The Total Performance Analysis Of Yuchai YC4W Diesel Engine Matched With Vele Chassis

With the development of automobile industry and the consciousness of environmental protection becoming strengthened, higher demands are brought forward for automobile drive ability, economy and emission performance. In china, manufacturing is divided so detailed that engines and chassis are often made from different factories. So how to fulfill the best compatibility between engine and chassis to make the automobile own better drive ability, economical and emission performance become very important in the process of studying the match of the vehicle.Driving performance and fuel economy not only depend on the engine performance, but also on the selection of transmission parameters and the power train matching. Engine and power train are two important elements, which are fetal to the normal running. The matching between them will directly affect the performance and fuel economy. The vehicle transmission parameters should be optimized to make the engine work almost in the low-fuel consumption region when it operates in the real driving modes. To improve the design quality and short the development period, the prospect about the dynamic and economic characteristics should made according to the reference parameters in the design stage, and the computer simulative computation supplies it with the effective and precise tools along with the wide use of computer and development of modern computation method.There are two kinds of design on matching between engine and power train. One is that optimizing the engine if the power train is given in advance. According to the given task, the thesis analyzes the match performance between YC4W75-30 diesel engine and the car chassis of Vele1.3MT, optimizes the Vele chassis powertrain system, and improves the power and emission characteristics in a great deal. From the automobile theory, the extent of the power-transmission matched with the vehicle driving cycle has a major influence on the performance of the vehicle. So in order to simulate the performance of the vehicle, two problems must be resolved: the first question is the selection of the driving cycle, that is to say the driving cycles of the vehicle must like the vehicle's real word driving condition; the second question is the simulation model of the vehicle should be approached to the real vehicle. The cycle operation used in the simulative computation is the New Europe CycleOperation, which is comprised of urban district and suburb operation cycles, and about 2/3 is the simulated town road conditions, the other 1/3 is the suburb highway condition. The test proved that the New Europe Cycle Operation could reflect the distribution of the engine operation points greatly in actual driving, which lays the base for improving the car performance further. To assure the great precision of the model, the software Cruise developed by AVL company for total car performance simulation is used for establishing the car physical model。The software Cruise for...