BS ISO 20530‑1:2020 pdf download.Intelligent transport systems — Information for
emergency service support via personal ITS station.
5 General information This document specifies the general requirements for the accident detection system via P-ITS-S. It contains information on the following:
— accident detection system structure;
— requirements for impact detection;
— accident determination process by accident case (airbag deployed/rollover/stationary).
The accident detection system consists of the UVIP server, which is a part of an in-vehicle system and a P-ITS-S. The role of a P-ITS-S is to gather accident data from the UVIP server, to analyse this data, and send the location of the accident detected to the emergency service centre. The accident detection system implementation method differs according to G-sensor availability within a vehicle. Whether there is an in-vehicle or P-ITS-S G-sensor, impact data is gathered and sent to the P-ITS-S for the further accident determination process. The accident determination process differs according to the accident case (e.g. airbag-deployed, rollover and stationary) as well as the required data. Required data is covered in use case cluster 2. Figure 1 shows the accident detection reference system.
6.2 Use case implementation
6.2.1 UC cluster 1 — Impact detection The P-ITS-S monitors impact data through G-sensor in real-time and checks whether the impact has exceeded a preset threshold. Determining a preset impact threshold is not covered in this document. This use case cluster involves the case where impact is gathered and sent to the P-ITS-S. The role of the P-ITS-S is differed by G-sensor availability within a vehicle.
6.2.1.1 UC 1.1 Impact detection through in-vehicle G-sensor Table 2 defines the use case where impact data from G-sensor within a vehicle is gathered. In this use case, the P-ITS-S which communicates with a UVIP server gathers impact data directly from an in- vehicle G-sensor in DXMessage format. The UVIP client within the P-ITS-S shall receive impact data along with an airbag deployment signal and move on to the further process.
6.2.1.2 UC 1.2 Impact detection through P-ITS-S G-sensor Table 3 defines the use case of using the P-ITS-S acting as an impact gathering entity for an older and low-end vehicle model which does not have an in-vehicle G-sensor. In this use case, if there is a case where impact data exceeds a preset threshold, the P-ITS-S makes a speed and airbag deployment signal data request to the UVIP server and moves on to the accident detection process.BS ISO 20530‑1 pdf download.