Exhaust pipe leakage detection method, system, engine controller and motor vehicle

Abstract

The invention relates to the technical field of vehicles, in particular to a detection method, system, engine controller and motor vehicle for air leakage of an exhaust pipe. The detection method of exhaust pipe air leakage according to the present invention includes: determining the current state of the engine according to the ambient temperature and the engine water temperature, the current state includes: a cold state and a warm state; if the engine is in a cold state, trigger parking Regeneration and timing, then obtain the first time when the engine is in the first stage of heating and the first temperature upstream of the oxidation catalytic converter, and judge whether the exhaust pipe is leaking; if the engine is in a warm state, trigger parking regeneration and timing, Obtain the second time when the engine is in the second stage of heating and the second temperature upstream of the oxidation catalytic converter to determine whether the exhaust pipe is leaking. By comparing the duration of the Lof phase, the duration of the Dry phase, and the time threshold in the cold state and warm state, it is possible to effectively identify whether there is air leakage in the exhaust pipe.

Description

technical field [0001] The present application relates to the technical field of vehicles, in particular to a detection method, system, engine controller and motor vehicle for air leakage of an exhaust pipe. Background technique [0002] In order to meet the requirements of the new emission regulations on the number of particulate matter (PN), Tejing V and China VI diesel engines need to install a particulate filter DPF device at the exhaust pipe. With the operation of the engine, the particles trapped in the particle filter will continue to accumulate, causing the exhaust back pressure of the engine to increase and fuel economy to deteriorate. In severe cases, the particle filter will be blocked. Regenerate the particle filter to restore its ability to trap particles. According to the previous experience in the Tejing V diesel engine market, an important reason for the unsuccessful regeneration is that the temperature cannot be effectively raised due to air leakage in the ...

AI Technical Summary

Problems solved by technology

According to the previous experience in the Tejing V diesel engine market, an important reason for the unsuccessful regeneration is that the temperature cannot be effectively raised due to air leakage in the exhaust pipe, the regeneration modes cannot be automatically switched, and the parking regeneration cannot be successfully completed automatically.

Moreover, since the market service personnel cannot effectively locate the cause of regeneration failure, it is very difficult to maintain and troubleshoot

At present, visual observation is generally used to monitor whether the exhaust pipe is leaking. However, the amount of air leakage varies under different operating conditions of the engine, and the visual evaluation results of different people will be different. It is impossible to intuitively and clearly judge whether the exhaust pipe really exists. Leakage phenomenon

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