New energy automobile and relay installation detection device and control method thereof

Abstract

The invention discloses a new energy automobile and a relay installation detection device and a control method thereof, the automobile comprises the relay installation detection device, the relay installation detection device is installed in an integrated controller of the automobile, and the relay installation detection device comprises a circuit board which is sequentially provided with a plurality of receding positioning groove holes used for correspondingly installing relays in the length direction; a plurality of magnetic induction detection chips, wherein one magnetic induction detection chip is arranged corresponding to each receding positioning groove; the input copper bar is positioned below the circuit board and is respectively connected with the circuit board and the input pole piece of the relay; the output copper bar and the input copper bar are oppositely arranged below the circuit board and are respectively connected with the circuit board and the output pole piece of the relay; the circuit board is provided with a group of shielding installation grooves corresponding to each receding positioning groove hole, each group of shielding installation grooves are symmetrically arranged on the two sides of the magnetic induction detection chip respectively, and the shielding sheet penetrates through the shielding installation grooves and wraps the output copper bar between the circuit board and the shielding sheet. The invention further discloses a relay control method of the new energy automobile.

Description

Technical Field

[0001] The invention relates to a new energy vehicle, in particular to a new energy vehicle and a relay installation detection device and a control method thereof. Background Art

[0002] The relay is the connection hub for the high-voltage input and output of new energy vehicles. The output is controlled by closing / opening the control relay. Most of the relays currently used in new energy vehicles are electromagnetic relays. The existing relay control technology is to detect the voltage at the front and rear ends of the relay, and control the on and off of the relay through the voltage difference between the front and rear ends; and the high-voltage connection and voltage detection connection at the front and rear ends of the relay are connected by wiring harnesses. When a large current passes through the electrical circuit where the relay is located, if the relay is disconnected at this time, it is easy to generate an arc at the relay contacts, causing the relay contacts to stick, thereby affecting the life of the relay; the high-voltage connection and voltage detection connection at the front and rear ends of the relay are connected by wiring harnesses. There are many wiring harnesses for installation and connection, and it is not easy to tie and fix them. It is easy to make installation errors, and the processability is poor. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a new energy vehicle and a relay installation detection device and a control method thereof in view of the above-mentioned defects of the prior art.

[0004] In order to achieve the above object, the present invention provides a relay installation detection device, which is installed in an integrated controller of a new energy vehicle and includes:

[0005] A circuit board, wherein a plurality of air-avoiding positioning slots for correspondingly installing relays are sequentially arranged along the length direction of the circuit board;

[0006] A plurality of magnetic induction detection chips, one magnetic induction detection chip is arranged corresponding to each of the air-avoiding positioning slots;

[0007] An input copper busbar is located below the circuit board and is connected to the circuit board and the input pole piece of the relay respectively;

[0008] An output copper busbar is arranged below the circuit board opposite to the input copper busbar and is respectively connected to the circuit board and the output pole piece of the relay; and

[0009] A shielding sheet, wherein a group of shielding installation grooves are arranged on the circuit board corresponding to each of the air-avoiding positioning slots, and each group of the shielding installation grooves are symmetrically arranged on both sides of the magnetic induction detection chip, and the shielding sheet passes through the shielding installation grooves and covers the output copper busbar between the circuit board and the shielding sheet.

[0010] The above-mentioned relay installation detection device, wherein each of the air-avoiding positioning slots is symmetrically provided with screw holes on both sides, and a fastening screw passes through the screw hole on one side to connect the circuit board, the input copper busbar and the input pole piece of the relay; another fastening screw passes through the screw hole on the other side to connect the circuit board, the output copper busbar and the output pole piece of the relay.

[0011] The above-mentioned relay installation detection device, wherein the shielding plate is a rectangular frame structure with an open upper end, the distance between the two side walls of the shielding plate is a spacing W, the spacing W is equal to the distance between each group of the shielding installation grooves, and the spacing W is greater than or equal to the width of the output copper busbar; the spacing W is greater than the width of the magnetic induction detection chip.

[0012] In the above relay installation detection device, the distance H between the magnetic induction detection chip and the top of the shielding sheet is greater than 1 / 2 of the spacing W.

[0013] In the above relay installation detection device, a control signal interface is also provided on the circuit board, and the control signal line of the relay is connected to the control signal interface.

[0014] The above-mentioned relay installation detection device, wherein the control signal interface is arranged corresponding to the shielding installation groove and is respectively located on both sides of the circuit board near the edge; the air avoidance positioning slot is located between the control signal interface and the shielding installation groove.

