초록 ▼

A method for operating an internal combustion engine, in particular of a motor vehicle including at least one fuel pump delivers the fuel from a fuel tank into a fuel line. The pressure of the fuel, at least in a region of the fuel line, is increased as a function of an operating state. In order to

A method for operating an internal combustion engine, in particular of a motor vehicle including at least one fuel pump delivers the fuel from a fuel tank into a fuel line. The pressure of the fuel, at least in a region of the fuel line, is increased as a function of an operating state. In order to assure a reliable starting of the engine, the pressure of the fuel, at least In the above-mentioned region of the fuel line is at least intermittently increased when the engine is not running.

대표청구항 ▼

The invention claimed is: 1. In a method for operating an internal combustion engine (10), 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, 2

The invention claimed is: 1. In a method for operating an internal combustion engine (10), 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 at least intermittently increased when the engine (10) is not running compared to its pressure during normal operation, further comprising the step of connecting a high-pressure region (20, 24) and a low-pressure region (26, 34) of the fuel line (20, 24, 26, 34) to each other during the phase of increased pressure of the fuel, at least in the region (26) of the fuel line (20, 24, 26, 34). 2. The method according to claim 1 wherein the pressure of the fuel, at least in the above-mentioned region (26) of the fuel line (20, 24, 26, 34), is increased when the engine is not running if the temperature (T) of the engine (10) is above a limit value (TG). 3. The method according to claim 1 wherein the pressure of the fuel in the above-mentioned region (26) of the fuel line ( 20, 24, 26, 34) remains elevated at least during the starting (100) of the engine (10) and preferably during a period of time (102) after the starting (100) of the engine (10). 4. The method according to claim 2 wherein the pressure of the fuel in the above-mentioned region (26) of the fuel line ( 20, 24, 26, 34) remains elevated at least during the starting (100) of the engine (10) and preferably during a period of time (102) after the starting (100) of the engine (10). 5. The method according to claim 3 wherein after the starting of the engine, the time interval during which the pressure of the fuel remains elevated, at least in the above-mentioned region of the fuel line, depends on the temperature of the engine. 6. The method according to claim 1 comprising providing 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), and switching off the device (38) during the phase with increased fuel pressure. 7. The method according to claim 1 wherein 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). 8. The method according to claim 1 wherein 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). 9. A computer program, for executing the method according to claim 1, the computer program stored on a computer readable medium. 10. The computer program according to claim 9 characterized in that the program is stored in a flash memory. 11. A control and/or regulating unit (62) 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, the control and regulating unit being suitable for controlling and/or regulating the method according to claim 1. 12. The control and/or regulating unit (62) according to claim 11 wherein the control device (62) comprises a computer program stored in a flash memory. 13. An internal combustion engine (10) with at least one fuel pump (22, 32) that delivers fuel into a fuel line (20, 24, 26, 34) and with a device (32, 36, 38), which can increase the pressure of the fuel, at least in a region (26) of the fuel line (20, 24, 26, 34), as a function of an operating state of the engine ( 10), that it is provided with a control and/or regulating unit ( 62) according to claim 12. 14. The internal combustion engine according to claim 13 further comprising a first pressure adjusting device (38), which can adjust a normal pressure of the fuel, at least in a region (26) of the fuel line (20, 24, 26, 34), and a second pressure adjusting device (40), which can adjust an increased pressure of the fuel, at least in the above-mentioned region (26) of the fuel line (20, 24, 26, 34), wherein the first (38) and second pressure adjusting device ( 40) are each connected at least to the above-mentioned region ( 26) of the fuel line (20, 24, 26, 34), and wherein it also has a device (36), which when the engine ( 10) is not running, can fluidically disconnect the first pressure adjusting device (38) at least from the above-mentioned region ( 26) of the fuel line (20, 24, 26, 34). 15. The internal combustion engine according to claim 14, characterized in that the pressure adjusting devices (38, 40 ) and the disconnecting device (36) are integrated into a module.