Dalessi Engineering is the only firm in the canton able to carry out EDR (Event Data Recorder) analyses in an independent and certified manner.
Thanks to the specific training we receive as a Bosch partner, we extrapolate and analyse the data stored in vehicle control units to define the dynamics and causes of road accidents. Our work is especially useful in forensics, where we work closely with investigators.
We are equipped to read any Bosch CDR-compatible ECU, either directly in the vehicle or in the laboratory, where we carry out an analysis of the individual electronic module.
To do this, we use the CDR (Crash Data Retrieval) data access protocol, created
by Bosch, the world leader in this field. This protocol covers an increasing number of vehicles: from 6 July 2022, in fact, according to Regulation 2019/2144 of the European Parliament, all new vehicle type approvals must provide access to EDR data by external operators and no longer only by manufacturers.
The data recorded by an EDR device contains specific information about a short period of time, ranging from about 5 seconds before the accident to about 2 seconds afterwards.
The recording can be triggered by a number of specific factors, such as abrupt deceleration or a marked roll of the vehicle, or the deployment of airbags: the modules that regulate the operation of these safety devices, in fact, store parameters useful for reconstructing collision dynamics.
Depending on the car manufacturer and model, we can have data such as, for example:
- vehicle speed
- engine speed
- accelerator rate
- automatic gearbox shift position
- brake system pressure
- steering input
- seat belts status
- occupancy status, passenger
- passenger classification
- longitudinal and lateral accelerations
- roll angle
We also take care of the extrapolation and analysis of additional data stored in vehicle control units - especially useful in forensics, in close cooperation with investigators - such as GPS and related data (BERLA system).