Vehicle Stabilization via Side Slip Angle Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vehicle stabilization systems, such as ESP, are complex due to the need for multiple sensors and require significant effort to adjust controller parameters, making them costly and inefficient.
Innovation Solution
A system that uses a speed sensor to detect longitudinal and lateral speeds, calculates the side slip angle, and compares it to a threshold to determine oversteer or understeer situations, allowing for simpler stabilization through actuator control, such as braking, without the need for a yaw rate sensor and with reduced complexity in sensor installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a yaw rate control system with multiple sensors is used to stabilize the vehicle, then the vehicle stabilization effectiveness is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the yaw rate sensor from the traditional stabilization system, keeping only the essential speed sensor while maintaining stabilization functionality through side slip angle control. This reduces device complexity while preserving the core stabilization function.
Solution Approach 2:
The patent replaces the expensive yaw rate sensor with a simpler, more cost-effective speed sensor that can be obtained from existing vehicle equipment. This substitution reduces system cost and complexity while achieving the same stabilization objective through a different control approach.
2Reliability
If traditional yaw rate control with multiple sensors is implemented, then vehicle stabilization is achieved, but the parameter adjustment effort and cost increase
Solution Approach 1:
By removing the yaw rate sensor and its associated complex vehicle model parameters, the system eliminates the need for time-consuming parameter adaptation. The speed sensor-based approach requires fewer calibration parameters, significantly reducing adjustment effort and manufacturing complexity.
3Device complexity
If a speed sensor-based side slip angle control is used, then the device complexity is reduced, but the measurement precision for vehicle attitude may be affected
Solution Approach 1:
The patent introduces the side slip angle as an intermediary parameter that can be calculated from speed sensor data. This intermediary variable serves as an effective proxy for vehicle attitude, providing sufficient measurement precision for stabilization control without requiring direct attitude sensors.
Solution Approach 2:
The patent replaces direct mechanical attitude sensing (yaw rate sensor) with a calculated approach using speed data. This substitution maintains measurement precision by deriving side slip angle from reliable speed measurements, achieving the same control objective through a different measurement paradigm.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a system for stabilizing a motor vehicle (101), comprising - at least one speed sensor (111) for detecting a longitudinal speed and a transversal speed of the motor vehicle (101); - a calculation unit, designed for calculating a side slip angle of the motor vehicle (101) from the detected longitudinal speed of the vehicle and the detected transversal speed of the vehicle; - an evaluation unit coupled with the calculation unit, designed for comparing the side slip angle with a predetermined threshold value in order to detect an oversteering situation, when the side slip angle exceeds the threshold value; - a control unit coupled to the evaluation unit and an actuator (109) influencing the driving behavior of the motor vehicle (101), wherein the control unit is designed for controlling the actuator (109) in an oversteering situation. The invention further relates to a system, which is suitable for carrying out said method.