Starter durability test verification method and system

Abstract

The invention discloses a starter durability test verification method, which comprises the following steps: taking a plurality of samples from the same batch of starters as test samples; carrying outrefitting on a test engine to simulate increased parasitic load of an accessory mounted on the engine when the starter drives the engine to rotate; assembling each test sample with the corresponding test engine, and starting the starter to carry out loop test based on a preset method, wherein in the single cycle test, starting and stopping the starter for many times according to the time sequenceto simulate different starting conditions of the starter; and judging test result of each cycle test according to preset conditions, and generating a failure probability density function curve of a test sample group according to failure cycle number obtained after ending of the cycle test to indicate durability characteristics of the batch of starters of the test samples. The method can effectively improve starter test result reliability, improve starter durability test result accuracy, improve assessment mechanism and reduce test time.

Description

technical field [0001] The invention relates to the technical field of diesel engine engineering, in particular to a starter durability test verification method. The invention also relates to a starter durability test verification system. Background technique [0002] At present, domestic diesel engine starters mostly use DC series electric starters, and their durability test methods and evaluation standards basically refer to automotive industry standards (QC / T731-2005) and machinery industry standards (JB / T 6707-2006). At present, almost all starter manufacturers are verifying according to the above method. Although many products have passed the above test, according to the actual feedback from the market, there are the following problems: [0003] 1. Products of different specifications have passed the same verification test above (the test model and conditions are the same), but their reliability (far lower than the durability time) is very different, for example: A mod...

AI Technical Summary

Problems solved by technology

[0005] 3. The starter reliability verification takes a long time and is expensive

In order to increase the severity of the verification, usually 3 samples are taken for the verification test, and each sample will be subjected to 25,000 cycle tests, each cycle is 30 seconds, even if it is passed once, the final verification time will last for 2 to 4 months. Long-term occupation of 1 set of engine verification equipment

[0006] 4. In view of the fact that the aforementioned problems 1 and 2 have not been solved well, the starter manufacturer cannot effectively predict the design / manufacturing problems of the starter, and thus cannot predict the reliability status of the product after it is developed, which may lead to batch quality problems. be detected and resolved in a timely manner

[0007] Generally speaking, the durability test method of the starter in the prior art, because the test engine is directly used in the bare metal state for the starting test and does not consider the actual application characteristics, so the reliability prediction accuracy of the test results is not good, and at the same time , the specific test method is relatively simple, and the evaluation mechanism is relatively simple, which is not suitable for the actual application scene of the starter, which also leads to too optimistic test results, and the durability test results of the starter are inaccurately consistent with the actual application.

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