US 8,783,025 B2Granted

Split valve pump controlled hydraulic system

AssigneeDeere & Company

InventorsJahmy J Hindman, Jeffrey W Dobchuk, Eric Richard Anderson

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Abstract

A hydraulic system that includes a controller controlling multiple hydraulic pumps to power multiple hydraulic functions. Any ratio of flow can be directed from each of the pumps to each of the functions, including having a pump dedicated to each function, or having one pump dedicated to one function and another pump supplying multiple functions including the one function. The controller can receive machine feedback and failure data indicating regions of the system with functional disruptions, and can direct flow from the pumps to the functions along routes that avoid the functional disruptions. The system can include operator input devices that provide operator inputs to the controller for controlling the system. The system can operate the hydraulic system in different modes, including modes to improve fuel efficiency and to improve productivity. The system can include a mode switch for operator selection of a desired mode.

Claims19

Dependent claims

A hydraulic system comprising:

a first hydraulic source;
a second hydraulic source;
a first function actuator for performing a first function;
a second function actuator for performing a second function;
a first valve stack comprising a first valve for controlling flow from the first hydraulic source to the first function actuator, and a second valve for controlling flow from the first hydraulic source to the second function actuator;
a second valve stack comprising a first valve for controlling flow from the second hydraulic source to the first function actuator, and a second valve for controlling flow from the second hydraulic source to the second function actuator;
a controller for controlling flow from the first hydraulic source to the first function actuator through the first valve of the first valve stack, and for controlling flow from the first hydraulic source to the second function actuator through the second valve of the first valve stack, and for controlling flow from the second hydraulic source to the first function actuator through the first valve of the second valve stack, and for controlling flow from the second hydraulic source to the second function actuator through the second valve of the second valve stack;
wherein the controller receives failure data indicating regions of the system with functional disruptions, and the controller uses the failure data to direct flow from the first and second hydraulic sources to the first and second function actuators along a route that avoids the regions of the system with functional disruptions.

5 more elements

A control method for a hydraulic system of a machine, the hydraulic system comprising first and second hydraulic pumps to power first and second hydraulic functions of the machine, the hydraulic system being able to direct any ratio of flow from the first hydraulic pump to the first and second functions and from the second hydraulic pump to the first and second functions, the control method comprising:

receiving operator input for performing the hydraulic functions;
receiving physical feedback from the machine;
determining a determined operating mode for the machine using the operator input and the machine physical feedback;
determining power availability of the hydraulic system using the determined operating mode and the machine physical feedback;
detecting fault modes of the machine using the machine physical feedback;
determining a flow map for the hydraulic system using the power availability and the detected fault modes, the flow map defining an amount of flow from the first hydraulic pump to the first hydraulic function, an amount of flow from the first hydraulic pump to the second hydraulic function, an amount of flow from the second hydraulic pump to the first hydraulic function, and an amount of flow from the second hydraulic pump to the second hydraulic function;
sending pump control commands to the first and second pumps to implement the flow map;
and
sending valve control commands to valves and actuators of the hydraulic system to implement the flow map.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/036,850Filed 28 Feb 2011
Published: US 2012/0216871 A130 Aug 2012
Granted: 22 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F15B 11/17
With two or more servomotors: using two or more pumps
F15B 2211/20553
Variable capacity: with pilot circuit, e.g. for controlling a swash plate
F15B 2211/20576
Systems with pumps: with multiple pumps
F15B 2211/3059
Assemblies of multiple valves: having multiple valves for multiple output members

Family

US 2012/0216871 A1Pre-grant publication · published 30 Aug 2012
US 8,783,025 B2This patent

From the US filing history. Foreign family members aren’t listed.

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