Application of Renesas RH850 for EV Automatic Manual Transmission Shifting Control

• Main Authors: Huang, Chun-Yu, 黃鈞昱
• Other Authors: Tseng, Chyuan-Yow
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/26818953543986597249

碩士 === 國立屏東科技大學 === 車輛工程系所 === 103 === This thesis is aimed to develop an automatic shifting control strategy for a micro electric vehicle (EV). The power package of the EV is composed of two 2 KW BLDC motors and three gear ratio clutch-less automatic manual transmission (AMT). With the combination of two motors and the multiple gears transmission, the vehicle is possessed with the characteristics of high torque and high rotation speed. The purpose of the use of two motor is to avoid torque hole during gear shifting processes. The Vehicle Control Unit (VCU) in this thesis is the Renesas RH850-F1L micro controller that fits the ISO26262 standard (the standards of vehicle safety). With the micro controller, an automatic shifting controller and gear shift strategy were designed. The works of this thesis can be divided into three parts, namely, function development of the micro controller, gear shift control algorithm design for the AMT, and finally automatic gear shift strategy for the AMT. The target was to achieve a top speed of 45 km/hr on level road, 8 km/hr for a slope of 27%. In order to complete automatic shifting function in a short time, this paper applied adaptive control theory for speed synchronization control. The design method of shifting strategy is based on the characteristics curve of the power motors and the gear ratio of the AMT. Furthermore, road loads and driver requests are considered to establish appropriate timing for up and down gear shifts. Experimental results have shown that, with the integration of the micro controller (RH850) and automatic shifting strategy, the EV could execute shifting process automatically and successfully and possessed with satisfactory driving performance and automatic shifting function for all driving conditions.