共查询到20条相似文献,搜索用时 62 毫秒
1.
高速公路入口匝道控制的仿真研究 总被引:13,自引:1,他引:13
本文针对Markos Papageoriou的高速公路交通流宏观,动态,确定性效能流模型,从入口匝道流量对高速公路主线交通流影响的实质出发,通过对入口匝道可汇入量影响因素的详细分析,提出了独立的入口匝道控制和入口匝道联合控制两种控制策略,并以高速公路的总行程时间,总服务流量及入口匝道平均等待时间作为入口匝道控制效果评价的目标函数,将目标函数、交通流模型和入口匝道控制模型化为求解二个最优问题,最后利 相似文献
2.
高速公路动态交通流的建模与控制策略 总被引:10,自引:2,他引:8
从高速公路交通流的宏观、动态特性出发,首先给出了交通流控制和仿真中常用的宏观、动态、确定性交通流模型,并结合交通调查数据,利用仿真和优化技术对模型中的参数进行辨识,从而获得了能比较准确地描述了交通流真实行为的模型,然后提出了低密度区的可变速度控制,中密度区的可变限速和入口匝道联合控制及出口匝道分流和入口匝道协高控制模型,并给出了上三个问题的最估解,最后利用计算机模拟了受控和未控交通流,其结果令人满 相似文献
3.
高速公路交通流中等密度区的可变速度和入口匝道联合控制 总被引:2,自引:0,他引:2
本文在已建立的高速公路交通流宏观、动态、确定性模型的基础上,结合交通流中等密度区(15≤P≤Pcrit辆/公里/车道)流量大、车速高且存在潜在不稳定等特点,提出了高速公路交通流中等密度区的主线可变速度控制和入口匝道局部积分反馈联合控制策略,最后利用计算机仿真对控制效果了验证,结果表明,采用主线可变速度控制和入口匝道联合控制策略可以消除某些阻塞。 相似文献
4.
5.
6.
7.
8.
9.
10.
为改善整个快速路网的服务水平与通行能力,结合车辆在衔接段的交通运行特性,对城市快速路出入口匝道与平面交叉口衔接段的长度进行优化设计,并以雄楚大道为例,对部分出口匝道、入口匝道与相邻平面交叉口附近衔接段交通流进行调查和分析,采用VISSIM软件建立衔接段长度设计优化计算模型,对衔接段的交通流进行仿真模拟,并将输出指标进行对比。结果表明,在计算长度下,车辆在衔接段的行程时间、平均延误时间以及排队长度都有了较大改善,整体交通运行状态得到了较大提升。该结果验证了衔接段长度设计优化计算模型的合理性。 相似文献
11.
12.
该文介绍了建立企业内部控制制度的必要性及企业内部控制制度的基本结构,并着重阐述了在建立企业内部控制制度过程中应注意的几个关键问题。 相似文献
13.
14.
车身控制系统是整车控制的重要组成部分,采用分布式总线车身控制系统,各个模块具备独立的时钟,如何保证时钟同步成为分布式总线系统需要面临的问题。本文针对某车型分布式转向灯同步策略的研究,通过对分布式转向灯控制原理、控制逻辑的具体实现和分布式转向灯同步策略的具体实现方式进行深入研究及分析,最终保证分布式转向灯同步问题得以解决。 相似文献
15.
16.
17.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):321-337
In this article, a new drivetrain configuration of a parallel hybrid electric vehicle is considered and a novel model-based control design strategy is given. In particular, the control design covers the speed synchronisation task during a restart of the internal combustion engine. The proposed multivariable synchronisation strategy is based on feedforward and decoupled feedback controllers. The performance and the robustness properties of the closed-loop system are illustrated by nonlinear simulation results. 相似文献
18.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(2):215-236
In this paper, a systematic design with multiple hierarchical layers is adopted in the integrated chassis controller for full drive-by-wire vehicles. A reference model and the optimal preview acceleration driver model are utilised in the driver control layer to describe and realise the driver's anticipation of the vehicle's handling characteristics, respectively. Both the sliding mode control and terminal sliding mode control techniques are employed in the vehicle motion control (MC) layer to determine the MC efforts such that better tracking performance can be attained. In the tyre force allocation layer, a polygonal simplification method is proposed to deal with the constraints of the tyre adhesive limits efficiently and effectively, whereby the load transfer due to both roll and pitch is also taken into account which directly affects the constraints. By calculating the motor torque and steering angle of each wheel in the executive layer, the total workload of four wheels is minimised during normal driving, whereas the MC efforts are maximised in extreme handling conditions. The proposed controller is validated through simulation to improve vehicle stability and handling performance in both open- and closed-loop manoeuvres. 相似文献
19.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):1473-1494
Vehicle traction control system has been developed to enhance the traction capability and the direction stability of the driving wheels through the tyre slip ratio regulation. Under normal situations, if the tyre slip ratio exceeds a certain threshold, the slip ratio of the driving wheel is regulated by the coupled interaction of the engine torque and the active brake pressure. In order to obtain the best driving performance on a road under complicated friction conditions, the driving torque and the active brake pressure, need to be decoupled and adjusted to avoid penalisation of each other. In this paper, a coordinated cascade control method with two sliding-mode variable structure controllers is presented. In this control method, the driving wheel slip ratio is regulated by adjusting the engine torque and the wheel brake pressure. Through the sliding-mode controller, the engine torque is tuned to achieve the maximum driving acceleration and then the active brake pressure is applied to the slipped wheel for further modification of the wheel slip ratio. The advantage of this control method is that through proper regulation, the conflict between the two control inputs could be avoided. Finally, the simulation results validate the effectiveness of the proposed method. 相似文献