共查询到20条相似文献,搜索用时 93 毫秒
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现如今汽车已经成为人们交通出行中必不可少的工具,在人们物质水平逐渐提升下,他们开始对汽车舒适感、便捷性和安全性提出了较高的需求,而汽车无钥匙进入系统的应用,不仅能够提高汽车的舒适性和便捷性,也能够提高汽车的安全性,让汽车能够更好地为人们提供服务.因此,本文围绕着RFID汽车无钥匙进入系统展开了探究,以期能够为人们开车出... 相似文献
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48VMicroBAS微混技术,是当前低成本实现混动、降低油耗和排放的主流技术.本文针对某48V微混车辆keyonstart(钥匙起动)的起动冲击问题,研究了48V微混的起动策略,通过对比分析起动机key on start(冲击较大)与48V电机auto start(无冲击)的起动策略与起动平顺性,开发了起动机与48... 相似文献
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汽车起动机是汽车起动的关键核心部件,也是车辆日常使用和维修中较为常见的故障点之一.基于汽车起动机的工作过程,做简化电路图分析,有利于汽车电器从业者以及汽车运用专业的学生一目了然的了解和掌握汽车起动机的结构和工作原理,为起动机的检修和使用提供便利. 相似文献
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本文在分析起动机工作原理基础上,开发出由工控机和可编程逻辑控制器(PLC)构成的两级计算机控制的测试系统,实现了起动机开关性能、空载性能、负载性能以及制动性能测试.针对起动机负载性能测试特点,采用PID控制器和模糊PID控制器分别控制电压和力矩,有效地确保测试控制精度和测试快速性. 相似文献
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复合功率分流系统发动机起动模型预测控制 总被引:2,自引:0,他引:2
复合功率分流混合动力系统从纯电动模式至电子无级变速(Electronic-continuously variable transmission,E-CVT)混合动力模式的切换过程,伴随发动机的起动。由于发动机在整个起动过程始终与传动系相连,其低速往复脉动阻力矩特性对车辆模式切换过程的驾驶平顺性有直接影响,若控制不当,常引起较大的车辆纵向冲击。针对复合功率分流混合动力系统模式切换过程,基于Matlab/Simulink平台建立传动系动态模型和发动机阻力矩模型;提出一种发动机起动模型预测优化控制策略,在线计算电机转矩拖转发动机跟踪目标最优转速曲线并补偿输出端转矩波动。离线仿真及硬件在环台架试验结果表明,所开发的发动机模型预测转速跟踪控制策略能够快速起动发动机并使车辆平稳切换,将整车纵向冲击度限制在11.0m/s3以内,且对整车参数摄动具有较好的鲁棒抑制效果。 相似文献
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卡车和乘用车不一样,驾驶室车身宽,但可布置的空间小,钣金件覆盖面多。提出了一种适用于卡车驾驶室的室内低频天线布置方案并进行了分析,仅用2根天线覆盖整个驾驶室,可以保证卡车无钥匙系统的性能,还可以节约整车制造成本。 相似文献
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Hong-youn Kim Young-min Yun Hoon Heo 《Journal of Mechanical Science and Technology》2016,30(9):4075-4081
A new approach to the control of electro-magneto-mechanical system is proposed in this paper. Conventionally, these systems are controlled based on the Maxwell system model via an on-off or PID control technique, which displays acceptable performance in the low frequency region, but not in the high frequency region where position control performance is greatly degraded. In order to improve the performance, a newly developed virtual 2nd order system modeling technique, SSID, is adopted for a complex electro-magnetomechanical system in the study. This technique states that any unknown system exposed to a random disturbance with unknown intensity can be identified in terms of a virtual 2nd order system model via the inverse process of a certain stochastic analysis. As a typical hybrid system, a solenoid valve is used as the target electro-magneto-mechanical system to study the modeling of the virtual 2nd order system. In order to confirm the performance of the proposed control strategy, autotuning PID controller in PWM mode is utilized. Simulations based on the conventional Maxwell system model with control via the bang-bang, autotuning PID, and the proposed virtual 2nd order system model approaches are conducted using MATLAB Simulink. Performance of these three systems in the low and high frequency bands is also compared. The simulation results reveal that the control performance of the virtual 2nd order system model is much improved compared with that of the Maxwell system model under autotuning PID and bang-bang controls in both low and high frequency regions, where the error is drastically reduced to approximately 1/5 of the original value. 相似文献
