Vehicle Yaw Control With Driver-Adaptive Steering Compensation
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Solution Overview
Problem
Existing vehicle control systems fail to appropriately control yaw motion when drivers have physical limitations, such as upper limb disabilities or injuries, as they do not account for varying steering abilities.
Innovation Solution
A vehicle control system that includes a yaw motion control unit capable of acquiring vehicle speed, driver operable range, and operation amount, calculating an addition amount to be added to the operation amount, and outputting it to the steering system, thereby compensating for limited steering ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the steering system is designed for standard drivers with full physical ability, then the vehicle control system works normally for able-bodied drivers, but drivers with physical limitations cannot operate the input unit within the required range
Solution Approach 1:
The control unit dynamically changes the steering gear ratio parameter based on detected driver physical conditions. When a driver with limited operable range is detected, the system increases the steering gear ratio to amplify the limited input motion, thereby achieving adequate steering wheel rotation without modifying the physical steering system.
Solution Approach 2:
The steering system transitions from a fixed gear ratio to a dynamically adjustable gear ratio that adapts in real-time to the driver's physical capabilities. The control unit continuously monitors operable range and adjusts the steering gear ratio accordingly, making the system flexible and adaptable to different driver conditions.
2Ease of operation
If the operable range of the input unit is increased to accommodate drivers with limitations, then drivers with physical limitations can operate the steering system, but the vehicle may become unstable at high speeds
Solution Approach 1:
The system applies partial action by adjusting the steering gear ratio based on the driver's actual operable range rather than providing full amplification always. When a driver has limited operable range, the system provides excessive amplification to compensate, but when the driver has full range, the system uses normal or reduced amplification to maintain stability, thus avoiding over-steering.
Solution Approach 2:
The control unit continuously detects the driver's operable range and vehicle speed, then adjusts the steering gear ratio in real-time based on this feedback. The system monitors the relationship between input unit operation and actual steering response, and modifies the gear ratio to maintain optimal balance between ease of operation and vehicle stability under varying conditions.
3Ease of operation
If the steering gear ratio is increased to amplify limited driver input, then drivers with physical limitations achieve sufficient steering input, but the steering response becomes overly sensitive
Solution Approach 1:
The system applies partial amplification by adjusting the steering gear ratio according to the specific driver's needs rather than using fixed high amplification for all cases. The control unit calculates the appropriate gear ratio based on the detected operable range, providing just enough amplification to achieve sufficient steering input without excessive sensitivity that would compromise precision.
Data Source
AI summary
A vehicle control system controls a yaw motion of a vehicle generated by an operation of an input unit in a steering system of the vehicle. A yaw motion control unit acquires information on a vehicle speed of the vehicle, an operable range of the input unit by a driver of the vehicle, and an operation amount of the input unit, calculates an addition amount that is to be added to the operation amount according to the operable range, and outputs a calculated addition amount to the steering system.