Engine air cylinder sealing performance test method and system

Abstract

The invention relates to an engine air cylinder sealing performance test method and system. The method includes the following steps that: step A, an upper stopping point of an air cylinder to be tested of an electronic-controlled engine to be tested of an automobile to be tested is detected; step B, with the detected upper stopping point adopted as a critical point, time t1 during which a crankshaft rotates from an alpha-degree position before the detected upper stopping point to the detected upper stopping point and t2 during which the crankshaft rotates from the upper stopping point of the air cylinder to be tested of the electronic-controlled engine to be tested to a beta-degree position behind the upper stopping point of the air cylinder to be tested of the electronic-controlled engine to be tested are recorded; step C, angular velocity omega 1 and angular velocity omega 2 of the crankshaft at the time t1 and t2 are calculated respectively; and step D, the omega 1 is compared with preset benchmark angular velocity omega 01, and the omega 2 is compared with preset benchmark angular velocity omega 02, and whether air leakage occurs on the air cylinder to be tested of the electronic-controlled engine to be tested can be judged according to comparison results. The engine air cylinder sealing performance test method and system of the invention have the advantages of convenient testing and convenient use. With the engine air cylinder sealing performance test method and system adopted, disassembly of the engine on the automobile can be avoided, and rapid testing of the sealing performance of the air cylinder of the electronic controlled engine can be realized.

Description

technical field

[0001] The invention relates to the field of airtightness testing of engine cylinders, in particular to a method and system for testing the airtightness of engine cylinders, which are used to detect the airtightness of cylinders of electronically controlled engines on electronically controlled automobiles. Background technique

[0002] For electronically controlled vehicles, after a period of use, if the piston rings, injector gaskets are worn or the valve clearance becomes larger, the engine cylinders will not be well sealed or leak air, which will cause high fuel consumption and low output power. , work efficiency is low. Therefore, in actual use, it is necessary to periodically test the airtightness of the engine cylinder on the vehicle to monitor the airtightness of the electronically controlled engine on the vehicle.

[0003] In the prior art, mechanical methods are usually used for dismantling and inspection, and the components used are relatively comp...

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