Patents by Inventor Shailesh N. Joshi

Shailesh N. Joshi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11220426
    Abstract: A method for forming a flow channel in a MIO structure includes positioning a plurality of sacrificial spheres along a base substrate, heating a region of the plurality of sacrificial spheres above a melting point of the plurality of sacrificial spheres, thereby fusing the plurality of sacrificial spheres together and forming a solid channel, electrodepositing material between the plurality of sacrificial spheres and around the solid channel, removing the plurality of sacrificial spheres to form the MIO structure, and removing the solid channel to form the flow channel extending through the MIO structure.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: January 11, 2022
    Assignees: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Shailesh N. Joshi, Paul Braun, Julia Kohanek, Gaurav Singhal
  • Publication number: 20210381110
    Abstract: A transient liquid phase (TLP) composition includes a plurality of first high melting temperature (HMT) particles, a plurality of second HMT particles, and a plurality of low melting temperature (LMT) particles. Each of the plurality of first HMT particles have a core-shell structure with a core formed from a first high HMT material and a shell formed from a second HMT material that is different than the first HMT material. The plurality of second HMT particles are formed from a third HMT material that is different than the second HMT material and the plurality of LMT particles are formed from a LMT material. The LMT particles have a melting temperature less than a TLP sintering temperature of the TLP composition and the first, second, and third HMT materials have a melting point greater than the TLP sintering temperature.
    Type: Application
    Filed: August 25, 2021
    Publication date: December 9, 2021
    Applicant: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Yanghe Liu
  • Patent number: 11193913
    Abstract: A method of detecting sub-surface voids in a sample comprises positioning a probe adjacent to a first point on the sample, emitting an ultrasonic wave from the probe towards the sample, moving the probe towards the sample, measuring a shear force amplitude of a reflection of the ultrasonic wave at the probe as the probe moves towards the sample, creating an approach curve by plotting the measured shear force amplitude of the reflection of the ultrasonic wave as a function of a distance between the probe and the sample, and determining whether a sub-surface void exists at the first point on the sample based on a slope of the approach curve.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: December 7, 2021
    Assignees: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., THE OHIO STATE UNIVERSITY
    Inventors: Shailesh N. Joshi, Vishnu Baba Sundaresan, Vijay Venkatesh
  • Publication number: 20210368652
    Abstract: In various embodiments, a cooling assembly includes a heat-generating device, a metal inverse opal (MIO) layer, a shared coolant reservoir, a passive heat exchange circuit, and an active heat exchange circuit. The MIO layer is bonded to the heat-generating device. The shared coolant reservoir contains a coolant fluid. The passive heat exchange circuit directs coolant fluid from the shared coolant reservoir through the MIO layer and back to the shared coolant reservoir. The active heat exchange circuit includes a pump and a heat exchanger, wherein the active heat exchange circuit draws the coolant fluid from the shared coolant reservoir through the heat exchanger and returns the coolant fluid to the shared coolant reservoir.
    Type: Application
    Filed: May 21, 2020
    Publication date: November 25, 2021
    Applicant: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Shailesh N. Joshi, Danny J. Lohan
  • Publication number: 20210341911
    Abstract: A method, system, and non-transitory computer readable medium describing an autoencoder that creates a reduced feature space from healthy power electronics devices for training. Devices under test are then encoded and compared to the encoded features of the healthy devices to determine health of the other devices. Contextual information is used to build multiple models that compare power electronics devices from similarly operated vehicles with one another.
