System Description

The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change characteristic is attained.

Fig 1: Clutch Shift Control Valve Communication Diagram

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Shift Change

The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque information, etc.

Fig 2: Shift Change - System Diagram

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*1: Full phase real-time feedback control monitors movement of gear ratio at gear change, and controls oil pressure in real-time to achieve the best gear ratio.

Blipping Control

It controls (synchronizes) engine speed to have a quick shift clutch coupling, by calculating engine speed after downshifting and by cooperating with ASC (Adaptive Shift Control).

• "BLIPPING CONTROL" functions.
  • When downshifting by accelerator pedal depression.
  • When downshifting by the manual mode.
  • It works on shift-down operation by ASC at high speed side when driving at D position or in DS mode.

Fig 3: Blipping Control Operational Graph

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• TCM selects "BLIPPING CONTROL" or "NORMAL SHIFT CONTROL" according to the gear position, the selector lever position, the engine torque and the speed when accelerating by pedal depression.
• Engine speed control demand signal is transmitted from TCM to ECM under "BLIPPING CONTROL".
• ECM synchronizes the engine speed according to the engine speed control demand signal.

Fig 4: Blipping Control Performance Graph (Downshifting By Accelerator Pedal Depression)

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Fig 5: Blipping Control Performance Graph (Downshifting By Manual Mode)

Courtesy of NISSAN NORTH AMERICA, INC.