车辆工程专业英语期末复习
1. The internal combustion engine is most common: t his obtains its power by burning a liquid fuel inside th e engine cylinder. There are two types of engine: gasol ine and diesel .Both engines are called heat engines; th e burning fuel generates heat which causes the gas insi de the cylinder to increase its pressure and supply pow er to rotate a shaft connected to the power train .
内燃机是最常见的，其动力来自气缸里液体燃料的燃烧。发动机有汽油机和柴油机两种，都称为热机。燃料燃烧产生热量，气缸内气体压力升高，从而提供动力，带动连接传动系的轴旋转。
2. The purpose of the complete suspension system is t o isolate the vehicle body from road shocks and vibrat ions, which will otherwise be transferred to the passen gers and load. It must also keep the tires in contact wit h the road regardless of road surface.
悬架系统的作用是隔离来自路面的的冲击和振动，防止它们传递给乘客和货物。另外不管路面如何，悬架系统都应该保持轮胎和路面的接触。
3. Drum brakes have a drum attached to the wheel hub , and braking occurs by means of brake shoes expandi ng against the inside of the drum. With disc brakes, a disc attached to the wheel hub is clenched between tw o brake pads.
在鼓式制动器上，制动鼓和轮毂连接，制动蹄张开压紧制动鼓内侧从而产生制动。在盘式制动器上，两个制动块之间的制动盘连接着轮毂。
4. Engine block:
The engine block is the basic frame of the engine. All other engine parts either fit inside it or fasten to it. It h olds the cylinders, water jackets, and oil galleries. The engine block also holds the crankshaft, which fast ens to the bottom of the block. The camshaft also fits i nside the block, except on overhead-cam-engines (OH C).
In most cars, this block is made of gray iron, or an allo y of gray iron and other metals, such as nickel or chro mium.
气缸体是发动机的基体。发动机其它的部件都安装在缸体内或固定在缸体上，它包含了气缸、水套和油道，以及固定在缸体底部的曲轴等。除凸轮轴顶置发动机外，凸轮轴也装在汽缸体中．大多数汽车汽缸体由灰铸铁或灰铸铁与其它金属如镍、铬的合金制造而成。6. Cylinder head:
The cylinder head carries the valves, valve springs an d the rockers on the rocker shaft, this part of the valve gear being worked by push-rods
缸盖上装有气门、气门弹簧和摇臂轴上的摇臂，推杆推动这部分气门传动机构工作。
Energy and Power:
Engines used in automobiles are internal combustion heat engines. They convert the chemical energy of the gasoline into heat within a power chamber that is calle d a combustion chamber. Heat energy released in the combustion chamber raises the temperature of the co mbustion gases within the chamber. The increase in ga s temperature causes the pressure of the gases to incre ase.
The pressure developed within the combustion chamb er is applied to the head of a piston to produce a usabl e mechanical force, which is then converted into usefu l mechanical power.
能源是用于生产电力。化工能源转化为燃料的燃烧的热量，这个过程被称为燃烧。如果发动机燃烧发生在汽缸内的地方，被称为发动机内部燃烧发动机。如果燃烧发生在汽缸外的地方，被称为发动机外部燃烧发动机。
用于汽车的能源叫内部燃烧高能源高温能源在燃烧室里降低能缓解气体燃烧在汽缸室里的温度。燃烧气体温度的升高引起气压变大。燃烧室内发展应用到了活塞产生一个可用的机械力，然后将其转换成有用的机械能。
Cylinder sleeve:
Cylinder sleeves are used in engine blocks to provide a hard wearing material for pistons and piston rings. The block can be made of one kind of iron that is light and easy to cast while the sleeves uses another that is better able to stand up wear and tear. There are two m ain types of sleeves: dry and wet.
缸体中的气缸套为活塞和活塞环提供了一种耐磨的材料。缸体可以采用某种重量轻且易铸造的铁来制造，而缸套使用的是另一种抗磨损和抗拉缸能力较好的材料制成。主要有两种类型的气缸套：干缸套和湿缸套。
Most pistons are made from cast aluminum. The pisto n, through the connecting rod, transfers to the cranksh aft the force created by the burning fuel mixture. This
force turns the crankshaft.
大多数活塞由铝铸造而成。通过连杆，活塞把可燃混合气燃烧所产生的力传递给曲轴，并带动曲轴旋转。
When the engine runs in compression stroke and powe r stroke, the valves must close tightly on their seats to produce a gas-tight seal and thus prevent the gases esc aping from the combustion chamber.
