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公开(公告)号：US10473081B1
公开(公告)日：2019-11-12
申请号：US15961094
申请日：2018-04-24
Applicant: GM Global Technology Operations LLC
Inventor： Lei Hao , Suresh Gopalakrishnan , Chandra S. Namuduri
Abstract: An electric starter system includes a brushless alternating current (AC) starter motor selectively coupled to an engine and having a rotor with a rotor position. A position sensor generates measured position signals indicative of rotor position. A controller is in communication with the sensor. The controller has sensorless logic, e.g., a BEMF, inductance, or high-frequency signal injection method, for generating an estimated rotor position. The controller executes a method in which, below a threshold speed of the starter motor, the controller calibrates the sensorless logic using the measured position signals and controls a torque operation of the starter motor using the measured position signals. Above the threshold speed, the torque operation is controlled solely using the estimated rotor position. A powertrain includes the engine, a transmission, a drive shaft, and a load, along with the electric starter system.
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公开(公告)号：US20190338744A1
公开(公告)日：2019-11-07
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: F02N11/08
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.
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公开(公告)号：US20190338743A1
公开(公告)日：2019-11-07
申请号：US15967904
申请日：2018-05-01
Applicant: GM Global Technology Operations LLC
Inventor： Suresh Gopalakrishnan , Lei Hao , Chandra S. Namuduri , Paul S. Lombardo , Jeffrey R. Aldrich , Chunhao J. Lee , Neeraj S. Shidore
Abstract: An engine starter system includes a starter including a multi-phase brushless electric motor and an electronic commutator assembly. A controller includes an instruction set that is executable in response to a command to execute an engine starting event. Operation includes determining a desired starting profile, controlling the starter to engage a rotatable member of the engine, and monitoring the rotational speed of the electric motor via a rotor position sensing circuit. The starter inverter is dynamically controlled to control the electric motor to spin the rotatable member of the internal combustion engine responsive to the desired starting profile, including dynamically controlling the starter inverter to control the electric motor to control the spin of the engine responsive to the desired starting profile to prevent occurrence of an engine speed flare event during the engine starting event.
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54.发明申请公开(公告)号：US20190323472A1
公开(公告)日：2019-10-24
申请号：US15961128
申请日：2018-04-24
Applicant: GM Global Technology Operations LLC
Inventor： Lei Hao , Chandra S. Namuduri , Suresh Gopalakrishnan
Abstract: An electric starter system is usable with an engine and a power inverter module (PIM), e.g., of a powertrain. The starter system includes a polyphase/AC brushless starter motor connected to the PIM via an AC voltage bus and selectively connected to the engine during a requested engine start event. A sensor on the DC voltage bus outputs a signal indicative of a voltage level of the DC voltage bus. The controller executes a method using voltage stabilization logic having a proportional-integral (PI) torque control loop. Logic execution in response to the requested engine starting event causes the controller to control the starter motor, when the bus voltage exceeds a calibrated minimum voltage, using a starting torque determined via the control loop. The commanded starting torque limits inrush current to the starter motor such that the DC voltage bus remains above the minimum voltage.
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公开(公告)号：US20190323470A1
公开(公告)日：2019-10-24
申请号：US15961204
申请日：2018-04-24
Applicant: GM Global Technology Operations LLC
Inventor： Chandra S. Namuduri , Thomas W. Nehl , Lei Hao
IPC: F02N11/08
Abstract: A starter system includes a brushless electric starter motor and a battery power pack, the motor operatively connectable to an internal combustion engine of a powertrain. A power inverter converts direct current provided from the battery power pack to multi-phase alternating current to drive the motor. A pinion gear with one-way clutch is rotatably driven by the motor and movable between a disengaged position and an engaged position in which the pinion gear is meshingly engaged with a ring gear operatively connected to a crankshaft of the engine. A solenoid is operatively connected to the pinion gear. An electronic control system controls the motor to crank the engine using power provided from the battery power pack, and to separately command the solenoid to a disabled or an enabled state. A method of controlling the starter system controls the motor to crank the engine in a restart following an autostop.
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Patent Agency Ranking
公开(公告)号：US20190165713A1
公开(公告)日：2019-05-30
申请号：US15895392
申请日：2018-02-13
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chandra S. Namuduri , Thomas W. Nehl , Lei Hao
CPC classification number: H02P27/06 , B60L50/51 , B60L2210/40 , H02J7/0063 , H02M1/08 , H02M7/537 , H02M7/5387
Abstract: An electric powertrain includes an electric machine, an inverter connected to the electric machine, and an energy storage system for providing an electric current. The energy storage system includes a first energy storage device operable at a first device voltage, and a second energy storage device operable at a second device voltage. A plurality of low-loss switching devices interconnect the first energy storage device and the second energy storage device. The switching devices are selectively controllable between a first operating mode for providing the electric current at a first system voltage, and a second operating mode for providing the electric current at a second system voltage. The first system voltage is different from the second system voltage.
