Dual-Axis Accelerometer Orientation Independence for Vehicle Stability Control
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Solution Overview
Problem
Existing vehicle stability control systems for heavy goods vehicles require precise orientation of single-axis accelerometers, which complicates their installation across different vehicle configurations, limiting their versatility and accuracy in measuring lateral acceleration.
Innovation Solution
A dual-axis accelerometer system that measures acceleration along two non-parallel axes, allowing for accurate determination of lateral acceleration without needing a specific orientation, and a programmable electronic controller that determines the accelerometer's orientation using vehicle speed signals, enabling a standard system to be fitted across various vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-axis accelerometer is used to measure lateral acceleration, then the measurement can be performed with a simple sensor, but the accelerometer must be mounted in a specific orientation relative to the vehicle, which complicates installation and reduces versatility
Solution Approach 1:
The patent transitions from a single-axis accelerometer to a dual-axis accelerometer, adding another measurement dimension. This allows the system to capture acceleration components along two non-parallel axes simultaneously, enabling accurate lateral acceleration calculation regardless of the accelerometer's mounting orientation on different vehicle configurations.
Solution Approach 2:
The dual-axis accelerometer configuration makes the ECU and accelerometer combination universal and adaptable to a wide range of vehicle types and mounting orientations. The system can accurately measure lateral acceleration on tractors, trailers, semi-trailers, and other heavy goods vehicles without requiring orientation-specific calibration or installation procedures.
2Measurement precision
If the accelerometer orientation is fixed relative to the vehicle, then the lateral acceleration measurement is accurate, but the ECU must be custom-oriented for each vehicle type, increasing device complexity
Solution Approach 1:
By measuring acceleration along two non-parallel axes simultaneously, the system eliminates the need for precise orientation alignment. The dual-axis measurements provide sufficient information to calculate lateral acceleration accurately regardless of the accelerometer's mounting angle, simplifying installation procedures.
Solution Approach 2:
The system automatically determines the accelerometer orientation relative to the vehicle by comparing accelerometer signals with vehicle speed signals from wheel speed sensors. This self-calibration capability eliminates the need for manual orientation adjustment or vehicle-specific ECU configuration, reducing installation and maintenance complexity.
3Adaptability or versatility
If a dual-axis accelerometer is used, then the system can determine lateral acceleration without specific orientation, but the sensor complexity and cost increase
Solution Approach 1:
The patent implements a dual-axis accelerometer that measures acceleration components along two non-parallel axes. This additional measurement dimension provides the mathematical basis for calculating lateral acceleration accurately regardless of mounting orientation, achieving orientation independence while managing the increased sensor complexity.
Solution Approach 2:
The system replaces the mechanical solution of precisely orienting a single-axis accelerometer during installation with a computational approach. The controller processes dual-axis accelerometer signals along with vehicle speed data to calculate lateral acceleration, substituting mechanical precision requirements with algorithmic 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
Enables accurate detection of lateral acceleration and initiation of stability control interventions without user-specific orientation, enhancing the system's versatility and reliability across different vehicle configurations.
Implementation Method 1
accelerometer means, the accelerometer means being configured to measure the acceleration of the vehicle along two non-parallel axes
Data Source
AI summary
An apparatus for controlling the stability of a vehicle including a controller which is adapted to detect when conditions exist under which vehicle rollover is likely and, when such conditions exist, to trigger an alarm signal or initiate a control intervention by means of which the vehicle travel is controlled to reduce the likelihood of vehicle rollover, wherein the apparatus further includes an accelerometer, the accelerometer being configured to measure the acceleration of the vehicle along two non-parallel axes.