1999-01-13

Development of Electronic Feedback Carburettor to Meet Year 2000 Indian Emission Norms 990034

Year 2000 emission norms for Indian passenger cars, which have been notified requires major changes in the existing technologies being used in the passenger car vehicles on roads. Electronic fuel injection systems and catalytic converters are being used extensively abroad to meet stringent emission regulations. Even in India, major joint ventures in passenger car segment have introduced vehicles with single-point / multi-point fuel injection systems. It has become difficult to meet the mandated emission regulations with the conventional mechanical carburetted vehicles.Automotive Research Association of India alongwith M/s UCAL Fuel Systems has developed an electronic feedback carburettor system to use alongwith catalytic converter for a passenger car to meet the year 2000 emission norms. A closed loop system has been designed and developed which takes the input from a λ-sensor output and controls the additional air added in the intake manifold of the engine through a stepper motor. The carburettor has been tuned to the richer side initially to allow the air to be added so as to maintain the air-fuel ratio near stoichiometry throughout the driving cycle to get the maximum catalytic converter efficiency.The various advantages of this system include simple system configuration, minimum modifications of the existing carburetted engine and low cost.The present paper describes the design philosophy, the development of various systems, modifications carried out in the vehicle and testing of the vehicle for mass emissions results. The results indicate that the passenger car developed with the electronic carburettor could meet year 2000 emission norms with a margin of over 30%.

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