Jian J Lin

US Patent:

7768233, Aug 3, 2010

Filed:

Oct 4, 2007

Appl. No.:

11/867497

Inventors:

Jian Lin - Beverly Hills MI, US
Xidong Tang - Sterling Heights MI, US
Brian J. Koch - Berkley MI, US
Damon R. Frisch - Troy MI, US
Michael J. Gielniak - Romeo MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

H02J 7/00

US Classification:

320132, 324426, 324431

Abstract:

A method for determining the state of charge (SOC) of a lithium ion battery is provided. The method leverages a circuit model of the lithium ion battery, and generates four battery parameters from which the SOC is derived.

US Patent:

8054046, Nov 8, 2011

Filed:

Jan 23, 2008

Appl. No.:

12/018653

Inventors:

Jian Lin - Beverly Hills MI, US
Brian J. Koch - Berkley MI, US
Damon R. Frisch - Troy MI, US
Michael J. Gielniak - Romeo MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

H02J 7/04

US Classification:

320156, 320104, 320136, 903903

Abstract:

A method for rapidly determining an initial diffusion voltage (V)as a starting point in calculating a diffusion voltage in an electro-chemical cell (e. g. , a battery used in an automotive vehicle) includes obtaining a time difference tbetween a time when the cell was last turned-OFF and a time when the cell was next turned-ON, selecting a starting diffusion voltage (V)based on t, determining a trial diffusion voltage Vbased on a diffusion circuit model and (V), calculating an error voltage V=(V)−|V−V| where Vand Vare cell voltages at turn-OFF and turn-ON respectively, repeating the foregoing determining and calculating steps using for each iteration (V)=(V)+Vuntil Vis less than or equal to a first predetermined tolerance amount ε, storing in a memory a value of Vcorresponding to the condition V≦ε, and setting (V)equal to the just stored value of V. A further diffusion voltage Vis then determined using the same diffusion circuit model and the just obtained (V)and is advantageously used by a controller in an electric propulsion vehicle to determine a state of charge of the propulsion battery.

US Patent:

8170818, May 1, 2012

Filed:

Mar 10, 2010

Appl. No.:

12/721368

Inventors:

Jian Lin - Beverly Hills MI, US
Xidong Tang - Sterling Heights MI, US
Brian J. Koch - Berkley MI, US
Mark W. Verbrugge - Troy MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

G01R 31/36

US Classification:

702 63

Abstract:

A method for estimating vehicle battery parameters that uses two different sampling rates. The method samples a battery terminal voltage and current at a high sampling rate to estimate the battery open circuit voltage and high frequency resistance. The battery state of charge (SOC) is derived from the open circuit voltage. Next, the battery terminal voltage and current are re-sampled at a low sampling rate. Other battery parameters can be extracted from the low-rate sampled signals. Next, all of the battery parameters that were obtained from the two sampling rates are used together to predict battery power.

US Patent:

8552687, Oct 8, 2013

Filed:

Jun 5, 2008

Appl. No.:

12/134032

Inventors:

Jian Lin - Beverly Hills MI, US
Xidong Tang - Sterling Heights MI, US
Xiaodong Zhang - Mason OH, US
Brian J. Koch - Berkley MI, US
Damon R. Frisch - Troy MI, US
Wei Liu - Warren MI, US
Michael J. Gielniak - Atlanta GA, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

H02J 7/00

US Classification:

320132, 320166, 320167

Abstract:

Methods and systems are provided for characterizing a battery. A property of the battery is measured. A dynamic characteristic of the battery is determined from a second order linear dynamic model.

US Patent:

8624559, Jan 7, 2014

Filed:

Oct 14, 2010

Appl. No.:

12/904893

Inventors:

Asif A. Syed - Canton MI, US
Andrew H. Leutheuser - Sunnyvale CA, US
Jian Lin - Beverly Hills CA, US
Joseph M. Lograsso - Troy MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

H02J 7/14

US Classification:

320162, 320149, 320164

Abstract:

A method for controlling charging and discharging of a battery pack for an electric or hybrid vehicle to prevent overheating damage. Current flowing into or out of the battery pack is monitored, and root mean square (RMS) current is integrated over a time window and compared to a threshold to determine if power needs to be regulated in order to prevent damage to the cells in the battery pack. If the time-integrated RMS current exceeds the threshold, a closed-loop proportional-integral (PI) controller is activated to regulate power input or output. The controller will continue to regulate power until the time-integrated RMS current drops below the threshold. Various thresholds can be defined for different time windows. The gains used in the PI controller can also be adjusted to scale the amount of power regulation.

US Patent:

8207740, Jun 26, 2012

Filed:

Jun 23, 2009

Appl. No.:

12/489684

Inventors:

Jian Lin - Beverly Hills MI, US
Xidong Tang - Sterling Heights MI, US
Brian J. Koch - Berkley MI, US
Joseph M. Lograsso - Troy MI, US
Andrew J. Namou - Southfield MI, US
Rezina S. Nabi - Troy MI, US
Damon R. Frisch - Troy MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

G01N 27/416
H02J 7/14
H05K 7/14
G08B 21/00
B60W 10/24

US Classification:

324427, 320104, 320116, 320119, 320132, 320139, 324434, 324430, 307149, 3406361, 34063621, 180 6529, 1802073

Abstract:

A system and method for use with a vehicle battery pack having a number of individual battery cells, such as a lithium-ion battery commonly used in hybrid electric vehicles. In one embodiment, the method evaluates individual battery cells within a vehicle battery pack in order to obtain accurate estimates regarding their average transient voltage effect, open circuit voltage (OCV) and/or state of charge (SOC) so that a cell balancing process can be performed. These cell evaluations may be performed fairly soon after the vehicle is turned off and in a manner that utilizes a minimal amount of in-vehicle resources.

US Patent:

20110309838, Dec 22, 2011

Filed:

Jun 22, 2010

Appl. No.:

12/820648

Inventors:

Jian Lin - Beverly Hills MI, US
Xidong Tang - Sterling Heights MI, US
Brian J. Koch - Berkley MI, US
Joseph M. Lograsso - Troy MI, US
Damon R. Frisch - Troy MI, US
Rezina S. Nabi - Troy MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI

International Classification:

G01N 27/416

US Classification:

324427

Abstract:

A system and method for estimating internal parameters of a lithium-ion battery to provide a reliable battery state-of-charge estimate. The method uses a two RC-pair equivalent battery circuit model to estimate the battery parameters, including a battery open circuit voltage, an ohmic resistance, a double layer capacitance, a charge transfer resistance, a diffusion resistance and a diffusion capacitance. The method further uses the equivalent circuit model to provide a difference equation from which the battery parameters are adapted, and calculates the battery parameters from the difference equation.

US Patent:

20120101753, Apr 26, 2012

Filed:

Oct 20, 2010

Appl. No.:

12/908669

Inventors:

Jian Lin - Beverly Hills MI, US
Xidong Tang - Sterling Heights MI, US
Brian J. Koch - Berkley MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - DETROIT MI

International Classification:

G01R 31/36

US Classification:

702 63

Abstract:

A system and method for determining whether an onboard estimation process, such as a recursive least squares regression process, can effectively calculate the state-of-charge of a battery. The method includes defining a current sample time and a previous sample time and measuring the battery current. The method then calculates a variation moving average of the measured current and an index of current change rate determined by averaging the absolute value of the current variation moving average using the measured current and calculated moving averages from the previous sample time. The method then determines if the current change index is greater than a predetermined threshold, and if so, the estimate of the battery state-of-charge resulting from the onboard estimation process is valid.