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公开(公告)号：US5289388A
公开(公告)日：1994-02-22
申请号：US341580
申请日：1989-04-21
申请人： Mohamed E. Dahroug , Yehia M. El-Ibiary , Rajamouli Gunda , Paul M. Smith , Randall G. Silverthorn
发明人： Mohamed E. Dahroug , Yehia M. El-Ibiary , Rajamouli Gunda , Paul M. Smith , Randall G. Silverthorn
IPC分类号： F15B11/00 , B22D17/32 , B29C45/77 , F15B11/04 , F15B21/02 , G05B11/36 , G05B19/05 , G05B19/416 , G06F15/20
CPC分类号： G05B19/416 , B22D17/32 , G05B2219/34215 , G05B2219/35312 , G05B2219/36171 , G05B2219/36513 , G05B2219/37133 , G05B2219/37313 , G05B2219/37333 , G05B2219/37399 , G05B2219/41301 , G05B2219/42123 , G05B2219/45244
摘要： In a die casting machine that includes a shot cylinder having a ram for injecting metal into a die cavity, an electrohydraulic system for controlling operation of the shot cylinder includes an actuator coupled to the shot cylinder ram. A valve supplies hydraulic fluid to the actuator cylinder as a function of valve control signals. Microprocessor-based digital control electronics includes memory for storing a desired ram velocity profile as an incremental function of ram position. The control circuitry is responsive to signals from a sensor coupled to the actuator, indicative of position at the ram, for retrieving corresponding velocity signals from memory and supplying control signals to the valve as a function of such profile velocity signals. The control circuitry further includes facility for adjusting impact of the shot cylinder ram at the end of a cavity-filling stroke as a function of ram and actuator position and/or pressure, independently of the velocity/position profile, to reduce separation and flashing at the die cavity, and to reduce impact wear and fatigue on the overall die casting machine. A keyboard and associated operator display provide operator programmability and selection from a plurality of velocity/position profiles. The actuator and cylinder ram may be advanced in a manual mode of operation for adjustment and calibration proposes. A display associated with the keyboard graphically illustrates desired and actual velocity/position profiles during operation, together with a profile of actuator drive pressure verses position.
摘要翻译： 在包括具有用于将金属注入模腔的冲头的喷射缸的压铸机中，用于控制喷射气缸的操作的电动液压系统包括联接到喷射缸柱塞的致动器。 阀门作为阀门控制信号的一个功能，向致动器气缸提供液压油。 基于微处理器的数字控制电子设备包括用于存储期望的冲击速度轮廓作为推杆位置的增量功能的存储器。 控制电路响应来自耦合到致动器的传感器的信号，指示压头处的位置，用于从存储器检索对应的速度信号，并根据这种轮廓速度信号向阀提供控制信号。 控制电路还包括用于在空腔填充冲程结束时调节冲压缸压头的影响作为压头和致动器位置和/或压力的函数的功能，与速度/位置分布无关，以减少分离和闪烁 模腔，并减少整体压铸机的冲击磨损和疲劳。 键盘和相关联的操作者显示器提供操作员可编程性和从多个速度/位置轮廓中的选择。 致动器和气缸柱塞可以在手动操作模式下进行，以进行调整和校准。 与键盘相关联的显示器图形地示出了操作期间的期望和实际的速度/位置曲线，以及致动器驱动压力与位置的轮廓。
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公开(公告)号：US4811561A
公开(公告)日：1989-03-14
申请号：US164958
申请日：1988-03-07
申请人： Thomas L. Edwards , Yehia M. El-Ibiary , Rajamouli Gunda , Richard S. Leemhuis , Fred H. Phillips , Melvin A. Rode
发明人： Thomas L. Edwards , Yehia M. El-Ibiary , Rajamouli Gunda , Richard S. Leemhuis , Fred H. Phillips , Melvin A. Rode
IPC分类号： G05B19/414 , F16D31/00
CPC分类号： G05B19/414 , G05B2219/33337 , G05B2219/41309
摘要： An electrohydraulic system includes a plurality of electrohydraulic devices individually controlled by microprocessor-based control electronics. The device controllers are connected in common by a bidirectional serial data bus to a master controller for coordinating operation of the various devices. Internal programming within the master controller establishes a repetitive time-sequence of windows for communications with the various device controllers for downloading control signals and parameters, and for uploading data indicative of system status and operation. The various device controllers include internal programming for operating the associated hydraulic devices as a function of control signals and parameters received from the master controller. Pseudo-devices are also connected to the bus for time-division multiplexed communication with the master controller and for performing overall system coordination and analysis.
