共查询到20条相似文献,搜索用时 171 毫秒
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<正>AMT手自一体化变速器是马涅蒂·马瑞利引以为豪的技术之一,该技术首次将电子控制与液压驱动整合在一起,即由电控单元驱动电磁阀,电磁阀驱动液压执行机构来实现自动换档和离合器动作,既减少了油耗、降低了排放,又大幅度提升了换档速度与舒适性等性能。 相似文献
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奥迪A6轿车电子节气门控制(EPE)系统主要由加速踏板位置传感器、节气门控制单元(包括步进电动机及节气门位置传感器)、发动机电控单元和EPC故障警报灯等组成。加速踏板位置传感器有2个,属于可变电阻式传感器,分别将加速踏板的移动量和移动速度转换成电信号输送给发动机电控单元;节气门位置传感器也有2个,同样属于可变电阻式的,分别将监测到的节气门开度转换为电信号输送给发动机电控单元。发动机电控单元用于处理信息和控制节气门,当EPC系统出现故障时,EPE故障警报灯进行报警。 相似文献
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排气制动的基本工作原理柴油汽车排气制动系统由储气筒、管路、电磁阀、排气制动阀及排气制动阀控制机构组成。制动时,放松加速踏板.打开排气制动开关.电磁阀产生吸力.关闭排气口。 相似文献
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针对电控空气悬架在车高调节过程中存在的过充,过放以及震荡等不良现象和加速、减速、转弯以及路面随机干扰对整车姿态的影响,根据变质量充放气系统热力学理论,提出一种能够对气体质量流量进行自适应快速调节的单神经元PID控制方法。根据车辆动力学理论,建立了加速、减速、转弯以及路面随机干扰下的空气悬架车身高度调节系统整车模型。基于神经网络控制算法,设计了车身高度调节的单神经元PID控制器和整车姿态控制的BP神经网络PID控制器。为检验所设计控制器的性能,搭建了Matlab/Simulink车身高度控制仿真模型和整车姿态控制仿真模型。仿真结果表明所设计的控制系统不仅能够实现车身高度的有效调节,同时还能抑制车身高度调节中的整车姿态变化。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(1):139-164
Progress in reducing actuator delays in pneumatic brake systems is opening the door for advanced anti-lock braking algorithms to be used on heavy goods vehicles. However, little has been published on slip controllers for air-braked heavy vehicles, or the effects of slow pneumatic actuation on their design and performance. This paper introduces a sliding mode slip controller for air-braked heavy vehicles. The effects of pneumatic actuator delays and flow rates on stopping performance and air (energy) consumption are presented through vehicle simulations. Finally, the simulations are validated with experiments using a hardware-in-the-loop rig. It is shown that for each wheel, pneumatic valves with delays smaller than 3 ms and orifice diameters around 8 mm provide the best performance. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4-5):267-284
For the control of anti-lock brake system (ABS), a longitudinal four-wheel vehicle model with brake actuator is described and a sliding mode controller with pulse width modulation (PWM) method has been developed for passenger vehicles. In our research, we introduce actuator dynamics of solenoid-solenoid valve type in system equation and derive the sliding mode control input theoretically. We propose using PWM method to compensate for the discrete nature of actuator dynamics by duty control. The effectiveness of the proposed control algorithms was confirmed by vehicle test on an in-door test bench that was specially constructed for the purpose concerned. 相似文献
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Control of Wheel Slip Ratio Using Sliding Mode Controller with Pulse Width Modulation 总被引:3,自引:0,他引:3
Seongho Choi Dong-Woo Cho 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1999,32(4):267-284
For the control of anti-lock brake system (ABS), a longitudinal four-wheel vehicle model with brake actuator is described and a sliding mode controller with pulse width modulation (PWM) method has been developed for passenger vehicles. In our research, we introduce actuator dynamics of solenoid-solenoid valve type in system equation and derive the sliding mode control input theoretically. We propose using PWM method to compensate for the discrete nature of actuator dynamics by duty control. The effectiveness of the proposed control algorithms was confirmed by vehicle test on an in-door test bench that was specially constructed for the purpose concerned. 相似文献
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线控制动系统防抱死特性模糊控制方法的仿真研究 总被引:2,自引:1,他引:2
作者研究分析了直接影响汽车行驶安全性能的汽车制动系统的重要组成部分,阐述了以油或空气作为传力介质的传统制动系统必将被全电的制动系统——线控制动系统所取代,线控制动系统是未来制动系统的发展方向。介绍了线控制动系统的分类、结构和工作原理;建立了线控制动系统和制动执行器的数学模型,以1/4车辆模型为研究对象,设计了模糊控制器,并在Matlab/Simulink下进行了仿真分析。仿真结果表明,模糊控制对线控制动系统的防抱死特性取得了理想的控制效果。 相似文献
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Andrew Alleyne 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1997,27(3):157-186
This paper investigates the use of several different inputs for the control of a vehicle, in the context of URD. In this investigation, the goal of the URD controller is to provide an intervention in the event of the vehicle leaving the road. The types of inputs that will be considered are (i) Four Wheel Steering, (ii) Front Wheel Steering, (iii) Four Wheel Brake Steering, (iv) Front Wheel Brake Steering, and (v) Rear Wheel Brake Steering. The controller design is an LQ controller based on the simplified dynamics of a 2 degree of freedom bicycle model. However, the analysis of the different strategies are performed on a 7 degree-of-freedom nonlinear vehicle model. The key contribution of this paper is the quantitative evaluation of the relative efficiencies of each of these input strategies being examined. Unlike most control schemes, the performance measure to be used will not be the output tracking error of the system. Instead, the metric of performance is the ratio of peak tire force used versus available tire force or, in other words, the actuator response relative to the maximum available actuator capability. 相似文献
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不规范改装中央门锁对车辆安全带来许多隐患。文章通过对汽车改装中央门锁的现状和数据分析,从4个方面阐述了车辆不规范改装中央门锁对车辆安全性能的影响,并对其管理措施和检验标准进行了探讨和研究。指出:建议制定汽车安装中央门锁装置的相关标准细则、将汽车中央门锁装置列入对在用车机动车年度审验的安全检验项目及改装后的车辆必须满足的4项要求。提高汽车中央门锁的改装质量,对预防和减少道路交通事故隐患具有重要的现实意义。 相似文献
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介绍一种用于铰接式自卸车的转向流量阀,通过对其结构的分析,得出了其流量放大的原理,从而解决了铰接式自卸车使用普通的液压转向装置,无法为转向执行元件提供足够流量的难题,保证了铰接式自卸车正常安全实现转向. 相似文献