Method and device for extracting crystal road spectrum

Abstract

The embodiment of the invention discloses a crystallization road spectrum extraction method and device, and the method comprises the steps: screening the obtained actual operation data of an engine of a target vehicle model based on a preset crystallization working condition screening rule, and obtaining the crystallization working condition data; dividing the crystallization working condition data into a plurality of pieces of to-be-determined crystallization working condition data based on a preset standard working condition length; the preset indexes are used for representing the distribution characteristics of the counted data, so that the part closer to the crystallization working condition data can be screened out from the plurality of pieces of to-be-determined crystallization working condition data based on the difference between the preset indexes of the plurality of pieces of to-be-determined crystallization working condition data and the preset indexes of the plurality of pieces of to-be-determined crystallization working condition data; the road spectrum serves as a crystallization road spectrum used for identifying the actual crystallization working condition of the target vehicle type. Compared with a self-defined crystallization road spectrum, the obtained crystallization road spectrum can represent the actual crystallization working condition of the target vehicle model to a greater extent, so that the reliability of an engine performance bench test result of the target vehicle model is improved.

Description

technical field [0001] The present application relates to the field of computer technology, in particular to a method and device for extracting crystallographic profiles. Background technique [0002] SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) system is one of the treatment units widely used in engine exhaust emissions of motor vehicles. sexual NH 3 , and then under the action of the catalyst, the NO in the exhaust gas X reduced to N 2 and H 2 O. [0003] For motor vehicles with SCR systems, the problem of urea crystallization will have a great impact. For example, the deposit of urea crystallization will increase the exhaust back pressure of the engine, which will affect the operation of the engine. In severe cases, the exhaust pipe will be blocked road, causing the engine to fail to run. Urea crystallization refers to the crystallization of the injected urea on the inner wall of the exhaust pipe. For example, when the actual operating conditio...

AI Technical Summary

Problems solved by technology

In related technologies, R&D engineers define the crystallization roadmap by customizing the crystallization roadmap, which identifies the actual crystallization working conditions of the motor vehicle being tested, specifically, use the data of the self-defined crystallization roadmap as the input of the engine performance bench test parameters to guide the test process, but the self-defined crystallization roadmap often cannot represent the actual crystallization conditions well, and after the design that can reduce the urea crystallization problem verified by this is put into production, there are still large gaps in actual operation. Possibility of urea crystallization problems

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