Prognostics in hydraulic transmission system using e-machine drive
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.
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 calibration data without a sensor external to the e-machine.
17 . The method of claim 13 , further comprising:
generating third calibration data of the e-machine;
determining whether the third calibration data is within a tolerance threshold of the first calibration data; and
deleting the first calibration data and re-generating the first calibration data in response to determining that the third calibration data is not within the tolerance threshold of the first calibration data.
18 . The method of claim 17 , wherein the generating the third calibration data includes generating 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.
19 . 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 interdependency of the plurality of valves and first calibration data based on a first torque profile of the e-machine at the first time,
generate second calibration data of the e-machine at a second time subsequent to the first time, the second calibration data based on a second torque profile of the e-machine at the second 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.