Vehicle Camera Event Capture Using CAN Bus Triggers
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Solution Overview
Problem
Existing dash cameras do not effectively integrate with vehicle communication systems to capture and transmit event images in response to specific vehicle conditions, such as changes in speed or unauthorized access, in a manner that is efficient and user-controlled.
Innovation Solution
A vehicle camera system that utilizes a CAN bus to receive trigger messages and capture event images, which are then wirelessly transmitted to a user device over cellular or wireless local area networks, allowing for selective transmission based on message categories and user-defined criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the camera continuously captures and transmits all vehicle events, then the user receives complete information about vehicle conditions, but data usage increases and unnecessary transmissions occur
Solution Approach 1:
The system applies different transmission qualities to different event types. Critical events (accidents, unauthorized access) trigger immediate high-priority transmissions with complete image data, while routine events (normal driving conditions) trigger lower-priority transmissions with reduced data. This local differentiation of transmission quality based on event significance resolves the contradiction between information completeness and data usage efficiency.
Solution Approach 2:
The system changes transmission parameters (image resolution, transmission frequency, data compression level) based on the type of vehicle event detected. For example, accident events trigger high-resolution immediate transmissions, while routine events trigger lower-resolution delayed transmissions. This dynamic parameter adjustment allows the system to maintain information quality for important events while reducing data usage for routine events.
2Loss of time
If the camera transmits all event images immediately, then the user receives timely notifications, but unnecessary transmissions occur consuming bandwidth and energy
Solution Approach 1:
The system performs preliminary classification of events before transmission. The processing logic analyzes the triggered event type and determines the appropriate transmission strategy in advance - whether to transmit immediately with full data, delay transmission, or reduce data quality. This preliminary action prevents unnecessary immediate transmissions while ensuring critical events are notified without delay.
Solution Approach 2:
The system implements periodic transmission intervals for different event types. Routine events may be transmitted at scheduled intervals rather than immediately, while critical events trigger immediate transmissions. This periodic action pattern reduces overall transmission frequency and energy consumption while maintaining timely notification for important events.
3Productivity
If the camera integrates with the CAN bus to receive trigger messages, then event capture becomes automated and efficient, but the device complexity increases
Solution Approach 1:
The camera system is designed with multi-functionality to interface with the vehicle's existing CAN bus communication protocol. The processing logic can interpret multiple types of CAN messages (acceleration, braking, collision detection, unauthorized access) and trigger appropriate capture and transmission actions. This universal interface approach allows efficient automated event capture without requiring separate dedicated sensors for each event type, thereby limiting the increase in device complexity.
Data Source
AI summary
A camera for a vehicle includes an image sensor and processing logic. The image sensor captures event images based on one or more messages generated by the vehicle communication bus.