초록 ▼

Systems and methods for discriminating between an EGR temperature sensor fault and actual EGR temperatures which produce similar signals includes suppressing high voltage faults for a calibratible period of time after the engine is started. Alternatively, or in addition, a sensor fault is not indica

Systems and methods for discriminating between an EGR temperature sensor fault and actual EGR temperatures which produce similar signals includes suppressing high voltage faults for a calibratible period of time after the engine is started. Alternatively, or in addition, a sensor fault is not indicated unless secondary indicators suggest that EGR temperature is sufficiently different from the EGR temperature corresponding to the sensor signal. Secondary indicators may include signals provided by various other engine and/or vehicle sensors such as an ambient air temperature sensor, engine coolant temperature sensor, oil temperature sensor, or the like.

대표청구항 ▼

1. A system for discriminating between a sensor malfunction and engine conditions with similar or identical sensor signals in a compression ignition internal combustion engine, the system comprising:a first sensor for monitoring an engine condition; an engine control module in communication with the

1. A system for discriminating between a sensor malfunction and engine conditions with similar or identical sensor signals in a compression ignition internal combustion engine, the system comprising:a first sensor for monitoring an engine condition; an engine control module in communication with the first sensor, the engine control module monitoring signals generated by the first sensor to detect a potential malfunction of the first sensor, monitoring secondary engine condition indicators to infer an estimated range of values for the first sensor, generating a sensor malfunction code based on the potential malfunction if the sensor signals generated by the first sensor are inconsistent with the estimated range of values determined by the secondary engine condition indicators.