Vivek Mehta

US Patent:

6655201, Dec 2, 2003

Filed:

Sep 13, 2001

Appl. No.:

09/951586

Inventors:

Christian G Masson - Puteaux, FR
Steven D Stiles - Clarkston MI
Vivek Mehta - Bloomfield Hills MI
Richard B Jess - Haslett MI
Michael S Emmorey - Brighton MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

G01M 1500

US Classification:

731182

Abstract:

A method and apparatus for determining the mass air flow into an internal combustion engine without the use of a mass air flow sensor. Speed density and throttle position methods of estimating mass air flow are combined using a first Kalman filter. In one aspect of the invention, the input throttle position into the throttle position mass air flow estimate is the measured throttle position obtained from the throttle position sensor. In another aspect of the invention, the input throttle position into the throttle position mass air flow estimate is the output of a second Kalman filter, which uses as its inputs the measured throttle position obtained from the throttle position sensor and the desired throttle position obtained from the pedal position sensor.

US Patent:

6808471, Oct 26, 2004

Filed:

May 8, 2003

Appl. No.:

10/431698

Inventors:

Paul A. Bauerle - Fenton MI
Mark H. Costin - Bloomfield Township MI
Donovan L. Dibble - Utica MI
Kerfegar K. Katrak - Fenton MI
Vivek Mehta - Bloomfield Hills MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

B60K 4104

US Classification:

477107, 123481

Abstract:

Methods and apparatus are provided for ensuring that a throttle increase accompanying a change in the number of active cylinders of an internal combustion engine will not occur too long with more than a selected fraction of all the cylinders activated, so as to not startle a driver. The apparatus comprises an electronic controller that generates the throttle increase if less than all the cylinders are requested to be activated. A determination is made as to whether the number of cylinders being fueled is equal to or less than the selected fraction. A timer is started if the number of cylinders being fueled is greater than the selected fraction. The throttle increase is turned off if the amount of time measured by the timer exceeds a threshold before the number of cylinders being fueled becomes either less than or equal to the selected fraction.

US Patent:

7002352, Feb 21, 2006

Filed:

Jun 24, 2003

Appl. No.:

10/602912

Inventors:

Bruce A. Rogers - Novi MI, US
Paul A. Bauerle - Fenton MI, US
Vivek Mehta - Bloomfield Hills MI, US
Cheryl A. Williams - Ann Arbor MI, US

Assignee:

General Motors Corporation - Detroit MI

International Classification:

G01R 31/08

US Classification:

324522, 324 72, 340661

Abstract:

A diagnostic apparatus is suitable for use in an automobile controller and includes a power supply terminal conducting a reference voltage, a sampling circuit and a reference voltage diagnostic circuit. The sampling circuit is coupled to the power supply terminal and has an output terminal for providing sampled values of the reference voltage. The reference voltage diagnostic circuit has an input terminal coupled to the output terminal of the sampling circuit. The reference voltage diagnostic circuit maintains a historical value of the reference voltage over a predetermined time period, compares a current sampled value of the reference voltage to the historical value, and indicates a fault in the reference voltage in response to the current sampled value being different from the historical value by more than a predetermined threshold.

US Patent:

7051517, May 30, 2006

Filed:

Jul 24, 2003

Appl. No.:

10/626003

Inventors:

Vivek Mehta - Bloomfield Hills MI, US
Joseph M. Stempnik - Warren MI, US
Donovan L. Dibble - Utica MI, US
Paul A. Bauerle - Fenton MI, US

Assignee:

General Motors Corporation - Detroit MI

International Classification:

F01N 3/00

US Classification:

60285, 60274, 60277, 60284

Abstract:

A controller estimates a temperature of a catalytic converter in a vehicle and determines an engine speed. The controller shuts off fuel to the engine if the estimated temperature is greater than a maximum temperature of the catalytic converter and the engine speed is greater than a maximum engine speed. If the estimated catalytic converter temperature is greater than the maximum temperature, the controller delays a spark retard request to the engine. The controller updates vehicle torque with an integral torque if an RPM error is within an RPM error range and vehicle speed is less than a maximum vehicle speed for a first period. The controller increases torque to the engine by a proportional torque if an RPM error is within an RPM error range to prevent engine stall. The controller updates the integral torque when the RPM error is within an RPM error range for a first period.

