Test method for testing efficiency of whole vehicle generator through drum test bench

The invention discloses a test method for testing the efficiency of a whole-vehicle generator through a drum test bench, and belongs to the technical field of whole-vehicle test. A series of parameter measurements such as vehicle engine power measurement, vehicle wheel edge power measurement and generator output power measurement are carried out on the rotary drum, the generator efficiency is finally obtained, and all the measurements are based on the vehicle state. Comprising the following steps: S1, fixing a tested vehicle to a drum test bench; s2, connecting data acquisition equipment; s3, the rotating drum operation mode is set to be a constant-speed mode; s4, after the speed of the rotary drum is stable, the transmission of the tested vehicle is shifted into two gears, and the rotating speed of the engine reaches the target value of each working condition by adjusting the speed of the rotary drum; s5, setting N small working conditions according to the vehicle electric appliance switch under each large w