If the valves do not close fully the engine will not de velop full power. Also the valve heads will be liable to be burnt by the passing hot gases, and there is the like lihood of the piston crown touching an open valve, wh ich can seriously damage the engine.
当发动机在压缩冲程和作功冲程工作时，气门必须紧贴在气门座上，形成良好的气密性以防止燃烧室漏气。如果气门关闭不严，发动机就不能发挥出全部的功率。而且气门头部容易被经过的高温气体烧蚀，活塞顶部也可能会碰到气门使发动机严重损坏。
Gasoline :
Gasoline must vaporize easily. This characteristic, c alled volatility, is important. However, it must not vap orize too easily, or it will turn to vapor inside the fuel t ank or fuel lines. Inside the fuel line, fuel vapor may b lock the flow of liquid gasoline. This is called vapor l ock. Vapor lock is common in fuel lines where the inle t side of the pump is exposed to high temperatures.
汽油应易于蒸发，这个重要的特性称为挥发性。但是汽油也不能挥发得过快，不然它会在油箱或油管里转变为蒸气。在油管中汽油蒸气会阻碍液态汽油的流动，这称为气阻。汽油泵的入口处承受着高温，就经常出现气阻。
2.1.2通过曲轴连杆连接活塞,造成气体轴旋转半转。动力冲程“使用了”气压，意味着必须提供手段驱逐燃烧气体和回灌用新鲜的汽油和空气混合气体钢瓶：这种气体的运动控制是阀门的责任
2.2.3气缸盖扣紧到块顶部，正如屋顶适合在一幢房子。底部与活塞顶形成燃烧室。缸直列机,只有一种轻型车辆的所有缸，缸头大缸直列机可以有两个或更多。
2.3.2活塞是四个运动周期中一个重要部分,很多活塞都是从铝中提炼出来研制而成的.活塞,通过连杆传递能量来压缩点燃混合气体.
这些能力转化为曲柄的动能2.6.1汽油容易蒸发。这种特性被称为波动，是重要的。但是，它不能太容易挥发，否则将转向油箱内的蒸汽。管内的燃料，燃料蒸气可能阻止液体汽油流。这就是所谓的蒸气锁。在燃料蒸气锁普遍在暴露于高温线泵的进口侧。
M easurement of Dynamic Properties for Serpentine Belt and Friction Coefficient Between Belt and
Pulley
(school of Automotive Engineering, guangdong polytechnic Normal University, Guangzhou 510123) The influences of pre-tension,belt length,excitation amplitude and frequency on the longitudinal dyn amic stiffness and damping for a belt are measure d and discussed..The influences of the pre-tension of belt,wrap angle between belt and pulley and r otational velocity of pulley on the friction coeffici ent are measured and analyzed,and the ranges of the friction coefficient are obtained.
【Key Words】：serpentine belt、stiffness 、damping coefficient、friction coefficient
Multi-body Dynamics Analysis on Torsional Vibration of Automotive Engine Crankshaft
（Dept of Automotive Engineering, guangdong polytechnic Normal University, Guangzhou 510001）By using mult-body system simulation(MSS) method, combined with finite element analysis(FEA), the torsional vibration of automotive engine crankshaft is analyzed in this paper. The multi-body dynamics model for the crankshaft assembly including flexible crankshaft is established. The torsional vibration of crankshaft is analyzed based on the results of
multi-body dynamics simulation. The torsional vibration at the free-end of crankshaft was measured, which coincides well with the simulation.
