The objective of the present work is to reduce the light-off time of the catalyst and at the same time reduce the thermal degradation and ageing of the catalyst to the minimum possible extent by adopting an approach with Dynamic Catalytic Converter System (DCCS). In this approach, the catalytic converter is kept very close to the exhaust manifold during cold start of the vehicle and once it attains the light-off temperature the converter is moved to a far away position as any other conventional converter thereby reducing damages caused due to overheating. The emission tests were conducted in a four-cylinder spark ignition engine with DCCS at different positions from the engine outlet manifold and also with pre-catalysts of 40% volume of the main catalytic converter. It was established that considerable reduction in the light off time was achieved by using DCCS and light-off time was further reduced by using pre-catalysts as compared to the conventional catalytic converter. The CO light-off time of main catalytic converter reduced 60% with DCCS with PC (40%) and the corresponding reduction for HC light-off time is 57% compared to main catalytic converter without DCCS.
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