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김득상(D. S. Kim),강봉균(B. G. Kang),김성철(S. C. Kim),이상진(S. J. Lee),양창석(C.S. Yang),조용석(Y. S. Cho) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
UEGI (Unburned Exhaust Gas Ignition) is expected to help faster warm up of a close-coupled catalytic converter (CCC) by igniting the unburned exhaust mixture using two glow plugs installed in the upstream of the catalyst. In this study, a control module and an algorithm for the UEGI technology was developed. It changes I/O signals from the ECU, and controls ignition signals, glow plug on/off signals, and cooling water temperature signals to modify A/F ratios during cold start of the test engine. The control module is also designed to be readily applicable to a conventional vehicle, therefore, its repeatability, stability of UEGI flame, precision of light-off time and performance characteristics were tested and analyzed on an engine test bench. In addition, both the UEGI system and a hydrocarbon adsorber were applied to the exhaust system for more effective reduction of HC emission during the cold start period. Experimental results show that the CCC reaches the light-off temperature faster compared with the Baseline exhaust system, and HC and CO emissions are reduced significantly during the cold start. The UEGI control module proved its effectiveness in precise control of the UEGI system.