The New Generation XTRONIC CVT

The CVT (Continuously Variable Transmission), with its non-step gear change, offers not only smooth acceleration, but also a good fuel consumption level due to its gearing selection, and a powerful drive, thanks to the ability to select a transmission curve which is combined to the optimal engine rpm according to the vehicle speed. Nissan focused on this technology from an early stage, and adopted the CVT for the first time in the MARCH in 1992. Since then, continuous technical developments led to the release of a small CVT in 2010. This unit is small, lightweight, and achieves good fuel economy. This time, the New Generation XTRONIC CVT, suitable for engine sizes of over 2.0-liter has been developed while utilizing the advantages of our accumulated technological know-how. We have increased the CVT line up of 1.2-to-3.5-liter classes. Nissan will fulfil the role of reducing CO2 emissions by delivering the popular CVT around the globe .

The “New Generation XTRONIC CVT” expands its suitability to the 2.0-to-3.5-liter classes. Keeping the CVT’s smooth drive, this unit achieves a top class ratio coverage while being compact, and with sophisticated improvements to the efficiency of the respective mechanisms, a significant reduction in friction has been achieved, improving fuel economy by 10% over the previous CVT*. Also, from the accelerator and steering operation, the unit implements a control system that detects the intent of the driver, and selects an optimum transmission pattern. This provides a highly controllable and a more direct drive feel. Quickness of the power train, quick response, acceleration, and the unified feel to the acceleration and engine sound can be felt the moment the driver steps on the accelerator, all thanks to the hardware development and advanced control technology.
*In-house measurement using US Combined mode

Expansion of ratio coverage
A minute width expansion of axial distance, achieved with a narrower axle of the pulley and by a newly developed belt which caters for this configuration, resulted in the world’s top level ratio coverage of 7.0 from the previous ratio cover age of 6.0. This achieves strong acceleration upon launch. Furthermore, lowering the engine rpm at high speeds achieves improved fuel economy and a quiet drive.

Friction reduction
We returned to the basic machine design, and reviewed approximately 300 CVT components out of a total of approximately 500. In addition to this, miniaturization of the oil pump and the use of a newly developed low viscosity oil have been achieved, thanks to the reduction of the oil leakage. CVT friction is reduced by approximately 40%— a great contributing factor to improving fuel economy.

Transmission control (Adaptive Shift Control)
This system reads the driver intent from acceleration and steering operation, vehicle speed, and handling to provide optimum shift control and a driving feel that the driver wants. Coordinated control with engine and trans- mission gives optimal fuel consumption performance and driving performance.