Mobile Device Water Detection Logic for On-Board State Accuracy
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Solution Overview
Problem
Conventional mobile devices face inefficiencies in processing accuracy when detecting water and determining if they are on-board a vehicle, leading to potential erroneous state determinations.
Innovation Solution
A mobile device equipped with a first sensor to detect water and a second sensor to determine on-board status, with a controller managing processing to avoid on-board determination when in water and enabling it when not in water, using sensors like touch screens and acceleration sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the device executes processing to determine on-board state using acceleration sensor data, then the on-board detection capability is improved, but erroneous determination occurs when the device is in water
Solution Approach 1:
The controller performs water detection using the first sensor (touch sensor or barometer) before executing on-board state determination. When water is detected, the controller prohibits the on-board determination processing, thereby preventing erroneous determinations caused by water-induced acceleration patterns
Solution Approach 2:
The patent introduces water detection as an intermediary condition that mediates between acceleration sensor data and on-board state determination. The water detection result acts as a gatekeeper that enables or disables the on-board determination processing based on the detected environment
2Measurement precision
If the device uses multiple sensors for detection, then the detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions: water detection, on-board state determination, and conditional control logic. By making the controller multi-functional, the patent avoids adding separate dedicated processing units for each function, thereby managing complexity while maintaining detection accuracy
Solution Approach 2:
The system performs water detection as a preliminary step before on-board determination. This sequential approach allows the use of simple, low-cost sensors (touch sensor or barometer) for water detection while reserving more complex acceleration sensor processing only for appropriate conditions, thereby managing overall system complexity
Data Source
AI summary
A mobile device comprises a first sensor configured to acquire information for determining whether the device is in the water, a second sensor configured to acquire information for determining whether the device is in a state of being on-board, and at least one controller configured to perform control not to execute processing to determine whether the device is in the state of being on-board when the device is determined to be in the water, and to perform control to execute the processing to determine whether the device is in the state of being on-board when the device is not determined to be in the water.