Yaw Rate Sensor Steering Angle Determination for Slip Detection
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Solution Overview
Problem
Current methods for controlling a vehicle's differential lock rely on precise slip measurement, which is challenging without accurate steering angle sensors, and existing solutions do not effectively utilize yaw rate sensors for slip detection and drive train control.
Innovation Solution
The method employs a yaw rate sensor to determine the vehicle's steering angle and differential speed, allowing for slip detection and control of the drive train without a separate steering angle sensor, thereby improving traction and reducing the need for steering angle sensor adjustments and configuration measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a steering angle sensor is used to determine steering angle for slip detection, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the steering angle measurement function from the dedicated steering angle sensor and relocates it to the yaw rate sensor. By processing yaw rate data through integration and coordinate transformation, the system obtains steering angle information without requiring a separate steering angle sensor, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The yaw rate sensor is given multiple functions: it not only provides yaw rate information for vehicle stability control but also serves as the primary source for determining steering angle and differential speed. This multi-functional approach eliminates the need for dedicated steering angle sensors and reduces overall system complexity
2Measurement precision
If a steering angle sensor is installed in the vehicle, then steering angle detection accuracy is improved, but manufacturing cost and adjustment work increase
Solution Approach 1:
The patent removes the steering angle sensor from the vehicle system and extracts its measurement function into the yaw rate sensor processing. This eliminates the need for sensor installation, mechanical adjustment, and configuration measurements, significantly improving ease of manufacture while maintaining steering angle detection capability through computational methods
Solution Approach 2:
The system uses existing sensor data (yaw rate and wheel speed sensors) to self-determine steering angle and differential speed without requiring external steering angle sensors. The control unit performs all necessary calculations using available data, eliminating the need for additional hardware installation and adjustment work
3Device complexity
If yaw rate sensor is used to determine steering angle and differential speed, then device complexity is reduced, but measurement precision may worsen
Solution Approach 1:
The system performs preliminary calculations by determining differential speed from yaw rate and wheel speed sensor data before slip detection. By pre-processing the yaw rate data through integration and coordinate transformation to obtain steering angle and differential speed, the system ensures accurate input data is available for slip detection, maintaining measurement precision while using fewer sensors
Solution Approach 2:
The control unit continuously monitors wheel speeds and yaw rate, dynamically calculating differential speed and steering angle. This real-time feedback mechanism allows the system to adjust calculations based on current vehicle conditions, maintaining high precision in slip detection despite using computational methods rather than direct steering angle measurement
4Measurement precision
If steering angle sensor adjustment and configuration measurements are performed, then measurement accuracy is improved, but loss of time increases
Solution Approach 1:
The system eliminates the need for manual steering angle sensor adjustment and configuration by using the yaw rate sensor and wheel speed sensors to self-determine steering angle and differential speed. The control unit automatically performs all necessary calculations without requiring technician intervention for sensor alignment or configuration measurements, completely eliminating the time loss associated with setup
Solution Approach 2:
The patent removes the steering angle sensor adjustment and configuration process entirely by extracting the steering angle measurement function to computational methods based on yaw rate data. This eliminates the time-consuming steps of sensor mechanical adjustment, alignment, and configuration measurements that would otherwise be required
Data Source
AI summary
The method involves determining steering angle (110) of vehicle (100) based on a turning rate (245) of the vehicle. The rotation speeds of two opposed wheels (102,104,106,108) are determined based on turning rate to determine differential rotation speed. The slippage of two opposed wheels of vehicle is determined based on steering angle and differential rotational speed. Independent claims are included for the following: (1) a method for controlling powertrain of vehicle; (2) a device for determining driving parameter of vehicle; and (3) a computer program product for determining driving parameter of vehicle.