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 Influence of cold-start time reduction on scooter emissions and fuel consumption over WMTC cycle.
Tác giả hoặc Nhóm tác giả: Cho-Yu Lee, Dai-Qui Vo
Nơi đăng: Energy (SCIE, Q1), H-Index: 274, IF: 9.4; Số: 231;Từ->đến trang: 12-24;Năm: 2021
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
Scooters with small displacement air-cooled engine which is technically mature and low cost have been widely used nowadays. Compared to water-cooled engines, the air-cooled engines have nothing like thermostat to speed up warm-up duration. The crankshaft of the air-cooled engine drives the cooling fan coaxially. Thus it starts cooling even at the cold start, which extends the warm-up duration. It harms THC emissions. Many studies have shown that speeding up engine warming up can reduce THC emissions. For a 2-wheel motorcycle of category L3e, in the face of the EURO5 emission standard that was implemented in 2020, the current THC emission of 380 mg/km will be revised down to 100 mg/km, with a reduction ratio of 73.68%, which is the most significant reduction among all polluting gases. Thus, the purpose of this study is to develop a low-cost double-layer fan cover with a function of automatic open and shut. It was installed in a commercially available motorcycle with a raw catalyst for WMTC test. The cooling air was blocked during the cold start, which results in the reduction of 20 s of cold-start time, a period of time from the vehicle starting from ambient conditions to the moment when the engine goes into closed loop mode. Also, the cold phase is reduced by 18.8%, which reduced 12.8% of THC raw emissions and achieved 1.6% fuel economy improvement.
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