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Technical Paper

Investigation on Measurement of Diesel Spray Breakup Length by Using Doppler Signals

2001-03-05
2001-01-0533
New measuring methods of diesel spray characteristics were investigated by using laser Doppler signals, when diesel spray was injected into a high pressure vessel at room temperature(Injection under the high pressure means the simulation of injection atmosphere of diesel engine). We describe two methods of breakup length measurement, and these have great advantage compared with the conventional method using spray photographs. First, spray tip penetration was measured by the delay time of Doppler signals from injection start to spray tip arrival at each measuring point (measuring volume of Laser Doppler Velocimeter (LDV)), traversing the measuring point along the spray axis center line or offset line of the center line from nozzle hole towards downstream. Spray breakup length was measured as the inflection point of the curve drawing the delay time of Doppler signals versus the measuring points.
Technical Paper

Development of Three-Way Catalysts Enhanced NOx Purifying Activity

2018-04-03
2018-01-0942
Growing concerns about the depletion of raw materials as vehicle ownership continues to increase is prompting automakers to look for ways of decreasing the use of platinum-group metals (PGMs) in the exhaust systems. This research has developed a new catalyst with strong robustness against fluctuations in the exhaust gas and excellent nitrogen oxide (NOx) conversion performance. One of the key technologies is a new OSC material that has low surface area (SA) and high OSC performance. We enhanced the pyrochlore- ceria/zirconia (CZ) which has a very small SA. In order to enhance the heat resistance and promote the OSC reaction, we selected and optimized the additive element. This material showed high OSC performance especially in the temperature range of 400 degrees or less. Another key technology is washcoat structure that has high gas diffusivity by making connected pore in the washcoat (New pore forming technology).
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