Active Suspension Transfer Function Adaptation for Road Vibration Control
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Solution Overview
Problem
Active suspensions in vehicles struggle to adapt their transfer functions to individual vehicle configurations, leading to increased vertical accelerations when driving over uneven road surfaces due to deviations from prototypical designs caused by aging and stress.
Innovation Solution
A method where the vehicle drives along a section of road with a stored surface profile, using shock absorber and tire sensors to record vertical accelerations, which are then transferred to a central computer for optimization of the transfer function, allowing for real-time adaptation to minimize vertical accelerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a predetermined transfer function is used for active suspension control, then the system can operate with a standard design model, but vertical accelerations increase due to deviations from individual vehicle characteristics
Solution Approach 1:
The system records actual vertical accelerations using shock absorber and tire sensors, compares them with expected values from the standard transfer function, and uses this feedback to adapt the transfer function parameters. This closed-loop feedback mechanism allows the system to compensate for individual vehicle deviations while maintaining the benefits of a standard design model.
Solution Approach 2:
The transfer function parameters are adjusted based on recorded vertical acceleration data. By changing the parameters of the transfer function to match actual vehicle behavior, the system adapts to individual characteristics such as aging and stress effects while maintaining the overall structure of the standard control model.
2Reliability
If the transfer function is adapted to individual vehicle characteristics, then vertical acceleration control improves, but system complexity increases
Solution Approach 1:
The system performs self-adaptation by automatically recording vertical accelerations, comparing them with model predictions, and adjusting its own transfer function parameters without external intervention. This self-service approach reduces the need for complex manual calibration systems while achieving individualized adaptation.
Solution Approach 2:
The system creates a digital copy or model of the individual vehicle's actual behavior through recorded data, and uses this copy to adjust the transfer function. This allows adaptation without physically modifying the suspension system, reducing mechanical complexity while achieving individualized control.
3Measurement precision
If sensor systems are used to record vertical accelerations, then adaptation data can be collected, but device complexity and cost increase
Solution Approach 1:
The shock absorber and tire sensors serve dual purposes: they monitor suspension performance for safety and control functions, and simultaneously collect data for transfer function adaptation. This multi-functionality allows precise measurement of vertical accelerations without adding dedicated adaptation sensors, reducing overall system complexity.
Solution Approach 2:
The existing sensor systems act as intermediaries that provide measurement data for both control and adaptation purposes. By utilizing these existing components for dual functions, the system avoids the need for separate dedicated measurement systems, thereby reducing complexity while maintaining measurement precision.
Data Source
AI summary
A method for adapting a transfer function of an active suspension of a vehicle comprises the vehicle driving along a section of road for which a surface profile is stored in a control unit of the vehicle. The active suspension is activated according to a predetermined transfer function for adaptation to the surface profile by means of adjustment values in order to compensate for unevenness of the surface profile. A shock absorber sensor system and/or a tire sensor system of the vehicle is used to record vertical accelerations while driving along the section of road and transfer them to the control unit. The invention provides that the adjustment values and the vertical accelerations are transferred by the vehicle to an external central computer.