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公开(公告)号：US20250162460A1
公开(公告)日：2025-05-22
申请号：US18516152
申请日：2023-11-21
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Renato Amorim Torres , Neeraj S. Shidore , Suresh Gopalakrishnan , Wesley G. Zanardelli , Madhusudan Raghavan , Satish P. Ketkar , Vinod Chowdary Peddi , Chandra S. Namuduri , Lei Hao
Abstract: A multi-motor electrical system for a motor vehicle or another host system includes a plurality of inverter circuits connected to the battery pack, a plurality of electric motors connected to the battery pack via a corresponding one of the inverter circuits, and an electronic controller. In response to predetermined entry conditions, the controller is configured to perform a method by which the controller monitors respective motor temperatures of the motors, selectively injects respective direct-axis (d-axis) currents into the motors via manipulation of a corresponding d-axis voltage command thereto, and generates an alternating current (AC) battery current via simultaneous operation of the electric motors using the d-axis currents. The controller heats the battery pack using the AC battery current by coordinating an injection of the d-axis currents, such that the respective motor temperatures do not exceed a predetermined motor temperature limit.
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公开(公告)号：US20250119086A1
公开(公告)日：2025-04-10
申请号：US18481438
申请日：2023-10-05
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Junghoon Kim , Chandra S. Namuduri , Yilun Luo
Abstract: A motor vehicle includes a multiphase AC electric motor having a stator wound with a first stator winding set including three phases and a second stator winding set including three phases, the three phases of the first stator winding set and the three phases of the second stator winding set wound oppositely to one another in the stator. Additionally, the motor vehicle includes a source of stored electrical energy and an inverter coupled to the source of stored electrical energy and to the electric motor to provide switched electrical energy to the first stator winding set and the second stator winding set. In addition, the motor vehicle includes a driver configured to simultaneously switch a relatively high side of the inverter to a first phase of the first stator winding set and a relatively low side of the inverter to a corresponding first phase of the second stator winding set.
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公开(公告)号：US20250119029A1
公开(公告)日：2025-04-10
申请号：US18480655
申请日：2023-10-04
Applicant: GM Global Technology Operations LLC
Inventor： Suresh Gopalakrishnan , Craig S. Ross , Chandra S. Namuduri , Chunhao J. Lee , Thomas W. Nehl , Yulei Chen
IPC: H02K11/215
Abstract: An electric drive unit includes a housing and a rotor rotatably supported in the housing. The rotor includes a rotor shaft defining a rotor axis and a plurality of rotor laminations fixedly mounted to the shaft. The plurality of rotor laminations support a plurality of magnetic poles, and a hydraulic unit connected to the plurality of rotor laminations. The hydraulic unit has a magnetic shunt that is selectively shiftable relative to the plurality of magnetic poles. A position sensing system is operable to detect a rotational speed of the rotor and a position of the magnetic shunt relative to the plurality of magnetic poles. The position sensing system includes a rotor shaft position trigger coupled for rotation with the rotor shaft, and a magnetic shunt position trigger supported by the hydraulic unit.
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公开(公告)号：US12257873B2
公开(公告)日：2025-03-25
申请号：US17863514
申请日：2022-07-13
Applicant: GM Global Technology Operations LLC
Inventor： Alireza Fatemi , Thomas W. Nehl , Chandra S. Namuduri , Brian K Saylor , Nilesh D. Mankame , Anthony Michael Coppola
Abstract: A vehicle, suspension system and method of dampening a force on the suspension system is disclosed. The suspension system includes a damper having a first damping element and a second damping element configured to rotate relative to each other in response to a force received at the suspension system. The second damping element induces an eddy current in the first damping element during relative rotation. A feature of one at least one of the first damping element and the second damping element provides a first electrical resistance to the eddy current during relative rotation in a first direction and a second electrical resistance to the eddy current during relative rotation in a second direction. The first electrical resistance generates a first damping force and the second electrical resistance generates a second damping force.
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公开(公告)号：US12246606B2
公开(公告)日：2025-03-11
申请号：US17550004
申请日：2021-12-14
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Lei Hao , Chandra S. Namuduri , Chengwu Duan , Suresh Gopalakrishnan , Neeraj S. Shidore , Venkata Prasad Atluri
Abstract: A power control system for a vehicle includes a charge port and a contactor connected to the charge port and including a first plurality of switches. An energy storage system includes a second plurality of switches and one or more battery packs. A bi-directional DC-DC converter is connected between the energy storage system and a plurality of vehicle loads. A controller is configured to control states of the first and second plurality of switches to configure in a plurality of modes including a range improvement mode, a first charging mode to perform charging at a first voltage level, a second charging mode to perform charging at a second voltage level, a battery preconditioning mode; and an accessory load support mode.
