초록 ▼

The fuel injection device has a high-pressure pump (14) that supplies fuel to a reservoir and is connected to injectors disposed in the cylinders of the engine. A fuel-supply pump delivers fuel from a fuel tank to the suction side of the high-pressure pump. An electrically actuated control valve adj

The fuel injection device has a high-pressure pump (14) that supplies fuel to a reservoir and is connected to injectors disposed in the cylinders of the engine. A fuel-supply pump delivers fuel from a fuel tank to the suction side of the high-pressure pump. An electrically actuated control valve adjusts the quantity of fuel that the high-pressure pump delivers to the reservoir. The control valve is disposed on the pressure side of the high-pressure pump and can be switched between a first position, in which the pressure side of the high-pressure pump is closed off from a pressure relief region, and a second position, in which the pressure side of the high-pressure pump is connected to the pressure relief region.

대표청구항 ▼

1. A fuel injection device for an internal combustion engine, the device comprisinga high-pressure pump (14; 114; 314) that supplies fuel to a reservoir (16) connected to injectors (18) disposed in the cylinders of the engine, a fuel-supply pump (10) that delivers fuel from a fuel tank (12) to the s

1. A fuel injection device for an internal combustion engine, the device comprisinga high-pressure pump (14; 114; 314) that supplies fuel to a reservoir (16) connected to injectors (18) disposed in the cylinders of the engine, a fuel-supply pump (10) that delivers fuel from a fuel tank (12) to the suction side of the high-pressure pump (14; 114; 314), an electrically actuated control valve (54; 254; 354; 454; 554; 654) for adjusting the quantity of fuel that the high-pressure pump (14; 114; 314) delivers to the reservoir (16), the control valve (54; 254; 354; 454; 554; 654) being disposed on the pressure side of the high-pressure pump (14; 114; 314), and means for switching the control valve (54; 254; 354; 454; 554; 654) between a first switched position, in which the pressure side of the high-pressure pump (14; 114; 314) is closed off from a pressure relief region, and a second switched position, in which the pressure side of the high-pressure pump (14; 114; 314) is connected to the pressure relief region, wherein the control valve (54) is embodied as a 3/2-way valve, which, in a first switched position, connects the pressure side of the high-pressure pump (14) to the reservoir (16) and closes it off from the pressure relief region, and in a second switched position, connects the pressure side of the high-pressure pump (14) to the pressure relief region and closes it off from the reservoir (16). 2. The fuel injection device according to claim 1, wherein the pressure relief region comprises a return (46; 346), which leads at least indirectly into the fuel tank (12) or to the suction side of the fuel-supply pump (10).3. The fuel injection device according to claim 1, wherein the pressure relief region is the suction side of the high-pressure pump (314).4. A fuel infection device for an internal combustion engine, the device comprisinga high-pressure pump (14; 114; 314) that supplies fuel to a reservoir (16) connected to injectors (18) disposed in the cylinders of the engine, a fuel-supply pump (10) that delivers fuel from a fuel tank (12) to the suction side of the high-pressure pump (14; 114; 314), an electrically actuated control valve (54; 254; 354; 454; 554; 654) for adjusting the quantity of fuel that the high-pressure pump (14; 114; 314) delivers to the reservoir (16), the control valve (54; 254; 354; 454; 554; 654) being disposed on the pressure side of the high-pressure pump (14; 114; 314), and means for switching the control valve (54; 254; 354; 454; 554; 654) between a first switched position, in which the pressure side of the high-pressure pump (14; 114; 314) is closed off from a pressure relief region, and a second switched position, in which the pressure side of the high-pressure pump (14; 114; 314) is connected to the pressure relief region, wherein the high-pressure pump (114) comprises a number of pump elements (130) disposed distributed uniformly around a common axis (131), each said pump element having a pump piston (134) guided in a cylinder bore (132) to define a pump working chamber (138), and is set into a stroke motion, the pump working chambers (138) of the pump elements (130) being disposed opposite one another, oriented toward the common axis (131), and a connection (15) from the pressure side of the high-pressure pump (114) to the reservoir (16). 5. The fuel injection device according to claim 1, wherein the high-pressure pump (114) comprises a number of pump elements (130) disposed distributed uniformly around a common axis (131), each said pump element having a pump piston (134) guided in a cylinder bore (132) define a pump working chamber (138), and is set into a stroke motion,the pump working chambers (138) of the pump elements (130) being disposed opposite one another, oriented toward the common axis (131), and a connection (15) from the pressure side of the high-pressure pump (114) to the reservoir (16). 6. The fuel injection device according to claim 1, wherein, when not activated, the control valve assumes its first switched position in which the pressure side of the high-pressure pump (314) is closed off from the pressure relief region, and when activated, the control valve assumes its second switched position in which the pressure side of the high-pressure pump (314) is connected to the pressure relief region.7. The fuel injection device according to claim 4, wherein, when not activated, the control valve assumes its first switched position in which the pressure side of the high-pressure pump (314) is closed off from the pressure relief region, and when activated, the control valve assumes its second switched position in which the pressure side of the high-pressure pump (314) is connected to the pressure relief region.8. The fuel injection device according to claim 1, further comprising a check valve (570), which opens toward the pressure relief region and is connected in series with the control valve (554).9. The fuel injection device according to claim 4, further comprising a check valve (570), which opens toward the pressure relief region and is connected in series with the control valve (554).10. The fuel injection device according to claim 6, further comprising a check valve (570), which opens toward the pressure relief region and is connected in series with the control valve (554).11. A fuel injection device for an internal combustion engine, the device comprisinga high-pressure pump (14; 114; 314) that supplies fuel to a reservoir (16) connected to injectors (18) disposed in the cylinders of the engine, a fuel-supply pump (10) that delivers fuel from a fuel tank (12) to the suction side of the high-pressure pump (14; 114; 314), an electrically actuated control valve (54; 254; 354; 454; 554; 654) for adjusting the quantity of fuel that the high-pressure pump (14; 114; 314) delivers to the reservoir (16), the control valve (54; 254; 354; 454; 554; 654) being disposed on the pressure side of the high-pressure pump (14; 114; 314), and means for switching the control valve (54; 254; 354; 454; 554; 654) between a first switched position, in which the pressure side of the high-pressure pump (14; 114; 314) is closed off from a pressure relief region, and a second switched position, in which the pressure side of the high-pressure pump (14; 114; 314) is connected to the pressure relief region, further comprising an additional valve (672) controlled by the pressure prevailing in the reservoir (16) and connected in series with the control valve (654), the additional valve (672) assuming a first open switched position when there is high pressure in the reservoir (16) to open the connection (626) of the pressure side of the high-pressure pump (314) to the pressure relief region, and a second closed position when there is low pressure in the reservoir (16) to close the connection (626) of the pressure side of the high-pressure pump (314) to the pressure relief region. 12. The fuel injection device according to claim 1, further comprising a check valve (256; 356; 556) in the connection (15) between the pressure side of the high-pressure pump (214; 314) and the reservoir (16), the check valve (256; 356; 556) opening toward the reservoir (16).13. A fuel injection device as recited in claim 4, wherein the connection branches off in the vicinity of the common axis (131).14. A fuel injection device as recited in claim 5, wherein the connection branches off in the vicinity of the common axis (131).