Abstract:

The selection principle of flywheels in the inertial system of the automobile chassis dynamometer was analyzed to enhance its test accuracy. The gradation principle of flywheels was proposed based on the double multiplication method, and an inertial system with 9 steps of flywheel groups was designed, the simulative mass ranging 500~10 000 kg was divided into 512 levels with accuracy of ±10 kg. The accurate matching between the simulative flywheel mass and the tested automobile mass was realized. The optimal design of the flywheel was performed. The braking method of the flywheel was studied to remove the additional inertia moment from the inoperative flywheel in the test process, ensuring the accuracy of test results. An experimental prototype of the inertial system was developed. The feasibility and accuracy of the developed precise and fractionized inertial system were validated by comparative tests.

Key words: vehicle engineering, vehicle detection, chassis dynamometer, inertial system, precise and fractionized method