Method for checking a functionality of a rail pressure sensor
AssigneeRobert Bosch GmbH
InventorHenning Hermes
Life of this patent
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Abstract
A method for checking a rail pressure sensor, in which at least two values for the pressure of fuel in a fuel reservoir of an injection system are set on the basis of values for the pressure, which are ascertained by the rail pressure sensor; a desired quantity of fuel to be injected that is demanded by an idle-speed controller being ascertained for each set value of the pressure; and the desired quantities being compared to one another.
Claims10
A method for checking a rail pressure sensor of an internal combustion engine, comprising:
- setting at least two values for pressure of fuel in a fuel reservoir of an injection system based on values for the pressure which are ascertained by the rail pressure sensor;
- ascertaining, for a predetermined idling speed of the internal combustion engine, a desired quantity of fuel to be injected that is demanded by an idle-speed controller for each of the set values of the pressure, wherein the idle-speed controller controls idling operation of the internal combustion engine by controlling fuel injection into the internal combustion engine;
- and
- comparing the desired quantities to one another.
A method for checking a rail pressure sensor, comprising:
- setting at least two values for pressure of fuel in a fuel reservoir of an injection system based on values for the pressure which are ascertained by the rail pressure sensor;
- ascertaining a desired quantity of fuel to be injected that is demanded by an idle-speed controller for each of the set values of the pressure;
- and
- comparing the desired quantities to one another;
- wherein for each of the set values of the pressure, an actual control duration for providing the desired quantity of the fuel demanded is set and a setpoint control duration to be expected is ascertained by the idle-speed controller;
- and a difference between a value for the actual control duration and a value for the setpoint control duration is ascertained for each set value of the pressure, the ascertained differences between the values of the actual control duration and the values of the setpoint control duration being compared to one another for the different values of the pressure.
A method for checking a rail pressure sensor, comprising:
- setting at least two values for pressure of fuel in a fuel reservoir of an injection system based on values for the pressure which are ascertained by the rail pressure sensor;
- ascertaining a desired quantity of fuel to be injected that is demanded by an idle-speed controller for each of the set values of the pressure;
- and
- comparing the desired quantities to one another;
- wherein an actual control duration for providing the desired quantity of the fuel demanded is set and a setpoint control duration to be expected is ascertained by the idle-speed controller for each of the set values of the pressure;
- and a difference between the set actual control duration and a difference of the expected setpoint control duration are compared for at least two values of the set pressure.
A system for checking a rail pressure sensor of an internal combustion engine, comprising:
- a control unit configured to set at least two values for pressure of fuel in a fuel reservoir of an injection system based on values for the pressure that the rail pressure sensor ascertains, the control unit being further configured to cause an idle-speed controller to ascertain, for each set value of the pressure, a desired quantity of fuel to be injected that is demanded by the idle-speed controller for a predetermined idling speed of the internal combustion engine, wherein the idle-speed controller controls idling operation of the internal combustion engine by controlling fuel injection into the internal combustion engine, and the control unit being further configured to compare the desired quantities to one another.
Dependencies are inferred from the claim text.