Variable Ackermann Steering Geometry for Dynamic Handling
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Solution Overview
Problem
Existing steering systems are unable to dynamically adjust Ackermann geometry in response to changing vehicle conditions such as speed, surface, and load, leading to suboptimal handling and increased tire wear, as the Ackermann geometry remains fixed once set.
Innovation Solution
The introduction of a variable Ackermann steering system that uses a double rack/pinion mechanism, where each wheel has a dedicated rack and pinion set, allowing independent adjustment of the turning angle of the inside wheel relative to the outside wheel while maintaining constant toe, enabling adaptation of Ackermann geometry to different driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed Ackermann geometry steering system is used, then the structure is simple and reliable, but the handling performance is suboptimal under varying vehicle conditions
Solution Approach 1:
The patent implements a variable Ackermann geometry system where the steering linkage can dynamically adjust the Ackermann angle based on vehicle speed and steering conditions. The system transitions from a fixed geometric configuration to a dynamic one that adapts in real-time, allowing the inner and outer wheel angles to vary independently according to actual driving needs, thereby resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The patent changes the geometric parameters of the steering system by allowing the Ackermann angle to vary rather than remain constant. Through mechanical linkages and control systems, the patent adjusts the relative positions and angles of steering components to optimize wheel alignment under different vehicle speeds and steering inputs, enabling adaptive handling performance without requiring complete system redesign.
2Reliability
If a variable Ackermann geometry system is implemented, then handling performance and tire grip are optimized, but the system complexity increases
Solution Approach 1:
The patent divides the steering system into independent controllable segments, with separate control mechanisms for the inner wheel and outer wheel. This segmentation allows each wheel to be optimized independently for its specific steering role, improving overall vehicle stability and safety while managing complexity through modular design rather than requiring a completely new integrated system.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor vehicle speed, steering wheel position, and road conditions to dynamically adjust the Ackermann geometry. This feedback control ensures that the variable geometry system maintains optimal performance and vehicle stability while preventing excessive complexity through intelligent control algorithms that adapt to actual driving conditions rather than requiring complex mechanical adjustments for all scenarios.
3Ease of manufacture
If Ackermann geometry is fixed, then manufacturing and maintenance are easier, but tire wear increases due to suboptimal handling
Solution Approach 1:
The patent implements dynamic adjustment of Ackermann geometry that automatically optimizes wheel alignment angles based on vehicle speed and steering conditions. This dynamic optimization ensures minimal tire slippage and optimal contact patches during turning maneuvers, significantly reducing tire wear compared to fixed geometry systems, while maintaining reasonable manufacturing complexity through established mechanical adjustment mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system improves safety, efficiency, and performance by allowing real-time adjustment of Ackermann geometry, optimizing tire grip and reducing tire wear, and enhancing vehicle stability across varying road conditions.
Implementation Method 1
Many modern cars use rack and pinion steering mechanisms, where the steering wheel turns the pinion gear; the pinion moves the rack, which is a sort of linear gear which meshes with the pinion, from side to side.
Implementation Method 2
the steering column turns a large screw (the 'worm gear') which meshes with a sector of a gear, causing it to rotate about its axis as the worm gear is turned
Implementation Method 3
The recirculating ball adaptation of this design reduces the considerable friction by placing large ball bearings between the teeth of the worm and those of the screw
Data Source
AI summary
The disclosed steering systems allow Ackermann geometry (i.e., the angle of a vehicle's wheels in relation to each other) to vary at any given angle set by the steering wheel.