General information about automatic transmission (Peugeot 307)

Some Peugeot 307 vehicles are equipped with adaptive automatic transmissions. Since the automatic transmission is a complex unit, its repair must be carried out exclusively at a Peugeot service station using special equipment.

Torque from the engine is transmitted to the transmission through a torque converter, which functions as a fluid coupling and acts as an automatic clutch, also providing torque transfer during acceleration.

The torque converter is capable of operating in two ranges, in the first stage providing an increase in torque and in the second, functioning as a simple fluid coupling without any increase in torque.

The operating principle of a torque converter is similar to a hydrodynamic clutch. The car's engine drives a pump that transfers fluid energy, while the blades of a turbine connected to the transmission's input shaft transform that energy back into torque. A reactor located between the pump and the turbine blades directs the fluid back to the pump inlet.

The gearbox has four forward gears and one reverse gear. The transmission components are held and actuated by brake bands and clutches, which are controlled by a hydraulic control unit. The hydraulic pump installed in the gearbox creates the necessary pressure for the operation of the brake bands and clutches.

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The gearbox is controlled by a control unit, which receives signals from various sensors regarding the operating modes of the gearbox. The sensors detect the load, the position of the selector lever, the position of the program switch and the kick-down mode, as well as the rotation speed of the engine shaft and the driven shaft of the gearbox. The control unit processes this data in accordance with the installed program and generates transmission control signals, resulting in the vehicle's optimal speed being set in accordance with the driving style.