公开(公告)号：US20210402887A1

公开(公告)日：2021-12-30

申请号：US16915296

申请日：2020-06-29

Applicant: GM Global Technology Operations LLC

Inventor： Rashmi Prasad ,  Chandra S. Namuduri ,  Suresh Gopalakrishnan ,  Thomas W. Nehl

IPC: B60L53/60 ,  B60L50/60 ,  B60L58/18

Abstract: A method of controlling fast charging of at least one battery pack within a high voltage electrical propulsion system includes identifying an operating condition, wherein the operating condition is one of charging mode and propulsion mode, and, when the electrical system is in charging mode, initiating charging of the at least one battery pack, terminating charging of the at least one battery pack and connecting the at least one battery pack to power components of the electrical propulsion system when there is a request to terminate charging of the at least one battery pack, and terminating charging of the at least one battery pack and connecting the at least one battery pack to power components of the electrical propulsion system when there is no request to terminate charging of the at least one battery pack and the charging of the at least one battery pack is complete.

公开(公告)号：US11199169B1

公开(公告)日：2021-12-14

申请号：US17236449

申请日：2021-04-21

Applicant: GM Global Technology Operations LLC

Inventor： Chandra S. Namuduri ,  Suresh Gopalakrishnan ,  Pranjal Sharma

IPC: F02N11/08 ,  F02N5/04 ,  F02N15/06 ,  F02N19/00

Abstract: An electric starter system for an internal combustion includes a pinion gear, a pinion solenoid coupled to the pinion gear, a starter motor that is selectively connectable to the flywheel of the engine via the pinion gear, and a controller in communication with the pinion solenoid and the starter motor. In response to an engine auto-stop signal, the controller is configured to translate the pinion gear into contact with the flywheel and the motor, and cause rotation of the engine crankshaft to a predetermined crank angle. In response to an engine auto-start signal, the controller is configured to command delivery of motor torque from the starter motor, through the pinion gear, and to the flywheel for a duration sufficient for starting the engine.

公开(公告)号：US20210344187A1

公开(公告)日：2021-11-04

申请号：US16863412

申请日：2020-04-30

Applicant: GM Global Technology Operations LLC

Inventor： Chandra S. Namuduri ,  Rashmi Prasad ,  Thomas W. Nehl ,  David J. Brooks

IPC: H02H3/08 ,  H05K1/18

Abstract: A disconnect device includes a mounting plate having a thermally conductive substrate applied onto the mounting plate. A first layer of an electrically conductive material is applied onto the substrate. A semiconductor switch supported on the first layer connects or disconnects an input power source to or from a load. A second layer of an electrically conductive material applied onto the substrate is electrically isolated from the first layer. An electronic sensing, control and protection circuit is supported on the second layer and is connected to the semiconductor switch to control operation of the semiconductor switch. A control unit in communication with the electronic sensing, control and protection circuit via an electrically isolated control path provides control and communication between the electronic sensing, control and protection circuit and the semiconductor switch.

公开(公告)号：US20210234447A1

公开(公告)日：2021-07-29

申请号：US16774696

申请日：2020-01-28

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Suresh Gopalakrishnan ,  Chandra S. Namuduri ,  Alexandru Rajala ,  Thomas W. Nehl ,  Xiaohui Du ,  Edward L. Kaiser

IPC: H02K24/00 ,  H02K7/00 ,  H02K11/225 ,  B60L50/60 ,  B60L53/22

Abstract: An electric machine includes a machine rotor circumscribed by a machine stator, and having a rotor shaft, rotor stack, and end cap which rotate about an axis. The end cap includes lobes equal in number to a number of pole pairs of the machine rotor. A position sensor assembly has a predetermined alignment with the machine rotor and stator. The sensor assembly includes a sensor rotor formed by the lobes and a sensor stator having a printed circuit board with conductive sine and cosine traces. Machine rotor rotation causes the sensor assembly to output an unmodulated sine and cosine signals to a controller, which then calculates a calibrated reference angle. A magnetic axis of an electrical phase of the machine is aligned with and bisects a peak of the sine trace. A direct axis of the machine rotor aligns with an edge of a lobe.

公开(公告)号：US20210135588A1

公开(公告)日：2021-05-06

申请号：US16674576

申请日：2019-11-05

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Rashmi Prasad ,  Chandra S. Namuduri

IPC: H02M5/293 ,  G01R1/04 ,  H02M1/42 ,  H02M3/28

Abstract: An AC electronic solid-state switch includes an electrically insulating and thermally conductive layer, a first electrically conductive trace, a second electrically conductive trace, and a plurality of semiconductor dies each electrically connected to the first electrically conductive trace and the second electrically conductive trace. Each of the plurality of semiconductor dies forms a MOSFET, IGBT or other types of electronically controllable switch. The AC electronic solid-state switch further includes a common drain conductor that is electrically connected to each drain terminal of the plurality of semiconductor dies. The AC electronic solid-state switch is configured to block between 650 volts and 1700 volts in the off-state in a first direction and a second direction, the second direction being opposite the first direction, and the AC electronic solid-state switch is configured to carry at least 500 A continuously in the on-state with a voltage drop of less than 2V.

