ASC (Adaptive Shift Control)

INPUT/OUTPUT SIGNAL CHART

Item

Signal

TCM function

Actuator

Input speed sensor 1, 2

Input speed

ASC (Adaptive shift 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⁾

ABS actuator and electric unit (control unit)

Side G sensor signal⁽¹⁾

BCM

Stop lamp switch signal⁽¹⁾

Combination meter

Tow mode switch signal⁽¹⁾

⁽¹⁾	This signal is transmitted via CAN communication line.

When driving on an up/down slope
ASC judges up/down slope according to engine torque data transmitted from the ECM and vehicle speed. Fixing at 4GR, 5GR or 6GR on an up-slope prevents shift hunting and controls the vehicle to gain optimum driving force. On a down-slope, automatic shift-down to 4GR, 5GR or 6GR controls to gain optimum engine brake.
When driving on a curve
TCM receives the side G sensor signal from the ABS actuator and electric unit (control unit). It locks to 4GR, 5GR or 6GR position in moderate cornering or to 3GR position in sharp cornering based on this signal. This prevents any upshift and kickdown during cornering, maintaining smooth vehicle travel.
- In driving condition where acceleration, deceleration, or lateral acceleration continues, it corrects gear selection in order to keep a smooth vehicle speed during the curve and to give an adequate driving force at the curve end.
When acceleration pedal is quickly released at curve entrance etc., it prevents an unnecessary shift-up.
On braking operation at curve entrance, it gives an early shift-down according to the deceleration.
In a sporty driving condition, it selects lower gear early even on a light braking operation, giving greater importance on driving force.
- TCM receives the side G sensor signal from the ABS actuator and electric unit (control unit). It locks to 4GR, 5GR or 6GR position in moderate cornering or to 3GR position in sharp cornering based on this signal. This prevents any upshift and kickdown during cornering, maintaining smooth vehicle travel.
  
  Fig 1: Adaptive Shift Control - System Diagram (Driving On Up/Down Slope)
  Courtesy of NISSAN NORTH AMERICA, INC.

Tow Mode

High driving torque is required for towing a heavy load. The tow mode enables torque-oriented driving by changing the shift schedule to that of delaying A/T gear shift timing (compared to normal driving).
TCM receives tow mode switch signal from combination meter via CAN communication. The tow mode turns ON when TCM receives the signal. TCM transmits a tow mode indicator lamp signal to the combination meter via CAN communication to turn ON the tow mode indicator lamp mounted in the combination meter.