SCR blockage fault detection method, SCR blockage fault detection device and vehicle

Abstract

The invention discloses a SCR blockage fault detection method, an SCR blockage fault detection device and a vehicle, wherein the SCR blockage fault detection method includes the steps: A1, setting a second gas temperature T1 at the air inlet of the SCR A temperature sensor; A2. Set the second temperature sensor at the gas outlet of the SCR for measuring the gas temperature T2 at the gas outlet; A3. Calculate the difference T0 between the gas temperature T2 at the gas outlet and the gas temperature T1 at the inlet, when T0 is greater than Tf1 , to judge SCR blockage, where Tf1 is the temperature difference between SCR outlet and SCR inlet when blockage occurs. By setting the first temperature sensor and the second temperature sensor at the air inlet and outlet of the SCR respectively, and by comparing the difference T0 between the actual gas temperature at the gas outlet and the gas temperature at the gas inlet, when T0 is greater than Tf1, it is judged that the SCR is blocked, that is The SCR can be monitored to avoid the movement of the SCR in the state of severe blockage, which will lead to the sintering of the SCR, and effectively improve the operating safety of the vehicle.

Description

technical field [0001] The invention relates to the technical field of fault detection, in particular to a method for detecting an SCR blockage fault. The invention also relates to an SCR blockage fault detection device. Background technique [0002] In order to reduce environmental pollution, the Selective Catalytic Reduction Converter (Selective Catalytic Reduction, hereinafter referred to as SCR) for the treatment of NOx pollutants in diesel vehicle exhaust is widely used. , so that the reducing agent NH3 in the urea reacts with the NO and NO2 in the exhaust gas to reduce to N2. [0003] Since the body of the SCR has a structure with many fine and dense pores, once the SCR is blocked due to improper use or other reasons, it will cause problems such as engine power drop, flameout, difficulty in starting, or exhaust gas exceeding the standard, and even exhaust when serious blockage occurs Tube burning red and other phenomena, resulting in reduced vehicle operating safety....

AI Technical Summary

Problems solved by technology

[0003] Since the body of the SCR has a structure with many fine and dense pores, once the SCR is blocked due to improper use or other reasons, it will cause problems such as engine power drop, flameout, difficulty in starting, or exhaust gas exceeding the standard, and even exhaust when serious blockage occurs Tube burning red and other phenomena, resulting in reduced vehicle operating safety

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