摘要翻译： 电动液压系统包括由基于微处理器的控制电子装置单独控制的多个电动液压装置。 设备控制器通过双向串行数据总线共同连接到主控制器，用于协调各种设备的操作。 主控制器内的内部编程建立了窗口的重复时间序列，用于与各种设备控制器进行通信，用于下载控制信号和参数，以及上传指示系统状态和操作的数据。 各种设备控制器包括用于根据从主控制器接收的控制信号和参数来操作相关联的液压装置的内部编程。 伪设备也连接到总线，用于与主控制器进行时分复用通信，并用于执行整个系统协调和分析。
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公开(公告)号：US4744218A
公开(公告)日：1988-05-17
申请号：US849542
申请日：1986-04-08
申请人： Thomas L. Edwards , Yehia M. El-Ibiary , Rajamouli Gunda , Richard S. Leemhuis , Fred H. Phillips , Melvin A. Rode
发明人： Thomas L. Edwards , Yehia M. El-Ibiary , Rajamouli Gunda , Richard S. Leemhuis , Fred H. Phillips , Melvin A. Rode
CPC分类号： G05B19/414 , G05B2219/33337 , G05B2219/41309
摘要： An electrohydraulic system includes a plurality of electrohydraulic devices individually controlled by microprocessor-based control electronics. The device controllers are connected in common by a bidirectional serial data bus to a master controller for coordinating operation of the various devices. Internal programming within the master controller establishes a repetitive time-sequence of windows for communications with the various device controllers for downloading control signals and parameters, and for uploading data indicative of system status and operation. The various device controllers include internal programming for operating the associated hydraulic devices as a function of control signals and parameters received from the master controller.
摘要翻译： 电动液压系统包括由基于微处理器的控制电子装置单独控制的多个电动液压装置。 设备控制器通过双向串行数据总线共同连接到主控制器，用于协调各种设备的操作。 主控制器内的内部编程建立了窗口的重复时间序列，用于与各种设备控制器进行通信，用于下载控制信号和参数，以及上传指示系统状态和操作的数据。 各种设备控制器包括用于根据从主控制器接收的控制信号和参数来操作相关联的液压装置的内部编程。
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公开(公告)号：US5135031A
公开(公告)日：1992-08-04
申请号：US769112
申请日：1991-09-30
申请人： Roy T. Burgess , Rajamouli Gunda , Frank Herta , Robert C. Hodges , James A. Kessler , Richard S. Leemhuis , Michael R. McCarty , Robert W. Stephens
发明人： Roy T. Burgess , Rajamouli Gunda , Frank Herta , Robert C. Hodges , James A. Kessler , Richard S. Leemhuis , Michael R. McCarty , Robert W. Stephens
CPC分类号： G05D16/2066 , F04B49/065 , F04B2201/1201 , F04B2201/12051 , F04B2205/05 , F04B2207/01 , F04B2207/0422 , Y10T137/86622
摘要： A rotary hydraulic machine which includes a housing having a shaft mounted for rotation within the housing about a shaft axis. A cylinder block is coupled to the shaft for co-rotation with the shaft within the housing and includes a plurality of cylinders disposed in a circumferential array parallel to and surrounding the shaft axis. A piston is disposed to reciprocate within each of the cylinders and is coupled to a yoke for determining displacement of the pistons within the cylinders. A valve plate is mounted on a valve block and includes kidney-shaped slots for registering with the cylinders as the cylinder block rotates, and thereby connecting the cylinders to pump input and output ports. A microprocessor-based controller is externally mounted on the pump valve block and includes internal memory having various remotely-selectable control programs prestored therein. Sensors responsive to pump operating conditions are connected to the pump control electronics, and include a first sensor responsive to yoke position, a pressure sensor responsive to pump output pressure and a speed sensor responsive to angular velocity of shaft rotation. All of the electronic components are mounted on the valve block.
