Dynamic Limiting Values for Vehicle State Variables
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driver assistance systems face challenges in maintaining functionality and effectively responding to accidents due to potential sensor signal inaccuracies and mechanical stress, which can lead to reduced system performance and increased accident consequences.
Innovation Solution
A method to dynamically set limiting values for vehicle state variables based on accident severity, utilizing sensor data such as acceleration values to adjust system functionality, allowing for flexible responses to varying accident conditions and ensuring continued operation of the driver assistance system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver assistance system uses fixed limiting values for sensor signal monitoring, then the system operation is simple and reliable under normal conditions, but the system functionality is reduced in the event of an accident due to sensor signal inaccuracies and mechanical stress
Solution Approach 1:
The patent implements dynamic adaptation of limiting values based on detected accident conditions. The system transitions from fixed limiting values to dynamically adjusted limiting values when an accident is detected, allowing the driver assistance system to maintain functionality despite sensor signal inaccuracies and mechanical stress during and after the accident.
Solution Approach 2:
The patent changes the parameter of limiting values from fixed to variable based on accident severity. By detecting accident conditions and subsequently adjusting the limiting values used for sensor signal monitoring, the system adapts its operational parameters to maintain reliability under altered conditions following an accident.
2Measurement precision
If the system switches to a lower functionality mode in response to sensor signal issues, then measurement precision is maintained, but system productivity and accident response capability are reduced
Solution Approach 1:
The patent dynamically adjusts the operational mode based on whether an accident has been detected. In normal conditions, the system uses standard monitoring with fixed limiting values. Upon detecting an accident, it transitions to a special operational mode with dynamically adjusted limiting values, maintaining measurement precision while preserving accident response capability.
Solution Approach 2:
The patent converts the potentially harmful effect of sensor signal inaccuracies during accidents into a manageable condition by adjusting the limiting values accordingly. This allows the system to continue functioning with modified tolerance levels that account for the altered sensor characteristics following an accident.
3Device complexity
If the limiting value is set as a fixed variable, then the system complexity is low, but the system cannot flexibly respond to varying accident severity levels
Solution Approach 1:
The patent introduces dynamic adjustment of limiting values based on detected accident conditions. The system monitors for accidents and automatically adjusts the limiting values from fixed to dynamically determined values, enabling flexible response to varying accident severity levels without requiring complex manual reconfiguration.
Solution Approach 2:
The system performs self-adjustment of limiting values based on its own detection of accident conditions. The driver assistance system automatically determines when an accident has occurred and adjusts its operational parameters accordingly, without requiring external intervention or complex external control systems.
Data Source
AI summary
In a method for setting a limiting value of a vehicle state variable in a driver assistance system, in particular in an electronic stability program ESP, accelerations are measured by the airbag sensor system, and are used in the event of an accident of low to medium severity to determine limiting values of the yaw acceleration and the yaw rate. These limiting values are used for monitoring the functionality of the yaw rate sensor.