Foldable Accelerometer Compensation for Hinge Stuck Conditions

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Solution Overview

Problem

Foldable electronic devices with accelerometers suffer from mechanical breakdowns leading to stuck conditions, causing inaccurate acceleration measurements along specific axes and inducing offsets in other axes due to mechanical components becoming immovable.

Innovation Solution

A method and device for detecting a stuck condition in a first accelerometer by exploiting redundant information from a second accelerometer and applying runtime calibration of undesired offsets to compensate for inaccurate measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single accelerometer is used in foldable devices, then device complexity is reduced, but measurement reliability deteriorates due to mechanical breakdowns causing stuck conditions

Engineering Contradiction:

Improvenumber of accelerometersVSAvoidaccelerometer measurement reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies local quality by having different accelerometers serve different functional roles based on their operational status. The first accelerometer serves as the primary sensor during normal operation, while the second accelerometer serves as a backup that becomes active when the first accelerometer enters a stuck condition. This localized functional differentiation resolves the contradiction by ensuring measurement reliability through role assignment without unnecessarily increasing overall system complexity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements beforehand cushioning by pre-configuring a second accelerometer as a backup sensor before any mechanical breakdown occurs. The system continuously monitors for stuck conditions and has pre-established compensation algorithms ready to activate. This preparatory measure ensures that when the first accelerometer fails, the system can immediately switch to using the second accelerometer for compensation, thereby maintaining measurement reliability without requiring complex real-time decision-making during failure scenarios.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If multiple accelerometers are deployed for redundancy, then measurement reliability improves, but device complexity increases

Engineering Contradiction:

Improveaccelerometer measurement reliabilityVSAvoidnumber of accelerometers

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by implementing a dynamic switching mechanism between the first and second accelerometers based on real-time operational status. The system continuously monitors the first accelerometer for stuck conditions and dynamically activates the second accelerometer only when needed. This dynamic approach allows the system to maintain high measurement reliability through redundancy while minimizing the actual impact on device complexity, as the second accelerometer remains dormant during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent utilizes parameter changes by monitoring acceleration measurement parameters to detect stuck conditions. When the first accelerometer's measurements deviate from expected parameter ranges indicating a mechanical breakdown, the system changes the operational parameters by activating the second accelerometer and applying compensation algorithms. This parameter-based detection and response mechanism enables reliable failure detection and compensation without requiring complex diagnostic hardware.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If accelerometer stuck conditions are not compensated, then device operation continues without interruption, but measurement precision deteriorates

Engineering Contradiction:

Improvedevice operation continuityVSAvoidacceleration measurement accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent implements feedback by continuously monitoring acceleration measurements from the first accelerometer and comparing them against expected operational ranges. When a stuck condition is detected through this feedback mechanism, the system automatically activates compensation using the second accelerometer. This closed-loop feedback approach ensures that measurement precision is maintained without interrupting device operation, as the compensation occurs automatically in response to detected anomalies.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system applies self-service by automatically detecting stuck conditions and compensating for them using the second accelerometer without requiring external intervention or manual calibration. The compensation algorithms are pre-configured and execute automatically when needed, allowing the device to self-correct measurement errors while maintaining continuous operation. This self-service capability resolves the contradiction by ensuring both operational continuity and measurement precision through automated fault tolerance.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12474182B2Accelerometer stuck condition compensation for devices with multiple accelerometers

Publication Date: 2025.11.18 STMICROELECTRONICS INT NV

AI summary

The present disclosure is directed to accelerometer measurement compensation for a device with first and second accelerometers. The first and second accelerometers are included in first and second components, respectively, of the device that are configured to rotate with respect to a hinge. The device detects a stuck condition of the first accelerometer, and compensates acceleration measurements of the first accelerometer by exploiting redundant information from the second accelerometer and applying a runtime calibration of undesired offsets.