System and method employing wireless high-voltage interlocking loop using RFID-enabled electrical connectors containing conductive material
11256888 · 2022-02-22
Assignee
Inventors
Cpc classification
G06K7/10366
PHYSICS
B60L3/04
PERFORMING OPERATIONS; TRANSPORTING
H01R13/641
ELECTRICITY
International classification
G06K7/10
PHYSICS
H01R13/641
ELECTRICITY
Abstract
The present invention is a wireless HVIL system and method using RFID-enabled Electrical Connector with connector position assurance (“CPA”) features. Each RFID-enabled Electrical Connector has an RFID tag that is only readable after the CPA features of the RFID-enabled Electrical Connector have been fully deployed. If a CPA feature has not been fully deployed, electrically conductive material will obscure the RFID tag so that it cannot be read. At least one RFID reader is distributed so that all of the RFID tags are within its effective range. When system power is cycled on, the at least one RFID reader emits a digital pulse and reads all of the non-obscured RFID tags. If the at least one RFID reader detects all of the expected RFID tags, an HVIL processor will shut an HVIL switch, and power will be supplied to all HV devices.
Claims
1. A wireless HVIL system using RFID-enabled electrical connectors comprised of a plurality of HV devices, each HV device having an RFID-enabled electrical connector; at least one RFID tag reader, each RFID tag reader having an effective range; an HVIL switch; an HVIL processor; and an HV power supply having an RFID-enabled electrical connector; wherein each RFID-enabled electrical connector is comprised of deployable connector position assurance (“CPA”) features; a socket; a plug; and an RFID tag having a unique RFID identifier; wherein the RFID tag is obscured from being read by any of the at least one RFID readers until the CPA features have been properly deployed; wherein all RFID-enabled electrical connectors lie within the effective range of the at least one RFID reader; wherein, upon power being cycled on to the system, the at least one RFID reader sends a digital pulse and reads all of the unique RFID tags that are within range; and wherein the HVIL processor compares all of the unique RFID tags read by the at least one RFID reader with the unique RFID tag identifiers expected to be received from the HV power supply and the plurality of HV devices.
2. The wireless HVIL system using RFID-enabled connectors of claim 1, further comprising a non-transitory, computer-readable HVIL memory element; wherein the unique RFID identifier associated with each of the HV power supply and the plurality of HV devices is stored on the non-transitory, computer-readable HVIL memory element as a list.
3. The wireless HVIL system using RFID-enabled connectors of claim 2, wherein the HVIL processor compares all of the unique RFID tags read by the at least one RFID reader with the unique RFID tag identifiers expected to be received from the HV power supply and the plurality of HV devices, by matching one-to-one, the unique RFID tags read by the at least one RFID reader with the list stored on the non-transitory, computer-readable HVIL memory element.
4. The wireless HVIL system using RFID-enabled electrical connectors of claim 3 further comprising, for each of the RFID-enabled electrical connectors contained within the system, a connector housing, connected to the plug, and a socket housing connected to the socket; wherein the RFID tag is affixed to the connector housing; wherein the connector housing is capable of being inserted into the socket in such a way as to fully deploy all of the CPA features and creating an electrical connection between the plug and the socket; and wherein the socket housing is fabricated from an electrically conductive material, so that when the CPA features have not been fully deployed, the electrically conductive material obscures the RFID tag affixed to the connector housing of the plug from the first RFID reader.
5. The wireless HVIL system using RFID-enabled electrical connectors of claim 3, wherein, for each of the RFID-enabled electrical connectors contained within the system, the RFID tag is passive, meaning that the RFID tags rely on the fields generated by the digital pulses of the at least one RFID readers in order to be energized because the RFID tag has no independent power source.
6. The wireless HVIL system using RFID-enabled electrical connectors of claim 5, wherein, for each of the RFID-enabled electrical connectors contained within the system, when the CPA feature have not been properly deployed, the RFID tag is obscured from being read by the first RFID reader by an electrically conductive material that shields the RFID tag from being energized and read by any of the at least one RFID readers.
