel reservoir (17), the improvement comprising pressure reducing means for intentionally decreasing the pressure in the low-pressure circuit (1-9), wherein the high-pressure pump (10) is equipped with a quantity regulating valve (19) that has a solenoid valve (22) which, when supplied with current, opens a connection between the low-pressure circuit (1-9) and a return (24) into the tank (1).
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이 특허에 인용된 특허 (11)
Ulrich Augustin DE; Reda Rizk DE; Raimondo Giavi DE, Configuration and method for amplifying the pressure of fuel for a fuel injector.
Arnold Bernhard,DEX ; Eisenbacher Egon,DEX ; Pawellek Franz,DEX, Control for a fluid pressure supply system, particularly for high pressure in a fuel injection system.
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