Design and Analysis of Power and Transmission System of Downhole Pure Electric Command Vehicle

Electric vehicles use electric motors, which turn electrical energy into mechanical energy. As electric motors are conventionally used in all the industry, it is an established development site. It’s a mature technology with ideal power and torque curves for vehicular operation. Conventional vehicles use oil and gas as fuel or energy storage. Although they also have an excellent economic impact, the continuous use of oil and gas threatened the world’s reservation of total oil and gas. Also, they emit carbon dioxide and some toxic ingredients through the vehicle’s tailpipe, which causes the greenhouse effect and seriously impacts the environment. So, as an alternative, electric car refers to a green technology of decarbonization with zero emission of greenhouse gases through the tailpipe. So, they can remove the problem of greenhouse gas emissions and solve the world’s remaining non-renewable energy storage problem. Pure electric vehicles (PEV) can be applied in all spheres, but their special implementation can only be seen in downhole operations. They are used for low noise and less pollution in the downhole process. In this study, the basic structure of the pure electric command vehicle is studied, the main components of the command vehicle power system, namely the selection of the drive motor and the power battery, are analyzed, and the main parameters of the drive motor and the power battery are designed and calculated. The checking calculation results show that the power and transmission system developed in this paper meets the design requirements, and the design scheme is feasible and reasonable.

Research and Development of Engine-Generator Set Control System for Tracked Vehicle Electric Transmission System

As an energy generating equipment, the engine-generator set supplies power to the electric transmission. Therefore, its control is one of the key technologies of electric vehicles. Based on the discussion about the demands to the engine-generator set in tracked vehicles, the detailed function of engine-generator and the control strategy are determined. The hardware and software of the control system are also developed and tested in a prototype vehicle. The experiment results show that the control system has good reliability and can satisfy the power requirements of vehicles under all operating conditions.

Control and Simulation of Continuously Variable Transmission for Electric Transmission System

According to the study of electric transmission, the concept of the fore and the aft power chain is presented. The control method of continuously variable transmission is established in the aft chain of electric transmission based on brushless DC motor. A fuzzy controller is designed with continuous fuzzy variables and the simulation module of the aft power chain is proved by test. The fuzzy controller controls the process of continuously variable transmission steadily and the acceleration of vehicle is quick according to simulation results. The elementary performance exhibited in the simulation is a foundation for the further study of the electric transmission track vehicle.

Design and application of electric oil pump in automatic transmission for efficiency improvement and start–stop function

For the purpose of improving efficiency and realizing start–stop function, an electric oil pump(EOP) is integrated into an 8-speed automatic transmission(AT). A mathematical model is built to calculate the transmission power loss and the hydraulic system leakage. Based on this model, a flow-based control strategy is developed for EOP to satisfy the system flow requirement. This control strategy is verified through the forward driving simulation. The results indicate that there is a best combination for the size of mechanical oil pump(MOP) and EOP in terms of minimum energy consumption. In order to get a quick and smooth starting process, control strategies of the EOP and the on-coming clutch are proposed. The test environment on a prototype vehicle is built to verify the feasibility of the integrated EOP and its control strategies. The results show that the selected EOP can satisfy the flow requirement and a quick and smooth starting performance is achieved in the start–stop function. This research has a high value for the forward design of EOP in automatic transmissions with respect to efficiency improvement and start–stop function.

Explosive Electric Actuator and Control for Legged Robots

Unmanned systems such as legged robots require fast-motion responses for operation in complex envi-ronments.These systems therefore require explosive actuators that can provide high peak speed or high peak torque at specific moments during dynamic motion.Although hydraulic actuators can provide a large force,they are relatively inefficient,large,and heavy.Industrial electric actuators are incapable of providing instant high power.In addition,the constant reduction ratio of the reducer makes it difficult to eliminate the tradeoff between high speed and high torque in a given system.This study proposes an explosive electric actuator and an associated control method for legged robots.First,a high-power-density variable transmission is designed to enable continuous adjustment of the output speed to torque ratio.A heat-dissipating structure based on a composite phase-change material(PCM)is used.An integral torque control method is used to achieve periodic and controllable explosive power output.Jumping experiments are conducted with typical legged robots to verify the effectiveness of the proposed actuator and control method.Single-legged,quadruped,and humanoid robots jumped to heights of 1.5,0.8,and 0.5 m,respectively.These are the highest values reported to date for legged robots powered by electric actuators.

OPTIMAL TORQUE CONTROL STRATEGY FOR PARALLEL HYBRID ELECTRIC VEHICLE WITH AUTOMATIC MECHANICAL TRANSMISSION

In parallel hybrid electrical vehicle （PHEV） equipped with automatic mechanical transmission （AMT）, the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gearshift and clutch operation. To improve these performance indexes of PHEV, a coordinated control system is proposed through the analyzing of HEV powertrain dynamic characteristics. Using the method of minimum principle, the input torque of transmission is optimized to improve the driving smoothness of vehicle. Using the methods of fuzzy logic and fuzzy-PID, the engaging speed of clutch and the throttle opening of engine are manipulated to ensure the smoothness of clutch engagement and reduce the abrasion of clutch friction plates. The motor provides the difference between the required input torque of transmission and the torque transmitted through clutch plates. Results of simulation and experiments show that the proposed control strategy performs better than the contrastive control system, the smoothness of driving and the abrasion of clutch can be improved simultaneously.

