Abstract
The control strategy of a hybrid electric vehicle (HEV) is generally not disclosed to public because it is a significant factor in determining the performance of the system. However, engineers desiring to understand the control concept of real-world HEVs can gain knowledge in various ways. In this study, we used test data obtained from a bench dynamometer and real driving to analyze the supervisory control strategy of Hyundai Ioniq Hybrid. This research can be described in three steps. First, an understanding of the mode control strategy is obtained by investigating the engine on/off behavior, which determines when the pure electric driving mode is used. Second, the shifting patterns are studied by observing the speed ratios according to the vehicle speed and the torque demand. Third, the strategy for distributing the torque between the engine and the motor is analyzed by studying the motor assistant operation. Based on the analyzed control concept, it is possible to understand the technical strategy for improving the fuel efficiency of the parallel hybrid system. This study would be useful for engineers who want to design controllers for HEVs, in that it provides the analyzed control concept and the real-world operating behaviors.
Highlights
IntroductionIn the past few decades, Original Equipment Manufacturers (OEMs) have made great efforts to attract customers to eco-friendly vehicles because of the regulations limiting total exhaust emissions
In the past few decades, Original Equipment Manufacturers (OEMs) have made great efforts to attract customers to eco-friendly vehicles because of the regulations limiting total exhaust emissions.The sales volume of eco-friendly vehicles is increasing every year, but is still smaller than that of conventional vehicles
Ioniq hybrid electric vehicle (HEV) depend on the vehicle speed, and the operating point of the engine can be optimized by its shifting map
Summary
In the past few decades, Original Equipment Manufacturers (OEMs) have made great efforts to attract customers to eco-friendly vehicles because of the regulations limiting total exhaust emissions. CT6 models [7,8,9,10] This system can choose the optimal mode observing power transmission efficiency with some clutches and planetary gears according to the vehicle speed [11]. The Sonata and Ioniq hybrid systems with P2 structure have a high fuel economy on the highway, and these systems are similar to powertrain systems as found in conventional vehicles. The power split system has a planetary gear that can be working like a Continuously Variable Transmission (CVT) and it can make the engine is operated on the Optimal Operating Line (OOL) This system can keep the State of Charge (SOC) well balanced with two motors.
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