Fuel injector needle valve and needle valve body frictional wear performance test system and test method

Abstract

The invention discloses a fuel injector needle valve and needle valve body frictional wear performance test system and test method. A needle valve sample and a needle valve body sample are oppositelyfixed through corresponding fixing devices correspondingly, lubricating oil is added to the surface of the needle valve body sample, after test parameters are set according to test working conditions,loads are applied to the needle valve sample and the needle valve body through an axial force loading device, the needle valve sample and the needle valve body are heated through a heating device, apermanent magnet is driven by an electromagnetic driving device to drive the needle valve sample and the needle valve body sample to do high-frequency reciprocating rectilinear motion, corresponding test parameter changes are monitored in real time through a main engine, and when the friction coefficient reaches an early warning value, a control system performs shutdown protection. According to the test system and the test method, the test time can be greatly shortened, additional engine oil or fuel oil does not need to be added in the test process, and the test cost is effectively saved.

Description

technical field [0001] The invention belongs to the technical field of performance testing of fuel injectors of automobile gasoline engines, and in particular relates to a testing system and a testing method for the friction and wear performance of a needle valve and a needle valve body of a fuel injector Background technique [0002] The fuel injector is the most important assembly in the gasoline engine fuel injection system. At present, the requirements for fuel economy and engine thermal efficiency are gradually increasing, and the performance indicators such as injection pressure and atomization capacity of the injector are correspondingly improved. In the fuel injector assembly, the needle valve cooperates with the needle valve body to inject fuel into the combustion chamber. During the fuel injection process, the needle valve and the needle valve body are in a high temperature and high oil pressure environment, which is prone to friction and wear. Therefore, the fri...

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Problems solved by technology

Therefore, the friction and wear performance of the pair of needle valve and needle valve body directly affects the injection pressure of the injector and the effect of fuel atomization, which in turn affects the fuel economy and thermal efficiency of the whole machine.

[0003] At present, the only way to test the friction and wear performance of the needle valve and the needle valve body under different materials, heat treatment process, and surface treatment process is to install the matching pair on the fuel injector and follow the whole machine to conduct a reliability verification test. The test time is generally Not less than 550 hours, the test period is longer; in addition, because the test is a "thermal engine test", it needs to consume a lot of fuel, and the test cost is high

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