Total Performance Analysis Of Great Wall GW Diesel Engine Matched With SING 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 engine and chassis are often made from different factories. So how to fulfill the best compatible 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 matching of the entire vehicle. Vehicle dynamic, emission and fuel economy performance not only depend on the engine performance, but also on the transmission parameters selection and the power train matching. Even with a good engine performance, it can not make full use of their properties without matching the reasonable transmission system. A reasonable transmission can make the engine often works in the ideal region. It can not only improve the fuel economy performance, reduce the engine abrasion, enhance the engine use life, but also improve the emission performance.Currently, the new standard about fuel tax is based on displacement of engine. The displacement above 2.5T you should pay more tax, the displacement below 1.2T you needn't to pay for any tax. Therefore considered the Great Wall GW2.8T Diesel CC6510SC1 RUV used actual situation of common stalls and used speed of this vehicle, then study on the entire vehicle matching between the engine and automobile of the dynamical characteristic and fuel economic characteristic. With the original race chassis parameters remain unchanged, GW2.5TCI engine will be matched to the original chassis of the vehicle and then performance on the comprehensive evaluation purposes so that it can reach or approach the level of the original car.First, 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 establishment of the driving cycle, that is to say, the driving cycles of the vehicle must like the vehicle's real world driving condition, the second question is the simulation model of the vehicle should be approached to the real vehicle. To assure the great precision of the model, the software of GT-DRIVE developed by CD-adapco Company in Japan for total car performance simulation is used for establishing the entire vehicle model, the paper also introduces the main functions; application range and specific operation process of GT-DRIVE, and introduces the part model too. Simulation software solves complex and precise mathematical models, such as the dynamic model, kinematics model and static model, and than calculated results. The original car model simulation results of high precision, and its dynamical characteristic and fuel economic characteristic compared to experimental results within the scope of permitted error.Second, we must make GW2.5T on the engine performance optimization ,by match cooler, match supercharger, as well as the circulatory system of EGR matching between engine, Drawing engine performance and the power curve of a million plans to analysis and evaluation after match the impact of the engine about dynamic fuel consumption and emissions, we can see match cooler can appropriate for the improvement of engine compression ratio, the improvement of low-speed power output; At the same time due to the density of cold air, so under the same conditions, can improve the engine inlet density, higher efficiency engine. And variable cross-section and the engine supercharger reasonable matching engine can take into account characteristics of low-speed and high-speed operation and expansion of low fuel consumption, improve engine and the acceleration of the transient response. Electronically Controlled EGR can effectively reduce NOx emissions.Compared to the original vehicle performance simulation results, the performance of new vehicle evaluation of simulation results were analysis. Because 0-100 Km/ h speed up time can be very good starting performance vehicle, 50-90 Km / h acceleration time to reflect overtaking performance, the status of the NEDC can be more true reflection of the status of the vehicle used. Therefore establish the model and then obtain the simulation results of evaluation index. Through dynamic contrast maximum speed indicators decreased 3.6 percent, the biggest climbing degrees from 39 percent to 35.4 percent, accelerating time from 0 to 100 km/s increased 3.4, direct acceleration time increased 2.8 s. Small decline in the dynamic characteristic ,economic indicators NEDC fuel consumption decreased 12.48%.So weigh practical vehicle performance and fuel tax can be reduced .Based on the study in comparison with the final result of optimization than the original car, and dynamic characteristic has not decreased and can meet the utility requirement, the larger economy have improved at the same time reduce also reduce the fuel tax, many users economical and practical to use this can. Properties of NOx emissions, HC emissions cycle status to meet Euro III standards, for CO can be improved by post-processing system...