Asif H Syed

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:

20120109556, May 3, 2012

Filed:

Feb 16, 2011

Appl. No.:

13/028860

Inventors:

Asif A. Syed - Canton MI, US
Brian J. Koch - Berkley MI, US
Sascha Schaefer - Selters, DE
Andreas Koenekamp - Darmstadt, DE

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - DETROIT MI

International Classification:

G01R 31/36

US Classification:

702 63

Abstract:

A method and system for selectively using a voltage-based state of charge estimate in an overall state of charge calculation. Regions or bands of battery pack state of charge are established, where in some regions, open circuit voltage is known to be a good indicator of state of charge, and in other regions, open circuit voltage is known to be a poor indicator of state of charge due to a high sensitivity to measurement error. In regions or bands where voltage-based state of charge is expected to be accurate, the voltage-based state of charge estimate may be used to scale or adjust a current-based state of charge estimate, thus avoiding a continuous accumulation of error in the current-based estimate. In regions or bands where voltage-based state of charge is known to be prone to error, only current-based state of charge information is used.

US Patent:

20120316810, Dec 13, 2012

Filed:

Jun 8, 2011

Appl. No.:

13/156259

Inventors:

Asif A. SYED - Canton MI, US
Sudhakar INGUVA - Troy MI, US
Joseph M. LOGRASSO - Troy MI, US
Christopher R. NEUMAN - Royal Oak MI, US
Ryan B. MOULLIET - Farmington Hills MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - DETROIT MI

International Classification:

G06F 19/00

US Classification:

702 63, 702 85

Abstract:

Methods and systems are provided for calibrating one or more limits of a battery of a vehicle, the battery having state of charge limits and power limits. A history of environmental conditions for the vehicle is obtained and stored in a memory. One or more of the state of charge limits, one or more of the power limits, or both are adjusted based on the history of environmental conditions and usage severity using a processor.