Patents by Inventor William R. Mayhew
William R. Mayhew has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9316309Abstract: A method of controlling shifts in a multi-speed transmission includes beginning an initial shift, which changes the transmission from a starting gear to an initial target gear, and executing an adjusted shift, which changes the transmission to an adjusted target gear having higher speed ratio than the initial target gear, when transition conditions are satisfied. The transition conditions include a threshold increase in torque request, which is sufficient to require the transmission to be placed into the adjusted target gear. The transition conditions also include a common controlling clutch, which is partially engaged during the initial shift and the adjusted shift and is an off-going clutch to place the transmission in the adjusted target gear. Executing the adjusted shift does not include placing the transmission in a neutral mode. Furthermore, executing the adjusted shift does not include completing the initial shift.Type: GrantFiled: December 15, 2014Date of Patent: April 19, 2016Assignee: GM Global Technology Operations LLCInventors: Harinath Atmaram, William R. Mayhew
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Patent number: 9056603Abstract: A system according to the principles of the present disclosure includes a downshift determination module and a speed control module. The downshift determination module determines when a closed-throttle downshift occurs. The closed-throttle downshift is a downshift of a transmission when a throttle valve of an engine is closed. The speed control module controls engine speed based on turbine speed during the closed-throttle downshift. The turbine speed is a speed of a turbine in a torque converter that couples the engine to the transmission.Type: GrantFiled: January 28, 2013Date of Patent: June 16, 2015Assignee: GM Global Technology Operations LLCInventors: Krishnendu Kar, Leon Cribbins, William R. Mayhew, Timothy J. Keenan
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Publication number: 20150096858Abstract: A method of controlling shifts in a multi-speed transmission includes beginning an initial shift, which changes the transmission from a starting gear to an initial target gear, and executing an adjusted shift, which changes the transmission to an adjusted target gear having higher speed ratio than the initial target gear, when transition conditions are satisfied. The transition conditions include a threshold increase in torque request, which is sufficient to require the transmission to be placed into the adjusted target gear. The transition conditions also include a common controlling clutch, which is partially engaged during the initial shift and the adjusted shift and is an off-going clutch to place the transmission in the adjusted target gear. Executing the adjusted shift does not include placing the transmission in a neutral mode. Furthermore, executing the adjusted shift does not include completing the initial shift.Type: ApplicationFiled: December 15, 2014Publication date: April 9, 2015Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Harinath Atmaram, William R. Mayhew
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Patent number: 8944957Abstract: A method of controlling shifts in a multi-speed transmission includes beginning an initial shift, which changes the transmission from a starting gear to an initial target gear, and executing an adjusted shift, which changes the transmission to an adjusted target gear having higher speed ratio than the initial target gear, when transition conditions are satisfied. The transition conditions include a threshold increase in torque request, which is sufficient to require the transmission to be placed into the adjusted target gear. The transition conditions also include a common controlling clutch, which is an off-going clutch to place the transmission in the adjusted target gear. Executing the adjusted shift does not include placing the transmission in a neutral mode. Furthermore, executing the adjusted shift does not include completing the initial shift.Type: GrantFiled: November 10, 2011Date of Patent: February 3, 2015Assignee: GM Global Technology Operations LLCInventors: Harinath Atmaram, William R. Mayhew
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Publication number: 20130297160Abstract: A system according to the principles of the present disclosure includes a downshift determination module and a speed control module. The downshift determination module determines when a closed-throttle downshift occurs. The closed-throttle downshift is a downshift of a transmission when a throttle valve of an engine is closed. The speed control module controls engine speed based on turbine speed during the closed-throttle downshift. The turbine speed is a speed of a turbine in a torque converter that couples the engine to the transmission.Type: ApplicationFiled: January 28, 2013Publication date: November 7, 2013Applicant: GM Global Technology Operations LLCInventors: Krishnendu Kar, Leon Cribbins, William R. Mayhew, Timothy J. Keenan
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Publication number: 20130118850Abstract: A method of controlling shifts in a multi-speed transmission includes beginning an initial shift, which changes the transmission from a starting gear to an initial target gear, and executing an adjusted shift, which changes the transmission to an adjusted target gear having higher speed ratio than the initial target gear, when transition conditions are satisfied. The transition conditions include a threshold increase in torque request, which is sufficient to require the transmission to be placed into the adjusted target gear. The transition conditions also include a common controlling clutch, which is an off-going clutch to place the transmission in the adjusted target gear. Executing the adjusted shift does not include placing the transmission in a neutral mode. Furthermore, executing the adjusted shift does not include completing the initial shift.Type: ApplicationFiled: November 10, 2011Publication date: May 16, 2013Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Harinath Atmaram, William R. Mayhew
