A hydraulic-mechanical composite transmission system test bench and its application

Abstract

A multifunctional test bench for a power split hydraulic mechanical composite transmission system, comprising a platform (19) and a control system. An alternating current servomotor (1), a flow splitting mechanism (2), a hydraulic transmission unit (3) to be tested, a flow combination mechanism (4), and a hydraulic loading system (5) are provided on the platform (19); the control system comprises an industrial control computer (33), a PLC (32), an input end PLC D / A module (31), an output end PLC D / A module (39), a signal acquisition unit (36), a pressure sensor (42), a flow sensor (41), a speed regulation controller (38), a loading system controller (40), and a servomotor controller (30). Performance test of a hydraulic mechanical composite transmission system can be simply and reliably carried out, test time and costs can be greatly reduced, and performance test of the hydraulic transmission unit (3) to be tested, the ratio test of mechanical and hydraulic power flows, and the stage switching stability test are implemented.

Description

technical field [0001] The invention relates to a multifunctional test bench for a power-split hydraulic-mechanical composite transmission system and its application, which is suitable for the dynamic performance test of the power-split hydraulic-mechanical composite transmission system and hydraulic transmission unit, and the mechanical and hydraulic power flow of the transmission system The proportion test and the stable performance test of section change belong to the technical field of engineering machinery and agricultural machinery. Background technique [0002] Construction machinery, tractors, etc. have large transmission power, wide range of speed changes, and complex operating conditions. With the development of social economy and technology, the requirements for power, fuel economy, ground adaptability, productivity, and operation automation level are getting higher and higher. , so the performance of the engine cannot be fully utilized. Energy saving and emissio...

AI Technical Summary

Problems solved by technology

At present, the design and development of hydraulic-mechanical continuously variable transmissions and performance tests are carried out on the prototype of the product, and then the test test is carried out on a special test bench or device, and through a series of test tests, the hydraulic transmission unit and mechanical of the prototype product are trial-produced. The transmission unit is often not the best design matching solution, and there may even be re-trial products, which leads to relatively high cost and long cycle of product design and development, and consumes a lot of manpower and material resources

Although the current development of computer simulation and virtual prototype technology has greatly shortened the product design cycle and cost, the inconsistency between the simulation conditions and the real working conditions will also lead to uncertainty in product development

[0004] The comprehensive performance of the hydromechanical compound transmission system is determined by the performance of the hydraulic and mechanical power flows and their joint action. The transmission efficiency characteristics of the mechanical transmission unit are relatively stable, but the transmission efficiency of the hydrostatic transmission unit is relatively low compared with the mechanical transmission. , the hydraulic pump, hydraulic motor, control valve group and connecting pipelines that make up the hydrostatic transmission unit have efficiency problems in the entire system unit, and the volumetric efficiency and mechanical efficiency of the pump and motor that affect the overall transmission efficiency of the unit vary with the speed. Constantly changing, the transmission efficiency is unstable

Images