公开(公告)号：WO2015105642A1

公开(公告)日：2015-07-16

申请号：PCT/US2014/070527

申请日：2014-12-16

Applicant: CATERPILLAR INC.

Inventor： CROSMAN, Alexander C., III ,  INOA, Ernesto ,  GERDES, Jesse R.

IPC: G01R31/08

CPC classification number: G01R31/025 ,  G01R31/086 ,  G01R31/343

Abstract: A technique (80) and system (24) for detecting a location of a ground fault in an electrical system (22) are provided. The technique (80) and system (24) include steps or components for determining a ground fault voltage, receiving a gate control signal (48) associated with an electric load (28), comparing the ground fault voltage to the gate control signal (48), and determining whether the ground fault is located at the electric load (28) based on the comparison of the ground fault voltage to the gate control signal (48).

Abstract translation: 提供了用于检测电气系统（22）中的接地故障的位置的技术（80）和系统（24）。 技术（80）和系统（24）包括用于确定接地故障电压的步骤或部件，接收与电负载（28）相关联的门控制信号（48），将接地故障电压与门控制信号（48 ），并且基于所述接地故障电压与所述门控制信号（48）的比较来确定所述接地故障是否位于所述电负载（28）。

公开(公告)号：WO2022140101A1

公开(公告)日：2022-06-30

申请号：PCT/US2021/063175

申请日：2021-12-14

Applicant: CATERPILLAR INC.

Inventor： GERDES, Jesse R. ,  WAI, Jackson ,  KHALIL, Ahmed ,  THOME, James Michael ,  ABDUL, Sajan ,  ASHFAQ, Amara

IPC: H02P6/185 ,  H02P25/089

Abstract: A system (102) and method for torque compensation in a switched reluctance (SR) machine (104) disposed on a machine (100) is disclosed. The system (102) may comprise a SR machine (104), an inverter (122) and a controller (124). The controller (124) is in operable communication with the inverter (122) and is configured to determine a commanded main current associated with energization by a main current (138) of a first portion of the plurality of windings (130) for a controlling phase (132), and determine a commanded parasitic current associated with energization by a parasitic current (140) of a second portion of the windings (130) in a non-controlling phase (134). The controller (124) is further configured to determine an offset current (142) based on the commanded parasitic current, and determine a target current (136) based on a first sum of the commanded main current and the offset current (142), and command the inverter (122) to actuate the target current (136) in the first portion of the windings (130) during the controlling phase (132).

公开(公告)号：WO2022140102A1

公开(公告)日：2022-06-30

申请号：PCT/US2021/063177

申请日：2021-12-14

Applicant: CATERPILLAR INC.

Inventor： GERDES, Jesse R. ,  SOPKO, Thomas M. ,  NINO BARON, Carlos E. ,  WAI, Jackson ,  KHALIL, Ahmed ,  ABDUL, Sajan ,  ASHFAQ, Amara ,  THORNE, James Michael

IPC: B60L15/08 ,  B60L50/10 ,  B60L50/51 ,  B60L50/60 ,  B60L50/61 ,  H02P6/185 ,  H02P25/089 ,  H02P21/13 ,  H02P21/12

Abstract: A work machine (100) includes a frame (110), a traction system (120) supporting the frame (110), a power source (130) mounted on the frame (110), a switched reluctance motor (205), an inverter (220) configured to control power to the motor (205) from a power source (130), and a controller (210). The controller (210) is configured to receive a signal indicating a desired torque (430) and determine if the desired torque (430) is between an upper threshold (410) and a lower threshold (420). If the desired torque (430) is between the upper threshold (410) and the lower threshold (420), pulse width modulation is used to produce a PWM adjusted torque command (450), and the motor (205) is commanded based on the PWM adjusted torque command (450). The PWM adjusted torque command (450) is configured to cycle between the upper threshold (410) and the lower threshold (420) to produce the desired torque (430).