Based on the heavy-duty natural gas engine which
met China Ⅵ b emission standards, the WHTC cycle
emission test was carried out on the engine bench in Weifang and Kunming to
study the performance of natural gas engine in high-altitude
area. It was found that the WHTC cycle work of engine reduced, the torque
response regression became poor, the excess air coefficient was small and
fluctuated greatly, the exhaust temperature was high, and the EGR rate was set
more than the actual value in Kunming. When operating at two different
altitudes, the natural gas engine met China Ⅵ emission
limits for all pollutants. Compared to Weifang, Kunming showed 22.6% lower NOx emission, 53.2% higher THC emission, and
32.3% higher CO emission. The study indicates that engine development and
calibration must account for varying altitude environments, allowing for
greater emission margin.
ZHANG Teng, YANG Zhaoshan, TIAN Maojun, SHI Xiangdong, WANG Youming, YIN Zhimei
. Experimental Study on WHTC Cycle of Heavy-Duty
Natural Gas Engine at Different Altitudes[J]. Vehicle Engine, 2025
, 0(5)
: 35
.
DOI: 10.3969/j.issn.1001-2222.2025.05.005