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公开(公告)号：US20190145370A1
公开(公告)日：2019-05-16
申请号：US15811740
申请日：2017-11-14
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Lei Hao , Chandra S. Namuduri , Suresh Gopalakrishnan
CPC classification number: F02N11/087 , F02N2011/0874 , H02P6/28 , H02P23/0004
Abstract: A starter for an internal combustion engine includes a multi-phase brushless electric motor, a controller and an inverter. A method for controlling the starter includes determining initial current commands for operating the electric motor in response to an activation command. Electrical current supplied to the electric motor and a rotational position of an output member of the electric motor are monitored. The electrical current is monitored directly without an intervening current prediction step. Interim voltage commands are determined based upon the initial current commands and the monitored currents, and final voltage commands are determined by subjecting the interim voltage commands to voltage limits. A rotational position compensation term is determined based upon the rotational position and rotational speed of the electric motor, and operation of the inverter is controlled to control the electric motor based upon the final voltage commands and the rotational position compensation term.
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公开(公告)号：US10284036B2
公开(公告)日：2019-05-07
申请号：US15194597
申请日：2016-06-28
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Lei Hao , Chandra S. Namuduri , Thomas W. Nehl
Abstract: An electric machine is provided that has a rotor assembly having a rotor core configured to support permanent magnets spaced around the rotor core to define a number of rotor poles. The rotor core has multiple rotor slots arranged as multiple barrier layers at each of the rotor poles. The multiple barrier layers are positioned adjacent one another between an inner periphery of the rotor core and an outer periphery of the rotor core and include a first barrier layer nearest the inner periphery. Permanent magnets are disposed in at least the first barrier layer. A stator assembly surrounds the rotor assembly. The electric machine is configured to function as a motor in a motoring mode and as a generator in a generating mode. The electric machine is configured with predetermined operating parameters selected for optimizing operation in the motoring mode and/or the generating mode.
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59.发明申请公开(公告)号：US20190103797A1
公开(公告)日：2019-04-04
申请号：US15723476
申请日：2017-10-03
Applicant: GM Global Technology Operations LLC
Inventor： Shifang Li , Thomas W. Nehl , Suresh Gopalakrishnan , Avoki Omekanda , Rashmi Prasad , Chandra S. Namuduri
IPC: H02K33/18 , H01F7/18 , F02M47/02 , F02M63/00 , H01F7/08 , F02M51/06 , F02M61/12 , H02K33/02 , H01F7/04 , H02K33/10
CPC classification number: H02K33/18 , F02D41/14 , F02D41/20 , F02D2041/1433 , F02D2041/2044 , F02D2041/2058 , F02M47/027 , F02M51/061 , F02M51/0642 , F02M61/12 , F02M63/0024 , H01F7/04 , H01F7/064 , H01F7/081 , H01F7/18 , H01F7/1844 , H01F2007/1669 , H01F2007/1684 , H01F2007/1855 , H01F2007/1861 , H02K33/02 , H02K33/10
Abstract: A solenoid assembly includes a solenoid actuator having a core. A coil is configured to be wound at least partially around the core such that a magnetic flux (ϕ) is generated when an electric current flows through the coil. An armature is configured to be movable based on the magnetic flux (ϕ). A controller has a processor and tangible, non-transitory memory on which is recorded instructions for controlling the solenoid assembly. The controller is configured to obtain a plurality of model matrices, a coil current (i1) and an eddy current (i2). The magnetic flux (ϕ) is obtained based at least partially on a third model matrix (C0), the coil current (i1) and the eddy current (i2). Operation of the solenoid actuator is controlled based at least partially on the magnetic flux (ϕ). In one example, the solenoid actuator is an injector.
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公开(公告)号：US09979336B2
公开(公告)日：2018-05-22
申请号：US14810738
申请日：2015-07-28
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chandra S. Namuduri , Suresh Gopalakrishnan
Abstract: A generator system includes an AC machine including a plurality of armature coils and a rectifier circuit electrically coupled to the armature coils. The rectifier circuit includes a plurality of switches. The generator system additionally includes a sensor device electrically coupled to a control circuit. The sensor device is configured to determine a rotor position of the AC machine. The control circuit determines a desired phase angle between a phase current and an induced voltage of the AC machine and provides a control signal to the rectifier circuit to switch the switches on and off to convert an AC signal to a DC signal and to control the rotor position of the AC machine to achieve the desired phase angle.
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