System and method for calibrating a hydraulic drive system

Patent metadata

Field	Value
Publication number	US-10167951-B2
Application number	US-201715404779-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Feb 11, 2016
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A method of adjusting a hydraulic drive system includes determining a forward park position value, a reverse park position value, an initial forward position value, and an initial reverse position value of a control device and using these values to calculate a forward buffer value and a reverse buffer value. The forward buffer value and the reverse buffer value are used to determine an adjustment amount for the drive system. The adjustment amount can be used to properly adjust a drive system to avoid system errors.

First claim

What is claimed:

1. A method of adjusting a hydraulic drive system, the method comprising:
operating a drive system having a control device that is operatively connected to a cable and a hydraulic pump, wherein movement of the control device is configured to cause movement of the cable and movement of the cable is configured to cause an adjustment in an output of the hydraulic pump;
determining, during the operating, a forward park position of the control device and a forward park value associated with the forward park position;
determining, during the operating, a reverse park position of the control device and a reverse park value associated with the reverse park position;
determining, during the operating, an initial forward position of the control device and an initial forward value associated with the initial forward position;
determining, during the operating, an initial reverse position of the control device and an initial reverse value associated with the initial reverse position;
using the forward park position value, the reverse park position value, the initial forward position value, and the initial reverse position value to calculate a forward buffer value and a reverse buffer value; and
using the forward buffer value and the reverse buffer value to determine an adjustment amount for the drive system.

2. The method of claim 1 , wherein determining the forward park position includes moving the control device from a forward limit position to a forward park position, and determining the reverse park position includes moving the control device from a reverse limit position to a reverse park position.

3. The method of claim 2 , wherein determining the forward park value comprises moving the control device from the forward limit position to the forward park position a plurality of times, determining a value associated with each time, and taking an average of the values to obtain the forward park value.

4. The method of claim 1 , wherein determining the forward park value includes obtaining a voltage value from a propulsion sensor.

5. The method of claim 1 , wherein determining the initial forward position includes moving the control device from a park position in a forward direction until initial activation of the pump is detected, and determining the initial reverse position includes moving the control device from the park position in a reverse direction until initial activation of the pump is detected.

6. The method of claim 1 , wherein the forward buffer value and the reverse buffer value are referenced to a table to determine the adjustment amount.

7. The method of claim 1 , wherein the adjustment amount relates to adjusting the position of the cable with respect to the pump.

8. The method of claim 7 , wherein the cable is connected to a wishbone arm and adjusting the position of the cable adjusts a length of the cable between the wishbone arm and the control device.

9. The method of claim 7 , wherein the position of the cable is adjusted by rotating a fastener.

10. The method of claim 1 , wherein the control device is a handle moveable in a slot.

11. The method of claim 1 , wherein the drive system includes a dead-band area wherein movement of the control device in the dead-band area does not cause an adjustment in the output of the hydraulic pump, and wherein the adjustment amount for the drive system correlates to an adjusting of the position of the dead-band area.

12. A method of adjusting a hydraulic drive system, the method comprising:
operating a drive system including a handle moveable in a slot, wherein movement of the handle is configured to adjust the movement of a vehicle;
determining, during the operating, a forward park position of the handle and a forward park value associated with the forward park position;
determining, during the operating, a reverse park position of the handle and a reverse park value associated with the reverse park position;
determining, during the operating, an initial forward position of the handle and a forward motion value associated with the initial forward position;
determining, during the operating, an initial reverse position of the handle and a reverse motion value associated with the initial reverse position;
using the forward park value, the reverse park value, the forward motion value, and the reverse motion value to calculate a forward buffer value and a reverse buffer value; and
using the forward buffer value and the reverse buffer value to determine an adjustment amount of the drive system.

13. The method of claim 12 , wherein calculating the forward buffer value comprises averaging the forward motion value and the reverse motion value, and subsequently subtracting the forward park value.

14. The method of claim 13 , wherein a DTC activation value is added to the average of the forward calibration value and the reverse calibration value prior to subtracting the forward park value.

15. The method of claim 12 , wherein calculating the reverse buffer value comprises averaging the forward motion value and the reverse motion value, and subsequently subtracting the reverse park value.

16. The method of claim 15 , wherein a DTC activation value is subtracted from the average of the forward motion value and the reverse motion value prior to subtracting the reverse park value.

17. The method of claim 12 , wherein the slot includes a forward portion, a reverse portion, and a dead-band portion where movement of the handle in the dead-band portion does not result in movement of the vehicle.

18. The method of claim 17 , wherein the adjustment amount corresponds to adjusting the position of the dead-band area.

19. The method of claim 18 , wherein the position of the dead-band area is adjusted by adjusting the position of a sheath of a cable operatively connected to the handle and to a hydraulic pump.

Assignees

• Deere & Co

Inventors

• Morrison Tom
• Rotole David V
• Thies Eric M
• Usasz Mitchell R
• Wright Walter Craig

Classifications

• F16H61/437 Primary

  Pump capacity control by mechanical control means, e.g. by levers or pedals · CPC title

• B60Y2200/222

  Harvesters · CPC title

• F16H61/4192

  Detecting malfunction or potential malfunction, e.g. fail safe · CPC title

• F04B9/10

  the fluid being liquid · CPC title