METHOD FOR OPERATING AN ENGINE

A method for operating an engine (100a,100) is disclosed. The engine (100a,100) includes an intake conduit (110) configured to supply air to the engine(100a,100), a primary air supply unit (102) configured to supply air to the intake conduit (110), a secondary air supply unit (104) configured to selectively supply air to the intake conduit (110). The method discloses selectively controlling supply of air from the secondary air supply unit (104) to the intake conduit (110) such that air fuel ratio is maintained between a first threshold value and second threshold value during increase in engine (100a,100) load.