EDR Event Data Recorder: Vehicle event data recording system
KopherBit EDR (Event Data Recorder) is a vehicle event data recording subsystem that integrates data sources such as Crash Sensor, Airbag ECU, and seat occupancy sensors to record key vehicle status when an accident occurs to assist in post-event reconstruction and regulatory compliance.
Summary
EDR (Event Data Recorder) is an optional function provided by KopherBit on KCU GEN2 (Phase B), which automatically records key vehicle status and sensor data when vehicle events (such as collisions) occur.EDR integrates data sources such as impact sensors, Airbag ECUs, and seat occupancy sensors to assist in accident reconstruction analysis, insurance liability determination, and regulatory compliance (such as GB 39732, UN R160, 49 CFR Part 563).
Technical Role
EDR plays the role of a passive safety data black box in the vehicle E/E architecture: it continuously buffers key signals in a normal cycle. After an event is triggered, the data for a period of time before and after the trigger is frozen and saved for later reading.The EDR subsystem is executed by the KCU GEN2 main processor and is matched with the signal inputs of the vehicle’s existing impact sensors and airbag ECU.
Architecture
| Mods | Characters |
|---|---|
| Crash Sensor | Crash sensor provides acceleration and collision trigger signals. |
| Airbag ECU | Airbag control unit, provides airbag activation status. |
| Seat Occupancy Sensor | Seat occupancy sensor, records the passenger position information at the moment of the event. |
| KCU GEN2 (EDR Logic) | Execute circular buffering, event triggering logic and data freezing; obtain signals from the above sensors/ECU through CAN/CAN FD. |
| Storage | Non-volatile memory (Flash segment), saves event frozen data for later reading. |
| Diagnostic Service | Read event data through the UDS (ISO 14229) service. |
Key Capabilities
- Integrate multi-source signals such as Crash Sensor / Airbag ECU / Seat Occupancy.
- Circular buffering and frozen storage of key time windows before and after the event.
- Read via UDS diagnostic service, compatible with existing diagnostic tool processes.
- Built-in KCU GEN2 (Phase B) is an optional function, no need to add a separate ECU.
Engineering Inputs Required
| Input | Purpose |
|---|---|
| Signal list (including DBC / signal definition) | Determine the vehicle status signals to be recorded (speed, brake, steering wheel angle, throttle, etc.). |
| Event triggering conditions | Define what signal changes (such as Airbag Deploy signal, acceleration threshold) are regarded as events. |
| Buffering time window | The storage time before and after the event (common: 5 seconds before / 1 second after). |
| Regulatory objectives | Corresponding EDR regulations (such as GB 39732, UN R160, 49 CFR Part 563) to determine mandatory data items. |
| Read process | UDS Service ID and SecurityAccess level specification. |
How KopherBit Supports This
- Hardware platform: KCU GEN2 (Phase B) main control board, no need to add a new ECU.
- EDR Application Layer: Implement circular buffering and event management on KopherSAR + RTE.
- Diagnostic integration: Read event data through KopherUDS host computer, in line with UDS / DCM / DEM process.
- Verification: KCU Gen2 Testbench provides event triggering and data integrity verification capabilities.
FAQ
What is the difference between EDR and Airbag ECU?
The Airbag ECU is responsible for instantly detecting the impact and activating the airbag; the EDR is responsible for “recording the vehicle status before and after the incident” for subsequent analysis.EDR does not replace Airbag functionality but serves as a downstream recorder of its data.
How long is EDR data retained?
Determined by the event memory configuration at design time.Generally, it supports single or multiple event loop coverage, and the common configuration is to retain the latest 1~3 event data; the specific adjustment is based on customer regulations and storage space requirements.
Will EDR affect the vehicle’s main control function?
EDR is executed as a partition or low-priority task on KCU GEN2, and is usually only responsible for circular buffering; the writing action after the event is triggered is one-time and will not affect the immediacy of the main control loop.
What tools are needed to read EDR data?
Diagnostic tools that comply with the UDS/SecurityAccess process are required.The KopherUDS host computer of KopherBit supports EDR data reading and analysis.
Is EDR built into all KCU GEN2?
EDR is an optional feature of KCU GEN2 (Phase B).If the customer does not need it, it can be disabled without any extra cost.
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