227 ENGINE 273 MPFI ENGINE GENERAL DESCRIPTION Exhaust system of TATA NANO consists of exhaust manifold assembly, three way catalytic converter with lambda sensor, exhaust pipes and a silencer. All the burnt gases are expelled out through cylinder head, exhaust manifold, catalytic converter and silencer using exhaust pipes. As these gases consist of harmful pollutants like carbon monoxide (CO), nitrogen oxide (NOx), unburnt hydro carbons (HC) and particulate matter, they need to be converted in less harmful gases before they exhaled into the atmosphere. The three way catalytic converter, used inTATANANO, lowers the level of HC, CO, and NOx from exhaust gases with minimum loss of power, good NVH characteristics and long life. Hot exhaust gases from the Engine flows through Exhaust Manifold assembly to the Three Way Catalytic Converter . The Lambda Sensor mounted on exhaust manifold, measures the amount of oxygen present in exhaust gases and gives voltage signal to ECU accordingly. ECU adjusts the amount of fuel to be injected depending upon the received signal. When hot exhaust gases flow through catalytic converter, it gets converted in to less harmful gases. This is done by the catalyst present in catalytic converter. The rear part of the system comprises of Silencer assembly. 1 2 3 1 Exhaust manifold with three way catalytic converter 2 Lambda sensor 3 Silencer assembly with heat shield
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