Angular Speed Sensor Offset Correction via Temperature Gradient
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Solution Overview
Problem
Existing angular speed sensor correction technologies face challenges in accurately determining the offset value and sensitivity coefficient, especially when the vehicle is not traveling in a straight line or when GPS signals are unavailable, leading to poor precision in angular speed estimation due to temperature changes and varying road conditions.
Innovation Solution
An angular speed sensor correction device and method that acquires positioning data, angular speed, and temperature data to derive a temporary offset value, and uses temperature gradients to calculate an offset value gradient, enabling precise correction of the offset value even in mild temperature changes, thereby improving the precision of angular speed estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the offset value is corrected only when the vehicle stops or travels in a straight line, then the correction method is simple, but the correction frequency is low and precision deteriorates
Solution Approach 1:
The patent changes the correction condition from requiring zero angular speed (vehicle stop or straight line) to using temperature gradient as the triggering parameter. This allows correction to occur during normal driving when temperature changes are detected, significantly increasing correction frequency while maintaining precision through temperature-based compensation
2Productivity
If the offset value is corrected during straight line travel, then correction can occur more frequently, but accuracy is affected by road conditions and driving behavior
Solution Approach 1:
The patent introduces temperature as an intermediary parameter to decouple the correction process from direct angular speed measurements. By using temperature gradient as the basis for correction, the system avoids the influence of road conditions and driving behavior that affect angular speed-based correction methods
3Adaptability or versatility
If GPS signals are unavailable, then self-contained navigation must be used, but angular speed estimation precision deteriorates due to uncorrected offset values
Solution Approach 1:
The patent enables the navigation system to self-correct offset values using temperature gradient detection, making it independent of GPS signals. The temperature-based correction mechanism provides a self-sufficient solution that maintains precision in self-contained navigation mode without requiring external positioning data
Data Source
AI summary
A temperature gradient calculation unit calculates a temperature gradient based on the temperature from the temperature sensor and calculates an average temperature based on the temperature gradient. An offset gradient calculation unit calculates an offset value gradient based on the temperature gradient, the average temperature, and the temporary offset value of the angular speed sensor. A correction value calculation unit calculates the offset value of the angular speed sensor based on the offset value gradient and the temperature gradient.