Patents by Inventor Bryan M. Ludwig
Bryan M. Ludwig 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).
-
Host system with AC charging inlet and method for identifying an electrical device connected thereto
Patent number: 11548402Abstract: A controller of a host system executes a method for detecting an external AC electrical device. While an AC charging inlet of the host system is electrically connected to the device via different vehicle-to-live (V2L) and jump-charge connections, the controller detects a control pilot voltage and a proximity voltage. When the control pilot voltage is 0V, the controller determines whether entry conditions are satisfied indicative of a desire to offload power from the host system to the device. When the entry conditions are satisfied, the proximity or control pilot voltage are modulated to generate a modulated voltage signal, which the controller compares to an expected voltage indicative of the device. Power is offloaded to the device when the modulated voltage signal matches the expected voltage.Type: GrantFiled: December 15, 2020Date of Patent: January 10, 2023Assignee: GM Global Technology Operations LLCInventors: Douglas S. Cesiel, Jacob A. St George, Brandon R. Jones, Aniket P. Kothari, Patricia M. Laskowsky, Bryan M. Ludwig, Bryan T. Sauter, Giovanni Spoleti, Jack M. Williams, Bo Xie, Matthew A. Thomas -
HOST SYSTEM WITH AC CHARGING INLET AND METHOD FOR IDENTIFYING AN ELECTRICAL DEVICE CONNECTED THERETO
Publication number: 20220185137Abstract: A controller of a host system executes a method for detecting an external AC electrical device. While an AC charging inlet of the host system is electrically connected to the device via different vehicle-to-live (V2L) and jump-charge connections, the controller detects a control pilot voltage and a proximity voltage. When the control pilot voltage is 0V, the controller determines whether entry conditions are satisfied indicative of a desire to offload power from the host system to the device. When the entry conditions are satisfied, the proximity or control pilot voltage are modulated to generate a modulated voltage signal, which the controller compares to an expected voltage indicative of the device. Power is offloaded to the device when the modulated voltage signal matches the expected voltage.Type: ApplicationFiled: December 15, 2020Publication date: June 16, 2022Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Douglas S. Cesiel, Jacob A. St George, Brandon R. Jones, Aniket P. Kothari, Patricia M. Laskowsky, Bryan M. Ludwig, Bryan T. Sauter, Giovanni Spoleti, Jack M. Williams, Bo Xie, Matthew A. Thomas -
Patent number: 10337930Abstract: A number of variations may include a method which may include determining a temperature rise in an IGBT junction without the use of a temperature estimation or measurement device because determination may be made by first determining the power loss due to the conduction losses of the IGBT and power loss associated with switching the IGBT where these losses may be determined by utilizing the saturation voltage of the IGBT, IGBT PWM duty cycle, IGBT switching frequency, fundamental frequency along with a lookup table for the switching energies and the phase current going through the IGBT. The determined power loss may be multiplied by a measured, sensed or obtained thermal impedance from the IGBT junction. Finally, the determined temperature rise of the IGBT junction may be added to a measured, sensed or obtained temperature of the coolant in order to determine the absolute temperature of the IGBT junction.Type: GrantFiled: May 12, 2015Date of Patent: July 2, 2019Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: S. M. Nayeem Hasan, Bryan M. Ludwig, David P. Tasky
-
Publication number: 20160334280Abstract: A number of variations may include a method which may include determining a temperature rise in an IGBT junction without the use of a temperature estimation or measurement device because determination may be made by first determining the power loss due to the conduction losses of the IGBT and power loss associated with switching the IGBT where these losses may be determined by utilizing the saturation voltage of the IGBT, IGBT PWM duty cycle, IGBT switching frequency, fundamental frequency along with a lookup table for the switching energies and the phase current going through the IGBT. The determined power loss may be multiplied by a measured, sensed or obtained thermal impedance from the IGBT junction. Finally, the determined temperature rise of the IGBT junction may be added to a measured, sensed or obtained temperature of the coolant in order to determine the absolute temperature of the IGBT junction.Type: ApplicationFiled: May 12, 2015Publication date: November 17, 2016Inventors: S.M. Nayeem Hasan, Bryan M. Ludwig, David P. Tasky
-