US Patent:

7509845, Mar 31, 2009

Filed:

Feb 12, 2007

Appl. No.:

11/673837

Inventors:

Layne K. Wiggins - Plymouth MI, US
Vivek Mehta - Bloomfield Hills MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

G01M 15/00

US Classification:

7311431

Abstract:

A system for detecting contamination of an air filter for an internal combustion engine includes an air pressure sensor disposed downstream of the air filter, an air flow sensor disposed in an air intake system of the engine, and a control module in communication with the air pressure sensor and the air flow sensor. The control module is configured to estimate an atmospheric pressure based on a signal received from the air pressure sensor. The control module is further configured to determine a contamination level of the air filter based on an air flow rate provided by the air flow sensor and a pressure drop across the air filter based on a pressure difference between the estimated atmospheric pressure and a second pressure measurement from the air pressure sensor that corresponds to the provided air flow rate.

US Patent:

7593806, Sep 22, 2009

Filed:

Jul 29, 2008

Appl. No.:

12/181410

Inventors:

Christopher E. Whitney - Highland MI, US
Louis A. Avallone - Milford MI, US
Timothy J. Hartrey - Brighton MI, US
Mark D. Carr - Fenton MI, US
Vivek Mehta - Bloomfield Hills MI, US
Bahram Younessi - Farmington MI, US

International Classification:

F02D 41/00

US Classification:

701104

Abstract:

A control system for a vehicle includes a first counter that indicates a first count of a number of cylinders of an engine of the vehicle that are fueled. A second counter indicates a second count of the number of cylinders that are fueled. A control module determines a secure count based on the first count and the second count. The control module adjusts torque output of the engine based on the secure count.

US Patent:

8027780, Sep 27, 2011

Filed:

May 1, 2009

Appl. No.:

12/434127

Inventors:

Christopher E. Whitney - Highland MI, US
Todd R. Shupe - Milford MI, US
Vivek Mehta - Bloomfield Hills MI, US
Kristian Keary - Troy MI, US
Richard B. Jess - Haslett MI, US

International Classification:

G06F 19/00
G06F 19/24

US Classification:

701110, 123436

Abstract:

A method and control module for controlling an engine includes a requested torque module that generates a requested torque and a maximum toque capacity module that determines a maximum torque capacity corresponding to a maximum torque capacity of the engine. A launch trim torque threshold determination module determines a launch trim torque threshold. A comparison module that compares the requested torque and the launch trim torque threshold. An output module that applies a fast rate limit to the requested torque up to the launch trim threshold when the requested torque is less than the launch trim torque threshold and a shower rate limited torque request when the requested torque is greater than the launch trim torque threshold.

US Patent:

8181627, May 22, 2012

Filed:

Feb 9, 2009

Appl. No.:

12/367886

Inventors:

Kevin T. Sharples - Pinkney MI, US
Mark H. Costin - Bloomfield Township MI, US
Timothy J. Hartrey - Brighton MI, US
Christopher E. Whitney - Highland MI, US
Bahram Younessi - Farmington MI, US
Weixin Yan - Novi MI, US
Jeffrey M. Kaiser - Highland MI, US
Richard B. Jess - Haslett MI, US
Joseph M. Stempnik - Warren MI, US
John A. Jacobs - Fenton MI, US
Jinchun Peng - Westland MI, US
Leonard G. Wozniak - Ann Arbor MI, US
Vivek Mehta - Bloomfield Hills MI, US
Bruce A. Rogers - Novi MI, US

International Classification:

F02D 41/00
B60K 31/00

US Classification:

123319, 123361, 180177

Abstract:

An engine system includes a throttle actuator module and a torque control module. The throttle actuator module controls a throttle actuator based on a desired throttle area. The torque control module determines an actuator torque. The torque control module determines a rate limited torque, a maximum torque, and a minimum torque based on the actuator torque and a predetermined rate of change. The torque control module determines the desired throttle area based on the actuator torque when the rate limited torque is greater than the maximum torque. The torque control module determines the desired throttle area based on the actuator torque when the rate limited torque is less than the minimum torque.