다양한 배기 규제 운전 모드 상에서 가솔린 하이브리드 차량의 전기 가열식 촉매 성능 실험 연구

초록

This study investigated the performance of an electrically heated catalyst(EHC) system composed of an electrically heated three-way catalyst(EH TWC) and a catalyzed gasoline particulate filter(EH-cGPF) in a mid-size hybrid vehicle under real driving conditions. The EHC was designed to enable rapid catalyst activation during cold start by applying a 1.5 kW electric heater for 40 seconds before and 20 seconds after engine start. Experiments were conducted using a chassis dynamometer under the Worldwide Harmonized Light Vehicles Test Cycle(WLTC) and the Urban Dynamometer Driving Schedule(UDDS) to evaluate emissions characteristics. In the WLTC, the EHC system achieved 200 °C in approximately 12 seconds—38 seconds faster than the non-heated case—resulting in a 37.5 % reduction in CO and a 17.4 % reduction in THC emissions during the first 200 seconds. Under the UDDS cycle, the EHC-equipped vehicle demonstrated CO emissions of 0.074 g/km, significantly below the U.S. Tier 3 limit of 0.621 g/km, while NMOG+NOx slightly exceeded the standard. These results confirm that the direct-heating EHC system significantly improves cold-start emission control and demonstrates compliance with both Euro 7 and U.S. Tier 3 regulations when applied to hybrid vehicles.

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