Urea nozzle fault detection method and device, storage medium and vehicle

Abstract

The present disclosure relates to a urea nozzle fault detection method, apparatus, storage medium, and vehicle, by providing a urea nozzle fault detection method applied to a urea supply system in a vehicle, the urea supply system including a urea supply pump that injects urea at a target pressure through a urea nozzle, the rotating speed of the urea supply pump is in negative correlation with the pressure at the urea nozzle, and rotating speed information of the urea supply pump in a preset time period is obtained; determining a fault detection parameter according to the rotating speed information; and determining the fault state of the urea nozzle according to the fault detection parameters. Therefore, the fault state of the urea nozzle can be timely and effectively detected, so that faults can be timely eliminated, urea waste caused by frequent spraying of urea is avoided, and the problem that emission of NOx in vehicle tail gas exceeds the standard due to the fact that urea is not sprayed or the spraying amount of urea is small is avoided.

Description

technical field [0001] The present disclosure relates to the technical field of vehicles, and in particular, to a method, device, storage medium and vehicle for detecting failure of a urea nozzle. Background technique [0002] With the continuous tightening of national regulations on vehicle exhaust emission requirements, in order to reduce the NO in vehicle exhaust x SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) system is usually installed on the vehicle, and by accurately and quantitatively injecting high-pressure urea solution into the exhaust pipe, and the NO in the exhaust gas x react to form N 2 and H 2 O. The accuracy of the injection amount of urea solution affects the NO in vehicle exhaust. x Emissions are a very important factor. However, in the actual operation process, due to the influence of urea crystals, the valve stem of the urea nozzle is often stuck by the crystals during use, so it cannot move, resulting in the phenomenon that ure...

AI Technical Summary

Problems solved by technology

However, in the actual operation process, due to the influence of urea crystallization, the valve stem of the urea nozzle is often stuck by the crystal during use, so that it cannot move, resulting in the phenomenon that urea is often sprayed or the nozzle does not spray urea, and no urea is sprayed. Or if the amount of urea injection is too small, it will cause NO in the vehicle exhaust x The discharge exceeds the standard, causing environmental pollution, and frequent spraying of urea will cause waste of urea

[0003] The current fault detection method for the urea nozzle cannot detect the fault of the urea nozzle in a timely and accurate manner, which is not conducive to timely processing of the fault, so that it is impossible to avoid NO in the vehicle exhaust. x Excessive emissions and high urea consumption

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