Yaw Rate Sensor Correction During Vehicle Turning
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Solution Overview
Problem
Existing yaw rate detection apparatuses are limited in calibrating vehicle yaw rate sensors during non-straight traveling conditions, such as turning, due to temperature changes, which may prevent accurate detection of vehicle yaw rates.
Innovation Solution
A yaw rate detection apparatus that includes a vehicle yaw rate detection device, wheel speed detection devices for right and left wheels, a wheel speed yaw rate calculation device, a turning correction coefficient calculation device, and a correction device that uses turning correction coefficients to correct the vehicle yaw rate detection values, even during turning, by calculating time average correction values and alerting the driver to abnormal air pressure differences between wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is limited to straight traveling conditions, then calibration accuracy is improved, but calibration opportunities are reduced
Solution Approach 1:
The patent introduces a turning correction coefficient that changes based on the turning angle detected by a steering angle sensor. This coefficient is applied to correct the yaw rate detection value during turning, allowing the system to maintain accuracy across different driving conditions rather than being limited to straight traveling only.
Solution Approach 2:
The patent uses the steering angle sensor as an intermediary to detect turning conditions and generate a correction coefficient. This intermediary mechanism enables the system to distinguish between straight and turning travel, applying appropriate corrections only when needed, thus resolving the contradiction between maintaining accuracy and providing continuous calibration opportunities.
2Measurement precision
If temperature compensation is applied continuously, then detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent applies correction periodically based on detected turning events rather than continuously. The correction process is triggered only when turning is detected through the steering angle sensor, and the correction coefficient is applied during these specific periods. This periodic correction approach maintains detection accuracy while significantly reducing energy consumption compared to continuous calibration.
Data Source
AI summary
A yaw rate detection apparatus includes: a vehicle yaw rate detection device detecting a yaw rate of a vehicle to output a detection value thereof; a right-wheel and left-wheel speed detection device detecting at least speeds of right and left wheels to output detection values thereof; a wheel speed yaw rate calculation device calculating a wheel speed yaw rate from the detection values of the speeds of the right and left wheels; a turning correction coefficient calculation device calculating a turning correction coefficient based on an amount of turning associated with a turning operation within a predetermined time in which the detection value of the vehicle yaw rate deviates due to a temperature change; and a vehicle yaw rate correction device correcting the detection value of the vehicle yaw rate based on the detection value of the vehicle yaw rate, the wheel speed yaw rate and the turning correction coefficient.