Vibration Controller Switching Map and Adaptive Control
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Solution Overview
Problem
Existing vibration control methods for active vibration insulators face challenges in effectively managing vibrations across a wide range of frequencies, particularly at low frequencies (around 50 Hz) where ride quality is impaired and at high frequencies (above 50 Hz) where resonance can lead to unstable control signals, and map control methods struggle with the complexity of various driving conditions.
Innovation Solution
A vibration controller that switches between a map controller and an adaptive controller based on the frequency of cyclically pulsating signals, using a set-up frequency judging-and-switching mechanism to select the appropriate control method, allowing for quick control responses and adequate handling of vibrations from idling to running conditions, and addressing resonance issues by switching from adaptive to map control when frequencies approach resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an adaptive control method is used to update filter coefficients sequentially, then the control system can adapt to different vibration types, but the control response is retarded and cannot effectively handle low-frequency vibrations around 50 Hz
Solution Approach 1:
The system dynamically switches between two control modes (map control and adaptive control) based on the vibration frequency. For low-frequency vibrations (≤50 Hz), map control is used for immediate response, while for high-frequency vibrations (>50 Hz), adaptive control is used for adaptability. This dynamic mode switching resolves the contradiction by applying the appropriate control strategy for each frequency range.
2Measurement precision
If an adaptive control method is used with sequential filter coefficient updates, then the system can compensate amplitude and phase of control signals, but the control signal phase becomes unstable at high frequencies above 50 Hz due to retarded control response
Solution Approach 1:
The control system dynamically selects the appropriate control mode based on frequency. Map control is applied for high-frequency vibrations where phase stability is critical, while adaptive control is used for low-frequency vibrations where amplitude and phase compensation is more effective. This prevents phase instability by avoiding adaptive control in the problematic high-frequency range.
3Speed
If a map control method is used to store optimum filter coefficients for every engine revolution, then the control response is improved, but the number of data maps is limited and cannot fully cope with various driving conditions
Solution Approach 1:
The system merges two control approaches: map control for immediate response and adaptive control for adaptability. By combining both methods and switching between them based on frequency, the system achieves both fast response (from map control) and the ability to handle various driving conditions (from adaptive control), resolving the contradiction between response speed and versatility.
4Productivity
If the control method is switched between map control and adaptive control based on frequency, then effective vibration control is achieved across wide frequency ranges, but the device complexity increases
Solution Approach 1:
The system uses dynamic mode switching based on a simple frequency threshold (50 Hz) to select between map control and adaptive control. This relatively simple switching mechanism enables effective vibration control across a wide frequency range without introducing excessive complexity, as the switching criterion is based on a clear frequency boundary rather than complex decision logic.
Data Source
AI summary
A vibration controller includes a map controller, an adaptive controller, a set-up frequency judge/switcher, and an actuator. The map controller includes a data map storage for storing data on control signals determined in advance for a vibration insulator, and a signal generator for selecting one of the data, depending on a frequency of a cyclically pulsating signal emitted from a vibration generating source of a vehicle, from the data map storage and generating a control signal. The adaptive controller generates the control signal with respect to the cyclically pulsating signal using an adaptive control method. The set-up frequency judge/switcher switches from the map controller to the adaptive controller or vice versa based on the frequency of the cyclically pulsating signal. The actuator actuates an actuator of the vibration insulator based on the control signal generated by the map controller or the adaptive controller, whereby inhibiting the vehicle from vibrating.