Wet Clutch Engagement Control for Oil-Dependent Position Drift
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Solution Overview
Problem
Positioning inaccuracies occur in position-controlled clutch units due to time-dependent setting behavior of friction clutches, caused by varying lubrication oil uptake and axial compression, leading to changes in locking torque over time.
Innovation Solution
A method to regulate the engagement position of the clutch unit by compensating for the time-dependent setting behavior using a transmission element like a PT1 element, which models and adjusts the engagement position based on detected setting changes, considering factors like axial force, locking torque, and rotational speed, to maintain high positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the engagement position of the clutch unit is regulated without compensation for time-dependent setting behavior, then the device complexity is reduced, but positioning accuracy deteriorates over time due to varying lubrication oil uptake
Solution Approach 1:
The regulation method uses feedback by continuously monitoring the actual engagement position of the clutch unit and comparing it with the desired position. Based on this feedback, the actuator adjusts the engagement position in real-time to compensate for time-dependent setting behavior caused by varying lubrication oil uptake, thereby maintaining high positioning accuracy without requiring complex hardware modifications
Solution Approach 2:
The system compensates for positioning inaccuracies by dynamically changing the engagement position parameter over time. The regulation method accounts for the time-dependent setting behavior by adjusting the engagement position based on operational parameters such as lubrication oil uptake variations, allowing the system to adapt to changing conditions and maintain accuracy
2Measurement precision
If the engagement position is adjusted frequently to maintain accuracy, then positioning accuracy is improved, but the duration of stable operation is reduced
Solution Approach 1:
The regulation system transitions from a static engagement position to a dynamic one that adapts over time. By continuously adjusting the engagement position based on actual measurements and time-dependent setting behavior, the system maintains accuracy throughout the stable operation period rather than degrading over time
Solution Approach 2:
The system performs preliminary compensation by predicting and counteracting time-dependent setting behavior before significant positioning errors occur. The regulation method proactively adjusts the engagement position based on expected lubrication oil uptake variations, preventing accuracy degradation rather than merely correcting it
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 high positioning accuracy of the clutch unit by accounting for time-dependent setting behavior, reducing inaccuracies and maintaining consistent torque transmission, even during varying operating states and lubrication conditions.
Implementation Method 1
connect a rotating input element with at least one input disk, which is provided with a friction lining, and a rotating output element with at least one output disk, which is provided with a friction lining, to one another in a frictionally locking fashion, to be precise, in particular, in order to transmit a drive torque
Implementation Method 2
The friction clutch can therefore be embodied, in particular, as a wet-running multi-disk clutch with alternately arranged input disks and output disks as well as oil for cooling and lubricating the clutch unit
Implementation Method 3
an actuator for setting the engagement position for the purposes of mutual compression of the input and output elements
Data Source
AI summary
The present invention relates, inter alia, to a method for regulating the engagement position of a position-controlled clutch unit for a drive train of a motor vehicle. The clutch unit has at least one wet-running friction clutch for the controllable transmission of a torque from an input element to an output element and an actuator for setting the engagement position for the purposes of mutual compression of the input and output elements. The method compensates a time-dependent setting behavior of the friction clutch on the basis of the uptake of lubrication oil of the friction clutch, which varies over time, in that the engagement position of the clutch unit is regulated by means of the actuator as a function of the time-dependent setting behavior.