Yaw Rate Sensor Offset Correction for Cruise Control
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Solution Overview
Problem
Existing yaw rate sensors in vehicle cruise control systems face accuracy issues due to sensitivity to noise and temperature variations, especially at low speeds, which affect the precision of heading direction estimation and require high correction precision that existing methods struggle to meet.
Innovation Solution
An apparatus and method that determine the vehicle's status as driving or stopped, using sensors like radar, G sensors, and steering angle sensors to correct yaw rate sensor offsets by estimating and measuring yaw rates and applying bias voltage corrections based on vehicle speed and position changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yaw rate sensor is used for heading direction estimation in cruise control systems, then stable performance regardless of vehicle speed is achieved, but the sensor becomes very sensitive to noise and tiny movements at low speeds, significantly changing the sensor value and reducing accuracy
Solution Approach 1:
The patent introduces an intermediary correction system that uses multiple sensors (steering angle sensor, lateral acceleration sensor, radar) to calculate a reference yaw rate and compare it with the actual yaw rate sensor output. The difference is used to generate a correction value that compensates for noise and tiny movements at low speeds, thereby maintaining measurement precision while preserving the stable performance characteristic of the yaw rate sensor
2Measurement precision
If electronic stability control device corrects the yaw rate sensor offset, then some correction is achieved, but the correction precision is insufficient to satisfy the high requirements of smart cruise control systems
Solution Approach 1:
The patent segments the correction process into distinct functional units: a status determination unit that identifies vehicle operating conditions, a correction value calculation unit that computes correction values based on multiple sensor inputs, and a yaw rate correction unit that applies the correction. This segmentation enables high precision correction while managing system complexity through modular design
Solution Approach 2:
The correction system is designed to be universally applicable across different vehicle operating conditions (low speed, high speed, stationary). It multi-functionally handles various correction scenarios by determining vehicle status and selecting appropriate correction methods, thereby achieving high correction precision without requiring separate complex systems for each condition
3Measurement precision
If the yaw rate sensor offset is corrected based on vehicle status (driving or stopped), then correction accuracy is improved, but the system complexity increases due to status determination requirements
Solution Approach 1:
The patent implements a dynamic correction system that automatically adapts to different vehicle statuses. The status determination unit continuously monitors vehicle conditions and dynamically adjusts the correction approach accordingly. This dynamic adaptation improves correction accuracy while managing complexity through automated status-based decision logic rather than requiring manual intervention or overly complex fixed-structure systems
Data Source
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AI summary
The present invention suggests an offset correcting apparatus of a yaw rate sensor which corrects an offset of a yaw sensor in accordance with a status of a vehicle in a cruise control system, a method thereof, and a vehicle speed control system including the apparatus. The suggested offset correcting apparatus of a yaw rate sensor includes a current status determining unit which determines a status of its own vehicle as one of a driving vehicle and a stopped vehicle; a first offset correcting unit which if its own vehicle is determined as the driving vehicle, corrects the offset of the yaw rate sensor which is installed in its own vehicle when its own vehicle is being driven in a straight line; and a second offset correcting unit which if its own vehicle is determined as the stopped vehicle, corrects the offset of the yaw rate sensor when the position of its own vehicle is not changed.