Rationality fault diagnosis and processing system and method for oil temperature sensor

Abstract

The invention provides a rationality fault diagnosis and processing system and method for an oil temperature sensor. When the oil temperature electrical fault diagnosis does not report a fault, an oiltemperature rationality diagnosis module performs rationality diagnosis on an oil temperature signal acquired by the oil temperature sensor based on the oil temperature change characteristic; when the oil temperature electrical fault diagnosis reports a fault or the diagnosed oil temperature signal is irrational, an oil temperature replacement module replaces the irrational oil temperature signalwith a set oil temperature substitute value; and when the oil temperature signal is rational, an oil temperature filtering module filters the oil temperature signal acquired by the oil temperature sensor and the oil temperature signal before the rational fault or electrical fault of the oil temperature sensor is acknowledged, to replace the oil temperature signal before filtering with the filtered oil temperature signal. Based on the system, a rationality fault of the oil temperature signal can be determined, the diagnosis process is simple and effective, and the cost is reduced. Corresponding measures are taken for different diagnosis results to improve the shifting quality of a vehicle.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a rational fault diagnosis and processing system and method for an oil temperature sensor. Background technique [0002] At present, the diagnosis of gearbox oil temperature sensor is mostly limited to electrical diagnosis such as short circuit and disconnection, while the oil temperature sensor mostly uses a thermistor with a negative temperature coefficient. When the thermistor fails, the resistance value is abnormal, or the thermistor characteristic In the case of wrong curve matching, the electrical fault diagnosis method cannot be used for diagnosis. Therefore, if no electrical fault is reported, it is also necessary to diagnose the rationality of the oil temperature signal collected by the oil temperature sensor, so as to achieve accurate diagnosis of the fault of the oil temperature sensor. [0003] Generally, the method for the rationality diagnosis of the oil temper...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a rational fault diagnosis and processing system and method of an oil temperature sensor to solve the problem of cost and missing diagnosis of the oil temperature sensor using the rational fault diagnosis and processing method of the oil temperature sensor in the prior art. , Highly misdiagnosed problems

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