Yaw Mounting Angle Detection Using Orthogonal Acceleration Axes
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Solution Overview
Problem
Existing acceleration detection systems face reduced calculation accuracy for yaw mounting angles when the vehicle and acceleration sensor are inclined relative to the horizontal plane, particularly due to uneven road surfaces, as they rely on accurate detection of front-rear direction acceleration which is challenging in such scenarios.
Innovation Solution
An acceleration detection device with a first and second orthogonal detection axis, where the yaw mounting angle is calculated using an angle calculation formula derived assuming width direction acceleration and negligible front-rear direction acceleration, allowing for accurate detection even when the sensor is inclined, by setting a virtual line between the axes and using low-pass filters to remove noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acceleration detection device uses a conventional calculation method based on front-rear direction acceleration, then the system structure remains simple, but the measurement precision of yaw mounting angle deteriorates when the vehicle is inclined on uneven road surfaces
Solution Approach 1:
The patent transitions from using only front-rear direction acceleration (one dimension) to utilizing both lateral and longitudinal acceleration components (two dimensions). By incorporating acceleration data from multiple orthogonal directions and performing coordinate transformation, the system achieves accurate yaw mounting angle detection even when the vehicle is inclined, resolving the measurement precision issue without excessive complexity increase.
Solution Approach 2:
The patent changes the calculation parameters from simple front-rear acceleration to a combination of lateral and longitudinal accelerations with coordinate transformation. By introducing additional parameters (lateral acceleration, longitudinal acceleration, gravitational acceleration component) and using trigonometric relationships, the system maintains accuracy under inclined conditions while keeping the computational framework manageable.
2Ease of operation
If the acceleration sensor is mounted with a yaw mounting angle of ±15 degrees or less, then the mounting flexibility is improved, but the measurement precision of vehicle front-rear direction acceleration deteriorates
Solution Approach 1:
The patent compensates for the reduced measurement precision caused by yaw mounting angle by introducing lateral acceleration measurement (another dimension) and using coordinate transformation. Instead of relying solely on the potentially misaligned front-rear sensor, the system combines data from multiple sensor axes to accurately determine vehicle acceleration in the true front-rear direction, thus maintaining mounting flexibility while restoring measurement precision.
Solution Approach 2:
The patent replaces the mechanical assumption of perfect sensor alignment with a computational solution. Rather than requiring precise mechanical mounting, the system uses mathematical transformation of acceleration components from multiple sensor axes to calculate the correct vehicle acceleration, substituting mechanical precision requirements with computational processing.
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 calculation of yaw mounting angles, reducing errors caused by vehicle inclination and ensuring accurate vehicle control, even on uneven road surfaces.
Implementation Method 1
an acceleration sensor that has a first detection axis and a second detection axis orthogonal to each other
Data Source
AI summary
An acceleration detection device includes an acceleration sensor that has a first detection axis and a second detection axis orthogonal to each other such that a yaw mounting angle between a vehicle reference axis and a virtual line is ±15 degrees or less, an acquisition section that acquires an acceleration in a direction of the first detection axis and an acceleration in a direction of the second detection axis, and a mounting angle calculation section that calculates the yaw mounting angle from an angle calculation formula.