BLF recording analysis
Parse BLF recordings and examine timestamped CAN communication in time order, including CAN-FD, J1939, and ISO-TP traffic where present in the supplied data.
Vehicle Data & Measurement
Analyze intermittent behavior in BLF logs
BLF analysis investigates what happened in timestamped bus recordings. I isolate symptom windows, compare message timing and decoded signals, and build a traceable event timeline across failing and reference runs. Findings distinguish observed communication from possible explanations.
Discuss BLF AnalysisProblems I can investigate
Find the behavior behind the symptom
- 01
Large measurement files
Measurement size or volume makes interactive inspection and processing impractical. I can focus processing on relevant CAN communication, signals, and time ranges.
- 02
Intermittent vehicle behavior
A vehicle symptom occurs irregularly and requires evidence across recordings and logs. Analysis can compare observed communication and decoded signal behavior against the supplied problem description.
- 03
Repetitive manual analysis
Engineers repeatedly perform the same data preparation and interpretation steps. Repeatable processing can reduce manual preparation and make findings easier to review.
What I can help with
Focused engineering work in Vehicle Data & Measurement
DBC-based CAN decoding
Use a DBC to decode CAN frames and signals into engineering values, then document interpretation notes and relevant signal behavior.
Focused signal correlation
Compare decoded signals and communication events across recordings to support anomaly investigation and cautious interpretation of intermittent behavior.
Repeatable data processing
Create a repeatable converter or processing utility for automotive data formats, with analysis workflows that can be applied to recurring recordings.
Tool-oriented analysis support
Work from recordings and analysis context associated with Vector CANalyzer or CANoe, while keeping the resulting findings and utilities focused on the defined engineering question.
What to send
Start with the evidence you already have
BLF recording
Provide the relevant BLF recording or recordings containing the vehicle behavior, CAN communication, or measurement interval to investigate.
DBC
Provide the DBC used to define the CAN messages and signals that should be decoded.
Problem description
Describe the observed symptoms, context, reproduction steps, and expected behavior so the analysis can remain focused.
How the analysis works
From recorded data to engineering findings
- 01
Scope the investigation
Review the problem description, recordings, and DBC to identify the relevant communication, signals, and comparison points.
- 02
Parse and decode the data
Read the BLF recording, apply the supplied DBC, and produce usable CAN frames and signal values for analysis.
- 03
Investigate the evidence
Examine communication and signal behavior across the available recordings, looking for patterns, differences, and evidence relevant to the symptom.
- 04
Automate repeatable steps
Where the same preparation or evaluation is repeated, implement a focused data converter or processing utility for consistent execution.
- 05
Document findings
Summarize the analyzed evidence, decoding results, interpretation notes, and remaining uncertainty in a practical engineering format.
What you receive
Deliverables matched to the investigation
Engineering analysis
A documented technical analysis with evidence, findings, relevant signal or communication observations, and clearly stated limits of interpretation.
CAN decoding results
Decoded CAN frames, signals, and interpretation notes based on the supplied DBC and BLF recording.
Data converter
A repeatable utility that transforms automotive data formats or performs defined preparation steps for recurring analysis.
Technologies & formats
Automotive data and analysis environments
- BLF
Binary Logging Format
A Vector binary container for timestamped bus communication.
- CAN
Controller Area Network
A priority-based broadcast bus used for in-vehicle control communication.
- DBC
CAN Database
A text format describing CAN messages, signals, nodes, scaling, and metadata.
- CANalyzer
Vector CANalyzer
A Vector environment for recording and analyzing vehicle-network communication.
- CANoe
Vector CANoe
A development, simulation, test, and analysis environment for vehicle networks.
- CAN-FD
CAN Flexible Data-rate
An extension of CAN with larger payloads and a faster data phase.
- J1939
SAE J1939
A higher-layer vehicle network protocol suite using CAN, common in heavy vehicles.
- ISO-TP
ISO 15765-2 Transport Protocol
A segmented transport protocol for messages carried over CAN.
- python-can
python-can
A Python library providing a common API for CAN interfaces and messages.
- cantools
cantools
A Python package for parsing CAN databases and encoding or decoding messages.
- ASC
ASCII Log Format
A human-readable Vector format for timestamped bus events.
- UDS
Unified Diagnostic Services
ISO 14229 diagnostic services for communicating with vehicle ECUs.
- CAPL
Communication Access Programming Language
Vector event-driven language for network simulation, testing, and automation.
FAQ
Practical questions before an investigation
- How does BLF analysis differ from decoding or conversion?
- Conversion changes the recording format, and decoding translates payloads using definitions such as a DBC. Analysis uses those results to answer an engineering question, such as which communication changed before an intermittent symptom. A useful report links each finding to its recording and time interval.
- What is required to start a BLF analysis?
- The minimum inputs are a BLF recording, the relevant DBC, and a problem description covering the symptom, context, reproduction steps, and expected behavior.
- Can intermittent behavior be analyzed from one recording?
- One recording may provide useful evidence, but comparisons across recordings can make irregular behavior easier to assess. Conclusions remain limited to the supplied data.
- Can the analysis reduce repeated manual work?
- Yes. Repeated preparation or evaluation steps can be captured in a focused data converter or processing utility when the required inputs and output are defined.
- Can existing CANalyzer or CANoe data be used?
- Yes, recordings and analysis context associated with CANalyzer or CANoe can be used when they include the BLF, DBC, and problem information needed for the defined investigation.
Discuss the evidence
Discuss BLF Analysis
Provide the BLF recording, DBC, and problem description. I will assess the data, confirm the analysis focus, and define the smallest useful engineering output.