Vehicle Sideslip Speed Calculation via Image-Based Position Correction
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Solution Overview
Problem
Conventional control devices for vehicles fail to accurately calculate sideslip speed, leading to inaccurate deployment of airbags during rollover situations due to deviations in detected acceleration-based calculations.
Innovation Solution
A control device that includes a speed detection unit, steering angle detection unit, and image-capturing unit to calculate an estimated running path and sideslip speed based on actual and estimated positions of the vehicle after a predetermined time interval, enhancing accuracy in determining rollover situations and airbag deployment timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sideslip speed is calculated by integrating acceleration detected by acceleration sensor, then the calculation can be performed, but the calculated sideslip speed is significantly deviated from actual sideslip speed
Solution Approach 1:
The patent introduces image-capturing units as intermediary devices to capture road surface images and calculate running position independently of acceleration sensors. This intermediary measurement method provides accurate position data that serves as a reference for correcting sideslip speed calculations, resolving the deviation problem without directly modifying the acceleration-based calculation method.
Solution Approach 2:
The system implements feedback by comparing the estimated running position (calculated from acceleration integration) with the actual running position (calculated from image processing). The position deviation is fed back to correct the sideslip speed calculation, creating a closed-loop system that continuously improves measurement accuracy.
2Ease of operation
If acceleration sensor is used to detect width direction acceleration, then the control device can determine rollover possibility, but the deployment timing of air bag becomes inaccurate
Solution Approach 1:
The patent replaces the purely mechanical acceleration-based measurement system with an optical measurement system using image-capturing units. By capturing images of the road surface and calculating position from these images, the system substitutes optical information for mechanical sensor data, achieving more accurate deployment timing while maintaining rollover determination capability.
3Device complexity
If only acceleration sensor data is used for sideslip speed calculation, then the device complexity is low, but the measurement precision is insufficient
Solution Approach 1:
The image-capturing units serve multiple functions: they capture road surface images for position calculation, provide reference data for sideslip speed correction, and can potentially be used for other vehicle control functions. This multi-functionality justifies the added device complexity by providing comprehensive measurement capabilities from a single sensor type.
Data Source
AI summary
There is provided a control device for vehicle. A sideslip speed which is the moving speed of a vehicle in the width direction is calculated on the basis of an estimated running position of the vehicle after a predetermined time interval has elapsed from a time at a starting running position of the vehicle on the estimated running path, and the actual running position of the vehicle after the predetermined time interval has elapsed from the time at the starting running position of the vehicle on the estimated running path.