    Type: Application
    Filed: May 4, 2020
    Publication date: November 4, 2021
    Applicants: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., UNIVERSITY OF CONNECTICUT
    Inventors: Shailesh N. JOSHI, Donald MCMENEMY, John KAMINSKI, Ravi RAJAMANI, Muhamed FAROOQ, Krishna PATTIPATI, Ali BAZZI
  • Patent number: 11153996
    Abstract: An electronic assembly includes a PCB disposed on an end-face of a motor proximate to a first surface thereof and a thermal management assembly (TMA) thermally connected to the PCB. One or more switching semiconductor devices are disposed on the first surface. The TMA includes a cooling jacket disposed around a circumference of the motor, at least one jacket manifold formed through the cooling jacket, a thermal compensation base layer thermally coupled to the cooling jacket and the one or more switching semiconductor devices, and a cooling manifold disposed through the PCB to form a fluid flow path therethrough. The at least one jacket manifold has a fluid inlet and a fluid outlet. Two or more electrically insulated posts, each having a cooling channel, are disposed between the at least one jacket manifold and the cooling manifold and form a fluid circuit between the fluid inlet and the fluid outlet.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: October 19, 2021
    Assignee: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Shailesh N. Joshi, Shohei Suenaga
  • Publication number: 20210302106
    Abstract: A thermal compensation layer includes a metal inverse opal (MIO) layer that includes a plurality of core-shell phase change (PC) particles encapsulated within a metal of the MIO layer. Each of the core-shell PC particles includes a core that includes a PCM having a PC temperature in a range of from 100° C. to 250° C., and a shell that includes a shell material having a melt temperature greater than the PC temperature of the PCM. A power electronics assembly includes a substrate having a thermal compensation layer formed proximate a surface of the substrate, the thermal compensation layer comprising an MIO layer that includes a plurality of core-shell PC particles encapsulated within a metal of the MIO layer. The power electronics assembly further includes an electronic device bonded to the thermal compensation layer at a first surface of the electronic device.
    Type: Application
    Filed: June 11, 2021
    Publication date: September 30, 2021
    Applicant: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Ercan Mehmet Dede
  • Patent number: 11125248
    Abstract: Fan performance can be adjusted based on real-time operating conditions. The fan can include a plurality of blades operatively connected to a rotor. The blades can extend radially outward from the rotor to a tip. A housing can substantially surround the fan. The housing can have an inner peripheral surface that defines an inner diameter. The inner peripheral surface can include a first portion and a second portion downstream of the first portion. The first portion can be adjacently upstream of the plurality of blades, and the second portion can be substantially aligned with the plurality of blades. A plurality of actuators being distributed in a circumferential direction of the housing. The actuators can be operatively positioned to cause the inner diameter of the first portion or the second portion to be altered. As a result, one or more performance characteristics of the fan can be changed.
    Type: Grant
    Filed: April 4, 2019
    Date of Patent: September 21, 2021
    Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Ercan Mehmet Dede, Umesh N. Gandhi
  • Publication number: 20210288555
    Abstract: An integrated power control assembly configured as an inverter for a motor is mounted directly on an axial end of the motor. The integrated power control assembly includes one or more power plates, one or more cooling plates coaxially disposed on and thermally connected to the one or more power plates, and one or more circuit boards circumferentially disposed around the one or more power plates. An individual power plate has a power card having one or more switching semiconductor devices corresponding to individual phases of the motor. The individual power card is electrically coupled to the motor through one or more busbars. An individual circuit board is electrically coupled to an individual power card corresponding to an individual phase of the motor. The individual circuit board has a first surface electrically coupled to the one or more power plates and a second surface opposite to the first surface.
