Clutch Actuator Pressure Equilibrium for Consistent AMT Shifting
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Solution Overview
Problem
Automated manual transmissions face challenges in maintaining consistent clutch operation due to pressure equilibrium issues, leading to variations in clutch actuator stroke and potential shift feel disconnection.
Innovation Solution
A method for controlling the clutch actuator in automated manual transmissions, where a controller collects driving information, determines the actual stroke position, and outputs target signals to maintain pressure equilibrium with atmospheric pressure, ensuring uniform operation by adjusting the clutch actuator's stroke position and speed based on sensor feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clutch actuator operates without pressure equilibrium control, then the response speed is fast, but the shift feel becomes disconnected and inconsistent
Solution Approach 1:
The system performs preliminary pressure equilibrium control by detecting when the clutch actuator stroke position is within a predetermined range before the main clutch operation. The controller extends the clutch operation time to allow hydraulic pressure to reach equilibrium with atmospheric pressure before the actual clutch engagement, ensuring consistent shift feel while maintaining reliable operation.
Solution Approach 2:
The system uses feedback control by continuously monitoring the clutch actuator stroke position through sensors and comparing it with target positions. The controller adjusts the clutch operation duration based on feedback about whether pressure equilibrium has been achieved, ensuring consistent shift feel across multiple operations while adapting to varying conditions.
2Reliability
If the clutch operation time is extended for pressure equilibrium, then the shift feel improves, but the productivity decreases
Solution Approach 1:
The system applies partial pressure equilibrium control by extending the clutch operation time only when the stroke position is within the predetermined range indicating pressure imbalance. For normal operations where equilibrium is already maintained, the system uses standard operation times, thus improving consistency without significantly impacting overall productivity.
Solution Approach 2:
The controller dynamically changes the clutch operation time parameter based on detected stroke position and pressure equilibrium conditions. When pressure equilibrium is achieved, normal operation times are used; when imbalance is detected, the operation time is extended, allowing the system to adapt productivity and consistency requirements in real-time.
3Manufacturing precision
If the clutch actuator stroke position is not precisely controlled, then the device complexity is reduced, but the manufacturing precision of clutch operation deteriorates
Solution Approach 1:
The system replaces complex mechanical position control mechanisms with electronic sensing and control. Sensors detect the clutch actuator stroke position, and the controller electronically adjusts the operation duration to achieve precise positioning, reducing mechanical complexity while improving stroke position accuracy and shift consistency.
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 ensures consistent and uniform clutch operation, improving shift feel and responsiveness by maintaining hydraulic pressure equilibrium, thereby enhancing driver convenience and power delivery efficiency.
Implementation Method 1
the cylinder body is formed with an orifice hole connecting the hydraulic chamber and a reservoir tank such that the hydraulic pressure of the hydraulic chamber may form pressure equilibrium with an atmospheric pressure
Data Source
AI summary
In a method for controlling a clutch actuator for an automated manual transmission, when a driver's operation signal is input for operation of the clutch actuator, the hydraulic pressure of a hydraulic chamber of the clutch actuator forms pressure equilibrium with the atmospheric pressure through a pressure equilibrium control by standing by at a control-standby state before an actual stroke position of the clutch actuator enters a hydraulic pressure generation range from a hydraulic pressure release range. When the actual stroke position of the clutch actuator enters the hydraulic pressure generation range from the hydraulic pressure release range, the clutch actuator is moved to the predetermined stroke position by a predetermined operation speed, and then controlled to follow the driver's operation signal.