This paper deals with the development of a test bench for mild hybrid drives used in construction machines. Due to the special conditions under which construction machines are operating this test bench needs to be adapted. Hence the bearing of the electrical drive, which is mounted directly to the internal combustion engine, the temperature control by a cooling circuit and the integration of an appropriate inverter as well as an electrical drive to complete the system are defining the specific requirements of the test bench. These circumstances also affect the measurements and have to be considered during the evaluation of the results.
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