WO2012024935A1 - 多轴车辆电液伺服转向系统、转向控制方法和多轴车辆 - Google Patents

多轴车辆电液伺服转向系统、转向控制方法和多轴车辆 Download PDF

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Publication number
WO2012024935A1
WO2012024935A1 PCT/CN2011/072742 CN2011072742W WO2012024935A1 WO 2012024935 A1 WO2012024935 A1 WO 2012024935A1 CN 2011072742 W CN2011072742 W CN 2011072742W WO 2012024935 A1 WO2012024935 A1 WO 2012024935A1
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WO
WIPO (PCT)
Prior art keywords
steering
axle
controller
servo
electro
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/072742
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English (en)
French (fr)
Inventor
詹纯新
刘权
郭堃
黎鑫溢
李英智
郭纪梅
林小珍
张建军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Zoomlion Special Vehicle Co Ltd
Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
Original Assignee
Hunan Zoomlion Special Vehicle Co Ltd
Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
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Filing date
Publication date
Application filed by Hunan Zoomlion Special Vehicle Co Ltd, Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd filed Critical Hunan Zoomlion Special Vehicle Co Ltd
Publication of WO2012024935A1 publication Critical patent/WO2012024935A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
    • B62D7/14—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering
    • B62D7/142—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering specially adapted for particular vehicles, e.g. tractors, carts, earth-moving vehicles, trucks
    • B62D7/144—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering specially adapted for particular vehicles, e.g. tractors, carts, earth-moving vehicles, trucks for vehicles with more than two axles

Definitions

  • Multi-axis vehicle electro-hydraulic servo system steering control method and multi-axis vehicle.
  • This application was submitted to the State Intellectual Property Office of China on August 26, 2010, application number 201010265429.5, and the invention name is "multi-axis vehicle electro-hydraulic servo Priority of the invention patent application of the Luna steering system, the steering control method, and the multi-axis vehicle. BACKGROUND OF THE INVENTION 1.
  • the present invention relates to a steering system and a steering control method for a multi-axle vehicle, and to a multi-axle vehicle having the electro-hydraulic servo system.
  • Vehicle steering systems have a direct bearing on the safety, maneuverability, and steering stability of a vehicle's history.
  • the load on the whole vehicle is getting larger and larger, which requires an increase in the number of axles and a longer body.
  • the number of steering axles is increased, and on the other hand, the steering wheels are required to be coordinated with each other during steering.
  • the traditional multi-axle vehicle uses the hydraulic assisted rod drive transmission steering system, which occupies the frame layout space, and the rod system is easily deformed. When the vehicle is running at high speed, there may be a swing phenomenon and poor stability.
  • An object of the present invention is to provide a steering system for a multi-axle vehicle which is simple in structure, safe and reliable, and has good steering stability.
  • an object of the present invention is to provide a steering control method for a multi-axle vehicle. It is also an object of the present invention to provide a multi-axle vehicle having the steering system.
  • an aspect of the present invention provides an electro-hydraulic servo steering system for a multi-axis vehicle including a first axle and a rear steering axle, the electro-hydraulic servo steering system including: hydraulic steering a system comprising a variable pump providing an oil source, at least a steering assist oil rainbow mounted on the rear steering axles, a control oil disposed on a main oil passage between the variable pump and the steering assist oil rainbow a servo-proportional valve for road direction and flow regulation, an electronic control system for calculating a target rotation angle required for each of the rear steering bridges according to a corner signal and a steering mode of the first bridge, and to the rear steering axle
  • the servo proportional valve outputs a command signal corresponding to the target rotation angle, and simultaneously adjusts the command signal according to the corner signal fed back by the
  • the hydraulic steering system further includes a hydraulically controlled check valve disposed on the main oil passage, wherein the hydraulic control pipeline of the hydraulic control check valve is provided with a solenoid valve, and the electromagnetic valve is connected with the electronic control system signal. Further, the hydraulic steering system further includes a "fine oil filter" disposed on the main oil passage.
  • the electronic control system includes: a lower position control connected with a servo proportional valve signal of the rear steering bridges to form a closed loop control , a signal controller connected to each of the lower controllers, an upper controller for calculating a target rotation angle of the rear steering bridges according to the first bridge angle and the steering mode, and a plurality of angular displacement sensors for detecting the corner signals of the respective steering axles
  • the upper controller is further configured to perform vehicle state display and/or fault alarm according to the corner signal fed back by the angular displacement sensor.
