Method and device for operating a high-pressure accumulator fuel injection system for an internal combustion engine
First Claim
1. A method for operating a high-pressure accumulator fuel injection system for an internal combustion engine of a motor vehicle having an automatic stop/start function for deactivating and subsequently restarting the internal combustion engine independent of an intervention by the motor vehicle driver, in which fuel is fed to a high-pressure accumulator by a high-pressure pump, with at least one injector connected to the high-pressure accumulator for injecting fuel into at least one cylinder of the internal combustion engine, the method comprising:
- measuring a pressure of fuel in the high-pressure accumulator periodically during a stop phase of operation;
correlating the measured pressure value to an actuation current value of an electrically activated pressure control valve which is open in a currentless state using a pressure/current characteristic curve;
supplying a current to the pressure control valve at the actuation current value; and
as the stop phase continues, adjusting the supplied current based on a pressure drop in the high-pressure accumulator and the pressure/current characteristic curve.
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Accused Products
Abstract
A method is disclosed for operating a high-pressure accumulator fuel injection system for an internal combustion engine of a motor vehicle which has a stop-start automatic function by way of which the internal combustion engine can be switched off and restarted afterwards independent of the intervention of the driver of the motor vehicle, the fuel being conveyed to the high-pressure accumulator as needed by means of a high-pressure pump and the pressure of the fuel being adjusted on the pressure side by means of a pressure control valve which is electrically actuated and open when de-energized. According to the method, the supply with power of the pressure control valve is adapted to the prevailing pressure in the high-pressure accumulator during a stop phase within a stop-start cycle.
10 Citations
12 Claims
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1. A method for operating a high-pressure accumulator fuel injection system for an internal combustion engine of a motor vehicle having an automatic stop/start function for deactivating and subsequently restarting the internal combustion engine independent of an intervention by the motor vehicle driver, in which fuel is fed to a high-pressure accumulator by a high-pressure pump, with at least one injector connected to the high-pressure accumulator for injecting fuel into at least one cylinder of the internal combustion engine, the method comprising:
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measuring a pressure of fuel in the high-pressure accumulator periodically during a stop phase of operation; correlating the measured pressure value to an actuation current value of an electrically activated pressure control valve which is open in a currentless state using a pressure/current characteristic curve; supplying a current to the pressure control valve at the actuation current value; and as the stop phase continues, adjusting the supplied current based on a pressure drop in the high-pressure accumulator and the pressure/current characteristic curve. - View Dependent Claims (2, 3, 4)
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5. A device for operating a high-pressure accumulator fuel injection system for an internal combustion engine of a motor vehicle having an automatic stop/start function for deactivating and subsequently restarting the internal combustion engine independent of intervention by the motor vehicle driver, in which fuel is fed to a high-pressure accumulator by a high-pressure pump, with at least one injector connected to the high-pressure accumulator for injecting fuel into at least one cylinder of the internal combustion engine,
wherein the device is configured to: -
receive a measured value for a pressure of the fuel in the high-pressure accumulator periodically during a stop phase of operation; correlate the measured pressure value to an actuation current value of an electrically activated pressure control valve which is open in a currentless state using a pressure/current characteristic curve; supply current to the pressure control valve at the actuation current value, and as the stop phase continues, adjusting the supplied current based on a pressure drop in the high-pressure accumulator and the pressure/current characteristic curve. - View Dependent Claims (6, 7, 8)
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9. An internal combustion engine of a motor vehicle, comprising:
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at least one cylinder, a high-pressure accumulator fuel injection system having a high-pressure accumulator, a high-pressure pump configured to feed fuel to the high-pressure accumulator, and at least one injector connected for injecting fuel into the at least one cylinder, a control system for an automatic stop/start function for deactivating and subsequently restarting the internal combustion engine independent of intervention by the motor vehicle driver, and a pressure control device configured to; receive a measured value for a pressure of the fuel in the high-pressure accumulator periodically during a stop phase of operation; correlate the measured pressure value to an actuation current value of an electrically activated pressure control valve which is open in a currentless state using a pressure/current characteristic curve; supply current to the pressure control valve at the actuation current value, and as the stop phase continues, adjusting the supplied current based on a pressure drop in the high-pressure accumulator and the pressure/current characteristic curve. - View Dependent Claims (10, 11, 12)
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Specification