SHIFT CHANGE CONTROL: System Description: Notes

INPUT/OUTPUT SIGNAL CHART

Item

Signal

TCM function

Actuator

Input speed sensor 1, 2

Input speed

Shift change control

High and low reverse clutch solenoid valve
Direct clutch solenoid valve
Input clutch solenoid valve
Low brake solenoid valve
2346 brake solenoid valve
Front brake solenoid valve
Torque converter clutch solenoid valve
Line pressure solenoid valve
Anti-interlock solenoid valve

Output speed sensor

Vehicle speed

A/T fluid temperature sensor

ATF temperature

ECM

Engine speed signal⁽¹⁾

Accelerator pedal position signal⁽¹⁾

Closed throttle position signal⁽¹⁾

Engine and A/T integrated control signal (Engine torque)⁽¹⁾

BCM

Stop lamp switch signal⁽¹⁾

⁽¹⁾	This signal is transmitted via communication line.

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 Pressure Control Solenoid Diagram

Courtesy of NISSAN NORTH AMERICA, INC.

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

Courtesy of NISSAN NORTH AMERICA, INC.

*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.