Vibration Damper Damping Force Control via Dynamic Lower Limit
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Solution Overview
Problem
Existing methods for setting damping force in motor vehicle vibration dampers connected between the vehicle body and wheels do not allow for individual adjustment of damping force within different operating ranges based on vertical movement of the vehicle body and wheel, which limits driving comfort and safety.
Innovation Solution
The method involves determining the lower limiting value of the damping force's actuating range as a function of the vertical movement direction and relative movement between the vehicle body and wheel, allowing for individual adjustments in four distinct operating ranges, enabling optimized damping force settings for improved comfort and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lower limiting value of the actuating range is determined as a function of vertical movement of the vehicle body and wheel, then driving comfort and safety are improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by determining the lower limiting value of the actuating range as a function of vertical movement parameters (vehicle body movement and wheel movement) rather than using fixed values. This dynamic parameter adjustment allows the damping force to adapt to different driving conditions, improving both comfort and safety while managing system complexity through mathematical relationships.
Solution Approach 2:
The invention implements dynamics by making the lower limiting value of the actuating range variable based on real-time vertical movement conditions. Instead of a static control system, the damping force parameters dynamically adjust according to the measured movements of the vehicle body and wheels, enabling the system to respond to changing driving situations.
2Ease of operation
If the damping force is adjusted for different operating ranges, then driving comfort is improved, but the control complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the vertical movement into four distinct operating ranges based on the direction and relative movement between the vehicle body and wheels. Each range has its own optimized lower limiting value, allowing the system to provide tailored damping characteristics for different driving scenarios such as body movement with wheel movement, body movement against wheel movement, and various relative speed conditions.
Solution Approach 2:
The invention implements local quality by assigning different lower limiting values to different operating ranges. Each range receives a specifically optimized damping parameter setting suited to its characteristics, rather than using a uniform parameter across all conditions. This localized optimization enhances comfort for each specific driving situation.
3Reliability
If the lower limiting value is optimized for each operating range, then wheel damping performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the lower limiting value for each of the four operating ranges based on the specific requirements of each range. The control system stores and applies different parameter sets corresponding to each operating condition, enabling optimized wheel damping performance without requiring physical modifications to the vibration damper hardware.
Data Source
AI summary
A method for setting the damping force for at least one motor vehicle vibration damper which is connected between a vehicle body and a wheel, wherein, for the vibration damper or for each vibration damper, a damping force is determined and set within an actuating range defined by a lower limiting value and an upper limiting value, as a function of a vertical movement of the vehicle body, and as a function of a vertical movement of the respective wheel, and wherein the lower limiting value of the actuating range is also determined as a function of the vertical movement of the vehicle body and as a function of the vertical movement of the respective wheel.