  • the upper controller is a programmable logic controller. According to another aspect of the present invention.
  • a multi-axis vehicle having the above-described electro-hydraulic servo steering system is also provided.
  • the present invention also provides a steering control method for a multi-axle vehicle, comprising the steps of: detecting a first bridge of the vehicle and a rear steering axle a corner, and transmits the corner signal of the first bridge to the upper controller, wherein, in the rear steering bridge a servo proportional valve for controlling the steering assist cylinder and a lower controller for controlling the servo proportional valve; the upper controller calculates a target rotation angle required for the rear steering bridge according to the steering mode and the rotation angle signal of the first bridge, and correspondingly The target corner control signal is output to each lower controller; and each lower controller sends a command signal to the corresponding servo proportional valve according to the target rotation angle control signal of the upper controller, and adjusts the command signal in real time according to the corner signal fed back by the steering axle.
  • the upper controller is a programmable logic controller or a single chip microcomputer, and the response frequency of the lower controller is adapted to the response frequency of the servo control valve. Further, the above method further includes the step of using the corner signal fed back by the steering bridge for the vehicle status display and/or the fault alarm.
  • the steering system of the present invention has a simplified structural arrangement, and the servo proportional valve is used to realize the steering control, and the differential pressure compensation valve and the diverter valve are not added, and the components are implemented with as few components as possible.
  • the high performance makes the system relatively safe and reliable.
  • the servo proportional valve has a huge advantage of fast response and easy to achieve precise control.
  • variable pump can meet the flow requirements of the engine at idle and relatively energy-saving.
  • the present invention preferably uses an electronic control system of a two-stage controller, and the servo valve and the lower controller form a small closed loop, and the low-frequency response lower controller cooperates with the servo proportional valve to ensure Accuracy, a host controller such as a programmable logic controller (or PLC or PLC controller) performs the main calculation work, and sends a command signal corresponding to the target corner to each lower controller (or called a single-axis closed loop). Controller).
  • a host controller such as a programmable logic controller (or PLC or PLC controller) performs the main calculation work, and sends a command signal corresponding to the target corner to each lower controller (or called a single-axis closed loop). Controller).
  • FIG 1 is a schematic view showing a hydraulic steering system of an electro-hydraulic servo steering system of a multi-axle vehicle according to the present invention
  • FIG. 2 is a schematic view showing the power steering cylinder of the hydraulic steering system shown in FIG. 1 mounted on a steering axle.
  • FIG. 3 is a schematic view showing an electronic control system of an electro-hydraulic servo-turn steering system of a multi-axis vehicle according to the present invention
  • FIG. 4 is a view showing a steering for a multi-axis vehicle electro-hydraulic servo steering system according to the present invention.
  • the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
  • the electro-hydraulic servo steering system of the multi-axis vehicle of the present invention includes a hydraulic steering system and an electronic control system, which are shown in Figs. 1 and 2, and an electronic control system is shown in Fig. 3.
  • the steering control mode of the first bridge is not limited, and a conventional steering control method, such as a hydraulic assist plus a mechanical guide, may be employed, or the steering assist oil red of the present invention may be used to directly drive the steering trapezoidal trapezoid.
  • the present invention is intended to enable rapid, accurate, and reliable tracking of the first bridge corners at subsequent corners of the steering axle.
  • the electro-hydraulic servo steering system of the multi-axle vehicle of the present invention will be described in detail below with reference to FIGS. 1 to 3. As shown in FIGS.
  • the hydraulic steering system includes: two steering assist oil red 6 installed between the axle 30 and the knuckle arms 21, 22 of the steering axle trapezoidal arm 20, and provided to the two steering assist oil red 6
  • the hydraulic steering system may further include a hydraulic control check valve 10 and a precision oil filter 8 disposed on the main oil passages of the two steering assist oil rainbows 6, wherein the control oil passage of the hydraulic control check valve is provided with a solenoid valve 9.
  • the two oil-red shaft chambers of the two power steering oil red 6 are connected to the other oil red rodless chamber.
  • the servo valve proportional valve 5 has a flow regulating function and a reversing function, which can be obtained by a commercially available one. Through the reversing function of the servo valve 5, the oil path can be controlled to realize the extension and return of the steering assisting oil rainbow.
