“Tough Gear”and “High Quality”for New X-TRAIL - 1. Evolution of genuine SUVs: New X-TRAIL e-4ORCE“e-POWER” × “VC-TURBO”Fig. 4 Hill-start performance when climbing a dirt hill with a 20% gradientFig. 5 Level of quietnessFig. 6 Second-generation e-POWER × VC-TURBO3. Power and high level of quietness:3.1 Second-generation e-POWERFurther, driving and regenerative braking forces were controlled in units of 1/10,000 s while calculating the grip limit of each wheel. This allows the driver to operate the accelerator pedal without feeling insecure even when driving on slippery, downhill, and snowy road surfaces.In addition, the level of quietness and ride comfort is improved significantly, thus providing a “high quality” driving experience. The new X-TRAIL operates like an EV when driving at low speeds (e.g., in urban areas). Even when the engine generates electricity, the level of realized quietness does not allow the occupants to notice that the engine is running (Fig. 5).The sinking behavior and body motion of the vehicle during deceleration are suppressed by reforming the suspension and using the pitching control of e-4ORCE. Thus, the occupants are less likely to feel the bodymotion in the front-rear direction when the vehicle is repeatedly started and stopped (e.g., driving in urban areas and in congested traffic). This helps realize a comfortable and high quality riding experience not only for the driver but also for the occupants in the passenger seat and rear seats.The technological innovations that enabled the “Tough Gear” × “High Quality” concept of the new X-TRAIL are summarized in the following sections. The new X-TRAIL is mounted with high-power motors at the front and rear. The variable compression ratio engine “VC-TURBO” (Fig. 6), mass-produced for the first time in the world by Nissan, is adopted as the power generation engine. This engine provides benefits such as powerful acceleration performance, low fuel consumption, and significantly improved level of quietness.The second-generation e-POWER system incorporated in the new X-TRAIL includes high-power/high-torque front (150 kW/330 N・m) and rear motors (100 kW/195 N・m), which enable quick response and powerful acceleration performance on high-speed roads and off-road tracks. During normal cruising, low fuel consumption is achieved by optimizing the energy efficiency based on the area of frequent engine usage in the e-POWER system.Energy management is performed by minimizing the engine starting frequency when driving at low speeds (e.g., in urban areas) and by generating electricity at low engine speeds efficiently, even when the engine needs to be started. Furthermore, the adopted control technology detects road surface conditions and starts the engine when the road noise is high, which leads to a level of quietness that can be compared to that of EVs during normal driving.6
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