论文部分内容阅读
建立了一个预测二冲程增压中冷柴油机动态响应特性的详细模型,该模型是一台原型机车驱动系统综合模拟系统的组成部分。该模型中柴油机燃油供应和制动扭矩是用回归方程计算的,该方程是以大量数据为基础导出的。为了考虑由稳态值求出的缸内空燃比的动态偏差,对稳态扭矩计算值加了修正系数。柴油机模拟过程精确地反映了涡轮增压器的运行情况,该增压器在其低转速下由齿轮驱动,而当排气能量使涡轮增压器加速而超过齿轮驱动转速时,超速离合器使增压器脱离齿轮而自由转动。柴油机供油值(即齿条值)由电控液压调速器的动态模拟过程确定,该调速器对柴油机转速期望值和实际值两者的差值作出响应。调速器模拟项目包括:(1)柴油机转速有限变化率;(2)负荷调节器反馈施加给柴油机的负荷,(3)负荷过高情况下的燃油限制。本文结合实例介绍柴油机调速器模型的基本情况。
A detailed model for predicting the dynamic response of a two-stroke turbocharged intercooled diesel engine is established. It is part of a comprehensive simulation system for a prototype locomotive drive system. Diesel fuel supply and braking torque in this model are calculated using the regression equation, which is based on large amounts of data. In order to consider the dynamic deviation of the in-cylinder air-fuel ratio obtained from the steady-state value, a correction coefficient is added to the calculated steady-state torque value. The diesel engine simulation accurately reflects the operation of the turbocharger, which is driven at its low speed by a gear and when the exhaust energy accelerates the turbocharger beyond the gear-driven speed, the overdrive clutch increases The pressure roller rotates freely away from the gear. Diesel fuel supply values (ie, rack values) are determined by the dynamic simulation of an electrically controlled hydraulic governor that responds to the difference between the expected and actual diesel engine speed. The governor simulation project includes: (1) a limited rate of change of diesel engine speed; (2) a load regulator feeding back the load applied to the diesel engine; and (3) a fuel limit in the event of an overloaded condition. This article introduces the basic situation of diesel governor model with examples.