Abstract
According to the structural characteristics of Hydro-mechanical continuously variable transmission (HMCVT), a multi-functional test bench was developed, and the basic structure, working principle, and test functions of the test bench were introduced. The test bench has the following characteristics: To analyze the impact of mechanical transmission and hydraulic transmission on the HMCVT transmission system, the performance can be tested separately by using a test bench; the coupling characteristics of the hydraulic transmission and mechanical transmission can also be tested; it can also test and verify the performance of the HMCVT transmission system and the control system; the test bench has a simple structure, diverse functions, and convenient operation. Using the multi-functional test bench, this paper proposes a method of multi-level test and verification. Through this method, the simulation models are revised and improved many times, and the accuracy of the models is improved, which are consistent with the physical model, and eventually, the accuracy of the simulation result is improved. This method is used to test and verify the hydraulic transmission system, analyze the characteristics of the hydraulic transmission system, and verify the feasibility and practicability of the multi-level verification method.
Highlights
With the impact of global environmental pollution pressure, energy conservation and emission reduction play an important role in improving people’s living environment
Hydro-mechanical continuously variable transmission (HMCVT) is a kind of power-split transmission, which mainly consists of a mechanical transmission, a hydrostatic continuously variable transmission (CVT), a power split device, and a power junction device [3,4]
Method of Multi-Level Test and Verification Given the structural characteristics of HMCVT, this paper proposes a multi-level test and verification method, which uses a multi-functional test bench to test and verify the components of HMCVT at the early stage of product development
Summary
With the impact of global environmental pollution pressure, energy conservation and emission reduction play an important role in improving people’s living environment. In the processes of the design and development of hydraulic-mechanical continuously variable transmissions, the performance test and verification are carried out on a special test bench after the prototype of the product. It is even assembled on the vehicle for verification. Through the two-level control mode of IPC and PLC, it can simulate the power characteristics of the engine to provide the power source for the test bench It can make the test conditions of the tested object the closest to the actual use conditions. Compared with the traditional test bench, this test bench can be used to and reliably perform the performance test of the hydraulic transmission unit of HMCVT, saving a lot of test time and cost
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