Method for ascertaining an offset of an output signal of an evaluation circuit integrated in a sensor, preferably of a pressure sensor installed in a combustion chamber of an internal combustion engine, and sensor
AssigneeRobert Bosch GmbH
InventorHarald Ryll
Life of this patent
Estimating the term…
Abstract
In a method for ascertaining an offset of an output signal of an evaluation circuit integrated in a sensor, the output signal is supplied to a control unit which analyzes the output signal, and a reset of the evaluation circuit for the adjustment of the output signal to a base level is performed prior to each measuring operation of the sensor, and the control unit ascertains the offset of the output signal of the evaluation circuit upon an occurrence of a start signal output by the evaluation circuit.
Claims12
A method for ascertaining an offset of an output signal of an evaluation circuit integrated in a combustion chamber pressure sensor, the combustion chamber pressure sensor projecting into a combustion chamber of an internal combustion engine, comprising:
- prior to each measuring operation of the sensor, resetting the evaluation circuit for adjusting the output signal to a base level;
- forwarding the output signal of the evaluation circuit to a control unit which analyzes the output signal;
- ascertaining by the control unit an offset of the output signal of the evaluation circuit upon an occurrence of a start signal output by the evaluation circuit;
- and
- correcting the output signal of the evaluation circuit using the calculated offset.
A combustion chamber pressure sensor system projecting into a combustion chamber of an internal combustion engine, comprising:
- an evaluation circuit which transmits an output signal to a control unit which analyzes the output signal, wherein the evaluation circuit performs, prior to each measuring operation of the sensor, an internal reset for adjusting the output signal to a base level;
- and
- a start signal unit which outputs to the control unit a start signal for ascertaining an offset of the output signal of the evaluation circuit.
A control unit for ascertaining an offset of an output signal of an evaluation circuit integrated in a combustion chamber pressure sensor, the combustion chamber pressure sensor projecting into a combustion chamber of an internal combustion engine, comprising:
- a calculation unit including a processor configured to:
- ascertain an offset of the output signal of the evaluation circuit upon an occurrence of a start signal output by the evaluation circuit;
- and
- correct the output signal of the evaluation circuit using the calculated offset and supply the corrected output signal for a further evaluation.
Dependencies are inferred from the claim text.