[0015] The above-mentioned relay installation detection device, wherein the circuit board is a PCB board, and a voltage circuit for connecting the voltage detection signal of the relay is provided on the PCB board. A voltage / current signal interface is also provided on the circuit board, and the voltage detection signal of the relay is connected to the voltage / current signal interface through the voltage circuit.

[0016] In order to better achieve the above object, the present invention also provides a relay control method for a new energy vehicle, wherein the new energy vehicle is equipped with the above relay installation detection device and connected to the integrated controller of the new energy vehicle, and the relay control method comprises the following steps:

[0017] S100, the vehicle control module in the integrated controller sends a relay cut-off instruction to the relay control module;

[0018] S200, the relay control module controls the relay installation detection device to start detecting the loop current value I of the relay, and compares it with the breaking current value b0 of the relay;

[0019] S300, if the loop current value I detected by the magnetic induction detection chip of the relay installation detection device is less than b0, the relay control module issues a relay disconnection instruction; and

[0020] S400: If the detected loop current value I>b0, the relay control module does not issue a relay disconnection instruction; the relay control module can issue a relay disconnection instruction only when the detected loop current value I<b0.

[0021] In the above-mentioned relay control method for new energy vehicles, the breaking current value b0 of each electrical circuit relay is determined by the relay characteristics of this branch, and the loop current value I of this branch is obtained by detection by the magnetic induction detection chip; if the current value I>b0 makes the relay not disconnect for a long time, the fuse installed on this branch will be blown first to protect the safety of the entire branch.

[0022] In order to better achieve the above-mentioned purpose, the present invention also provides a new energy vehicle, which includes the above-mentioned relay installation detection device.

[0023] The technical effects of the present invention are:

[0024] The high voltage at the front and rear ends of the relay of the present invention is connected through a copper busbar, and the voltage detection signal is connected through the line on the circuit board, which reduces the connection harness and solves the process problems such as harness connection error; at the same time, a magnetic induction detection chip is used to detect the current, which reduces the space occupied by the current detection device and reduces the cost.

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a relay installation detection device for a new energy vehicle according to an embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of a relay installation detection device according to an embodiment of the present invention;

[0028] Figure 3 for Figure 2 A top view of

[0029] Figure 4 for Figure 3 Left view of

[0030] Figure 5 for Figure 3 Right view of;

[0031] Figure 6 A schematic diagram of the circuit board structure according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the installation of a magnetic induction detection chip and a shielding sheet according to an embodiment of the present invention;

[0033] Figure 8 for Figure 7 Side view of

[0034] Fig. 9 This is a schematic diagram of a control method according to an embodiment of the present invention.

[0035] Among them, the reference numerals

[0036] 1. Drive motor

[0037] 2Integrated controller

[0038] 3. Relay installation detection device

[0039] 31 Circuit board

[0040] 311 air avoidance positioning slot

[0041] 312 control signal interface

[0042] 313 shielding installation slot

[0043] 314 screw holes

[0044] 315 voltage / current signal interface

[0045] 32 Magnetic detection chip

[0046] 33 Input copper busbar

[0047] 34 output copper busbar

[0048] 35 shielding sheet

[0049] 36 Fastening screws

[0050] 4 Relays

[0051] 41 Input pole piece

[0052] 42 output pole piece

[0053] 43 control signal line

[0054] 5. Air conditioning

[0055] 6Electric defrost device

[0056] 7External DCDC

[0057] 8Electric heating device

[0058] 9 Oil pump

[0059] 10Battery positive terminal

[0060] 11Battery negative terminal

[0061] 12DC+Terminal DETAILED DESCRIPTION

[0062] The structural principle and working principle of the present invention are described in detail below in conjunction with the accompanying drawings:

[0063] See also Figure 1 , Figure 1 The schematic diagram of the relay installation detection device 3 installed in a new energy vehicle of an embodiment of the present invention. The new energy vehicle of the present invention comprises a driving motor 1, an integrated controller 2 and a relay installation detection device 3 installed in the integrated controller 2, wherein the driving motor 1 is connected to the integrated controller 2; the integrated controller 2 may include a vehicle control module and a motor control module, wherein the vehicle control module is connected to the relay control module in the relay 4, and the motor control module is connected to the driving motor 1; each relay 4 is installed and connected to the relay installation detection device 3, and is respectively connected to the corresponding air conditioner 5, electric defrost device 6, external DCDC 7, electric heating device 8, oil pump 9, battery positive electrode 10, battery negative electrode 11, DC+ terminal 12, etc. The relay installation detection device 3 is used to control the on and off of the load circuits such as the air conditioner 5, electric defrost device 6, external DCDC 7, electric heating device 8, oil pump 9, DC+ terminal 12, battery positive electrode 10 and battery negative electrode 11 of the new energy vehicle. The composition, structure, relative position relationship, connection relationship and function of other parts of the new energy vehicle are all relatively mature existing technologies, so they will not be elaborated here. The following is a detailed description of the relay installation detection device 3 of the present invention.

