Dynamic Steering Ratio Control for Vehicle Cornering
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Solution Overview
Problem
During vehicle cornering, the steering effort varies with speed, causing the driver to adjust the steering wheel angle to maintain a desired curve radius, which can be inconvenient and require frequent corrections.
Innovation Solution
A method and system that automatically adjust the superposition angle and steering ratio based on speed to maintain a constant steering effort and curve radius, allowing the driver to keep the steering wheel angle constant, with the system adapting the steering ratio dynamically to compensate for changes in speed and physical forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the steering effort is reduced at lower speed, then the vehicle is easier to steer, but the driver must turn outward to maintain the desired curve radius, increasing steering complexity
Solution Approach 1:
The patent implements dynamic steering ratio adjustment based on vehicle speed. The control unit automatically modifies the steering ratio according to the current speed, enabling the steering system to adapt its characteristics in real-time. This resolves the contradiction by automatically compensating for speed-induced steering effort changes, maintaining consistent curve radius without requiring manual steering corrections from the driver.
Solution Approach 2:
The patent changes the steering ratio parameter as a function of vehicle speed. By dynamically adjusting this key parameter, the system compensates for the natural reduction in steering effort at lower speeds, thereby maintaining the desired curve radius automatically without requiring the driver to make additional steering adjustments.
2Device complexity
If the steering ratio is fixed, then the steering system is simpler, but the curve radius changes when steering wheel angle remains constant, requiring driver correction
Solution Approach 1:
The patent transitions from a fixed steering ratio to a dynamic, speed-dependent steering ratio. The control unit continuously adjusts the steering ratio based on detected vehicle speed, enabling the system to maintain a stable curve radius despite speed variations. This dynamic approach resolves the contradiction by automatically compensating for the natural tendency of curve radius to change with speed.
Solution Approach 2:
The patent implements a feedback control mechanism where the control unit monitors vehicle speed and automatically adjusts the steering ratio accordingly. This closed-loop control ensures that the curve radius remains stable by continuously compensating for speed-induced variations, eliminating the need for manual driver corrections.
3Stability of the object's composition
If the steering effort is greater at higher speed, then the vehicle provides better stability, but the driver experiences increased steering workload
Solution Approach 1:
The patent dynamically adjusts the steering ratio based on vehicle speed to optimize the balance between stability and ease of operation. At higher speeds, the system maintains appropriate steering effort levels through automatic ratio adjustment, preventing excessive steering workload while preserving vehicle stability during cornering maneuvers.
Data Source
AI summary
A method for steering a vehicle that comprises a steering system with a steering wheel and a front axle as well as a rear axle with wheels, wherein it is provided that a direction of the vehicle is adjusted manually by a driver of the vehicle by adjustment of a steering wheel angle of the steering wheel, as a result of which, for the wheels of at least one of the axles, a steering angle is adjusted, which is obtained from the steering wheel angle plus a superposition angle, wherein, through an automatically adjustable steering ratio for the wheels of at least one of the axles, a ratio of the steering wheel angle to the steering angle for the wheels is set, wherein the vehicle travels into a curve on a circular path with a radius at a speed with a first value, wherein a steering wheel angle is adjusted by the driver.