New Transmission for Electric and Hybrid Vehicles

The present article is concerned with a method for automatic control of the transmission ratio and torque moment from the engine to the driven wheel and transmission construction in the way that the engine can operate during the entire time of the vehicle’s movement at the optimum condition. It is proposed to consider a new vehicle transmission device. Usually every innovation goes through three stages of consideration: 1) It is a rubbish. 2) There is something in it. 3) That is how it should be, what is complicated in it, it’s very simple. The proposal project is now in the first stage with the transition to the second stage. However, the transmission mechanism is simple, it works well and there is hope for its future prospects.

Hardware Design and Test of a Gear-Shifting Control System of a Multi-gear Transmission for Electric Vehicles

The performance of electric vehicles is affected by the shift quality of multi-gear transmission.The realization of dual-target tracking control requires the transmission control unit(TCU)to accurately measure and process the input signals of the gear-shifting control system and precisely control the drive motor torque and the position of shift motors.An electric-vehicle-dedicated TCU was designed to meet the above design requirements.Its function modules included a single-chip control circuit,shift position signal sampling circuit,signal conditioning circuit of the rotational speed and angle,controller area network communication circuit,and shift motor drive circuit.A hardware-in-the-loop simulation test system showed that the TCU design scheme met measurement accuracy requirements and coordinated the actions of the shift actuator and motor control unit to achieve fast and smooth shifting before the road test.The power interruption time of the shifting process was within 350 ms.The reliability of the TCU design was further verified in a 150,000-km vehicle road test.

Model-Based Double Closed-Loop Coordinated Control Strategy for the Electro-Mechanical Transmission System of Heavy Power-Split HEVs

The dual-mode electro-mechanical transmission(EMT)system is a crucial part of power-split hybrid electric vehicles(HEVs),especially for the heavy HEVs.To improve the precision of the system power distribution and the response speed of the electric power supply,a model-based double closed-loop coordinated control strategy is proposed.As the basis of the proposed control strategy,an EMT system model,particularly of an electrical system,is established first.The proposed control strategy includes the power distribution strategy,battery power closed-loop feedback control strategy,and motor coordinated control strategy.To verify the feasibility of the proposed control strategy,simulation and experiment are performed.The results indicate that the proposed control strategy can realize the expected power distribution by coordinating generators and motors and achieve rapid and stable electric power supply.

基于功率外环附加阻尼控制的柔性直流抑制送端火电机组次同步振荡研究

利用柔性直流控制的灵活性抑制次同步振荡被广泛研究,但是对于有功、无功控制回路的抑制效果不同的机理解释很少。针对柔直近区火电机组的次同步振荡问题,提出一种基于功率外环附加阻尼控制的柔直抑制次同步振荡策略。通过对电气阻尼曲线负阻尼频段分析,结合柔直变流器控制特点,选取附加控制的最优位置,通过基于功率外环附加阻尼控制提高火电机组电气阻尼。然后,建立复转矩系数传递函数,分析有功、无功外环附加阻尼控制效果的强弱与柔直功率外环参数相关,主要是与传输有功、无功功率大小有关,揭示柔直功率外环d轴和q轴附加阻尼控制时对电气阻尼影响差异的机理。最后,通过PSCAD时域模型仿真验证分析的正确性。

基于频率控制的封闭腔体微波无线输能技术

随着航空航天技术的快速发展,封闭腔体内的无线能量传输(Wireless Power Transmission,WPT)技术开始受到广泛关注.基于频率控制的WPT技术,可实现对电大封闭腔体(103×λ3)内的多方位传感器进行可控和高效的无线充电.电大腔体内的电场分布对频率的变化敏感,利用频率变化实现对封闭腔体场分布控制.实验结果表明,在S波段的1 m3腔体最高WPT传输效率为96.6%.设计的宽带整流电路实测整流效率最高为80%,整流效率高于50%的带宽为1.65 GHz.在2.401~2.495 GHz频段实现控制双接收机的不同工作状态,展现其在航空航天器等封闭空间中为传感器无线供电的应用前景.

