Prognostics in hydraulic transmission system using e-machine drive

Patent metadata

Field	Value
Publication number	US-12535091-B2
Application number	US-202318303874-A
Country	US
Kind code	B2
Filing date	Apr 20, 2023
Priority date	Apr 20, 2023
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A device for determining fluid degradation includes a memory and processing circuitry configured to cause the device to generate first calibration data of an e-machine at a first time, generate second calibration data of the e-machine at a second time subsequent to the first time, and determine that the fluid is degraded in response to a difference between the first calibration data and the second calibration data being greater than or equal to a degradation threshold.

First claim

What is claimed is:

1 . A device for determining fluid degradation, the device comprising:
a memory; and processing circuitry configured to cause the device to
characterize an interdependency of a plurality of valves by correlating output parameters, caused by actuation of each valve of the plurality of valves, with input parameters,
generate first calibration data of an electronic machine (e-machine) at a first time, the first calibration data based on the interdependency of the plurality of valves,
generate second calibration data of the e-machine at a second time subsequent to the first time,
determine that the fluid is degraded in response to a difference between the first calibration data and the second calibration data being greater than or equal to a degradation threshold,
determine that there is a leakage in response to the difference between the first calibration data and the second calibration data being outside of the degradation threshold, and
stop an operation of a hydraulic system in response to determining that there is a leakage, the hydraulic system including the e-machine.

2 . The device of claim 1 , wherein the processing circuitry is further configured to cause the device to:
generate the first calibration data based on at least one of a first current profile of the e-machine or a first torque profile of the e-machine at the first time; and generate the second calibration data based on at least one of a second current profile of the e-machine or a second torque profile of the e-machine at the second time.

3 . The device of claim 1 , wherein the processing circuitry is further configured to cause the device to generate the first calibration data and the second calibration data based on internal readings of the e-machine.

4 . The device of claim 1 , wherein the processing circuitry is further configured to cause the device to generate the first calibration data and the second calibration data without a sensor external to the e-machine.

5 . The device of claim 1 , wherein the processing circuitry is further configured to cause the device to:
generate third calibration data of the e-machine; determine whether the third calibration data is within a tolerance threshold of the first calibration data; and delete the first calibration data and re-generate the first calibration data in response to determining that the third calibration data is not within the tolerance threshold of the first calibration data.

6 . The device of claim 5 , wherein the processing circuitry is further configured to cause the device to generate the third calibration data based on at least one of a third current profile of the e-machine or a third torque profile of the e-machine.

7 . A system for determining fluid degradation, the system comprising:
a hydraulic pump; an electronic machine (e-machine) configured to drive the hydraulic pump; and processing circuitry configured to cause the system to
characterize an interdependency of a plurality of valves by correlating output parameters, caused by actuation of each valve of the plurality of valves, with input parameters,
generate first calibration data of an e-machine at a first time, the first calibration data based on the interdependency of the plurality of valves,
generate second calibration data of the e-machine at a second time subsequent to the first time,
determine that the fluid is degraded in response to a difference between the first calibration data and the second calibration data being greater than or equal to a degradation threshold,
determine that there is a leakage in response to the difference between the first calibration data and second calibration data being outside of the degradation threshold,
stop an operation of a hydraulic system in response to determining that there is a leakage, the hydraulic system including the e-machine.

8 . The system of claim 7 , wherein the processing circuitry is further configured to cause the system to:
generate the first calibration data based on at least one of a first current profile of the e-machine or a first torque profile of the e-machine at the first time; and generate the second calibration data based on at least one of a second current profile of the e-machine or a second torque profile of the e-machine at the second time.

9 . The system of claim 7 , wherein the processing circuitry is further configured to cause the system to generate the first calibration data and the second calibration data based on internal readings of the e-machine.

10 . The system of claim 7 , wherein the processing circuitry is further configured to cause the system to generate the first calibration data and the second calibration data without a sensor external to the e-machine.

11 . The system of claim 7 , wherein the processing circuitry is further configured to cause the system to:
generate third calibration data of the e-machine; determine whether the third calibration data is within a tolerance threshold of the first calibration data; and delete the first calibration data and re-generate the first calibration data in response to determining that the third calibration data is not within the tolerance threshold of the first calibration data.

12 . The system of claim 11 , wherein the processing circuitry is further configured to cause the system to generate the third calibration data based on at least one of a third current profile of the e-machine or a third torque profile of the e-machine.

13 . A method for determining fluid degradation of a hydraulic system, the method comprising:
characterizing an interdependency of a plurality of valves by correlating output parameters, caused by actuation of each valve of the plurality of valves, with input parameters; generating first calibration data of an electronic machine (e-machine) at a first time, the first calibration data based on the interdependency of the plurality of valves; generating second calibration data of the e-machine at a second time subsequent to the first time; determining that the fluid is degraded in response to a difference between the first calibration data and the second calibration data being greater than or equal to a degradation threshold; determining that there is a leakage in response to the difference between the first calibration data and the second calibration data being outside of the degradation threshold; and stopping an operation of the hydraulic system in response to determining that there is a leakage.

14 . The method of claim 13 ,
wherein the generating the first calibration data includes generating the first calibration data based on at least one of a first current profile of the e-machine or a first torque profile of the e-machine at the first time, and wherein the generating the second calibration data includes generating the second calibration data based on at least one of a second current profile of the e-machine or a second torque profile of the e-machine at the second time.

15 . The method of claim 13 ,
wherein the generating the first calibration data includes generating the first calibration data based on internal readings of the e-machine, and wherein the generating the second calibration data includes generating the second calibration data based on internal readings of the e-machine.

16 . The method of claim 13 ,
wherein the generating the first calibration data includes generating the first calibration data without a sensor external to the e-machine, and wherein the generating the second calibration data includes generating the second calibratio

Assignees

• Deere & Co

Inventors

• Gupta Subhabrata
• Gokhale Sourabha

Classifications

• F16N2260/18

  necessity of changing oil · CPC title

• F16N2200/12

  Viscosity · CPC title

• F01M2011/148

  by considering viscosity · CPC title

• F01M2011/14

  for indicating the necessity to change the oil · CPC title

• G01N33/2888

  Lubricating oil characteristics, e.g. deterioration (lubricating properties G01N33/30) · CPC title