Vehicle Vibration Damping Preview Control for Speed-Matched Road Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing vibration damping control apparatuses for vehicles face issues when the vehicle speed changes, as they use road surface displacement data collected at different speeds, leading to ineffective suppression of vibrations in the frequency bands not corresponding to the current speed, resulting in increased or reduced vibration of 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, which determines a predicted passage position and uses preview reference data to obtain road surface displacement information suitable for the vehicle's speed, allowing for precise control force application to suppress vibrations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If road surface displacement data collected at different speeds is used for vibration damping control, then the control apparatus can operate at any speed, but the vibration suppression effectiveness deteriorates in frequency bands not corresponding to the current speed
Solution Approach 1:
The patent applies dynamics by making the control system adaptive to changing speed conditions. The control apparatus dynamically selects or adjusts control parameters based on the current vehicle speed, ensuring that the frequency band of the control force matches the frequency band of vibrations generated at that speed. This resolves the contradiction by enabling speed adaptability while maintaining vibration suppression effectiveness through dynamic parameter adjustment.
Solution Approach 2:
The patent changes control parameters (specifically the frequency band characteristics of the control force) according to the vehicle speed. By adjusting the control force frequency band to match the vibration frequency band corresponding to the current speed, the system maintains effective vibration suppression across different operating conditions while preserving speed adaptability.
2Ease of manufacture
If preview vibration damping control is executed using road surface displacement related value obtained at a different speed, then the control can be implemented with existing data, but the actuator drives uselessly in frequency bands not contained in the second frequency band
Solution Approach 1:
The system dynamically adjusts the control force frequency band based on current speed to match the vibration frequency band. This ensures that the actuator only operates in frequency bands where vibrations actually occur, eliminating useless actuator driving and reducing energy waste while maintaining ease of control implementation.
Solution Approach 2:
The control apparatus automatically adapts its parameters based on speed conditions, making the system self-adjusting. This self-service capability ensures that the control force frequency band automatically matches the vibration frequency band, preventing energy waste without requiring complex external adjustments.
3Adaptability or versatility
If road surface displacement related value obtained at a different speed is used, then the control apparatus can function without speed-matched data, but the vibration suppression effect lowers in frequency bands not contained in the available data
Solution Approach 1:
The patent changes the control force frequency band parameter to match the vibration frequency band corresponding to the current speed. This parameter adjustment ensures that even when using pre-collected road surface displacement data, the control remains effective by aligning the control frequency band with the actual vibration frequency band at the current operating speed.
Data Source
AI summary
A vibration damping control apparatus for a vehicle executes preview vibration damping control while obtaining, from preview reference data, a road surface displacement related value relating to a vertical displacement of a road surface at a predicted passage position of a wheel of the vehicle. In the preview reference data, relationships are established among the road surface displacement related value obtained when a measurement vehicle actually traveled on the road surface, position information representing the position of a wheel of the measurement vehicle when the road surface displacement related value was obtained, and speed information representing the speed of the measurement vehicle when the road surface displacement related value was obtained or representing a speed range in which the speed of the measurement vehicle is contained.