Hybrid Vehicle Shifting Control Method for Smooth Mode Switching
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Solution Overview
Problem
Current shifting control methods for hybrid vehicles with automatic mechanical transmission lack mode switching capabilities, limiting driving requirements and resulting in poor fuel economy and low comfort due to a single controlling mode.
Innovation Solution
A shifting control method for hybrid vehicles that detects operating parameters to determine work modes, including electric-vehicle and hybrid-electric-vehicle modes, and performs speed adjustments and shifting controls to optimize power transmission, enabling smooth and comfortable operation across various conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single controlling mode is used for shifting control, then the control system is simple, but the adaptability to different driving requirements is poor and fuel economy is low
Solution Approach 1:
The control system dynamically switches between EV mode and HEV mode based on real-time operating parameters (vehicle speed, accelerator pedal signal, current gear). This dynamic adaptation allows the system to optimize fuel economy and driving comfort for different driving conditions without requiring a completely different control system for each mode.
Solution Approach 2:
The single control system is designed to perform multiple functions by supporting both EV mode and HEV mode operations. The HCU (hybrid control unit) can execute different control strategies depending on the selected mode, making one system universally applicable to various driving requirements rather than needing separate dedicated systems.
2Adaptability or versatility
If mode switching is added to support multiple working conditions, then the adaptability and fuel economy improve, but the control complexity increases
Solution Approach 1:
The control process is segmented into distinct operational modes (EV mode and HEV mode), each with its own shifting control strategy. By dividing the control logic into mode-specific segments, the system can handle different driving conditions effectively while keeping each segment's complexity manageable rather than creating one overly complex unified control system.
Solution Approach 2:
The system uses feedback from operating parameters (vehicle speed, accelerator pedal signal, current gear) to determine the appropriate work mode and execute corresponding shifting control. This feedback mechanism allows automatic adaptation to different driving conditions without requiring complex manual intervention, simplifying the overall control architecture while expanding adaptability.
3Ease of operation
If speed adjustment and shifting control are performed under various working conditions, then smoothness and comfort improve, but the control algorithm complexity increases
Solution Approach 1:
The control system performs preliminary speed adjustment of the motor-generator before executing gear shifting operations. By pre-adjusting the motor speed to match the required speed for the target gear, the system ensures smooth transitions and maintains driving comfort without requiring overly complex real-time control algorithms during the actual shifting moment.
Data Source
AI summary
The present disclosure discloses a shifting control method for a hybrid vehicle. The shifting control method includes: detecting operating parameters of the hybrid vehicle, where the operating parameters of the hybrid vehicle includes vehicle speed, vehicle acceleration as reflected from an accelerator-pedal signal and a current gear of the hybrid vehicle; determining a work mode of the hybrid vehicle; performing speed adjustment and shifting control to the first motor-generator according to a work mode and the operating parameters of the hybrid vehicle to implement shifting control of the hybrid vehicle, where the work mode includes an electric-vehicle mode and a hybrid-electric-vehicle mode. The method considers performing speed adjustment and shifting control under various working conditions. This improves smoothness and comfort of the vehicle and enlarges the use scope. The present disclosure further discloses a power transmission system of a hybrid vehicle and a hybrid vehicle.