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Based on 3- dimensional velocity data at intake valve exit area of typical SI engine intake ports (horizontal and sloping directed ports) measured by hot wire anemometry in a steady flow rig, the magnitudes and compositions of inflow angular momentum flux and swirl ratios at the end of induction process generated by each velocity component were computed at different intake valve lifts and distances along valve axis. A microscopic evaluation method was provided for evaluating intake port characteristics according to intake valve exit flow field.

In order to improve the compactness and simplify the structure of diesel particulate bag filter, a preliminary design and test of an envelope bag filter were carried out, and the results confirmed that it is unpractical to adopt envelope bag in diesel particulate bag filter design. Therefore, another double-layer tube bag filter was developed which has a compact and simple structure. The filter was tested on a 485Q diesel engine dynamometer bench, and the results showed that it worked reliably with particulate collection efficiency more than 90% and its effect on diesel economy no more than 1%.