Hydraulic control arrangement for supplying pressure medium to at least two hydraulic consumers

Patent metadata

Field	Value
Publication number	US-11268545-B2
Application number	US-202017079666-A
Country	US
Kind code	B2
Filing date	Oct 26, 2020
Priority date	Oct 30, 2019
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A hydraulic control arrangement for simultaneously supplying at least two hydraulic consumers with predefinable individual pressure medium flow rates includes a hydraulic pump having an adjustable swept volume, and at least two valve arrangements each including a variable metering restrictor and a pressure balance arranged downstream of the variable metering restrictor. Each pressure balance is configured to be acted on in an opening direction by pressure downstream of the respective variable metering restrictor and to be acted on in a closing direction by a highest load pressure or by a pressure derived therefrom. Each valve arrangement is arranged between a pump line, which leads away from the hydraulic pump, and a consumer of the at least two hydraulic consumers. The arrangement further includes an electronic control device, by which the hydraulic pump is actuatable such that it conveys a sum of the predefinable individual pressure medium flow rates.

First claim

The invention claimed is:

1. A hydraulic control arrangement for simultaneously supplying at least two hydraulic consumers with predefinable individual pressure medium flow rates, the hydraulic control arrangement comprising:
a hydraulic pump having an adjustable swept volume and configured to convey a sum of the predefinable individual pressure medium flow rates;
at least two valve arrangements, each respective valve arrangement comprising a respective variable metering restrictor and a respective pressure balance arranged downstream of the respective variable metering restrictor, wherein each respective pressure balance is configured to be acted on (i) in an opening direction by a pressure downstream of the respective variable metering restrictor, and (ii) in a closing direction by a highest load pressure or by a pressure derived therefrom, and wherein each respective valve arrangement is arranged between a pump line leading away from the hydraulic pump and a respective hydraulic consumer of the at least two hydraulic consumers; and
an electronic control device configured to actuate the variable metering restrictors with control signals, such that throughflow cross sections of the variable metering restrictors have the same ratios with respect to one another as the predefinable individual pressure medium flow rates,
wherein in a case that multiple of the variable metering restrictors are actuated simultaneously and, in an event of a supply deficit, the sum of the predefinable individual pressure medium flow rates exceeds a maximum conveying flow rate of the hydraulic pump and, for benefit of a preferential hydraulic consumer of the at least two hydraulic consumers, which is to be preferentially supplied with pressure medium, for the simultaneously actuated variable metering restrictors to be actuated with control signals, the ratios of which with respect to one another deviate from the ratios of the predefinable individual pressure medium flow rates,
wherein, in the event of the supply deficit, the throughflow cross section of the variable metering restrictor assigned to the preferential hydraulic consumer is, in the case of the same predefinable individual pressure medium flow rate for the preferential consumer, increased in size in relation to a case of sufficient conveying flow rate, and
wherein, in the case of the supply deficit, the throughflow cross section of the variable metering restrictor assigned to a lower-priority hydraulic consumer of the at least two hydraulic consumers is, in the case of the same predefinable individual pressure medium flow rate for the lower-priority hydraulic consumer, reduced in size in relation to a case of sufficient conveying flow rate.

2. The hydraulic control arrangement according to claim 1 , wherein, in the event of the supply deficit, the variable metering restrictor assigned to the preferential hydraulic consumer and the variable metering restrictor assigned to a lower-priority hydraulic consumer of the at least two hydraulic consumers are actuated such that, in relation to the case of sufficient conveying flow rate, the ratio between the control signal for the variable metering restrictor assigned to the preferential hydraulic consumer and the control signal for the variable metering restrictor assigned to the lower-priority hydraulic consumer is increased, and the pressure medium flow rate flowing to the preferential hydraulic consumer is reduced.

3. The hydraulic control arrangement according to claim 2 , wherein the variable metering restrictors are actuatable such that a minimum flow rate of pressure medium still flows to the lower-priority hydraulic consumer.

4. The hydraulic control arrangement according to claim 1 , wherein:
a group includes at least two equally preferential hydraulic consumers of the at least two hydraulic consumers, and
in the event of the supply deficit, the control signals to the variable metering restrictors assigned to the at least two equally preferential hydraulic consumers are changed proportionally in relation to the control signals in a case of sufficient conveying flow rate.

5. The hydraulic control arrangement according to claim 1 , wherein:
a group includes at least two equally lower-priority hydraulic consumers of the at least two hydraulic consumers, and
in the event of the supply deficit, the control signals to the variable metering restrictors assigned to the lower-priority hydraulic consumers are changed proportionally in relation to the control signals in a case of sufficient conveying flow rate.

6. The hydraulic control arrangement according to claim 5 , wherein, in the event of the supply deficit, a minimum flow rate still flows, in sum total, to the group of at least two equally lower-priority hydraulic consumers.

7. The hydraulic control arrangement according to claim 1 , wherein the electronic control device has an input for a signal which indicates a rotational speed of the hydraulic pump.

8. The hydraulic control arrangement according to claim 1 , wherein the hydraulic pump is configured for control with closed-loop volume flow control by the electronic control device, with a control signal corresponding to the sum of the predefinable individual pressure medium flow rates taking into consideration a rotational speed of the hydraulic pump, such that the hydraulic pump conveys the sum of the predefinable individual pressure medium flow rates.

9. The hydraulic control arrangement according to claim 1 , wherein:
the variable metering restrictors are each formed at a control slide valve, and
the control slide valve is electrohydraulically actuatable.

10. The hydraulic control arrangement according to claim 1 , further comprising:
at least one operator control element configured to generate signals corresponding to the predefinable individual pressure medium flow rates for the electronic control device.

Assignees

• Bosch Gmbh Robert

Inventors

• Szeles Botond
• Jerg Matthias

Classifications

• F15B2211/455

  Control of flow in the feed line, i.e. meter-in control · CPC title

• F15B2211/351

  Flow control by regulating means in feed line, i.e. meter-in control · CPC title

• F15B2211/3144

  the positions being continuously variable, e.g. as realised by proportional valves · CPC title

• F15B2211/6654

  Flow rate control · CPC title

• F15B2211/426

  electrically or electronically · CPC title