Research Of Joint Work Characteristic Of Engine And Torque Converter In CVT Vehicle

At the present time, the majority of transmissions used in the automobile aremanual transmissions in our country. This kind of transmission needs the driver'sshift in high frequency, so the driver is easy to be tired and ultimately affects thesafety of driving. And different level of driving has big influence on economy offuel, power and comfort performance. In a word, Automatic transmission is ourperpetual pursue and is a significant sign of evolution of vehicle.Continuously automatic transmission is automobile's ideal transmission, it canadjust the position of automotive engine operating points, thereby enhancesvehicle's power and economy, decreases the pollution of waste. At the same timeleads to predigestion of automobilism operation, not only alleviates driver'sintensity of labour, but also decreases vehicle's driving impact. Because CVT isthrough friction transfer power, starting ability is bad and can not obtain neutralthat velocity ratio is zero, so starting device became CVT's indispensable importanttransmission part. Compared to other shift mode, although CVT hardly at the timeof starting and transfer driving direction, but as all transmissions, the performanceof its starting device is also one of challenge key technology of CVT transmissionsystem.Because torque converter possesses the function of automatically transfertorque and adaptation the variety of running resistance, so far it is still known asthe best starting device of automobile. The suit of torque converter and CVT canimprove vehicle's starting ability, low speed and climbing driving ability, thusadvance comfortable of driving. At different kinds of road conditions it canguarantee vehicle start easily, engine don't flameout, and at the same time controlis also changed simple. So it is extensively used in the second generation of CVT.The rational matching and control of torque and engine is the key to advancevehicle starting ability and driving comfortable and driving economy. Presentwriter at the basic of engine characteristic test and torque converter characteristictest, discuss the performance of joint work and influencing factors of vehiclengine and torque converter in CVT. The main contents of the text are as follows:1. Analyze the importance of used torque converter in CVT, introduce theflow of control of engine + torque converter + CVT system, then present theevaluation criteria of joint work of engine and torque converter, then, definitude themain study contents of this text.2. Present the impact of engine characteristic to engine and torque converterjoint work characteristic , then according to the correlative provision of18297-2001 proceedaggregate capacity test and universal characteristic test, analyze the extraneousfactors that impact engine performance, and modification process the test data. Useformula fitting process create motor mathematic model, then with motor torquemathematic model and oil waste mathematic model for foundation to drawn motoruniversal characteristic curve. For the analyses of joint work characteristic ofengine and torque converter supply prior condition.3. Introduce the work theory of torque converter, present the currencycharacteristic and primitive character of torque converter, present evaluating targetsto appraise six main performance of torque converter. Then according tostate-specified standards of (QC/T 557-1999) proceed operating characteristic test of torque converter.Expound testing method, equipment and major steps, and with the formal offlowchart specify program control course of utility characteristic test of torqueconverter. Then according to the formulae of torque converter make calculation,then, obtain utility character diagram and primitive character curve of torqueconverter. At last, upon the main performance of torque converter, with the form ofparametric appraise the performance of torque converter.4. Put forward matching principle and standard of engine and torque converter,and expound four kinds of important method that realize engine and torqueconverter suited. Then create mathematical model of engine and torque converterseparately, and according to engine universal characteristic that obtained throughtest based 18297-2001 < The method for testing performance of automotiveengine> and torque converter primitive character that obtained through test based...