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公开(公告)号：US12100943B2
公开(公告)日：2024-09-24
申请号：US17830179
申请日：2022-06-01
Applicant: Caterpillar Inc.
Inventor： Jesse R. Gerdes , Jackson Wai , Seok-hee Han
IPC: H02H3/08 , H02M1/00 , H02M1/32 , H02M7/5387 , H02P29/024
CPC classification number: H02H3/083 , H02M1/0009 , H02M1/32 , H02M7/53871 , H02P29/027
Abstract: An apparatus can include an inverter to provide an output N-phase alternating-current to an external component. When N equals two, a phase of the N phases can include an upper gate and a lower gate. The apparatus can also include a current detector configured to detect a phase current magnitude of the output alternating current. The apparatus can also include a controller coupled to the current detector and to the inverter. The controller can generate a gate command for controlling a gate of the inverter. The controller can also determine a value for a current threshold less than a shutoff current threshold for the external component. The controller can provide a protection command to turn off the upper gate of a corresponding phase of the inverter responsive to detecting that the phase current magnitude is greater than the current threshold.
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公开(公告)号：US20220200501A1
公开(公告)日：2022-06-23
申请号：US17132076
申请日：2020-12-23
Applicant: Caterpillar Inc.
Inventor： Jesse R. Gerdes , Thomas M. Sopko , Carlos E. Nino Baron , Jackson Wai , Ahmed Khalil , Sajan Abdul , Amara Ashfaq , James Michael Thorne
Abstract: A work machine includes a frame, a traction system supporting the frame, a power source mounted on the frame, a switched reluctance motor, an inverter configured to control power to the motor from a power source, and a controller. The controller is configured to receive a signal indicating a desired torque and determine if the desired torque is between an upper threshold and a lower threshold. If the desired torque is between the upper threshold and the lower threshold, pulse width modulation is used to produce a PWM adjusted torque command, and the motor is commanded based on the PWM adjusted torque command. The PWM adjusted torque command is configured to cycle between the upper threshold and the lower threshold to produce the desired torque.
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公开(公告)号：US20240079876A1
公开(公告)日：2024-03-07
申请号：US17901585
申请日：2022-09-01
Applicant: Caterpillar Inc.
Inventor： Seok-hee Han , Jesse R. Gerdes , Jackson Wai
CPC classification number: H02J3/16 , H02J7/007182 , H02J7/345 , H02J2207/50
Abstract: Techniques to limit electrical power when forming an electrical grid using an active front end unit having an inverter that is coupled to a capacitor (and inductor) that is coupled to an electrical grid. For example, to limit power, the integration of a commanded frequency of the system can be limited to be within a specified phase delta of a measured phase angle of an electrical grid voltage vector. The calculation from power limit to phase delta can be done when the phase of the electrical grid voltage vector has been determined to be accurate and is calculated based on the measured capacitor voltage, grid voltage, and the estimated voltage drop across the output components of the system.
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公开(公告)号：US11515824B2
公开(公告)日：2022-11-29
申请号：US17129201
申请日：2020-12-21
Applicant: Caterpillar Inc.
Inventor： Jesse R. Gerdes , Jackson Wai , Ahmed Khalil , James Michael Thorne , Sajan Abdul , Amara Ashfaq
IPC: H02P6/18 , H02P25/098 , H02P21/20 , H02P25/08
Abstract: A system and method for torque compensation in a switched reluctance (SR) machine disposed on a machine is disclosed. The system may comprise a SR machine, an inverter and a controller. The controller is in operable communication with the inverter and is configured to determine a commanded main current associated with energization by a main current of a first portion of the plurality of windings for a controlling phase, and determine a commanded parasitic current associated with energization by a parasitic current of a second portion of the windings in a non-controlling phase. The controller is further configured to determine an offset current based on the commanded parasitic current, and determine a target current based on a first sum of the commanded main current and the offset current, and command the inverter to actuate the target current in the first portion of the windings during the controlling phase.
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公开(公告)号：US20220200502A1
公开(公告)日：2022-06-23
申请号：US17129201
申请日：2020-12-21
Applicant: Caterpillar Inc.
Inventor： Jesse R. Gerdes , Jackson Wai , Ahmed Khalil , James Michael Thorne , Sajan Abdul , Amara Ashfaq
IPC: H02P25/098 , H02P21/20 , H02P25/08
Abstract: A system and method for torque compensation in a switched reluctance (SR) machine disposed on a machine is disclosed. The system may comprise a SR machine, an inverter and a controller. The controller is in operable communication with the inverter and is configured to determine a commanded main current associated with energization by a main current of a first portion of the plurality of windings for a controlling phase, and determine a commanded parasitic current associated with energization by a parasitic current of a second portion of the windings in a non-controlling phase. The controller is further configured to determine an offset current based on the commanded parasitic current, and determine a target current based on a first sum of the commanded main current and the offset current, and command the inverter to actuate the target current in the first portion of the windings during the controlling phase.
