Test method for simulating real vehicle cold start emission test by using engine bench

Abstract

The invention discloses a test method for simulating real vehicle cold start emission test by using an engine pedestal, and belongs to the technical field of engines. According to the test method, the contribution of upgraded and optimized parts to emission can be quickly verified, and the test verification efficiency is greatly improved. The test method comprises the following steps that S1, the temperature of engine oil and the temperature of cooling liquid of an engine are reduced to the room temperature; S2, the engine is connected with emission direct extraction equipment and air-fuel ratio measurement equipment, and a cold start test is carried out; s3, after the engine is successfully started, the engine enters an idling working condition; and S4, after a period of time, the rotating speed and the torque are increased, the engine is preheated, data recording and analysis are conducted in the test process, and the emission performance of the current engine state can be judged through a test data curve. According to the test method, an efficient test method is provided for design, optimization and development of engine parts and CAE simulation verification, a new direction is provided for a national sixth engine bench emission development test, and the test method has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of engines, in particular to a test method for simulating the cold start emission test of a real vehicle using an engine bench. Background technique [0002] With the increasingly stringent emission regulations, in order to meet the National VI emission regulations issued by the country, the company's engines of various models have started to upgrade and reduce emissions. To meet the requirements of the National VI regulations on the basis of the original National V model, it is necessary to upgrade the engine valve mechanism, fuel supply system, EFI system and surrounding accessories. Moreover, relevant tests have shown that the emission under normal temperature and cold start conditions accounts for a large proportion of the entire set of China VI emission test conditions. Therefore, in order to verify the contribution of upgraded and optimized components to emissions, it is necessary to continuously carr...

AI Technical Summary

Problems solved by technology

Due to the complex structure of the whole vehicle, it is cumbersome to disassemble and replace parts, and some upgraded and replaced parts interfere with the whole vehicle to a certain extent, making it impossible to reinstall. If necessary, the whole vehicle needs to be restructured, and the vehicle needs to be soaked before the test, etc. operation, which seriously affects the verification efficiency, and the vehicle restructuring may even cause safety hazards

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