Vehicle Dynamics Model for Dangerous Driving Indicator
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Solution Overview
Problem
Existing methods for assessing dangerous driving are inadequate as they rely solely on vehicle acceleration, which is influenced by external factors and not representative of driving danger, and require numerous parameters, making them unsuitable for production vehicles with minimal sensor definitions.
Innovation Solution
A method using a simple physical model based on vehicle dynamics to determine vehicle slip parameters, such as lateral slip angle and longitudinal slip rate, which are used to derive a more representative and robust indicator of dangerous driving, considering factors like road state, weather, and tire conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple acceleration threshold method is used to assess dangerous driving, then the assessment method is easy to implement, but the assessment accuracy is poor because acceleration is influenced by external factors like weather and road conditions
Solution Approach 1:
The patent transforms the assessment from using raw acceleration parameters to using slip parameters (lateral slip angle and longitudinal slip rate) derived from a vehicle dynamics model. This parameter transformation allows the system to account for external factors like road conditions and weather, improving assessment accuracy while maintaining implementation feasibility through a simplified dynamic model
Solution Approach 2:
The patent introduces a simplified vehicle dynamics model as an intermediary between the raw sensor data (position, acceleration) and the dangerous driving assessment. This model acts as a mediator that processes the raw data into slip parameters, filtering out the influence of external factors while preserving the essential dangerous driving information
2Measurement precision
If a comprehensive vehicle dynamics model with many parameters is used to accurately represent vehicle behavior, then the model accuracy is high, but the complexity of measurements and parameters required is too high for production vehicles
Solution Approach 1:
The patent extracts only the essential elements needed for dangerous driving assessment from the comprehensive vehicle dynamics model. By focusing specifically on slip parameters (lateral slip angle and longitudinal slip rate) and using a simplified dynamic model, it removes unnecessary complexity while retaining sufficient accuracy for the intended application
Solution Approach 2:
The patent segments the vehicle dynamics model into minimal necessary components - using only position and acceleration measurements from standard sensors to compute slip parameters. This segmentation allows the system to achieve adequate model accuracy using only the sensor suite available in production vehicles, without requiring extensive instrumentation
Data Source
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AI summary
The present invention consists of determining at least one dangerous driving indicator (IND) by means of a physical model (MOD) based on the dynamics of the vehicle. According to the invention, the vehicle dynamics model (MOD) makes it possible to determine a skidding parameter (β, SR) of the vehicle, which is used to deduce a representative dangerous driving indicator (IND).