Differential Lock Control for Work Vehicles
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Solution Overview
Problem
Existing differential lock systems in work vehicles lack automatic control mechanisms to determine when the vehicle is traveling in a straight direction, leading to inefficient traction and potential wheel spinning due to lack of differential locking during straight travel.
Innovation Solution
A differential lock control system comprising a sensor unit and a controller that uses articulation and steering angle sensors to determine if the vehicle is traveling in a straight direction, automatically activating the differential lock when within a specific tolerance of zero turn angle and de-activating it when turning, thereby optimizing traction by preventing relative rotation between ground-engaging wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the differential lock is manually controlled or left inactive, then the system structure remains simple, but wheel slippage increases and traction efficiency deteriorates during straight travel
Solution Approach 1:
The differential lock control system automatically determines vehicle orientation using sensors (articulation angle sensor and steering angle sensor) and autonomously activates or deactivates the differential lock without operator intervention. The controller calculates turn angle by summing articulation and steering angles, and automatically commands differential lock activation when the vehicle is traveling straight, eliminating the need for manual control while improving traction efficiency
Solution Approach 2:
The patent replaces manual mechanical control of the differential lock with an automated electronic control system. Sensors detect vehicle orientation parameters, the controller processes this information electronically, and automatically actuates the differential lock mechanism, substituting human-operated mechanical systems with sensor-based electronic control to improve responsiveness and traction
2Reliability
If the differential lock is activated during turning, then wheel slippage is reduced, but the vehicle loses steering capability and maneuverability
Solution Approach 1:
The differential lock control system dynamically adjusts its state based on real-time vehicle orientation. The controller continuously monitors articulation and steering angles, calculates the turn angle, and automatically transitions the differential lock between locked and unlocked states. This dynamic control ensures the differential lock is activated only during straight travel (improving traction reliability) and deactivated during turning (preserving steering adaptability)
3Productivity
If automatic control based on turn angle is implemented, then wheel slippage is prevented during straight travel, but the device complexity increases due to additional sensors and control logic
Solution Approach 1:
The control system utilizes existing vehicle sensors (articulation angle sensor and steering angle sensor) that serve multiple functions in the vehicle's operation. By processing the outputs of these multi-functional sensors through the controller, the system achieves automatic differential lock control without requiring entirely new dedicated sensing components, thereby improving wheel utilization efficiency while limiting the increase in overall device complexity
Data Source
AI summary
A differential lock control system for controlling a differential lock of a work vehicle is adapted to determine if the work vehicle is oriented to travel in a generally straight direction, and, if the work vehicle is so oriented, automatically command activation of the differential lock. An associated method is disclosed.