《汽车英语 Automobile English》课件01.pptVIP

Chapter OneUnit One Engine Step I. General idea of vehicle: sample different types (warm-up)  Transportation can be classed as transportation for people and transportation for goods. For example, individual cars, automobiles, buses are used for transporting people, and trucks and tractors are usually used for transporting goods. But we also should know that there is no strict classification, because some of the concepts overlap quite a lot. The first group of pictures are automobiles which can hold 1-8 people. These are all automobiles, also can be called sedans or saloon cars. They differ from each other by different emissions. The second group are buses. They are the oldest bus in the world, the double-deck bus, and so on. The third group are trucks. They can be classed as light truck, medium and heavy trucks by size. Let’s see some light trucks. The first group is familiar to us, because they can be seen in North America, Africa and Asia. The second group is commonly used in Europe, called vans. The following three groups are medium trucks. Then we can see some heavy trucks, e.g. road train, off-road truck. The fourth group are tractors. Now let’s see some special type vehicles. They are bulletproof cars and armored cars. They are groovy! Play a Game: Test your eyesight: Students are required to distinguish the different types of vehicles based on these pictures as quickly as possible. Step II. Main structures of a vehicle (Emphasis)  1. Main structure: The four main components of a vehicle are engine, chassis, body and electronic system. Among them, engine is the most important and complicated part in an automobile, and can be called the heart of an automobile. So we will talk about engine in this class. 2. Engine Definition of Engine Classification Engine main Components Operating Principles Step III. Engine structure (have a brief look) 1. Two mechanisms: connecting rods and crankshaft, valve gear 2. Five systems: Fuel, lubricating, cooling