Vehicle Vibration Damping Preview Control With Speed-Based Filtering
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Solution Overview
Problem
The existing vibration damping control apparatus for vehicles is inefficient when the vehicle speed differs from the speed at which road surface displacement data was collected, leading to unnecessary energy consumption as it attempts to suppress vibrations outside the relevant frequency band, causing excess energy expenditure and potential increased vibrations in the sprung portion.
Innovation Solution
A vibration damping control apparatus that includes a speed obtainment section, a control force generating apparatus, and a control unit configured to adjust the processing of road surface displacement data based on the vehicle's current speed, applying low-pass or high-pass filters to reduce or remove high or low-frequency components not relevant to the current speed, thereby optimizing control force generation and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the vibration damping control apparatus uses road surface displacement data collected at a different speed without filtering, then the control system can operate continuously, but excessive energy is consumed by actuators attempting to suppress vibrations outside the relevant frequency band
Solution Approach 1:
The control apparatus applies frequency filtering to the road surface displacement data before using it for control calculations. This preliminary processing removes frequency components that will not be relevant at the current vehicle speed, preventing the actuators from wasting energy attempting to suppress irrelevant vibrations while maintaining effectiveness for relevant frequency bands
Solution Approach 2:
The system dynamically adjusts the filtering parameters (cutoff frequencies) based on the current vehicle speed. By changing the frequency band parameters according to speed, the control apparatus ensures that only vibrations within the relevant frequency range are suppressed, optimizing both energy consumption and control effectiveness
2Use of energy by moving object
If the control apparatus applies frequency filtering to road surface displacement data, then energy consumption is reduced, but the processing complexity increases
Solution Approach 1:
The frequency filtering is performed as a preliminary step before the main control calculations, preparing the road surface displacement data in advance. This approach organizes the processing workflow efficiently, reducing the computational burden during real-time control operations while maintaining energy savings
3Device complexity
If the control apparatus uses unfiltered road surface displacement data, then the control process is simpler, but vibrations in the sprung portion may increase due to unnecessary actuator activation
Solution Approach 1:
The control apparatus adjusts the frequency band parameters of the road surface displacement data according to the current vehicle speed. By matching the frequency range to the actual operating conditions, the system prevents unnecessary actuator activation that would generate harmful vibrations, while keeping the control process relatively simple through parameter adjustment rather than complex structural changes
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 ensures that the control apparatus executes preview vibration damping control effectively while minimizing energy consumption by tailoring the processing of road surface displacement data to the vehicle's current speed, reducing unnecessary energy use and maintaining effective vibration suppression.
Implementation Method 1
the control unit executes a first process on the first data in the case where the speed of the vehicle at the present point in time is higher than a speed represented by speed information, the first process being a low-pass filter process for reducing or removing components within a frequency band higher than a first cutoff frequency
Implementation Method 2
the control unit executes a second process on the first data in the case where the speed of the vehicle at the present point in time is lower than the speed represented by the speed information, the second process being a high-pass filter process for reducing or removing components within a frequency band lower than a second cutoff frequency
Data Source
AI summary
A vibration damping control apparatus of a vehicle obtains first data from a road surface information in which position information, a road surface displacement related value, and speed information are rerated to one another. The first data represents a time series change of the road surface displacement related value on a predicted route of a wheel. The vibration damping control apparatus obtains speed information at a predicted passage position from the road surface information. In the case where the speed of the vehicle at the present point in time is higher than a speed represented by the speed information, the vibration damping control apparatus executes a first process (low-pass filter process) on the first data, obtains preview information from the first data having been subjected to the first process, and controls a control force generating apparatus on the basis of a target control force computed by using the preview information.