NOx reduction & brake thermal efficiency were found to be better for cold EGR up to about 20 % of EGR & so as to find out its effect on valid emission as well as for performance evaluation in this project carried on single cylinder four stroke water cooled CI engine. The effect of EGR temperature on engine thermal efficiency, NOx, smoke, HC emissions at different load condition for different EGR percentage are discussed in this project. EGR cooling can be advantageous when higher ratio of EGR needs to be employed. EGR temperature is an important factor while admitting higher percentage of EGR. NOx formation predominantly depends on high combustion temperature & included EGR is attractive method to reduced combustion temperature so as to reduce NOx. Emission from naturally aspirated direct injection single cylinder four stroke diesel engine, prevailing & future emission norms compels engine manufactures to incorporate to reduced engine out emissions especially NOx & Particulates Matter (PM). This project addresses the application of Exhaust Gas Recirculation (EGR) for reducing Oxides of Nitrogen (NOx). This project discusses the study of flow through orifice meter on EGR application in four stroke single cylinder CI engine. EGR system is a very effective technique for reducing NOx emission from a diesel engine, particularly at the high load of engine operation condition where the engine emits more NOx than at other conditions.
In recent years, the direct injection diesel engine has undergone very significant improvements in terms of fuel economy and exhaust emissions. The diagnosis is based on the fact in properly functioning systems, given all other things being constant and normal there is a direct completion between linear EGR Flow rate and manifold air pressure (MAP) changes. EPA regulations required linear EGR system monitoring to determine if there is a restriction in the exhaust gas recirculation systems. Enable Linear Flow Diagnostic means, the inputs to Enable linear EGR flow diagnostics are : No fault active on TPS, MAP, vehicle speed, intake air temperature, Idle air control, EGR pintle, Misfire, Transmission and coolant temperature etc. EGR system component: Any component of the systems performing outside of the speciation's that will result in exceeding any of the applicable FTP x 1.5. Linear EGR Flow rate: Abnormal low and high flow rate exceeding the specified low and high flow rate that will result in exceeding any of the applicable FTP x 1.5. As per Environment Protection Agency, (EPA) USA, and CARB standards the failure criteria for the catalyst monitor diagnostic are the following: 1. OBD-II, systems were designed to maintain low emissions of in use vehicles, including light and medium duty vehicles. NOx control system that recycles a small part of the inert exhaust gas back through the intake manifold through EGR valve, to the combustion temperature and this system is called EGR system. To control the Oxides of Nitrogen (NOx), there are only one method is available by Exhaust Gas Re-Circulation (EGR).
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