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公开(公告)号：US20170058876A1
公开(公告)日：2017-03-02
申请号：US14839128
申请日：2015-08-28
申请人： Caterpillar Inc.
发明人： Kevin J. Graf , Kaimei Sun , Hongliu Du
CPC分类号： F04B1/188 , F04B1/2021 , F04B1/2042 , F04B1/205 , F04B1/2057 , F04B1/303 , F04B1/32 , F04B1/324
摘要： A port plate for a swashplate type axial piston pump is described herein. The port plate includes an inlet port, a discharge port, and a first metering notch in fluidic communication via a first passage with a metering notch area adjustment valve configured to adjust the effective area of the metering notch. The first metering notch is disposed at a leading edge of one of the inlet port or the discharge port.
摘要翻译： 本文描述了用于斜盘式轴向柱塞泵的端口板。 端口板包括入口端口，排出口和经由第一通道流体连通的第一计量凹口，配置有调节计量凹口的有效面积的计量切口区域调节阀。 第一计量槽口设置在入口或排出口之一的前缘。
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公开(公告)号：US20150337871A1
公开(公告)日：2015-11-26
申请号：US14285998
申请日：2014-05-23
申请人： Caterpillar Inc.
发明人： Hongliu Du
IPC分类号： F15B13/044 , F15B19/00 , F15B11/08
CPC分类号： F15B13/044 , E02F9/2235 , E02F9/2296 , F15B11/08 , F15B19/00 , F15B2211/405 , F15B2211/63
摘要： A hydraulic control system for a machine is disclosed. The hydraulic control system may include a pump configured to pressurize fluid, a displacement control valve configured to affect displacement of the pump, and a solenoid configured to bias the displacement control valve to a zero position. The hydraulic control system may also include a controller in communication with the solenoid. The controller may be configured to estimate a bias current that biases the displacement control valve to the zero position, and to control the displacement control valve based on the bias current. The controller also be further configured to monitor a pump parameter of the pump, and to determine a control error associated with the pump parameter. The controller may further be configured to selectively adjust the bias current based on the control error.
摘要翻译： 公开了一种用于机器的液压控制系统。 液压控制系统可以包括构造成对流体加压的泵，配置成影响泵的位移的排量控制阀和构造成将排量控制阀偏置到零位置的螺线管。 液压控制系统还可以包括与螺线管连通的控制器。 控制器可以被配置为估计将位移控制阀偏置到零位置的偏置电流，并且基于偏置电流来控制位移控制阀。 控制器还被配置为监测泵的泵参数，并且确定与泵参数相关联的控制误差。 控制器还可以被配置为基于控制误差来选择性地调整偏置电流。
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公开(公告)号：US10227964B2
公开(公告)日：2019-03-12
申请号：US14839128
申请日：2015-08-28
申请人： Caterpillar Inc.
发明人： Kevin J. Graf , Kaimei Sun , Hongliu Du
摘要： A port plate for a swashplate type axial piston pump is described herein. The port plate includes an inlet port, a discharge port, and a first metering notch in fluidic communication via a first passage with a metering notch area adjustment valve configured to adjust the effective area of the metering notch. The first metering notch is disposed at a leading edge of one of the inlet port or the discharge port.
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公开(公告)号：US09404516B1
公开(公告)日：2016-08-02
申请号：US14599238
申请日：2015-01-16
申请人： Caterpillar Inc.
发明人： Hongliu Du , Aleksandar Egelja , Santosh Ancha
CPC分类号： F15B19/005 , E02F9/2235 , E02F9/2292 , E02F9/2296 , E02F9/268 , F15B15/20 , F15B19/007 , F15B2211/20546 , F15B2211/20576 , F15B2211/6309 , F15B2211/633 , F15B2211/6333 , F15B2211/665 , F15B2211/87 , F15B2211/875 , G01M15/05 , G01N2030/326
摘要： A system for determining an estimated output from a variable displacement hydraulic pump includes a prime mover, and torque, pressure, and displacement sensors. A controller determines the output torque from the prime mover, determines an input torque to the variable displacement hydraulic pump based upon the output torque, determines an output from one of the pressure sensor and the displacement sensor, and determines an inertia torque loss based upon the angular acceleration of the prime mover. The controller further determines a failure of another of the pressure sensor and the displacement sensor and determines an estimated output from the another of the pressure sensor and the displacement sensor based upon the input torque to the variable displacement hydraulic pump, the output from the one of the pressure sensor and the displacement sensor, and the inertia torque loss.