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Patent number: 8365048Abstract: A control system includes an error calculation module that receives a data bit pattern having a predetermined quantity of data bits and that calculates a binary vector based on a predetermined binary matrix and the data bit pattern. The error calculation module further determines the data bit pattern contains a corrupted data bit when the binary vector is not a predetermined value. The control system further includes a bit position module that receives the binary vector, that locates the corrupted data bit based on the binary vector and that corrects the data bit pattern. The bit position module receives the data bit pattern when the binary number is the predetermined value. The data bits are pre-assigned a base-10 value that corresponds to a data bit position.Type: GrantFiled: September 25, 2007Date of Patent: January 29, 2013Inventor: William R. Mayhew
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Patent number: 8364436Abstract: A system includes a processing module, a sampling module, a period determination module, and a speed determination module. The processing module generates time stamps when pulses are received from a sensor that senses a rotation of a device. The sampling module samples the time stamps during N predetermined intervals and stores N of the time stamps that correspond to the N predetermined intervals, where N is an integer that is greater than 2. The period determination module determines a plurality of periods, wherein each one of the plurality of periods is based on a difference between two of the N time stamps. The speed determination module determines a rotational speed of the device based on a difference between two of the plurality of periods.Type: GrantFiled: October 21, 2009Date of Patent: January 29, 2013Inventor: William R. Mayhew
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Patent number: 8346444Abstract: A shift quality error detection system for an automatic transmission includes a vehicle acceleration determination module to determine a vehicle acceleration. An acceptance window module defines upper and lower limits of a desired vehicle acceleration. The shift quality error detection module compares the determined vehicle acceleration to the upper and lower limits of the desired vehicle acceleration. A shift quality error detection module selectively provides a shift quality error based on the comparison. A method of detecting shift quality error of an automatic transmission comprises determining a vehicle acceleration during a transmission gear shift. The method also includes comparing the vehicle acceleration to an acceptance window of desired vehicle accelerations and outputting an error signal based on the acceleration comparison.Type: GrantFiled: March 3, 2008Date of Patent: January 1, 2013Inventors: Haytham A. Fayyad, William R. Mayhew
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Patent number: 8328685Abstract: A method and control module for controlling a transmission of a vehicle includes a clutch torque load predictor module generating a predicted clutch torque load signal for the shift command and a minimum clutch pressure module generating a minimum clutch pressure signal corresponding to a minimum clutch pressure. The control module includes a pressure command module generating a commanded clutch pressure signal for the predicted clutch torque load signal based on the minimum clutch pressure signal and commanding operation of a clutch with a commanded clutch pressure signal. The control module also includes a transmission control module generating the shift command after the clutch torque load predictor module generates the predicted clutch signal, the minimum clutch pressure module generates the minimum clutch pressure signal and the pressure command module generates the commanded clutch pressure signal.Type: GrantFiled: September 25, 2009Date of Patent: December 11, 2012Inventors: William R. Mayhew, Haytham A. Fayyad, Stephen R. Tokish
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Patent number: 8234049Abstract: A control module includes a predicted torque control module that determines a desired throttle area based on a transmission torque request and a desired predicted torque. A throttle security module determines a throttle limit based on the desired throttle area and the desired predicted torque and determines an adjusted desired throttle area based on the throttle limit. A throttle actuator module adjusts a throttle based on the adjusted desired throttle area.Type: GrantFiled: January 30, 2009Date of Patent: July 31, 2012Inventors: Joseph M. Stempnik, Richard B. Jess, Bahram Younessi, Mark H. Costin, Michael L. Kociba, Paul A. Bauerle, Bryan D. Lehman, William R. Mayhew, Andrew W. Baur
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Publication number: 20110289390Abstract: A control system includes an error calculation module that receives a data bit pattern having a predetermined quantity of data bits and that calculates a binary vector based on a predetermined binary matrix and the data bit pattern. The error calculation module further determines the data bit pattern contains a corrupted data bit when the binary vector is not a predetermined value. The control system further includes a bit position module that receives the binary vector, that locates the corrupted data bit based on the binary vector and that corrects the data bit pattern. The bit position module receives the data bit pattern when the binary number is the predetermined value. The data bits are pre-assigned a base-10 value that corresponds to a data bit position.Type: ApplicationFiled: September 25, 2007Publication date: November 24, 2011Inventor: William R. Mayhew
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Patent number: 7979186Abstract: A torque converter clutch slip rate monitoring system includes a slip rate calculation module that receives a raw slip speed of a torque converter clutch and that calculates torque converter clutch slip acceleration based on the raw slip speed. A torque converter clutch slip rate monitoring module detects deviation of the slip acceleration from a predetermined range during a pulldown of the torque converter clutch.Type: GrantFiled: March 4, 2008Date of Patent: July 12, 2011Inventors: Haytham A. Fayyad, William R. Mayhew
