Diesel oxidation catalyst (DOC) temperature sensor rationality diagnostic
AssigneeGM Global Technology Operations LLC
InventorsChuan He, Richard B. Jess, Jay Tolsma, GuoJun Shi, Jose L. DeLeon, Kouji Sakumoto
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Abstract
A temperature sensor rationality control system for an exhaust treatment system having an oxidation catalyst includes an oxidation catalyst inlet temperature sensor that generates an inlet temperature signal and an oxidation catalyst outlet temperature sensor that generates an outlet temperature signal. A control module determines whether a difference based on the inlet temperature signal and the outlet temperature signal is below a difference threshold when an exhaust temperature is within a threshold range.
Claims21
A temperature sensor control system for an exhaust treatment system of a vehicle having an oxidation catalyst, comprising:
- an oxidation catalyst inlet temperature sensor that generates an inlet temperature signal;
- an oxidation catalyst outlet temperature sensor that generates an outlet temperature signal;
- and
- a control module that determines a delayed inlet temperature value based on at least one of a calibration factor, a previous delayed inlet temperature value and said inlet temperature signal and determines whether a difference based on said delayed inlet temperature signal and said outlet temperature signal is below a difference threshold when an exhaust temperature is greater than a first threshold temperature and is less than a second threshold temperature.
A method of determining a status of a temperature sensor of an exhaust treatment system of a vehicle having an oxidation catalyst, comprising:
- generating an inlet temperature signal at an oxidation catalyst inlet using an inlet temperature sensor;
- generating an outlet temperature signal at an oxidation catalyst outlet using an outlet temperature sensor;
- generating a delayed inlet temperature value based on at least one of a calibration factor, a previous delayed inlet temperature value and said inlet temperature signal;
- calculating a difference based on said delayed inlet temperature signal and said outlet temperature signal;
- and
- determining a status of said inlet and outlet temperature sensors based on said difference when an exhaust temperature is greater than a first threshold temperature and is less than a second threshold temperature.
A method of diagnosing an operating condition of a temperature sensor of an exhaust treatment system of a vehicle having an oxidation catalyst, comprising:
- generating an inlet temperature signal at an oxidation catalyst inlet using an inlet temperature sensor;
- generating an outlet temperature signal at an oxidation catalyst outlet using an outlet temperature sensor;
- determining a delayed inlet temperature signal based on said inlet temperature signal and characteristics of said oxidization catalyst;
- calculating a difference based on said delayed inlet temperature signal and said outlet temperature signal;
- and
- determining a status of said inlet and outlet temperature sensors based on said difference when an exhaust temperature is greater than a first threshold temperature and is less than a second threshold temperature.
Dependencies are inferred from the claim text.