7. The wireless HVIL system using RFID-enabled electrical connectors of claim 6, wherein the electrically conductive material is an electrically conductive polymer.
8. The wireless HVIL system using RFID-enabled electrical connectors of claim 7, wherein, when the HVIL processor detects that the at least one RFID readers have read every unique RFID identifier stored in the non-transitory, computer-readable HVIL memory element, the HVIL processor closes the HVIL switch.
9. The wireless HVIL system using RFID-enabled electrical connectors of claim 8, wherein, when the HVIL processor closes the HVIL switch, the HV power supply delivers power to each of the plurality of HV devices.
10. The wireless HVIL system using RFID-enabled electrical connectors of claim 7, wherein, when the HVIL processor fails to detect that the at least one RFID readers have read every unique RFID identifier stored in the non-transitory, computer-readable HVIL memory element, the HVIL processor will make an additional attempt to detect that the at least one RFID readers have read every unique RFID identifier stored in the non-transitory, computer-readable HVIL memory element, provided that the total number of attempts since the power was cycled remains at or below a pre-defined threshold.
11. The wireless HVIL system using RFID-enabled electrical connectors of claim 10, wherein, when, during an additional attempt, the HVIL processor confirms that the RFID reader has read every unique RFID identifier stored in the non-transitory, computer-readable HVIL memory element, the HVIL processor closes the HVIL switch.
12. The wireless HVIL system using RFID-enabled electrical connectors of claim 11, wherein, when the HVIL processor closes the HVIL switch, the HV power supply delivers power to each of the plurality of HV devices.
13. The wireless HVIL system using RFID-enabled electrical connectors of claim 10, wherein, when an additional attempt would cause the HVIL processor to surpass the pre-defined threshold, the HVIL processor sends an error message.
14. The wireless HVIL system using RFID-enabled electrical connectors of claim 13, wherein the error message displays the name of every HV device for which the at least one RFID readers failed to receive the unique RFID identifier.
15. The wireless HVIL system using RFID-enabled electrical connectors of claim 7, wherein the HVIL processor, the non-transitory, computer-readable HVIL memory element, the HVIL switch, and a first RFID reader are embedded in the HV power supply.
16. The wireless HVIL system using RFID-enabled electrical connectors of claim 7, wherein the HVIL processor, the non-transitory, computer-readable HVIL memory element, the HVIL switch, and a first RFID reader are contained in an HVIL control box.
17. The wireless HVIL system using RFID-enabled electrical connectors of claim 16, wherein the HVIL control box further comprises an active RFID tag with a unique identifier.
18. The wireless HVIL system using RFID-enabled electrical connectors of claim 17, wherein the HV power supply further comprises a second RFID reader, a power switch, and a power supply processor.
19. The wireless HVIL system using RFID-enabled electrical connectors of claim 18, wherein, when the HVIL processor detects that the first RFID reader has read every unique RFID identifier stored in the non-transitory, computer-readable HVIL memory element, the HVIL processor closes the HVIL switch, causing the active RFID tag in the HVIL control box to transmit.
20. The wireless HVIL system using RFID-enabled electrical connectors of claim 19, wherein, when the second RFID reader detects the unique RFID tag from the HVIL control box, the power supply processor closes the power supply switch, causing the HV power supply to deliver power to each of the plurality of HV devices.
21. The wireless HVIL system using RFID-enabled electrical connectors of claim 18, wherein, when the HVIL processor fails to detect that the first RFID reader has read every unique RFID identifier stored in the non-transitory, computer-readable HVIL memory element, the HVIL processor will make an additional attempt to detect that the first RFID reader has read every unique RFID identifier stored in the non-transitory, computer-readable HVIL memory element, provided that the total number of attempts since the power was cycled remains at or below a pre-defined threshold.
