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AssigneeRobert Bosch GmbH
InventorsKlaus Joos, Jens Wolber, Thomas Frenz, Hansjoerg Bochum, Markus Amler
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The invention relates to a fuel delivery system for an internal combustion engine, having a fuel feed pump (10), which delivers fuel which is at pilot pressure to a high-pressure fuel pump (11) that communicates on the high-pressure side with at least one injection valve (14), in order to deliver fuel at high pressure to the injection valve or valves (14). To prevent vapor bubble development in the high-pressure fuel pump (11), which impairs its pumping capacity and pressure generation, it is provided according to the invention that a coolant medium flow can be delivered to the high-pressure fuel pump (11) via at least one coolant conduit (21, 31), in order to keep the temperature (THDP) of the high-pressure fuel pump (11) below a critical operating temperature (Tk1).
A fuel delivery system for an internal combustion engine, having a fuel feed pump (10), which delivers fuel which is at pilot pressure to a high-pressure fuel pump (11) that communicates on the high-pressure side with at least one injection valve (14), in order to deliver fuel at high pressure to the injection valve or valves (14), characterized in that a coolant medium flow can be delivered to the high-pressure fuel pump (11) via at least one coolant conduit (21, 31), in order to keep the temperature (THDP) of the high-pressure fuel pump (11) below a critical operating temperature (Tk1).
The fuel delivery system of one of the foregoing claims, characterized in that a pressure regulator device (19) is assigned to the high-pressure fuel pump (10), in order to enable adjusting the fuel pressure delivered to the high-pressure fuel pump (11) on the low-pressure side.
The fuel delivery system of one of the foregoing claims, characterized in that at least two coolant conduits (21, 31) are provided, of which one coolant conduit (21) delivers air and the other coolant conduit (31) delivers water as coolant medium to the high-pressure fuel pump (11).
Dependencies are inferred from the claim text.