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Development of a microwave-regenerated particulate filter system has evolved from bench scale work to actual
diesel engine experimentation. The filter system was initially evaluated on a stationary mounted 1.2-L diesel engine and was able to remove a significant amount of carbon particles from the exhaust. The ability of the microwave energy to regenerate or clean the filter was also demonstrated on this engine under idle conditions. Based on the 1.2-L experiments, improvements to the filter design and materials were implemented and the system was re-evaluated on a vehicle equipped with a 7.3-L diesel engine. ENGINE EXHAUST TESTING EXPERIMENTAL DETAILS- In previous evaluations of other microwave regenerated filter devices, the cleaning cycle was applied while the exhaust was bypassed around the filter [3]. Practical application requires the filter cartridge cleaning cycle to be performed under realistic engine operating conditions without a bypass valve system. Therefore in these experiments, the microwave cleaning cycle was always conducted at idle conditions for all engines. The filter was loaded at various steady state and transient cycle conditions, and then engine conditions were changed to idle for the five-minute microwave cleaning sequence.
Tags:microwave energy, carbon particles, bench scale, diesel exhaust, filter devices
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