22. The wireless HVIL system using RFID-enabled electrical connectors of claim 21, wherein, when, during an additional attempt, the HVIL processor confirms that the first RFID reader has read every unique RFID identifier stored in the non-transitory, computer-readable HVIL memory element, the HVIL processor closes the HVIL switch, causing the RFID tag in the HVIL control box to transmit.
23. The wireless HVIL system using RFID-enabled electrical connectors of claim 22, wherein, when the second RFID reader detects the unique RFID tag from the HVIL control box, the power supply processor closes the power supply switch, causing the HV power supply to deliver power to each of the plurality of HV devices.
24. The wireless HVIL system using RFID-enabled electrical connectors of claim 21, wherein, when an additional attempt would cause the HVIL processor to surpass the pre-defined threshold, the HVIL processor sends an error message.
25. The wireless HVIL system using RFID-enabled electrical connectors of claim 24, wherein the error message displays the name of every HV device for the first RFID reader failed to receive the unique RFID identifier.
26. A method for implementing a wireless HVIL comprising the steps of assembling a high-voltage system containing a HV power supply and a plurality of HV devices; assigning the HV power supply and each of a plurality of HV devices with its own unique identifier embodied on an RFID tag; creating a list of all unique identifiers embodied on an RFID tag; storing the list on a non-transitory, computer readable memory element; embedding the RFID tag of the HV power supply and of each of the plurality of HV devices in an electrical connector having a socket and a plug, wherein the electrical connector has CPA features designed so that the RFID tag is obscured by conductive material when the CPA features have not been fully deployed; cycling power on; detecting all non-obscured RFID tags using at least one RFID reader; and comparing the list of all unique identifiers with all of the non-obscured RFID tags detected by the at least one RFID reader.
27. The method for implementing a wireless HVIL of claim 26, further comprising the steps of determining that all of the unique identifiers contained in the list have been detected by the at least one RFID reader; and closing an HVIL switch.
28. The method for implementing a wireless HVIL of claim 27, further comprising the step of supplying HV power from the HV power supply to each of the plurality of HV devices.
29. The method for implementing a wireless HVIL of claim 27, further comprising the steps of transmitting an additional unique identifier contained on an additional RFID tag as the result of closing the HVIL switch; detecting the unique identifier of the additional RFID tag using an RFID reader; closing a power supply switch; and supplying HV power from the HV power supply to each of the plurality of HV devices.
30. The method for implementing a wireless HVIL of claim 26, further comprising the step of determining that all of the unique identifiers contained in the list have not been detected by the first RFID reader.
31. The method for implementing a wireless HVIL of claim 30, further comprising the steps of making an additional attempt to detect all of the non-obscured RFID tags, provided that the total number of attempts does not exceed a pre-defined threshold.
32. The method for implementing a wireless HVIL of claim 31, further comprising the steps of determining that all of the unique identifiers contained in the list have now been detected by the at least one RFID reader; closing an HVIL switch; and supplying HV power from the HV power supply to each of the plurality of HV devices.
33. The method for implementing a wireless HVIL of claim 30, further comprising the steps of determining that the number of attempts made has exceeded the pre-defined threshold; transmitting an error message; displaying the names of each of the HV power supply and plurality of HV devices; and highlighting on the display the names for which the RFID tag was obscured.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The present invention is illustrated with 14 drawings on 11 sheets.
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DETAILED DESCRIPTION OF THE DRAWINGS
(16) The following descriptions are not meant to limit the invention, but rather to add to the summary of invention, and illustrate the present invention, by offering and illustrating various embodiments of the present invention, a system and method for a wireless HVIL 601 using RFID-enabled Electrical Connectors 1. While embodiments of the invention are illustrated and described, the embodiments herein do not represent all possible forms of the invention. Rather, the descriptions, illustrations, and embodiments are intended to teach and inform one skilled in the art without limiting the scope of the invention.
