Method for determining a gas concentration in a measuring gas by means of a gas sensor
AssigneeRobert Bosch GmbH
InventorsMichael Walter, Joachim Palmer, Thiebaut Beyrath
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Abstract
The invention relates to a method for determining a gas concentration in a measuring gas by means of a gas sensor. In a first mode of operation of an internal combustion engine, in which the gas concentration in the measuring gas is known, a gas concentration signal and a pressure signal are detected. A compensation parameter of the gas sensor is determined from said signals. The thus determined compensation parameter is taken into account in at least one of the two modes of operation of the internal combustion engine for determining the gas concentration.
Claims5
A method of determining a gas concentration in a measuring gas with a gas sensor, the method executed by a control unit of a combustion engine, the method comprising:
- detecting a gas concentration parameter value with the gas sensor and an exhaust gas pressure parameter value in a first operation mode of the combustion engine in which the gas concentration in the measuring gas is known;
- determining a pressure dependent function of the gas concentration based on the detected gas concentration parameter value and the exhaust gas pressure parameter value;
- and
- calculating a compensation parameter based on the detected gas concentration parameter value and an average value of the exhaust gas pressure parameter value during the first operation mode of the combustion engine, the compensation parameter being a k-value determined based on the pressure dependent function;
- wherein the compensation parameter is taken into account afterwards in at least a second operation mode of the combustion engine for the determination of the gas concentration.
A device configured to determine a compensation parameter of a gas sensor, comprising:
- a compensation module configured to determine a compensated gas concentration and an exhaust gas pressure;
- an overrun detection configured to determine an overrun condition operation of the combustion engine;
- an adaption module configured to adapt a compensated gas concentration;
- and
- a compensation parameter adaption module;
- wherein the compensation parameter adaption module, in the presence of an overrun condition operation of the combustion engine based on the detected gas concentration parameter value and an average value of the exhaust gas pressure during the overrun condition operation, calculates a compensation parameter of the gas sensor, wherein a pressure dependent function of gas concentration is determined based on the detected gas concentration parameter value and the exhaust gas pressure, the compensation parameter being a k-value determined based on the pressure dependent function.
Dependencies are inferred from the claim text.