Abstract
A novel dual-belt Van Doorne’s continuous variable transmission (DBVCVT) system, which is applicable to heavy-duty vehicles, has been previously proposed by the authors in order to improve the low torque capacity of traditional single-belt CVT. This DBVCVT is a novel design among continuously variable transmissions and is necessary to be prototyped for experimental study, and the analytical dynamic model for this DBVCVT also needs to be experimentally validated. So, this work originally fabricated a prototype of DBVCVT and integrates this prototype to a light-load hardware-in-the-loop test rig by replacing the engine and load equipment with the AC motor and magnetic powder dynamometer. Moreover, with the use of this newly developed test rig, this work implements the experimental study of this DBVCVT for the first time. The comparison of experimental and simulation results validates the previously proposed analytical model for DBVCVT, and some basic characteristics of the DBVCVT in terms of the reliability, speed ratio, and transmission efficiency are also experimentally studied. In all, this developed test rig with the analytical model lays the foundation for further study on this novel DBVCVT.
Highlights
Continuous variable transmission (CVT) is a type of automatic transmission which is increasingly used in automotive applications
They have a good agreement under different test conditions, respectively, which means that the analytical model can effectively predict the dynamic characteristics and correctly describe the transmission performance of the proposed DBVCVT at different transmission conditions
The feasibility of the test rig and the correctness of the analytical model can be coupled to lay the foundation for controlling the DBVCVT in order to achieve the accurate speed ratio, low slip, and high transmission efficiency
Summary
Continuous variable transmission (CVT) is a type of automatic transmission which is increasingly used in automotive applications. Oh et al used a real-time simulation platform to establish a transmission model of the CVT and conducted the TCU hardware-in-the-loop test, including speed ratio changing model, torque converter lockup control model, and system pressure control model [39]. This work for the first time develops a hardware-in-the-loop test rig with the fabrication of a new prototype of DBVCVT, providing a test platform for further study on the transmission performance and the control system of the DBVCVT In this development, to overcome disadvantages of conventional test rig of the CVT such as complex structure, high cost, and large power consumption, this work replaces the engine and load equipment with the AC motor and magnetic powder dynamometer in the test rig of the DBVCVT for a simpler structure and lower cost and power consumption. Further experimental study is compared with the analytical model to collectively analyze the transmission performance of the DBVCVT and provide a foundation for further modelling, simulation, and control
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