UN ECE-R117 compliant data collection

The new version of the EU directive "UN ECE-R117" introduces new requirements for data collection during tire tests. These requirements are summarized here and solutions are shown regarding the hardware, but also regarding the evaluation, validation and visualization of the data.

Introduction: UN Regulation ECE-R117

UN ECE-R117 Amendment 04 (<Link>) (Regulation No. 117 of the United Nations Economic Commission for Europe, with amendment status 04) sets globally harmonized standards for the assessment of tires in terms of rolling resistance, wet grip and noise emissions. Amendment 04 updates and clarifies the requirements to take into account the increasing demands for environmental compatibility, safety and energy efficiency.
The latest changes include stricter test criteria, extended test methods and additional requirements for modern tire types, especially for use in electric vehicles and vehicles with alternative drives. Manufacturers and test laboratories are faced with the challenge of carrying out these more complex tests with the highest level of accuracy and conformity.  (to the top of the page) (back to top of page)

Data collection requirement

The UN Directive specifies which data and in what quality this data must be recorded. The central point is the recording of the position (GPS/GNSS) with a resolution of 10Hz. The values ​​for the vehicle acceleration in the longitudinal and transverse axes are derived from this position data. The temperature only needs to be documented at the beginning and end of the test (back to top of page)

Available solutions

The requirements can be met with the appropriate data loggers and GNSS/GPS sensors from Avisaro AG. The recorded data met the requirements 'out of the box'. It is easy to use: the data logger is mounted in the vehicle - e.g. in the footwell of the back seat. The GNSS/GPS receiver is mounted in the interior near a window - e.g. in the area of ​​the C-pillar. The power supply is via the vehicle's 12V or 24V electrical system via a DIN standard socket ("vehicle socket / cigarette socket").
The data loggers have a factory calibration with a corresponding certificate on request. Certification according to ISO17025 for approval as a measuring device will be offered soon. 
The data is recorded on a USB memory stick. At the end of the test, the stick is removed and read into a PC in the office. Alternatively, the data can be transmitted wirelessly. This allows the process to be automated. A connection to AWS cloud services ("S3 bucket") will soon be available as an option.
A built-in Acceleration sensor (Inertial Unit 'IMU') records the movement of vehicles, for example.  (back to top of page)
 

Evaluation software and data validation

The ETRTO (European Tyre & Rim Technical Organisation) (<Link to website>) provides a software tool with which the data can be tested for validity. Various parameters are also calculated and displayed. The tool is called "ETRTO ABRASION ET ACCELERATION EVALUATION TOOL" (AET) in version 09/24 (<Link to download software tool>).
This software uses the runtime environment of Mathlab - freely available from "Mathworks" (<Link>). Please note that version R2023b is required for the AET tool (back to top of page)

Visualization of the route

A visual representation of the route allows a quick and good check of the data obtained. It is quickly apparent whether the data set is complete. Gaps - for example due to incorrect installation of the GNSS/GPS receiver or environmental influences - are quickly identified.
The basic version of the tool for displaying the data will soon be available free of charge from Avisaro AG. A suitable link will be published here; the tool is currently only available to selected customers. (back to top of page)

 

Any questions? We're happy to answer them.

The subject of UN Directive ECE-R117 is somewhat complex - but with our experience and products it can be presented well.
Questions? Write or call: info@avisaro.com or +49-511-7809390