基于多目标的城市交通微循环系统优化模型研究

定义了交通微循环系统的概念,在此基础上分析了交通微循环功能特性,从分流干道交通、疏解交通拥堵、提供安全舒适出行的目标出发,构建了交通微循环多目标的双层规划模型,并运用多目标协同优化方法分析优化目标.上层模型在满足路段饱和度和最大改造能力的约束条件下,使交通微循环的可达性最高、投资费用最省、环境影响最小;下层模型采用动态均衡模型对交通流进行配流.并运用遗传算法对模型进行了求解.

Simulation Design for Transient Acceleration Conditions of Natural Gas Engine Based on Simulink

This paper builds engine model of natural gas engine under transient acceleration conditions by Simulink software. The inlet pressure correction module is added to the model. This model compensates for inaccuracy of inlet pressure measured by the pressure sensor under transient acceleration conditions, and implements accurate forecast of inlet pressure, and can also make transient acceleration conditions of the engine be controlled in the vicinity of the theoretical air-fuel ratio. Through closed-loop control of the speed, speed can be quickly stabilized around the target speed. The simulation results show that this model can well realize the air-fuel ratio control under transient acceleration conditions to achieve the purpose of fast and steady speed, which can provide certain reference for development of the engine electronic control unit.