Steer-by-wire polarity switching for trailer maneuverability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mechanical steering systems face kinematic constraints and unintuitive reverse logic requirements during rearward operation, especially when towing a trailer, which complicates maneuverability and directional control.
Innovation Solution
A steer-by-wire system with switchable polarity electrical components that adjust the direction of roadwheel rotation based on driving conditions, allowing synchronization or asynchronization between the handwheel and roadwheel actuators to facilitate intuitive steering in forward, rearward, and rearward-with-trailer modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical steering system is used with fixed kinematic constraints, then the steering geometry is permanently fixed and reliable, but the system lacks adaptability for different driving conditions (forward, rearward, towing)
Solution Approach 1:
The patent applies dynamics by making the steering system adaptable through switchable polarity configurations. The electrical communication component can switch between first and second polarity assignments, allowing the system to dynamically adjust its behavior based on detected driving conditions (forward driving, rearward driving with or without trailer). This enables the same physical system to exhibit different functional characteristics without mechanical reconfiguration.
Solution Approach 2:
The patent changes the polarity parameter of the electrical communication component to adapt the steering system to different driving conditions. By switching between different polarity assignments (first polarity for forward driving, second polarity for rearward driving), the system modifies its operational parameters without changing its physical structure, thereby achieving versatility while maintaining system simplicity.
2Ease of operation
If the steering system uses reverse logic for rearward operation, then the mechanical constraints are satisfied, but the ease of operation deteriorates as drivers must perform counterintuitive steering inputs
Solution Approach 1:
The patent applies inversion by switching the polarity assignment when rearward driving is detected. Instead of requiring the driver to perform reverse logic (clockwise for counterclockwise cornering), the system inverts the control logic so that clockwise handwheel input produces clockwise roadwheel rotation even in reverse gear. This maintains intuitive steering operation while adapting to the reversed vehicle motion direction.
3Adaptability or versatility
If the steering system is designed for forward driving only, then the device complexity is minimized, but the adaptability to towing scenarios and rearward operation is lost
Solution Approach 1:
The patent applies universality by designing a single steering system that can perform multiple functions across different driving conditions. The electrical communication component with switchable polarity assignments enables the system to handle forward driving, rearward driving with trailers, and rearward driving without trailers using the same hardware configuration, thereby achieving multi-functionality without increasing physical device complexity.
Data Source
AI summary
A steer by wire steering system for a vehicle includes at least one electrical communication component operatively connecting a handwheel actuator to a roadwheel actuator. Also included is that the at least one electrical communication component is switchable between a first polarity assignment and a second polarity assignment based on a detected driving condition of the vehicle, the first polarity assignment turning a roadwheel in a first direction in response to a first input rotational direction of the handwheel actuator, the second polarity assignment turning the roadwheel in a second direction in response to the first input rotational direction of the handwheel actuator.