Controlling operation of device with rechargeable energy storage pack based on propulsion loss assessment

Patent metadata

Field	Value
Publication number	US-2020180466-A1
Application number	US-201816214813-A
Country	US
Kind code	A1
Filing date	Dec 10, 2018
Priority date	Dec 10, 2018
Publication date	Jun 11, 2020
Grant date	—

Abstract

System and method of controlling operation of a device having a rechargeable energy storage pack with a plurality of cells, based on propulsion loss assessment. A controller is configured to obtain a state of charge data and an open circuit voltage of the rechargeable energy storage pack. The controller is configured to obtain a state of charge disparity factor (dSOC) from a selected dataset. The state of charge disparity factor (dSOC) is defined as a difference between a minimum value of the state of charge and an average value of the state of charge of the plurality of cells. The controller is configured to control operation of the device based in part on the state of charge disparity factor (dSOC) and a plurality of parameters (Pi), including raising one or more of a plurality of flags each transmitting respective information to a user.

First claim

What is claimed is:

1 . A system of controlling a device with a rechargeable energy storage pack having a plurality of cells, based on propulsion loss assessment, the system comprising:
a controller including a processor and tangible, non-transitory memory on which instructions are recorded, execution of the instructions by the processor causing the controller to:
obtain a state of charge and an open circuit voltage of the rechargeable energy storage pack;
determine a first SOC line and a second SOC line such that a ratio of the state of charge and the open circuit voltage is a constant between the first SOC line and the second SOC line, the state of charge at and above the first SOC line being defined as a selected dataset;
obtain a state of charge disparity factor (dSOC) from the selected dataset, the state of charge disparity factor (dSOC) being defined as a difference between a minimum value of the state of charge of the plurality of cells and an average value of the state of charge of the plurality of cells:
obtain a plurality of parameters based in part on the state of charge disparity factor (dSOC); and
control operation of the device based in part on the state of charge disparity factor (dSOC) and the plurality of parameters (P i ), including raising one or more of a plurality of flags each transmitting respective information to a user.

2 . The system of claim 1 , wherein the plurality of parameters (P i ) includes:
a disparity mean (M t ) obtained over a window size of W data transmissions, the disparity mean (M t ) at a time t being defined as:

M
t

=

1
W



∑

i
=
0

W
-
1



dSCO

t
-
i

.

3 . The system of claim 2 , wherein the plurality of parameters (P i ) includes:
a disparity slope (S t ) obtained over the window size of W data transmissions and based in part on the disparity mean (M t ), the disparity slope (S t ) at the time t being defined as:

S
t

=

∑

i
=
0

W
-
1



[

(

t
-
i
-

2

t

-
W
+
1

2

)

*

(

dSOC

t
-
i

-

M
t

)

]

∑

i
=
0

W
-
1



(

t
-
i
-

2

t

-
W
+
1

2

)

2

.

4 . The system of claim 2 , wherein the plurality of parameters (P i ) includes:
a disparity standard deviation (SD t ) obtained over the window size of W data transmissions and based in part on the disparity mean (M t ), the disparity standard deviation (SD t ) at the time t being defined as:

SD
t

=

∑

i
=
0

W
-
1



(

dSOC

t
-
i

-

M
t

)

2

W
-
1

Assignees

• Gm Global Tech Operations Llc

Inventors

• Sarwar Azeem
• Lu Xiangxing
• Spigno Ciro
• Moulliet Ryan B
• Piasecki Jeffrey S
• Cornelli Andrew J
• Wampler Ii Charles W
• Koch Brian J
• Leblanc Margaux
• Hatoum Gus

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/965

  obtained with the battery disconnected from the charge or discharge circuit · CPC title

• H02J7/933

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J7/52

  for charge balancing, e.g. equalisation of charge between batteries · CPC title

• B60L58/12 Primary

  responding to state of charge [SoC] · CPC title