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(18) The HVIL 101 is not the power distribution for the system, meaning it is not delivering HV power to each of the plurality of HV devices and the HV motor. To be clear, the HV motor 125 is an HV device 120. Rather, it is a separate wired loop 130 intended to detect if any of the HV components has a faulty connection.
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(21) Before explaining the overall wireless HVIL system 601 of the present invention 601, it is necessary to disclose and teach one of its core components, an RFID-enabled Electrical Connector 1. The overall system 601 uses a plurality of the RFID-enabled Electrical Connectors 1. The RFID-enabled Electrical Connectors 1 use a conductive material; preferably, the conductive material is a conductive polymer.
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(23) The socket 31 has a number of CPA features: a latch 11, a release 16, a first lock indicator tabs 60, a second lock indicator tabs 50, a CPA lock tab 41, and a visual indicator 10. The socket 31 also has a mating ridge 32 to accept a portion of the ridge 33 on the connector housing 13. The socket 31 has a base 12 that interfaces with a circuit-board 2, or a similar electrical interface.
(24) The connector housing 13 is mated with the plug 14. The connector housing 13 is then inserted into the socket 31. The direction of insertion is indicated 10. The connector housing 13 encounters resistance when it hits the first lock indicator tab 60, indicating that there is an internal locking tab that the insertion force must overcome. The connector housing 13 then encounters resistance when it hits the second lock indicator tab 50, indicating that there is a second internal locking tab that the insertion force must overcome. When the connector housing 13 is fully inserted into the socket 31, the latch is exposed 11. A ridge 33 on the connector housing 13 also acts as a stop. The ridge 33 also acts as a guide that inserts in a mating ridge 32 on the socket housing 100.
(25) Once the connector housing 13 is fully inserted into the socket 31, the latch must be pressed, which causes the connector housing 13 to retract slightly with respect to the socket 31. This means that the CPA features 11, 16, 60, 50, 41, and 10 have been properly deployed. The connector housing 13 is positionally locked with respect to the socket 31 when the CPA features 11, 16, 60, 50, 41, and 10 have been properly deployed. In the fully inserted position, prior to the latch 11 being pressed, the connector housing 13 is not positionally locked with respect to the socket 31. In other words, the CPA features 11, 16, 60, 50, 41, and 10 have not properly deployed. In the fully inserted position, prior to the latch 11 being pressed, the connector housing 13 is in full electrical contact with the socket 31, which is the state that allows the latch 11 to be exposed. Of course, CPA connector systems can be accomplished with variations of the above. The problem with current CPA connector systems is that there is no way to assure that the CPA features 11, 16, 60, 50, 41, and 10 have been properly deployed and that the connector housing 13 is positionally locked with respect to the socket 31.
(26) The present invention 1 builds on the prior art by adding an RFID tag 20, which can be read by an RFID reader only when the CPA features 11, 16, 60, 50, 41, and 10 have been properly deployed and that the connector housing 13 is positionally locked with respect to the socket 31. An RFID tag 20 is typically a three-dimensional right rectangle with six sides. The RFID tag 20 is affixed in some manner to one of the components of the RFID-enabled electrical connector 1. In this embodiment, a passive RFID tag 20 is shown in
(27) Depending on the frequencies used by the RFID tag 20 and the field strength of the RFID reader, leakage is possible. In order to prevent stray leakage, potentially resulting in a false reading, the connector housing 13 may also be fabricated from an electrically conductive material, such an electrically conductive polymer. The conductive materials can also be metalized plastic, in which metal foils are embedded in certain features of the connector during the molding process. In an alternative embodiment, the connector housing 13 can be fabricated from traditional connector housing polymers, and just the ridge 33 can be formed from an electrically conductive material, such as an electrically conductive polymer. In this embodiment, the ridge 33 formed from an electrically conductive polymer surrounds the RFID tag 20 on five sides. Only the top surface of the RFID tag 20 is exposed. Functionally, the RFID tag 20 is in a five-sided box constructed within the ridge 33. As a further embodiment to the present invention 1, the RFID tag 20 may be contained in a dedicated five-sided box fabricated from electrically conductive polymer.
