Friction Clutch Chatter Vibration Damping via Phase Offset Torque
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Solution Overview
Problem
Existing methods for reducing chatter vibrations in motor vehicle drivetrains with automated friction clutches are not robust enough to handle multiple frequency components and phase jumps, and they do not simplify activation during amplitude or frequency changes, leading to inefficiencies in damping and predictability.
Innovation Solution
A method that emulates a vibration absorber by appropriately operating the friction clutch to apply torque moments at a phase offset, using a transfer function with adjustable phase shift and filtering to suppress low-frequency components, allowing for adaptive damping and amplification based on operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods for reducing chatter vibrations are used, then some damping effect is achieved, but the system lacks robustness when handling multiple frequency components and phase jumps
Solution Approach 1:
The patent implements a dynamic control system that continuously adapts the clutch actuation parameters based on real-time vibration frequency detection. The control method dynamically adjusts the phase shift and frequency modulation of the clutch actuation signal to match the detected chatter vibration characteristics, enabling the system to handle multiple frequency components and phase jumps effectively while maintaining robustness across varying operating conditions.
Solution Approach 2:
The patent changes key operational parameters including the phase shift between clutch actuation and vibration frequency, the frequency modulation depth, and the actuation timing. By dynamically adjusting these parameters based on detected vibration characteristics, the system achieves robust damping performance across multiple frequency components and phase conditions without requiring a mechanical vibration absorber.
2Reliability
If complex control methods are used to handle multiple frequency components, then damping effectiveness may improve, but the system becomes less predictable and harder to verify
Solution Approach 1:
The patent implements a feedback control system where vibration sensors continuously monitor the drivetrain for chatter vibrations, and the control unit adjusts the clutch actuation parameters based on this feedback. The system detects vibration frequency and amplitude, then modulates the clutch actuation signal accordingly to achieve active damping. This closed-loop approach maintains predictability while effectively handling multiple frequency components.
3Object-affected harmful factors
If a mechanical vibration absorber is used, then vibration damping is achieved, but production and maintenance costs increase
Solution Approach 1:
The patent replaces the mechanical vibration absorber with an electronic control system that uses the automated clutch actuation mechanism to achieve vibration damping. Instead of adding a separate mechanical device, the system uses electronic sensors and a control unit to modulate the clutch actuation signal, thereby substituting mechanical damping with an electronically controlled active damping system that reduces production and maintenance costs.
Solution Approach 2:
The patent enables the existing clutch actuation system to serve dual functions: both clutch engagement/disengagement and vibration damping. By utilizing the already-present actuators and control mechanisms in the automated clutch system, the invention eliminates the need for separate vibration damping components, thereby reducing production and maintenance costs while achieving effective chatter vibration reduction.
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 chatter vibrations, improves driving comfort, reduces production and maintenance costs, and enhances controllability by providing robust and predictable operation across various conditions without the need for a mechanical vibration absorber.
Implementation Method 1
emulating a vibration absorber by an appropriate operation of the friction clutch
Implementation Method 2
emulating a vibration absorber by an appropriate operation of the friction clutch
Data Source
AI summary
A method is provided for reducing chatter vibrations in a motor vehicle drivetrain having a drive unit, a vehicle transmission and an automated friction clutch, wherein a vibration absorber is emulated by an appropriate operation of the friction clutch in order to improve the method.