Brand-new Nissan/Jatco 7-speed Automatic Transmission and its HEV Derivative

Authors

Masaaki Uchida, Shigeru Ishii, Nissan Motor Co., Ltd., Kanagawa Japan; Katsutoshi Usuki, Jatco Ltd., Kanagawa Japan;

Year

2009

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 697

Summary

Nissan and Jatco have developed a new 7-speed AT, which can reduce CO2 emissions by 7% compared to the existing 5-speed AT. With this new transmission both drivability and fuel economy are maximized trough highly efficient hardware and new software algorithms. This hardware and software cooperation includes friction minimization, lock-up area expansion and optimum gear position selection. This paper addresses several new features used in the AT and its near future derivative. As to the hardware; friction was minimized by efficient design of each component combined with a newly developed transmission fluid. As to the software, new gear shift control logic and electric acceleration pedal called “ECO Pedal” which is controlled harmonically with the gear shift schedule optimizes drivability and fuel economy. Finally, the derivative for an HEV version is discussed.

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