  • the oil quantity adjustment function can change the oil supply amount to the steering assist oil rainbow. By adjusting the oil supply amount to the steering assist oil rainbow, the movement of the steering assist oil rainbow can be controlled, thereby achieving precise control of the steering angle of the steering axle.
  • the electronic control system is configured to calculate a target rotation angle required for each of the rear steering bridges according to the corner signal and the steering mode of the first bridge, and the servo proportional valve output to the rear steering axles corresponds to the target rotation angle.
  • the command signal is simultaneously adjusted in real time according to the corner signal fed back by each of the steering axles.
  • the steering mode is a mode selected or set by the user such as normal steering, rear axle locking, and crab steering.
  • the electronic control system of the present invention preferably employs a two-stage controller, as shown in FIG.
  • a lower-level controller (or a single controller) connected to the servo proportional valve signal of the rear steering bridges and forming a single-axis closed-loop control Axis closed-loop controller) 3, a signal connection with each lower controller 3, a higher-level controller 2 for calculating a target rotation angle of the subsequent steering bridges according to a corner signal of the first bridge and a steering mode, such as a programmable logic controller (or The PLC controller) and the angular displacement sensor mounted on each of the steering axles include a first angular displacement sensor 1 mounted on the first bridge and a second angular displacement sensor 1 mounted on the rear steering axles, wherein Each angular displacement sensor is separately coupled to the upper controller and the corresponding lower controller for detecting the actual corner signal of each steering axle.
  • the lower controller 3 is also signally coupled to the solenoid valve 9 for controlling the pilot operated check valve 10.
  • the solenoid valve 9 When the solenoid valve 9 is energized, the control oil source of the hydraulic control check valve 10 is cut off, and the steering assist force rainbow 6 is locked; when the solenoid valve 9 is de-energized, the hydraulic control check valve 10 is opened, and the servo valve proportional valve 5 can be controlled. Turn to assist red 6 action.
  • the advantages of the electronic control system using the two-stage controller are:
  • the servo proportional valve 5 and the lower controller 3 form a small closed loop, and the low-frequency response lower controller 3 cooperates with the high-frequency response servo-valve proportional valve 5, which ensures Dynamic accuracy and steady-state accuracy, the upper controller performs the main calculation work and sends it to each lower controller 3 target rotation angle command signal.
  • the steering control method of the multi-axle vehicle of the present invention comprises the steps of: detecting a corner of the first bridge of the vehicle and the rear steering axles, and transmitting a corner signal of the first bridge to the upper controller, wherein the rear steering axles are a servo proportional valve for controlling the steering assist cylinder and a lower controller for controlling the servo proportional valve; the upper controller calculates a target rotation angle required for the rear steering bridge according to the steering mode and the rotation angle signal of the first bridge, and correspondingly The target corner control signal is output to each lower controller; and each lower controller sends a command signal to the corresponding servo proportional valve according to the target corner control signal of the upper controller, and adjusts the command signal in real time according to the corner signal fed back by the steering bridge.
  • FIGS. 1 to 4 when the vehicle is turning, the steering wheel is rotated, and the angle signal is detected by the angular displacement sensor 1 mounted on the first bridge, and this signal is transmitted to the upper controller 2.
  • the upper controller 2 calculates a target rotation angle required for each axis according to the steering mode selected by the user and the first bridge rotation angle signal, and outputs the same to the lower position controller 3 through the analog output port.
  • the lower controller 3 After receiving the rotation angle control signal of the upper controller 2, the lower controller 3 controls the servo proportional valve 5, and the hydraulic pump is supplied by the variable pump 4, thereby driving the steering assist oil rainbow 6 to drive the steering bridge 7 (ie, a rear steering axle).
  • the lower controller 3 compares the rotation angle feedback signal with the command signal of the upper controller 2, and adjusts the control signal of the servo proportional valve 5 in real time according to the comparison result. Until the feedback signal is equal to the command signal.
  • the closed-loop control of the single-axis corner the rear corners of the following steering axles 7 can be used to track the first bridge corners quickly, accurately and reliably.
  • the corner relationship can be flexibly set in the upper controller 2, it is convenient to implement various steering modes, including normal steering, rear axle locking, and crab steering.
