“Tough Gear”and “High Quality”for New X-TRAIL - 2. “VC-TURBO”and“e-POWER”SystemFig. 11 Zone definition of engine sound6.SummaryReferencesIn addition to the improvement of the frequency of engine operation described in 5.1.1, the best fuel economy point of the engine is improved with the use of the VC-TURBO engine (BSFC 217 g/kWh @ 2000 rpm), which results in the top-level fuel efficiency in its class (18.4 km/L for 4WD and 19.7 km/L for 2WD in the WLTC mode). In terms of exhaust performance, a 75% reduction in emissions from the 2018 standard is also achieved. The following technologies were developed through the development of the e-POWER system for the new X-TRAIL.Quietness)Optimal control of the engine operating frequency andtiming while lowering the engine speed during powergeneration by utilizing the characteristics of theVC-TURBO engine.Acceleration performance)Drive control utilizing the newly developed motor forgenerating high torque and high output to allow for quickresponse and constant high G.Acceleration feeling)Engine speed control to create an engine sound based onthe driver's acceleration request and vehicle speed.Fuel efficiency and exhaust performance)Optimum control of power generation at the best enginefuel efficiency point while optimizing the engine operationfrequency.Through these technologies, best in class levels of quietness, driving power, drivability, fuel efficiency, and exhaust performances in the C-segment SUVs were achieved.5.3 Fuel consumption and exhaust performanceThe engine and drive shaft are not mechanically connected in the e-POWER system, and therefore, the engine start time and the operation point after startup can be selected freely. Fuel efficiency and exhaust performance are greatly improved by exploiting this feature.（1） Akihiro Shibuya, Naoki Nakada, Makoto Kimura：Development of a Brand New Hybrid Powertrain for Compact Car Market （2016） （2） 渋谷 彰弘 ほか：電気駆動の魅力の拡散 日産技報 No.87 （2021） （3） 仲田 直樹：システムの特徴と今後の発展 日産技報 No.87 （2021）15
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