Propose the New Method for In-wheel Vehicle Experiment using Load Torque of Each Wheel -Including Performance Evaluation-

Abstract

In this study, propose the new method experiment and simulation for in-wheel vehicle that driver motor electronically controlled and operate independently using load torque of each wheel. Since in-wheel vehicle controlled each left and right driving wheels independently, it is dangerous if vehicles wheels are not a cooperative control. In general, when developing a new vehicle preceding power testing and performance evaluation in the dynamometer before the actual vehicle experiment. However, dynamometer tests only implements the linear test of driving. In case of in-wheel vehicle, since stable operation evaluation of the wheels motors that are independently controlled during turning is important. If applied to the load torque at the time of turning of the in-wheel vehicle to load motor of the dynamometer, it is capable of dynamic performance evaluation including turning on the dynamometer test. First, this study build main wheel control logic using PI control theory and evaluates the stability. Using Carsim & Matlab/Simulink, vehicle dynamic motion is simulated in virtual 3D driving road. . Through this, in-wheel vehicles driving performance can be analyzed. And using the analyzed dynamic performance, extract the load torque of each wheel while 3-D road driving. Extracted load torque impute to dynamometers load motor, linear experiment in dynamometer can replicated the 3-D road driving status. Also it, will be able to evaluate the more accurate performance analysis and stability, as a previous step of actual vehicle experiment. Each road will have a unique load torque for each wheel, propose the new simulator for in-wheel vehicle that powertrain performance and fuel economy evaluation using load torque of each wheel. In general simulator, cycle is input in simulator that the vehicle speed according to the time, it ignored the influence of the independence drive of the left and right wheels. If input the load torque and angular velocity derived from previous simulator, it is possible to obtain the same result as 3-D road driving, which is simulated in linear cycle. Developed simulator is composed of 29 motor library and 20 battery library. Using that library powertrain performance and fuel economy of the in-wheel vehicles with the desired motor and battery comes out as a result.