Patent number: 9142955Abstract: Systems and methods for a fault protection are provided that can be implemented in a hybrid electric vehicle (HEV) to limit the magnitude of a current that flows when an AC-to-chassis fault (ACF) occurs between an AC connection and the chassis of the HEV. An electric machine having a winding, an inverter sub-module (ISM) having a first switch and a second switch, and fault protection elements (FPEs), coupled to the ISM, are provided. The winding is coupled to the ISM coupled via the AC connection. The FPEs can include, for example, first and second inductances. To limit the magnitude of the current, the current can be passed along a first current path that includes the second inductance when the first switch is closed, and can be passed along a second current path that includes the first inductance when the second switch is closed.Type: GrantFiled: October 31, 2012Date of Patent: September 22, 2015Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLSInventors: Kon-King M. Wang, William T. Ivan, Bryan M. Ludwig, Kris S. Sevel
-
Patent number: 9018865Abstract: A vehicle includes a rechargeable energy storage system (RESS), an electric traction motor, a traction power inverter module (TPIM), a high-voltage direct current (HVDC) bus that electrically connects the RESS to the TPIM, a passive discharge circuit connected across the positive and negative rails of the bus, and a microprocessor. The circuit includes a semiconductor switch. The microprocessor provides an output signal at a first voltage level that opens the switch and prevents discharge of the HVDC bus when the microprocessor is operating normally, and at a default second voltage level that closes the switch in the presence of a predetermined vehicle condition to thereby discharge the HVDC bus. An optocoupler may receive the output signal, and a zener diode may be in electrical parallel with an output side of the optocoupler. The switch may be an insulated gate bipolar transistor or a thyristor in different embodiments.Type: GrantFiled: April 30, 2012Date of Patent: April 28, 2015Assignee: GM Global Technology Operations LLCInventors: John W. Meyer, III, David P. Tasky, S. M. Nayeem Hasan, Bryan M. Ludwig
-
Publication number: 20140118868Abstract: Systems and methods for a fault protection are provided that can be implemented in a hybrid electric vehicle (HEV) to limit the magnitude of a current that flows when an AC-to-chassis fault (ACF) occurs between an AC connection and the chassis of the HEV. An electric machine having a winding, an inverter sub-module (ISM) having a first switch and a second switch, and fault protection elements (FPEs), coupled to the ISM, are provided. The winding is coupled to the ISM coupled via the AC connection. The FPEs can include, for example, first and second inductances. To limit the magnitude of the current, the current can be passed along a first current path that includes the second inductance when the first switch is closed, and can be passed along a second current path that includes the first inductance when the second switch is closed.Type: ApplicationFiled: October 31, 2012Publication date: May 1, 2014Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: KON-KING M. WANG, WILLIAM T. IVAN, BRYAN M. LUDWIG, KRIS S. SEVEL
-
Patent number: 8606447Abstract: A powertrain system includes an electric motor/generator unit. Upon detecting an open high-voltage switch associated with a high-voltage DC electrical bus, low-voltage electrical power is employed to energize the high-voltage DC electrical bus, control parameters are adjusted to operate the electric motor/generator unit in a fault tolerant electric generation mode, an internal combustion engine is operated to spin the electric motor/generator unit, and the electric motor/generator unit is operated in the fault tolerant electric generation mode.Type: GrantFiled: May 23, 2011Date of Patent: December 10, 2013Assignee: GM Global Technology Operations LLCInventors: Chandra S. Namuduri, Suresh Gopalakrishnan, Keith D. Van Maanen, Bryan M. Ludwig, Bon Ho Bae
-
Publication number: 20130285581Abstract: A vehicle includes a rechargeable energy storage system (RESS), an electric traction motor, a traction power inverter module (TPIM), a high-voltage direct current (HVDC) bus that electrically connects the RESS to the TPIM, a passive discharge circuit connected across the positive and negative rails of the bus, and a microprocessor. The circuit includes a semiconductor switch. The microprocessor provides an output signal at a first voltage level that opens the switch and prevents discharge of the HVDC bus when the microprocessor is operating normally, and at a default second voltage level that closes the switch in the presence of a predetermined vehicle condition to thereby discharge the HVDC bus. An optocoupler may receive the output signal, and a zener diode may be in electrical parallel with an output side of the optocoupler. The switch may be an insulated gate bipolar transistor or a thyristor in different embodiments.Type: ApplicationFiled: April 30, 2012Publication date: October 31, 2013Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: John W. Meyer, III, David P. Tasky, S.M. Nayeem Hasan, Bryan M. Ludwig
