Clutch Control Device Dynamic Feedback Switching
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Solution Overview
Problem
Existing clutch control systems face issues with responsiveness and accuracy during clutch disconnection and reconnection, particularly due to delays and pressure losses in the hydraulic path, which affect the connection performance and user experience.
Innovation Solution
A clutch control device that includes an engine, gearbox, clutch actuator, controller, and sensors, which performs feedback control using PID terms and adjusts control parameters based on clutch operation speed and hydraulic pressure, switching between I and P terms to optimize clutch engagement and disengagement, and varies the control state change determination value to account for oil path pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is executed using the same method before and after clutch connection, then control consistency is maintained, but clutch connection delay increases and responsiveness deteriorates
Solution Approach 1:
The patent applies dynamics by switching the feedback control method based on the clutch connection state. Before clutch connection, PID control is used; after connection, when the control parameter reaches the determination value, the control method changes to prioritize responsiveness. This dynamic adaptation resolves the contradiction between control consistency and connection speed.
Solution Approach 2:
The patent changes control parameters dynamically - specifically switching between different feedback control strategies (PID vs. alternative control) based on whether the control parameter has reached the determination value. This parameter change enables the system to achieve both consistency during approach and responsiveness upon connection.
2Reliability
If friction in hydraulic path is present, then realistic control is achieved, but pressure loss occurs and connection performance deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-setting the control state change determination value to account for expected friction and pressure loss in the hydraulic path. This allows the control system to compensate for energy loss before it significantly impacts connection performance, maintaining both realistic control accuracy and connection speed.
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 solution improves clutch connection performance by quickening convergence and reducing overshoot, enhances responsiveness, and allows for accurate control of clutch capacity even with hydraulic pressure delays, ensuring stable and timely disconnection and connection operations.
Implementation Method 1
a control parameter sensor that detects a control parameter of the clutch capacity
Implementation Method 2
a clutch operation amount sensor that converts an operation amount of the clutch operator into an electrical signal
Implementation Method 3
the clutch capacity may be controlled by the hydraulic pressure, a master cylinder of the clutch actuator and a slave cylinder of the clutch device may be connected to each other via a hydraulic pressure pipeline
Implementation Method 4
it is also necessary to consider a case in which friction (a flow resistance or pressure loss in an oil passage) is present in a hydraulic path of a clutch operation system
Data Source
AI summary
A clutch control device includes an ECU that controls a clutch actuator, the ECU sets a control target value of the clutch capacity according to the operation amount detected by the clutch operation amount sensor, and executes feedback control so that the control parameter which is detected by the control parameter sensor approaches the control target value, and changes a method of the feedback control when the control parameter reaches a predetermined control state change determination value during the feedback control.