摘要翻译： 一种旋转液压机，其包括具有轴的壳体，所述轴安装成用于在所述壳体内围绕轴线旋转。 气缸体联接到轴上，用于与壳体内的轴共同旋转，并且包括多个圆筒，该圆柱体设置成平行于并围绕轴线的周向阵列。 活塞被设置成在每个气缸内往复运动，并且联接到轭，以确定活塞在气缸内的位移。 阀板安装在阀块上，并且在气缸体旋转时包括用于与气缸配准的肾形槽，从而将气缸连接到泵输入和输出端口。 基于微处理器的控制器外部安装在泵阀块上，并且包括其中预先存储有各种可远程选择的控制程序的内部存储器。 响应于泵操作条件的传感器连接到泵控制电子器件，并且包括响应于轭位置的第一传感器，响应于泵输出压力的压力传感器和响应于轴旋转的角速度的速度传感器。 所有电子部件安装在阀块上。
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公开(公告)号：US5023535A
公开(公告)日：1991-06-11
申请号：US341212
申请日：1989-04-21
CPC分类号： G05B11/28 , G05B19/19 , G05B19/4142 , G05B2219/34045 , G05B2219/34356 , G05B2219/41301 , G05B2219/42237
摘要： An electrohydraulic servo system in which a microprocessor-based controller directs a pulse width modulated control signal to a servo valve for controlling flow of hydraulic fluid therethrough. Duration of each half-cycle in the pulse width modulated control signal is separately controlled by selectively incrementing or decrementing duration of the half-cycle in increments of the microprocessor clock period. Signal transition is controlled by a timer interrupt in which time required to enter the interrupt routine is measured following generation of the interrupt, and further operation is delayed by a complementary time, so that control signal transition takes place a fixed preselected number of clock periods after generation of a timer interrupt. In this way, timer interrupt latency is eliminated, and resolution of the pulse width modulated signal is enhanced through individual duration control of the signal half-cycles while maintaining a fixed modulated signal period.
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公开(公告)号：US4798527A
公开(公告)日：1989-01-17
申请号：US164957
申请日：1988-03-07
申请人： Rajamouli Gunda
发明人： Rajamouli Gunda
IPC分类号： F15B13/043 , B29C45/77 , B29C45/82 , F15B11/028 , F15B11/04
CPC分类号： B29C45/77 , B29C45/82 , Y10T137/7759 , Y10T137/7761
摘要： An electrohydraulic servo system for controlling pressure of fluid in a cavity of undetermined volume includes a valve having a valve spool element and ports for supplying fluid as a function of position of the valve element within the surrounding valve body. A servo valve is responsive to electronic valve control signals for controlling pilot pressure within the main valve body and thereby controlling position of the valve element. An electronic valve controller receives a pressure command signal from remote master electronics as a function of desired fluid pressure within the cavity volume, and a pressure feedback signal indicative of fluid pressure within the cavity volume from a pressure sensor coupled to the valve output ports. The pressure command signal is compared to the pressure feedback signal in a pressure-control mode of operation, and a difference or error signal is employed for generating valve control signals to the servo valve. A second sensor is coupled to the valve element for supplying a position feedback signal as a function of position of the valve element within the surrounding valve body.
