Process and device for controlling an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsJuergen Biester, Andreas Kellner
Life of this patent
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Abstract
A process and a device for controlling an internal combustion engine having high-pressure injection, in particular for an internal combustion engine having a common rail system. The fuel is delivered by at least one pump from a low-pressure area into a high-pressure area. A pressure sensor detects the fuel pressure prevailing in the high-pressure area. At least one first and one second final controlling element are provided for influencing the fuel pressure prevailing in the high-pressure area.
Claims19
A process for controlling an internal combustion engine having a high pressure injection, comprising the steps of:
- delivering fuel to a low-pressure area with a first pump;
- delivering the fuel from the low-pressure area to a high-pressure area with a second pump;
- regulating a fuel pressure of the fuel with a final controlling element and a pressure-regulating valve, the final controlling element being arranged in the low-pressure area and influencing a delivery quantity of the fuel in the low-pressure area, the pressure-regulating valve being arranged in the high-pressure area;
- applying a first drive signal to the final controlling element, the first drive signal being provided as a function of at least a fuel quantity to be injected;
- and
- applying a second drive signal to the pressure-regulating valve, the second drive signal being provided as a function of a comparison between an actual pressure value and a predetermined pressure value,
- wherein the final controlling element effects a closed loop control of the fuel pressure, and
- wherein the pressure-regulating valve effects an open loop control of the fuel pressure.
A device for controlling an internal combustion engine having a high-pressure injection, comprising:
- a first pump delivering fuel to a low-pressure area;
- a second pump delivering the fuel from the low-pressure area to a high-pressure area;
- a final controlling element being arranged in the low-pressure area and influencing a delivery quantity of the fuel in the low-pressure area;
- and
- a pressure-regulating valve situated in the high-pressure area and regulating a fuel pressure of the fuel
- wherein the final controlling element effects a closed loop control of the fuel pressure, and
- wherein the pressure-regulating valve effects an open loop control of the fuel pressure.
The process according to claim 12, wherein the final controlling element includes a high-pressure pump.
A process for controlling an internal combustion engine having a high pressure injection, comprising the steps of:
- delivering fuel to a low-pressure area with a first pump;
- delivering the fuel from the low-pressure area to a high-pressure area with a second pump;
- and
- regulating a fuel pressure of the fuel with a final controlling element and a pressure-regulating valve, the final controlling element being arranged in the low-pressure area and influencing a delivery quantity of the fuel in the low-pressure area, the pressure-regulating valve being situated in the high-pressure area,
- wherein the final controlling element effects a closed loop control of the fuel pressure, and
- wherein the pressure-regulating valve effects an open loop control of the fuel pressure.
Dependencies are inferred from the claim text.