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高压钠灯是人工温室常用的光源,控制比较困难。结合模型预测控制策略,设计了高压钠灯连续调光二级控制系统。实验结果表明,在存在干扰情况下,系统仍能获得满意的控制效果。 相似文献
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Piezoelectric actuators present a promising option if actuation of small-sized robot joints is considered. They develop forces of several newtons at velocities in the cm/s range while their dimensions and weight remain small as compared to electric motors. This work presents an approach for modelling a class of contemporary, non-resonant translatory piezoelectric actuators. The proposed modelling approach results in three motor models of increasing complexity independently of the low-level piezoelectric properties of the driving elements. The basic model establishes a static relation between motor velocity and drive frequency for a free-moving motor. The second model is a non-linear extension of the first model which introduces external load forces. The final model introduces time-dependent aspects by employing system identification techniques. The final model is used to develop a force compensation mechanism which restores linearity in the motor operation even in the loaded case. Based on the linearised model, standard control design techniques are applicable to design an explicit force controller. Limits on the performance of the controller are derived. The actual performance of the controller is evaluated both in simulations and experiments by pulling on tendons of different elasticity. 相似文献
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提出一种基于三维CAD模型的机电系统仿真方法,以建立并验证控制系统的拓扑结构和控制逻辑。同时,通过基于三维模型的运动学仿真,可以发现复杂机电系统中的机械设计问题。仿真系统中编写的控制程序,只需要进行少量改动,就可以直接应用到实际设备中。运用该仿真系统可以显著缩短复杂机电装备的开发周期。 相似文献
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模型预测控制具有鲁棒性强、跟踪快速性好等特点,能够解决复杂工业过程控制中的大时滞问题。该文提出了一种改进的模型预测控制器,基于事先设定的期望响应,实现参考轨迹在预测时域内最大限度地渐进期望轨迹,使系统响应能够准确地跟踪期望轨迹。该文以硅单晶体加热炉为控制对象,分别采用PID、DMC和改进DMC三种控制方法进行预测控制。仿真结果表明改进的DMC控制方法比传统的预测控制方法具有更好的动态响应性能和跟踪效果。 相似文献
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基于TDLAS技术的在线气体检测系统评介 总被引:1,自引:0,他引:1
基于可调谐激光二极管吸收光谱技术的在线气体检测系统可用于分析工业过程气体浓度,具有无需采样预处理、响应速度快、不受背景气体和粉尘影响以及适应恶劣工业环境能力强等突出优势。本文在介绍运用波长调制技术的吸收光谱原理的基础上详细介绍该仪器的性能特点和组成结构。 相似文献
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基于内模电流控制的交流感应电机矢量控制系统 总被引:1,自引:0,他引:1
从同步速d—q坐标系下异步感应电机动态模型和异步电机矢量解耦控制的基本原理出发,引入了内模控制方法,设计了基于转子磁链定向和内模控制的定子电流调节器。考虑到实际系统中异步感应电机磁场会随着电机负载(转矩)变化而呈不同程度的饱和而导致电机参数的非线性,分析了电流内模控制器对这种非线性参数的鲁棒性。在此基础上建立了整个异步感应电机矢量控制仿真系统,并分别对忽略磁路饱和和考虑磁路饱和两种情况下的系统进行了仿真和分析。仿真和分析结果表明,电流内模控制调节器在模型匹配和失配下均能提供良好的转矩动、静态解耦效果。 相似文献