The impact of downsizing on fuel consumption and exhaust emissions

The article presents the results of exhaust toxicity and fuel consumption measurements for two vehicles under real-world driving conditions (on-road conditions). The study involved D-segment passenger cars powered by spark-ignition engines with automatic transmissions. The selected vehicles served as an example of downsizing (vehicles with similar performance but different engine design features were chosen for comparison: a naturally aspirated engine and a turbocharged engine with reduced displacement). The tests were conducted over a distance of several dozen kilometers on the streets of Poznań and its surrounding areas, covering various driving characteristics: urban, extra-urban, and highway driving. A mobile exhaust emission testing system, SEMTECH-DS by Sensors Inc., was used to measure the concentration of individual harmful substances in the exhaust gases and fuel consumption.THE IMPACT OF DOWNSIZING ON FUEL CONSUMPTION AND EMISSIONS IN THE EXHAUST
The article contains the results of measurements of exhaust emissions and fuel consumption of vehicles in real conditions of their motion. Research vehicles were passenger cars from the D-segment, driven by petrol engines and equipped with automatic transmission. Tests were performed over a distance of tens of kilometers on the streets of the city of
Poznan, and within, while driving on the sections with different characteristics – urban and extra urban driving and on the highway. For measuring the concentration of various pollutants in the exhaust gases and fuel consumption used to the mobile equipment for testing the toxicity of exhaust SEMTECH-DS from Sensors Inc. (…)

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