Part and system test based reliability evaluation method for automobile automatic gearbox

Abstract

The invention discloses a part and system test based reliability evaluation method for an automobile automatic gearbox, and belongs to the technical field of automobile automatic gearbox research. The method comprises: performing part reliability evaluation according to test data of parts such as a hydraulic torque converter, an electro-hydraulic operation apparatus, a gear speed change mechanism, a gear shifting clutch and the like in the automobile automatic gearbox, and obtaining reliability prior information of a system according to a serial model; performing reliability evaluation according to system-level test data to obtain reliability field information of the system; and further, performing Bayesian data fusion on the prior information and the field information to realize part and system test based reliability comprehensive evaluation of the automobile automatic gearbox. According to the method, the reliability evaluation of the automobile automatic gearbox can be performed by utilizing test information of the parts and the system, and the characteristics of reliability problems of mechanical parts can be reflected, so that an evaluation result is relatively high in credibility and the information utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of automobile automatic transmission research, in particular to a method for evaluating the reliability of an automobile automatic transmission based on component and system tests. Background technique [0002] Automatic transmission is one of the important systems of automatic shifting vehicles. It is used to transmit power, shift gears and other functions. It is mainly composed of hydraulic torque converter, electro-hydraulic control device, gear transmission mechanism, shift clutch and so on. [0003] At present, when evaluating the reliability of automotive automatic transmissions in engineering development, the failure time data in the system-level product tests of automatic transmissions are mainly used. The specific scheme is as follows: [0004] (1) Collect reliability test data of automatic transmission system-level products, and perform data processing to obtain fault interval time data; [0005] ...

AI Technical Summary

Problems solved by technology

Only using the fault information in the system test, ignoring the fault information in the component test for reliability evaluation, cannot fully consider all the faults exposed in the entire development process of the automatic transmission, resulting in incomplete reliability evaluation and low information utilization;

[0010] (3) The failure interval time of electro-hydraulic components such as electro-hydraulic control device and hydraulic torque converter in the automatic gearbox obeys the exponential distribution, while the failure interval time of mechanical components such as gear transmission mechanism and shift clutch generally does not obey Exponential distribution, but subject to Weibull distribution; when only using the test data of automatic transmission system-level products for reliability evaluation, it is assumed that the failure interval time obeys the exponential distribution, which cannot reflect the reliability of mechanical components such as gear transmission mechanisms and shift clutches Characteristics of the problem

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