Road-Adaptive Suspension Control for Vibration and Power Reduction
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Solution Overview
Problem
Conventional suspension devices increase power consumption and control burden due to indiscriminate use of active suspension for road vibrations and response delays in suppressing high-frequency oscillations.
Innovation Solution
A suspension control apparatus and method that includes a road surface shape measurement device, actuator control device, and actuator drive selection device to selectively control an active suspension and damper based on road surface information, reducing power consumption by adjusting vehicle height and damping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active suspension is driven for all road vibrations, then the vibration suppression performance is improved, but the power consumption is increased
Solution Approach 1:
The system performs preliminary classification of road surface vibrations into low-frequency (road shape) and high-frequency (roughness) components before applying appropriate suppression strategies. This preliminary action allows the active suspension to focus only on low-frequency vibrations while the damper handles high-frequency vibrations, reducing unnecessary active suspension operation and power consumption
Solution Approach 2:
The control system applies different suppression characteristics to different frequency components of vibration. Low-frequency vibrations are suppressed by the active suspension with slow response, while high-frequency vibrations are suppressed by the damper with fast response. This localized quality approach ensures each system operates in its optimal frequency range, improving overall efficiency
2Reliability
If the active suspension is used to remove high frequency vibration, then the vibration suppression is improved, but the response delay increases and control burden increases
Solution Approach 1:
The system assigns different frequency ranges to different suppression mechanisms: the damper handles high-frequency vibrations with fast response characteristics, while the active suspension handles low-frequency vibrations. This local quality differentiation eliminates the response delay problem by ensuring the active suspension is not burdened with high-frequency vibration suppression tasks it cannot respond to quickly enough
3Reliability
If the active suspension and damper are used simultaneously without distinction, then the vibration suppression coverage is improved, but the device complexity and control difficulty increase
Solution Approach 1:
The control system segments the vibration suppression task by frequency: low-frequency vibrations are assigned to the active suspension while high-frequency vibrations are assigned to the damper. This segmentation simplifies the control logic by providing clear division of labor between the two systems, reducing control complexity while maintaining comprehensive vibration suppression coverage
Solution Approach 2:
The system performs preliminary frequency analysis to classify vibrations before applying suppression control. By pre-classifying vibrations into low-frequency and high-frequency components, the control system can directly route each component to the appropriate suppression mechanism without complex real-time decision-making, reducing control difficulty
Data Source
AI summary
A suspension control apparatus and a suspension control method are provided that can appropriately suppress road surface vibration transmitted to a vehicle body during traveling, and can reduce power consumption by estimating the road surface shape in front of a vehicle, and changing driving of an active suspension and a damper based on this information.A suspension control apparatus that controls a suspension device to be attached to wheels of a movable body, the suspension device consisting of an active suspension capable of adjusting a vehicle height, and a damper capable of adjusting a damping force, the suspension control apparatus including a road surface shape measurement device that obtains a road surface shape, an actuator control device that controls driving of the suspension device, and an actuator drive selection device that changes driving of the suspension device based on information obtained by the road surface shape measurement device.