基于模糊神经网络的造纸机械电力传动控制系统设计

造纸机械中电力传动机构的传动点数量多,控制难度较大,故提出基于模糊神经网络的造纸机械电力传动控制系统设计研究。硬件设计,包括电力传动控制结构设计单元、电力传动速度测量传感器设计单元与电力传动控制器设计单元,软件设计,包括模糊神经网络控制模型构建模块、电力传动速度控制实现模块与电力传动张力控制实现模块。通过硬件单元与软件模块的联合应用共同实现造纸机械电力传动的控制。实验数据显示:应用设计系统获得的电力传动点速度控制结果与期望速度相同,电力传动点张力控制结果与期望张力相同,充分证实了设计系统应用性能较佳。

1800m^(3)高炉上料卷扬电控系统改造实践研究

本文主要介绍了1800m^(3)高炉上料卷扬电控系统改造实践。重点对上料卷扬电控系统的传动控制部分进行了论述。本文也阐述了1800m^(3)高炉上料卷扬电控系统改造过程中遇到的困难、调试的重点难点问题等内容,通过改造前后的对比,阐述了改造的意义及效果,为后期其他高炉的改造奠定了基础。

电控机械式自动变速器控制系统的设计及实验

为了提高电动汽车的经济性以及动力性,设计了电控机械式自动变速器控制系统.通过设计变速器结构、匹配优化传动比,提出了最优换挡规律,并通过不同工况下的实验进行验证,建立了换挡系统控制模型,开展了电机与变速器的协同控制研究,达到了提高电动汽车性能的目的,并且为后续变速器的进一步优化奠定了基础.

电气传动自动控制中变频器应用技术探析

电气传动自动控制系统在现代工业自动化中扮演着关键角色,它们负责控制各种设备和机械的运行,以实现生产过程的高效性和自动化。深入研究电气传动自动控制中变频器的应用技术,包括其基本工作原理、在不同应用场景中的重要性以及对系统性能的影响。通过对变频器技术的全面分析,旨在为工程师和研究人员提供有关如何更好地利用这一技术来优化电气传动系统的实用指南。

冶金设备电气传动系统的智能控制探究

随着科技的不断发展,智能化控制已经成为各领域研究的热点。冶金设备电气传动系统中的智能控制,不仅可以提高设备的自动化程度,还能有效降低人工干预,减少误操作的可能性。通过智能控制,冶金设备可以实现更精确的产能控制,从而提高生产效率。以某地区钢渣处理线为例,分析在钢铁钢渣处理在线系统中PLC的具体应用。研究表明,以小型西门子PLC为核心,该系统运行状态良好,可满足客户不同需求。

机械传动系统电加载技术研究

文章主要研究电加载试验台设计方案、控制方式及试验验证技术,采用驱动电机与加载电机进行电功率封闭,通过整流、逆变单元以及可编程逻辑控制器(Programmable Logic Controller,PLC)实现转速和加载功率的无级控制与加载精度要求,并与润滑系统、机械系统实现关联互锁,保证系统运行稳定可靠。通过共直流母线控制方案技术研究,实现能源的回收再利用,降低试验成本。

基于LADRC的纯电动汽车双离合变速器换挡控制

针对纯电动汽车两挡双离合自动变速器(two-speed dual-clutch transmission,2DCT)换挡控制模型及参数的不确定性和存在的未知干扰,提出了一种线性自抗扰(linear active disturbance rejection controller,LADRC)换挡控制策略。首先建立2DCT换挡过程动力学模型,并分析了换挡过程;然后考虑控制模型的不确定性及未知干扰,将LADRC控制器应用到换挡过程对期望角速度进行跟踪,并采用扩张状态观测器(extended state observer,ESO)对扰动进行实时估计,并加以补偿,最后与PID控制进行对比。仿真和实验结果表明,该控制器跟踪误差更小,鲁棒性强,能保证良好的换挡品质。

某纯电动汽车蠕行工况轰鸣问题分析与控制策略优化

由于电驱传动系统刚性连接,使其呈现出“弱阻尼”状态,这会让纯电动汽车在某些特定工况下容易发生传动系统轰鸣问题。文章以某纯电动汽车蠕行工况轰鸣问题为例,系统地阐述电驱传动系统轰鸣问题的分析排查过程,分析转矩波动抑制失稳导致转矩波动过大是引起蠕行轰鸣的原因,提出电机转矩波动抑制失稳潜在机理及改进的主动阻尼控制策略。结合改进的主动阻尼控制逻辑,在不改变车辆传动系统结构的前提下,通过限制主动阻尼上限的方法,电机转矩波动抑制的失稳现象得到有效控制。并通过实车验证针对轰鸣问题的新主动阻尼控制方法的有效性,这对解决此类问题具有借鉴和参考价值。

水质监测无人船的电控系统设计

设计了一款轻便小巧的水质监测无人船,结合一体化水质监测电控系统进行水质温度、溶解氧质量浓度、氨氮质量浓度、pH的监测。硬件部分采用模块化结构设计,以Raspberry Pi 3B+作为主控模块,协同运行电源管理模块、数据采集模块、导航定位模块、避障模块、视觉采集模块、电机驱动模块、无线通信模块及岸基上位机。软件设计包括主程序、自主航行模式程序、遥控航行模式程序及无线通信模块程序的设计。将无人船放在城市湖面和河道进行实验,结果显示,5个固定监测点的监测参数在正常范围内,10个随机监测点的监测数据与专业仪器监测的数据相比,可决系数在0.94~0.99,验证了无人船运行的可行性以及监测数据的可靠性。