Multi-Axis Acceleration Sensor for Vehicle Turning State Detection
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Solution Overview
Problem
Existing navigation systems face challenges in accurately determining a vehicle's driving state, particularly when the navigation device is not accurately installed, leading to incorrect determinations of straight-driving versus turning states due to the reliance on single-axis acceleration sensors.
Innovation Solution
A method and apparatus using a two-axis or three-axis acceleration sensor to detect and compare acceleration signals from both the driving direction and left/right direction axes, allowing for accurate determination of straight-driving and turning states without being affected by the installation environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-axis acceleration sensor is used to determine turning direction, then the device complexity is reduced, but the measurement precision deteriorates due to installation angle sensitivity
Solution Approach 1:
The patent transitions from using a single-axis acceleration sensor to a two-axis acceleration sensor, adding a dimensional aspect to the measurement. By incorporating both X-axis (driving direction) and Y-axis (left/right direction) acceleration values, the system can accurately determine turning direction regardless of installation angle, as the multi-axis approach provides redundant information that compensates for misalignment.
2Measurement precision
If the acceleration sensor axes are precisely matched with driving and left/right directions, then the measurement precision improves, but the ease of operation deteriorates due to installation burden
Solution Approach 1:
The two-axis acceleration sensor is designed to perform multiple functions: it can determine turning direction accurately regardless of installation orientation, and it can also identify the driving direction itself. This universality eliminates the need for precise pre-alignment during installation, as the sensor adapts to various installation angles while maintaining measurement accuracy.
Solution Approach 2:
The system performs self-alignment by automatically determining the driving direction from the acceleration sensor data without requiring external alignment tools or precise manual installation. The processor analyzes the acceleration patterns to identify which axis corresponds to the driving direction, enabling the system to self-correct for installation angle variations.
3Device complexity
If radical determination method is used with single-axis sensor, then the device complexity is reduced, but the reliability deteriorates due to installation method sensitivity
Solution Approach 1:
By adding the Y-axis measurement dimension to the existing X-axis measurement, the system creates a more robust determination mechanism. The processor compares acceleration values from both axes to determine turning direction, which provides redundancy that compensates for installation angle variations and prevents false turning detections that occur with single-axis radical methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise determination of a vehicle's driving state, reducing errors and burdens associated with incorrect installations, and improving the reliability of navigation systems by using both axes' acceleration values.
Implementation Method 1
an acceleration sensor which is an at least two axes acceleration sensor and detects an acceleration of a moving object
Data Source
AI summary
A method and apparatus of determining a straight-driving state or a turning state of a moving object using an acceleration sensor are provided. The method of determining a turning state using a sensor includes: reading sensor output signals of different axes from an acceleration sensor while a moving object is being driven wherein the acceleration sensor is an at least two axes acceleration sensor and detects an acceleration of the moving object; and comparing the read sensor output signals of the different axes and determining whether the moving object is in a straight-driving state or in a turning state.