Working Vehicle Speed Shift Restraint for Stable Travel
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Solution Overview
Problem
Working vehicles experience instability during speed changes due to the time required to connect the shifter, leading to unstable travel.
Innovation Solution
A working vehicle equipped with a speed change restraint unit that detects an increase in speed and stops the speed change process when the threshold is reached, using a solenoid valve and control device to move linkage members and revert to previous speed stages, ensuring stable travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the shifter is connected to change speed stages, then the speed of the vehicle body can be changed, but the connection time causes unstable travel
Solution Approach 1:
The control device detects the start of speed change process and preliminarily activates the increase-in-speed detection device to monitor vehicle speed changes. This preliminary detection allows the system to prepare for potential instability before it occurs, enabling timely intervention to maintain travel stability during speed transitions.
Solution Approach 2:
The increase-in-speed detection device continuously monitors vehicle speed during the speed change process and provides feedback to the control device. When the detected speed increase exceeds the threshold, the control device receives this feedback and automatically stops the speed change process, creating a closed-loop control system that maintains travel stability.
2Productivity
If the speed change process continues despite speed increase, then the speed stage change can be completed, but travel stability is compromised
Solution Approach 1:
The system implements real-time feedback monitoring during speed change processes. The increase-in-speed detection device continuously provides speed data to the control device, which compares actual speed changes against expected parameters. When deviations exceed the threshold, the feedback loop triggers automatic termination of the speed change process, preventing instability while maintaining operational efficiency.
Solution Approach 2:
The control device dynamically adjusts the speed change process based on real-time vehicle speed conditions. Rather than following a fixed speed change schedule, the system adapts its behavior by monitoring actual speed changes and automatically modifying or terminating the process when stability thresholds are violated, creating a dynamic response to changing operational conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution eliminates or reduces the likelihood of unstable travel during speed changes by canceling the speed change process when vehicle speed increases, maintaining stability even during speed adjustments.
Implementation Method 1
a solenoid valve configured to shift the movement mechanism to the stop position, the one position, or the other position using hydraulic fluid
Data Source
AI summary
A working vehicle includes: a vehicle body; a linkage device configured to link a working device to the vehicle body; a prime mover provided on the vehicle body; a traveling device configured to cause the vehicle body to travel; a transmission device configured to transmit power from the prime mover to the traveling device and perform a speed change process to change a speed of the vehicle body; an increase-in-speed detection device configured to detect an increase in speed of the vehicle body; and a speed change restraint unit configured such that, during the speed change process performed by the transmission device, when the increase in speed detected by the increase-in-speed detection device has become equal to or greater than a threshold, the speed change restraint unit stops the speed change process performed by the transmission device.