In a heavy-duty methanol engine developed
to meet China-Ⅵ emission standards, stoichiometric-combustion and lean-combustion strategies
were respectively applied to conduct cold-start and hot-start WHTC cycles. The raw exhaust emissions of regulated gaseous
pollutants and particulate matter were measured. Results showed that, compared
with stoichiometric-combustion, the lean-combustion strategy reduced methanol consumption by approximately
7%. Under both cold-start and hot-start conditions, lean-combustion operation
benefits decreasing CO，CH4，NOx，NH3, PM, and PN
emissions from the heavy-duty methanol engine. However,
lean-combustion operation led to higher unburned
methanol and formaldehyde emissions during cold starts, and increased NMHC
emissions during hot starts. With the lean-burn
strategy, the raw PM and PN emissions of the heavy-duty methanol engine already
met the China-Ⅵ limits, whereas NMHC and NOx remained the primary compliance
challenges. These issues can be addressed using an oxidation catalyst (OC) and
a selective catalytic reduction (SCR) aftertreatment system, but particular
attention should be paid to optimizing the control of unburned methanol and
formaldehyde emissions at low exhaust temperatures.
SHI Laihua, KANG Jianjian, LI Lan, WU Di, LIU Bing, WANG Xin
. A Comparative Investigation of the Emission
Characteristics of Stoichiometric Combustion
and Lean-Combustion Methanol Engines[J]. Vehicle Engine, 2026
, 0(3)
: 23
-28
.
DOI: 10.3969/j.issn.1001-2222.2026.03.004
