Shift Control

SHIFT CONTROL
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.





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

Shift Change System Diagram





Blipping Control
This system makes transmission clutch engage readily by controlling (synchronizing) engine revolution according to the (calculation of) engine revolution after shifting down.
^ "BLIPPING CONTROL" functions.
- When downshifting by accelerator pedal depression at "D" position.
- When downshifting under the manual mode.
^ 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.
^ Revolution control demand signal is transmitted from TCM to ECM under "BLIPPING CONTROL".
^ TCM synchronizes engine revolution according to the revolution control demand signal.

Shift Change System Diagram





ASC (Adoptive Shift Control)
ASC automatically shifts or hold at the 2nd, 3rd or 4th gear on certain roads (up/down slope and curve) and driving condition.





When Driving On an Up/Down Slope
^ ASC judges up/down slope according to engine torque data transmitted from the ECM and vehicle speed. Holding gear at the 3rd or 4th on an up-slope prevents shift hunting and controls the vehicle to gain optimum driving force. On a down-slope, automatic shift-down to the 3rd or 4th gear controls to gain optimum engine brake.

When Driving On a Curve
^ TCM receives the lateral G sensor signal from the ABS actuator control unit. It locks the gear to the 3rd or 4th position in moderate cornering or to the 2nd position in sharp cornering based on this signal. This prevents any upshift and kickdown during cornering, maintaining smooth vehicle travel.

DS Mode
^ Changes to the shift schedule that mainly utilizes the high engine speed zone when ASC is active.
^ DS mode can be switched according to the following method.
- When the selector lever is in the "D" position, shifting the selector lever to manual shift gate enables switching to DS mode.
- When in DS mode, shifting the selector lever to the main gate enables to cancel DS mode.