BMS CAN Analyzer Skill#

A specialized skill for parsing automotive BMS (Battery Management System) BLF files and extracting time series data for specific signals using DBC definitions.

When to Use#

✅ USE this skill when:

• "Extract voltage signal from my BLF file"
• "Get temperature readings over time from CAN log"
• "Parse BMS data using my DBC file"
• "Show SOC time series from automotive log"
• "Analyze specific CAN signal from BLF recording"

Requirements#

• BLF (Binary Logging Format) file containing CAN messages
• DBC (Database CAN) file with signal definitions
• Signal name to extract (must match DBC definition)

Commands#

Extract Single Signal Time Series#

bash

# Basic usage
bms-can-analyzer --blf-file path/to/log.blf --dbc-file path/to/definitions.dbc --signal-name "Cell_Voltage_1"

# With output format
bms-can-analyzer --blf-file log.blf --dbc-file defs.dbc --signal-name "Pack_Temperature" --output-format json

# Save to file
bms-can-analyzer --blf-file log.blf --dbc-file defs.dbc --signal-name "SOC" --output-file soc_data.csv

Extract Multiple Signals#

bash

# Comma-separated signal names
bms-can-analyzer --blf-file log.blf --dbc-file defs.dbc --signal-name "Cell_Voltage_1,Cell_Voltage_2,Cell_Temp_1"

Supported Output Formats#

• csv - Comma-separated values (default)
• json - JSON array with timestamp and value pairs
• text - Simple text format with timestamp and value

Signal Name Requirements#

Signal names must exactly match those defined in your DBC file. Common BMS signal examples:

• Cell_Voltage_1, Cell_Voltage_2, ..., Cell_Voltage_N
• Cell_Temperature_1, Cell_Temperature_2, ..., Cell_Temperature_N
• Pack_Voltage, Pack_Current, Pack_Temperature
• State_of_Charge, State_of_Health
• Max_Cell_Voltage, Min_Cell_Voltage
• Max_Cell_Temp, Min_Cell_Temp

Error Handling#

• File not found: Check BLF and DBC file paths
• Signal not found: Verify signal name matches DBC definition exactly
• Corrupted BLF: File may be incomplete or damaged
• Invalid DBC: DBC syntax errors will prevent parsing

Dependencies#

This skill requires:

• Python 3.7+
• python-can library
• cantools library
• blf library (for BLF parsing)

The skill will automatically install these dependencies if not present.