[0064] See also Figure 2-Figure 5 , Figure 2 The structure of a relay installation detection device 3 according to an embodiment of the present invention is shown in FIG. Figure 3 for Figure 2 A top view of Figure 4 for Figure 3 The left view of Figure 5 for Figure 3Right view of . The relay installation detection device 3 of the present invention is installed in the integrated controller 2 of the new energy vehicle, and includes: a circuit board 31, on which a plurality of air-avoiding positioning slots 311 for correspondingly installing the relay 4 are sequentially arranged along the length direction; a plurality of magnetic induction detection chips 32, one of which is arranged corresponding to each of the air-avoiding positioning slots 311; an input copper bus 33, located below the circuit board 31, and respectively connected to the circuit board 31 and the input pole piece 41 of the relay 4; an output copper bus 34, arranged below the circuit board 31 opposite to the input copper bus 33, and respectively connected to the circuit board 31 and the output pole piece 42 of the relay 4; and a shielding sheet 35, on which a group of shielding installation grooves 313 are arranged corresponding to each of the air-avoiding positioning slots 311 on the circuit board 31, and each group of the shielding installation grooves 313 are symmetrically arranged on both sides of the magnetic induction detection chip 32, and the shielding sheet 35 passes through the shielding installation grooves 313 and covers the output copper bus 34 between the circuit board 31 and the shielding sheet 35.

[0065] See also Figure 6-Figure 8 , Figure 6 Schematic diagram of the structure of a circuit board 31 according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the installation of the magnetic induction detection chip 32 and the shielding sheet 35 according to an embodiment of the present invention. Figure 8 for Figure 7 . In this embodiment, screw holes 314 are symmetrically arranged on both sides of each of the air-avoiding positioning slots 311, and a fastening screw 36 passes through the screw hole 314 on one side to connect the circuit board 31, the input copper busbar 33 and the input pole piece 41 of the relay 4; another fastening screw 36 passes through the screw hole 314 on the other side to connect the circuit board 31, the output copper busbar 34 and the output pole piece 42 of the relay 4. Among them, the shielding sheet 35 is a rectangular frame structure with an open upper end, and the distance between the two side walls of the shielding sheet 35 is a spacing W, and the spacing W is equal to the distance between each group of the shielding installation slots 313, and the spacing W is greater than or equal to the width of the output copper busbar 34; the spacing W is greater than the width of the magnetic induction detection chip 32. The distance H between the magnetic induction detection chip 32 and the top of the shielding sheet 35 is greater than 1 / 2 of the spacing W.

[0066] The circuit board 31 of this embodiment is also provided with a control signal interface 312, and the control signal line 43 of the relay 4 is connected to the control signal interface 312. The control signal interface 312 is provided corresponding to the shielding installation groove 313 and is respectively located on both sides of the circuit board 31 near the edge. One or more control signal interfaces 312 can be provided as needed, and the control signal interface 312 can be provided on the top surface or side of the circuit board; the air-avoiding positioning slot 311 is located between the control signal interface 312 and the shielding installation groove 313. The circuit board 31 is preferably a PCB board, and a voltage circuit for connecting the voltage detection signal of the relay 4 is provided on the PCB board. A voltage / current signal interface 315 is also provided on the circuit board 31, and the voltage detection signal of the relay 4 is connected to the voltage / current signal interface 315 through the voltage circuit.

[0067] In the relay installation detection device 3 of the present embodiment, the magnetic induction detection chip 32 is arranged on the circuit board 31, and shielding installation grooves 313 are arranged on both sides of the magnetic induction detection chip 32 of the circuit board 31. The circuit board 31 is provided with screw holes 314 respectively connected to the input pole piece 41 and the output pole piece 42 of the relay 4, a space-avoiding positioning slot hole 311 for installing the relay 4, a control signal interface 312 and a voltage / current signal interface 315. The input copper bar 33 and the output copper bar 34 are connected to the input pole piece 41 and the output pole piece 42 of the relay 4 respectively. The circuit board 31 is on the input copper bar 33 and the output copper bar 34. The circuit board 31, the input copper bar 33, and the output copper bar 34 are connected to the input pole piece 41 and the output pole piece 42 of the relay 4 by fastening screws 36. The shielding sheet 35 passes through the shielding installation groove 313 of the circuit board 31 and wraps the output copper bar 34. The distance H from the magnetic induction detection chip 32 to the top of the shielding sheet 35 is greater than half of the spacing W of the shielding sheet 35, that is, H>0.5W. The control signal line 43 of the relay 4 is connected to the control signal interface 312 of the circuit board 31. The voltage signal of the front and rear ends of the relay 4 is connected to the voltage / current signal interface 315 of the circuit board 31 through the line on the circuit board 31. The current signal detected by the magnetic induction detection chip 32 is connected to the voltage / current signal interface 315 of the circuit board 31 through the line on the circuit board 31. The relay control signal, the voltage signal at the front and rear ends of the relay, and the current signal are connected to the relay control module through the control signal interface 312 and the voltage / current signal interface 315 on the circuit board 31 .

