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3) Transmission Control Monitoring System
TCU monitors all input and output signals to identify possible failures. If a fault is detected, TCU
Monitoring the Supply Voltage
If the battery voltage is too high or too low, the TCU sets the DTC.
Monitoring the Supply Voltage to Solenoid
TCU monitors the circuits for open or short to ground or supply. The monitoring function
evaluates the voltage characteristics while the switch is ON.
Monitoring the Gear Ratio
TCU monitors the gear is engaged properly in the allowed time.
Monitoring the Torque Converter
TCU checks if the torque converter can be locked up properly. If it is failed, TCU releases the
torque converter clutch to activate the fail-safe operation.
4) Shift Energy Management
This function involves reducing or increasing the engine output torque during shifting. This
reduces the energy which is dissipated in the friction elements of the transmission during up-
shift. This is done by reducing the engine torque during the gear ratio change without interrupting
the tractive drive.
This function is used for:
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Increasing the life span of transmission by shortening the slipping time
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Improving the shift comfort by reducing the step changes due to gearshift
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Transferring a higher engine power
Real-time control of engine torque is required to maintain the proper shift operations and the
durability of transmission. TCU controls the engine torque during the gearshift by synchronizing
the operation of transmission clutches.
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