Abstract
Drivetrain bench system is utilized to test powertrain components of a vehicle such as transmission, torque converter, etc. Conventional drivetrain bench system emulates the moment of inertia of a vehicle body. In order to simulate real road loads of the powertrain components, it is necessary that the dynamometer of the drivetrain bench emulates the moment of inertia of a tire. The moment of inertia of the tire is lower than the moment of inertia of the dynamometer. So, the dynamometer needs low inertia emulation control. The drivetrain bench is mechanical vibration system. The principal factor of the vibraion is stiffness of a drive shaft. In this paper, we propose a low inertia emulation control method for vibration system and its application to simulating real road loads. Basic idea of the proposed low inertia emulation control method is feedforward of torque that is necessary for accelerating emulated inertia. By numerical simulations, it is shown that real road loads tests can be implemented with the proposed control method.
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