Vehicle Rollover Warning Control Device Using Dynamic Lateral Acceleration
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Solution Overview
Problem
Existing methods for warning drivers of commercial vehicles about impending rollover risks are inefficient, as they require significant effort to set threshold values and do not accurately account for vehicle type and load distribution, leading to unnecessary warnings and reduced precision.
Innovation Solution
A control device that detects instantaneous lateral acceleration and determines a rollover-critical value based on vehicle behavior during cornering, eliminating the need for pre-defined threshold values and adapting warnings to current conditions, using sensors and rotational speed differences to assess lateral acceleration and wheel loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed threshold value is used for warning of rollover risk, then the warning system is simple to implement, but it requires significant effort to set appropriate threshold values for different vehicle types and load conditions
Solution Approach 1:
The control device automatically determines the rollover-critical lateral acceleration value by analyzing vehicle behavior during cornering, eliminating the need for manual threshold setting. The system performs self-calibration by detecting wheel loading conditions and computing the critical acceleration value based on observed vehicle responses during test cornering maneuvers.
Solution Approach 2:
The system changes the threshold parameter dynamically by determining it automatically based on actual vehicle behavior rather than using fixed predetermined values. The rollover-critical lateral acceleration value is computed from measured vehicle responses during cornering, allowing adaptation to different vehicle types and load conditions without manual intervention.
2Ease of operation
If a fixed threshold value or vehicle mass-based table is used, then the system is simpler to operate, but it does not accurately account for load distribution and height, leading to reduced precision in rollover risk assessment
Solution Approach 1:
The system uses feedback from lateral acceleration sensors and wheel speed sensors to continuously monitor vehicle behavior during cornering. By analyzing the relationship between lateral acceleration and wheel loading conditions, the system computes an accurate rollover-critical acceleration value that reflects actual load distribution and height effects.
Solution Approach 2:
The patent replaces manual threshold setting and static mass-based tables with an automated electronic determination system. The control device uses sensor data and computational algorithms to dynamically calculate the rollover-critical lateral acceleration value, substituting mechanical/manual processes with electronic sensing and processing.
3Adaptability or versatility
If vehicle mass is used as the basis for determining threshold values, then some adaptation to different loads is achieved, but it still does not provide accurate information about load height and distribution
Solution Approach 1:
The system continuously monitors vehicle behavior during cornering and uses this feedback to determine the rollover-critical acceleration value. By observing actual wheel loading conditions and lateral acceleration responses, the system accurately captures the effects of load distribution and height without relying solely on mass information.
Solution Approach 2:
The system transitions from static mass-based threshold determination to dynamic behavior-based determination. The rollover-critical lateral acceleration value is computed from actual vehicle responses during cornering maneuvers, allowing the system to adapt to changing load conditions in real-time rather than relying on predetermined mass-based tables.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a more precise and adaptive warning system that can be applied to various vehicle types, reducing unnecessary warnings and improving driver response to actual rollover risks, without requiring special adjustments for different track widths or load distributions.
Implementation Method 1
a control device detecting an instantaneous lateral acceleration of the vehicle
Implementation Method 2
using sensors and rotational speed differences to assess lateral acceleration and wheel loading
Data Source
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AI summary
The invention relates to a method for warning the driver of a vehicle (2, 3) of a risk of overturning of the vehicle (2, 3) about its longitudinal axis, wherein a control device (13) detects the current transverse acceleration (aq) of the vehicle (2, 3) and emits a warning signal based thereon in the event of a risk of overturning, wherein the control device (13) additionally makes the warning signal dependent upon at least one transverse acceleration value (aq,Krit), which is critical for overturning, detected by the control device (13) while the vehicle (2, 3) is being driven, and a measurement of the transverse acceleration of the vehicle (2, 3) at which the vehicle (2, 3) would actually overturn about its longitudinal axis, wherein the transverse acceleration value (aq,Krit) that is critical for overturning is determined automatically based on the vehicle behaviour during curve driving. The invention further relates to a control device having a program that comprises program code means.