  • the corner signals of the rear steering axles 7 are transmitted to the lower controller 3 for comparison, and are also transmitted to the upper controller 2, and the upper controller 2 performs vehicle state display and/or fault according to the corner signals fed back by the angular displacement sensors 1.
  • Alarms shown in Figure 3; for real-time monitoring and fault determination.
  • the steering system and the steering control method of the present invention are free from the disadvantages of the steering rod deformation, assembly error, and accumulated error in the original linkage-steering system.
  • the closed-loop control and the micro-control of the servo proportional valve ensure the steady-state accuracy, while the response speed of the servo proportional valve also ensures the dynamic accuracy.
  • the engine speed changes within a range of 4 inches.
  • the variable pump is used to ensure that the system has sufficient oil supply and is relatively energy-saving.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Description

多轴车辆电液伺月 转向系统、 转向控制方法和多轴车辆 本申请要求于 2010年 8月 26 日提交至中国国家知识产权局、 申请号为 201010265429.5、 发明名称为"多轴车辆电液伺月艮转向系统、 转向控制方法和 多轴车辆"的发明专利申请的优先权。 技术领域 本发明涉及一种多轴车辆的转向系统和转向控制方法， 本发明还涉及一 种具有该电液伺月艮转向系统的多轴车辆。 背景技术 车辆转向系统对于车辆行 3史的安全性、 机动性和操纵稳定性都有直接的 关系。 随着重型汽车的发展， 整车负载越来越大， 这就需增加车桥数量， 车身 也越来越长。 为了减小最小转向半径和行驶阻力， 同时减少轮胎磨损， 一方 面要增加转向桥数量， 另一方面要求各转向车轮， 在转向时相互协调。 传统多轴车辆釆用的是液压助力杆系传动转向系统， 占用了车架布置空 间， 而且杆系易变形， 车辆高速行驶时有可能存在摆动现象且稳定性差。 近 年来， 随着电液技术的迅速发展， 在多轴车辆上釆用电液控制转向系统已有 应用，但一般的电液比例电磁阀由于响应频率的限制，使得转向时误差较大， 尤其是动态误差较大， 这极大地影响了转向性能和轮胎寿命。 有鉴于此， 亟待开发出一种新的转向系统， 对多轴转向系统中的各性能 参数提出更高的要求， 以确保车辆行驶的安全性、 机动性和操纵稳定性。 发明内容 本发明目的在于提供一种多轴车辆的转向系统， 该转向系统结构布置简 单、 安全可靠、 操纵稳定性好， 本发明的另一目的在于提供一种多轴车辆的 转向控制方法。本发明的目的还在于提供一种具有所述转向系统的多轴车辆。 