Wet Clutch Touch Point Learning via Hydraulic Pressure Analysis
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Solution Overview
Problem
Existing technologies lack an efficient method for learning the touch point of a wet clutch, making it difficult to control clutch engagement and inhibit shifting shock.
Innovation Solution
A touch point learning apparatus and method that utilizes a hydraulic pressure chamber, a piston, and a controller to determine engagement and disengagement of the clutch based on hydraulic pressure changes, identifying sections such as stop, transfer, and engagement sections to accurately learn the touch point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional touch point learning methods are used for wet clutch, then the clutch engagement control can be achieved, but the learning process becomes difficult and complex
Solution Approach 1:
The patent replaces complex mechanical sensing methods with hydraulic pressure sensing. By using a hydraulic pressure sensor to detect pressure changes in the hydraulic system during clutch engagement, the touch point can be learned through electrical signal processing rather than mechanical measurement, simplifying the overall system while improving ease of learning.
Solution Approach 2:
The system performs self-learning of the touch point by automatically detecting hydraulic pressure changes during normal operation. The controller autonomously identifies the touch point by monitoring when the hydraulic pressure change rate exceeds a threshold, eliminating the need for manual calibration or complex external learning apparatus.
2Speed
If hydraulic pressure is applied rapidly to engage clutch plate and clutch disc, then engagement speed is improved, but shifting shock increases
Solution Approach 1:
The patent dynamically adjusts the hydraulic pressure application rate based on the learned touch point information. During engagement, the system applies hydraulic pressure rapidly when away from the touch point for fast engagement, then automatically reduces the pressure increase rate when approaching the touch point to prevent shifting shock, achieving both speed and smoothness.
Solution Approach 2:
The system uses feedback from the hydraulic pressure sensor to monitor the engagement process in real-time. When the pressure change rate indicates proximity to the touch point, the controller adjusts the hydraulic pressure application accordingly, creating a closed-loop control system that balances engagement speed with shock prevention.
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
Enables easy learning of the clutch touch point, achieving rapid and smooth gear shifts by adjusting the application of hydraulic pressure based on actual hydraulic pressure changes and wear conditions, thereby improving clutch control.
Implementation Method 1
a hydraulic pressure chamber to which a working hydraulic pressure is applied, wherein the working hydraulic pressure is capable of engaging or disengaging the clutch plate and the clutch disc
Implementation Method 2
a return spring configured to transfer the piston in a direction away from the clutch plate by elastically pressing the piston
Data Source
AI summary
The present disclosure provides a touch point learning apparatus for a clutch including: a clutch plate connected to an input shaft; a clutch disc connected to an output shaft; a hydraulic pressure chamber to which a working hydraulic pressure is applied, wherein the working hydraulic pressure is capable of engaging or disengaging the clutch plate and the clutch disc; and a controller configured to determine the engaging or disengaging of the clutch plate and the clutch disc based on a change in the working hydraulic pressure.