关键词: 等效惯量；底盘测功机；驱动轮惯量；数学模型

Abstract: This article presents three testing methods for measuring the inertia of car drive wheels based on chassis dynamometer design. The article considers the rotational inertia of the drive wheels as equivalent to translational inertia and treats the inertia system formed by the chassis dynamometer and the drive wheels as a whole. These methods involve simulating inertia and loading resistance using the chassis dynamometer to test the inertia of the drive wheels. The first method is the force difference method, which is derived based on the principle of conservation of momentum. It utilizes the relationship between deceleration time under different loading forces to derive the total inertia of the system and, based on the known loading inertia of the chassis dynamometer, calculates the inertia of the drive wheels. The second method is the multiple mass fitting method, which derives the mechanical relationship during deceleration. It involves conducting deceleration time tests with different simulated inertias of the hub under the same loading resistance. A mathematical model is established to relate the simulated inertia of the hub, deceleration time, and inertia of the drive wheels. The intercept of the model represents the inertia of the drive wheels. The third method is the equivalent mass method, which solves the inertia of the drive wheels based on the mechanical balance equation during vehicle deceleration. These three testing methods enrich the drive wheel testing system and are suitable for testing the inertia of drive wheels in various scenarios. The research results based on the chassis dynamometer experiment indicate that the equivalent mass method has the advantage of higher accuracy in determining the inertia of the drive wheels. The development of these testing methods further enhances the accuracy of chassis dynamometer experiments.

Key words: Equivalent inertia; Chassis dynamometer; Inertia of the drive wheels; Mathematical model