摘要翻译： 用于确定来自可变排量液压泵的估计输出的系统包括原动机和扭矩，压力和位移传感器。 控制器确定来自原动机的输出扭矩，基于输出转矩确定到可变排量液压泵的输入扭矩，确定来自压力传感器和位移传感器中的一个的输出，并且基于 原动机的角加速度。 控制器进一步确定另一个压力传感器和位移传感器的故障，并且基于来自可变排量液压泵的输入扭矩确定压力传感器和位移传感器中的另一个的估计输出， 压力传感器和位移传感器，以及惯性转矩损失。
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公开(公告)号：US09869311B2
公开(公告)日：2018-01-16
申请号：US14716162
申请日：2015-05-19
申请人： Caterpillar Inc.
发明人： Hongliu Du , Ronald D. Shinogle
CPC分类号： F04B51/00 , E02F9/2235 , E02F9/2296 , E02F9/264 , F04B1/324 , F04B17/05 , F04B27/14 , F04B49/002 , F04B49/128
摘要： A system for determining an estimated displacement of a variable displacement hydraulic pump includes a control cylinder associated with the swash plate of the variable displacement hydraulic pump to control the angle of inclination of the swash plate and a valve that controls the flow of hydraulic fluid to the control cylinder and has a position that defines an effective area of an opening of the valve. A pressure sensor generates pressure signals indicative of an output pressure from the variable displacement hydraulic pump. A controller is configured to receive pressure signals from the pressure sensor and determine an estimated displacement of the variable displacement hydraulic pump based upon the pressure signals from the pressure sensor and the position of the valve.
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公开(公告)号：US09534616B2
公开(公告)日：2017-01-03
申请号：US14599220
申请日：2015-01-16
申请人： Caterpillar Inc.
发明人： Santosh Ancha , Aleksandar Egelja , Hongliu Du , Takayuki Sasaki
CPC分类号： F15B19/005 , E02F9/2235 , E02F9/2278 , E02F9/2292 , E02F9/2296 , F15B19/007 , F15B2211/20523 , F15B2211/20546 , F15B2211/20576 , F15B2211/6309 , F15B2211/633 , F15B2211/6333 , F15B2211/6652 , F15B2211/855 , F15B2211/862 , F15B2211/87 , F15B2211/8752
摘要： A system for determining an estimated output from a variable displacement hydraulic pump includes a prime mover, a torque sensor, a pressure sensor, and a displacement sensor. A controller is configured to determine the output torque from the prime mover, determine an input torque to the variable displacement hydraulic pump based upon the output torque, determine an output from one of the pressure sensor and the displacement sensor based upon the signals. The controller is further configured to determine a failure of another of the pressure sensor and the displacement sensor and determine an estimated output from the another of the pressure sensor and the displacement sensor based upon the input torque to the variable displacement hydraulic pump and the output from the one of the pressure sensor and the displacement sensor.
摘要翻译： 用于确定来自可变排量液压泵的估计输出的系统包括原动机，扭矩传感器，压力传感器和位移传感器。 控制器被配置为确定来自原动机的输出扭矩，基于输出扭矩确定到可变排量液压泵的输入扭矩，基于该信号确定压力传感器和位移传感器之一的输出。 所述控制器还被配置成确定所述压力传感器和所述位移传感器中的另一个的故障，并基于所述可变排量液压泵的输入扭矩确定来自所述压力传感器和所述位移传感器中的另一个的估计输出， 压力传感器和位移传感器之一。
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公开(公告)号：US20160341193A1
公开(公告)日：2016-11-24
申请号：US14716162
申请日：2015-05-19
申请人： Caterpillar Inc.
