Abstract
Torque converters are avital part of automatic transmission vehicles. In this paper the influence of a torque converter on the lowest mode of driveline vibrations (shuffle mode) is investigated. The automotive driveline is modelled by lumped parameter models, in which a steady-state torque converter model is inserted between the engine and the gearbox. A detailed mathematical model of a two-degree of freedom and a three-degree of freedom dynamic systemis given. The resulting nonlinear differential equations are linearized to obtain system transfer functions and to study damping characteristics of the torque converter.Additionally, a dynamic system model with nonlinear equations is developed in MATLAB/Simulink to verify the linearized system. The simulations show that the high frequency vibrations from the engine side are damped due to the torque converter and the linearized model predicts the system response accurately.
Highlights
Torque converters play an important role in the driving comfort, fuel economy and performance of automatic transmission vehicles
Barglazan [2] presented a theoretical model by considering the torque converter as a machine with lumped parameters
Inthe study by Walker [3] dual clutch transmission powertrain models with 4DOF and 15 degree of freedom (DOF) were compared to study the influence of engine torque harmonics on the transient response
Summary
Torque converters play an important role in the driving comfort, fuel economy and performance of automatic transmission vehicles. They have been investigated analytically, numerically and experimentally by many researchers in the last decades. Asl et al [5] presented the damping characteristics of a dynamic torque converter for the torque multiplication (forward flow), coupling and reverse flow modes by MapleSim. The results showed that the high frequency disturbances are effectively damped from the engine/pump side to the transmission/turbine side in all three operation modes. Some researchers did experimental work on this subject such as:Castiglione et al [7] investigated the transient torque converter behaviour and compared with the steady-state response measured in experiments. The transient fluid moment inside the torque converter has only been seen when the speed ratio near or above coupling point and torsional frequency was between 1 to 10 Hz
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