CVT stepless speed changer slope starting performance test method

Abstract

The invention discloses a method for testing CVT (continuously variable transmission) slope-starting performance, comprising: step (a) tests on slope-starting capability respectively comprise: firstly testing starting performance respectively at D gear and R gear on flat road; then testing starting at slope with various gradients; testing forward starting performance and backward starting performance after halting the vehicle; test on slope practicality comprises: test for maximal halting gradient, idle vibration test for slope halting at D gear, test for impact and collision noise occurring during forward starting and backward starting at slope with various gradients; test on outdoor running; test to judge whether the speed ratio transformation works smoothly, whether the gear shifting position malfunction or disengagement occurs, whether the oil leakage occurs on air plug and whether the oil pump pressure reduces when normally running on outdoor long range slope; step (b) comparing recorded data with designed theoretical value of CVT in order to judge whether it meets the requirement. The invention has advantages of simple, rapid, compact, reasonable and convenient.

Description

technical field [0001] The invention relates to a method for measuring the performance of a CVT continuously variable transmission, in particular to a method for testing the performance of the CVT continuously variable transmission on slopes. Background technique [0002] Various types of automatic transmissions have been developed to meet the requirements for easy, convenient and comfortable driving of automobiles and to enhance the degree of automation of automobiles. CVT continuously variable transmission is one of them. Its English name is Continuously Variable Transmission. Different from other automatic transmissions that adopt hydraulic coupling transmission mode, CVT continuously variable transmission adopts the driving and driven wheels with variable working diameter. The transmission steel belt or belt is used as the transmission medium, and the output pressure of the hydraulic pump is controlled by the CVT continuously variable transmission control module TCU to a...

AI Technical Summary

Problems solved by technology

However, there is neither any standard to follow nor strict definition in the industry at present regarding whether the various performances of the CVT continuously variable transmissions developed and produced meet the design requirements, and how to verify them reliably; There is no reference or reference for the test of the performance test of the slope starting performance, which is one of the performance test indicators of the continuously variable transmission.

While the CVT is driving on a slope, the height of the hydraulic working oil level will change continuously with the slope. When the slope reaches a certain slope, the oil pump will no longer suck the working oil, which will cause the car to fail to drive normally, and sometimes even Oil leaks will occur, therefore, must be detected