Steering Controller Dynamic Process Ratio Adjustment
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Solution Overview
Problem
Conventional steer-by-wire steering systems face a significant processing load challenge due to the simultaneous execution of main and auxiliary processes, leading to increased costs and reduced utility, as they require high-performance controllers to manage both processes effectively.
Innovation Solution
A steering system that dynamically adjusts the execution ratios of the main and auxiliary processes based on circumstances, allowing the controller to prioritize processing load management by allocating more resources to either process as needed, thereby optimizing overall processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller executes both main process (steering control) and auxiliary process (failure diagnosis) simultaneously, then the steering system maintains high reliability through comprehensive monitoring, but the processing load on the controller becomes excessive
Solution Approach 1:
The controller dynamically adjusts the execution ratio between main process and auxiliary process based on real-time conditions. When failure risk is low, the auxiliary process executes at a lower ratio to reduce load; when failure risk increases, the execution ratio is increased to enhance monitoring. This dynamic adjustment resolves the contradiction by making the system adaptable to different operational states.
Solution Approach 2:
The system changes the execution ratio parameter of the auxiliary process based on detected failure risks. By modifying this parameter according to system state, the controller optimizes the balance between reliability monitoring and processing load, avoiding constant high-intensity execution of auxiliary functions.
2Productivity
If a high-performance controller is used to handle both main and auxiliary processes, then processing capacity is sufficient, but the cost of the steering system increases
Solution Approach 1:
Instead of continuously executing the auxiliary process at full capacity, the system applies partial action by adjusting the execution ratio based on actual needs. The auxiliary process is executed at a lower ratio during normal operation and increased only when necessary, allowing the use of a standard controller rather than requiring an over-specified high-performance controller.
Solution Approach 2:
The dynamic adjustment of execution ratios enables a standard controller to handle variable processing demands. By scaling the auxiliary process execution according to failure risk levels, the system achieves high-performance capabilities when needed while maintaining cost-effectiveness through standard hardware during normal operation.
3Reliability
If the auxiliary process is executed on a higher priority basis, then failure diagnosis is enhanced, but the steering control responsiveness may be compromised
Solution Approach 1:
The execution ratio of the auxiliary process is dynamically adjusted based on failure risk assessment. When failure risk is low, the auxiliary process runs at a lower ratio, preserving steering control responsiveness. When failure indicators increase, the execution ratio is raised to prioritize diagnostic functions, thus dynamically balancing reliability monitoring with control responsiveness.
Solution Approach 2:
The system changes the execution ratio parameter of the auxiliary process based on detected conditions. This parameter adjustment allows the controller to optimize the balance between failure diagnosis and steering responsiveness without fixed priority assignments, adapting to real-time system state.
Data Source
AI summary
A steering system of a vehicle, including an operation member to be operated by a driver, a steering device configured to steer a wheel, and a controller configured to control the steering system, wherein the controller is configured to parallelly execute a main process including a process in which the controller controls the steering device to perform steering in accordance with an operation of the operation member and an auxiliary process relating to an operation of the steering system and configured to change an execution ratio of the main process and an execution ratio of the auxiliary process.