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Feng Q.,Tongji University | Lou D.-M.,Tongji University | Ji W.-B.,SAIC | Ji W.-B.,Shanghai Internal Combustion Engine Research Institute | And 2 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2014

Effects of DOC and DOC+CDPF on gaseous emissions, such as CO, THC, NO, NO2, and SO2 from a heavy-duty diesel engine were studied based on AVL-PEUS FTIR equipment. Results show that: compared with DOC, DOC+CDPF can decrease light-off temperature of CO. On the active sites, hydrocarbons show stronger adsorption and competition ability for active sites than CO, therefore, hydrocarbons oxidation can reach much lower light-off temperature. DOC and DOC+CDPF can reduce NO and NOx, but increase NO2 through oxidation mechanism. Catalyst added with CeO2 can restore sulfide at lean-burn and release it at rich-burn conditions, which could enhance resistance of sulfur poisoning. Source


Ji W.-B.,SAIC | Ji W.-B.,Shanghai Internal Combustion Engine Research Institute | Lou D.-M.,Tongji University
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2014

In an EFI gasoline engine without any modification, ultrafine particles emissions characteristics when fueled with conventional gasoline, pure butanol, butanol-gasoline blends with butanol contents (in volume) of 10%, 15%, 20%, 50%, and 85% were measured respectively. Results show that compared with gasoline, the total ultrafine particla emission number concentration and mass concentration of butanol-gasoline blends increase with butanol content increasing, most obvious in speeds near the maximum torque point and the high load points. It is concluded that the total ultrafine particle emissions number increment is mainly resulted from nuleation mode particla emission number increase. Source


Feng L.-M.,Tianjin University | Gao W.-Z.,Tianjin University | He G.-W.,Shanghai Internal Combustion Engine Research Institute
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2011

To study effect of diesel particulate filter (DPF) on engine exhaust noise, a simplified three-dimensional DPF acoustical model was simulated numerically in engine operating conditions using Sysnoise software. By using obtained transfer matrix in DPF, the insertion loss in operating condition was calculated. On the engine test bed established in a half anechoic laboratory the DPF insertion loss was measured in rated and idling conditions. The comparison between experimental and calculated results confirms correctness of the model. Both two show that the DPF has a significant effect on high-frequency exhaust noise attenuation and viscosity plays a very important role in noise attenuation. Source


Luan Y.-L.,Tongji University | Li L.-G.,Tongji University | Wang Z.,Tongji University | Deng J.,Tongji University | And 2 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2010

To develop a free-piston engine-alternator power system for hybrid electric vehicles, key design parameters, such as reciprocating mass of the piston assembly, compression ratio, ignition timing, engine specific fuel consumption (SFC) and power output, were optimized based on simulation. The results confirm that rated power of the free-piston engine reaches 7.42kW and its min. SFC decreases to 313.4g/(kW·h), improved by 1.17kW and 34% respectively than the original. Source


Han G.-H.,Tongji University | Jin X.-X.,Tongji University | Hou Y.-F.,Tongji University | Yuan W.-P.,Shanghai Internal Combustion Engine Research Institute
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2012

Taking piezoelectric ceramic as executive component, an active-control approach i.e. directly controlling the plate vibration for control of the cavity noise was adopted, and applied neural net control technology, combined with adaptive technology, into the active noise control system of rectangular cavity. The collocated arrangement of sensors and actuators was adopted. Experiments demonstrate that this design has good noise-reduction effect. These fruits are useful for application of the multichannel active noise control theory in rectangular cavity, such as vehicle. Source

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