Chapter 2 Transmission Section 1 Introduction 2.2 Operation Manner According to operation manners,transmissions are divided into three types:manual,automatic and semi-automatic. (1)Manual transmissions rely on drivers direct control of the gear lever to shift. (2)Automatic transmissions rely on drivers control of the accelerator pedal to control the speed. (3)Semi-automatic transmissions can be divided into two forms: one is that several commonly used gears are in automatic control, while other gears are manipulated by the driver;The other is that the driver sets the required gears forward with the button,and then achieve to shift through the accelerator pedal to connect the electromagnetic device or hydraulic device. 机械电子工程学理 Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Chapter 2 Transmission 2.2 Operation Manner According to operation manners, transmissions are divided into three types: manual, automatic and semi-automatic. (1)Manual transmissions rely on drivers direct control of the gear lever to shift. (2)Automatic transmissions rely on drivers control of the accelerator pedal to control the speed. (3) Semi-automatic transmissions can be divided into two forms: one is that several commonly used gears are in automatic control, while other gears are manipulated by the driver; The other is that the driver sets the required gears forward with the button, and then achieve to shift through the accelerator pedal to connect the electromagnetic device or hydraulic device. Section 1 Introduction