Abstract
Based on an engine test bench with intake and exhaust
altitude simulation function, the world harmonized transient cycle（WHTC） emission tests were carried out on a China Ⅵ diesel engine at altitudes ranging from 0 m to 4 000 m. The WHTC
cycle was further divided into typical operating conditions corresponding to
the actual vehicle operation scenarios, namely urban condition, suburban
condition and highway condition. The pollutant emission characteristics of
diesel engine were investigated under different altitudes and operating
conditions, as well as the both combination. The results showed that the
emissions of CO, HC and NOx at 4 000 m increased by 11.5 times, 25.3 times and 6.4 times respectively
compared with those at 0 m, while the exhaust particle number（PN） specific emission was almost unaffected
by altitude. The specific emissions of CO, HC and NOx under urban condition were 7.7 times, 5.5 times and 6 times of
those under highway condition respectively; and the PN specific emission under
suburban condition was 7.5 times and 3.4 times of that under urban condition
and highway condition respectively. The exhaust gaseous pollutant emissions of
diesel engine were strongly correlated with the engine output power and
altitude. The correlation coefficients between the specific emissions of CO,
HC, NOx and the ratio of
altitude coefficient to power coefficient were 0.91, 0.78 and 0.79
respectively, whereas the PN specific emission exhibited low correlation
coefficients with both engine output power and altitude.
Key words
diesel engine /
altitude /
operating condition /
pollutant /
emission characteristic
Cite this article
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ZHENG Yongming, LEI Jilin, XIE Libing.
Pollutant Emission Characteristics of Diesel Engine
under Different Altitudes and Operating Conditions[J]. Vehicle Engine. 2026, 0(1): 34-40
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