Forced locking of the torque converter in the automatic transmission
A torque converter is a device that connects the engine and transmission in an automatic transmission (AT). It provides smooth gear shifting and transfers torque from the engine to the transmission. Typically the torque converter operates in slip mode, which results in some power loss.
A positive torque converter lock-up is a mechanism that prevents the torque converter from slipping, resulting in several benefits:
*Improved Fuel Economy: With the torque converter locked, the engine can operate at higher efficiency, reducing fuel consumption.
* Increased performance: Forced torque converter lock-up reduces shift times and improves acceleration.
* Reduced heat generation: When the torque converter is locked, less heat is generated, which reduces the load on the automatic transmission cooling system and increases its service life.
How does forced torque converter lock-up work?
The torque converter forced locking mechanism includes:
*Lockup Valve: This valve controls the flow of transmission fluid to the lockup clutch.
*Lock-up Clutch: This clutch connects the pump impeller to the torque converter turbine impeller when the lock-up valve is actuated.
When the vehicle is traveling at a constant speed and does not require acceleration, the transmission control unit (TCU) activates the lock-up valve, which directs transmission fluid to the lock-up clutch. This creates pressure that forces the lock-up clutch to engage the pump wheel, eliminating torque converter slip.
Advantages of forced torque converter lock-up
*Improved fuel economy
* Increased productivity
*Reduced heat generation
*Longer automatic transmission life
Torque converter lock-up is a valuable feature that can improve automatic transmission performance and efficiency.