7 新型ガソリンエンジン「SKYACTIV-G 2.5 気筒休 …

1 35 2017 CX-5 7 1, 6 2 Engine Design Engineering Dept. Engine Performance Development Dept. 3 Driveability & Environmental Performance Development Dept. 4 PT 5 PT Control System Development Dept. Drivetrain Development Dept. 35 SKYACTIV-G Newly Developed Gasoline Engine SKYACTIV-G with Cylinder Deactivation Zoom-Zoom SKYACTIV-G SKYACTIV-G CX-5 SKYACTIV-G Summary Mazda had developed SKYACTIV-G based on its long-term vision, Sustainable Zoom-Zoom.

2 The engine has achieved both driving dynamics that offer drivers the opportunity to celebrate driving and excellent environmental performance, and received a favorable reception from the market. On the other hand, Downsized engines mass-produced by other OEMs have become a competitive threat to SKYACTIV-G. Mazda has therefore developed a new engine based on the Rightsizing concept evolved to pursue highly responsive driving and good real-world fuel economy, and installed it in the All-New CX-5. The new engine, which has adopted cylinder deactivation system as well as the combustion technologies and friction-reducing technologies evolved from SKYACTIV-G, has excelled down-sized engines in thermal efficiency over the entire load range and further enhanced the balance between driving dynamics and low fuel consumption.

3 This paper introduces the concept of the engine and the adopted technologies with a focus on cylinder deactivation system. 1. Zoom-Zoom SKYACTIV-G (1) (2) (3) SKYACTIV-G CX-5 SKYACTIV-G 2 1 3 HiroyukiArakawa Akihiro NodaToshiki Inoki 5 4 6 Narihito Hongawara Takahiro YamamotoToshiaki Nishimoto 36 2017 2. SKYACTIV-G SKYACTIV-G 3.

4 Fig. 1 Vision for Evolution of Internal Combustion Eng SKYACTIV-G Fig. 3 Fig. 4 Fig. 2 SKYACTIV-G with Cylinder Deactivation Table 1 Specifications *1: Hydraulic Lash Adjuster EngineSKYACTIV-G DeactivationEngine TypeIn-Line 4 Displacement2488cm2 Bore x Stroke89mm x 100mm Compression Ratio13 Fuel InjectorDI6 holesDI6 holes w/short penetrationFuel Pressure20 MPa max30 MPa maxValve TrainHLA (*1) + Roller follower#1/4: S-HLA + Roller follower#2/3: HLA + Roller followerOil PumpElectric control2 stageElectric controlVariableCoolant Flow Controlw/ow/ 37 2017 Fig.

5 3 Fuel Consumption Characteristics Fig. 4 Engine Performance Fig. 5 Fig. 5 Fuel Consumption Map 4. S-HLA S-HLA S-HLA S-HLA Fig. 6, 7 Fig. 6 S-HLA Fig. 7 Cylinder-Head with S-HLA Fig. 8 Fig. 3 2 4 38 2017 Fig. 8 Driving Area of Deactivation 4 A) B) 4 4 B A 4 Fig.

6 9 4 Fig. 10 4 Fig. 11 (1) 4 (2) Fig. 10 Fig. 12 Fig. 9 Cylinder Pressure after Deactivation Fig. 10 Charging Efficiency at just after "Deact. to Act." Fig. 11 EGR Influence on Combustion Characteristics 39 2017 Fig. 12 Effect of Torque Control Strategy NVH Fig.

7 13 Fig. 13 Comparison of Crank Torsional Vibration 1 4 4 1 2 3 1 4 1 4 2 3 Fig. 14 Fig. 14 Vibration Charasteristics of "Deactivation to Activation" NVH CPA Centrifugal Pendulum Absorber Fig. 15 Fig15. Torsional Vibration Model of Drivetrain 4 40 2017 Fig.

8 16 Damping Mechanism of CPA NVH Fig. 17 Vibration Improvement Effect 5. SKYACTIV-G SKYACTIV-G (1) (2011)(2) CX-5 SKYACTIV-G (2012)(3) SKYACTIV-G (2016)