Development of the Mode Conversion Control Logic of the Power Split Device of E-axle Equipped to Hydrogen Electric Vehicle

Due to the climate crisis and environmental concerns, regulations on greenhouse gas emissions from vehicles have been tightened. Commercial vehicles, which emit significant amounts of greenhouse gases, are increasingly in need of electrification. While most small electric vehicles operate only with a motor without a transmission, but medium-to-large vehicles require a transmission because they have a wide operating range and diverse driving conditions. Increasing motor size complicates optimal operation, making transmissions essential. Using manual transmissions in commercial vehicles can increase driver fatigue, and AMT transmissions lead to power interruptions during gear changes. To address this, the E-axle system, which combines dual motors with dog clutches, was introduced. This paper focuses on developing and testing a mode conversion control strategy and ASW for smooth gear changes in the E-axle system through vehicle tests.