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Hydraulic Hybrid Test Machine

Wednesday, July 06, 2011

This bench performance tests a hydraulic hybrid for commercial vehicle applications. The test part was pulled into the machine on a cart that we designed. The operator manually connects motoring and absorbing drive/motor combinations to the input and output shafts of the hybrid to simulate the vehicle. The bench supplied two fluids (hydraulic oil & ATF) which were temperature controlled and automatically filled and evacuated. In line particle counters were utilized to ensure that both fluid systems were operating within required cleanliness boundaries. The test involved full functional test of SAE J1939 communications between unit and vehicle plus calibration and verification of swash plate positioning in multiple pumps. The bench ran the part under test through it's gear ranges and performed shift quality evaluations. Ability to generate and store high pressures was verified as well. A complete test report was generated at the conclusion of each test including any trapped error codes. The entire machine was surrounded by a custom sound enclosure to limit noise on the production floor.

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