Multi-axis Accelerometer for Inclination Detection Without Speed Pulses
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Solution Overview
Problem
Current navigational systems that detect inclination in moving objects rely on speed pulses to compensate for acceleration, which is undesirable as it complicates the detection process.
Innovation Solution
A multi-axis acceleration sensing device with orthogonal sensing axes oriented 45 degrees from the forward-aft axis of the object is used to calculate inclination independently of acceleration, employing the equation α=sin-1(ax+ay²*g)-45°, where ax and ay are sensed accelerations and g is the acceleration due to gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If speed pulses are used to compensate for acceleration in inclination detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the speed pulse generation and processing components from the inclination detection system. By using a multi-axis accelerometer that directly measures acceleration components, the system removes the need for speed pulse generators, encoders, or other rotational sensing devices, thereby simplifying the overall system while maintaining measurement precision
Solution Approach 2:
The patent replaces the mechanical speed pulse generation system with an electronic acceleration sensing system. Instead of using mechanical encoders or speed pulse generators to track vehicle motion, the system uses electronic accelerometers to directly measure acceleration, eliminating complex mechanical components and reducing system complexity
2Measurement precision
If speed pulses are used to compensate for acceleration, then inclination measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The multi-axis accelerometer performs self-service by directly measuring the acceleration components needed for inclination calculation. The device autonomously provides the necessary data (ax and ay components) that can be processed through the provided equation to determine inclination, eliminating the need for external speed pulse generation and complex compensation algorithms
3Measurement precision
If multi-axis acceleration sensing with 45-degree orientation is used, then device complexity increases, but measurement precision improves
Solution Approach 1:
The patent changes the orientation parameter of the accelerometer sensing axes to 45 degrees relative to the vehicle's longitudinal axis. This specific angular parameter allows the acceleration components to be resolved in a way that directly relates to inclination angle through a simple trigonometric relationship, improving measurement precision while keeping the configuration manageable
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 method allows for accurate detection of inclination without relying on speed pulses, improving the simplicity and accuracy of inclination measurement in navigational systems by isolating acceleration effects.
Implementation Method 1
sensing the acceleration of the object using a multi-axis acceleration sensing device that is fixedly attached to the object
Data Source
AI summary
A system and device for detecting inclination that eliminates the need to compensate for the acceleration of the vehicle is disclosed. The system includes a multi-axis acceleration sensing device that is fixedly attached to the object such that each sensing axis of the multi-axis acceleration sensing device lies in a common plane with the forward-aft axis of the object and the sensing axes are orthogonal to one another and each sensing axis is oriented 45 degrees from the forward-aft axis.