Vehicle Active Mount Control via Inverse Phase Signal
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Solution Overview
Problem
Existing active mounts for vehicles, such as those using magneto-rheological fluid and electric or electromagnetic actuators, can only decrease dynamic characteristics and are unable to increase them or selectively reduce specific vibration components, limiting their effectiveness in improving traveling performance.
Innovation Solution
A controller for an integrated active mount that applies a control signal with an inverse phase to the main excitation force of the engine, allowing for increased stiffness and improved traveling performance by adjusting the control current based on vehicle conditions, such as steering angle, acceleration, and engine RPM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing active mounts using magneto-rheological fluid or electric actuators are used, then dynamic characteristics can be decreased, but they cannot increase dynamic characteristics or selectively reduce specific vibration components
Solution Approach 1:
The patent implements a dynamic control system that adjusts the active mount's characteristics in real-time based on vehicle operating conditions. The controller receives signals about vehicle state (acceleration, steering angle, etc.) and dynamically changes the control current to the actuator, enabling the mount to adapt between reducing vibration and improving traveling performance as needed
Solution Approach 2:
The patent changes the control parameters of the active mount by adjusting the phase and magnitude of the control signal applied to the actuator. By varying these parameters based on detected vibration characteristics and vehicle conditions, the system can selectively target specific vibration frequencies and modes, enabling both vibration reduction and traveling performance improvement
2Productivity
If control signal with same phase as vibration is applied, then traveling performance is improved, but vibration transmission is increased
Solution Approach 1:
The patent employs periodic control actions by applying control signals that oscillate at the same frequency as the detected vibration. By periodically adjusting the phase and magnitude of these control signals based on continuous vibration monitoring, the system can alternately prioritize traveling performance improvement and vibration reduction depending on the instantaneous operating conditions
3Object-generated harmful factors
If control signal with inverse phase to vibration is applied, then vibration transmission is reduced, but traveling performance deteriorates
Solution Approach 1:
The patent implements a feedback control system that continuously monitors vibration characteristics and vehicle operating conditions, then adjusts the control signal phase and magnitude accordingly. The controller receives feedback about the current state and modifies the actuator control in real-time, enabling the system to transition between inverse-phase control (for vibration reduction) and same-phase control (for traveling performance improvement) based on actual conditions
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 enables the active mount to enhance traveling performance by increasing stiffness and reducing vibration transmission, effectively addressing the limitations of existing technologies without additional cost or configuration requirements.
Implementation Method 1
operates the actuator, using Lorenz force between a permanent magnet and a coil to which a current is applied
Implementation Method 2
the magnetized particles shows fluid behavior like common fluid (fluid in a common hydro-mount) by non-uniformly dispersing in the OFF-state, but the particles are arranged in the structure of a fiber and the properties are changed in the ON-state, that is, a magnetic field is applied (shear stress=viscosity×shear rate+yield shear stress)
Data Source
AI summary
A structure for controlling an integrated active mount of a vehicle improves driving performance of a vehicle, not reducing noise vibration, by providing a control signal with an inverse phase to the phase of the main excitation force of an engine in accordance with driving conditions through an active mount disposed between the engine and a vehicle body in order to reduce noise vibration of the vehicle.