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

IPC: H02P23/30 ,  E02F9/20

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.

公开(公告)号：US10938332B1

公开(公告)日：2021-03-02

申请号：US16594797

申请日：2019-10-07

Applicant: Caterpillar Inc.

Inventor： Ahmed Khalil ,  James Thorne ,  Jackson Wai ,  Amara Ashfaq ,  Jesse Gerdes

IPC: H02P25/08 ,  H02P25/092 ,  H02P23/14 ,  H02P25/089 ,  H02P9/00

Abstract: A control system that includes a converter circuit and a control device is disclosed. The converter circuit may be configured to control a phase current of a switched reluctance machine. The control device may be configured to determine an estimated flux based on a bus voltage, a phase voltage, and a mutual voltage. The control device may be configured to determine a flux threshold based on the phase current, and determine a first limit and a second limit relative to the flux threshold. The first limit and the second limit may be scaled relative to the flux threshold based on one or more of the target speed, the load demand, or the bus voltage. The control device may be configured to compare the estimated flux with the first limit, and reset the estimated flux to the second limit based on determining that the estimated flux satisfies the first limit.

公开(公告)号：US10476421B1

公开(公告)日：2019-11-12

申请号：US16115148

申请日：2018-08-28

Applicant: Caterpillar Inc.

Inventor： Ahmed Khalil ,  Carlos Nino Baron ,  Chad Brewer ,  Jackson Wai ,  Yash Bhatia

IPC: H02P23/00 ,  H02P25/08 ,  H02P6/17 ,  H02P25/092 ,  H02P6/08

Abstract: A device may select an operation mode based on at least one of a motor speed, a motor transient speed, or a motor power command value. The operation mode may be selected from a group of operation modes including a single pulse mode, a continuous conduction mode, and a variable dwell continuous conduction mode. The device may control a switched reluctance motor using the operation mode.

公开(公告)号：US20160087570A1

公开(公告)日：2016-03-24

申请号：US14492988

申请日：2014-09-22

Applicant: Caterpillar Inc.

Inventor： Jackson Wai ,  Carlos Nino Baron ,  Jesse Gerdes ,  Ahmed Khalil

IPC: H02P25/08

CPC classification number: H02P25/08 ,  B60L15/007 ,  B60L2200/36 ,  B60L2200/40 ,  B60L2220/18 ,  B60L2240/421 ,  B60L2240/423 ,  B60L2240/526 ,  H02P25/083 ,  Y02T10/644 ,  Y02T10/645 ,  Y02T10/7258 ,  Y02T90/16

Abstract: A control system for a switched reluctance (SR) machine is disclosed. The SR machine may have a rotor and a stator. The control system may have a converter circuit operatively coupled to the stator and including a plurality of gates in selective communication with each phase of the stator, and a controller in communication with each of the stator and the converter circuit. The controller may be configured to command a fixed dwell of a theta-on angle and a theta-off angle and a varying current command to the plurality of gates when the SR machine is in a continuous conduction mode.

Abstract translation: 公开了一种用于开关磁阻（SR）机器的控制系统。 SR机器可以具有转子和定子。 控制系统可以具有可操作地耦合到定子并且包括与定子的每个相位选择性地连通的多个栅极的转换器电路以及与每个定子和转换器电路连通的控制器。 控制器可以被配置为当SR机器处于连续导通模式时，将θ-on角度和θ-off角度以及变化电流指令的固定驻留命令给多个门。

公开(公告)号：US20150318806A1

公开(公告)日：2015-11-05

申请号：US14266110

申请日：2014-04-30

Applicant: CATERPILLAR INC

Inventor： Jackson Wai ,  Carlos Nino Baron ,  Jesse Gerdes ,  Ernesto Inoa ,  Ahmed Khalil

IPC: H02P6/10

CPC classification number: H02P25/098 ,  B62D5/046 ,  H02K29/08 ,  H02P6/10 ,  H02P6/14 ,  Y02T10/7258

Abstract: A method of controlling an electric motor may include determining a desired torque at the electric motor. A current at a first phase of the electric motor may be calculated at a controller. The calculated current may be a current that results in supplying the desired torque at the electric motor. The controller may compare the calculated current to a predetermined threshold current, and when the calculated current is greater than the predetermined threshold current, the controller may reduce the calculated current to the predetermined threshold current and adjust a current in a second phase adjacent to the first phase of the electric motor to continue to supply the desired torque at the electric motor.