【Key Words】：crankshaft 、Automotive engine、Torsional vibration
新 全 汽车专业英语期末试卷
汽车专业英语期末试卷 (100分） 一选择题（10分） 1 It does not only have economic effects but also provide C job opportunities A numerous B difficult to count C countless D a lot of 2 the electrical system contains battery light generator, engine ignition .lighting circuit, and various B that control their use A the socket B switches C the charger D battery 3 suspension is the term given to the system of springs . Shock absorbers and B that connects a vehicle to its wheels . A contact B linkages C meet D thing of 4 A solid axle designs utilize springs to soften their inherent harsh ride characteristics , they still bump along like a brick out house. A even though B even if C although D since
5 the frame A two straight pressed steel members, five cross members , the front axle , the rear axle and four wheels A consists of B be made up of C include D reason 二把下面的表达式转化为中文或英文（20分） 1 邮车 mail van 6 sedan 轿车 2 赛车 racing car 7 bumper 保险杠 3 救护车 ambulance 8 lamp 灯 4 越野车 off -road vehicles 9 tire 轮胎 5 洒水车 sprinkler 10 hood 发动机罩 三把下面的简写正确搭配（10分） FWD electrical suspension control system TD Four -wheel drive AT anti -lock brake system ABS turbo diesel ESCS automatic transmission 四写出下面单词的全称及意思 (10分） 1 SUV 运动型多功能用车 sports utility vehicle
车辆工程专业英语概述
The Principal Components Of Automotive 张可可2013210612 The Principal Components Of Automotive contains the body, the engine , the chassis , the power train system, the steering system, the suspension system and wheels , the braking system and the electrical and electronic system. 1 The body An automobile body is a sheet metal shell with windows, doors, a hood and a trunk deck built into it.It provides a protective covering for the engine, passengers and cargo. It is designed to keep passengers safe and comfortable. The body styling provides an attractive, colorful, modern appearance for the vehicle. 2 The engine The engine acts as the power unit. The internal combustion engine is most common: this obtains its power by burning a liquid fuel inside the engine cylinder. There are two types of engine: gasoline (also called a spark-ignition engine) and diesel (also called compression-ignition engine). Both engines are called heat engines. the burning fuel generates heat which causes the gas inside the cylinder to increase its pressure and supply power to rotate a shaft connected to the power train.
车辆工程汽车离合器的外文文献翻译
经典文档下载后可编辑复制 湖北文理学院 毕业设计(论文)英文翻译 题目有限元热分析的陶瓷离合器 专业车辆工程 班级Xxx 姓名Xxxx 学号2010138xx 指导教师 职称Xxx 副教授 2014年2月25日
Fethermal analysis of a ceramic clutch 1. Introduction Abrasive dry running vehicle clutches are force closure couplings. Torque and speed transmission are ensured by the frictional force generated between two pressed surfaces. Reasons for the application of ceramic as a friction medium include good heat and wear resistance properties, which provide the opportunity to drive higher pressures, and a low density. Thus, an increasing power density is enabled with a parallel minimization of construction space. Measurements with a first prototype of a clutch disk using ceramic facings were performed at Karlsruhe University in a laboratory specialized in passenger car drive system testing. In the course of analysis the finite element (FE) model was to be constructed with the knowledge of measurement data and measurement conditions. Calculations were intended to determine the temperature distribution of the clutch disk and its environment at each moment in time corresponding to measurements. It is essential to be familiar with the temperature range in order to examine the wear characteristics of the system. Thus, important information is derived from measurement data. In critical load cases, the highest expected temperatures must be forecast in space and time in order to protect measuring instruments close to the location of heat generation. The goal of this study is to analyze and modify the clutch system to provide better operating conditions by improving the heat conduction and convection of the system or to increase the amount of the energy converted into frictional heat. Furthermore, it is desired to find better design solutions for more efficient clutch systems. Calculations were performed by the Cosmos Design Star software. During model development, great care had to be taken for proper simplification of geometry, the selection of element sizes, and the correct adjustment of time steps due to the substantial hardware requirements for transient calculations. Changes in thermal parameters such as the surface heat convection coefficient and thermal load had to be taken into consideration on an on-going basis in terms of time and location. The two sides of the analyzed test clutch system can only be managed by two independent models linked by heat partition,
英语专业国家概况期末复习总结
