Hybrid Control Unit Torque Arbitration for Motor Safety
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Solution Overview
Problem
Hybrid vehicles face challenges in managing multiple torque requests from various sources, such as auxiliary driving, regenerative braking, and battery charging, which can lead to excessive or insufficient torque demands, potentially damaging the motor and affecting vehicle performance.
Innovation Solution
A priority-based motor torque management method that synthesizes and limits torque requests, prioritizing auxiliary driving for power performance, regenerative braking, and electricity generating modes, ensuring torque requests are within safe operational ranges and aligning with motor capabilities, using a Hybrid Control Unit (HCU) to arbitrate and send appropriate torque requests to the motor and engine control modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple torque requests are synthesized without priority arbitration, then the system can respond to all torque demands, but the motor may be damaged by excessive or insufficient torque demands
Solution Approach 1:
The patent segments torque requests into distinct categories (auxiliary driving torque, regenerative braking torque, electricity generating torque) and applies different synthesis and limitation strategies to each category. This segmentation allows the system to handle multiple torque demands while maintaining motor safety through category-specific control rules.
Solution Approach 2:
The HCU acts as an intermediary that receives torque requests from multiple sources, synthesizes them according to predefined priorities and motor capabilities, and outputs a single safe torque command to the motor. This intermediary function prevents direct conflict between opposing torque demands and protects the motor from damage.
2Reliability
If the HCU limits torque requests within proper ranges, then motor damage is prevented, but the system complexity increases due to arbitration mechanisms
Solution Approach 1:
The patent changes the parameter of torque request by applying limitation values based on motor operating states (peak torque, continuous maximum torque). This parameter transformation converts potentially damaging torque values into safe operating ranges while maintaining the essential control function.
Solution Approach 2:
The system performs preliminary synthesis and limitation of torque requests before they are executed by the motor. By pre-processing torque demands according to motor capabilities and operational priorities, the system avoids the need for complex real-time arbitration during motor operation.
3Reliability
If priority-based torque arbitration is implemented, then motor safety is ensured, but the response time for lower priority torque requests increases
Solution Approach 1:
The patent establishes torque request priorities and synthesis rules in advance, allowing the HCU to quickly determine the appropriate torque command without complex real-time decision-making. This preliminary structuring of control logic minimizes processing time while ensuring safety.
Data Source
AI summary
A motor torque management method of hybrid vehicles. The method includes torque synthesis and limitation in electric driving mode, torque synthesis and limitation in electricity generating mode, and torque arbitrating management. Wherein, the torque arbitrating management arbitrates torque according to its priority, and sends the torque request with the highest priority to a motor controller (5).