Accelerometer Signal Compensation for Vehicle Motion Errors
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Solution Overview
Problem
Accelerometer-based input devices in vehicles produce erroneous output signals due to vehicle motion, such as acceleration and deceleration, roll, pitch, and yaw, making them ineffective in mobile environments.
Innovation Solution
A system comprising a set of accelerometers and gyroscopic devices fixed within the vehicle provides a reference signal to adjust the input device signals, allowing for accurate determination of user input despite vehicle motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If accelerometer-based input devices are used in moving vehicles, then user interaction with entertainment systems is enabled, but output signals contain errors due to vehicle motion
Solution Approach 1:
A reference accelerometer is introduced as an intermediary device fixed to the vehicle. This reference accelerometer measures vehicle motion separately, and its output is used to compensate for vehicle motion effects in the handheld device signals through signal processing, thereby separating user input from vehicle motion interference
Solution Approach 2:
The system implements feedback by continuously monitoring vehicle acceleration through the reference accelerometer and using this information to adjust and compensate the handheld device signals in real-time, eliminating the harmful effects of vehicle motion on measurement accuracy
2Measurement precision
If vehicle speedometer output is used to compensate accelerometer signals, then some acceleration errors are corrected, but roll, pitch, and yaw errors remain uncorrected
Solution Approach 1:
The system measures all three components of acceleration (x, y, z axes) using the reference accelerometer, providing complete spatial compensation information. This captures all rotational effects (roll, pitch, yaw) that a single-speedometer measurement cannot detect, enabling comprehensive compensation for all vehicle motion parameters
Data Source
AI summary
A method of processing signals from an accelerometer/gyroscopic-based input device includes providing the input device within a vehicle. An accelerometer/gyroscopic-based second device is also provided within the vehicle. The input device is manually actuated while the vehicle is in motion. First signals are transmitted from the input device in response to the manually actuating step. Second signals are transmitted from the second device in response to the motion of the vehicle. The first signals are adjusted dependent upon the second signals.