发明人： Hongliu Du , Ronald D. Shinogle
CPC分类号： F04B51/00 , E02F9/2235 , E02F9/2296 , E02F9/264 , F04B1/324 , F04B17/05 , F04B27/14 , F04B49/002 , F04B49/128
摘要： A system for determining an estimated displacement of a variable displacement hydraulic pump includes a control cylinder associated with the swash plate of the variable displacement hydraulic pump to control the angle of inclination of the swash plate and a valve that controls the flow of hydraulic fluid to the control cylinder and has a position that defines an effective area of an opening of the valve. A pressure sensor generates pressure signals indicative of an output pressure from the variable displacement hydraulic pump. A controller is configured to receive pressure signals from the pressure sensor and determine an estimated displacement of the variable displacement hydraulic pump based upon the pressure signals from the pressure sensor and the position of the valve.
摘要翻译： 用于确定可变排量液压泵的估计位移的系统包括与可变排量液压泵的斜盘相关联的控制缸，以控制斜盘的倾斜角度以及控制液压流体流向 并且具有限定阀的开口的有效面积的位置。 压力传感器产生表示来自可变排量液压泵的输出压力的压力信号。 控制器被配置为从压力传感器接收压力信号，并且基于来自压力传感器的压力信号和阀的位置来确定可变排量液压泵的估计位移。
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8.发明授权公开(公告)号：US10323384B2
公开(公告)日：2019-06-18
申请号：US15373074
申请日：2016-12-08
申请人： Caterpillar Inc.
发明人： Vickram Murugesan , Hongliu Du , Lonnie James Devier , Frank Breier , Mandi Henderson , Matthew James Beschorner
摘要： A ride control system includes four independent metering valves (IMVs) that are independently and selectively controlled by a controller for attenuating oscillations in a hydraulic actuator of a machine. The controller is configured to open at least one of the IMVs for supplying pressurized fluid from a tank to a head end chamber of the hydraulic actuator when a pressure of the head end chamber drops to a value less than an initially registered pressure. Additionally, when the displacement of the piston block is positive and the pressure in the head end chamber falls to a value less than the pressure of fluid in a rod end chamber of the hydraulic actuator, the controller may also open another one of the IMVs by which fluid from the rod end chamber could be supplied to the head end chamber for supplementing pump flow and attenuating oscillations in the hydraulic actuator.
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公开(公告)号：US10145396B2
公开(公告)日：2018-12-04
申请号：US15380708
申请日：2016-12-15
申请人： Caterpillar Inc.
发明人： Hongliu Du , Joseph R. Robey
摘要： An energy recovery system includes cylinders that articulate a hydraulic tool in a pump mode to provide potential energy and in a motor mode to recover the potential energy. The energy recovery system includes a tank that stores a hydraulic fluid for the cylinders and an open circuit variable displacement pump that circulates the hydraulic fluid in the pump mode from the tank to the cylinders and in the motor mode from the cylinders to the tank. The open circuit variable displacement pump includes a swashplate articulable between a positive position and a negative position. In the positive position, the hydraulic fluid circulates in the pump mode and in the negative position the hydraulic fluid circulates in the motor mode. The open circuit variable displacement pump includes an actuator that articulates the swashplate and a bias system that maintains the swashplate in a positive position when the hydraulic fluid is not in circulation.
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10.发明申请公开(公告)号：US20180163373A1
公开(公告)日：2018-06-14
申请号：US15373074
申请日：2016-12-08
申请人： Caterpillar Inc.
发明人： Vickram Murugesan , Hongliu Du , Lonnie James Devier , Frank Breier , Mandi Henderson , Matthew James Beschorner
CPC分类号： E02F9/2207 , E02F3/283 , E02F9/0883 , E02F9/2228 , E02F9/2296 , F15B1/26 , F15B11/08 , F15B13/0401 , F15B2211/20546 , F15B2211/7051
摘要： A ride control system includes four independent metering valves (IMVs) that are independently and selectively controlled by a controller for attenuating oscillations in a hydraulic actuator of a machine. The controller is configured to open at least one of the IMVs for supplying pressurized fluid from a tank to a head end chamber of the hydraulic actuator when a pressure of the head end chamber drops to a value less than an initially registered pressure. Additionally, when the displacement of the piston block is positive and the pressure in the head end chamber falls to a value less than the pressure of fluid in a rod end chamber of the hydraulic actuator, the controller may also open another one of the IMVs by which fluid from the rod end chamber could be supplied to the head end chamber for supplementing pump flow and attenuating oscillations in the hydraulic actuator.
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