公开(公告)号：US10917030B1

公开(公告)日：2021-02-09

申请号：US16570168

申请日：2019-09-13

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Lei Hao ,  Chandra S. Namuduri ,  Rashmi Prasad

IPC: H02P25/18 ,  B60L15/20 ,  H02K3/28

Abstract: An electric drive system includes a battery pack, a power inverter module (“PIM”), an electric machine, a switching circuit, and a controller. The electric machine has three or more phase legs. The PIM has a DC-side connected to the battery pack, and an alternating current (“AC”)-side connected to the electric machine. The switching circuit includes AC switches. For each phase leg the circuit also includes three or more winding sections each electrically connectable to or disconnectable from the PIM via the AC switches. The controller commands a binary switching state of each respective AC switch based on the rotary speed to implement one of four different speed-based operating modes of the electric machine, and to thereby vary a conductive path from the PIM to the electric machine through one or more of the connected winding sections.

公开(公告)号：US10895237B1

公开(公告)日：2021-01-19

申请号：US16511860

申请日：2019-07-15

Applicant: GM Global Technology Operations LLC

Inventor： Farzad Samie ,  Chunhao J. Lee ,  Lei Hao ,  Chandra S. Namuduri

IPC: F02N11/08

Abstract: An electric starter system is disclosed for use with an engine having a flywheel. The electric starter system includes a pinion gear and a solenoid device coupled to the pinion gear. The solenoid device is movable between a pre-engaged position when the pinion gear is moved into engagement with the flywheel and a disengaged position when the pinion gear is disengaged from the flywheel. A brushless starter motor is selectively connectable to the flywheel of the engine via the pinion gear during a requested engine start event. A latch mechanism is selectively engageable with the solenoid device. The latch mechanism is moveable between a latched position in which the solenoid device is mechanically held in the pre-engaged position and an unlatched position in which the solenoid device is released for movement to the disengaged position.

公开(公告)号：US10724491B2

公开(公告)日：2020-07-28

申请号：US15967918

申请日：2018-05-01

Applicant: GM Global Technology Operations LLC

Inventor： Chandra S. Namuduri ,  Kenneth J. Shoemaker ,  Chunhao J. Lee ,  Lei Hao ,  Thomas W. Nehl ,  Suresh Gopalakrishnan

IPC: F02N11/00 ,  F02N11/08

Abstract: An electric starter system is used with an engine. The starter system may include a solenoid device coupled to a pinion gear, a brushless starter motor connectable to the engine via the pinion gear during a requested engine start event, and a controller. In response to the start event, when the engine speed is less than a threshold speed, the controller delivers a control current to the solenoid device at a peak current level sufficient for translating the pinion gear into contact with the flywheel. The control current is reduced to a holding current level less than the peak current level after the pinion gear is engaged with the flywheel. Motor torque is commanded from the starter motor, through the pinion gear, and to the flywheel while maintaining the holding current level, and held for a duration sufficient for starting the engine.

公开(公告)号：US20200235440A1

公开(公告)日：2020-07-23

申请号：US16251766

申请日：2019-01-18

Applicant: GM Global Technology Operations LLC

Inventor： Lei Hao ,  Yue-Yun Wang ,  Chandra S. Namuduri ,  Suresh Gopalakrishnan ,  Thomas W. Nehl ,  Dongxu Li

IPC: H01M10/44 ,  G01R19/165 ,  H01M10/48 ,  H01M10/42

Abstract: Presented are battery pack voltage-switching (“V-switch”) systems, methods for making/operating such systems, and multi-pack, electric-drive motor vehicles with battery pack V-switch capabilities. A method for controlling operation of a vehicle includes a vehicle controller receiving a voltage switch signal to change a voltage output of the vehicle's battery system. The vehicle controller determines if a speed of a traction motor is less than a calibrated base speed; if so, the controller transmits a pack isolation signal to a power inverter to electrically disconnect the traction battery packs from the traction motor. The vehicle controller determines if a bus current of a DC bus is less than a calibrated bus current threshold; if so, the controller transmits an open signal to open one or more pack contactor switches and a close signal to close one or more pack contactor switches thereby causing the vehicle battery system to output the second voltage.

公开(公告)号：US10479220B2

公开(公告)日：2019-11-19

申请号：US15484537

申请日：2017-04-11

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Chandra S. Namuduri ,  Venkata Prasad Atluri ,  Suresh Gopalakrishnan

IPC: B60L50/61 ,  B60L58/18 ,  B60K6/28 ,  F02N11/08 ,  B60R16/04

Abstract: A powertrain includes a motor-generator that is coupled to an engine. A starter mechanism is coupled to the engine. A first energy storage device is disposed in a parallel electrical relationship with the starter mechanism. A second energy storage device is disposed in a parallel electrical relationship with the motor-generator. The electrical circuit exhibits a first electrical resistance between the first energy storage device and the motor-generator, and a second electrical resistance between the second energy storage device and the motor-generator. The first electrical resistance is greater than the second electrical resistance so that electrical energy from the motor-generator more easily flows to the second energy storage device than the first energy storage device, and the motor-generator more easily draws electrical energy from the second energy storage device than from the first energy storage device.