Operating method for operating a fuel injection system and fuel injection system
AssigneeContinental Automotive GmbH
InventorsOliver Seegmüller, Tobias Ritsch
Life of this patent
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Abstract
Embodiments relate to an operating method for operating a fuel injection system of an internal combustion engine, wherein, upon a detection of a fault in the fuel injection system, and wherein a predefined pressure is overshot in a high-pressure region of the fuel injection system, an overrun mode of the internal combustion engine is deactivated, such that the internal combustion engine is operated exclusively in an injection mode.
Claims19
An operating method for operating a fuel injection system of an internal combustion engine, the method comprising:
- providing a fuel injection system, having a high-pressure fuel pump with a pump piston which is movable in translational fashion in a pressure chamber during operation and which serves for highly pressurizing a fuel, having a high-pressure region for storing the highly pressurized fuel, and having at least one injector valve which is connected to the high-pressure region and which serves for injecting highly pressurized fuel into a combustion chamber of the internal combustion engine;
- providing at least two operating states of the internal combustion engine, wherein, in an overrun mode, no injection of fuel through the at least one injector valve into the combustion chamber takes place, wherein, in an injection mode, at least one injection of fuel through the at least one injector valve into the combustion chamber takes place;
- providing a pressure-limiting valve which, when a predefined opening pressure is reached in the high-pressure region, discharges fuel from the high-pressure region into the pressure chamber of the high-pressure fuel pump;
- detecting a fault situation in the fuel injection system, wherein the predefined opening pressure is overshot in the high-pressure region;
- and
- deactivating the overrun mode of the internal combustion engine in the fault situation, such that the internal combustion engine is operated exclusively in the injection mode.
A fuel injection system for injecting fuel into combustion chambers of an internal combustion engine, the fuel injection system comprising:
- a high-pressure fuel pump with a pump piston which moves in translational fashion in a pressure chamber during operation and which serves for highly pressurizing a fuel;
- a high-pressure region for storing the highly pressurized fuel;
- at least one injector valve which is connected to the high-pressure region and which serves for injecting highly pressurized fuel into a combustion chamber of the internal combustion engine;
- a pressure-limiting valve which, when a predefined opening pressure is reached in the high-pressure region, discharges fuel from the high-pressure region into the pressure chamber of the high-pressure fuel pump;
- and
- a control device which is configured to
- provide at least two operating state of the internal combustion engine, wherein, in an overrun mode, no injection of fuel through the at least one injector valve into the combustion chamber takes place, wherein, in an injection mode, at least one injection of fuel through the at least one injector valve into the combustion chamber takes place;
- detect a fault situation in the fuel injection system, wherein pressure in the high-pressure region exceeds the predefined opening pressure;
- and
- deactivate the overrun mode of the internal combustion engine in the fault situation, such that the internal combustion engine is operated exclusively in the injection mode.
Dependencies are inferred from the claim text.