论文部分内容阅读
介绍柴油发动机上的传统直列式喷油装置优化设计程序的应用。该程序应用一套设计参数,分别涉及凸轮、高压油泵、出油阀、阻尼阀、高压油管及喷油器的设计。为了向目标喷油率靠近,将这些设计参数的值,同时在确定的最大值或最小值内进行优化。所推荐的优化设计程序是由目标函数和约束函数确定的一个非线性数学规划问题的一种解法。目标函数用来评价目标和实际喷油率间的差别,而约束函数则涉及该系统的响应以及一些技术边界条件。目标函数的形式需要作类似动态多体系统优化设计中使用的特殊处理。但当采用应用于动态系统的这些方法时,喷油装置的复杂性引起特殊的数值上的困难。介绍了如何改进常用方法来克服这些困难。本理论采用一个与常用的修正方法相比较的数字实例来加以说明。
This paper introduces the application of the optimization design procedure of the traditional in-line fuel injection device on the diesel engine. The program uses a set of design parameters that relate to the design of the cam, high pressure pump, delivery valve, damping valve, high pressure tubing and injector. In order to get close to the target injection rate, the values of these design parameters are optimized simultaneously within a certain maximum or minimum value. The proposed optimization design procedure is a solution to a nonlinear mathematical programming problem defined by the objective function and the constraint function. The objective function is used to evaluate the difference between the target and the actual fuel injection rate, while the constraint function relates to the response of the system and some technical boundary conditions. The form of the objective function requires special handling for similar dynamic multibody optimization design. However, the complexity of fuel injection devices poses particular numerical difficulties when using these methods applied to dynamic systems. Describes how to improve commonly used methods to overcome these difficulties. This theory uses a number of examples compared with the commonly used correction methods to illustrate.