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One of the main challenges for OEMs to reduce tailpipe emissions is to meet emissions regulation at minimum costs, keeping the vehicle at affordable price to the final customer. Starting in January 2022, all vehicles sold in Brazil will need to comply with PROCONVE L7 (PL7) emissions regulation. PL7 imposes more stringent emissions limits and new procedures to be followed such as the NMOG (Non-Methane Organic Gases) determination. This paper details the NMOG calculation with ozone formation potential corrections. The PL7 NMOG + NOx emissions limit is one of the biggest challenges when running tests with EHR fuel (reference hydrous ethanol) mainly due to aldehydes and unburned ethanol generation prior to engine warmup. The majority of NMOG is generated during the cold phase of ABNT NBR 6601 emissions cycle. This paper aims to detail potential actions to reduce NMOG and meet the PL7 emissions limit when running a light passenger vehicle with low displacement PFI (Port Fuel Injection), normally aspirated, three cylinders engine and fueled with EHR fuel. The emissions tests were run at Ford Tatuí Development Center.

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