英语国家概况 名词解释 1. The civil rights movement (1955–1968) refers to the reform movements in the United States aimed at abolishing racial discrimination against African Americans and restoring suffrage in Southern states. 2. A federal system A federal system is one in which power is shared between a central authority and its constituent parts with some rights reserved to each. 3. King Arthur It is said that he was the King of England in the 5th century and united the British and drove the Saxons back with his magical sword, Excalibur. His real existence is in doubt. He is the central figure of many legends. 4. The Anglo-Saxons They were two groups of Germanic peoples who settled down in England from the 5th century. They were regarded as the ancestors of the English and the founders of England. 5. Riverdance Riverdance is a very popular form of dancing based on I reland’s intricate folk dances which are rearranged and modernized and adapted onto current stage performance. Dancing is traditionally part of Irish culture. It is usually accompanied by the Irish pipe and fiddle. The music usually sounds fast and furious. Most of the action is from the waist down, with the arms held rigidly at the sides. 6. The House of Commons The House of Commons is the real centre of British political life because it is the place where about 650 elected representatives (Members of Parliament) make and debate policy. These MPs are elected in the General Elections and should represent the interests of people who vote for them. 7. The Commonwealth It is a voluntary association of states which is made up of Britain and mostly of former British colonies. There are 54 members of the Commonwealth including one currently suspended member: many of these are developing countries like India and Cyprus; others are developed nations like Australia, Canada and New Zealand. The Commonwealth was set up as a forum for continued cooperation and as a sort of support network. 8. Maoritanga Maoritanga means ―Maori culture‖. It refers to all the elements of the rich cultural heritage of the indigenous people in New Zealand, including their language, customs and traditions. 9. The “Washminster” form polity The ―Washminster‖form of polity is adopted by the Australian government. It is a mixture of the US Washington system of government and the British Westminster system. This means that the political
汽车专业英语期末考试题型说明
Terminal Reviews to English for the Automotive Profession I. Answer the following questions.(20%) Choose 5 of 6, 4 points for each, total in 20 points. 1. What does the drive train consist of? The drive train consists of clutch, transmission, driveshafts, differentials, and the final drive (drive wheels, continuous track like with tanks or Caterpillar tractors, propeller, etc.). In a wider sense, the drive train includes all of its components used to transform stored (chemical, solar, nuclear, kinetic, potential, etc) energy into kinetic energy for propulsion purposes. 2. How to install the drive gear? First, clean the drive gear attaching bolts. Second, remove the adhesive adhered to the threaded holes of the drive gear by turning the special tool, and then clean the treaded holes by applying compressed air. Third, apply the specified adhesive to the threaded holes of the drive gear. Forth, install the drive gear onto the differential case with the mating marks properly aligned. Tighten the bolts to the specified torque in a diagonal sequence. 3. What is the process of the ABS working? The Anti-lock Brake System (ABS) uses a sensor that know when one wheel (or a pair of wheels) is skidding. The sensor sends a signal to a computer, which signals a modulator valve. The modulator connects into the hydraulic system and can momentarily release the brake pressure and prevent the wheels from locking. (The pressure release is so fast that a driver is seldom aware of it.) Pressure is then reapplied until the sensor again sensor that the wheel is about to lock up. Thus, this system keeps the wheels as colse to lock up as possible, without actually allowing the wheels to lock up and skid. This is called incipient lock up. Maximum braking occurs at that point. 4. What is the purpose of gear reduction from steering gear? The gear reduction is known as steering gear ratio. This is needed to reduce the amount of effort required to turn the steering wheel, particularly when parking. During straight-ahead driving, this also reduces the possiblility of oversteering. The ratios vary considerably, depending largely on vehicle size and weight. Larger, heavier vehicles require a graeter reduction in manual steering gears. 5. How does the starter clutch work? The purpose of the starter clutch is to engage and disengage the pinion gear from the flywheel. When the starer is cranking, the pinion gear slides on the armature shaft and engages the flywheel. 6. How to check DTC in the normal mode? First, turn ignition switch off. Second, connect terminals TE1 and E1 of data link connector 1 or 2. Third, Turn ignition switch on. Forth, read the diagnostic trouble code on malfuntion indicator lamp on the combination meter. Fifth, afer completing the check, turn ignition switch off and disconnect terminals TE1 and E1. II. Translate the following into Chinese. (20%) Choose 20 of 30, 1 points for each, total in 20 points. 1. drive train 动力传动系 2. suspension system and axle 悬挂系统和驱动桥 3. brake system 制动系统 4. steering system 转向系统
机械电子类专业英语概要
1 机械专业英语词汇约会 金属切削 调查 机床 金属工艺学 刀具 摩擦 联结 传动 轴'?]/ 弹性[?s'?] 频率特性 误差 响应 定位 机床夹具[d?iɡ] 动力学 运动学[?n?'m?t?k] 静力学 分析力学['k?] 拉伸 压缩 剪切 扭转 弯曲应力 强度 三相交流电 磁路 变压器 异步电动机['??n?s] 几何形状 精度['??n] 正弦形的 交流电路['s?] 机械加工余量 变形力 变形 应力 硬度['d??]