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Patent Agency Ranking
公开(公告)号：US20250010761A1
公开(公告)日：2025-01-09
申请号：US18347874
申请日：2023-07-06
Applicant: GM Global Technology Operations LLC
Inventor： Muhammad Hussain Alvi , Chandra S. Namuduri , Suresh Gopalakrishnan , Junghoon Kim , Yilun Luo
Abstract: A multi-level inverter control system includes a power storage system having a high voltage terminal, a low voltage terminal, and an intermediate voltage terminal. The intermediate voltage terminal is at a voltage between the high voltage terminal and the low voltage terminal. A multi-level inverter includes a plurality of switches, a high voltage input connected to the high voltage terminal, a low voltage input connected to the low voltage terminal, and an intermediate voltage input connected to the intermediate voltage terminal. A controller is controllably coupled to the multi-level inverter. The controller includes at least a processor and a memory. The memory stores instructions configured to cause the controller to operate the multi-level inverter in a three-level inverter mode, a full power two-level inverter mode, a first partial power two-level inverter mode and a second partial power two-level inverter mode.
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公开(公告)号：US12179605B1
公开(公告)日：2024-12-31
申请号：US18343139
申请日：2023-06-28
Applicant: GM Global Technology Operations LLC
Inventor： Orgun A. Guralp , Suresh Gopalakrishnan , Chandra S. Namuduri
Abstract: A system for controlling a propulsion system of a vehicle includes a switching system including a first switching device connecting a battery system to a first set of windings of an electric motor, and a second switching device connecting the battery system to a second set of windings. The system also includes a controller configured to transition the propulsion system from an initial propulsion mode in which an initial voltage is applied to the electric motor, to a target mode in which a target voltage is applied. The transitioning includes controlling the first switching device to provide current to the first set of windings at the initial voltage to produce torque, and subsequently controlling the second switching device to cause the battery system to apply the target voltage to the second set of windings while the current is provided to the first set of windings at the initial voltage.
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公开(公告)号：US12151588B2
公开(公告)日：2024-11-26
申请号：US17587632
申请日：2022-01-28
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mark Daniel Gottlieb , Venkata Prasad Atluri , Madhusudan Raghavan , Chandra S. Namuduri , Suresh Gopalakrishnan
Abstract: A power control system for a battery system of a vehicle includes one or more supplemental protection devices that are connected to at least one of a first contactor, a second contactor, one of N fuses, and one of N vehicle loads. A battery management module is configured to measure and store a plurality of state of health parameters for the battery system and to selectively operate the one or more supplemental protection devices in a coverage gap between first and second coverage areas handled by the first contactor and the second contactor and the N fuses based on a calibration function and/or calibration parameters. A telematics system selectively sends the plurality of state of health parameters for the battery system to a remote server and to receive at least one of a new calibration function and new calibration parameters for the vehicle from the remote server.
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公开(公告)号：US20240380334A1
公开(公告)日：2024-11-14
申请号：US18315081
申请日：2023-05-10
Applicant: GM Global Technology Operations LLC
Inventor： Muhammad Hussain Alvi , Renato Amorim Torres , Chandra S. Namuduri , Rashmi Prasad
Abstract: A multilevel inverter includes a set of inverter switches arranged in a multilevel inverter topology. The multilevel inverter topology has a high voltage (V) input, a low voltage input and an intermediate voltage input. A first voltage source connects the high voltage input to the intermediate voltage input and a second voltage source connects the intermediate voltage input to the low voltage source.
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10.发明公开公开(公告)号：US20240363288A1
公开(公告)日：2024-10-31
申请号：US18308201
申请日：2023-04-27
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Junghoon Kim , Muhammad Hussain Alvi , Rashmi Prasad , Chandra S. Namuduri , Yilun Luo
CPC classification number: H01G4/30 , B60L50/60 , H01G4/228 , B60L2210/10 , B60L2210/40
Abstract: Aspects of the disclosure include a symmetric direct current (DC) link capacitor having a low parasitic equivalent series L-inductance (ESL). An exemplary capacitor can include one or more positive-dielectric-negative (PDN) stacks having a positive layer, a negative layer, and a dielectric layer between the positive layer and the negative layer. A first contact layer is electrically coupled to the positive layer on a sidewall of the one or more PDN stacks and a second contact layer is electrically coupled to the negative layer on the sidewall of the one or more PDN stacks. A positive terminal is electrically coupled to the first contact layer and a negative terminal is electrically coupled to the second contact layer.
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