为此， 本发明一方面提供了一种用于多轴车辆的电液伺服转向系统， 该 多轴车辆包括第一桥和在后各转向桥， 该电液伺服转向系统包括： 液压转向 系统， 其包括提供油源的变量泵、 至少安装于所述在后各转向桥上的转向助 力油虹、 在所述变量泵和转向助力油虹之间的主油路上设置的用于控制油路 走向和流量调节的伺服比例阀， 电子控制系统， 用于根据第一桥的转角信号 和转向模式计算出在后各转向桥所需的目标转角， 并且向所述在后各转向桥 的所述伺服比例阀输出与所述目标转角相对应的指令信号， 同时根据所述在 后各转向桥反馈的转角信号实时调节所述指令信号。 进一步地， 上述液压转向系统还包括在主油路上设置的液控单向阀， 其 中， 液控单向阀的液控管路上设置有电磁阀， 电磁阀与电子控制系统信号连 接。 进一步地， 上述液压转向系统还包括在主油路上设置的^ "密滤油器。 进一步地， 上述电子控制系统包括： 与在后各转向桥的伺服比例阀信号 连接并形成闭环控制的下位控制器， 与各下位控制器信号连接、 用于根据第 一桥转角和转向模式计算在后各转向桥的目标转角的上位控制器， 以及用于 检测各转向桥的转角信号的多个角位移传感器。 进一步地， 上述上位控制器还用于根据角位移传感器反馈的转角信号进 行车辆状态显示和 /或故障报警。 进一步地， 上述上位控制器为可编程逻辑控制器。 根据本发明的另一方面， 还提供了一种具有上述电液伺服转向系统的多 轴车辆。 本发明还提供了一种多轴车辆的转向控制方法， 其包括以下步骤： 检测 车辆第一桥和在后各转向桥的转角， 并将第一桥的转角信号传送给上位控制 器， 其中， 在后各转向桥设有用于控制转向助力油缸的伺服比例阀和用于控 制伺服比例阀的下位控制器； 上位控制器根据转向模式和第一桥的转角信号 计算在后各转向桥所需的目标转角， 并且将相应的目标转角控制信号输出至 各下位控制器； 以及各下位控制器根据上位控制器的目标转角控制信号向相 应的伺服比例阀发送指令信号， 并且根据转向桥反馈的转角信号实时调节指 令信号。 进一步地， 上述上位控制器为可编程逻辑控制器或单片机， 下位控制器 的响应频率与伺服控制阀的响应频率相适配。 进一步地， 上述方法还包括将转向桥反馈的转角信号用于车辆状态显示 和 /或故障报警的步骤。 与一般的杆系连接和电液转向方案相比， 本发明的转向系统结构布置简 化， 用伺服比例阀来实现转向控制， 未加入压差补偿阀和分流阀等， 用尽量 少的元器件实现了高性能， 使得系统相对安全可靠； 釆用伺服比例阀， 具有 响应速度快的巨大优势， 易于实现精确控制； 另外， 釆用变量泵既满足发动 机怠速时的流量要求又相对节能。 与一般的电子控制系统相比， 本发明优选釆用两级控制器的电子控制系 统， 伺月艮比例阀和下位控制器形成一个小闭环， 高频响应的下位控制器配合 伺服比例阀保证了精度， 上位控制器例如可编程逻辑控制器（或称为 PLC或 PLC控制器）进行主要的计算工作， 并将与目标转角相对应的指令信号发送 给各下位控制器 （或称为单轴闭环控制器）。 根据本发明多轴车辆的电液伺服转向系统， 多种转向模式可灵活运用， 可操作性强， 转向模式方便扩展。 除了上面所描述的目的、 特征、 和优点之外， 本发明具有的其它目的、 特征、 和优点， 将结合附图作进一步详细的说明。 附图说明 构成本说明书的一部分、 用于进一步理解本发明的附图示出了本发明的 优选实施例， 并与说明书一起用来说明本发明的原理。 图 1示出了根据本发明多轴车辆的电液伺服转向系统的液压转向系统的 示意图； 图 2示出了图 1所示的液压转向系统的助力转向油缸安装于转向桥的示 意图。 图 3示出了才艮据本发明多轴车辆的电液伺月艮转向系统的电子控制系统的 示意图； 以及 图 4示出了根据本发明多轴车辆电液伺服转向系统的用于实现转向桥转 向的控制逻辑框图。 具体实施方式 以下结合附图对本发明的实施例进行详细说明， 但是本发明可以由权利 要求限定和覆盖的多种不同方式实施。 本发明的多轴车辆的电液伺服转向系统包括液压转向系统和电子控制系 统， 该液压转向系统在图 1和图 2中示出， 电子控制系统在图 3中示出。 在 本发明中， 第一桥的转向控制方式不受限制， 可釆用传统的转向控制方式， 例如液压助力加机械导向的方式， 也可以釆用本发明的转向助力油紅直接驱 动转向桥梯形臂的方式。 本发明意欲使在后各转向桥转角快速、 准确、 可靠 的 艮踪第一桥转角。 下面结合图 1至图 3对本发明多轴车辆的电液伺月艮转向 系统进行详细说明。 如图 1和图 2所示， 液压转向系统包括： 安装在车桥 30和转向桥梯形 臂 20的转向节臂 21、 22之间的两转向助力油紅 6、 向两转向助力油紅 6提 供油源的变量泵 4 , 以及控制转向助力油虹 6动作进而实现转向的伺服比例 阀 5。 