Engine control method for reducing emissions during cold start and idling for vehicle

摘要

An engine control method for reducing emissions during cold start and idling is provided, which includes: opening an ISA with a predetermined opening rate such that an air/fuel ratio becomes higher than a theoretical air/fuel ratio, and minimizing an engine load caused by an automatic transmission; performing air/fuel ratio control and ignition timing control based on engine speed and engine load, and controlling an amount of fuel injected in consideration of a quantity of wetting fuel; and determining an air flow rate according to an engine speed and coolant temperature, and performing air/fuel ratio control and ignition timing control to control an engine speed fluctuation. IMAGE