System Description: Description

To select the gear ratio that can give the driving force to meet driver's intent or vehicle situation, the vehicle driving condition such as vehicle speed or accelerator pedal position is detected and the most appropriate gear ratio is selected and the shifting method before reaching the speed is determined. The information is output to the primary pressure solenoid valve and secondary pressure solenoid valve to control the line pressure input/output to the pulley, to determine the pulley (movable pulley) position and to control the gear position.

D Position (Normal Mode) 

Gear shifting is performed in all shifting ranges from the lowest to the highest gear ratio.

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D Position (Sport Mode) 

The gear ratio is generally high by limiting the shifting range on the high side, and this always generates a large driving power.

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M Position (Manual Mode) 

• When the selector lever is shifted to the manual shift gate side or the paddle shifter is operated, the fixed changing gear line is set. By moving the selector lever or paddle shifter to + side or - side, the manual mode switch or paddle shifter is changed over, and shift change like M/T becomes possible following the changing gear set line step by step.

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  • Manual Mode Information

    The TCM transmits the manual mode shift refusal signal to the combination meter if the TCM refuses the transmission from the driving status of vehicle when the selector lever or paddle shifter shifts to UP side (+ side) or DOWN side (- side). The combination meter blinks shift indicator on the combination meter and sounds the buzzer to indicate the driver that the shifting is not performed when receiving this signal. However, the TCM does not transmit the manual mode shift refusal signal in the conditions as per the following.

    • When the selector lever or the paddle shifter shifts to DOWN side (- side) while driving in M1.
    • When the selector lever or the paddle shifter shifts to UP (+ side) side while driving in M7.

Hill Climbing And Descending Control 

If a downhill is detected with the accelerator pedal is released, the system performs downshift to increase the engine brake force so that vehicle may not be accelerated more than necessary. If a climbing hill is detected, the system improves the acceleration performance in re-acceleration by limiting the gear shift range on the high side.

Courtesy of NISSAN NORTH AMERICA, INC.

Control In Acceleration 

From change of the vehicle speed or accelerator pedal position, the acceleration request level of the driver or driving scene is evaluated. In start or acceleration during driving, the gear shift characteristics with linearity of revolution increase and vehicle speed increase are gained to improve the acceleration feel.