Speed-Adaptive Damper for Vehicle Drive System Vibration Control
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Solution Overview
Problem
Existing drive systems with internal combustion engines face challenges in maintaining effective vibration reduction as the excitation order changes during operation, leading to varying performance modes, which affects the quality of vibration damping and efficiency.
Innovation Solution
The implementation of a speed-adaptive damper system that adjusts its natural frequency in response to changing rotational speeds and excitation orders, combined with a dual mass flywheel and specifically tuned mass dampers for critical orders, ensures consistent vibration reduction across different operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed-order vibration reducing systems are used, then the system structure is simple, but the vibration reduction quality deteriorates when excitation order changes during operation
Solution Approach 1:
The patent applies the dynamics principle by making the vibration reducing system adaptive to changing operating conditions. The control device dynamically adjusts the vibration reduction strategy based on detected excitation orders, transitioning between different damping configurations as the engine operates across varying load and speed conditions, thereby maintaining effective vibration reduction despite changing excitation characteristics
Solution Approach 2:
The patent implements parameter changes by modifying the natural frequency and damping characteristics of the vibration reducing system in response to changing excitation orders. The system adjusts its physical parameters (such as stiffness and damping coefficients) to match the dominant excitation order at any given operating point, ensuring optimal vibration reduction across the entire operating range
2Use of energy by moving object
If cylinders are switched off or operating modes are changed to improve fuel efficiency, then fuel consumption decreases, but the excitation order changes causing deterioration in vibration reduction quality
Solution Approach 1:
The patent implements feedback by using the control device to continuously detect the current excitation order based on engine operating conditions (load and rotational speed). This detected information feeds back to the vibration reducing system, which automatically adjusts its damping characteristics to match the current excitation order, ensuring that vibration reduction quality is maintained even when cylinders are switched off for fuel efficiency
Solution Approach 2:
The system dynamically adapts its vibration reduction strategy in response to operating mode changes. When cylinders are switched off to improve fuel efficiency, the control device detects the resulting change in excitation order and adjusts the vibration reducing system's parameters accordingly, maintaining effective vibration damping across different fuel efficiency operating modes
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 maintains high decoupling quality and efficiency by adapting to varying excitation orders, preventing resonance issues and ensuring effective vibration damping even when switching between different engine performance modes.
Implementation Method 1
The implementation of a speed-adaptive damper system that adjusts its natural frequency in response to changing rotational speeds and excitation orders
Implementation Method 2
dual mass flywheel and specifically tuned mass dampers for critical orders, ensures consistent vibration reduction across different operating modes
Implementation Method 3
preventing resonance issues and ensuring effective vibration damping
Data Source
AI summary
A drive system for a vehicle comprises an internal combustion engine and a torsional vibration damping arrangement. The internal combustion engine is switchable between operating modes of different performance capability, and the torsional vibration damping arrangement comprises a flywheel mass arrangement and at least one deflection mass pendulum unit with a deflection mass carrier and a deflection mass arrangement supported at the deflection mass carrier such that it can deflect out of a basic relative position with respect to the latter by means of a deflection mass coupling arrangement.