Endurance test failure judgment method for automobile transmission system

Abstract

The invention provides an endurance test failure judgment method for an automobile transmission system. The endurance test failure judgment method includes the steps that i different working condition points t are set according to different rotating speeds n and different torques M, testing is carried out on a traditional system test piece at each working condition point t, the transmission efficiency at each working condition point t is obtained, then the i working condition points t are repeatedly tested, the transmission efficiency is calculated, an efficiency matrix is formed, and data filtering is carried out on the efficiency matrix; the mean values (please see the specification) and the variances sigma of the transmission efficiency of the working condition points t in the efficiency matrix are calculated, and a mean value change curve and a variance change curve are drawn; a mean value threshold value and a variance threshold value are set, when the mean values (please see the specification) are lower than the set mean value threshold value or the variances sigma are larger than the set variance threshold value, an alarm signal is emitted out, a device is notified to take stopping measures, and it is judged that the test piece fails. By means of the endurance test failure judgment method, interference can be effectively reduced, the foreboding generated before the transmission system fails can be effectively found, and early diagnosis can be achieved.

Description

technical field [0001] The invention relates to the field of automobile test control, in particular to a method for judging failure of an automobile transmission system durability test. Background technique [0002] The durability test of the automobile transmission system (drive axle, gearbox, transfer case) is very important, and there are a large number of related testing equipment, and the failure judgment of the test piece is especially critical. If damaged components are detected and replaced early, the test has the potential to continue running and thereby determine the durability of all test components. By preventing the destruction of each test object, the weak link of the test piece can be found early, which can save a lot of cost every year and improve the utilization rate of the equipment. Due to the difficulty of detection, this technology has been monopolized by foreign countries for a long time. The products of foreign manufacturers such as red-ant and reilh...

AI Technical Summary

Problems solved by technology

The regularity of mechanical vibration of test pieces with insufficient quality is poor, and the test equipment with average quality cannot completely isolate mechanical vibration interference and electrical interference, which also affects the monitoring of test piece vibration and other auxiliary data. The corresponding failure judgment not ideal

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