Modular Vehicle Sensor Hub With Selective I2C Power Control
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Solution Overview
Problem
Existing vehicle telematics systems lack a cohesive, low-power, modular sensor hub that efficiently integrates with a vehicle's dashcam to manage a diverse array of internal and external sensors, providing enhanced security and operational awareness while maintaining minimal power consumption.
Innovation Solution
A modular, low-power sensor hub system, the 'Nexar Node,' is designed to integrate deeply with a vehicle's dashcam. It features a central hub with a low-power MCU, BLE communication, and integrated solar panels for power management. The hub supports various internal sensors and externally connected I2C sensor modules, enabling efficient data exchange and power conservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diverse array of internal and external sensors is integrated into the vehicle monitoring system, then the system's functionality and security capabilities are enhanced, but the power consumption increases
Solution Approach 1:
The system divides the sensor network into multiple independent I2C sensor modules that can be individually managed and powered. Each sensor module operates independently but communicates through the standardized I2C interface, allowing selective activation based on monitoring needs rather than continuously powering all sensors.
Solution Approach 2:
The patent implements a universal I2C communication interface that works with diverse sensor types (accelerometers, gyroscopes, temperature sensors, etc.). This single standardized protocol enables the hub to manage multiple different sensor modules through one unified communication channel, reducing the need for multiple dedicated communication circuits and lowering overall power consumption.
2Extent of automation
If a central hub manages and coordinates data from multiple sensor modules, then the system's intelligence and coordination improve, but the device complexity increases
Solution Approach 1:
The hub serves as an intermediary device between the diverse I2C sensor modules and the Bluetooth Low Energy communication interface. It collects data from multiple sensors, processes and coordinates the information, then transmits consolidated data via BLE to the smartphone or cloud platform, simplifying the overall system architecture by centralizing data aggregation and communication functions.
Solution Approach 2:
The hub autonomously manages power distribution to sensor modules, coordinates data collection timing, and handles Bluetooth Low Energy communication without requiring external control. This self-service capability reduces system complexity by eliminating the need for external microcontrollers or additional coordination hardware.
3Duration of action of stationary object
If the hub operates with extended unattended operation capability using solar charging, then the system's autonomy and duration of action improve, but the device complexity and power management requirements increase
Solution Approach 1:
The solar charging system operates periodically, harvesting energy during daylight hours and storing it in the rechargeable battery for nighttime or cloudy period operation. This periodic charging cycle extends the hub's unattended operation duration without requiring a complex continuous power management system, as the charging occurs in regular intervals rather than requiring constant monitoring and adjustment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The Nexar Node system provides a cost-effective, user-friendly, and expandable solution that enhances the capabilities of a standard dashcam by transforming it into the command center of a versatile low-power sensory network, offering improved security, operational awareness, and adaptability to diverse use cases.
Implementation Method 1
integrated solar panels designed for low-light operation to sustain the hub itself
Data Source
AI summary
A modular sensor for a vehicle, including a central hub including a low-power MCU with BLE communication capability, a power manager including a rechargeable battery and a charger IC, at least one integrated sensor selected from among an accelerometer, a microphone, a reed switch and a smoke detector IC, and at least one external sensor interface connector configured for I2C communication with, and providing power to, one or more external sensor modules, wherein the MCU receives event data from the at least one integrated sensor or from an external sensor module connected via the I2C communication, selectively manages power supplied to the one or more external sensor modules via the external sensor interface connector, and transmits an alert or data to a paired main vehicle dashcam via BLE based on the event data, the main vehicle dashcam configured to orchestrate responses based on the alert or the data.