AWD Torque Distribution Remedial Control for Sensor Faults
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Solution Overview
Problem
Current all-wheel drive (AWD) vehicle torque distribution systems fail to effectively address sensor and computational faults, which can impair the vehicle's propulsion torque distribution and potentially lose all-wheel drive capability.
Innovation Solution
A propulsion torque distribution system with a controller that classifies faults into severity levels, determines remedial actions, and adjusts torque distribution by interpolating acceleration estimates and driver torque requests to maintain vehicle stability and all-wheel drive functionality even with sensor faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the main propulsion torque distribution system uses sensor data for torque calculation, then torque distribution accuracy is improved, but system reliability deteriorates when sensor faults occur
Solution Approach 1:
The system performs preliminary fault detection by monitoring sensor data validity before torque distribution calculations. When faults are detected, the system proactively switches to alternative calculation methods or safe default values, preventing faulty sensor data from compromising torque distribution accuracy and maintaining system reliability simultaneously.
Solution Approach 2:
The controller acts as an intermediary between sensor inputs and torque distribution outputs. It validates sensor data, detects faults, and mediates by selecting appropriate data sources or calculation methods, ensuring that torque distribution maintains accuracy even when primary sensors fail, thus resolving the contradiction between measurement precision and reliability.
2Adaptability or versatility
If the system maintains all-wheel drive capability during faults, then vehicle functionality is preserved, but control complexity increases
Solution Approach 1:
The system dynamically adjusts torque distribution strategies based on fault conditions. During normal operation, it uses full sensor data for optimal AWD performance. When faults occur, it dynamically switches to alternative calculation methods or simplified torque distribution, maintaining AWD capability while adapting control complexity to the situation rather than permanently increasing it.
Solution Approach 2:
The system changes operational parameters (torque distribution ratios, sensor data weighting) based on fault detection. When sensors are faulty, it modifies calculation parameters using alternative methods or estimated values, preserving AWD functionality without requiring permanent structural complexity increases in the control system.
3Reliability
If the system implements comprehensive fault classification, then remedial action accuracy is improved, but processing time increases
Solution Approach 1:
The fault classification system is segmented into multiple hierarchical levels. The controller first performs rapid primary fault detection to identify obvious sensor failures. Then, based on the primary detection results, it applies more detailed classification only when necessary. This segmented approach improves remedial action accuracy through comprehensive classification while minimizing processing time by avoiding full classification for all conditions.
Solution Approach 2:
The system applies partial fault classification based on the severity and type of detected faults. For minor or obvious faults, it uses simplified classification to reduce processing time. For complex or uncertain faults, it implements more comprehensive classification to ensure accurate remedial actions. This selective approach balances reliability improvement with time loss mitigation.
Data Source
AI summary
A propulsion torque distribution system for a vehicle includes a controller in electronic communication with a plurality of vehicle systems. The controller executes instructions to receive at least one or more computational faults, one or more sensor faults, and a driver torque request. In response to receiving at least one of the one or more computational faults and the one or more sensor faults, the controller determines a fault that affects calculation of a primary torque request has occurred. In response to determining the fault that affects calculation of the primary torque request has occurred, the controller determines a severity of the fault. The controller determines a remedial state based on the severity of the fault. The remedial state indicates a corresponding action that is executed by the propulsion torque distribution system.