Shifting Control

SHIFTING CONTROL

ORDINARY SHIFT CONTROL
The TCM controls each solenoid based on input signal information such as inhibitor switch signals, vehicle speed signals and accelerator pedal position signals, to automatically select the optimum gear position from the shifting map.

ENGINE COOPERATIVE CONTROL
During shifting, the TCM outputs a torque-down requirement signal, and the ECM receives this to retard the ignition timing of each cylinder to temporary decrease the output torque from the engine. Simultaneously with this control, the TCM constantly monitors the shift sequence through vehicle speed sensors and the turbine speed sensor to perform feedback control and optimize gear shifts. Because of this control, a smooth and comfortable gear shifting is ensured under all conditions.

ABS COOPERATIVE CONTROL
When the ABS is operating, the optimum gear speed for the vehicle speed is selected by cooperative operation with the ABSCM to prevent degrading the operation of the ABS.

CONTROL AT HIGH OIL TEMPERATURES
If the ATF temperature becomes extremely high, shifting control is performed by automatically switching to a shifting map that is less likely to cause temperature rise.

CONTROL WHEN ATF OR ENGINE COOLANT TEMPERATURE IS LOW
When the ATF temperature or engine coolant temperature is extremely low at engine start, etc., shifting control is performed by automatically switching to a shifting map that causes temperature rise easier.

CONTROL WHEN CRUISE CONTROL IN OPERATION
When the cruise control is operating, shifting control is performed by automatically switching to a shifting map that is suitable for cruise control.