Search Results

Particulate filter is one of the major technologies to meet air pollution environment regulation since the first introduction to market of diesel passenger car in 2000. It is an indispensable part from September 2011 when the particle number of exhaust gas should be limited for new models. This is also a hot issue for gasoline engines with direct injection technology for improvement of fuel economy even though the EURO 6 regulation for GDI gasoline vehicles is not yet finalized. Car OEMs are under development exploring various options. Otherwise this kind of technology has some task to overcome, such as back pressure resulting in a fuel penalty, burden of increased cost and temperature control within the durable limit. The materials for particulate filters have their own characteristics as material itself. The choice of material is heavily dependent upon the control strategy for soot regeneration.

For passenger car diesel engines, higher air density or higher boost pressure is essential to enhance power density and meet stringent emission regulations. However, single variable geometry turbines (VGT) are limited to eliminate the inherent drawbacks of turbochargers; low-end torque and rated power are hard to reconcile. With a serial two-stage turbocharger, outstanding power density - rated power of 165kW and low-end torque of 350Nm - was obtained from Hyundai Motor's R2.2l engine. Also, it was possible to maintain the maximum torque of 500Nm evenly from 1250rpm up to 2250rpm. Compared to the current R2.2l engine with a single VGT turbocharger, more than 12% of power density increased. The fuel economy of the two-stage turbocharged engine was slightly better than the current R2.2l engine, which resulted in further reduction of fuel consumption compared to a 3.0l single VGT engine.

S.E.A.T (Seat Effective Amplitude Transmissibility) index is used to evaluate ride comfort under vehicle driving condition. The proposed objective evaluation methodology uses several accelerometers to derive an objective index which is more reasonable than subjective evaluation. Moreover, a CAE (Computer Aided Engineering) methodology is proposed to obtain simulation results using the measured acceleration data at seat mountings as input conditions to seat system assembly. Finally, several case studies are conducted for maximizing ride comfort using the CAE model.