Dual ECU Steering Torque Scaling for Redundancy
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Solution Overview
Problem
Steering systems in vehicles lack redundancy, which can lead to understeer and loss of control if one of the electronic control units (ECUs) fails or has reduced performance, potentially causing safety issues during vehicle operation.
Innovation Solution
A dual ECU system where each ECU is connected to a steering-system motor, with a computer program that adjusts torque signals based on performance capabilities, ensuring that if one ECU fails or has reduced performance, the other ECU can compensate by increasing its output to maintain vehicle steering functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single ECU is used to control the steering system, then the device complexity is reduced, but the reliability decreases due to lack of redundancy
Solution Approach 1:
The control system is segmented into multiple independent ECUs (first ECU and second ECU), each capable of independently controlling the steering-system motor. This segmentation provides redundancy so that if one ECU fails, the other can take over, thereby improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
Each ECU is equipped with specific performance capabilities and torque-scaling values tailored to its operational characteristics. The system allows different ECUs to have different performance levels and compensation capabilities, enabling optimized local control strategies that improve overall system reliability while managing complexity.
2Reliability
If one ECU has reduced performance capability, then the steering system can continue operating, but the productivity decreases due to understeer and loss of control
Solution Approach 1:
The system continuously monitors the performance capability of each ECU and uses feedback to dynamically adjust torque distribution. When one ECU experiences reduced performance, the system detects this condition and automatically compensates by adjusting the torque-scaling values, thereby maintaining steering control effectiveness and preventing understeer.
Solution Approach 2:
The system changes operational parameters (torque-scaling values) based on the real-time performance capability of each ECU. By dynamically adjusting these parameters, the system maintains optimal steering control even when one ECU has reduced performance, thus preserving productivity while ensuring continued operation.
3Reliability
If torque scaling is applied to compensate for reduced ECU performance, then the reliability is improved, but the device complexity increases due to additional control calculations
Solution Approach 1:
The system pre-calculates and stores torque-scaling values for different performance scenarios before actual operation. By preparing compensation strategies in advance, the system reduces the complexity of real-time control calculations while maintaining the ability to provide reliable torque distribution when ECU performance varies.
Data Source
AI summary
A system for a vehicle includes first and second electronic control units (ECUs) each electrically connected to a steering-system motor, and a computer. The computer is programmed to instruct the first and second ECUs to each provide one-half of a value of a torque signal to the steering-system motor upon determining that both ECUs have a full performance capability.