Back to results
US 8,739,616 B2Granted
Method for diagnosing a sensor unit of an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsHorst Wagner, Slobodanka Lux, Martin Hoerner
Life of this patent
Estimating the term…
Abstract
A method for diagnosing a sensor unit of an internal combustion engine, in which an output signal of the sensor unit is compared to a setpoint value which is specified independently from the output signal. The setpoint value relates to a periodic characteristic, and the variation over time of the value of the output signal of the sensor unit or a variable which is derived from the value variation over time is analyzed with regard to this periodic characteristic.
Claims17
A method for diagnosing a sensor unit of an internal combustion engine, the method comprising:
- comparing an output signal of the sensor unit to a setpoint value which is specified independently from the output signal, wherein the setpoint value possesses a periodic characteristic;
- and
- analyzing a variation over time of one of (i) a value of the output signal of the sensor unit, and (ii) a variable which is derived from a value variation of the value of the output signal over time with regard to the periodic characteristic;
- detecting a defect in a sensor unit when the analysis results in a measured value that is outside of a predetermined value range;
- wherein the periodic characteristic includes at least one of an amplitude and a phase characteristic, and wherein the comparing includes comparing at least one of the amplitude and the phase characteristic of one of the value variation over time and the variable which is derived from the value variation over time to at least one stored value for the setpoint value, wherein the defect in the sensor unit is assigned to an error pattern depending on the result of the comparison of at least one of the amplitude and the phase characteristic of one of the value variation over time and the variable which is derived from the value variation over time with the at least one stored value for the setpoint value.
2 more elements
A computer readable medium having a computer program, which is executable by a processor, comprising:
- a program code arrangement having program code for diagnosing a sensor unit of an internal combustion engine, by performing the following:
- comparing an output signal of the sensor unit to a setpoint value which is specified independently from the output signal, wherein the setpoint value possesses a periodic characteristic;
- and
- analyzing a variation over time of one of (i) a value of the output signal of the sensor unit, and (ii) a variable which is derived from a value variation of the value of the output signal over time with regard to the periodic characteristic;
- detecting a defect in a sensor unit when the analysis results in a measured value that is outside of a predetermined value range;
- wherein the periodic characteristic includes at least one of an amplitude and a phase characteristic, and wherein the comparing includes comparing at least one of the amplitude and the phase characteristic of one of the value variation over time and the variable which is derived from the value variation over time to at least one stored value for the setpoint value, wherein the defect in the sensor unit is assigned to an error pattern depending on the result of the comparison of at least one of the amplitude and the phase characteristic of one of the value variation over time and the variable which is derived from the value variation over time with the at least one stored value for the setpoint value.
3 more elements
A control unit for an internal combustion engine, comprising:
- wherein the control unit is configured for diagnosing a sensor unit of an internal combustion engine, by performing the following:
- comparing an output signal of the sensor unit to a setpoint value which is specified independently from the output signal, wherein the setpoint value possesses a periodic characteristic;
- and
- analyzing a variation over time of one of (i) a value of the output signal of the sensor unit, and (ii) a variable which is derived from a value variation of the value of the output signal over time with regard to the periodic characteristic;
- detecting a defect in a sensor unit when the analysis results in a measured value that is outside of a predetermined value range;
- wherein the periodic characteristic includes at least one of an amplitude and a phase characteristic, and wherein the comparing includes comparing at least one of the amplitude and the phase characteristic of one of the value variation over time and the variable which is derived from the value variation over time to at least one stored value for the setpoint value, wherein the defect in the sensor unit is assigned to an error pattern depending on the result of the comparison of at least one of the amplitude and the phase characteristic of one of the value variation over time and the variable which is derived from the value variation over time with the at least one stored value for the setpoint value.
3 more elements
Dependencies are inferred from the claim text.