Valve block arrangement and method for a valve block arrangement

Patent metadata

Field	Value
Publication number	US-10655650-B2
Application number	US-201816016408-A
Country	US
Kind code	B2
Filing date	Jun 22, 2018
Priority date	Jun 27, 2017
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A valve block arrangement configured as a closed center system includes at least one main spool for controlling a hydraulic consumer. The main spool is configured to open and close at least one pressure medium connection between a hydraulic pump and the consumer in controlled, continuous fashion and, in at least one embodiment, is electrically activated. A bypass flow path with a cut valve branches off between the adjustable, hydraulic pump and the main spool. The cut valve is configured to open and close a pressure medium connection between the hydraulic pump and a tank in controlled, continuous fashion. The cut valve is electrically activatable.

First claim

What is claimed is:

1. A valve block arrangement, comprising:
a closed center valve block having at least one main spool configured to control a hydraulic consumer, the at least one main spool assigned a pressure port and a working port;
at least one hydraulic machine connected to the pressure port;
a bypass flow path branching off fluidically between the pressure port and the at least one hydraulic machine;
an electrically activated cut valve configured to connect the bypass flow path to a tank, the cut valve configured to throttle the bypass flow path; and
control electronics comprising:
a preset module configured to determine an item of load sensitivity information based on a preset value received for consumer input by an input unit, the item of load sensitivity information being inversely related to the preset value; and
an actuation module configured to generate an actuation signal for the cut valve based on the item of load sensitivity information.

2. The valve block arrangement according to claim 1 , further comprising:
at least one further main spool, the at least one further main spool configured in each case to control a respective further hydraulic consumer,
wherein each respective main spool of the at least one further main spool is assigned a respective pressure port and a respective working port,
wherein the at least one hydraulic machine is connected to each respective pressure port,
wherein the bypass flow path with the cut valve branches off fluidically between the respective pressure ports and the at least one hydraulic machine,
wherein the preset module is further configured to determine respective further items of load sensitivity information based on respective further preset values input by respective further input units, the further items of load sensitivity information being inversely related to the respective further preset values; and
the actuation module is further configured to generate the actuation signal for the cut valve based on the item of load sensitivity information and the further items of load sensitivity information.

3. The valve block arrangement according to claim 2 , wherein each respective spool of the at least one main spool and the at least one further main spool is assigned an adjustable throttle disposed fluidically between the pressure port of the respective spool and the hydraulic machine.

4. The valve block arrangement according to claim 2 , wherein one or more of (i) at least one of the main spools is adjustable in continuous fashion, (ii) the cut valve is openable and closable in controlled, continuous fashion, and (iii) the hydraulic machine is adjustable in continuous fashion.

5. The valve block arrangement according to claim 3 , wherein each adjustable throttle is configured such that a backflow of pressure medium from the associated consumer is prevented by the adjustable throttle.

6. The valve block arrangement according to claim 2 , wherein the pressure port of at least one of the main spools is connected to at least two hydraulic machines arranged fluidically in parallel.

7. The valve block arrangement according to claim 1 , wherein:
the control electronics further comprises an adaptation module configured to receive the preset value and convert the preset value into an adapted preset value, and
the preset module is configured to determine the item of load sensitivity information based on the adapted preset value.

8. The valve block arrangement according to claim 7 , wherein the preset module is further configured to convert the adapted preset value into one or more of a volume flow preset for the consumer and a maximum pressure for the consumer.

9. The valve block arrangement according to claim 8 , wherein the actuation module is further configured to generate additional actuation signals based on the adapted preset values, the additional actuation signals including one or more of a total volume flow preset for the hydraulic machine, a control variable for the main spool, and a control variable for at least one throttle that is arranged between the each respective spool of the at least one main spool and the at least one hydraulic machine.

10. The valve block arrangement according to claim 9 , wherein the actuation module is further configured to generate the additional actuation signals based on a load pressure of the consumer.

11. The valve block arrangement according to claim 9 , wherein the actuation module is further configured to generate the additional actuation signals based on a rotational speed of the hydraulic machine.

12. The valve block arrangement according to claim 7 , wherein the adaptation module, the preset module, and the actuation module are software modules.

13. The valve block arrangement according to claim 9 , wherein the actuation by the actuation signal and the additional actuation signals takes the form of non-feedback open-loop control.

14. A method for a valve block arrangement that includes a closed center valve block with at least one main spool configured to control a hydraulic consumer, the at least one main spool assigned a pressure port and a working port; at least one hydraulic machine connected to the pressure port; a bypass flow path branching off fluidically between the pressure port and the at least one hydraulic machine; and an electrically activated cut valve configured to connect the bypass flow path to a tank and to throttle the bypass flow path, the method comprising:
receiving a preset value for the consumer input by an input unit in an adaptation module;
converting one of the preset value and an adapted preset value adapted from the preset value into an item of load sensitivity information for the consumer with a preset module, the item of load sensitivity information being inversely related to the one of the preset value and the adapted preset value; and
generating an actuation signal for the cut valve based on the item of load sensitivity information in an actuation module.

Assignees

• Bosch Gmbh Robert

Inventors

• Werner Wilfried
• Szeles Botond
• Oschmann Sebastian

Classifications

• E02F9/2296 Primary

  Systems with a variable displacement pump · CPC title

• F15B2211/41509

  being connected to a pressure source and a directional control valve · CPC title

• F15B2211/45

  Control of bleed-off flow, e.g. control of bypass flow to the return line · CPC title

• F15B2211/6313

  the pressure being a load pressure · CPC title

• F15B2211/7142

  the output members being arranged in multiple groups · CPC title