Patents by Inventor Madhusudan Raghavan
Madhusudan Raghavan 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: 7976424Abstract: An automatic transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may be either clutches or brakes.Type: GrantFiled: March 11, 2008Date of Patent: July 12, 2011Assignee: GM Global Technology Operations LLCInventors: Andrew W. Phillips, James M. Hart, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
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Publication number: 20110160018Abstract: An automatic transmission includes an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may be either clutches or brakes.Type: ApplicationFiled: March 9, 2011Publication date: June 30, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, LLCInventors: James M. Hart, Andrew W. Phillips, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7967715Abstract: A transmission is disclosed having an input member, an output member, a plurality of planetary gear sets, a plurality of interconnecting members and a plurality of torque-transmitting mechanisms. The plurality of planetary gear sets has first, second and third members. The input member is continuously interconnected with a member of the planetary gear sets. The output member is continuously interconnected with another member of the planetary gear sets. At least eight forward speeds and one reverse speed are produced by the selective engagement of the five torque-transmitting mechanisms.Type: GrantFiled: March 1, 2010Date of Patent: June 28, 2011Assignee: GM Global Technology Operations LLCInventors: James M. Hart, James B. Borgerson, Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7951039Abstract: An automatic transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and brakes.Type: GrantFiled: March 10, 2008Date of Patent: May 31, 2011Assignee: GM Global Technology Operations LLCInventors: James M. Hart, Andrew W. Phillips, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7946949Abstract: A transmission is disclosed having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and brakes.Type: GrantFiled: October 23, 2008Date of Patent: May 24, 2011Assignee: GM Global Technology Operations LLCInventors: James M. Hart, Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7946950Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets, six torque-transmitting devices, two fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and the transmission housing, and are operated in combinations of two to establish eight forward speed ratios and one reverse speed ratio.Type: GrantFiled: August 1, 2007Date of Patent: May 24, 2011Assignee: GM Global Technology Operations LLCInventors: Clinton E. Carey, Andrew W. Phillips, Scott H. Wittkopp, James M. Hart, Madhusudan Raghavan
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Publication number: 20110105268Abstract: An automatic transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may be either clutches or brakes.Type: ApplicationFiled: January 10, 2011Publication date: May 5, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Andrew W. Phillips, Scott H. Wittkopp, James M. Hart, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7927248Abstract: An automatic transmission includes an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may be either clutches or brakes.Type: GrantFiled: March 17, 2008Date of Patent: April 19, 2011Assignee: GM Global Technology Operations LLCInventors: James M. Hart, Andrew W. Phillips, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
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Publication number: 20110045931Abstract: A hybrid transmission is configured to transfer mechanical power to an output member and includes an input member, an output member, and a transmission case circumscribing first and second differential gear sets, each differential gear set including a plurality of meshingly engaged rotatable elements. The first differential gear set is configured with four nodes for transferring mechanical power, and the second differential gear set is configured with three nodes for transferring mechanical power. Two of the four nodes of the first differential gear set are continuously interconnected to two of the three nodes of the second differential gear set. A first torque transfer clutch is configured to selectively connect the input member to an internal combustion engine. First and second brake devices are configured to selectively interconnect elements of the first and second differential gear sets, the transmission case, the input member, and the output member.Type: ApplicationFiled: August 20, 2009Publication date: February 24, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Madhusudan Raghavan, Alan G. Holmes
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Patent number: 7887457Abstract: A transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and brakes.Type: GrantFiled: December 12, 2007Date of Patent: February 15, 2011Assignee: GM Global Technology Operations LLCInventors: Scott H. Wittkopp, Andrew W. Phillips, James M. Hart, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7883441Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets having six torque-transmitting devices, two fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is selectively connected to at least one of the planetary gear members, and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, the transmission housing and with the input member, and are operated in combinations to establish at least eight forward speed ratios and at least one reverse speed ratio.Type: GrantFiled: October 11, 2007Date of Patent: February 8, 2011Assignee: GM Global Technology Operations LLCInventors: James M. Hart, Scott H. Wittkopp, Clinton E. Carey, Andrew W. Phillips, Madhusudan Raghavan
