Shift Control
A/T CONTROL SYSTEM
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
*1: Full phase real-time feedback control monitors movement of gear ratio at gear change, and controls oil pressure at real-time to achieve the best gear ratio.
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 select 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 3GR or 4GR 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 the angle of accelerator pedal and vehicle speed. Fixing at 3GR or
4GR on an up-slope prevents shift hunting and controls the vehicle to gain maximum driving force. On a Downslope, automatic shift-down to 3GR or 4GR controls to gain maximum engine brake.
When Driving on a Curve
TCM receives side G sensor signal from ABS actuator and electric unit (control unit). Fixing at 3GR or 4GR based on the signal prevents shift-up and kick-down and controls to drive smoothly.