Venkatapathi R Nallapa from 7006 Carlyle Xing, West Bloomfield, MI 48322, Phone: 248 592-9775

Eeprom Emulation In Flash Memory
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US Patent:

7058755, Jun 6, 2006
Filed:

Sep 9, 2003
Appl. No.:

10/658124
Inventors:

Venkatapathi R. Nallapa - West Bloomfield MI, US
Assignee:

Ballard Power Systems Corporation - Dearborn MI
International Classification:

G06F 12/00
US Classification:

711103, 711100, 711154, 711220
Abstract:

An efficient emulation of EEPROM employing flash memory employs a fixed location for an address pointer in flash memory and such that an erase operation is required only once every nth update where n is the number of bits at the fixed location, thus avoiding the need to erase the sector on every update and avoiding delays associated with linked lists for determining the address of the most up-to-date information. Use of bit shifting provides fast determination of the desired address.

Method, Apparatus And Article For Motor Control Voltage Dropout Detection
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US Patent:

7084588, Aug 1, 2006
Filed:

Jul 30, 2004
Appl. No.:

10/903918
Inventors:

Richard J. Hampo - Plymouth MI, US
Venkatapathi R. Nallapa - West Bloomfield MI, US
Christophe Soudier - Ann Arbor MI, US
Assignee:

Ballard Power Systems Corporation - Dearborn MI
International Classification:

H02P 1/04
US Classification:

318139, 318484, 388903, 388909
Abstract:

A control subsystem for an electric motor determines whether power was interrupted, and delays torque production if power was interrupted. The control subsystem may employ two separate non-volatile memory locations, or alternatively a single non-volatile memory location.

Encoder Failure Detection
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US Patent:

7178412, Feb 20, 2007
Filed:

Jul 30, 2004
Appl. No.:

10/903492
Inventors:

Venkatapathi Raju Nallapa - West Bloomfield MI, US
Assignee:

Ballard Power Systems Corporation - Dearborn MI
International Classification:

G01L 3/02
US Classification:

73862326
Abstract:

An encoder failure detector system and method for detecting failure of an encoder at near-zero rotational speeds. For example, in one embodiment a failure is indicated if a torque command exceeds a selected threshold for a selected period of time and no movement of a rotor is detected during the selected period of time.

Method, Apparatus And Article For Load Stabilization
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US Patent:

7348750, Mar 25, 2008
Filed:

Dec 3, 2004
Appl. No.:

11/003143
Inventors:

Richard J. Hampo - Plymouth MI, US
Venkatapathi R. Nallapa - West Bloomfield MI, US
Franz Prenner - Sindelfingen, DE
Assignee:

Continential Automotive Systems US, Inc. - Auburn Hills MI
International Classification:

G05B 5/01
US Classification:

318623
Abstract:

A system, method, and article for protecting a power source for a machine from sudden changes in load. In one embodiment, energy is wasted in a winding of a motor in response to a decrease in a load presented to the power source.

Controller Method, Apparatus And Article Suitable For Electric Drive
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US Patent:

7426099, Sep 16, 2008
Filed:

Jun 29, 2006
Appl. No.:

11/480311
Inventors:

Christophe Soudier - Ypsilanti MI, US
Bing Cheng - West Bloomfield MI, US
Steven J. Kowalec - Plymouth MI, US
Venkatapathi R. Nallapa - West Bloomfield MI, US
Richard J. Hampo - Plymouth MI, US
Assignee:

Continental Automotive Systems US, Inc. - Auburn Hills
International Classification:

H02H 7/08
US Classification:

361 23, 361 18, 701 29, 701 33, 701 41, 340 651
Abstract:

A control system, method and article allows a monitoring module to monitor operation of a main controller in an electric drive, by providing questions and evaluating the accuracy and/or timeliness of responses from the main controller. Upon detection of an excessive number of incorrect or late responses, the monitoring module can shutdown operation, and may provide an alternative communications path, thereby preventing corrupt data from reaching a vehicle network, while providing communications for diagnostic and recovery such as by provision of new software or firmware instructions. The main controller may monitor the operation of the monitoring module, taking appropriate action if a fault is detected. Disabling a supply of power to a traction motor may be based on current operating conditions, such as speed.

Method, Apparatus And Article For Load Stabilization
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US Patent:

7456598, Nov 25, 2008
Filed:

Jan 31, 2008
Appl. No.:

12/023446
Inventors:

Richard J. Hampo - Plymouth MI, US
Venkatapathi R. Nallapa - West Bloomfield MI, US
Franz Prenner - Sindelfingen DE, US
Assignee:

Continental Automotive Systems US. Inc. - Auburn Hills
International Classification:

G05B 5/01
US Classification:

318623, 318609, 318610, 31840015
Abstract:

A system, method, and article for protecting a power source for a machine from sudden changes in load. In one embodiment, energy is wasted in a winding of a motor in response to a decrease in a load presented to the power source.

Method And Apparatus For Cooling System Failure Detection
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US Patent:

7484377, Feb 3, 2009
Filed:

Dec 3, 2004
Appl. No.:

11/003146
Inventors:

Venkatapathi Raju Nallapa - West Bloomfield MI, US
Assignee:

Continental Automotive Systems US, Inc. - Auburn Hills
International Classification:

F25B 49/00
G05D 23/32
F25D 23/12
US Classification:

62127, 62129, 62158, 622592, 361688
Abstract:

A system and method for detecting failure of a cooling system in an alternating current machine, such as a motor and/or a generator. For example, in one embodiment energy wasting is initiated and a failure is indicated if a temperature rises by more than a selected amount over a selected time period.

Method, Apparatus And Article For Vibration Compensation In Electric Drivetrains
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US Patent:

7495403, Feb 24, 2009
Filed:

Mar 30, 2005
Appl. No.:

11/095035
Inventors:

Christophe Soudier - Ypsilanti MI, US
Richard J. Hampo - Plymouth MI, US
Vinod Reddy - Novi MI, US
Venkatapathi R. Nallapa - West Bloomfield MI, US
Assignee:

Continental Automotive Systems US, Inc. - Auburn Hills
International Classification:

H02P 7/00
US Classification:

318432, 318632
Abstract:

A torque current peak compensation value is subtracted from a torque current reference value, where the torque current peak compensation value is based at least in part on a determined peak of vibration. A torque current compensation value is subtracted from the results to produce an adjusted torque current reference value.

Venkatapathi R Nallapa