Claims
- 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).
Priority Claims (1)
Number |
Date |
Country |
Kind |
199 54 695 |
Nov 1999 |
DE |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a 35 USC 371 application of PCT/DE 00/03797 filed on Oct. 27, 2000.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/DE00/03797 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO01/36809 |
5/25/2001 |
WO |
A |
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO 0020753 |
Apr 2000 |
WO |