Failure control method for temperature sensor of automobile particulate filter

Abstract

The invention discloses a failure control method for a temperature sensor of an automobile particulate filter. The failure control method comprises the following steps of entering a failure control mode when detecting that the temperature sensor of the particulate filter breaks down, immediately prompting a failure and stopping active regeneration control of the particulate filter firstly; if thefailure is not repaired and the continuous mileage of an automobile is larger than the set mileage, reducing the carbon accumulation amount of the particulate filter by controlling engine operation parameters; and if the failure is repaired and the driving time is greater than the set reset time, resetting the carbon accumulation amount of the particulate filter to 0, and entering a normal controlmode. By means of the method, when the temperature sensor of the particulate filter breaks down, the risks that a driver is misled and the particulate filter is burnt out can be avoided, meanwhile, blockage caused by the too high carbon accumulation amount is avoided, and the safety of the whole automobile is improved.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a method for controlling the failure of a temperature sensor of an automobile particle trap. Background technique [0002] In the National VI emission standards, the emission limits of automobile exhaust pollutants have been further strengthened. In order to meet the requirements of particulate matter in automobile exhaust, the technical route of most OEMs is to install particulate filters in the exhaust system. The collector can capture more than 90% of the particles in the car exhaust. However, the captured particles will adhere to the filter body of the filter. As the particles continue to accumulate, the exhaust resistance of the engine will continue to increase. When the particle filter is severely blocked, the back pressure of the engine exhaust system will increase. The engine power and economy will also deteriorate. [0003] A particle filter temperature sens...

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Problems solved by technology

However, the patent does not mention that if the temperature sensor of the particle filter fails, it may cause an error in the estimation of the carbon accumulation, which may lead to a wrong reminder to the driver that the carbon accumulation is too high, causing the driver to panic and the particle filter Burned out; it may also cause the accumulated carbon to be too high without timely reminding the driver, resulting in the serious clogging of the particle filter and the increase of the back pressure of the engine exhaust system, resulting in deterioration of engine power and economy

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