Work Vehicle Speed Control System with Coupling State Detection
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Solution Overview
Problem
Conventional work vehicle speed control systems experience rapid acceleration when switching from a released to a coupled state, compromising traveling safety as the vehicle speed is not adequately controlled, leading to potential safety hazards.
Innovation Solution
A work vehicle with a speed control system that includes a pair of left/right brake operation tools, a coupling member, a coupled state detector, and a controller that switches between a normal mode and a vehicle speed suppression mode. The controller maintains the vehicle speed suppression mode unless a predetermined releasing operation, such as returning the accelerator or speed change tool to a low speed or idling position, is performed, ensuring the vehicle does not exceed a predetermined speed even when high-speed commands are given.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the coupling member is switched from the released state to the coupled state, then the vehicle speed limitation is released and high speed can be achieved, but the vehicle speed accelerates rapidly which compromises traveling safety
Solution Approach 1:
The controller requires a predetermined releasing operation (such as returning the accelerator to idle position) before switching from vehicle speed suppression mode to normal mode. This preliminary action ensures that the driver intentionally confirms the mode transition, preventing accidental rapid acceleration when the coupling state changes.
Solution Approach 2:
The controller continuously monitors the operation state of the accelerator and coupling member status. When the coupling member transitions to the coupled state, the controller provides feedback by maintaining the vehicle speed suppression mode until the predetermined releasing operation is detected, ensuring safe speed control based on real-time operational feedback.
2Productivity
If the controller switches to normal mode immediately when coupled state is detected, then the targeted vehicle speed can be reached quickly, but the vehicle speed increases rapidly causing safety hazards
Solution Approach 1:
Before allowing the controller to switch to normal mode for quick speed response, the system requires a predetermined releasing operation as a preliminary confirmation step. This ensures that the driver is aware of and intends the mode transition, preventing unintended rapid acceleration while still allowing quick response when properly initiated.
Solution Approach 2:
The controller dynamically adjusts the switching conditions based on the operational state. When the coupling member transitions to coupled state, the controller maintains suppression mode dynamically until the predetermined releasing operation is detected, creating a dynamic safety mechanism that adapts to driver intent while enabling quick speed response when appropriate.
Data Source
AI summary
Work vehicle having a coupling member which is switchable between a coupled state where left/right brake operation tools are integrally coupled and a released state releasing the coupling. A coupled state detector is utilized. A controller controls a traveling state and is switchable between a first or normal mode and a second or vehicle speed suppression mode. The second or vehicle speed suppression mode can be switched back to the first or normal mode when the coupled state is detected and a predetermined releasing operation is performed.