Dual-Motor Steer-by-Wire Backup Power Switching
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Solution Overview
Problem
Steer-by-wire steering systems face challenges in ensuring reliable operation when a backup power source with limited capacity is used, particularly in duplexed systems where redundancy is crucial for failsafe functionality.
Innovation Solution
The system employs a dual-system steering motor configuration with a main and sub system, where power supply is selectively managed by a controller to optimize operation using both the main and backup power sources, allowing the sub system to operate independently in backup power situations to maintain steering functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering system uses a backup power source with small capacity, then the system failsafe is improved, but the duration of operation during backup power supply deteriorates
Solution Approach 1:
The steering motor is divided into a main system and a sub system, allowing independent operation of each system. During backup power supply, only the sub system operates independently while the main system is stopped, enabling the small-capacity backup power source to sustain critical steering functions for extended duration.
Solution Approach 2:
The controller dynamically switches between different operational modes based on power supply status: normal mode (both systems operate with main power), backup mode (sub system operates independently with backup power), and transition management between modes. This dynamic adaptation maximizes operation duration during backup power supply.
2Reliability
If the steering system is duplexed with redundant systems, then the failsafe is improved, but the device complexity increases
Solution Approach 1:
The main system and sub system share common structural components and control architecture, merging redundant elements where possible while maintaining functional independence. This reduces overall system complexity compared to fully separate redundant systems.
Solution Approach 2:
Both the main system and sub system are designed with universal functionality to perform identical steering operations. The sub system can independently execute all critical steering functions, making the redundancy efficient and reducing the need for additional specialized components.
3Force
If the backup power source supplies power to both main and sub systems, then the steering force is improved, but the loss of energy increases
Solution Approach 1:
During backup power supply, the controller extracts and activates only the sub system while stopping the main system. This selective operation removes unnecessary energy consumption from the main system, allowing the small-capacity backup power source to provide adequate steering force for critical operations without excessive energy loss.
Solution Approach 2:
The sub system is designed to provide sufficient steering force for critical emergency operations without needing the full capacity of both systems. This partial action approach matches the power output to the actual minimum requirement, avoiding excessive energy consumption while maintaining adequate steering capability.
Data Source
AI summary
A steer-by-wire steering system, including a steering device including a dual-system steering motor including a main system and a sub system, wherein a power supply to the main system is conducted selectively by a main power source and a backup power source, and a power supply to the sub system is conducted by only the main power source, wherein, in a normal power-supply situation in which the power supply to the main system and to the sub system is conducted by the main power source, a controller controls the sub system to operate in accordance with the main system, and wherein, in a backup power-supply situation in which the power supply to the main system is conducted by the backup power source, the controller controls the main system not to operate or to operate while limiting the power supply to the main system and controls the sub system independently.