Acceleration Sensor Zero-Point Correction Vibration Filtering
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Solution Overview
Problem
Conventional acceleration detection devices experience erroneous correction due to vehicle body vibrations during the transition from a stationary to a running state, leading to deterioration of correction accuracy.
Innovation Solution
The acceleration detection device employs a vibration component elimination unit to remove vehicle body vibrations from the acceleration signal, allowing for a more accurate zero-point correction by calculating a correction value based on the filtered signal, thereby suppressing erroneous corrections caused by vehicle vibrations during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acceleration sensor signal is corrected using the acceleration signal during the transition from stationary to running state, then the drift error correction is performed, but the vehicle body vibration component causes erroneous correction and deteriorates correction accuracy
Solution Approach 1:
The vibration component elimination unit extracts and removes the vehicle body vibration component from the acceleration sensor signal. By separating the harmful vibration component from the useful acceleration signal, the system can perform drift error correction using only the clean acceleration signal without vibration interference, thereby resolving the contradiction between performing correction and avoiding erroneous correction due to vibrations
Solution Approach 2:
The vibration component elimination unit acts as an intermediary between the acceleration sensor signal and the drift error correction calculation. It processes the raw acceleration signal to eliminate vibration components before the signal is used for correction, serving as a mediator that prevents the transmission of harmful vibration effects to the correction process while preserving the useful acceleration information
Data Source
AI summary
An acceleration detection device is provided with a zero point correction unit for correcting a zero point position of a sensor signal by a correction amount based on the acceleration signals when the neutral control starts and ends, respectively, and an acceleration signal Gsen-r that is eliminated of a body vibration from an acceleration signal Gsen-f after passing a filter at transition from a vehicle stationary state to the running state.