Method for estimating endurance life of vehicle motor driving system

Abstract

The invention relates to a rack test method for accelerating service life and estimating the reliability of a vehicle motor driving system. By considering actual operation environments and work conditions of a vehicle motor system, a service life factor and a corresponding average service life can be calculated through specifically analyzing different failure mechanisms and influence factors of all key parts, so as to establish a service accelerating curve of al the key parts; and invalid data of all the key parts under a normal stress condition are obtained through extrapolating the curve. And then, a service life predicated value of the vehicle motor driving system is obtained according to the data, and determined replacing or maintaining time of the vehicle motor driving system is displayed to a user. By utilizing the rack test method to carry out rack service life examining test, the test time can be effectively reduced, the cost is reduced and the researching period is shortened; and the rack test method disclosed by the invention can help workers of electric vehicle manufacturers or vehicle 4S stores to conveniently know about the service life of the vehicle and the replacing or maintaining time of the vehicle.

Description

[0001] technical field [0002] The invention relates to the technical field related to the reliability of a vehicle motor drive system, in particular to an accelerated life test method for evaluating the reliability of a vehicle motor drive system. [0003] Background technique [0004] In the process of electric vehicle industrialization, its reliability has become the focus of attention of enterprises and customers. As the core component of electric vehicles, the reliability level of the motor drive system determines the reliability level of the whole vehicle to a large extent, and will directly affect the prospects of the industrialization of electric vehicles. With the development of science and technology and the deepening of people's safety awareness, users have higher and higher requirements for motor systems, and more and more attention has been paid to reliability. [0005] The electric vehicle motor drive system consists of a motor and its controller. Its task i...

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Problems solved by technology

[0010] A Chinese patent application with application number 201010129921.X discloses an accelerated life test method for automobile gearboxes, which discloses a method for performing accelerated life tests on automobile gearboxes at common speeds; Chinese patent application number 201010238799.X A method for evaluating the long life of components is disclosed in the patent application, which discloses a method for evaluating the long life of components by determining the best acceleration model of components through experimental methods; Chinese patent application with application number 201110170973.6 Disclosed is an accelerated life test method for electronic products, which discloses the technical content of evaluating the life of electronic products based on the "life-stress" acceleration model; a Chinese patent application with application number 201010187824.6 discloses a hybrid Engine reliability test system, which performs automatic simulation control through dspace software to perform reliability tests of hybrid engines; Chinese patent No. ZL200710094621.0 discloses a generator durability test bench, in which the Automatic control realizes the durability test of generator; the Chinese invention patent application that application number is 201010623747.4 discloses a kind of dynamic life test bench of hanging basket motor, wherein also realizes the dynamic life test of hanging basket motor by automatic control; Although the above-mentioned Invention patent application documents or patent documents more or less involve accelerated life tests, but they are all test methods or steps for a single mechanical component or electronic component; they do not involve combined tests involving mechanical components and electronic components ; As far as the applicant knows, for the accelerated life test of the vehicle motor system composed of mechanical components and electronic components, there are few researches at home and abroad, and there is no relatively complete accelerated life test method for the vehicle motor system

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