-
Publication number: 20120303189Abstract: A powertrain system includes an electric motor/generator unit. Upon detecting an open high-voltage switch associated with a high-voltage DC electrical bus, low-voltage electrical power is employed to energize the high-voltage DC electrical bus, control parameters are adjusted to operate the electric motor/generator unit in a fault tolerant electric generation mode, an internal combustion engine is operated to spin the electric motor/generator unit, and the electric motor/generator unit is operated in the fault tolerant electric generation mode.Type: ApplicationFiled: May 23, 2011Publication date: November 29, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Chandra S. Namuduri, Suresh Gopalakrishnan, Keith D. Van Maanen, Bryan M. Ludwig, Bon Ho Bae
-
Patent number: 8314578Abstract: A hybrid powertrain system includes an electric motor/generator unit having a multiphase asynchronous AC machine electrically connected to a multiphase bridge inverter. A high-voltage capacitor is electrically connected between positive and negative sides of a high-voltage DC power bus. High-voltage DC bus pre-charge circuits are electrically connected between gate drive bias power supplies and the multiphase bridge inverter. A low-voltage battery electrically charges the high-voltage DC link capacitor via the gate drive bias power supplies and the high-voltage DC bus pre-charge circuits when the high-voltage energy storage system is disconnected from the high-voltage DC power bus.Type: GrantFiled: February 23, 2010Date of Patent: November 20, 2012Assignee: GM Global Technology Operations LLCInventors: Chandra S. Namuduri, Bryan M. Ludwig, Keith D. Van Maanen, Suresh Gopalakrishnan
-
Patent number: 8164298Abstract: Methods and systems are provided for detecting loss of isolation of a motor, connections, or phase cables while an AC motor is operating. The system includes a power supply that is substantially isolated from the ground or chassis having a power supply voltage, and a power inverter electrically coupled to the power supply. The power inverter is configured to provide AC current from the power supply in an AC phase at an AC terminal, with the phase having current at a fundamental frequency that controls the motor speed. An electric motor is electrically coupled to the AC terminal of the power inverter and has a chassis that is substantially electrically isolated from the AC terminal of the power inverter under normal operating conditions. A processor is configured to control the AC current provided by the power inverter. The processor is configured to receive a first voltage signal related to current flowing through a motor chassis.Type: GrantFiled: March 26, 2009Date of Patent: April 24, 2012Assignee: GM Global Technology Operations LLCInventors: Mohammad N. Anwar, Bryan M. Ludwig, S.M. N. Hasan, Sean E. Gleason, Bon Ho Bae
-
Publication number: 20100244760Abstract: Methods and systems are provided for detecting loss of isolation of a motor, connections, or phase cables while an AC motor is operating. The system includes a power supply that is substantially isolated from the ground or chassis having a power supply voltage, and a power inverter electrically coupled to the power supply. The power inverter is configured to provide AC current from the power supply in an AC phase at an AC terminal, with the phase having current at a fundamental frequency that controls the motor speed. An electric motor is electrically coupled to the AC terminal of the power inverter and has a chassis that is substantially electrically isolated from the AC terminal of the power inverter under normal operating conditions. A processor is configured to control the AC current provided by the power inverter. The processor is configured to receive a first voltage signal related to current flowing through a motor chassis.Type: ApplicationFiled: March 26, 2009Publication date: September 30, 2010Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Mohammad N. Anwar, Bryan M. Ludwig, S.M. N. Hasan, Sean E. Gleason, Bon Ho Bae
-
Publication number: 20100225258Abstract: A hybrid powertrain system includes an electric motor/generator unit having a multiphase asynchronous AC machine electrically connected to a multiphase bridge inverter. A high-voltage capacitor is electrically connected between positive and negative sides of a high-voltage DC power bus. High-voltage DC bus pre-charge circuits are electrically connected between gate drive bias power supplies and the multiphase bridge inverter. A low-voltage battery electrically charges the high-voltage DC link capacitor via the gate drive bias power supplies and the high-voltage DC bus pre-charge circuits when the high-voltage energy storage system is disconnected from the high-voltage DC power bus.Type: ApplicationFiled: February 23, 2010Publication date: September 9, 2010Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Chandra S. Namuduri, Bryan M. Ludwig, Keith D. Van Maanen, Suresh Gopalakrishnan