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AssigneeRobert Bosch GmbH
InventorsKlaus Joos, Jens Wolber, Thomas Frenz, Markus Amler, Hanjoerg Bochum
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A method is used for operating an internal combustion engine (10), in particular of a motor vehicle. In the method, at least one fuel pump (22, 32) delivers the fuel from a fuel tank (28) into a fuel line (20, 24, 26, 34). The pressure of the fuel, at least in a region (26) of the fuel line (20, 24, 26, 34), is increased as a function of an operating state. In order to assure a reliable starting of the engine (10), the pressure of the fuel, at least in the above-mentioned region (26) of the fuel line (20, 24, 26, 34), is at least intermittently increased (75) when the engine (10) is not running.
A method for operating an internal combustion engine (10), in particular of a motor vehicle, in which at least one fuel pump (22, 32) delivers the fuel from a fuel tank (28) into a fuel line (20, 24, 26, 34) and in which the pressure of the fuel, at least in a region (26) of the fuel line (20, 24, 26, 34), is increased as a function of an operating state, characterized in that the pressure of the fuel, at least in the above-mentioned region (24) of the fuel line (20, 24, 26, 34), is at least intermittently increased (75) when the engine (10) is not running.
The method according to one of the preceding claims, characterized in that a high-pressure region (20, 24) and a low-pressure region (26, 34) of the fuel line (20, 24, 26, 34) are connected to each other during the phase of increased pressure of the fuel, at least in a region (26) of the fuel line (20, 24, 26, 34), particularly when the engine (10) is not running.
The method according to one of the preceding claims, characterized in that a device (38), which sets the pressure of the fuel to a normal level, at least in the above-mentioned region (26) of the fuel line (20, 24, 26, 34), is switched off during the phase with increased fuel pressure.
The method according to one of the preceding claims, characterized in that the increase of the pressure of the fuel, at least in the above-mentioned region (26) of the fuel line (20, 24, 26, 34) when the engine (10) is not running, includes the activation of at least one fuel pump (32) after the engine (10) is switched off (70).
The method according to one of the preceding claims, characterized in that the increase of the pressure of the fuel, at least in the above-mentioned region (26) of the fuel line (20, 24, 26, 34) when the engine (10) is not running, also takes place at least by means of a temperature increase of the fuel in the above-mentioned region (26) of the fuel line (20, 24, 26, 34).
Dependencies are inferred from the claim text.