In-Vehicle Sensor Data Synchronization Under LAN Access Delays
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Solution Overview
Problem
Intra-vehicle communication systems face challenges with transmission delays due to access control, leading to unsynchronized data from multiple sensors, which can result in incorrect recognition of objects detected by different sensors.
Innovation Solution
The system introduces synthesis information added to data headers to synchronize multiple pieces of information by including delay and timing information, allowing reception devices to combine data accurately despite access control delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If LAN technology is used for intra-vehicle communication, then weight reduction is achieved by eliminating dedicated cables, but transmission delays occur due to access control
Solution Approach 1:
The patent applies preliminary action by pre-assigning transmission rights to sensors based on their detection timing. The control device determines which sensor should transmit first before the actual transmission occurs, eliminating the need for access control arbitration during data transmission. This pre-planned transmission sequence ensures that multiple sensors can transmit data simultaneously without collisions or delays.
2Stability of the object's composition
If access control is performed in LAN system, then data transmission order is managed, but synchronization of multiple information pieces is compromised
Solution Approach 1:
The patent implements feedback by having the control device monitor transmission timing and detect synchronization states of multiple sensors. Based on this feedback, the control device dynamically adjusts transmission rights assignment to ensure that detection results from multiple sensors are properly synchronized. The system continuously monitors and corrects transmission timing to maintain synchronization reliability.
3Quantity of substance
If multiple sensors transmit data simultaneously, then information completeness is improved, but transmission conflicts occur due to access control
Solution Approach 1:
The control device serves as an intermediary that manages transmission rights among multiple sensors. Instead of allowing direct simultaneous transmission that would cause conflicts, or sequential transmission that reduces efficiency, the control device mediates by assigning transmission rights based on detection timing. This intermediary management enables multiple sensors to transmit their data completely without conflicts while maintaining high transmission efficiency.
Data Source
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AI summary
An in-vehicle communication device (100) includes a communication section (120) and a control section (150). The communication section (120) performs wireless communication with a first zone control node (20) disposed in a first zone among a plurality of divided zones in a vehicle and transmits first data to a reception device via the first zone control node (20). The control section (150) adds, to the first data, synthesis information to be used in a case where the reception device combines the first data and another piece of data.