此外， 液压转向系统还可以包括在两转向助力油虹 6主油路上设置的液 控单向阀 10和精密滤油器 8 , 其中， 液控单向阀的控制油路上设置有电磁阀 9。 两转向助力油紅 6的一油紅的有杆腔和另一油紅无杆腔相连通， 当一油 虹伸出时， 另一油虹回缩， 以实现协同动作， 釆用两个转向助力油虹， 增大 了车桥转向助力和有效降低了车辆转向液压压力需求， 为节能和节约布置空 间提供条件。 伺月艮比例阀 5具有流量调节功能和换向功能， 可通过市购获得， 通过该 伺月艮比例阀 5的换向功能， 可控制油路走向进而实现转向助力油虹的伸出和 回缩， 油量调节功能可以改变向转向助力油虹的供油量， 通过调节向转向助 力油虹的供油量， 可以控制转向助力油虹的动作， 进而实现对转向桥转向角 度的精确控制。 在本发明中， 电子控制系统用于根据第一桥的转角信号和转向模式计算 出在后各转向桥所需的目标转角， 并且向在后各转向桥的伺服比例阀输出与 目标转角相对应的指令信号， 同时根据在后各转向桥反馈的转角信号实时调 节该指令信号。 在这里， 转向模式是诸如正常转向、 后桥锁死、 蟹行转向等由用户选择 或设定的模式。 本发明的电子控制系统优选釆用两级控制器， 如图 3所示， 其包括： 与 在后各转向桥的伺服比例阀信号连接并形成单轴闭环控制的下位控制器 （或 称为单轴闭环控制器） 3 , 与各下位控制器 3 信号连接、 用于根据第一桥的 转角信号和转向模式计算在后各转向桥的目标转角的上位控制器 2例如可编 程逻辑控制器（或称 PLC控制器）， 以及在各转向桥上安装的角位移传感器， 包括第一桥上安装的第一角位移传感器 1和在后各转向桥上安装的第二角位 移传感器 1，， 其中， 各角位移传感器分别与上位控制器和相应的下位控制器 信号连接， 用于检测各转向桥的实际转角信号。 下位控制器 3还与电磁阀 9信号连接， 用于控制液控单向阀 10。 当电磁 阀 9得电时， 切断液控单向阀 10的控制油源， 锁定转向助力虹 6; 当电磁阀 9失电时， 液控单向阀 10打开， 伺月艮比例阀 5可以控制转向助力紅 6动作。 釆用两级控制器的电子控制系统的优点是： 伺服比例阀 5和下位控制器 3形成一个小闭环， 高频率响应的下位控制器 3配合高频率响应的伺月艮比例 阀 5， 保证了动态精度和稳态精度， 上位控制器进行主要的计算工作， 并发 送给各下位控制器 3 目标转角指令信号。 本发明的多轴车辆的转向控制方法包括以下步骤： 检测车辆第一桥和在 后各转向桥的转角， 并将第一桥的转角信号传送给上位控制器， 其中， 在后 各转向桥设有用于控制转向助力油缸的伺服比例阀和用于控制伺服比例阀的 下位控制器； 上位控制器根据转向模式和第一桥的转角信号计算在后各转向 桥所需的目标转角， 并且将相应的目标转角控制信号输出至各下位控制器； 以及各下位控制器根据上位控制器的目标转角控制信号向相应的伺服比例阀 发送指令信号， 并且根据转向桥反馈的转角信号实时调节指令信号。 下面再结合图 1至图 4对本发明电液伺月艮转向系统和转向控制方法进行 说明。 参见图 4, 车辆进行转向时， 转动方向盘， 通过装在第一桥的角位移传 感器 1来检测此角度信号， 并将此信号传送给上位控制器 2。 上位控制器 2根据用户选择的转向模式和第一桥转角信号计算每轴所需 的目标转角， 再通过模拟量输出端口输出给下位控制器 3。 下位控制器 3接收到上位控制器 2 的转角控制信号后，控制伺服比例阀 5 , 由变量泵 4提供液压动力， 进而驱动转向助力油虹 6带动转向桥 7 (即某 在后转向桥） 实现转向， 同时通过第二角位移传感器 1，检测转向桥 7的实际 转角， 下位控制器 3将转角反馈信号与上位控制器 2 的指令信号进行比较， 根据比较结果实时调节伺服比例阀 5的控制信号， 直到反馈信号与指令信号 相等为止。 通过单轴转角的闭环控制， 可使后面各转向桥 7转角快速、 准确、 可靠 的跟踪第一桥转角。 由于在上位控制器 2中转角关系可以灵活设定， 故方便实现多种转向模 式， 包括正常转向， 后桥锁死， 蟹行转向等模式。 后面各转向桥 7的转角信 号既传给下位控制器 3做比较用， 同时也传递给上位控制器 2 , 上位控制器 2根据这些角位移传感器 1反馈的转角信号进行车辆状态显示和 /或故障报警 (如图 3所示；)， 以实现实时监控和故障判断用。 