Vehicle Dynamic Control Bank Angle Compensation
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Solution Overview
Problem
Current dynamic control systems for vehicles do not account for bank angles, which affects the differentiation between steering inputs for maintaining vehicle path on level roads and compensating for road bank, leading to inadequate control responses.
Innovation Solution
A control system that determines calculated lateral velocity and yaw rate using sensors for front and rear lateral tire forces and bank angles, enabling the vehicle's safety system to respond accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control system models do not take into consideration bank angles, then the system is simpler to implement, but the system cannot differentiate between steering inputs for level road and banked road conditions
Solution Approach 1:
The system performs preliminary calculation of bank angles using sensor data (accelerometers, gyroscopes, steering angle sensors) before processing steering inputs. This pre-computed bank angle information is then integrated into the control model to enable accurate differentiation between level and banked road conditions without adding complex real-time processing requirements.
2Measurement precision
If bank angle compensation is implemented, then driver's intent can be accurately determined, but additional sensors and calculations are required
Solution Approach 1:
The control system integrates multiple existing sensors (accelerometers, gyroscopes, steering angle sensors) to serve multiple functions: detecting vehicle dynamics, calculating bank angles, and determining driver intent. This multi-functional approach achieves accurate driver intent determination without requiring dedicated additional hardware for each function.
Solution Approach 2:
The system introduces bank angle calculations as an intermediary parameter that mediates between raw sensor data and control decisions. This intermediate representation enables the system to accurately interpret driver intent by filtering out steering inputs that are merely compensating for road bank rather than indicating actual directional changes.
3Reliability
If control angles are converted to control signals without bank angle consideration, then the control response is faster, but the control response is inadequate for banked road conditions
Solution Approach 1:
Bank angle calculations are performed in advance using pre-existing sensor data, so that when control decisions need to be made, the bank angle information is already available. This eliminates the need for time-consuming real-time bank angle computations during critical control moments, maintaining fast response times while ensuring adequate control responses for banked roads.
Data Source
AI summary
A control system (18) and method for an automotive vehicle (10) includes a lateral acceleration sensor (32) for generating a lateral acceleration signal, a yaw rate sensor (28) for generating a yaw rate signal, and a safety system. The safety system (44) and the sensors are coupled to a controller (26). The controller (26) determines a front lateral tire force and a rear lateral tire force from the vehicle yaw rate signal and the vehicle lateral acceleration signal; determines a calculated lateral velocity from the front lateral tire force, the rear lateral tire force, and a bank angle; determines a calculated yaw rate from the front lateral tire force and the rear lateral tire force; and controls the safety system in response to the calculated lateral velocity and the calculated yaw rate.