Transmission Gear Control Based on Clutch Fluid Flowability
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Solution Overview
Problem
All-terrain vehicles experience a creep phenomenon due to the transmission of driving power through lubricating oil in hydraulic multiple disc clutches, causing unintended movement when the driver does not intend to accelerate.
Innovation Solution
A vehicle configuration that includes a processing circuitry-controlled interrupter with a speed change actuator and transmission, which determines flowability of the fluid and adjusts the gear stage based on power interruption conditions to prevent creep by setting the transmission to a gear stage with a lower reduction ratio when flowability is low, and to a higher gear stage when flowability is sufficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hydraulic multiple disc clutch is used to establish or cut power transmitting route, then the clutch can transmit power smoothly through lubricating oil, but the vehicle experiences creep phenomenon causing unintended movement
Solution Approach 1:
The control circuitry changes the gear stage parameter based on fluid flowability conditions. When creep is detected (low flowability), the transmission is switched to a gear stage with lower reduction ratio to reduce torque output and prevent unintended movement. This parameter change resolves the contradiction by maintaining smooth power transmission while eliminating the harmful creep effect.
Solution Approach 2:
The system uses flowability information as feedback to determine whether creep conditions exist. The control circuitry continuously monitors fluid flowability and adjusts the gear stage accordingly, creating a closed-loop control system that prevents creep phenomenon while maintaining smooth operation when conditions are normal.
2Force
If the transmission is set to a gear stage with higher reduction ratio to increase torque, then starting force is improved, but the creep phenomenon is exacerbated when fluid flowability is low
Solution Approach 1:
The gear stage is made dynamic and adjustable based on real-time fluid flowability conditions. The system automatically switches between different gear stages (with different reduction ratios) depending on whether creep conditions are present. This dynamic adjustment allows the system to optimize starting force when needed while preventing creep when fluid flowability is low.
3Object-generated harmful factors
If the gear stage is adjusted based on flowability information, then creep phenomenon is prevented, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The control circuitry performs multiple functions: it monitors fluid flowability, determines creep conditions, and adjusts gear stage selection. By making the control system multi-functional, the patent avoids adding separate dedicated components for each function, thereby limiting the increase in device complexity while still effectively preventing creep phenomenon.
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
Effectively prevents the creep phenomenon by reducing torque output to the driving wheel when flowability is low, ensuring the vehicle does not start traveling unintentionally, while allowing smooth starting when flowability is adequate.
Implementation Method 1
an interrupter that includes a first connector connected to the driving source, a second connector connected to the transmission, and a fluid in a gap between the first connector and the second connector, and establishes or interrupts a power transmitting route through which the driving power is transmitted from the first connector to the second connector
Implementation Method 2
Lubricating oil is in a hydraulic multiple disc clutch. The vehicle may cause a creep phenomenon in which the clutch transmits power by the lubricating oil as a medium, and this moves the vehicle.
Data Source
AI summary
A vehicle includes: an interrupter including a first connector connected to a driving source, a second connector connected to a transmission, and a fluid in a gap between the first and second connectors; and processing circuitry. The processing circuitry receives flowability information indicating a value related to flowability of the fluid. The processing circuitry determines whether or not a predetermined power interruption condition is satisfied. When the above condition is satisfied, and the processing circuitry determines that the value is less than a predetermined reference value, the processing circuitry controls the speed change actuator to set the transmission to a first gear stage. When the condition is satisfied, and the processing circuitry determines that the value is not less than the reference value, the processing circuitry controls the speed change actuator to set the transmission to a second gear stage having a lower reduction ratio than the first gear stage.