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公开(公告)号：US4612489A
公开(公告)日：1986-09-16
申请号：US684265
申请日：1984-12-20
申请人： Rajamouli Gunda
发明人： Rajamouli Gunda
CPC分类号： G05D3/14 , G05D3/1445
摘要： An electrohydraulic servo control system responsive to a load acceleration or velocity command input signal wherein the input command signal is integrated and compared with position feedback from the valve actuator and load to obtain an error signal which controls the actuator. The velocity command input may be multiplied by an exponential factor to compensate for system following error. Another modification contemplates resetting of command signals to compensate for following error and to eliminate dead time upon change of direction of the load by the operator.
摘要翻译： 一种电液伺服控制系统，其响应于负载加速度或速度指令输入信号，其中输入指令信号被积分并与来自阀致动器和负载的位置反馈进行比较，以获得控制致动器的误差信号。 速度命令输入可以乘以指数因子来补偿系统跟随误差。 另一种修改考虑了复位命令信号以补偿跟随误差，并且在操作者改变负载方向时消除死区时间。
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公开(公告)号：US4625622A
公开(公告)日：1986-12-02
申请号：US765796
申请日：1985-08-15
申请人： Rajamouli Gunda , Melvin A. Rode
发明人： Rajamouli Gunda , Melvin A. Rode
CPC分类号： G05D3/18 , F15B21/087 , G05B19/351 , G05B2219/34215 , G05B2219/34236 , G05B2219/35438 , G05B2219/36429 , G05B2219/37462 , G05B2219/41302 , G05B2219/42237
摘要： A system and method for pulse-width modulation of multiple solenoid-operated valves in an electrohydraulic servo system employing a microprocessor-based digital controller. Solenoid-energization pulse widths are identified by comparison of operator command input signals to feedback signals responsive to actual motion at the actuators and loads. During each modulation period, all solenoids are initially selectively simultaneously energized as a function of binary information stored in an energization control register, and the shortest energization pulse duration is identified. After a delay corresponding to such shortest duration, during which the microprocessor may perform other control functions, the solenoids associated with such shortest duration are selectively de-energized as a function of binary information stored in a de-energization control register. The next-shortest duration is then identified, and the process again delays for a time equal to the difference between such next-shortest duration and the previous duration. The process of identifying pulse durations of increasing length and correspondingly deenergizing the solenoids continues until all pulse durations have been accommodated or until the modulation period terminates, at which point the entire control process rebegins.
摘要翻译： 一种采用基于微处理器的数字控制器的电动液压伺服系统中多个电磁阀的脉宽调制系统和方法。 通过将操作员命令输入信号与响应于执行器和负载处的实际运动的反馈信号进行比较来识别电磁阀通电脉冲宽度。 在每个调制周期期间，根据存储在通电控制寄存器中的二进制信息的函数，所有螺线管最初被选择性地同时通电，并且识别最短的通电脉冲持续时间。 在对应于这样最短持续时间的延迟之后，微处理器可以执行其他控制功能，与这样最短持续时间相关联的螺线管根据存储在断电控制寄存器中的二进制信息的功能被选择性地断电。 然后识别下一个最短的持续时间，并且处理再次延迟等于这样的下一个最短持续时间和先前持续时间之间的差值的时间。 识别增加长度的脉冲持续时间并相应地断电螺线管的过程继续进行，直到所有脉冲持续时间已经被适应或者直到调制周期终止为止，在整个控制过程进行到达时间。
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公开(公告)号：US4096831A
公开(公告)日：1978-06-27
申请号：US729068
申请日：1976-10-04
申请人： Rajamouli Gunda
发明人： Rajamouli Gunda
CPC分类号： F02D41/064
摘要： A frequency modulated control circuit for an electronic fuel injection system to control the pulse-type injection of fuel at a single point of the fuel intake of an internal combustion engine in accordance with the derived mass air flow rate into the engine comprising a pressure sensor for sensing the manifold pressure of the internal combustion engine, and an engine speed sensor, both of which generate an analog signal which are multiplied by a multiplier circuit to provide a signal representative of the mass air flow to the engine. The multiplier circuit includes a separate control input for varying the output signal level of the multiplier circuit by a preselected factor determined by the final output of the control circuit. The output of the multiplier circuit is fed to a voltage controlled oscillator to produce an output signal taking the form of a pulse train, the frequency of which varies with the amplitude of the mass air flow signal. The output of the voltage controlled oscillator is fed to a pulse generator which generates a fixed on-time pulse for each pulse in the pulse train being fed from the voltage controlled oscillator. The output of the pulse generator is sensed by a duty cycle switch which senses when the output frequency of the voltage controlled oscillator results in a high duty cycle for the output pulses. In this high duty cycle situation, the output analog signal of the multiplier is reduced by a preselected fraction. The duty cycle switch also generates an output signal which varies the duration of the pulse output from the pulse generator as a reciprocal of the variation being applied to the multiplier from the duty cycle switch or enable a secondary injector. The system also includes a temperature sensor and coolant temperature circuit which generates an analog voltage signal which varies as a function of the engine coolant temperature. The temperature analog signal, designated V.sub.H.sbsb.2.sub.O, is fed to a cold start circuit to control the output pulse width from the cold start circuit.
