Turning Control Device Differential Braking Tight Turns
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Solution Overview
Problem
Conventional electric power steering devices experience increased steering torque at the end contact state of the steering wheel, leading to uncomfortable vehicle turning experiences for drivers, especially when attempting tighter turns or parking in narrow spaces.
Innovation Solution
A turning control device that integrates a steer-by-wire system and a brake system, utilizing microcomputers to calculate and apply a braking force difference between the left and right tire wheels, allowing for a smaller turning radius when the steering angle exceeds a threshold, thereby reducing steering wheel torque and enhancing driver comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the steering wheel is turned to the end contact state for tighter turning, then the turning radius is reduced, but the steering torque increases drastically causing uncomfortable feeling
Solution Approach 1:
The patent combines the steering system with the brake system to achieve tight turning. Instead of relying solely on the turning device which causes high steering torque at end contact, the system merges braking function with steering function to enable tight turning through differential braking forces.
Solution Approach 2:
The patent replaces the mechanical steering torque-based turning mechanism with a brake-based differential force mechanism. When tight turning is needed, the system substitutes the traditional mechanical steering approach with electronic control of braking forces on individual wheels, eliminating the need for high steering torque.
2Length of moving object
If the steering wheel is turned beyond the maximum angle for tighter turning, then the turning radius is further reduced, but the steering torque increases causing vehicle turning state change even without rotation
Solution Approach 1:
The patent introduces the brake system as an intermediary mechanism between the driver's steering input and the vehicle's turning motion. When the steering wheel reaches maximum angle, the brake system acts as a mediator to achieve additional turning effect through differential braking, preventing the need for the driver to apply excessive force to the steering wheel.
Solution Approach 2:
The patent changes the control parameter from steering torque to braking force difference. Instead of increasing steering torque to achieve tighter turns, the system changes to controlling differential braking forces, which provides a more comfortable and controllable method for achieving tight turning radii.
3Length of moving object
If only the turning device is used for turning, then the system is simpler, but the turning radius cannot be made sufficiently small for narrow space parking
Solution Approach 1:
The patent makes the brake system multi-functional by giving it both its traditional braking function and an additional function of enabling tight turning through differential braking. This universal approach allows the existing brake system to serve dual purposes, achieving tight turning capability without adding a completely separate turning mechanism.
Solution Approach 2:
The patent enables the brake system to serve itself by using the same brake actuators and control infrastructure for both normal braking and tight turning operations. The brake system performs tight turning as a self-service function using its existing components, eliminating the need for separate dedicated turning devices.
Data Source
AI summary
A turning control device is provided for use in a vehicle control system including a steer-by-wire system and a brake system. The turning control device is configured to calculate a braking force difference, which is a difference in braking force between the left and right tire wheels. The turning control device is further configured to perform a high turning control that provides the braking force difference to the left and right tire wheels to cause a smaller turning radius of the vehicle when a steering angle corresponding value is larger than a judgment threshold.