    Type: Application
    Filed: March 13, 2020
    Publication date: September 16, 2021
    Applicant: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Shailesh N. JOSHI, Yanghe LIU, Fa CHEN
  • Patent number: 11121061
    Abstract: Embodiments described herein generally relate to an electronics assembly that includes a semiconductor device, a substrate layer, a first mesh layer and a second mesh layer. Jet channels that have a first inner diameter are disposed within the substrate layer. The first mesh layer includes a first plurality of pores that have a perimeter opening. The second mesh layer includes a second plurality of pores that have a second inner diameter. The jet channels, the first and the second plurality of pores are concentric to create a fluid path for a fluid to impinge a first device surface of the semiconductor device. The second inner diameter is smaller than the perimeter opening and the first inner diameter of the substrate layer such that a cooling fluid velocity increases when flowing from the substrate layer through the second mesh layer.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: September 14, 2021
    Assignee: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Shailesh N. Joshi, Naoya Take
  • Patent number: 11113168
    Abstract: Systems and methods for detecting an anomaly in a power semiconductor device are disclosed. A system includes a server computing device and one or more local components communicatively coupled to the server computing device. Each local component includes sensors positioned adjacent to the power semiconductor device for sensing properties thereof. Each local component receives data corresponding to one or more sensed properties of the power semiconductor device from the sensors and transmits the data to the server computing device. The server computing device utilizes the data, via a machine learning algorithm, to generate a set of eigenvalues and associated eigenvectors and select a selected set of eigenvalues and associated eigenvectors. Each local component conducts a statistical analysis of the selected set of eigenvalues and associated eigenvectors to determine that the data is indicative of the anomaly.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: September 7, 2021
    Assignees: Toyota Motor Engineering & Manufacturing North America, Inc., University of Connecticut
    Inventors: Ercan Mehment Dede, Shailesh N. Joshi, Lingyi Zhang, Weiqiang Chen, Krishna Pattipatti, Ali M. Bazzi
  • Patent number: 11098960
    Abstract: A cooling device includes a substrate defining a substrate upper surface, and a fin positioned on the substrate upper surface, the fin including a deformable encapsulating layer coupled to the substrate upper surface and defining an interior region, and a phase-change material encapsulated within the interior region, where the phase-change material changes from a first matter phase to a second matter phase at a boiling point of a working fluid positioned on the deformable encapsulating layer.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: August 24, 2021
    Assignee: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventor: Shailesh N. Joshi
  • Patent number: 11101193
    Abstract: A power electronics module includes an electrically-conductive substrate including a base portion defining a plurality of orifices that extend through the base portion, the plurality of orifices defining a plurality of jet paths extending along and outward from the plurality of orifices, and a plurality of posts extending outward from the base portion, where individual posts of the plurality of posts are positioned between individual orifices of the plurality of orifices, and a power electronics device coupled to the plurality of posts opposite the base portion, the power electronics device defining a bottom surface that is oriented transverse to the plurality of jet paths.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: August 24, 2021
    Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Naoya Take, Ercan Mehmet Dede
  • Patent number: 11093315
    Abstract: Systems and methods for detecting a fault or model mismatch are disclosed. A system includes a processor, a memory, and one or more sensors. The sensors may detect data associated with an electronic device. The memory may store processor executable instructions to: compute T2 and Q statistics, over a time period, and apply a model mismatch and fault detection logic based on the T2 and Q statistics. The model mismatch and fault detection logic may: count consecutive instances where a T2 statistic exceeds a T2 threshold via a T2 counter, update a probability of fault based on the T2 counter, count consecutive instances where a Q statistic exceeds a Q threshold via a Q counter, update a probability of model mismatch based on the Q counter, and detect one of a fault or a model mismatch based on a probability of fault threshold and a probability of model mismatch threshold.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: August 17, 2021
    Assignees: Toyota Motor Engineering & Manufacturing North America, Inc., University of Connecticut
    Inventors: Donald McMenemy, Weiqiang Chen, Ali M. Bazzi, Krishna R. Pattipati, Shailesh N. Joshi
  • Publication number: 20210238033
    Abstract: A method for forming a flow channel in a MIO structure includes positioning a plurality of sacrificial spheres along a base substrate, heating a region of the plurality of sacrificial spheres above a melting point of the plurality of sacrificial spheres, thereby fusing the plurality of sacrificial spheres together and forming a solid channel, electrodepositing material between the plurality of sacrificial spheres and around the solid channel, removing the plurality of sacrificial spheres to form the MIO structure, and removing the solid channel to form the flow channel extending through the MIO structure.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 5, 2021
    Applicants: Toyota Motor Engineering & Manufacturing North America, Inc, The Board of Trustees of the University of Illinois
    Inventors: Shailesh N. Joshi, Paul Braun, Julia Kohanek, Gaurav Singhal
  • Publication number: 20210238761
    Abstract: Embodiments of the disclosure relate to methods for forming a flat surface MIO structure for bonding and cooling electronic assemblies. In one embodiment, the method includes providing a plurality of particles on a surface of a base substrate. A metal is then deposited onto the plurality of particles up to a desired level to form a metal layer such that the plurality of particles is partially covered by the metal layer. An adhesive member is then applied to the plurality of particles exposed above the metal layer. Finally the adhesive member is pulled to remove individual particles of the plurality of particles that are exposed above the metal layer.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 5, 2021
    Applicants: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Shailesh N. JOSHI, Paul BRAUN, Gaurav Singhal
  • Publication number: 20210239653
    Abstract: A method of detecting sub-surface voids in a sample comprises positioning a probe adjacent to a first point on the sample, emitting an ultrasonic wave from the probe towards the sample, moving the probe towards the sample, measuring a shear force amplitude of a reflection of the ultrasonic wave at the probe as the probe moves towards the sample, creating an approach curve by plotting the measured shear force amplitude of the reflection of the ultrasonic wave as a function of a distance between the probe and the sample, and determining whether a sub-surface void exists at the first point on the sample based on a slope of the approach curve.
