A study of dealing with discrete value constraints in vibration control of automotive drive system

Abstract

This paper proposes a method to control the vibration of an automotive drive system by considering the engine torque discrete value constraint due to fuel cut. When engine torque suddenly changes, torsional vibration is generated inside the automotive drive system. This vibration interferes with driving performance and ride comfort. The previous study(1) showed that various model-based methods can be used to suppress this vibration. Currently, most automobiles are equipped with a fuel cut function for the purpose of fuel saving. In today's world, where fuel economy improvement is a priority, fuel cut has become an essential process for engines, and vibration control must take this into account. Since a certain amount of fuel is injected at once from the fuel injector when the engine returns from fuel cut, a discrete value constraint exists in vibration control that takes fuel cut into account. In this study, the optimal dynamic quantizer is introduced to the control system constructed by the model-based method to perform vibration control considering this constraint. As a basic study, simulations are conducted under the condition that the values of the engine torque are discrete values, and the performance of the optimal dynamic quantizer is discussed.