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Patent number: 7933696Abstract: A vehicle diagnostic system is provided. The system includes: a first control module that includes a first processor and that controls a first vehicle subsystem; and second control module that controls a second vehicle subsystem and that validates the functionality of the first processor of the first control module wherein if the second control module determines that the first processor of the first control module is faulty, the second control module shuts down the first control module.Type: GrantFiled: June 6, 2007Date of Patent: April 26, 2011Inventors: William R. Mayhew, David W. Wright
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Publication number: 20110088468Abstract: A system includes a processing module, a sampling module, a period determination module, and a speed determination module. The processing module generates time stamps when pulses are received from a sensor that senses a rotation of a device. The sampling module samples the time stamps during N predetermined intervals and stores N of the time stamps that correspond to the N predetermined intervals, where N is an integer that is greater than 2. The period determination module determines a plurality of periods, wherein each one of the plurality of periods is based on a difference between two of the N time stamps. The speed determination module determines a rotational speed of the device based on a difference between two of the plurality of periods.Type: ApplicationFiled: October 21, 2009Publication date: April 21, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventor: William R. Mayhew
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Publication number: 20110077123Abstract: A method and control module for controlling a transmission of a vehicle includes a clutch torque load predictor module generating a predicted clutch torque load signal for the shift command and a minimum clutch pressure module generating a minimum clutch pressure signal corresponding to a minimum clutch pressure. The control module includes a pressure command module generating a commanded clutch pressure signal for the predicted clutch torque load signal based on the minimum clutch pressure signal and commanding operation of a clutch with a commanded clutch pressure signal. The control module also includes a transmission control module generating the shift command after the clutch torque load predictor module generates the predicted clutch signal, the minimum clutch pressure module generates the minimum clutch pressure signal and the pressure command module generates the commanded clutch pressure signal.Type: ApplicationFiled: September 25, 2009Publication date: March 31, 2011Applicant: GM GLOBAL TECHNOLOGY OEPERATIONS, INC.Inventors: William R. Mayhew, Haytham A. Fayyad, Stephen R. Tokish
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Publication number: 20090234545Abstract: A control module includes a predicted torque control module that determines a desired throttle area based on a transmission torque request and a desired predicted torque. A throttle security module determines a throttle limit based on the desired throttle area and the desired predicted torque and determines an adjusted desired throttle area based on the throttle limit. A throttle actuator module adjusts a throttle based on the adjusted desired throttle area.Type: ApplicationFiled: January 30, 2009Publication date: September 17, 2009Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Joseph M. Stempnik, Richard B. Jess, Bahram Younessi, Mark H. Costin, Michael L. Kociba, Paul A. Bauerle, Bryan D. Lehman, William R. Mayhew, Andrew W. Baur
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Publication number: 20090227422Abstract: A torque converter clutch slip rate monitoring system includes a slip rate calculation module that receives a raw slip speed of a torque converter clutch and that calculates torque converter clutch slip acceleration based on the raw slip speed. A torque converter clutch slip rate monitoring module detects deviation of the slip acceleration from a predetermined range during a pulldown of the torque converter clutch.Type: ApplicationFiled: March 4, 2008Publication date: September 10, 2009Inventors: Haytham A. Fayyad, William R. Mayhew
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Publication number: 20080300747Abstract: A shift quality error detection system for an automatic transmission includes a vehicle acceleration determination module to determine a vehicle acceleration. An acceptance window module defines upper and lower limits of a desired vehicle acceleration. The shift quality error detection module compares the determined vehicle acceleration to the upper and lower limits of the desired vehicle acceleration. A shift quality error detection module selectively provides a shift quality error based on the comparison. A method of detecting shift quality error of an automatic transmission comprises determining a vehicle acceleration during a transmission gear shift. The method also includes comparing the vehicle acceleration to an acceptance window of desired vehicle accelerations and outputting an error signal based on the acceleration comparison.Type: ApplicationFiled: March 3, 2008Publication date: December 4, 2008Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Haytham A. Fayyad, William R. Mayhew
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Publication number: 20080059016Abstract: A vehicle diagnostic system is provided. The system includes: a first control module that includes a first processor and that controls a first vehicle subsystem; and second control module that controls a second vehicle subsystem and that validates the functionality of the first processor of the first control module wherein if the second control module determines that the first processor of the first control module is faulty, the second control module shuts down the first control module.Type: ApplicationFiled: June 6, 2007Publication date: March 6, 2008Inventors: William R. Mayhew, David W. Wright