Hydrodynamic Launch Coupling With Active Damping for Resonance Control
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Solution Overview
Problem
Conventional dynamic absorbers in launch devices can worsen noise and vibration (NV) performance in specific frequency ranges due to resonance issues, affecting the smooth operation of automatic transmissions.
Innovation Solution
An active dynamic damper (ADD) system is integrated into the launch device, featuring an ADD clutch and piston that moves between open and closed positions, coupled with a reaction plate and pressure chamber to adjust fluid pressure and mitigate resonance influence on the main damper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional dynamic absorber is used in the launch device, then the noise and vibration performance deteriorates in specific frequency ranges, but the device structure remains simple
Solution Approach 1:
The patent applies the Dynamics principle by implementing an active dynamic damper system that can dynamically adjust its characteristics based on operating conditions. The ADD system includes a piston that can move between open and closed positions, and a clutch that can engage and disengage, allowing the damper to adapt its resonance frequency and damping characteristics to different engine speeds and load conditions, thereby reducing NV in specific frequency ranges without requiring a completely complex fixed structure
Solution Approach 2:
The patent applies the Parameter changes principle by modifying the resonance frequency and damping characteristics of the dynamic damper through active control. The system changes parameters such as fluid pressure in the pressure chamber, piston position, and clutch engagement state to adjust the damper's natural frequency and damping coefficient, enabling it to effectively counteract resonance sideband peaks that occur at different operating conditions
2Object-affected harmful factors
If the main damper operates outside its natural frequency range, then resonance sideband peaks increase, but the device operates simpler without additional control systems
Solution Approach 1:
The patent applies the Feedback principle by implementing a control system that monitors the operating conditions of the launch device and adjusts the ADD system accordingly. The system uses feedback from the operational state (engine speed, load conditions) to control the piston position and clutch engagement, ensuring the main damper operates within its optimal frequency range and resonance sideband peaks are minimized
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
The ADD system effectively reduces resonance sideband peaks, enhancing the operational stability and reducing NV across various engine speeds, allowing the main damper to function optimally within its natural frequency range.
Implementation Method 1
During rotation of the impeller, hydraulic fluid is centrifugally forced radially outward, then forward (to the left in FIG. 1) to impact against blades of a turbine
Implementation Method 2
Conventional dynamic absorbers have the possibility of worsening the NV performance of the vehicle in specific frequency ranges because of the resonance specific to the dynamic absorber
Implementation Method 3
a main damper coupled between the turbine and the output hub of the launch device... an active dynamic damper (ADD) system coupled to the main damper and configured to reduce resonance influence on the main damper
Data Source
AI summary
A launch device coupling a prime mover to a transmission. The launch device includes a front cover for connecting to the output of the prime mover and an output hub for connecting to the input of the transmission. A rear cover is connected to the front cover and cooperates to define a chamber. Within the chamber are an impeller and a turbine having a plurality of opposing blades such that hydraulic fluid is directed from the impeller blades and toward the turbine blades. A main damper is provided between the turbine and output hub of the launch device. Coupled to the main damper is a lock-out clutch configured to releasably lock the main damper for rotation with one of the front and rear covers. The launch device also includes an active dynamic damper system coupled to the main damper and configured to reduce resonance influence on the main damper.