HV-ECU Motor ECU CAN Frame Data Merging
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Solution Overview
Problem
The efficiency of data communication in existing CAN communication systems is hindered by the separate transmission of synchronization data and calculation data, leading to increased data amounts and potential incomplete data transmission within a control period, especially when data is repeatedly transmitted and received between master and slave nodes.
Innovation Solution
The proposed communication system integrates synchronization data as calculation data within frame data, allowing the second communication apparatus to determine the start of the communication period based on the synchronization ID and execute calculating processes using the included data information, thereby reducing the amount of data transmitted and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission destination slave node information is transmitted separate from calculation processing data, then the slave node can correctly identify and process the data, but the amount of data increases and communication efficiency is lowered
Solution Approach 1:
The patent combines the transmission destination slave node information with the calculation processing data into a single data structure. Instead of sending separate messages for destination identification and calculation data, the system merges these into one unified transmission, reducing the total data volume while ensuring the slave node can still correctly identify and process the intended data through embedded destination identifiers within the combined structure.
2Stability of the object's composition
If data is transmitted repeatedly at a predetermined control period, then the communication between master and slave nodes is maintained, but the transmission and reception may not be completed within the control period when communication efficiency is low
Solution Approach 1:
By merging destination information with calculation data into single transmissions, the patent reduces the number of separate communication operations required within each control period. This consolidation allows the system to maintain the required communication periodicity while ensuring that all necessary data exchanges can be completed within the allotted time frame, preventing transmission timeouts or incomplete data reception.
3Reliability
If the amount of transmitted data is increased to include separate transmission destination information, then the slave node can accurately process data, but the communication bandwidth consumption increases
Solution Approach 1:
The patent merges destination identification information with calculation processing data into a single transmitted data structure. This approach maintains data processing accuracy by including necessary destination identifiers within the combined data, while simultaneously reducing the total data transmission volume compared to sending separate messages for each piece of information.
Solution Approach 2:
The unified data structure serves multiple functions simultaneously: it identifies the transmission destination, carries calculation processing data, and maintains data integrity. This multi-functional design eliminates the need for separate dedicated messages for each purpose, reducing overall bandwidth consumption while preserving all necessary information for accurate slave node processing.
Data Source
AI summary
A data storage processor of an HV-ECU transmits frame data including ID information indicating a kind of data and data information indicating the contents of the data to a motor ECU. When the motor ECU receives the frame data from the HV-ECU, a calculation processor of the motor ECU determines that the data information of the received frame data is data regarding the kind of data indicated by the ID information of the received frame data and executes a predetermined calculating process based on the data information. When the ID information of the frame data received from the HV-ECU is a synchronization ID, a data storage processor of the motor ECU starts a process of transmitting, to the HV-ECU, the frame data to be transmitted within the communication period.