Li F Chen

US Patent:

6366049, Apr 2, 2002

Filed:

May 10, 2000

Appl. No.:

09/567592

Inventors:

Li Chen - Livonia MI
Richard Joseph Hampo - Livonia MI
Yifan Zhao - Bellevile MI

Assignee:

Ecostar Electric Drive Systems L.L.C. - Dearborn MI

International Classification:

H02P 528

US Classification:

318799, 318432, 318433, 318434, 318727, 318609, 318610, 318800, 318801

Abstract:

A speed controller circuit for a motor including a ramp function generator having a first input connected to a source of a speed demand signal and a second input connected to a ramp step signal. The ramp function generator develops a frequency ramp that has a slope is initiated by the speed demand signal which is adjusted in response to the ramp step signal. The ramp function generator also provides a frequency signal wherein the ramp function increases or decreases the frequency according to the speed demand. A V/F circuit to the ramp function generator and a space vector modulation circuit are connected to the V/F circuit. The output of the space vector modulation circuit is applied through power switching devices to the motor for speed control. A PI controller circuit is connected to a motor current feedback signal and to a maximum current signal, which provides the current limit of the control system. The output signal from the PI controller circuit is a ramp step signal used to adjust the ramp signal of the ramp function generator to provide to provide the best performance of the motor control system and achieve a better starting time for the motor.

US Patent:

6377019, Apr 23, 2002

Filed:

Feb 10, 2000

Appl. No.:

09/499366

Inventors:

Li Chen - Livonia MI

Assignee:

Ford Global Technologies, Inc. - Dearborn MI

International Classification:

H02P 7628

US Classification:

318807, 318803, 318805, 318808, 318809, 318798

Abstract:

An induction motor control system ( ) for electric vehicles having a DC power supply ( ), an inverter ( ), an induction motor ( ), a motor controller ( ) and a vehicle-level controller ( ). The method and system of the present invention optimizes the torque output for the induction motor and utilizes minimum power. The method and system of the present invention calculates the flux current such that the slip frequency is maintained at a nominal level, thereby producing peak torque.

US Patent:

6388419, May 14, 2002

Filed:

Sep 1, 2000

Appl. No.:

09/653654

Inventors:

Li Chen - Livonia MI
Xingyi Xu - Canton MI
Richard Joseph Hampo - Livonia MI
Kerry Eden Grand - Chesterfield MI

Assignee:

Ford Global technologies, Inc. - Dearborn MI

International Classification:

H02P 124

US Classification:

318727, 318138, 318254, 318800, 318801, 318802, 318803, 318804, 318805, 318806, 318807, 318808

Abstract:

A motor control system for use within an electric vehicle having an induction motor Control system utilizes a torque control module a vector control module and a space vector PWM module to efficiently and accurately control the torque provided by motor.

US Patent:

6445734, Sep 3, 2002

Filed:

Jun 30, 1999

Appl. No.:

09/343873

Inventors:

Li Chen - Irvine CA
Farhad Aminian - Irvine CA
Keith T. Chu - Laguna Niguel CA

Assignee:

Conexant Systems, Inc. - Newport Beach CA

International Classification:

H03H 730

US Classification:

375231, 375232, 375350, 708305, 708323

Abstract:

Equalizer training is validated by techniques to detect false training. The validation techniques involve checking the unique time domain energy shaping of a plurality of taps of a trained equalizer of a modem for good training. The energy measure for each equalizer tap of the plurality of taps is approximated by summing the magnitude of a real component and a magnitude of an imaginary component of an equalizer coefficient corresponding to the equalizer tap. A tap with a highest approximate energy (i. e. , the main tap) is then determined. Next, the main tap energy is compared to a main tap threshold and a predetermined guarding threshold. The plurality of taps are arranged in a time index ordered sequence. In determining the main tap threshold, a first energy sum of a beginning set of taps in the sequence is compared with a second energy sum of a last set of taps in the sequence. The lesser tap energy sum between the first energy sum and the second energy sum is the main tap threshold.

US Patent:

6455550, Sep 24, 2002

Filed:

Aug 21, 1998

Appl. No.:

09/138353

Inventors:

Li Chen - Westfield NJ
Robert William Guthrie - Saddle Brook NJ
Jefferson Wright Tilley - North Caldwell NJ
Kenneth Gregory Hull - Cambridge MA

Assignee:

Hoffmann-La Roche Inc. - Nutley NJ

International Classification:

A61K 314166

US Classification:

514341, 514386, 5462744, 5483225, 5483255

Abstract:

Compounds of the formula: are disclosed which have activity as inhibitors of binding between VCAM-1 and cells expressing VLA-4. Such compounds are useful for treating diseases whose symptoms and/or damage are related to the binding of VCAM-1 to cells expressing VLA-4.

US Patent:

6600015, Jul 29, 2003

Filed:

Mar 19, 2001

Appl. No.:

09/811964

Inventors:

Li Chen - Westfield NJ
Adrian Wai-Hing Cheung - Glen Rock NJ
Waleed Danho - Wayne NJ
Joseph Swistok - Nutley NJ
Keith Alan Yagaloff - HoHokus NJ

Assignee:

Hoffmann-La Roche Inc. - Nutley NJ

International Classification:

C07K 508

US Classification:

530331, 530330, 514 18

Abstract:

Peptides that selectively stimulate melanocortin-4 (MC-4) receptor activity are disclosed. In one embodiment, the peptides are of formula I:.

US Patent:

6630809, Oct 7, 2003

Filed:

Nov 29, 2001

Appl. No.:

09/683180

Inventors:

Li Chen - Livonia MI
Xingyi Xu - Canton MI
Vinod Reddy - Ocala FL
Richard Joseph Hampo - Plymouth MI
Kerry Eden Grand - Chesterfield MI

Assignee:

Ballard Power Systems Corporation - Dearborn MI

International Classification:

H02P 764

US Classification:

318804, 318800, 318801

Abstract:

Field oriented induction motor system including a field oriented induction motor having an associated torque current and an associated flux current and a predetermined current ratio, wherein the predetermined current ratio is defined as the ratio of the torque current to the flux current, and wherein the predetermined current ratio is dependent upon the saturation state of the motor. A method for selecting the ratio of torque current to flux current for a field oriented induction motor including applying an allocation factor to the torque current and flux current, wherein the allocation factor is dependent upon the saturation state of the motor. The saturation state of the motor is determined based upon motor parameters.

US Patent:

6707270, Mar 16, 2004

Filed:

Nov 13, 2001

Appl. No.:

10/010307

Inventors:

Li Chen - Livonia MI
Kerry Eden Grand - Chesterfield MI
Richard Joseph Hampo - Plymouth MI
Vinod Reddy - Ocala FL
Xingyi Xu - Canton MI
Nick Langovsky - Inkster MI

Assignee:

Ballard Power Systems Corporation - Dearborn MI

International Classification:

H02P 736

US Classification:

318798, 318806, 318808

Abstract:

System and method for enhancing the torque output of a field oriented induction motor including a controller having a plurality of predetermined control parameters operable for processing input signals to generate output signals. The plurality of predetermined control parameters are dependent upon the nature of the input signals and the operational state of the motor. A sensor system is operable for communicating feedback signals related to the output signals and the operational state of the motor from the motor to the controller.