本发明的转向系统和转向控制方法摆脱了原来的杆系连接转向系统中转 向拉杆变形、 装配误差、 累积误差的不利因素。 闭环控制及伺服比例阀的微 控性保证了稳态精度， 而伺服比例阀的响应速度也保证了动态精度。 车辆行 驶时发动机转速在 4艮大的范围内变化， 釆用变量泵， 保证了怠速时系统的供 油量充足， 又相对节能。 以上仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域 的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则 之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围 之内。

Claims

权 利 要 求 书
1. 一种用于多轴车辆的电液伺月艮转向系统， 所述多轴车辆包括第一桥和在 后各转向桥， 其特征在于， 所述电液伺 艮转向系统包括： 液压转向系统， 其包括提供油源的变量泵、 至少安装于所述在后各 转向桥上的转向助力油缸、 以及在所述变量泵和转向助力油虹之间的主 油路上设置的用于控制油路走向和流量调节的伺服比例阀， 以及
电子控制系统， 用于根据第一桥的转角信号和转向模式计算出在后 各转向桥所需的目标转角， 并且向所述在后各转向桥的所述伺服比例阀 输出与所述目标转角相对应的指令信号， 同时根据所述在后各转向桥反 馈的转角信号实时调节所述指令信号。
2. 根据权利要求 1所述的电液伺服转向系统， 其特征在于， 所述液压转向 系统还包括在所述主油路上设置的液控单向阀， 其中， 所述液控单向阀 的液控管路上设置有电磁阀，所述电磁阀与所述电子控制系统信号连接。
3. 根据权利要求 1所述的电液伺服转向系统， 其特征在于， 所述液压转向 系统还包括在所述主油路上设置的精密滤油器。
4. 根据权利要求 1至 3中任一项所述的电液伺服转向系统， 其特征在于， 所述电子控制系统包括： 上位控制器， 下位控制器， 以及用于检测各所 述转向桥的转角信号的多个角位移传感器， 其中， 所述每个在后转向桥 的伺服比例阀和一个下位控制器信号连接并形成闭环控制， 所述上位控 制器与各所述下位控制器信号连接、 用于根据所述第一桥转角和转向模 式计算所述在后各转向桥的目标转角。
5. 居权利要求 4所述的电液伺 艮转向系统， 其特征在于， 所述上位控制 器还用于根据所述角位移传感器反馈的转角信号进行车辆状态显示和 / 或故障报警。
6. 居权利要求 4所述的电液伺 艮转向系统， 其特征在于， 所述上位控制 器为可编程逻辑控制器。
7. —种具有根据权利要求 1至 6中任一项所述的电液伺服转向系统的多轴 车辆。
8. —种多轴车辆的转向控制方法， 其特征在于， 包括以下步 4聚:
检测车辆第一桥和在后各转向桥的转角， 并将第一桥的转角信号传 送给上位控制器， 其中， 所述在后各转向桥设有用于控制转向助力油缸 的伺服比例阀和用于控制所述伺服比例阀的下位控制器；
所述上位控制器根据转向模式和所述第一桥的转角信号计算所述在 后各转向桥所需的目标转角， 并且将相应的目标转角控制信号输出至各 所述下位控制器； 以及
各所述下位控制器根据所述上位控制器的目标转角控制信号向相应 的伺服比例阀发送指令信号， 并且根据所述转向桥反馈的转角信号实时 调节所述指令信号。
9. 根据权利要求 8所述的多轴车辆的转向控制方法， 其特征在于， 所述上 位控制器为可编程逻辑控制器或单片机， 所述下位控制器的响应频率与 所述伺月艮控制阀的响应频率相适配。
10. 根据权利要求 8所述的多轴车辆的转向控制方法， 其特征在于， 还包括 将所述转向桥反馈的转角信号用于车辆状态显示和 /或故障报警的步骤。
PCT/CN2011/072742 2010-08-26 2011-04-13 多轴车辆电液伺服转向系统、转向控制方法和多轴车辆 Ceased WO2012024935A1 (zh)

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WO2014056169A1 (zh) * 2012-10-11 2014-04-17 中联重科股份有限公司 液压助力转向系统和工程车辆的底盘
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