Digital License Plate Power States for Battery Life Prediction
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Solution Overview
Problem
Digital license plates require significant electrical power to operate, which is a challenge especially when the vehicle is turned off or in varying thermal and environmental conditions, affecting battery life and operational efficiency.
Innovation Solution
A power system for digital license plates that includes a sensor, storage memory, and a battery status monitor with an analog to digital converter (ADC) to determine battery lifetime, allowing for state transitions based on vehicle voltage, motion, wireless connection status, and real-time clock information, and providing battery health assessments using external temperature data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital license plate operates continuously with full power, then display quality and communication capabilities are maintained, but battery life is significantly reduced
Solution Approach 1:
The system dynamically transitions between multiple operational states (off, sleep, wake, semi-wake) based on environmental conditions, vehicle status, and communication requirements. This dynamic state management allows the display and processing units to adjust their power consumption levels while maintaining display quality when needed, thereby extending battery life without sacrificing reliability.
Solution Approach 2:
The system changes operational parameters such as CPU frequency, display refresh rate, and communication activity based on the current state. By adjusting these parameters dynamically, the system maintains adequate display quality and communication capability while optimizing power consumption to extend battery operation.
2Use of energy by moving object
If digital license plate enters low-power states to extend battery life, then power consumption is reduced, but operational responsiveness and communication capability are degraded
Solution Approach 1:
The system performs preliminary actions by pre-loading necessary data into memory during wake states, so that when transitioning to sleep or semi-wake states, the display can quickly resume operation without significant delay. This preliminary data preparation maintains operational responsiveness while allowing extended periods in low-power states.
Solution Approach 2:
The system implements periodic wake cycles where the digital license plate briefly transitions to a wake state to update display content, check communication status, and recharge the battery, then returns to sleep or semi-wake states. This periodic activation maintains operational responsiveness while minimizing overall power consumption.
3Duration of action of moving object
If digital license plate uses multiple operational states, then battery life is extended through power management, but system complexity increases
Solution Approach 1:
The system segments power management into distinct operational states (off, sleep, wake, semi-wake) with clearly defined characteristics and transition conditions. Each state has specific power consumption levels and operational capabilities, making the complex power management system more manageable and easier to implement through modular state machine architecture.
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
This solution optimizes battery life by managing power states and determining battery health, ensuring extended operation and reduced power consumption, even when the vehicle is off, while maintaining effective communication and data transfer capabilities.
Implementation Method 1
an analog to digital converter (ADC) connected to a battery to provide status data to a processor
Data Source
AI summary
A power system for a digital license plate includes a sensor, storage memory, and a battery status monitor operable only during operation of the digital license plate. The battery status monitor includes an analog to digital converter (ADC) connected to a battery to provide status data to a processor in the digital license plate, with status data being stored in the storage memory. A determination of battery lifetime being made at least in part using the status data and input from the sensor. In one embodiment status data can include external temperature.