退火[?'] 正火['n???] 脱碳[ɑ?r?'??n 渗碳 电路 半导体元件[?n'd??]反馈 发生器 直流电源 门电路 逻辑代数 外圆磨削 内圆磨削 平面磨削 变速箱 离合器[?t?] 绞孔 绞刀['?m?(r)] 螺纹加工 螺钉 铣削 铣刀 功率 工件 齿轮加工 齿轮 主运动 主运动方向 进给方向 进给运动 合成进给运动 合成切削运动 合成切削运动方向 切削深度 前刀面 刀尖 前角 后角 龙门刨削 主轴['] 主轴箱
2 加工中心 车刀 车床 钻削镗削 车削 磨床 基准 钳工 锻 压模 焊 拉床 拉孔 装配 铸造 流体动力学 流体力学 加工 液压?'?l?k]/ 切线['t???] 机电一体化 ['ɡ??n] 气压 稳定性 介质 液压驱动泵[?t?]离合器；控制；手；紧急关头液压泵[p?] 阀门[v?] 失效 强度 载荷 应力 安全系数['f??] 可靠性 螺纹 螺旋['] 键[] 销 滚动轴承 滑动轴承 弹簧 制动器
十字结联轴节 联轴器 链 皮带 精加工 粗加工 变速箱体 腐蚀 氧化 磨损 耐用度 随机信号 离散信号 超声传感器 集成电路 挡板 残余应力 套筒 扭力 冷加工 电动机 汽缸 过盈配合 热加工 摄像头 倒角 优化设计 工业造型设计 有限元 滚齿 插齿 伺服电机 铣床 钻床 镗床 步进电机 丝杠 导轨 组件 可编程序逻辑控制器 电火花加工 电火花线切割加工-
汽车制动系统(机械、车辆工程毕业论文英文文献及翻译)
Automobile Brake System汽车制动系统 The braking system is the most important system in cars. If the brakes fail, the result can be disastrous. Brakes are actually energy conversion devices, which convert the kinetic energy (momentum) of the vehicle into thermal energy (heat).When stepping on the brakes, the driver commands a stopping force ten times as powerful as the force that puts the car in motion. The braking system can exert thousands of pounds of pressure on each of the four brakes. Two complete independent braking systems are used on the car. They are the service brake and the parking brake. The service brake acts to slow, stop, or hold the vehicle during normal driving. They are foot-operated by the driver depressing and releasing the brake pedal. The primary purpose of the brake is to hold the vehicle stationary while it is unattended. The parking brake is mechanically operated by when a separate parking brake foot pedal or hand lever is set. The brake system is composed of the following basic components: the “master cylinder” which is located under the hood, and is directly connected to the brake pedal, converts driver foot’s mechanical pressure into hydraulic pressure. Steel “brake lines” and flexible “brake hoses” connect the master cylinder to the “slave cylinders” located at each wheel. Brake fluid, specially designed to work in extreme conditions, fills the system. “Shoes” and “pads” are pushed by the slave cylinders to contact the “drums” and “rotors” thus causing drag, which (hopefully) slows the c ar. The typical brake system consists of disk brakes in front and either disk or drum brakes in the rear connected by a system of tubes and hoses that link the brake at each wheel to the master cylinder (Figure). Basically, all car brakes are friction brakes. When the driver applies the brake, the control device forces brake shoes, or pads, against the rotating brake drum or disks at wheel. Friction between the shoes or pads and the drums or disks then slows or stops the wheel so that the car is braked.
