Abstract
In this paper, control analysis was performed for a hybrid electric vehicle (HEV) equipped with a continuously variable transmission (CVT) under various driving conditions. First, a dynamic CVT model was developed by considering hydraulic and mechanical losses. The hydraulic loss accounts for the majority of the total losses at low vehicle speeds, whereas the mechanical loss accounts for the majority at high speeds. In addition, CVT ratio control and clamping force control strategies were developed, including manipulation of the CVT shift dynamics. On the basis of the dynamic model of the CVT, an HEV performance simulator was developed using Argonne National Laboratory (ANL)’s model-based simulation program, Autonomie. Second, by analysing the test results from ANL, an engine optimal operating line was constructed on the basis of the engine brake-specific fuel consumption. Third, the battery state-of-charge range and the battery characteristics of the maximum charging and discharging power were investigated. Using the analysis results, vehicle operation control strategies were developed for the acceleration, cruising, deceleration and idling modes. Also, control algorithms were developed for each vehicle operation mode. Finally, the control algorithms were verified by comparing the simulation results with the test results.
Highlights
In response to increasing regulation of fuel economy and exhaust emissions, various hybrid electric vehicle (HEV) configurations have been developed, such as the Toyota hybrid system, the Transmission Mounted Electric Device system of the Hyundai-Kia motor company, and the Integrated Motor Assist (IMA) system of Honda.Unlike the other HEV systems, the Honda IMA system uses a parallel hybrid configuration, in which the motor is directly connected to the engine [1]
The vehicle performance simulator and vehicle driving mode control strategy developed in this study were validated by comparing the simulation results with the experimental results
The vehicle performance simulator and driving mode control strategy developed in this study were validated by comparing the simulation results with the experimental results from Argonne National Laboratory (ANL)
Summary
In response to increasing regulation of fuel economy and exhaust emissions, various hybrid electric vehicle (HEV) configurations have been developed, such as the Toyota hybrid system, the Transmission Mounted Electric Device system of the Hyundai-Kia motor company, and the Integrated Motor Assist (IMA) system of Honda. To improve the HEV system efficiency, the efficiencies of the components, such as the engine and motor, have been studied [2] a cylinder idling system was investigated to decrease the friction resistance of the engine during regenerative braking [3]. These studies have been performed mainly at the component level. A vehicle performance simulator for the Honda IMA system was developed, and the driving mode control strategy was analyzed using the experimental results from dynamometer tests. The vehicle performance simulator and vehicle driving mode control strategy developed in this study were validated by comparing the simulation results with the experimental results
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