Engine control system provided with dual continuously variable valve duration device and method of gpf forcible regeneration using the same

Abstract

An engine control system is provided with a dual continuously variable valve duration (CVVD) device to optimize engine performance. The system includes an engine with a combustion chamber, an intake valve for selectively supplying an air-fuel mixture, an ignition plug for combustion, and an exhaust valve for expelling exhaust gas. The CVVD device adjusts the intake and exhaust valve durations. A turbine positioned downstream of the engine increases exhaust pressure, followed by a warm-up catalyst to preheat the exhaust gas, and a gasoline particulate filter (GPF) to filter soot. A controller, based on vehicle driving conditions, adjusts ignition timing, intake, and exhaust durations. When lambda (λ) is 1, the controller controls exhaust duration to avoid overlap with intake valve timing by retarding exhaust valve opening and advancing exhaust valve closing, thereby maintaining a negative valve overlap period and enhancing GPF regeneration and emissions control.