Vehicle Turning Radius Reduction via Rear Tire Speed Control
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Solution Overview
Problem
Existing methods for reducing the minimum rotation radius of a vehicle during turning, such as variable rack stroke systems and rear wheel steering, increase the number of parts, weight, and cost, while also potentially deteriorating marketability due to increased minimum rotation radius.
Innovation Solution
A system and method that utilize speed control of the rear internal tire by a braking controller, which detects steering angles and vehicle speeds to adjust the rear internal wheel speed, reducing the minimum rotation radius through targeted speed reduction without relying on existing variable rack stroke or rear wheel steering systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stroke of the rack of the steering is reduced to prevent interference with the tire, then the basic vehicle body structure remains unchanged, but the minimum rotation radius increases
Solution Approach 1:
The patent changes the speed parameter of the rear internal tire by applying braking force, causing the rear internal tire to rotate slower than the rear external tire during turning. This speed differential generates rotation moment that reduces the minimum rotation radius, resolving the contradiction between maintaining basic vehicle body structure and achieving smaller turning radius
Solution Approach 2:
The patent replaces the mechanical steering systems (variable rack stroke system or rear wheel steering system) with a braking control mechanism. By using the braking controller to control rear internal tire speed, the system achieves minimum rotation radius reduction without the complex mechanical structures of traditional steering modification systems
2Speed
If a variable rack stroke system or rear wheel steering system is used to reduce the minimum rotation radius, then the turning performance improves, but the number of parts, weight and cost increase
Solution Approach 1:
The patent makes the braking controller serve multiple functions: it not only performs standard braking operations but also controls the speed of the rear internal tire during turning to reduce minimum rotation radius. This multi-functionality eliminates the need for separate variable rack stroke or rear wheel steering systems, reducing part count and complexity
Solution Approach 2:
The patent merges the minimum rotation radius reduction function into the existing braking system. The braking controller is configured to control both regular braking and the speed differential of rear internal tire during turning, combining two previously separate functions into one integrated system
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
Effectively reduces the minimum rotation radius during vehicle turns by generating rotation moment through controlled rear internal tire speed, preventing tire interference and enhancing turning performance without increasing costs or complexity.
Implementation Method 1
a control mode for decreasing a speed of the rear internal tire in the turning direction, based on a speed difference between the rear internal tire and the rear external tire
Implementation Method 2
generating rotation moment of the vehicle through speed control of a rear internal tire in a turning direction
Data Source
AI summary
A system for controlling turning of vehicle may include a steering angle detection sensor; a front inner wheel speed detection sensor detecting a front inner wheel speed; a front outer wheel speed detection sensor detecting a front outer wheel speed; a rear outer wheel speed detection sensor detecting a rear outer wheel speed based on a turning direction; and a braking controller receiving detection signal of the steering angle detection sensor to determine that the vehicle turns, estimating the rear inner wheel speed in the turning direction based on detection signals of the front inner wheel speed detection sensor and the front outer wheel speed detection sensor and detection signal of the rear outer wheel speed detection sensor, and executing a mode for decreasing the estimated speed as compared to the rear outer wheel speed, as a control mode for reducing a minimum rotation radius at the time of turning.