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(29) The connector housing 113 is made from an electrically conductive material, such as an electrically conductive polymer. The connector housing 113 has an RFID window 170. There is a void 220 in the center of the RFID window 170. When the socket 131 is properly seated in the connector housing 113, and the CPA latch 111 has been depressed (compare
(30) In
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(33) However, this wireless loop 630 is illustrative on one alternative embodiment. The RFID readers 690 can be distributed to each HV device in the system 110, 610, 120, 125. The distributed RFID readers 690 would then be wirelessly daisy-chained with RFID tags 620. This means that the RFID readers 690 can be distributed to the HV devices as a wireless serial connection, requiring each RFID reader 690 to detect the RFID tag 620 that precedes it in the chain 630.
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(35) When the vehicle ignition 399 is cycled on, the power 350 to the HVIL Control box 610 is cycled on. The RFID reader 690 emits a digital pulse and detects the unique RFID identifier 620A, 620B, 620C from each of a plurality of HV devices 120A, 120B, 120C. As discussed in conjunction with
(36) If the RFID reader 690 fails to detect one or more of the unique RFID identifiers 620A, 620B, 620C, the processor 320 can direct the RFID reader 690 to emit an additional digital pulse and attempt to detect all of the unique RFID identifiers again. The processor 320 again compares the RFID identifiers 620A, 620B, 620C detected by the RFID reader 690 with the RFID identifiers stored in the list on the non-transitory computer-readable HVIL memory element 330. If all of the unique RFID identifiers 620A, 620B, 620C are detected, the processor 320 closes the HVIL switch 121 indicating to the power supply 110 to close the system switch 621, energizing the HV power circuit. This process can be repeated until the number of attempts reaches a pre-defined threshold, at which point the processor sends an error message 360 to the display 310. The error message 360 can indicate in which of the plurality of HV devices 120A, 120B, 120C the fault was detected. This would of course be the HV device or devices 120A, 120B, 120C for which the RFID reader 690 was unable to read the unique RFID identifiers 620A, 620B, 620C.
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(38) The integrated HV power supply and wireless HVIL control box 610 is comprised of a power supply 110 with a system switch 621; and a wireless HVIL control box 610. The wireless HVIL control box 610 has an RFID tag 620, RFID reader 690, and HVIL switch 121. In
(39) When the vehicle ignition 399 is cycled on, the power 350 to the HVIL Control box 610 is cycled on. The RFID reader 690 emits a digital pulse and detects the unique RFID identifier 620A, 620B, 620C from each of a plurality of HV devices 120A, 120B, 120C. As discussed in conjunction with
(40) If the RFID reader 690 fails to detect one or more of the unique RFID identifiers 620A, 620B, 620C, the processor 320 can direct the RFID reader 690 to emit an additional digital pulse and attempt to detect all of the unique RFID identifiers again. The processor 320 again compares the RFID identifiers 620A, 620B, 620C detected by the RFID reader 690 with the RFID identifiers stored in the list on the non-transitory computer-readable HVIL memory element 330. If all of the unique RFID identifiers 620A, 620B, 620C are detected, the processor 320 closes the HVIL switch 121 indicating to the power supply 110 to close the system switch 621, energizing the HV power circuit. This process can be repeated until the number of attempts reaches a pre-defined threshold, at which point the processor sends an error message 360 to the display 310. The error message 360 can indicate in which of the plurality of HV devices 120A, 120B, 120C the fault was detected. This would of course be the HV device or devices 120A, 120B, 120C for which the RFID reader 690 was unable to read the unique RFID identifiers 620A, 620B, 620C. So, in other words, the method of the invention does not depend on the configuration used for the HVIL control box 610 functionality.