Fuel supply system of an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsHelmut Rembold, Kurt Frank
Life of this patent
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Abstract
In fuel supply systems with two fuel pumps connected in series and fuel valves that inject directly into the combustion chamber, there have been occasional problems. The proposal is made that in order to eliminate these problems, the first fuel pump operates with increased delivery capacity, particularly during the startup process and in the event of high fuel temperature. The fuel supply system is provided for an internal combustion engine of a vehicle.
Claims25
A fuel supply system for delivering fuel for an internal combustion engine, comprising a fuel tank, a first fuel pump (6) for pumping a variable pumping capacity, a mechanically driven second fuel pump (12), and at least one fuel injection valve (16), wherein the first fuel pump (6) delivers the fuel from the fuel tank into a fuel line connection (10) and the second fuel pump (12) delivers the fuel from the fuel line connection (10) by way of a fuel pressure line (14) to the fuel valve (16), via which the fuel travels at least indirectly into a combustion chamber of the engine, the first fuel pump (6) delivers the fuel into the fuel line connection (10) with a delivery capacity that is changed as a function of an operating condition of the engine, in which two pressure control valves (26, 28), which are hydraulically and functionally parallel and are set to different pressure values, are provided for monitoring a delivery pressure prevailing in the fuel line connection (10).
A fuel supply system for delivering fuel for an internal combustion engine, comprising a fuel tank, a first fuel pump (6) for pumping a variable pumping capacity, a mechanically driven second fuel pump (12), and at least one fuel injection valve (16), wherein the first fuel pump (6) delivers the fuel from the fuel tank into a fuel line connection (10) and the second fuel pump (12) delivers the fuel from the fuel line connection (10) by way of a fuel pressure line (14) to the fuel valve (16), via which the fuel travels at least indirectly into a combustion chamber of the engine, the first fuel pump (6) delivers the fuel into the fuel line connection (10) with a delivery capacity that is changed as a function of an operating condition of the engine, in which a valve device (30, 30c, 30d) is provided, which influences a delivery pressure in the fuel line connection (10) in an operationally dependent manner, and further, in which the valve device (30, 30c, 30d) is provided in a fuel line (22) leading from the fuel line connection (10) into the fuel tank (2) and is disposed hydraulically and functionally in series with a pressure control valve (26).
Dependencies are inferred from the claim text.