Automatic transmission control circuit
Input signals:
*Accelerator pedal position
* Vehicle speed
* Engine load
*Transmission fluid temperature
* Gear selector position
* Signal from throttle position sensor
Transmission Control Module (TCM):
* Receives and processes input signals
* Determines the optimal gear depending on driving conditions
* Sends commands to transmission solenoids and actuators
Transmission solenoids and actuators:
* Hydraulic or electromechanical devices that:
* Control transmission fluid pressure
* Shift gears
* Fix the torque converter
* Turn gear lock on and off
Torque converter:
* Connects the engine to the gearbox
*Helps smooth gear shifting
* Allows the car to stand still without turning off the engine
Gear lock:
* Mechanism that blocks the torque converter when driving in top gear
* Improves power transmission efficiency and saves fuel
Output signals:
* Output shaft rotation speed
*Transmission ratio
*Transmission fluid temperature
* Fault codes (if any)
Interaction with other vehicle systems:
* The TCM interfaces with the electronic engine control unit (ECU) to coordinate gear shifts and optimize engine performance.
* The TCM can also receive signals from the stability control system to prevent gear changes at inappropriate times.