3 新型ガソリンターボエンジン「SKYACTIV-G 2.5T」の開発 …

1 16 2016 CX-9 3 1 2 3 Engine Design Engineering Dept. Engine Performance Development Dept. 4 5 6 Powertrain Technology Development Dept. Powertrain Planning Dept. Powertrain Development Div. SKYACTIV-G Newly Developed Gasoline Engine "SKYACTIV-G " Zoom-Zoom SKYACTIV-G CX-9 NA Summary Based on Mazda s long term technology development strategy (Sustainable Zoom-Zoom)

2 , a new series of SKYACTIV-G gasoline engines were developed to realize both fun-to-drive and environmental performance at high level. As a further evolved form of SKYACTIV-G, new turbocharged engine was developed to be mounted on the All-New Mazda CX-9. In the process of developing the new engine, as a fresh departure from the current downsizing engine, turbo-lag, which is the weak point of a turbocharged engine, was overcome, and transient response and torque controllability equivalent to a large-displacement natural aspiration engine were realized. As a result, lively driving and more torqueing-full performance were brought into reality and class-top fuel economy was achieved with an expanded low specific fuel consumption area.

3 This article introduces the concept and the technologies applied to this engine. 1. SKYACTIV-G Zoom-Zoom (1)(2)(3) CX-9 Fig. 1 3 4L SKYACTIV-G Fig. 1 SKYACTIV-G 2 1 3 Einosuke Suekuni Mitsuyuki MurotaniTomoaki Fujiyama 5 4 6 Kouhei Iwai Naoyuki YamagataReiji Okita 17 2016 2.

4 CX-9 Mazda V6 CX-9 Dynamic Pressure Turbo Cooled EGR Cooled EGR SKYACTIV-G 3.

5 Fig. 2 7 Fig. 2 Vision for Evolution of Internal Combustion Engine Cooled EGR Table 1 SKYACTIV-G NA SKYACTIV-G Cooled EGR NA 13 89mm Table 1 Dimension and Specifications 4. CX-9 Fig. 3 Fig.

6 4 1250rpm 350Nm 420Nm/2000rpm 169kW(230PS)/5000rpm 186kW(253PS) SKYACTIV-G NEW SKYACTIV-G 2488cm3 89mmx100mm Cavity Piston Large Cavity PistonDI 6 Hole Injector) Open(BTDC)-32 42-24 50 Close(ABDC)110 36100 26 Open(BBDC)58 1350 5 Close(ATDC)6 512 47 Electric Hydraulic HLA+Roller follower 50mmx 50mm RollerSilent Electric control 2stage)Electric control Variable)Water Jacket spacerw/oPlastic spacerw/oHP-Cooled EGRT urbocharger Systemw/oDynamic pressure turboSystem138kW(188PS)*1/5700prm142kW 192PS)*2/5700rpm169kW(230PS)*1/5000rpm18 6kW 253PS)*2/5000rpm250Nm*2/3250prm256Nm*1/3 250rpm420Nm/2000rpm*1 Regular Gasoline*2 Premium GasolineCrank main/pin journal diaValve trainEngineEngine TypeDisplacementBorexStrokeCompression ratioCombustion chamberChain type valve train OilOil Pump EGR TorqueFuel InjectionIntake-ValveTimingExhaust-Valve to idealFarClose 18 2016 Fig.

7 3 Vehicle Transient Acceleration Fig. 4 Engine Performance 5000rpm 169kW 186kW Cooled EGR SKYACTIV-G NA SKYACTIV-G Cooled EGR Fig. 5 Fig. 5 Fuel Consumption Characteristics 190km/h =1 Fig. 6 Fig. 6 =1 Area of Engine Operation 5. NA Fig.

8 7 Theory of Dynamic Pressure Turbo 19 2016 Q Pi 1 / : : : : 1620rpm 2 15 Fig.

9 8 Fig. 8 Effect of Dynamic Pressure Turbo System 1620rpm A/R Area Radius 20~25 4-3 Fig. 9 Fig. 10 Fig. 10 Fig.

10 13 2 A/R Fig. 9 Cylinder Head Exh. Port and Water Jacket Fig. 10 Dynamic Pressure Turbo System 20 2016 900 C CAE Fig. 11 Dynamic Pressure Turbo System Fig. 12 Exhaust Manifold with Variable Valve Fig. 13 Twin Flow Turbocharger Cooled EGR High- pressure Cooled EGR Fig. 14 Fig.