公开(公告)号：US09366272B2

公开(公告)日：2016-06-14

申请号：US13963150

申请日：2013-08-09

Applicant: Caterpillar Inc.

Inventor： Susan E. Bieker ,  Eric P. Jakubiak ,  Dennis R. Barber ,  John J. Kaufman ,  Edward W. Mate ,  Scott D. Vollmer ,  Michael D. Hudson ,  Moses I. Akpan

IPC: F15B15/02 ,  E02F9/08 ,  E02F9/22 ,  F16H61/433 ,  F16H61/465 ,  F01P7/04

CPC classification number: F15B15/02 ,  E02F9/0866 ,  E02F9/0875 ,  E02F9/226 ,  F01P7/044 ,  F15B2211/40515 ,  F15B2211/40592 ,  F15B2211/41581 ,  F15B2211/46 ,  F15B2211/50509 ,  F15B2211/605 ,  F16H61/433 ,  F16H61/465

Abstract: A hydraulic fan circuit is provided. The hydraulic fan circuit includes a tank, a motor having a fluid inlet and a fluid outlet and a pump to draw fluid at a low pressure from the tank and discharge the fluid at elevated pressures to the motor via the fluid inlet. The hydraulic fan circuit further includes a directional control valve disposed between the fluid outlet of the motor and the tank. The directional control valve is operable to move between a flow blocking position and a flow passing position. Further, the directional control valve is configured to reduce a positive speed of the motor below a lowest positive speed attainable through control of pump output. Furthermore, the hydraulic fan circuit includes a pressure control circuit configured to provide a pilot fluid flow at varying pressure to move the directional control valve.

Abstract translation: 提供液压风扇电路。 液压风扇回路包括油箱，具有流体入口和流体出口的马达和用于从罐中抽取低压的流体并经由流体入口将流体以升高的压力排出到马达的泵。 液压风扇回路还包括设置在电动机的流体出口和罐之间的方向控制阀。 方向控制阀可操作以在阻流位置和流动通过位置之间移动。 此外，方向控制阀被配置为将电动机的正转速降低到通过控制泵输出可获得的最低正向速度。 此外，液压风扇回路包括压力控制回路，该压力控制回路构造成在变化的压力下提供先导流体流动以移动方向控制阀。

公开(公告)号：US11318988B2

公开(公告)日：2022-05-03

申请号：US16247056

申请日：2019-01-14

Applicant: Caterpillar Inc.

Inventor： Edward W. Mate ,  John R. Connolly

IPC: B62D5/06 ,  B62D5/087

Abstract: An autonomous steering control unit for a hydraulic steering control system has a pilot selector valve, primary and secondary electro-hydraulic (EH) steering valves, and an output selector valve. In a primary autonomous steering mode, the primary EH steering valve operates to output pilot fluid from the pilot selector valve through the output selector valve to the steering control system to control steering of a work machine while the pilot selector valve and the output selector valve isolate the secondary EH steering valve from the steering control system. In a secondary autonomous steering mode, the secondary EH steering valve operates to output pilot fluid through the output selector valve to the steering control system while the primary EH steering valve is isolated from the steering control system. In alternative embodiments, a load sense selector valve alternately connects an dynamic load sense line to the operative steering valve.

公开(公告)号：US20140182277A1

公开(公告)日：2014-07-03

申请号：US13727831

申请日：2012-12-27

Applicant: CATERPILLAR INC.

Inventor： Beau Kuipers ,  Wendell D. Stahl ,  Edward W. Mate ,  Joshua M. Adams ,  Shawn I. Cullen

IPC: B62D5/09

CPC classification number: B62D5/09 ,  B62D5/091 ,  B62D9/00 ,  B62D12/00

Abstract: An electro-hydraulic steering system for an articulated machine includes an electrical circuit and a hydraulic circuit. The electrical circuit includes a controller, an electro-hydraulic valve assembly, and a spool position system. The hydraulic circuit includes a pump, at least one cylinder in selective fluid communication with the pump, and the valve assembly. The controller includes a computer-readable storage medium storing a steering system monitoring application which performs several steps. A desired flow of pressurized fluid to each cylinder and a desired spool position for the spool of the electro-hydraulic valve assembly, based upon the desired flow of pressurized fluid, are determined. The desired spool position and an actual spool position are compared to determine a spool-based flow error, which is summed over a period of time to determine a cumulative spool-based flow error. An event warning is issued when the cumulative spool-based flow error exceeds a threshold.

