SKYACTIV TECHNOLOGY 1 CX-5 SKYACTIV-G のエンジン技術 Engine ...

No.302012

SKYACTIV TECHNOLOGY

1

CX-5 SKYACTIV-G

Engine Technology for SKYACTIV-G on CX-5

1

Hirokazu Hasegawa

4

Tatsuya Takahata

2

Yoshiharu Kusabiraki

5

Yasushi Nakahara

3

Tetsuo Hiraoka

6

Junsou Sasaki

SKYACTIV-G "Zoom-Zoom" 15

4-2-1 (1)

Summary

SKYACTIV-G is the gasoline engine which was developed based on the Mazda's long term technology development strategy (Sustainable Zoom-Zoom declaration: SKYACTIV-G aims at combining fun-to-drive and environment performance at a high level) and the engineers' everlasting dreams of realizing the ultimate internal-combustion engine. A challenging goal was set to realize the class top and world's best fuel consumption and full load torque by improving both the fuel efficiency and torque by 15% from those of the current engine.

Toward the achievement of the goal, breakthroughs were made on many technological issues, and the highest compression ratio ever as well as the 4-2-1 exhaust system is adopted as standards.

1.

SKYACTIV-G 1.3L 2.0L "Zoom-Zoom"

CX-5 SKYACTIV-G 2.0 4-2-1

2.

Fig.1 SKYACTIV-G 15 (1)

SKYACTIV-G CX-5

*15 Engine Engineering Dept.

*6 Engine Performance Development Dept.

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No.302012

3.

3.1 14 13 1 2 SKYACTIV-G 1.3 No.29

BSFC (g/kWh)

2 0 g/kWh

Scatter band measured by3rd party =10exht.EGR 2000/200kPa

Base engine measured by3rd party

15% Positioning of SKYACTIV

500

1000

1500

2000

2500

3000

Engine Displacement (cc) SKYACTIV-G

(2) SKYACTIV-G 2.0CX-5 SKYACTIV-G

15 SKYACTIV-G 1.3 14 (1)

4.

Fig.2 2,000rpm 14 78 15

20Nm

Torque (Nm)

Base engine

Scatter band measured by 3rd party

95RON

0

1000

2000

3000

4000

5000

6000

7000

Engine Speed (rpm)

Fig.1 Positioning of SKYACTIV-G(1)

3.2 (1) SKYACTIV-G 1.3

SKYACTIV-G 1.3 14 CVT Cooled EGR

(3)

Fig.2 Roadmap to Achieve the Torque Target(2)

4.1 SKYACTIV-G 4-2-1 -20 (1)

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4-1 Fig.3 3 1 1 3 1

(2)

4.3

Fig.5

CAE

Scavenging Engine Speed

2000/3000 5000rpm 2500rpm

Pre-Silencer

Main-Silencer

1500rpm

Reverse from Exhaust manihold

1500

Reverse from Pre-Silencer

Fig.3 Advantages of 4-2-1 Exhaust System(2)

(2) 15

4.2 4-2-1 2 4-2-1 CAE Fig.4

Reverse from Main-Silencer

Cylinder Pressure (MPa)

0.4

Reverse from Exhaust manifold

0.2

Composition Wave

0

180 200 220 240 260 280 300 320 340 360 380 400

-0.2

Valve Overlap

-0.4

Crank Angle (deg)

Fig.5 Optimization of Exhaust Pulsation by Silencers

4.4 4-2-1 20 15

Fig.4 Image of Acoustic Excitation Test

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5.

4-2-1 SKYACTIV-G

5.1 4-2-1 "" 4-2-1 ""Fig.6

Fig.7

5.2 4-1 CX-5 4-2-1 Fig.8

Fig.6 "Loop type" 4-2-1 Exhaust System

Fig.7 Packaging Breakthrough by Loop Type Exhaust System

Fig.8 Exhaust Manifold of New AXELA and CX-5

"" 4-2-1 Fig.9 30

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Fig.9 Investigation of Welding Torch Accessibility

5.3 4-2-1 4-1 8 10degCA 4MPa Fig.10 30080 HC (1) EU Euro6 PZEV

6.

SKYACTIV-G 15

6.1 30 (1) 6.2 EGR EGR 10 EGR 16 EGR 20(1)

7.

SKYACTIV-G One Mazda CX-5

Fig.10 Feed Gas HC and Exhaust Gas Temperature at Cold Start(1)

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