Clutch Control System Engagement Position Learning
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Solution Overview
Problem
In hybrid vehicles, the existing clutch control systems face challenges with reduced control response and unintended torque transmission due to friction surface wear and plane deflection of the clutch disc, leading to inefficiencies in engaging and releasing torque.
Innovation Solution
A control system for the clutch that includes an electronic control unit learning the engagement start position based on the rotational speed of the engaging elements, allowing for precise adjustment to prevent unintended contact and improve control response, even when plane deflection occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the clearance between the pressure plate and the clutch disc in the fully released state is reduced, then the control response is improved, but unintended transmission of torque may occur due to plane deflection of the clutch disc
Solution Approach 1:
The control unit performs preliminary learning of the engagement start position at predetermined timing (when the clutch is in a fully released state). This learned position is stored and used for subsequent control operations, allowing the system to anticipate and compensate for plane deflection effects before they cause unintended torque transmission.
Solution Approach 2:
The control unit detects the actual engagement start position through learning mechanisms and uses this feedback information to adjust the control target position. By comparing the learned engagement start position with the commanded position, the system can compensate for plane deflection and prevent unintended torque transmission while maintaining fast response.
2Reliability
If the clearance between the pressure plate and the clutch disc in the fully released state is increased, then unintended transmission of torque is prevented, but the control response is reduced
Solution Approach 1:
The system dynamically adjusts the control target position based on the learned engagement start position. Rather than using a fixed clearance value, the control unit calculates the appropriate control target position by adding a predetermined value to the learned engagement start position, allowing optimal clearance to be maintained dynamically despite plane deflection variations.
3Duration of action of moving object
If friction surfaces are worn, then the position of the pressure plate changes, but clutch controllability is reduced
Solution Approach 1:
The control unit continuously learns the engagement start position even after friction surface wear occurs. By detecting changes in the engagement start position due to wear and updating the stored position, the system maintains accurate clutch controllability throughout the service life of the friction surfaces.
Solution Approach 2:
The system adapts to wear by changing the control parameter (engagement start position) based on learned values. As friction surfaces wear and the physical engagement position changes, the control unit updates its reference position accordingly, maintaining optimal control performance despite the physical degradation of components.
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
This approach enhances control response and prevents unintended torque transmission by learning and adjusting the engagement start position according to rotational speed, effectively managing plane deflection and wear-related changes.
Implementation Method 1
a piston configured to move the first engaging element in the axial direction by a hydraulic pressure
Implementation Method 2
a diaphragm spring that applies spring force to the pressure plate
Implementation Method 3
friction surfaces of the clutch disc and the pressure plate or the flywheel become inevitably worn
Data Source
AI summary
A control system is for a clutch mechanism. The clutch mechanism includes a first engaging element, a second engaging element, and a piston. The first engaging element is configured to be moved according to change of a position of the piston. The first engaging element and the second engaging element are coupled to each other such that torque can be transmitted from the first engaging element to the second engaging element. The control system comprises an electronic control unit. The electronic control unit is configured to learn an engagement start position, according to a rotational speed of one of the first engaging element and the second engaging element. The engagement start position is a position of the first engaging element at the time when the first engaging element and the second engaging element start contacting with each other.