Work Vehicle Speed-Based Differential Lock Control
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Solution Overview
Problem
Existing work vehicles require complex mechanical interlocking systems for operating differential lock and drive-wheel switchover devices, leading to potential frictional wear and damage during high-speed travel, and necessitate manual operation adjustments when speed changes.
Innovation Solution
A work vehicle design featuring electrically connected actuators and operational tools that automatically control differential lock and drive-wheel switchover devices based on vehicle speed, eliminating the need for mechanical interlocking and reducing manual operation requirements, with actuator control sections that refrain from driving during high-speed travel and automatically engage when speed drops below reference thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical interlocking systems are used to operate differential lock and drive-wheel switchover devices, then the devices can be controlled, but the arrangement becomes complex and frictional wear occurs during high-speed travel
Solution Approach 1:
The patent replaces the mechanical interlocking system with an electrical control system. The operational tools (pedal and lever) are no longer mechanically connected to the differential lock device and drive-wheel switchover device via wires. Instead, they are electrically connected through actuators that receive control signals from a control device, eliminating the complex mechanical linkage and reducing frictional wear.
2Ease of operation
If mechanical interlocking systems are used for differential lock and drive-wheel switchover devices, then direct control is achieved, but repeated manual operations are required during speed changes
Solution Approach 1:
The control device receives signals from a vehicle speed detection device and automatically controls the actuators based on the detected vehicle speed. When the vehicle speed falls within a predetermined range, the control device automatically operates the differential lock device and drive-wheel switchover device without requiring manual intervention, thereby reducing the time and effort needed for repeated operations during speed changes.
3Speed
If actuators are driven during high-speed travel, then operational responsiveness is maintained, but frictional wear and damage occur in the members
Solution Approach 1:
The control device dynamically adjusts the operation of the actuators based on the detected vehicle speed. When the vehicle speed exceeds a predetermined threshold, the control device prohibits the actuators from operating, even if the operational tools are actuated. This dynamic control prevents frictional wear and damage to the members during high-speed travel while maintaining operational responsiveness when the vehicle is traveling at appropriate speeds.
Data Source
AI summary
A work vehicle includes a first actuator driving a differential lock device, a second actuator driving the drive-wheel switchover device, a first operational tool for operating driving of the first actuator, a second operational tool for operating driving of the second actuator and a control device. The control device includes a first driving section configured to drive the first actuator in response to a manual operation on the first operational tool and a second driving section configured to drive the second actuator in response to a manual operation on the second operational tool.