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UEGI (Unburned Exhaust Gas Ignition) is expected to help faster warm up of a close-coupled catalytic convener (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 AIF 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 star1. The UEG I control module proved its effectiveness in precise control of the UEGI system.



- 74p



This paper proposes a method to detect the misfired cylinder using Exhaust Pressure Ascent Rate.
If a misfire occurs, the engine will be lost some power and consumes the more fuel and the torque will be unsteady. Most of all, the misfire affects a bad influence of the 3-way catalyst and emits unburned hydrocarbon in the air.
To prevent these unusual phenomena and eliminate the factor of the environmental pollution. It is an important thing to detect the misfired cylindere.
Experimental results showed that the method using the exhaust pressure ascent rate is proven to be effective in the detection of misfired cylinder on gasoline engine regardless loads and revolutions of the engine

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ABSTRACT

1. 서론

2. UEGI 기술

3. 실험장치 및 실험조건

4. 실험결과

5. 결론

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UCI(KEPA) : I410-ECN-0101-2009-556-014007621