Acceleration Detection Device Zero Point Correction Accuracy
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Solution Overview
Problem
Conventional acceleration detection devices experience deterioration in correction accuracy due to vehicle body vibrations and occupant movement during the transition from a stationary to a running state, leading to excessive correction amounts and reduced accuracy in zero point correction.
Innovation Solution
The acceleration detection device restricts the correction amount by calculating a limited correction value based on the acceleration sensor signal during the transition from a stationary to a running state, using a filter to remove noise and a correction amount restriction unit to limit the correction value, thereby suppressing excessive corrections caused by road surface irregularities and occupant movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the correction amount is calculated based on the acceleration sensor signal during the transition from stationary to running state, then the zero point correction is performed, but the correction accuracy deteriorates due to vehicle body vibrations and occupant movement causing excessive correction amounts
Solution Approach 1:
The patent applies parameter changes by modifying the correction amount calculation to account for vehicle body vibrations and occupant movement. Specifically, the system calculates a corrected acceleration value by subtracting the calculated vibration acceleration from the detected acceleration sensor signal, thereby adjusting the correction amount to reflect actual road surface conditions rather than being influenced by transient vibrations
Solution Approach 2:
The patent introduces an intermediary calculation process that separates the useful signal (road surface slope) from the noise (vehicle body vibrations and occupant movement). By calculating the vibration component and subtracting it from the total acceleration signal, the system acts as an intermediary filter that preserves the essential correction information while eliminating harmful vibrations
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 value by using the correction amount (absolute value of a correction value) based on the acceleration when the vehicle transitions from a stopped state on a sloping road to a running state. The acceleration detection device is also provided with a correction amount restriction unit for restricting the correction amount, thereby suppressing calculation of an excessive correction amount due to road surface irregularities or movement of the occupant and deterioration in correction accuracy.