Reverse Wheel Torque Control for Tight-Space Vehicle Maneuvering
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Solution Overview
Problem
Conventional reverse driving methods require drivers to use different motor skills and can be challenging, especially in tight spaces or challenging environmental conditions, where drivers must make complex spatial judgments and navigate without sufficient turning space.
Innovation Solution
Implementing reverse dig and drive modes in electric vehicles, where torque can be applied independently to each tire, and steering controls are inverted to mimic forward driving characteristics, allowing for more familiar handling and improved navigation in reverse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional reverse driving methods are used, then drivers can navigate in reverse, but driver comfort and control familiarity deteriorate due to different motor skills and complex spatial judgments required
Solution Approach 1:
The patent inverts the steering control system so that turning the steering wheel right causes the vehicle to turn right in reverse, opposite to conventional behavior. This inversion makes reverse driving feel familiar to drivers who are accustomed to forward driving controls, thereby improving ease of operation and driver comfort while maintaining the ability to navigate in reverse
2Adaptability or versatility
If conventional reverse driving is used in tight spaces, then vehicles can backtrack, but turning capability deteriorates due to insufficient space for K-turns or U-turns
Solution Approach 1:
The patent segments the torque delivery to each wheel independently, allowing different torque values to be applied to left and right wheels. This independent wheel control enables the vehicle to execute tight turning maneuvers in reverse by applying differential torque, effectively reducing the turn radius and enabling backtracking in confined spaces where conventional methods would require larger turning areas
Solution Approach 2:
The system dynamically adjusts torque distribution to each wheel based on steering input and vehicle state. During reverse operation with inverted steering, the controller continuously modulates torque to front and rear wheels to achieve the desired tight turning path, making the turn radius adaptable rather than fixed
3Length of moving object
If independent torque control is implemented in reverse mode, then turn radius is reduced for better navigation, but steering control complexity increases
Solution Approach 1:
The patent replaces the mechanical steering connection with an electronic control system that interprets steering wheel input and translates it into appropriate torque commands for each wheel. This substitution allows the complex task of differential torque control to be managed through software algorithms rather than complex mechanical linkages, achieving reduced turn radius while keeping the physical steering system relatively simple
Data Source
AI summary
Systems and methods for implementing reverse dig mode and/or reverse drive mode. Reverse dig mode may involve determining an inner front wheel and outer front wheel relative to steering controls and simultaneously applying a forward torque to the inner front wheel of the vehicle and a reverse torque to the outer front wheel of the vehicle. Reverse drive mode may involve determining steering controls of a vehicle and applying inverted controls to the rear wheels of the vehicle that provides a simulated sense that the driver is handling the vehicle in the forward direction.