[Exhaust Emission Characteristics of Typical Alkanes from Heavy-Duty Diesel Vehicles Based on a Portable Emission Measurement System].

The on-road emissions of typical alkanes from 11 heavy-duty diesel vehicles with different emission standards (from China Ⅰ to China Ⅳ) were tested using a portable emission measurement system(PEMS) and quantified by gas chromatography-mass spectrometry (GC-MS). Our aim was to analyze the emission characteristics of typical alkanes in heavy-duty diesel vehicle exhaust. The results show that the emission standard significantly affected the emission factors (EFs) of -alkanes and hopanes.

[Development of the driving cycle-based mobile emission model (DCMEM)].

Vehicle specific power (VSP) and engine stress (ES) were introduced to reflect the driving characteristics of vehicles in China. Emission rates of 60 BIN based on VSP and ES for light-duty vehicles were calculated on the basis of the on-board emission test data in 5 cities of China. The driving cycle-based mobile emission model (DCMEM) was developed to simulate CO, NOx and HC emission factors of light-duty vehicles for different cities or driving cycles.

Diurnal variation of number concentration and size distribution of ultrafine particles in the urban atmosphere of Beijing in winter.

Number concentration and distribution of airborne particles in the size range 5.6 to 560 nm diameter were measured in Beijing for a 15-d period in winter 2005. Daily average number concentrations of nucleation mode (5.

[Application study of IVE vehicle emission model].

This paper introduced IVE model and presented the method to quantify the main parameters by taking Beijing city as a case. Emissions from different vehicle fleets of Beijing were calculated using IVE model. The results show that emissions factors of buses and trucks were much higher, especially for PM, which were 14 and 44 times those of passenger cars.