Adjustable Vibration Damper Control for Fast Chassis Force Response
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Solution Overview
Problem
Existing adjustable vibration dampers face challenges in providing comfort during low-frequency actuating forces combined with road excitations, leading to discomfort, especially during high-frequency excitations and extended cornering.
Innovation Solution
The method involves determining a pump signal and a valve signal based on an actuator characteristic diagram, with a pump characteristic curve that is at least tangent to the characteristic curves representing actuating flows, allowing for quick adaptation of the chassis to changing requirements by prioritizing process speed over optimized actuating force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a normal pump characteristic curve passing through the origin is used, then the computational cost is reduced and process speed is improved, but the comfort behavior deteriorates due to insufficient pump signal amplification
Solution Approach 1:
The pump characteristic curve is modified by introducing an offset parameter that shifts the curve vertically. This parameter change amplifies the pump signal relative to the actuating force requirement, improving comfort behavior while maintaining the computational efficiency of the simplified linear model
2Object-affected harmful factors
If the pump characteristic curve is adjusted with an offset to amplify pump signal, then comfort behavior is improved, but the computational complexity and signal processing ambiguity increase
Solution Approach 1:
The offset is not fixed but is dynamically adjusted based on driving condition parameters such as roadway signals. This allows the system to maintain simplicity by using a linear model while adapting the offset parameter to optimize comfort under different operating conditions
Solution Approach 2:
The system uses roadway signals from acceleration sensors as feedback to determine the appropriate offset value. This feedback mechanism allows the pump characteristic curve to adapt to actual road conditions, improving comfort without requiring complex signal processing
3Device complexity
If the slope of the linear pump characteristic curve is kept constant, then signal processing is simplified, but the adaptability to different driving conditions deteriorates
Solution Approach 1:
The pump characteristic curve transitions from a static linear function to a dynamic curve whose slope varies with driving condition parameters. This allows the system to maintain computational simplicity while adapting to different road conditions by modifying the curve shape based on real-time feedback
Data Source
AI summary
A method for controlling an adjustable vibration damper with an adjustable damping valve and work chamber connected to a hydraulic device comprising a pump and motor. A calculated resulting vibration damper supporting force comprises a passive damping force of the adjustable damping valve and an active actuating force of the hydraulic device. Based on an actuating force requirement of a controller unit at the vibration damper, pump and valve signals are determined for the adjustable damping valve. The pump and valve signals are determined based on an actuator characteristic diagram which comprises characteristic curves for actuating flows for actuating the adjustable damping valve. A pump characteristic curve is tangential to the characteristic curves representing the actuating flows for a determination of the pump and valve signals is made via a contact point of the pump characteristic curve with a current characteristic curve in combination with the actuating force requirement.