Abstract translation: 控制电动机的方法可以包括确定电动机的期望转矩。 可以在控制器处计算电动机的第一阶段的电流。 计算出的电流可以是导致在电动机上提供期望转矩的电流。 控制器可以将计算的电流与预定的阈值电流进行比较，并且当所计算的电流大于预定的阈值电流时，控制器可以将计算出的电流减小到预定的阈值电流，并且调节与第一 电动机的相位继续在电动机上提供期望的转矩。

公开(公告)号：US20150127207A1

公开(公告)日：2015-05-07

申请号：US14596387

申请日：2015-01-14

Applicant: Caterpillar Inc.

Inventor： Jackson Wai ,  Thuong Le ,  Adam Braun ,  Jesse Gerdes ,  James Siegle ,  Mark Hartman

IPC: B60L11/02

CPC classification number: B60L11/02 ,  B60K6/46 ,  B60L11/08 ,  B60L15/20 ,  B60W10/08 ,  B60W2050/0075 ,  B60W2300/17 ,  B60W2300/44 ,  B60W2510/0638 ,  E02F9/2075 ,  F02B63/042 ,  F02D29/06 ,  Y02T10/6217 ,  Y02T10/645 ,  Y02T10/70 ,  Y02T10/7077 ,  Y02T10/7275 ,  Y02T90/16 ,  Y10S903/902

Abstract: A control system for a generator of an electric drive is provided. The control system may include a converter circuit configured to communicate with one or more phases of a stator of the generator, and a controller in communication with the converter circuit and an engine associated with the electric drive. The controller may be configured to determine an operational state of the electric drive based on at least engine speed, and engage one of a map-lookup control scheme and a fixed-theta off control scheme for operating the generator based on the operational state of the electric drive.

Abstract translation: 提供一种用于电驱动发电机的控制系统。 控制系统可以包括被配置为与发电机的定子的一个或多个相位通信的转换器电路，以及与转换器电路和与电驱动器相关联的发动机通信的控制器。 控制器可以被配置为基于至少发动机速度来确定电动驱动器的操作状态，并且基于地图查找控制方案和固定关闭控制方案中的一个来操作发电机，所述方法基于操作状态 电驱动。

公开(公告)号：US20250096692A1

公开(公告)日：2025-03-20

申请号：US18368738

申请日：2023-09-15

Applicant: Caterpillar Inc.

Inventor： Jyothiraditya Ramaswamy ,  Karthik Desingu ,  Jackson Wai ,  Ahmed Khalil ,  Jean Marcos Lobo da Fonseca

IPC: H02M3/335 ,  H02M1/088

Abstract: Capacitor voltage balancing techniques are described for a 3-level 3-level dual-active-bridge converter that controls the duration of a zero voltage state of the low voltage (LV) and medium (MV) side transformer voltages based on a voltage difference between the upper and lower capacitors of both the LV and MV sides independently, the power delivered (P), and the LV and MV DC voltages. This control varies the angle to maintain the power requirement, which induces the additional voltage drop across the transformer inductance to produce the required current to flow through the capacitors and balance the capacitor voltages.

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.

公开(公告)号：US20200067422A1

公开(公告)日：2020-02-27

申请号：US16109277

申请日：2018-08-22

Applicant: Caterpillar Inc.

Inventor： Ahmed Khalil ,  Jackson Wai ,  Jesse Gerdes ,  James Thorne ,  Amir Saad

IPC: H02M7/537 ,  H02P27/06

Abstract: An electrical inverter may include a plurality of phase modules to provide a plurality of phase outputs. Two or more of the plurality of phase modules may share a common insulated-gate bipolar transistor.

公开(公告)号：US10079566B1

公开(公告)日：2018-09-18

申请号：US15649778

申请日：2017-07-14

Applicant: Caterpillar Inc.

Inventor： Ahmed Khalil ,  Seok-Hee Han ,  Jackson Wai ,  James Michael Thorne ,  Jesse Gerdes ,  Sangameshwar Sonth

IPC: H02P6/00 ,  H02P25/08 ,  H02P6/18

CPC classification number: H02P25/08 ,  H02P6/18 ,  H02P6/183

Abstract: A system and method for estimating a position and a speed of a rotor of a Switched Reluctance (SR) machine is provided. The SR machine comprises the rotor, a stator and at least one winding. The method includes generating a diagnostic pulse having a trapezoidal shape. The method further includes injecting a diagnostic pulse into the at least one winding of the SR machine. The method further includes measuring an actual stator current flowing through the at least one winding of the SR machine. The method further includes computing an estimated stator current flowing through the at least one winding using observer-based estimation technique. The estimated stator current is compared with the actual stator current to compute an error signal. At least one of the position and the speed of the rotor is estimated based on the error signal.