Friction Clutch Chatter Vibration Reduction via Phase-Selective Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for reducing chatter vibrations in friction clutches of motor vehicle drivetrains, controlled by a clutch actuator, are inadequate as they struggle with frequency and amplitude variations, leading to discomfort and increased wear, especially when phase jumps or changing frequencies occur.
Innovation Solution
A method that uses a lock-in regulator to detect the absolute amplitude and phase of the input signal from the friction clutch, determining a phase-selective correction torque, which is then weighted by an intensification factor to adapt to the disturbance torque, and applied to the target clutch torque, incorporating a software damper and parameterizable components to manage frequency response and operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a phase-selective correction torque is applied to eliminate chatter vibrations, then vibration reduction is achieved, but the system becomes sensitive to frequency and amplitude variations causing tracking difficulties
Solution Approach 1:
The patent applies dynamics by making the correction torque adaptive to changing operating conditions. The system continuously adjusts the correction torque based on real-time detection of frequency and amplitude variations, allowing the control parameters to dynamically track changing vibration characteristics rather than relying on fixed parameters
Solution Approach 2:
The patent changes parameters by modifying the correction torque characteristics (amplitude and phase) in response to detected vibration variations. The system alters the correction torque parameters dynamically to maintain effectiveness across different operating conditions, including changes in frequency and amplitude
2Object-affected harmful factors
If filter parameters are adjusted to optimize damping for a specific excitation frequency, then that frequency is reduced, but other excitation frequencies are intensified
Solution Approach 1:
The patent applies local quality by targeting specific frequency components with phase-selective correction torque while leaving other frequency components unaffected. The correction is localized to the detected chatter vibration frequency rather than applying broad-spectrum damping, thus avoiding amplification of other frequencies
3Measurement precision
If a lock-in regulator is used to detect absolute amplitude and phase, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement systems with a lock-in regulator that uses signal processing to detect amplitude and phase. This substitution of measurement methodology achieves high precision through computational techniques rather than complex physical measurement apparatus
4Object-affected harmful factors
If correction torque is applied to eliminate vibrations, then comfort is improved, but wear increases due to disrupted clutch engagement
Solution Approach 1:
The patent changes parameters by dynamically adjusting the correction torque magnitude and phase to minimize vibrations while maintaining smooth clutch engagement. The system optimizes the correction parameters to reduce wear by avoiding abrupt torque changes that would disrupt engagement, thereby reducing mechanical wear on clutch components
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 by selectively compensating for identified amplitudes and frequencies, ensuring stable operation and minimizing wear, while adapting to varying conditions and external interventions.
Implementation Method 1
a lock-in regulator to detect the absolute amplitude and phase of input signals from the friction clutch
Implementation Method 2
applying a phase-selective correction torque weighted by an intensification factor to adapt to vibration-marked input signals
Data Source
AI summary
A method is disclosed for reducing chatter vibrations of a friction clutch controlled automatically by a clutch actuator on the basis of a target clutch torque (M(s)) assigned to a clutch torque which is to be transmitted. The friction clutch is positioned in a drivetrain between an internal combustion engine and a transmission, having a present actual clutch torque which is marked by vibrations as a result of vibrations (M(i)). From a transmission behavior of the present actual clutch torque (M(i)), an absolute amplitude and a phase of an input signal detected at the output of the friction clutch and conveyed to a regulator are ascertained, and a phase-selective disturbance torque is ascertained. From the phase-selective disturbance torque, a phase-correct correction torque (M(k)) is determined, and the target clutch torque (M(s)) is corrected by the regulator. The correction torque (M(k)) is weighted with a specifiable intensification factor.