Clutch Actuator Control for Accurate Stroke Learning
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Solution Overview
Problem
Existing control systems for actuators that supply hydraulic pressure to slave cylinders to disengage and engage clutches face errors in learning the operation amount at the start of clutch engagement due to gaps between the piston and seal, especially under negative pressure conditions, leading to inaccurate clutch engagement.
Innovation Solution
A control apparatus and method that includes a first piston and a second piston, where the second piston forms part of the oil chamber and is slid to move the first piston, with repeated disengagement and engagement cycles to ensure positive pressure and contact between the pistons, allowing accurate learning of the operation amount at clutch engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the piston and seal are formed separately in the slave cylinder, then the manufacturing and assembly are simplified, but a gap is formed between the piston and seal under negative pressure, causing errors in learning the operation amount at clutch engagement
Solution Approach 1:
The control apparatus performs preliminary actions by repeatedly disengaging and engaging the clutch before learning the operation amount. This preliminary operation ensures that the piston and seal are in proper contact, eliminating gaps caused by negative pressure, and establishes accurate initial conditions for subsequent measurement and learning operations.
2Loss of time
If the operation amount is learned immediately without preliminary operations, then the learning process is faster, but errors occur due to gaps between the piston and seal
Solution Approach 1:
The control apparatus performs preliminary actions by repeatedly disengaging and engaging the clutch before learning the operation amount. This preliminary operation ensures that the piston and seal are in proper contact, eliminating gaps caused by negative pressure, and establishes accurate initial conditions for subsequent measurement and learning operations.
Solution Approach 2:
The control apparatus employs periodic action by repeatedly disengaging and engaging the clutch a predetermined number of times before learning the operation amount. This periodic operation cycles the hydraulic system to ensure positive pressure and proper contact between components, thereby eliminating measurement errors while maintaining efficient learning timing.
3Measurement precision
If the clutch is repeatedly disengaged and engaged before learning, then the operation amount is learned accurately, but the control process takes more time
Solution Approach 1:
The control apparatus employs periodic action by repeatedly disengaging and engaging the clutch a predetermined number of times before learning the operation amount. This periodic operation cycles the hydraulic system to ensure positive pressure and proper contact between components, thereby eliminating measurement errors while maintaining efficient learning timing.
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 effectively reduces errors in learning the operation amount at clutch engagement by ensuring the pistons contact each other, enabling accurate detection and control of the clutch actuator's operation amount.
Implementation Method 1
an actuator that supplies a hydraulic pressure to a slave cylinder in which a first piston and a second piston are provided
Data Source
Figure 1
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AI summary
An ECU executes a program that includes a step (S102) of controlling a clutch actuator that supplies a hydraulic pressure to a slave cylinder so that the clutch is repeatedly disengaged and engaged; and a step (S104) of performing initial learning of a stroke of the clutch actuator, after controlling the clutch actuator so that the clutch is repeatedly disengaged and engaged.