    Type: Application
    Filed: January 31, 2020
    Publication date: August 5, 2021
    Applicants: Toyota Motor Engineering & Manufacturing North America, Inc., The Ohio State University
    Inventors: Shailesh N. Joshi, Vishnu Baba Sundaresan, Vijay Venkatesh
  • Patent number: 11067343
    Abstract: A thermal compensation layer includes a metal inverse opal (MIO) layer that includes a plurality of core-shell phase change (PC) particles encapsulated within a metal of the MIO layer. Each of the core-shell PC particles includes a core that includes a PCM having a PC temperature in a range of from 100° C. to 250° C., and a shell that includes a shell material having a melt temperature greater than the PC temperature of the PCM. A power electronics assembly includes a substrate having a thermal compensation layer formed proximate a surface of the substrate, the thermal compensation layer comprising an MIO layer that includes a plurality of core-shell PC particles encapsulated within a metal of the MIO layer. The power electronics assembly further includes an electronic device bonded to the thermal compensation layer at a first surface of the electronic device.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: July 20, 2021
    Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Ercan Mehmet Dede
  • Patent number: 11069594
    Abstract: A method of forming an inverse opal structure along a substrate that includes depositing polymer spheres along the substrate and electroplating the substrate and spheres at a first current density to form a first solid metal layer such that the spheres are raised from the substrate. The method includes electroplating the substrate and the spheres at a second current density to diffuse metals from the substrate and deposit the metal about the spheres. The second current density is greater than the first current density. The method includes electroplating the substrate and spheres to form a second solid metal layer disposed over the spheres, and removing the spheres to form the inverse opal structure disposed between the first and second solid metal layers. The first and second solid metal layers define planar interface surfaces disposed over a porous structure of the inverse opal structure.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: July 20, 2021
    Assignees: Toyota Motor Engineering & Manufacturing North America, Inc., The Board of Trustees of the University of Illinois
    Inventors: Shailesh N. Joshi, Paul Braun, Julia Kohanek, Gaurav Singhal
  • Publication number: 20210216876
    Abstract: Systems and methods of auto-encoder behavior modelling of vehicle components are described herein. A method for electronic device health prediction may include encoding input data into a reduced feature set via an auto-encoder as part of an artificial neural network. The method may further include decoding the reduced feature set. The method may also include reading the reduced feature set as output. The method may still further include encoding features of a subject device and other devices, wherein at least one of the other devices is designated as a healthy device. The method may additionally include associating the features of the other devices with a healthy device cluster based on a threshold distance. The method may also additionally include associating the features of the subject device with the healthy device cluster, wherein the subject device is flagged as faulty based upon exceeding the threshold distance from the healthy device cluster.
    Type: Application
    Filed: January 15, 2020
    Publication date: July 15, 2021
    Applicants: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., UNIVERSITY OF CONNECTICUT
    Inventors: Donald McMenemy, John Kaminski, Shailesh N. Joshi, Ali M. Bazzi, Krishna Pattipati