Hydraulic driveline with a secondary module

Patent metadata

Field	Value
Publication number	US-10830347-B2
Application number	US-201716309617-A
Country	US
Kind code	B2
Filing date	Jun 12, 2017
Priority date	Jun 13, 2016
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A hydraulic driveline for a vehicle may have a main hydraulic circuit with a first hydraulic displacement unit and a second hydraulic displacement unit. The driveline may have a hydraulic accumulator assembly which is selectively fluidly connected to the main hydraulic circuit by one or more controllable valves of a first group of valves. The driveline may also have a first secondary module that has a first fluid communication of the hydraulic accumulator assembly with a first secondary hydraulic load of the hydraulic driveline. The first fluid communication may be one or more controllable valves that allow connecting the hydraulic accumulator assembly with the first secondary load or separating the hydraulic accumulator assembly from the first secondary load and that belong to a second group of valves. The controllable valves of the second group of valves are controllable independently of the controllable valves of the first group of valves.

First claim

The invention claimed is:

1. A hydraulic driveline for a vehicle, comprising:
a main hydraulic circuit with a first hydraulic displacement unit which is fluidly connected with a second hydraulic displacement unit said second hydraulic displacement unit forming a primary hydraulic load of the driveline, the first hydraulic displacement unit having a variable hydraulic displacement and being drivingly connected with a combustion engine,
wherein the driveline further comprises a hydraulic accumulator assembly which is selectively fluidly connected to the main hydraulic circuit by one or more controllable valves of a first group of valves,
wherein the driveline further comprises a first secondary module that comprises a first fluid communication of the hydraulic accumulator assembly with a first secondary hydraulic load of the hydraulic driveline,
wherein the first fluid communication comprises one or more controllable valves of a second group of valves that allow connecting the hydraulic accumulator assembly with the first secondary load or separating the hydraulic accumulator assembly from the first secondary load,
wherein the controllable valves of the second group of valves are controllable independently of the controllable valves of the first group of valves, and
wherein the fluid connection of the hydraulic accumulator assembly with the first secondary module is controllable independently of the fluid connection of the hydraulic accumulator assembly with the main hydraulic circuit.

2. The hydraulic driveline of claim 1 , wherein the driveline further comprises a second secondary module that comprises a second fluid communication of the hydraulic accumulator assembly with a second secondary hydraulic load of the hydraulic driveline wherein the second fluid communication comprises one or more controllable valves, that belong to the second group of valves.

3. The hydraulic driveline of claim 2 , wherein the hydraulic accumulator assembly is fluidly connectable with the second secondary module independently of the fluid connection of the hydraulic accumulator assembly with the main hydraulic circuit.

4. The hydraulic driveline of claim 2 , wherein the fluid connection of the hydraulic accumulator assembly with the second secondary module is controllable independently of the fluid connection of the hydraulic accumulator assembly with the main hydraulic circuit.

5. The hydraulic driveline of claim 1 , wherein the first secondary load is an auxiliary load.

6. The hydraulic driveline of claim 1 , wherein the first secondary load is a working hydraulic load.

7. The hydraulic driveline of claim 1 , wherein the second secondary load is an auxiliary load.

8. The hydraulic driveline of claim 1 , wherein the second secondary load is a working hydraulic load.

9. The hydraulic driveline of claim 1 , wherein the first fluid communication of the hydraulic accumulator assembly with a first secondary hydraulic load of the hydraulic driveline comprises a pressure regulation valve and/or a flow regulation valve.

10. The hydraulic driveline of claim 9 , wherein the second fluid communication of the hydraulic accumulator assembly with a second secondary hydraulic load of the hydraulic driveline comprises a pressure regulation valve or a flow regulation valve.

11. The hydraulic driveline of claim 1 , wherein the hydraulic accumulator assembly comprises at least one high pressure accumulator and at least one low pressure accumulator, wherein the pressure in the high pressure accumulator is higher than the pressure in the low pressure accumulator.

12. The hydraulic driveline of claim 11 , wherein the high pressure accumulator and the low pressure accumulator are each connected to a connection point of the fluid communication through one of two different controllable valves of the second group of controllable valves and wherein the connection point is fluidly connected or connectable to a secondary load, and wherein a pressure control valve is comprised between the high pressure accumulator and the connection point.

13. The hydraulic driveline of claim 12 , wherein the high pressure accumulator and the low pressure accumulator are each connected to a connection point of the fluid communication through one of two different controllable valves of the second group of controllable valves and wherein the connection point is fluidly connected or connectable to a secondary load, and wherein a pressure control valve or a flow control valve is comprised between the connection point and the secondary load.

14. A hydraulic driveline for a vehicle, comprising:
a main hydraulic circuit with a first hydraulic displacement unit which is fluidly connected with a second hydraulic displacement unit, said second hydraulic displacement unit forming a primary hydraulic load of the driveline, the first hydraulic displacement unit having a variable hydraulic displacement and being drivingly connected with a combustion engine,
wherein the driveline further comprises a hydraulic accumulator assembly which is selectively fluidly connected to the main hydraulic circuit by one or more controllable valves of a first group of valves,
wherein the driveline further comprises a first secondary module that comprises a first fluid communication of the hydraulic accumulator assembly with a first secondary hydraulic load of the hydraulic driveline,
wherein the first fluid communication comprises one or more controllable valves of a second group of valves that allow connecting the hydraulic accumulator assembly with the first secondary load or separating the hydraulic accumulator assembly from the first secondary load,
wherein the controllable valves of the second group of valves are controllable independently of the controllable valves of the first group of valves, and
wherein the hydraulic accumulator assembly may be fluidly connectable with the first secondary module independently of the fluid connection of the hydraulic accumulator assembly with the main hydraulic circuit.

15. The hydraulic driveline of claim 1 , wherein at least one secondary load is a working hydraulic function formed by a hydraulic boom or a mechanical tool that is driven hydraulically.

16. The hydraulic driveline of claim 14 , wherein at least one secondary load is an auxiliary function formed by a cooling fan for the combustion engine, a vehicle stabilizer, brakes of a vehicle or an actuator for a limited movement of a vehicle wheel.

17. The hydraulic driveline system of claim 14 , further comprising an electronic control unit that controls one or more or all controllable valves of the first group of valves.

18. The hydraulic driveline system of claim 14 , further comprising an electronic control unit that controls one or more or all controllable valves of the second group of valves.

19. A method of operating a hydraulic driveline, the method comprising:
providing a hydraulic driveline for a vehicle, the hydraulic driveline comprising:
a main hydraulic circuit with a first hydraulic displacement unit fluidly connected with a second hydraulic displacement unit, said second hydraulic displacement unit forming a primary hydraulic load of the driveline, the first hydraulic displacement unit having a variable hydraulic displacement and being drivingly connected with a combustion engine,
a hydraulic accumulator assembly selectively fluidly connected to the main hydraulic circuit by one or more controllable valves of a first group of valves, the hydraulic accumulator assembly comprising a high pressure accumulator and a low pressu

Assignees

• Dana Italia Srl

Inventors

• Giorgio Bort Carlos Maximiliano
• Moser Davide
• Ornella Giulio

Classifications

• F16H61/4096 Primary

  with pressure accumulators · CPC title

• B60K11/06

  with air cooling · CPC title

• E02F9/2217

  with energy recovery arrangements, e.g. using accumulators, flywheels · CPC title

• E02F9/2225

  using pressure-compensating valves · CPC title

• F16H61/4078 Primary

  Fluid exchange between hydrostatic circuits and external sources or consumers · CPC title