Vehicle Suspension Damping Control for False-Positive Road Detection
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Solution Overview
Problem
Existing vehicle suspension systems face challenges in accurately detecting roadway anomalies, leading to false-positive detections and unnecessary damper adjustments, which can deteriorate ride comfort and reduce the effectiveness of vibration damping.
Innovation Solution
A method for controlling vertical vibration damping in vehicle wheels, utilizing a first sensor to detect roadway anomalies and a second sensor to monitor vertical displacement, with a control unit adjusting the damping characteristics based on minimum height and speed criteria to prevent erroneous detections and ensure robust damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the damping of vibration dampers is set at a low level to provide high comfort, then ride comfort is improved, but vertical loads increase when the vehicle traverses roadway anomalies
Solution Approach 1:
The vibration damper damping characteristics are made dynamically adjustable through a control system that modifies damping levels based on detected roadway conditions. The system transitions from static low damping (comfort-oriented) to dynamic adaptation, increasing damping when roadway anomalies are detected ahead, thus resolving the contradiction between comfort and load control.
Solution Approach 2:
The system performs preliminary detection of roadway anomalies using optical sensors (camera or laser scanner) before the vehicle reaches them. Based on this advance information, the control system proactively adjusts the vibration damper characteristics in anticipation of upcoming bumps or irregularities, preventing excessive vertical loads before they occur.
2Adaptability or versatility
If optical sensors are used to detect roadway anomalies ahead, then dynamic adaptation of damping characteristics is enabled, but false-positive detections occur leading to unnecessary damper adjustments
Solution Approach 1:
The system incorporates feedback from multiple sensors including optical detection means (camera/laser scanner) and vibration sensors mounted on the vehicle chassis. The control unit continuously compares expected vibrations based on optical anomaly detection with actual vibration sensor measurements, using this feedback to confirm or reject false-positive detections and adjust damping characteristics only when anomalies are verified.
Solution Approach 2:
Vibration sensors serve as intermediary verification elements between the optical detection system and the vibration damper control. Rather than directly translating optical anomaly detection into damper adjustment, the system uses vibration sensor data as an intermediate check to filter false positives, ensuring more reliable control decisions.
3Loss of time
If camera sensors or laser scanners are used for forward-looking detection, then roadway anomalies can be detected in advance, but the system complexity increases
Solution Approach 1:
The control unit is designed to handle multiple detection methods (camera-based optical detection, laser scanner-based detection, and vibration sensor detection) through a universal control algorithm. This multi-functional approach allows the system to use different sensor types depending on availability and conditions, reducing overall system complexity while maintaining advance detection capability.
Solution Approach 2:
Instead of using complex specialized sensors, the system can utilize existing vehicle components such as the camera already present in many modern vehicles for navigation and driver assistance systems. This copying approach repurposes existing optical detection infrastructure for suspension control, reducing additional system complexity while enabling forward-looking anomaly detection.
Data Source
AI summary
A method for controlling a vertical vibration damping of a wheel of a vehicle, in which the wheel has a suspension including a vibration damper with a control element including an actuating element for adapting a damping characteristic of the vibration damper includes a series of steps. The vehicle includes a first sensor for detecting roadway anomalies, a second sensor for detecting a vertical displacement of the wheel, and a control unit connected to the first and second sensors and the control element. The method steps include detecting roadway anomalies with the first sensor, detecting the vertical displacement with the second sensor and switching the vibration damper with the control element at a first point in time from a first state with a first damping characteristic into a second state with a second damping characteristic when a first sensor signal generated by the first sensor indicates a roadway anomaly with a minimum height.