Hydraulic derate stability control

Patent metadata

Field	Value
Publication number	US-2019264418-A1
Application number	US-201815908555-A
Country	US
Kind code	A1
Filing date	Feb 28, 2018
Priority date	Feb 28, 2018
Publication date	Aug 29, 2019
Grant date	—

Abstract

A work machine includes a mechanical arm and a work implement coupled to the mechanical arm. The work implement is configured to receive a load. A hydraulic actuator is coupled to the mechanical arm to move the arm between a first position and a second position. A sensor unit is configured to detect the load in the work implement. A valve is in fluid communication with the hydraulic actuator for supplying a fluid output to the hydraulic actuator. A controller is in communication with the value and the sensor unit. The controller is configured to transmit a control signal to the valve to adjust the fluid output to the hydraulic actuator, and wherein the controller is configured to derate the fluid output in response to a signal from the sensor unit that a load is at or above a threshold value.

First claim

What is claimed:

1 . A work machine comprising:
a mechanical arm; a work implement coupled to the mechanical arm, the work implement configured to receive a load; a hydraulic actuator coupled to the mechanical arm to move the arm between a first position and a second position; a sensor unit configured to detect the load in the work implement; a valve in fluid communication with the hydraulic actuator for supplying a fluid output to the hydraulic actuator; and. a controller in communication with the valve and the sensor unit, wherein the controller is configured to transmit a control signal to the valve to adjust the fluid output to the hydraulic actuator, and wherein the controller is configured to determine a derated fluid output in response to the load being at or above a threshold value.

2 . The work machine of claim 1 , wherein the controller is configured to derate the fluid output a first amount at the threshold value and to derate the fluid output a second amount above the threshold value.

3 . The work machine of claim 2 , wherein derating the fluid output includes increasing the time to reach a maximum value flowrate relative to a normal operation.

4 . The work machine of claim 1 , wherein derating the fluid output includes decreasing a maximum flowrate relative to a normal operation.

5 . The work machine of claim 1 , wherein the sensor unit includes a pressure sensor.

6 . The work machine of claim 5 , wherein the pressure sensor is operatively connected to the hydraulic actuator.

7 . The work machine of claim 1 , wherein the controller is a vehicle control unit.

8 . The work machine of claim wherein the threshold value is above 50% of a maximum load value.

9 . A work vehicle comprising:
a mechanical arm coupled to a vehicle body; a work implement coupled to the mechanical arm, the work implement configured to receive a load; a hydraulic actuator coupled to the mechanical arm to move the arm between a first position and a second position; a sensor unit configured to detect the load in the work implement; a valve in fluid communication with the hydraulic actuator for supplying a fluid output to the hydraulic actuator; a pump configured to discharge fluid to the valve; an engine operatively connected to the pump; and a controller in communication with the valve and the sensor unit, wherein the controller is configured to transmit a control signal to the valve to adjust a fluid output to the valve, and wherein the controller is configured to derate the fluid output in response the load being at or above a first setpoint value.

10 . The work vehicle of claim 9 , wherein the controller is configured to derate the valve a first amount when the load reaches the first setpoint value and to derate the valve a second amount when the load reaches a second setpoint value, wherein the second amount is greater than the first amount and the second. setpoint value is greater than the first setpoint value.

11 . The work vehicle of claim 10 , wherein the derate amount increases continuously between the first setpoint and the second setpoint.

12 . The work vehicle of claim 10 , wherein the derate amount increase in increments at setpoints between the first setpoint and the second setpoint.

13 . The work vehicle of claim 10 , wherein the first setpoint value is above 50% of a maximum load value and the second setpoint value is at 100 % of the maximum load value.

14 . The work vehicle of claim 9 , wherein the controller is connected to an operator input.

15 . The work vehicle of claim 9 , wherein the work implement includes a bucket pivotally connected to the boom arm.

16 . A work vehicle comprising:
a boom arm coupled to a vehicle body; a work implement coupled to the boom arm, the work implement configured to receive a load; a hydraulic actuator coupled to the boom arm to move the boom arm between a first position and a second position; a sensor unit configured to detect the load in the work implement; a valve in fluid communication with the hydraulic actuator for supplying fluid to the hydraulic actuator; an operator input configured to control the boom arm; a controller in communication with the operator input, the valve and the sensor unit, wherein the controller is configured to receive a movement signal from the operator input and transmit a control signal to the valve to provide a first flowrate of fluid to the hydraulic actuator during a normal operation and to transmit a derated control signal to the valve to provide a second flowrate of fluid in response a load being at or above a first setpoint value.

17 . The work vehicle of claim 16 , wherein the derated control signal increases the time to reach a maximum flowrate relative to the normal operation.

18 . The work vehicle of claim 16 , wherein derated control signal decreases a maximum flowrate relative to the normal operation.

19 . The work vehicle of claim 16 , wherein the sensor unit includes a pressure sensor.

20 . The work vehicle of claim 16 , wherein the controller is configured transmit a second derated control signal to the valve to provide a third flowrate of fluid in response to a signal from the sensor unit that a load is at or above a second setpoint value.

Assignees

• Deere & Co

Inventors

• Myers David J
• Lehmann Doug M
• Kenkel Aaron R
• Leinaar Kyle E
• Kellogg Brian K

Classifications

• E02F3/431

  for bucket-arms, front-end loaders, dumpers or the like · CPC title

• E02F9/2207 Primary

  for reducing or compensating oscillations · CPC title

• E02F9/2004

  Control mechanisms, e.g. control levers (control levers per se G05G) · CPC title

• E02F9/2225

  using pressure-compensating valves · CPC title

• E02F9/2267

  Valves or distributors (position of valves arrangements on upper-structures E02F9/0875) · CPC title