POLO 5 1.2TSI 引擎.docx

This 1.2-liter 77kW TSI engine replaces the 1.6-liter 75kW engine with port injection.Opposite him, he achieved much improved performance, with significantly reduced fuel consumption and thus lower CO2 emissions. The issue of CO2 emissions has become an important factor contributing to the purchase of the customer.Volkswagen consistently pursued its strategy TSI and continues with the new 1.2 liter TSI engine, the success story of this engine family. The further development of engine technology this small but powerful engine series is based on consistent performance tuning, and lightweight.The engine with a new aluminum cylinder block and a newly developed combustion system combined response, consumption and costs for volume engine from Volkswagen.On the following pages we present the design and function of the new 77kW 1.2-liter TSI turbocharged engine before.For more information about motor mechanics and engine management, see theSelf-Study 405 The 1.4-liter 90 kW TSI engine with turbocharger.The 1.2 liter turbocharged engine with 77kWThe basis for this engine is the 1.4-liter 90 kW TSI engine with turbocharging.In developing the 1.2-liter TSI engine, 77kW, three objectives were to the fore:- Reduce the weight of the 1.4-liter 90 kW TSI engine,（相比90KW的1.4TSI减轻重量）- To reduce the internal friction and（降低内部摩擦）- To develop a swirl combustion process(开发一个旋转燃烧模式)The technical characteristics（技术特点） A newly-developed aluminum cylinder block with cast iron cylinder liners innovative新开发的带铸铁缸套的铝合金缸体 The 2V cylinder head with inclined overhead valves and valve train with roller cam, timing chain (valve angle 12 , roof combustion chamber)倾斜的双顶置气门由链条带动的滚柱式凸轮驱动（位于燃烧室顶部的气门倾角12） A steel crankshaft with 42mm conrod and reduced to the main bearing diameters钢制曲轴主轴直径降至42毫米 A lightweight low-friction piston group with a ring set with reduced tangential(轻量化低摩擦的活塞组，降低切向摩擦力) An oil circuit with reduced oil flow rate and an oil pump with optimized efficiency（机油流动速率可调节，效率优化的机油泵） A turn-off coolant pump（冷却泵可关闭） A shared, service-lightweight control box with covers made of plastic and Magnesium（共用的轻量化服务控制箱（正时罩盖），由塑料和镁合金构成）An exhaust gas turbocharger boost pressure module with electric plate（由电机控制的增压压力调节）A in the cylinder block and cylinder head with integrated crankcase ventilation oil separation（集成于缸体和缸盖中的油气分离器） An ignition transformer（点火变压器）The technical dataTorque and power graphMaximum torque of 175nm is achieved at a speed of 1550-4100 1/min. Thus, the torque is at 1550 1/min to about 45% on the previous engine.The maximum power of 77kW 1/min made the engine at a speed of 5,000.Engine code： CBZBType： 4-cylinder in-line engineDisplacement： 1197cm3Bore： 71mmStroke： 75.6 mmvalves per cylinder： 2Compression ratio： 10: 1max. Power： 77kW at 5000 R/minmax. torque： 175nm at 1550-4100 1/minengine management： Continental Simos 10fuel： Super unleaded with RON 95Aftertreatment：Three-way catalytic converter with Lambda controlemissions standard： EU5The engineWith constructive measures for weight reduction has the weight of the engineHowever, the reduction of friction and the new combustion processes contribute to the achievement of development objectives.TotalAuxiliaryControl BoxCylinder head with valve trainCrankshaftCylinder BlockWeight balance comparedThe two-control caseThe control box consists of two parts.The top cover is made of plastic and can be degraded by one.The lower cover is made of magnesium die casting. It is fastened with special screws made of aluminum alloy and without removing the cylinder head can be reduced.uncoated aluminum screwsThe cylinder blockThe cylinder block is made of aluminum die casting. This is his weight against the cylinder block of cast iron with lamellar graphite, as used in the 1.4 l 90 kW TSI engine, 14.5 kg lighter.As in the 1.4-liter 90 kW TSI engine cylinder block is designed as open-deck construction.This means that there are no bridges between the outer wall and the cylinder tubes.(缸体和缸筒之前没有连接点，全空)This has two advantages:- It can be formed in this area, no air bubbles that would particularly lead to the dual-circuit cooling system ventilation and cooling problems.- In case of bolting the cylinder head with the cylinder block, the cylinder deformation due to the decoupling of the cylinder tube and cylinder block smaller and more uniform than in a closed-deck design with webs. This leads to reduced oil consumption, as the piston rings can compensate for this reduced deformation better.（开放式的结构，使得变形更小、更整齐，这样可以减小机油消耗，因为活塞环可以更好的应对这种情况）The gray cast iron cylinder linersThe cast-cast iron cylinder liners have the cylinder block through a groove profile with an undercut.This profile provides a solid, permanent bond (interlocking) between the cylinder block and cylinder liners.This leads to a lower rate of the cylinder block. In addition, an uneven heat distribution, as occurs in gray cast iron cylinder liners without undercut by gap formation, is avoided.The valve and crankOn the crankshaft and valve train, a number of measures have been implemented to reduce the friction and the weight and increase the rigidity of the crankshaft.The valve- The valve is of the 4-valve switched to the 2-valve technology.- The camshaft bearing is reduced to further reduce friction and weight savings- The clamping and sliding rails could be executed because of the two-valve technology with low-friction, large radiiThe camshaft is driven via a maintenance-free chain drive. The tension of the chain is effected by a hydraulic chain tensioners. It expresses the tension below the camshaft wheel rail against the chain.The clamping of the rail opposite side rail prevents the chain vibrates too much.The crank- The diameter of the crankshaft and the connecting rod bearings are reduced to 42mm.- To increase the rigidity of the crankshaft, the width dimension of the crankshaft and conrod bearings.- In the critical bending area of the crankshaft cheeks are made wider.- The piston rings have a lower tangential stress.The swirl portDue to a two-valve technology has been developed for a very good mixture formation a new swirl combustion process.In the intake port is designed so that the air flows in a rotating movement in the cylinder. Together with the valve masking results in a strong swir