Automatic Transmission System
INTRODUCTION:
Automatic transmission system shifts the gears without assistance from the driver. They start the car moving in first and then shift into higher gears as the car speed increases and engine load decreases. The shifts are produced by hydraulic pressure acting through the transmission fluid.
The control system takes into account the engine load and in general produce changes up when the engine load is light and changes down when the engine load is heavy.
The main components that make up an automatic transmission include:
• The Torque Converter: This acts like a clutch to allow the vehicle to come to a stop in gear while the engine is still running.
• Planetary Gear Sets: They are the mechanical systems that provide the various forward gear ratios as well as reverse.
• The Hydraulic System: It uses a special transmission fluid sent under pressure to control the transmission
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