Input Clutch Control Device for Work Vehicle
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Solution Overview
Problem
The rapid depression and release of the brake pedal during excavation work cause rapid engagement of the input clutch, leading to large torque variations, wear, and reduced durability, necessitating a solution to prevent rapid engagement and enable accurate fine adjustments with high responsiveness.
Innovation Solution
A control device for the input clutch that includes an orifice in the oil passage, input clutch pressure control means, clutch pressure detection, and determination means to adjust the original pressure and limit the rising speed of the clutch pressure, preventing rapid engagement and allowing for precise clutch pressure adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the brake pedal is rapidly returned from the depressed state to the undepressed state for releasing the brake, then the brake release responsiveness is improved, but the clutch pressure rises rapidly causing large torque variation and shock to the operator and vehicle
Solution Approach 1:
The control device introduces an intermediary control mechanism between the brake pedal and the clutch pressure. The determination means detects brake pedal operations and acts as an intermediary to decide whether to allow rapid clutch pressure rise, while the original pressure control means mediates the actual pressure adjustment to prevent harmful torque variations
Solution Approach 2:
The system implements feedback control by continuously monitoring brake pedal operations through the determination means and adjusting the clutch pressure accordingly. When rapid brake release is detected, the feedback loop triggers the original pressure control means to limit the clutch pressure rising speed, preventing harmful torque variations while still allowing responsive brake release
2Measurement precision
If the clutch pressure is varied rapidly to enable fine adjustment of vehicle body speed with high responsiveness, then the fine adjustment accuracy is improved, but the input clutch is subjected to large load causing rapid wear and reduced durability
Solution Approach 1:
The system dynamically adjusts the clutch pressure based on operating conditions. The determination means detects whether the brake pedal is being operated for fine adjustment purposes, and the original pressure control means dynamically modifies the pressure rising characteristics to balance responsiveness with clutch protection, allowing high-accuracy adjustment only when appropriate
Solution Approach 2:
The control device changes the pressure parameters dynamically. When fine adjustment is detected, the system allows faster pressure variation for accuracy, but when not in fine adjustment mode, it limits the pressure rising speed to protect the clutch, effectively changing the operational parameters based on detected 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
The solution prevents rapid engagement of the input clutch when the brake is released, suppressing large torque variations and enabling high-accuracy fine adjustments by varying the clutch pressure with high responsiveness to brake pedal changes.
Implementation Method 1
an orifice provided on an oil passage supplying pressure oil to the input clutch, the orifice having an original pressure at an upstream side and a clutch pressure of the input clutch at a downstream side
Data Source
AI summary
A controller serving as determination device determines whether or not a rising speed of the clutch pressure of the input clutch is less than a limit rising speed of the original pressure. A controller serving as original pressure control device adjusts the original pressure such that a difference between the original pressure and the detected clutch pressure of the input clutch becomes a predetermined offset pressure when it is determined that the clutch pressure rising speed of the input clutch is less than the original pressure limit rising speed, and adjusts the original pressure such that the original pressure is raised at the original pressure limit rising speed when it is determined that the clutch pressure rising speed of the input clutch is equal to or higher than the original pressure limit rising speed.