Reverse Steering Control for Flat-Towed Vehicle Jackknife Prevention
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Solution Overview
Problem
Flat-towed vehicles often jackknife when reversing due to steering geometry, limiting the distance they can be safely reversed without causing damage to the tow bar and vehicles involved.
Innovation Solution
A power steering mechanism with an electronic control unit (ECU) that receives signals from the towing vehicle's reverse lights to actuate the wheels of the flat-towed vehicle, steering them to a straight position, preventing jackknifing, and a hybrid transaxle that is splash lubricated to prevent damage during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the steering system is free to turn with the towing vehicle, then the flat-towed vehicle can follow the towing vehicle during forward motion, but the flat-towed vehicle jackknifes behind the towing vehicle when reversing
Solution Approach 1:
The steering system dynamically adjusts its behavior based on the towing vehicle's direction of travel. During forward motion, the steering wheel is free to turn with the towing vehicle for easy following. During reverse motion, the power steering mechanism actively intervenes to maintain straight wheel alignment, preventing jackknife. This dynamic adaptation resolves the contradiction between ease of operation and reversing safety.
Solution Approach 2:
The system uses feedback from the reverse light signal to detect when the towing vehicle is reversing. The ECU receives this signal and activates the power steering mechanism accordingly. This feedback loop enables the steering system to automatically adjust its control strategy based on the operational context, ensuring safety during reverse while maintaining ease of operation during forward motion.
2Reliability
If the flat-towed vehicle is reversed for a short distance only, then damage to the tow bar and vehicles is prevented, but the reversing distance is limited and operation is constrained
Solution Approach 1:
The power steering system provides self-service by automatically maintaining straight wheel alignment during reverse motion without requiring manual intervention from the towing vehicle operator. The ECU continuously monitors the reverse light signal and adjusts steering as needed, enabling the system to serve itself and eliminate the need for operator awareness or action regarding steering control during reverse.
Solution Approach 2:
The patent replaces passive mechanical steering geometry with an active power steering system controlled by an ECU. Instead of relying solely on mechanical linkages and free-steering geometry, the system uses electronic control and powered actuation to maintain proper wheel alignment during reverse, substituting mechanical limitations with electronically controlled precision.
3Reliability
If a power steering mechanism is added to control wheels during reverse, then steering control is improved, but device complexity increases
Solution Approach 1:
The power steering mechanism serves multiple functions: it provides normal power steering assistance during forward motion and actively maintains straight wheel alignment during reverse motion. The ECU and connector leverage existing vehicle components (reverse lights, electrical system) rather than requiring entirely new sensing systems. This multi-functionality reduces the need for additional dedicated components, mitigating the increase in system complexity.
Data Source
AI summary
Systems, apparatus, and methods for steering one or more wheels of a flat-towed vehicle moving in reverse. A system may include a power steering mechanism configured to steer the one or more wheels. The system may further include a connector configured to carry one or more signals from a towing vehicle to the flat-towed vehicle. The system may further include an electronic control unit (ECU) coupled to the power steering mechanism and the connector. The ECU may receive a signal that one or more reverse lights of the towing vehicle are lit or on. The ECU may be configured to actuate the power steering mechanism to steer the one or more wheels to a straight position upon receiving the signal.