Hybrid Powertrain Torque Control Method for Consistent Driver Feel
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Solution Overview
Problem
Hybrid vehicles face challenges in smoothly distributing power between multiple power sources, affecting the reliability and responsiveness of their power-trains, as existing methods struggle to ensure consistent torque output and driver satisfaction across various operation modes.
Innovation Solution
A hybrid power-train torque control method that interprets driver torque requirements through calculating maximum torque ability, desired load rate, torque distribution, and filtering, and coordinates torque between power sources using energy management and efficiency optimization strategies, ensuring consistent torque output and ride comfort across different modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If torque is distributed between multiple power sources in hybrid vehicles, then power output capability is improved, but torque consistency and ride comfort deteriorate due to complex operation modes and response characteristic differences
Solution Approach 1:
The control method calculates the maximum torque ability of the hybrid power-train in advance and uses this pre-calculated value to determine the driver's desired load rate. By preparing the torque distribution strategy beforehand based on current power-train state, the system ensures consistent torque output across different operation modes without waiting for mode transitions to occur
Solution Approach 2:
The system continuously monitors the current state of power-train components (traction batteries, motors, engine) and adjusts torque distribution based on real-time feedback. The maximum torque ability is recalculated as the state of components changes, ensuring that torque consistency is maintained dynamically across varying operating conditions and mode transitions
2Adaptability or versatility
If multiple operation modes are included in hybrid power-train, then adaptability is improved, but device complexity increases due to multiple power source torque coupling modes
Solution Approach 1:
The control method uses a universal torque distribution approach that works across all operation modes (parallel mode, pure electric drive mode, serial mode). Instead of implementing separate control strategies for each mode, the system calculates maximum torque ability and distributes torque based on a unified methodology that adapts to any current operation mode, thereby reducing control system complexity while maintaining multi-mode adaptability
Solution Approach 2:
The system changes the parameter of maximum torque ability calculation based on the current operation mode and component states. By adjusting this key parameter dynamically, the unified control method can accommodate different operation modes without requiring complex mode-specific control logic, thus simplifying the overall control system while maintaining versatility
3Reliability
If torque requirement filtering is applied, then ride comfort is improved by reducing vibration, but response time deteriorates due to torque change rate limitation
Solution Approach 1:
The filtering approach is made dynamic by adjusting the torque change rate limitation based on current operating conditions. The system dynamically modifies the filtering characteristics according to the calculated maximum torque ability and current operation mode, allowing faster torque response when high performance is needed while maintaining smooth torque delivery for ride comfort during normal operation, thus balancing response time and comfort requirements
Data Source
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AI summary
The disclosure discloses a hybrid vehicle and a power-train torque control method, the method comprising the steps of: (1) driver torque requirement interpretation; and (2) multi-power source torque distribution and coordination. The hybrid power-train torque control method can ensure a consistent driving feeling of the driver within real-time power source torque ability and facilitate match calibration of the hybrid power-train.