Vehicle driving dynamic parameters and specific CO2 emissions used to validate testing under real road conditions

Introduction (problem statement and relevance). In addition to testing on a chassis dynamometer, starting from the Euro-6d level, vehicle testing under real road conditions (RDE) is mandatory. Vehicle driving dynamic parameters such as relative positive acceleration (υ∙ аpos) [95], as well as specific CO2 emissions are used as criteria in the test validation using the moving averaging window method.

The purpose of the study is to compare vehicle driving dynamics on two road routes and assess the suitability of the routes for vehicle testing according to UN Regulation No. 168 based on analysis of dynamic driving parameters.

Methodology and research methods. Review of vehicle driving parameters. Testing of the vehicle developed in FSUE “NAMI” under real road conditions on two routes located in different regions. Processing and analysis of results.

Scientific novelty and results. An overview of development of test driving cycles and scientific approach for evaluating them using dynamic driving parameters is presented. Based on the analysis of dynamic parameters, specific features of vehicle driving on two routes are shown. A multiple difference in the values of dynamic parameters is revealed when driving on different routes due to different road conditions on these routes. It is shown that vehicle driving on RDE routes is characterized by significantly higher accelerations and dynamic driving parameters compared to driving in the NEDC and WLTC driving cycles.

Practical significance. Suitability of RDE routes for testing according to UN Regulation No. 168 is demonstrated. The results are of practical interest to testing laboratories, manufacturers of vehicles, exhaust gas aftertreatment systems, and can also be used in determining government policy in the field of reducing emissions of pollutants by road transport.

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