Abstract
KEYWORDS – Controlled Valve Operation CVO, multi-injection, PN optimization, combustion stability, fuel metering accuracy
ABSTRACT
The potential of emission and combustion stability improvement through usage of multi-injection and Controlled Valve Operation (CVO) functionality was shown on the Hyundai Motor Company Kappa 3-cylinder TGDI 1.0L engine. The CVO function enables an individual injector feedback control leading to an equalization of the injected quantity from injector to injector over the whole injection duration range, thus allowing the usage of multi-injection patterns with extended degrees of freedom. Through the usage of multi-injection with short pulses, the exhaust gas emission during catalyst heating, steady state and transient operation could be reduced. Equalization of the cylinder individual injected quantity through the CVO functionality enabled a significant combustion stability improvement during catalyst heating with late ignition timing.