Active Vibration Damping Device Phase Control for Engine Mounts
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Solution Overview
Problem
Temperature changes affect the spring constant and control characteristics of active vibration damping devices, limiting their driving force, especially when drive voltage or current is constrained.
Innovation Solution
An active vibration damping device with first and second engine mounts, using a vibration control unit that estimates engine vibrations based on rotation information to adjust amplitudes and phases of active vibrations generated by actuators, allowing for increased composite vibration and sufficient driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the drive voltage or drive current of the ACM is increased to increase the driving force, then the driving force increases, but the upper limit of the driving force decreases when a limit is placed on the magnitude of the drive voltage or drive current
Solution Approach 1:
The control method dynamically adjusts the phase relationship between multiple ACMs based on real-time vibration conditions. By changing phases in opposite directions when vibration exceeds thresholds, the system optimizes the composite vibration output without requiring increased drive voltage or current magnitude, thus maintaining driving force within safe limits while maximizing effectiveness.
Solution Approach 2:
The invention combines the output of multiple ACMs (first and second actuators) to create a composite vibration effect. By coordinating the phases and amplitudes of multiple actuators, the system achieves greater overall driving force than any single actuator could produce alone, while each individual actuator operates within its safe voltage and current limits.
2Temperature
If the ACM operates at elevated temperature, then the spring constant of the engine mount changes, but the driving force of the ACM decreases more so than at normal temperature
Solution Approach 1:
The control method continuously monitors vibration values and compares them against predetermined thresholds. Based on this feedback, the system automatically adjusts the phase relationships between multiple ACMs to optimize their composite output. This closed-loop control compensates for temperature-induced changes in spring constant and actuator characteristics, maintaining effective driving force across varying temperature conditions.
Solution Approach 2:
The system changes the phase parameters of the ACMs dynamically based on operating conditions. By adjusting phase relationships rather than relying solely on amplitude increases, the system adapts to temperature variations and maintains optimal performance without being constrained by temperature-dependent limitations on drive voltage or current magnitude.
3Force
If multiple ACMs are used to generate composite vibration, then the driving force increases, but the control complexity increases
Solution Approach 1:
The control method segments the vibration control function across multiple independent ACMs, each operating with controlled phase relationships. This segmentation allows the system to achieve complex composite vibration patterns through coordinated simple individual actuator operations, managing overall system complexity while maximizing driving force output.
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 solution enables the generation of a sufficient driving force by actively controlling vibrations, even under temperature changes and voltage/current constraints, effectively suppressing vibrations between the engine and vehicle body.
Implementation Method 1
suppress vibrations transmitted from a side of the internal combustion engine to a side of the vehicle body, by active vibrations generated by actuators of the engine mount
Implementation Method 2
a vibration estimating unit adapted to estimate a vibration value of the internal combustion engine on the basis of the rotation information of the internal combustion engine
Data Source
AI summary
Normally, a phase fixed control is executed. In the event that a vibration value VAPP of an engine becomes greater than or equal to a predetermined vibration value VAPP_th, a first phase of an active vibration generated by a first actuator and a second phase of an active vibration generated by a second actuator are changed in mutually opposite directions.