Clutch Valve Control for Faster Initial Piston Response
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Solution Overview
Problem
The existing clutch devices experience delays in initial operation due to hysteresis effects from spring members and insufficient fluid filling, leading to reduced responsiveness in disengagement and engagement switching processes.
Innovation Solution
A clutch control device that adjusts the urging force of an elastic member by controlling the piston movement within a clutch actuator, utilizing a valve control unit to manage the supply and discharge of working fluid through multiple valves, ensuring timely and efficient switching between disengagement and engagement states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring member with hysteresis characteristic is used in the clutch device, then the clutch device can maintain engagement state, but the initial operation of the piston is delayed due to hysteresis effect
Solution Approach 1:
The control device performs preliminary action by detecting the engagement state and proactively controlling the discharge valve to accelerate the discharge of working fluid before the hysteresis effect can delay the piston operation. This anticipatory control ensures the piston responds timely while maintaining reliable engagement state through the spring member.
2Device complexity
If the flow path of working fluid is not sufficiently filled during engagement state change, then the clutch device structure is simple, but the responsiveness is reduced due to fluid release delay
Solution Approach 1:
The control device employs feedback by detecting the engagement state of the clutch device and using this information to control the discharge valve. The detection unit monitors whether the clutch is in engagement or disengagement state, and the control unit adjusts the discharge valve operation accordingly to ensure timely fluid discharge and rapid piston response without complicating the flow path structure.
3Speed
If multiple valves are used to control working fluid pressure, then the responsiveness of clutch switching is improved, but the device complexity increases
Solution Approach 1:
The discharge valve is designed to perform multiple functions: it controls working fluid discharge during both engagement and disengagement state transitions, and its operation is unified under a single control logic based on engagement state detection. This multi-functionality approach improves clutch switching responsiveness while avoiding the complexity of entirely separate valve systems for different operating 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
Improves responsiveness by ensuring quick fluid supply and discharge during clutch switching processes, enhancing the initial operation completion and overall control responsiveness of the clutch device.
Implementation Method 1
a diaphragm spring is used in the clutch device described above, when the engagement of the clutch device in a disengagement state is changed from the disengaged state to an engagement state, the behavior of the diaphragm spring in an elastically deformed state may be affected by the hysteresis
Implementation Method 2
the behavior of the diaphragm spring in an elastically deformed state may be affected by the hysteresis
Implementation Method 3
the piston provided movably in the cylinder in accordance with pressure of a working fluid in the pressure chamber
Data Source
AI summary
This clutch control device is provided with: a first valve; a second valve; a valve control unit configured to control the operation of each of the first valve and the second valve; an operation determination unit configured to perform an operation determination for the clutch device; and an initial operation completion determination unit which determines whether an initial operation of the clutch device has been completed. The valve control unit, if it is determined by the operation determination unit that an on-off switching process is required, subjects both the first valve and the second valve to opening-control. If it is determined by the initial operation completion determination unit that the initial operation has been completed, the valve control unit subjects the second valve to closing-control.