Fundamental study of centrifugal pendulum vibration absorber with physical pendulum to suppress the torsional vibration in automatic transmission for cars

Abstract

In the latest trend in engine technology, high-power engines and low cylinder engines are widely used. These engines contribute to strong torsional vibration due to engine combustion within the powertrain systems. On the other hand, automatic transmission (AT) is required to use a lock-up clutch system which links engine and gear train directly from low engine rotation speed. Lock-up damper, torsional spring in torque converter, is not enough to absorb the torsional vibration. Therefore, the centrifugal pendulum vibration absorber (CPVA) is developed to suppress the torsional vibration. The natural frequency of CPVA is proportional to engine rotation speed. Then it is expected to suppress torsional vibration in wide range of the engine rotation speed. However, the natural frequency of the CPVA varies due to the nonlinear when the vibration amplitude of CPVA is large. There is a space limitation problem to install larger size of CPVA to suppress the strong torsional vibration. To overcome this problem, a new physical pendulum type of centrifugal pendulum vibration absorber is developed. In this study, the optimal design for the physical pendulum type of centrifugal pendulum vibration absorber is discussed.