Method and apparatus for cooling a fuel injection system
AssigneeRobert Bosch GmbH
InventorsHelmut Rembold, Udo Hafner, Winfried Moser, Matthias Philipp, Klaus Joos, Karl Gmelin, Bernd Herrmann, Volkmar Goldschmitt, Thomas Frenz, Ruediger Weiss, Edmund Schaut, Uwe Mueller, Markus Amler, Hansjoerg Bochum
Life of this patent
Estimating the term…
Abstract
A method for cooling a fuel injection system and fuel injection systems are proposed that improve the hot-starting performance of the internal combustion engine.
Claims24
A method for cooling a fuel injection system for internal combustion engines, having a prefeed pump (1) that pumps fuel from a tank (3) via a feed line (5) into a high-pressure region (7), the high-pressure region (7) including a high-pressure pump (11), a return line (19) for removing excess fuel from the high-pressure region (7), and a connecting line (29), connecting the feed line (5) and return line (19), the flow through the connecting line (29) being controllable by means of a scavenging valve (31), the method comprising,
- closing the scavenging valve (31), if upon turning on the engine a turn-on criterion has been reached;
- scavenging of at least parts of the high-pressure region (7) with fuel from the fuel tank (3);
- and
- opening the scavenging valve (31), as soon as a turn-off criterion is reached.
A fuel injection system for internal combustion engines, comprising a control unit, a prefeed pump (1) that pumps fuel from a tank (3) via a feed line (5) into a high-pressure region (7), the high-pressure region (7) including at least one high-pressure pump (11), a return line (19) for removing fuel from the high-pressure region (7), the return line (19) having a relief throttle (21) and a low-pressure regulator (23), characterized in that a connecting line (29) with a scavenging valve (31) and a mixing line (25) with a check valve (27) are located between the feed line (5) and the return line (19), the mixing line (25) discharging into the return line (19) upstream of the connecting line (29), and the connecting line (29) discharging into the return line (19) upstream of the low-pressure regulator (23).
A fuel injection system for internal combustion engines, comprising a control unit, a prefeed pump (1) that pumps fuel from a tank (3) via a feed line (5) into a high-pressure region (7), the high-pressure region (7) including at least one high-pressure pump (11), a return line (19) for removing fuel from the high-pressure region (7), the return line (19) discharging into the feed line (5), and having a leakage line (35) for removing fuel from the high-pressure region into the tank (3), and a check valve (33) in the return line (19), and a low-pressure regulator (23) being disposed in the leakage line (35).
Dependencies are inferred from the claim text.