Study On Key Technology Of Fuel Economic Development

It is critically important to improve the vehicle fuel economy and reduce emission in the current situation that green life with low carbon is required. There are many traditional methods to reach this target, such as light weight design of body-in-white (BIW) and chassis, calibration of engine control unit, optimization of transmission ratio, etc. However, it usually focuses on a single aspect of these methods. Therefore, with the mission to save energy a fuel economic development process is established based on energy management and attributes integration technology. Driven by weight management, including target setting and cascading and lightweight design, technology and methods are investigated to save energy and reduce emission. Calibration for power train is developed for vehicle fuel efficiency. A sedan of A-class is successfully developed with low fuel consumption and high performance.The tasks contain(1)The concept of vehicle weight management and development is proposed, which follows the forward engineering process. The target is set by benchmark study and cascaded with top-down approach.(2) The target is achieved with bottom-up approach, step by step. The light weight design of BIW is accomplished by using new types of materials such as the long fiber glass plastics for the front end framework and the hot stamped ultra high strength steel for B pillar, and by computer simulation to optimize the sheet metal material thickness.(3) A fuel economic development process is established based on energy management and attributes integration technology. The target setting is guided by marketing. The target cascading and project development plan in early stage are driven by energy management. During styling design and packaging study the optimal design is investigated to reduce wind drag coefficient and mechanical resistance force, to shorten the energy transport path, and to reduce loss of the system kinetic energy.(4) In view of attribute integration, various appropriate energy saving technologies and fuel consumption reducing approaches are chosen by integrated balance and analysis.(5) Under the given boundary conditions a plan is found through calibration of vehicle fuel efficiency to reach the target with the best fuel economy and the satisfaction of emission, dynamics, and ride and handling.(6)Extensive simulation for design and test verification are performed for vehicle attributes including handling stability, NVH (Noise, Vibration, and Harshness), durability and reliability, environment comfort, crash safety, etc.The result of product application shows that the proposed process with the key technology and methods developed helps to achieve the target of fuel economy and satisfy high standard of many attributes as well. The product has overall better performance than the benchmark vehicle.