OBD Power Management for Automotive Video Recorders
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Solution Overview
Problem
Existing automotive systems face challenges in efficiently managing power distribution to video event recorders, leading to battery drain and system overload, as current methods either continuously consume power or disconnect during ignition off, without a practical solution that adapts to vehicle models and power availability.
Innovation Solution
The integration of a power management system that couples video event recorders to a vehicle's power supply via the on-board diagnostics (OBD) system, using a power management module to detect vehicle use states through voltage, motion, or data traffic, thereby regulating power supply to conserve battery life and prevent overconsumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video event recorders are connected to the electrical power supply via a hardwire or direct unswitched connection, then the video system can capture video images continuously even when the ignition key is removed, but the energy consumed is non-negligible and can completely drain the automobile battery in a short period
Solution Approach 1:
The system dynamically switches between two operational states: a first state where the video recorder is fully powered and operational, and a second state where it enters sleep mode with minimal power consumption. The controller transitions between these states based on detected vehicle conditions (ignition status, motion detection, data bus activity), allowing the system to adapt its power consumption profile to match actual recording needs while preserving battery life during extended parked periods
Solution Approach 2:
The system changes operational parameters by switching the power state of the video recorder. When in the first state, the recorder receives full power for normal operation. When transitioning to the second state, power is reduced to minimal levels sufficient only for maintaining basic functionality or entering sleep mode. This parameter change allows the system to balance recording availability with power conservation
2Use of energy by moving object
If video event recorders are coupled to the power supply by the ignition switch, then power consumption is reduced when the switch is off, but the video event recorder remains without power at times when it would be desirable to have power
Solution Approach 1:
The system dynamically determines vehicle use states by monitoring multiple parameters including ignition status, motion sensor data, and data bus traffic patterns. Based on this dynamic assessment, the controller intelligently activates or deactivates power to the video recorder, allowing it to remain powered during periods when the vehicle appears to be in use even if the ignition is off, while still conserving power during extended parked periods
Solution Approach 2:
The system employs feedback mechanisms by continuously monitoring vehicle conditions (ignition state, motion detection, data bus activity) and using this information to control power delivery to the video recorder. The controller receives feedback from various sensors and system states, then adjusts power delivery accordingly, ensuring the recorder is powered when needed while minimizing consumption when the vehicle is truly parked
3Ease of operation
If a video event recorder is provided with coupling to a power supply via an independent switch, then power can be controlled manually, but such manual type switch couplings suffer from a great number of inconveniences and difficulties
Solution Approach 1:
The system performs self-service by automatically determining vehicle use states and controlling power delivery to the video recorder without requiring manual user intervention. The controller monitors vehicle conditions (ignition status, motion, data bus activity) and autonomously decides when to power the recorder on or off, eliminating the need for manual switches while providing intelligent power management
Solution Approach 2:
The system achieves universality by integrating multiple functions into a single automated controller that can interpret various vehicle states (ignition status, motion detection, data bus traffic) and respond appropriately with power control. This multi-functional approach replaces the need for separate manual switches and complex wiring while providing adaptive power management that works across different vehicle models and operating conditions
Data Source
AI summary
Video event recorders are coupled to a vehicle power source via an on-board diagnostic system including its power bus, data bus, and scanner port connector. Video event recorders are provided with a power input arranged in conjunction with a standard ODBII type “D” connector. Systems further include an extension cable between the connection and the vehicle event record to accommodate mounting needs associated with each. In advanced versions, both OBD power and data networks are coupled to the vehicle event recorded such that data relating to vehicle diagnostic systems can be captured in a triggered event along with video data. In addition, some versions are provided with special detection mechanism to determine the use state of a vehicle and adjust application of power accordingly. Thus an “in-use” detector is coupled to the vehicle and/or OBD systems to provide feedback which helps to conserve power and regulate the power connections.