Differential Steering Control for Tractor Trailer Turning Radius
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Solution Overview
Problem
Differentially steered vehicles, such as tractors and harvesters, face limitations when towing trailers due to the risk of tight turns causing contact between the vehicle and trailer, leading to potential damage during maneuvering, as existing systems do not effectively limit the turning radius to prevent such incidents.
Innovation Solution
A control system that measures and compares the rotational speeds of the left and right wheels, adjusting them to maintain a minimum allowable turning radius by increasing or decreasing speeds as needed, and optionally alerting the operator through signals when the turning radius becomes too small, using sensors and actuators to manage wheel speed differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle performs tight turns with large wheel speed differential, then maneuverability is improved, but the risk of contact between vehicle and trailer increases causing damage
Solution Approach 1:
The control system continuously monitors the wheel speed differential and compares it against a threshold value. When the differential exceeds the threshold indicating a potentially dangerous tight turn, the system automatically provides feedback by adjusting the wheel speeds to reduce the differential, thereby preventing contact between the vehicle and trailer while maintaining operational awareness
Solution Approach 2:
The control system acts as an intermediary between the operator's steering input and the actual wheel movement. By inserting this control layer, the system can mediate the relationship between steering commands and wheel speed differential, automatically limiting the differential to prevent trailer contact while still allowing the operator to control the vehicle's turning direction
2Reliability
If the control system automatically adjusts wheel speeds to limit turning radius, then safety is improved, but the operator's direct control over steering is reduced
Solution Approach 1:
The control system applies partial automation by only intervening when the wheel speed differential exceeds the predetermined threshold. During normal operating conditions within safe parameters, the system takes no action and allows full operator control, thereby providing safety enhancement without unnecessarily restricting the operator's direct control over steering
Data Source
AI summary
The turning radius of a differentially steered vehicle towing a trailer is controlled when turning so that its turning radius is greater than a minimum allowable turning radius. The turning radius may be autonomously adjusted using a controller to monitor the instantaneous rotational speed differential between the driven wheels and increase or decrease the relative speed between the wheels when the instantaneous rotational speed differential exceeds a threshold rotational speed differential, indicating a turn which is too tight. Alternately, the turning radius may be controlled by the vehicle's operator, who receives a signal from the controller indicating that the vehicle's turning radius is less than the minimum allowable. The operator may then take action to enlarge the turning radius using manual controls.