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Patent Agency Ranking
公开(公告)号：US12142922B2
公开(公告)日：2024-11-12
申请号：US17901585
申请日：2022-09-01
Applicant: Caterpillar Inc.
Inventor： Seok-hee Han , Jesse R. Gerdes , Jackson Wai
Abstract: Techniques to limit electrical power when forming an electrical grid using an active front end unit having an inverter that is coupled to a capacitor (and inductor) that is coupled to an electrical grid. For example, to limit power, the integration of a commanded frequency of the system can be limited to be within a specified phase delta of a measured phase angle of an electrical grid voltage vector. The calculation from power limit to phase delta can be done when the phase of the electrical grid voltage vector has been determined to be accurate and is calculated based on the measured capacitor voltage, grid voltage, and the estimated voltage drop across the output components of the system.
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公开(公告)号：US20240079870A1
公开(公告)日：2024-03-07
申请号：US17901509
申请日：2022-09-01
Applicant: Caterpillar Inc.
Inventor： Seok-hee Han , Jesse R. Gerdes , Jackson Wai
IPC: H02J3/00 , G05B19/042
CPC classification number: H02J3/001 , G05B19/042 , G05B2219/2639
Abstract: Techniques to reduce discontinuities in power, for example, by controlling an electrical power output of an active front end unit during a transition between a first operating mode and a second operating mode. In some examples, to reduce discontinuities, a control unit of the active front end unit can seed the integrator of proportional-integral (PI) controllers that are brought online during the operating mode change with a value that represents the proper state of the current system, such as the measured or calculated value of the component the PI controller is controlling). In other examples, to reduce discontinuities, a control unit of the active front end unit can control reference frame alignment during a transition between a first operating mode and a second operating mode.
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公开(公告)号：US20230396054A1
公开(公告)日：2023-12-07
申请号：US17830179
申请日：2022-06-01
Applicant: Caterpillar Inc.
Inventor： Jesse R. Gerdes , Jackson Wai , Seok-hee Han
IPC: H02H3/08 , H02M1/00 , H02M1/32 , H02M7/5387 , H02P29/024
CPC classification number: H02H3/083 , H02M1/0009 , H02M1/32 , H02M7/53871 , H02P29/027
Abstract: An apparatus can include an inverter to provide an output N-phase alternating-current to an external component. When N equals two, a phase of the N phases can include an upper gate and a lower gate. The apparatus can also include a current detector configured to detect a phase current magnitude of the output alternating current. The apparatus can also include a controller coupled to the current detector and to the inverter. The controller can generate a gate command for controlling a gate of the inverter. The controller can also determine a value for a current threshold less than a shutoff current threshold for the external component. The controller can provide a protection command to turn off the upper gate of a corresponding phase of the inverter responsive to detecting that the phase current magnitude is greater than the current threshold.
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公开(公告)号：US20150192632A1
公开(公告)日：2015-07-09
申请号：US14150119
申请日：2014-01-08
Applicant: Caterpillar Inc.
Inventor： Alexander C. Crosman, III , Ernesto Inoa , Jesse R. Gerdes
CPC classification number: G01R31/025 , G01R31/086 , G01R31/343
Abstract: A technique and system for detecting a location of a ground fault in an electrical system are provided. The technique and system include steps or components for determining a ground fault voltage, receiving a gate control signal associated with an electric load, comparing the ground fault voltage to the gate control signal, and determining whether the ground fault is located at the electric load based on the comparison of the ground fault voltage to the gate control signal.
Abstract translation: 提供了用于检测电气系统中接地故障位置的技术和系统。 该技术和系统包括用于确定接地故障电压的步骤或组件，接收与电负载相关联的门控信号，将接地故障电压与门控制信号进行比较，以及确定接地故障是否位于电负载 关于接地故障电压与门控信号的比较。
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公开(公告)号：US11811344B2
公开(公告)日：2023-11-07
申请号：US17132076
申请日：2020-12-23
Applicant: Caterpillar Inc.
Inventor： Jesse R. Gerdes , Thomas M. Sopko , Carlos E. Nino Baron , Jackson Wai , Ahmed Khalil , Sajan Abdul , Amara Ashfaq , James Michael Thorne
CPC classification number: H02P23/30 , E02F9/207 , E02F3/7609 , E02F3/841 , E02F9/02
Abstract: A work machine includes a frame, a traction system supporting the frame, a power source mounted on the frame, a switched reluctance motor, an inverter configured to control power to the motor from a power source, and a controller. The controller is configured to receive a signal indicating a desired torque and determine if the desired torque is between an upper threshold and a lower threshold. If the desired torque is between the upper threshold and the lower threshold, pulse width modulation is used to produce a PWM adjusted torque command, and the motor is commanded based on the PWM adjusted torque command. The PWM adjusted torque command is configured to cycle between the upper threshold and the lower threshold to produce the desired torque.
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