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Patent number: 7871352Abstract: An automatic transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may be either clutches or brakes.Type: GrantFiled: March 14, 2008Date of Patent: January 18, 2011Assignee: GM Global Technology Operations LLCInventors: Andrew W. Phillips, Scott H. Wittkopp, James M. Hart, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7862468Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets having five torque-transmitting mechanisms, three fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The five torque-transmitting mechanisms provide interconnections between various gear members, and the transmission housing, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.Type: GrantFiled: October 11, 2007Date of Patent: January 4, 2011Assignee: GM Global Technology Operations, Inc.Inventors: Andrew W. Phillips, Scott H. Wittkopp, James M. Hart, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7854679Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets having six torque-transmitting devices and three fixed interconnections. The powertrain includes an engine and torque converter that is selectively connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, the transmission housing and with the input member, and are operated in combinations of three to establish eight forward speed ratios and one reverse speed ratio.Type: GrantFiled: October 11, 2007Date of Patent: December 21, 2010Assignee: GM Global Technology Operations, Inc.Inventors: James M. Hart, Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7828689Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets, six torque-transmitting devices, a split sun gear, two fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and the transmission housing, and are operated in combinations of two to establish eight forward speed ratios and one reverse speed ratio.Type: GrantFiled: August 24, 2007Date of Patent: November 9, 2010Assignee: GM Global Technology Operations, Inc.Inventors: Andrew W. Phillips, Scott H. Wittkopp, James M. Hart, Clinton E. Carey, Madhusudan Raghavan
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Publication number: 20100280687Abstract: A method of controlling a vehicle powertrain and a corresponding vehicle control system are provided that enable operation in an electric-only operating mode for an extended range by adjusting the threshold minimum state of charge of the battery, i.e., the state of charge of the battery at which the engine will be started to allow the battery charge to be replenished, in accordance with vehicle location. The engine will also be started when the vehicle is within a predetermined distance of a long-term parking location.Type: ApplicationFiled: April 30, 2009Publication date: November 4, 2010Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Edward D. Tate, JR., Charles A. Massoll, Anthony L. Posawatz, John R. Ferris, Madhusudan Raghavan, Damon R. Frisch, Partha P. Goswami
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Patent number: 7824298Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets having six torque-transmitting mechanisms and two fixed interconnections. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, and with the transmission housing, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.Type: GrantFiled: October 23, 2007Date of Patent: November 2, 2010Assignee: GM Global Technology Operations, Inc.Inventors: James M. Hart, Andrew W. Phillips, Clinton E. Carey, Scott H. Wittkopp, Madhusudan Raghavan
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Patent number: 7824299Abstract: A transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and brakes.Type: GrantFiled: December 12, 2007Date of Patent: November 2, 2010Assignee: GM Global Technology Operations, Inc.Inventors: James M. Hart, Scott H. Wittkopp, Clinton E. Carey, Andrew W. Phillips, Madhusudan Raghavan
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Patent number: 7815541Abstract: A transmission is provided having an input member, an output member, four planetary gear sets, a plurality of interconnecting members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. A first interconnecting member continuously interconnects the third member of the first planetary gear set with the third member of the third planetary gear set. A second interconnecting member continuously interconnects the second member of the first planetary gear set with the third member of the second planetary gear set. A third interconnecting member continuously interconnects the first member of the second planetary gear set with the first member of the third planetary gear set. A fourth interconnecting member continuously interconnects the second member of the third planetary gear set with a third member of the fourth planetary gear set. The torque transmitting devices may include clutches and brakes.Type: GrantFiled: August 1, 2007Date of Patent: October 19, 2010Assignee: GM Global Technology Operations, Inc.Inventors: Andrew W. Phillips, Scott H. Wittkopp, James M. Hart, Clinton E. Carey, Madhusudan Raghavan
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Patent number: 7811195Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets having five torque-transmitting mechanisms, two fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The five torque-transmitting mechanisms provide interconnections between various gear members and are operated in combinations to establish eight forward speed ratios and one reverse speed ratio.Type: GrantFiled: October 23, 2007Date of Patent: October 12, 2010Assignee: GM Global Technology Operations, Inc.Inventors: Andrew W. Phillips, James M. Hart, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan