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Development of Four Cylinder SR Engine

1990; Linguagem: Inglês

10.4271/901714

2688-3627

Akihiko Sobue, Tamio Kawamura, Toshihiro Ninomiya,

Real-time simulation and control systems

The SR engine is a new medium-size, all aluminum (cylinder block, head, rocker cover and oil pan) in-line 4-cylinder gasoline powerplant developed as a replacement for CA engine in Nissan’s compact passenger cars. The development aim set for this engine was to achieve excellent power output and ample torque in the middle-and high-speed ranges, as well as a clear, linear engine sound up to the red zone. These performance targets have been achieved through the use of the 4-valve-per-cylinder DOHC design featuring a Y-shaped valve rocker arm system. This system allows a straight intake port for high power output and a narrow valve angle for a compact combustion chamber. The result is ample torque output as well as good fuel economy. THE G20 is added INFINITI channel’ sthird 1991 model to the North American and Canada area. The G20 concept centers on driving pleasurs, and the model was designed as a sport/luxury sedan. lie main aim was to develop an outstanding power unit with low fuel consumption, ample torque and a pleasant engine sound. This was realized by the SR20DE engine, which was designed simultaneously with the G20 model. Engine Design Concept In the last few years, the tendency was to increase the displacement of power unit for compact passenger car to 2.2 to 2.4 1 to increase the driving power. However, we dared to choose 2.0 1 for the G20. This was an excellent choice because it allowed its highly efficient 2.0 1 engine to be combined with compact design, good adaptability to future emission control regulation, and a high degree of driving pleasure. In the development of this engine, special emphasis was placed on the two following points. 1. A good balance between high output and fuel economy. 2. A pleasant engine sound at all stages from idling to its highest rpm. To achieve these goals, Nissan spared no effort, even going beyond their most modem technologies, to design an engine and to select outstanding: parts; thus, a car was created which completey satisfies the above requirements.