摘要翻译： 一种用于电子燃料喷射系统的频率调制控制电路，用于根据导入到发动机的导出的质量空气流量来控制在内燃机的燃料进口的单个点处的燃料的脉冲型喷射，该压力传感器包括用于 感测内燃机的歧管压力和发动机转速传感器，两者都产生模拟信号，该模拟信号乘以乘法器电路以提供表示向发动机的质量空气流的信号。 乘法器电路包括单独的控制输入，用于通过由控制电路的最终输出确定的预选因子来改变乘法器电路的输出信号电平。 乘法器电路的输出被馈送到压控振荡器以产生采取脉冲串形式的输出信号，其频率随质量空气流信号的幅度而变化。 压控振荡器的输出被馈送到脉冲发生器，该脉冲发生器为从压控振荡器馈送的脉冲串中的每个脉冲产生固定的接通时间脉冲。 脉冲发生器的输出由占空比开关感测，该占空比开关感测压控振荡器的输出频率何时导致输出脉冲的高占空比。 在这个高占空比的情况下，乘法器的输出模拟信号被预选的分数降低。 占空比开关还产生一个输出信号，该输出信号改变从脉冲发生器输出的脉冲的持续时间，作为从占空比开关施加到乘法器的变化的倒数或启用次级注入器。
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公开(公告)号：US4023442A
公开(公告)日：1977-05-17
申请号：US593834
申请日：1975-07-07
CPC分类号： B60W10/06 , B60W10/04 , B60W10/103 , B60W30/18 , Y10T477/623 , Y10T477/636
摘要： This invention describes a system of control for a power source-transmission-load system such as might be used on an off-the-road vehicle, for example. The power source is an internal combustion engine having a known optimum characteristic of desired manifold vacuum versus engine speed. The transmission is a hydrostatic or hydromechanical transmission having infinitely variable speed ratio and having a control means for varying said speed ratio.The control system includes a transducer means for measuring engine speed and converting this quantity into an analog fluid pressure proportional to the speed. This analog fluid pressure proportional to speed is modified in a function generator to produce an analog fluid pressure which is proportional to the desired manifold vacuum as a function of engine speed. Means are provided for measuring the actual manifold vacuum and for comparing the actual manifold vacuum with the desired manifold vacuum on a continuous basis. This comparison produces an error signal which is amplified and used to control a hydraulic system to operate the control means in order to vary the transmission ratio of the hydrostatic or hydromechanical transmission to obtain a speed ratio such that will provide optimum engine conditions.
摘要翻译： 本发明描述了例如可以用在越野车辆上的电源 - 传输 - 负载系统的控制系统。 电源是具有所需歧管真空与发动机转速的已知最佳特性的内燃机。 变速器是具有无级变速比的静液压或液压机械变速器，并具有用于改变所述变速比的控制装置。
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