EPID Wake Trigger via Engine Vibration Detection
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Solution Overview
Problem
Electronic plug-in devices (EPIDs) connected to vehicle OBD-II ports rely on functional messages for transitioning from a sleep state to a wake state, making them susceptible to spoofing attacks and inefficient in power consumption, as they consume substantial power in the wake state and minimal power in the sleep state without a reliable trigger.
Innovation Solution
Incorporating an accelerometer and processor in the EPID to detect engine operation vibrations, allowing the device to autonomously transition between sleep and wake states without relying on functional messages, thereby conserving power and reducing the risk of spoofing attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functional messages are delivered to EPID through OBD-II port to trigger wake state, then EPID can transition from sleep to wake state, but EPID becomes susceptible to spoofing attacks and unauthorized message delivery
Solution Approach 1:
The patent extracts the wake trigger function from the functional messages received through OBD-II port and implements it locally using an accelerometer sensor. The accelerometer detects engine vibrations directly, eliminating the need to rely on potentially spoofed functional messages for wake state transition, thus maintaining security while ensuring reliable operation.
Solution Approach 2:
The patent introduces an accelerometer as an intermediary device that mediates between the engine operation and the EPID wake state transition. Instead of using functional messages as the direct trigger, the accelerometer serves as an intermediate sensor that detects engine vibrations and generates local wake triggers, preventing unauthorized message delivery while ensuring proper wake state transitions.
2Productivity
If EPID remains in wake state to ensure functionality, then EPID can respond to engine operations, but power consumption increases substantially
Solution Approach 1:
The patent implements periodic action by transitioning the EPID between sleep and wake states based on actual engine operation needs. The accelerometer continuously monitors engine vibrations and triggers wake state only when engine operation is detected, allowing the EPID to remain in low-power sleep state during non-operational periods while maintaining responsiveness when needed.
Solution Approach 2:
The patent enables the EPID to self-regulate its power consumption by using the accelerometer to autonomously determine when to transition from sleep to wake state. The system serves itself by detecting engine vibrations and automatically activating only when necessary, eliminating the need for continuous wake state and reducing overall power consumption while maintaining productivity.
3Reliability
If EPID uses accelerometer to detect engine vibrations for wake trigger, then security is improved and power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent replaces the electronic/message-based wake trigger system with a mechanical vibration detection system using an accelerometer. Instead of relying on electronic functional messages through OBD-II port, the system uses mechanical vibration detection from engine operation to trigger wake state, improving security and power efficiency while adding a single sensor component.
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 solution enables the EPID to efficiently transition between states based on engine operation vibrations, minimizing power consumption in the sleep state and ensuring functionality in the wake state, while preventing unauthorized message delivery and enhancing security.
Implementation Method 1
The accelerometer is configured to detect vibrations associated with an engine operation and/or vehicle motion. The vibrations associated with the engine operation corresponds to the vibrations produced by the working of a combustion engine
Data Source
AI summary
The present disclosure relates to a system that allows engagement of an electronic plug-in device (EPID) with an on-board diagnostic II (OBD-II) port of a vehicle. The EPID includes an accelerometer and a processor. The accelerometer detects vibrations associated with engine operation. The processor, in communication with the accelerometer, executes instructions to receive an input waveform from the accelerometer. The processor may determine whether the input waveform from the accelerometer is associated with the engine operation. The processor may transition the EPID from a sleep state to a wake state if the input waveform is detected to be associated with the engine operation. In contrast, the processor may transition the EPID from the wake state to the sleep state when the input waveform is not associated with the engine operation.