Steering Control Using Self-Aligning Torque for Stable Return
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Solution Overview
Problem
Existing steering devices experience torque loss during turning back due to a delay in self-aligning torque input, which affects the stability of the vehicle's turning performance.
Innovation Solution
A steering control device that calculates a steering control amount by incorporating self-aligning torque caused by the vehicle's motion state and a basic control amount, thereby improving the stability of turning back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If self-aligning torque is calculated based on vehicle motion state amount, then steering control precision is improved, but calculation complexity increases
Solution Approach 1:
The system pre-calculates and stores self-aligning torque values in a lookup table based on vehicle speed and steering angle conditions. During actual steering operation, the control unit simply queries this pre-prepared table rather than performing complex real-time calculations, thus achieving precise steering control while keeping the computational burden minimal.
Solution Approach 2:
Instead of directly computing self-aligning torque from first principles during steering operations, the system creates a simplified representation by storing pre-computed torque values in a table structure. This copied data structure allows rapid retrieval and application of accurate self-aligning torque values without repeating the complex calculation process.
2Stability of the object's composition
If steering control amount is adjusted to compensate for torque loss, then turning back stability is improved, but control system complexity increases
Solution Approach 1:
The control unit continuously monitors the actual steering torque and compares it with the target torque value. When a discrepancy is detected (indicating torque loss), the system automatically adjusts the steering control amount to compensate for the deviation. This closed-loop feedback mechanism ensures stable turning back performance while maintaining a relatively simple control architecture.
Solution Approach 2:
The system proactively compensates for anticipated torque loss by pre-adjusting the steering control amount based on predicted vehicle behavior during turning operations. By applying counteracting torque adjustments before the actual turning maneuver, the system prevents stability issues rather than reacting to them, thereby simplifying the overall control strategy.
Data Source
AI summary
A steering control device which calculates a steering control amount for controlling steering of a vehicle includes a basic control amount calculation unit which calculate a basic control amount, and a steering control amount arithmetic unit which calculates the steering control amount with reference to self-aligning torque caused by a motion state amount of the vehicle and the basic control amount.