Method for determining a controlled variable for pressure control of a high-pressure accumulator in an injection system
AssigneeContinental Automotive GmbH
InventorsFredrik Borchsenius, Michael Wirkowski
Life of this patent
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Abstract
In a method for determining a controlled variable of pressure control of a high-pressure accumulator of an injection system, a setpoint pressure gradient value is determined in the high-pressure accumulator as a function of the maximum possible actual pressure gradient value.
Claims9
A method for determining a controlled variable for pressure control of a high-pressure accumulator in an injection system comprising a pump for supplying a quantity of fuel into the high-pressure accumulator and a measuring unit for determining a pressure value in the high-pressure accumulator,
- the method comprising the steps of:
- determining a target pressure gradient value from a stored engine characteristics map as a function of the determined pressure value in the high pressure accumulator and a differential pressure between the fuel quantity which leaves the injector as a result of at least one of a switch leakage and injections in the internal combustion engine, and the fuel quantity which is delivered to the high-pressure accumulator by means of the pump.
A method for determining a controlled variable for pressure control in a high-pressure accumulator in an injection system comprising a pump for supplying a fuel quantity into the high pressure accumulator and a measuring unit for determining a pressure value in the high-pressure accumulator,
- the method comprising the steps of:
- determining a target pressure gradient value by multiplying a factor with a differential value between the fuel quantity, which leaves the injector as a result of at least one of switch leakages and injections into the internal combustion engine and the fuel quantity, which is supplied to the high-pressure accumulator through the pump.
A system for determining a controlled variable for pressure control of a high-pressure accumulator in an injection system, comprising a pump for supplying a quantity of fuel into the high-pressure accumulator and a measuring unit for determining a pressure value in the high-pressure accumulator, the system being operable to determine a target pressure gradient value from a stored engine characteristics map as a function of the determined pressure value in the high pressure accumulator and a differential pressure between the fuel quantity which leaves the injector as a result of at least one of a switch leakage and injections in the internal combustion engine, and the fuel quantity which is delivered to the high-pressure accumulator by means of the pump.
Dependencies are inferred from the claim text.