WORK PACKAGE 1 Definition of Targets and final verification
The objective of work package 1 is based on the integrated safety systems specified in the project to prepare a project briefing on previous research on accident scenarios suitable for testing integrated safety systems and establish scenario definitions based on existing accident databases. For the test scenarios derived from these results WP 1 will establish assessment criteria and test protocol as well as develop verification procedures for the different test procedures.
Accident Analysis
The aim of the accident analysis was to define casualty relevant accident scenarios which currently result in the greatest injury outcome, measured by a combination of casualty severity and casualty frequency. The calculation was performed using weighting factors in the following formula: Number of slightly injured road users x 0.011 + Number of seriously injured road users x 0.11 + Number of fatalities x 1.
The result from national accident data showed that “Accidents in longitudinal traffic with multiple vehicles involved” was the most relevant scenario according to the specified criterion (see figure below).
The first results (see downloads/public deliverables) are published in Deliverable 1.1 including a briefing on previous projects. From the detailed analysis results, published in Deliverable 1.2, a test program of 56 test were derived from four accident scenarios; rear-end, intersection, oncoming and cut-in (see WP 4 for further details).
Focus on rear-end scenarios
Due to the complexity of active safety system testing the project is now focusing primarily on the rear-end scenarios which include three major sub groups;
- A1: Slower lead vehicle
- A2: Decelerating lead vehicle (until stopped)
- A3: Stopped lead vehicle
Each of these subgroups include different test set-ups concerning; driving speeds (urban or motorway), braking (normal driving or emergency braking), offset (no or 50%) and driver reactions (no reaction, slow reaction or fast reaction). The full test matrix can be found in Deliverable 4.1 pp. 17-21.
| A1: Slower lead vehicle The lead vehicle (TV) is moving at constant slower speed than the subject vehicle (speeds in km/h). A1A: 50TV/10SV – no offset A1B: 50TV/10SV – 50% offset A1C: 100TV/20SV – no offset |
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| A2: Decelerating lead vehicle The lead vehicle (TV) is decelerating until stopped (speeds in km/h). A2A: 50TV/50SV – TV normal driving A2B: 50TV/50SV – TV emergency braking A2C: 80TV/80SV – TV normal driving A2D: 80TV/80SV – TV emergency braking |
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| A3: Stopped lead vehicle The lead vehicle (TV) is stopped (speeds in km/h). A1A: 50TV/0SV – no offset A1B: 50TV/0SV – 50% offset A1C: 80TV/0SV – no offset |
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There are three on-going task in work package 1 which are described briefly below.
Integrated Assessment
Develop methodology to assess system performance during pre-crash and crash phases with a focus on a technical assessment of system performance (not effectiveness on the road).
Validation and Verification
Investigate repeatability (quantify the variability in result when the same test is repeated multiple times) and reproducibility (quantify the variability of same test at different test houses) to make sure that the final procedure (single test or small number of tests) should show reliable and robust results.
Documentation of Test Procedures
To document the developed test procedures in an consistent with existing ECE regulations.