财务管理专业英语期末复习
财务管理专业英语期末重点 一、单词 Topic1 财务管理financial management 资本预算capital budgeting 资本结构capital structure 股利政策dividend policy 存货inventory 风险规避risk aversion 股东权益stockholder s’ equity 流动负债current liability Topic2 财务风险financial risk 合伙制企业partnership 私人业主制企业sole proprietorship 收入revenue 主计长controller 财务困境financial distress 股票期权stock option 首次公开发行股票(IPO) initial public offering Topic 3 盈利能力profitability 偿付能力solvency 利润表income statement 有价证券marketable securities 提款withdrawal 应收账款accounts receivable 递延税款deferred tax Topic4 流动性比率liquidity ratio 权益乘数equity multiplier 资产收益率(ROA) return on assets 毛利gross profit margin 权益报酬率return on equity 市盈率P/E ratio 杠杆比率leverage ratio 息税前盈余(EBIT) earnings before interest and taxes Topic5 货币时间价值time value of money 年金annuity 折现率discount rate 机会成本opportunity cost
车辆工程专业英语
UNIT 5 FUEL INJECTION SYSTEM 燃油喷射系统 Fuel injection systems have been used on vehicles for many years. The earliest ones were purely mechanical. As technology advanced, electronic fuel injection systems became more popular. Early mechanical and electronic fuel injection systems did not use feedback controls. As emissions became more of a concern, feedback controls were adapted to both types of fuel injection systems. feedback control 反馈控制 As emissions became more of a concern 随着排放越来越受到关注 were adapted to 被应用于 Both mechanical and electronic fuel injection systems can be found on gasoline engines. Diesel engines are most commonly found with mechanical type systems, although the newest generations of these engines have been using electronic fuel injection(EFI) . gasoline engines 汽油发动机 diesel engines 柴油发动机 newest generations of 最新的 5.1 Basic Theory EFI uses solenoid valves called injectors to meter fuel delivery. Most vehicles today use 1 injector per cylinder. When the solenoid is energized, fuel sprays out into the valve port. Fuel is delivered to the injector by a high-pressure electric pump at around 40 psi. Fuel delivery is controlled by the injectors which are cycled by the computer. The computer produces a signal to open the injectors for a certain length of time depending on engine conditions relayed by sensors. The longer that the injector is open, the more fuel is injected. As engine load and rpm are increased, the injector open times are increased to match increasing airflow. This computer output signal is called the injector pulse width. The longer the pulse width, the more fuel is injected. solenoid valves 电磁阀 injector 喷油嘴，喷油器，喷射器 fuel delivery 燃油输送，燃油供给 is energized v. 使通电,供能, 激发，加强adj. 通电的，激励的,增能的energized line 带电电路，带电线路 valve port 阀口，喷油嘴 psi [psai] 每平方英寸….磅=pounds per square inch are cycled by 周期性控制 engine conditions relayed by sensors 传感器传送/输送回来的信号体现的发动机工作状况，简单的说，即：传感器信号体现的发动机工作状况 injector pulse width 喷油器脉冲宽度 5.3 Fuel System 5.4 Air Metering and Measurement 5.5 Most EFI systems measure the same basic 6 input
2019年车辆工程专业毕业论文_外文翻译1.doc
Drive force control of a parallel-series hybrid system Abstract Since each component of a hybrid system has its own limit of performance, the vehicle power depends on the weakest component. So it is necessary to design the balance of the components. The vehicle must be controlled to operate within the performance range of all the components. We designed the specifications of each component backward from the required drive force. In this paper we describe a control method for the motor torque to avoid damage to the battery, when the battery is at a low state of charge. Society of Automotive Engineers of Japan, Inc. and Elsevier Science B.V. All rights reserved. 1. Introduction In recent years, vehicles with internal combustion engines have increasingly played an important role as a means of transportation, and are contributing much to the development of society. However, vehicle emissions contribute to air pollution and possibly even global warming, which require effective countermeasures. Various developments are being made to reduce these emissions, but no further large improvements can be expected from merely improving the current engines and transmissions. Thus, great expectations are being placed on the development of electric, hybrid and natural gas-driven vehicles. Judging from currently applicable technologies, and the currently installed infrastructure of gasoline stations, inspection and service facilities, the hybrid vehicle, driven by the combination of gasoline engine and electric motor, is considered to be one of the most realistic solutions. Generally speaking, hybrid systems are classified as series or parallel systems. At Toyota, we have developed the Toyota Hybrid System (hereinafter referred to as the THS) by combining the advantages of both systems. In this sense the THS could be classified as a parallel-series type of system. Since the THS constantly optimizes engine operation, emissions are cleaner and better fuel economy can be achieved. During braking, Kinetic energy is recovered by the motor, thereby reducing fuel consumption and subsequent CO 2 emissions. Emissions and fuel economy are greatly improved by using the THS for the power train system. However, the THS incorporates engine, motor, battery and other components, each of which has its own particular capability. In other words, the driving force must be generated within the limits of each respective component. In particular, since the battery output varies greatly depending on its level of charge, the driving force has to be controlled with this in mind. This report clarifies the performance required of the respective THS components based on the driving force necessary for a vehicle. The method of controlling the driving force, both when the battery has high and low charge, is also described. 2. Toyota hybrid system (THS) [1,2] As Fig. 1 shows, the THS is made up of a hybrid transmission, engine and battery. 2.1. Hybrid transmission The transmission consists of motor, generator, power split device and reduction gear. The power split device is a planetary gear. Sun gear, ring gear and planetary carrier are directly connected to generator, motor and engine, respectively. The ring gear is also connected to the reduction gear. Thus, engine power is split into the generator and the driving wheels. With this type of mechanism, the