Abstract translation: 铰接式机械的电动液压转向系统包括电路和液压回路。 电路包括控制器，电动液压阀组件和阀芯位置系统。 液压回路包括泵，至少一个与泵选择性流体连通的气缸和阀组件。 控制器包括存储执行几个步骤的转向系统监视应用的计算机可读存储介质。 确定加压流体到每个气缸的期望流量以及基于加压流体的期望流量的电液压阀组件的阀芯的期望阀芯位置。 比较所需的阀芯位置和实际阀芯位置以确定基于阀芯的流量误差，该误差在一段时间内相加以确定基于阀芯的累积流量误差。 当累积的基于假脱机的流量错误超过阈值时，将发出事件警告。

公开(公告)号：US20150040548A1

公开(公告)日：2015-02-12

申请号：US13963150

申请日：2013-08-09

Applicant: Caterpillar Inc.

Inventor： Susan E. Bieker ,  Eric P. Jakubiak ,  Dennis R. Barber ,  John J. Kaufman ,  Edward W. Mate ,  Scott D. Vollmer ,  Michael D. Hudson ,  Moses I. Akpan

IPC: F15B15/02

CPC classification number: F15B15/02 ,  E02F9/0866 ,  E02F9/0875 ,  E02F9/226 ,  F01P7/044 ,  F15B2211/40515 ,  F15B2211/40592 ,  F15B2211/41581 ,  F15B2211/46 ,  F15B2211/50509 ,  F15B2211/605 ,  F16H61/433 ,  F16H61/465

Abstract: A hydraulic fan circuit is provided. The hydraulic fan circuit includes a tank, a motor having a fluid inlet and a fluid outlet and a pump to draw fluid at a low pressure from the tank and discharge the fluid at elevated pressures to the motor via the fluid inlet. The hydraulic fan circuit further includes a directional control valve disposed between the fluid outlet of the motor and the tank. The directional control valve is operable to move between a flow blocking position and a flow passing position. Further, the directional control valve is configured to reduce a positive speed of the motor below a lowest positive speed attainable through control of pump output. Furthermore, the hydraulic fan circuit includes a pressure control circuit configured to provide a pilot fluid flow at varying pressure to move the directional control valve.

Abstract translation: 提供液压风扇电路。 液压风扇回路包括油箱，具有流体入口和流体出口的马达和用于从罐中抽取低压的流体并经由流体入口将流体以升高的压力排出到马达的泵。 液压风扇回路还包括设置在电动机的流体出口和罐之间的方向控制阀。 方向控制阀可操作以在阻流位置和流动通过位置之间移动。 此外，方向控制阀被配置为将电动机的正转速降低到通过控制泵输出可获得的最低正向速度。 此外，液压风扇回路包括压力控制回路，该压力控制回路构造成在变化的压力下提供先导流体流动以移动方向控制阀。

公开(公告)号：US20200223476A1

公开(公告)日：2020-07-16

申请号：US16247056

申请日：2019-01-14

Applicant: Caterpillar Inc.

Inventor： Edward W. Mate ,  John R. Connolly

IPC: B62D5/06 ,  B62D5/087 ,  G05D1/02

Abstract: An autonomous steering control unit for a hydraulic steering control system has a pilot selector valve, primary and secondary electro-hydraulic (EH) steering valves, and an output selector valve. In a primary autonomous steering mode, the primary EH steering valve operates to output pilot fluid from the pilot selector valve through the output selector valve to the steering control system to control steering of a work machine while the pilot selector valve and the output selector valve isolate the secondary EH steering valve from the steering control system. In a secondary autonomous steering mode, the secondary EH steering valve operates to output pilot fluid through the output selector valve to the steering control system while the primary EH steering valve is isolated from the steering control system. In alternative embodiments, a load sense selector valve alternately connects an dynamic load sense line to the operative steering valve.

公开(公告)号：US20170120884A1

公开(公告)日：2017-05-04

申请号：US14932671

申请日：2015-11-04

Applicant: Caterpillar Inc.

Inventor： Edward W. Mate ,  Zhangong Du ,  Shinya Sono

IPC: B60T17/22 ,  F16D66/02

CPC classification number: B60T17/221 ,  B60T2270/40 ,  B60T2270/88 ,  F16D66/02 ,  F16D2066/005

Abstract: A brake wear analysis system is presented for use within a work machine. The brake wear analysis system includes a brake charge system as well as at least one accumulator connected to the brake charge system. The at least one accumulator operable to flow a fluid from the accumulator to a brake control valve based on an executed braking action. A change of pressure within the at least one accumulator being received by a pressure sensor connected to the brake charge system and transmitted to a brake wear analysis module within the controller of the work machine. The brake wear analysis module being configured to compare the flow of fluid from the at least one accumulator with a predetermined condition resulting in a determination of whether or not a braking mechanism of the work machine is functioning in a worn condition.