Sensor Transmission Device Virtual Unit Bus Data Packet
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Solution Overview
Problem
The existing LIN bus protocol in vehicles is inefficient when not all sensors have data to transmit, leading to unnecessary transmission of empty bytes and increased cycle time, as it requires each sensor to send data in separate frames, wasting bandwidth and time.
Innovation Solution
A method that integrates payload data from multiple sensors into a single bus data packet using a virtual unit approach, where the lengths and positioning of payload data blocks are determined by an assignment rule based on the operating states of sensor transmission devices, reducing signaling complexity and eliminating the need for empty bytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors transmit data in separate dedicated frames using the LIN protocol, then each sensor can reliably transmit its data, but the net data transmission rate drastically worsens when a single user transmits only a small amount of data due to the control data required for each frame
Solution Approach 1:
The patent combines multiple sensors into a virtual unit and merges their payload data into a single shared bus data packet. Instead of each sensor transmitting in separate dedicated frames, the virtual unit consolidates all payload data blocks within one frame structure, eliminating redundant control data and significantly improving the net data transmission rate while maintaining reliable data delivery through the assignment rule that maps payload blocks to specific sensors
2Productivity
If all sensors must send data in each cycle to create a valid frame, then the net data rate is highest when all users have new data, but the net data rate decreases when individual users have no new data to be sent as they must send empty bytes occupying bandwidth unnecessarily or extending cycle time
Solution Approach 1:
The patent introduces dynamic adaptability through the assignment rule that can be updated based on which sensors actually have data to transmit. The virtual unit dynamically adjusts the payload data block assignments and frame structure according to the current operating state of sensors, allowing the system to optimize the net data rate by eliminating empty bytes while maintaining valid frame structure, thus reducing unnecessary bandwidth occupation and cycle time extension
Solution Approach 2:
The patent changes the parameter of frame structure by allowing the payload data field to contain variable-length payload data blocks from only those sensors that have new data. The assignment rule dynamically determines which sensors contribute to the current frame, enabling the system to adapt the frame content to actual data availability rather than requiring fixed participation from all sensors, thereby optimizing transmission efficiency
3Reliability
If each sensor uses a dedicated frame for data transmission, then data assignment is simple and reliable, but the signaling complexity increases and signal overhead increases, reducing the amount of payload data that can be transmitted
Solution Approach 1:
The patent creates a universal frame structure that serves multiple sensors simultaneously through the virtual unit concept. The single bus data packet with its payload data field can accommodate payload data blocks from multiple sensors, making the frame structure multi-functional rather than dedicated to a single sensor. The assignment rule provides a universal mechanism for mapping any sensor's payload data to appropriate blocks within the shared frame, reducing signaling complexity while maintaining reliable data assignment
Data Source
AI summary
A method is described for assigning payload data from a bus data packet to different sensor transmission devices, a bus control device being connected to a data bus of a vehicle designed for the simultaneous transmission of bus data packets (100) between multiple sensor transmission devices and the bus control device. The bus data packets include at least one signaling field and a payload data field having at least two payload data blocks. The method includes a step of reading in a bus data packet and a step of determining an assignment rule based on an action list. The action list includes multiple combinations in each case of one of multiple possible operating states for each sensor transmission device which uses the data bus.