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Dynamics of a Vehicle Equipped With Mechanical Self-Regulating Stepless Transmission


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DOI: https://doi.org/10.15866/ireme.v15i1.19912

Abstract


This article discusses the improvement of vehicle dynamic characteristics by the implementation of mechanical stepless transmission. The proposed transmission is an automatic, multi-flow gearbox whose operation is based on freewheeling mechanisms, a group of torsion shafts, and an eccentric conversion element (also known as an oscillation generator). The article represents the mathematical equations describing the angular velocities and the accelerations of the gearbox elements and the internal multi-stream power distribution, which allows for calculating the torque transformation by the transmission. As an example, a five-flows mechanical transmission is proposed with a detailed description of an eccentric conversion element kinematics. The developed Simscape model allows the calculation of the total gear ratio of the transmission depending on the engine torque and RPM, which is dependent on the load on the output shaft. As a bench test, a complete car model has been created in the Simulink software package. This model has allowed the determination of the dynamic characteristics of the selected vehicle and the analysis of the change in the total gear ratio of the transmission and the traction force on the driving axle. The simulation results show that the proposed mechanical automatic transmission has a higher total efficiency than the average mechanical gearbox and, at the same time, it has no power flow breaks with the ratio change during the vehicle acceleration.
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Keywords


Freewheel Clutch; Mechanical Stepless Transmission; Self-Regulating; Vehicle

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References


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