The engine control unit (ECU) and automatic transmission control unit (ATM) are closely connected and work together to ensure optimal vehicle performance. The following are the main types of communication between these two control units:
Mutual exchange of data on the state of the engine and automatic transmission:
* The ECU provides the automatic transmission with data on engine speed, engine load, engine temperature, etc.
* The automatic transmission provides the ECU with data on the position of the gear selector, vehicle speed, engine speed, etc.
Gear shift:
* The automatic transmission requests permission from the ECU to change gear depending on the engine and vehicle input data.
* The ECU may accept or reject shift requests depending on the current engine and vehicle operating conditions.
Engine torque limit:
* The automatic transmission may request the ECU to limit engine torque during gear shifts or under other conditions to ensure smooth shifting.
* The ECU may reduce fuel delivery or change ignition timing to reduce engine torque.
Torque converter lock-up mode:
* The automatic transmission informs the ECU when the torque converter (GDT) is blocked.
* The ECU can change the engine control strategy depending on the state of the gas turbine engine.
Anti-slip:
* The automatic transmission detects slippage in the transmission and reports this to the ECU.
* The ECU can adjust engine torque or signal to the driver to prevent transmission damage.
Remote communication:
* Some vehicles use remote communication between the ECU and the automatic transmission unit to transfer data between multiple control units in the vehicle.
* This allows you to optimize the operation of the system as a whole.
With these connections, the ECU and transmission unit can coordinate to ensure optimal performance, fuel efficiency, and longevity of the transmission.