1
Raymond J Haka: Multi-speed transmission. General Motors Corporation, Christopher DeVries, March 14, 2006: US07011597 (183 worldwide citation)

A planetary transmission includes four planetary gearsets, two of which are simple planetary gearsets and two of which are compound planetary gearsets. A first of the planetary gearsets has members selectively connectible with a ground or stationary member through a synchronizer clutch. A second, th ...


2
Donald Klemen: Eight-speed transmissions with four planetary gear sets. General Motors Corporation, Christopher DeVries, January 16, 2007: US07163484 (157 worldwide citation)

Eight-speed transmissions are provided that include four planetary gear sets having seven torque-transmitting mechanisms and various fixed interconnections to provide eight forward speed ratios and at least one reverse speed ratio. The powertrain includes an engine and torque converter that is conti ...


3
Anthony H Heap: Control system for hybrid powertrain. GM Global Technology Operations, Christopher DeVries, December 26, 2006: US07154236 (156 worldwide citation)

A method and apparatus for determining a preferred operating range for a plurality of torque-generative devices is provided. Each device is operable to provide motive torque to a transmission. The invention includes defining a first and a second operating range in a first operating space. The first ...


4
Nick S Kapsokavathis, David W Walters, Marvin E Carpenter: Battery voltage reduction. General Motors Corporation, Christopher DeVries, August 30, 2005: US06936995 (97 worldwide citation)

A regulator voltage control includes measuring a current of a battery, determining a state of charge (SOC) of the battery based on the current, and determining a nominal optimum charging voltage as a function of the SOC of the battery. The nominal optimum charging voltage is converted to a % duty cy ...


5
Edward Dean Tate Jr, Mark William Verbrugge, Shawn D Sarbacker: State of charge prediction method and apparatus for a battery. General Motors Corporation, Christopher DeVries, August 27, 2002: US06441586 (92 worldwide citation)

A method of determining the state of a battery including the steps of generating a state vector that describes the state of the battery, predicting a response for the state vector, measuring a response of the battery, and correcting the state vector based on the differences between the predicted res ...


6
Aleksander Boguslaw Hac, Melinda Daniele Simpson: Active brake control including estimation of yaw rate and slip angle. General Motors Corporation, Delphi Technologies, Christopher DeVries, December 19, 2000: US06161905 (82 worldwide citation)

An improved vehicle active brake control based on an estimate of vehicle yaw rate and slip angle, wherein the estimate is based on a weighted average of two yaw rate values developed with two different estimation techniques. In general, the first estimate of yaw rate is based on the relative velocit ...


7
Scott D Downer, James F Lazar, James M Nagashima: Electrical motor power management system. General Motors Corporation, Christopher DeVries, August 19, 2003: US06608396 (80 worldwide citation)

A power control system for an electric traction motor in a vehicle comprising at least one inverter for providing conditioned electrical power to the electric traction motor, a plurality of power stages for providing DC power to the at least one inverter, each stage including a battery and boost/buc ...


8
Goro Tamai, William Leonard Aldrich III: System for battery module balancing via variable voltage DC-DC converter in a hybrid-electric powertrain. General Motors Corporation, Christopher DeVries, August 14, 2001: US06275004 (78 worldwide citation)

An apparatus for balancing a battery module in a vehicle including a plurality of batteries in the battery module, the plurality of batteries connected in series, the plurality of batteries each having a battery voltage, and at least one battery providing power to an electrical system of the vehicle ...


9
Michael Livshiz, Joseph Robert Dulzo, Onassis Matthews, Donovan L Dibble, Alfred E Spitza Jr, Scott Joseph Chynoweth: Torque estimator for engine RPM and torque control. General Motors Corporation, Christopher DeVries, March 9, 2004: US06704638 (76 worldwide citation)

An engine toque estimator according to the invention includes a vehicle data bus that provides a plurality of engine operating inputs including at least one of engine RPM, spark and a dilution estimate. A steady state torque estimator communicates with the vehicle data bus and generates a steady sta ...


10
Paul D Stevenson: Seven-speed transmission. General Motors Corporation, Christopher DeVries, March 21, 2006: US07014589 (66 worldwide citation)

A seven-speed transmission includes an input shaft, an output shaft, and a planetary gear arrangement having first, second, third and fourth planetary gear sets, each planetary gear set having first, second and third members. First and second interconnecting members continuously interconnect members ...