The New Inline 4 Cylinder 1.2L Turbocharged Direct Injection Gasoline Engine

Abstract

A new 1.2-liter inline 4-cylinder engine, a downsized turbocharged gasoline direct injection engine(8NR-FTS) is developed. The 8NR-FTS emphasizes compactness by adopting only direct injection(DI) system. In combination with a single-scroll turbocharger, high torque is achieved from low engine speeds by cooperative control with the Variable Valve Timing(VVT) with mid-position lock system. The engine can be mated with either a 6-speed manual transmission (6MT) or continuously variable transmission (CVT). Especially with the CVT, turbocharger lag duration is reduced by shifting control, and both fun-to-drive dynamic performance and excellent fuel economy of 10% better than a naturally aspirated (NA) 1.8-liter engine can be realized.