[0068] The circuit board 31 is a PCB board, and the voltage detection signal of the relay 4 is connected through the circuit on the PCB. When starting to work, the relay 4 decides whether to close according to the voltage difference between its front and rear ends. When the voltage difference < V0, the relay 4 closes. V0 can be determined according to the characteristics of the relay 4. Usually, V0 = 20V. When the load at the rear pole of the relay 4 works normally and the relay 4 is powered off, the vehicle current is first reduced until the magnetic induction detection chip 32 detects that the loop current value I < b0, then the relay control module can issue an instruction to disconnect the relay 4. The current value b0 is the breaking current determined according to the characteristics of the relay 4. For example, this breaking current value b0 is the rated current value of the relay. The current signal detected by the magnetic induction detection chip 32 is transmitted through the circuit on the circuit board 31 to the voltage / current signal interface 315, and then connected to the relay control module. If an abnormal fault occurs in the load at the rear pole of the relay 4, at this time, there is a large current passing through the loop of the relay 4, but the VCU (integrated controller 2) still issues an instruction to cut off the relay 4. If the magnetic induction detection chip 32 detects that the loop current value I > b0, the relay control module cannot issue an instruction to disconnect the relay 4. It is necessary until the magnetic induction detection chip 32 detects that the loop current value I < b0, then the relay control module can issue an instruction to disconnect the main relay 4. The breaking current value b0 of each electrical loop relay 4 is determined by the characteristics of the relay 4 on this branch, and the loop current value I on this branch is detected and obtained by the magnetic induction detection chip 32. If the loop current value I > b0 causes the relay 4 not to disconnect for a long time, the fuse on this branch will blow first to protect the safety of the entire branch.

[0069] See Fig. 9 , Fig. 9 is the schematic diagram of the control method of an embodiment of the present invention. The relay installation detection device 3 is installed on the new energy vehicle of the present invention and is connected to the integrated controller 2 of the new energy vehicle. The relay control method includes the following steps:

[0070] Step S100: The vehicle control module in the integrated controller 2 sends an instruction to cut off the relay 4 to the relay control module;

[0071] Step S200: The relay control module controls the relay installation detection device 3 to start detecting the loop current value I of the relay 4 and compares it with the breaking current value b0 of the relay 4;

[0072] Step S300: If the loop current value I detected by the magnetic induction detection chip 32 of the relay installation detection device 3 < b0, the relay control module issues an instruction to disconnect the relay 4; and

[0073] Step S400: If the detected loop current value I > b0, the relay control module does not issue a relay 4 disconnection instruction; until the detected loop current value I < b0, the relay control module can issue a relay 4 disconnection instruction.

[0074] Among them, the breaking current value b0 of each electrical loop relay 4 is determined by the characteristics of the relay 4 in this branch. The loop current value I of this branch is obtained by the magnetic induction detection chip 32; if the current value I > b0 causes the relay 4 not to disconnect for a long time, the fuse installed on this branch will fuse first to protect the safety of the entire branch. As Fig. 9 shown, the VCU issues an instruction to cut off the relay 4, and the function of the relay control module to detect the circuit current value is started. The breaking current value b0 determined according to the characteristics of the relay 4 is stored in the relay control module, and the loop current value I detected by each branch magnetic induction detection chip 32 is stored in the relay control module. The detected loop current value I is compared with the breaking current value b0. When I < b0, the inspection passes, and the relay 4 is triggered to perform the disconnection action; when I > b0, the inspection fails, and the relay 4 does not perform the disconnection action.

[0075] In the present invention, the magnetic induction detection chip 32 is used to detect the current value, and the relay control module issues an instruction to disconnect the relay 4 according to the set conditions, which can effectively ensure that the relay 4 is cut off at an appropriate current, avoid the arcing and even adhesion of the relay 4 caused by cutting off at a large current, and effectively improve the service life of the relay 4. The high voltage at the front and rear ends of the relay 4 is connected by a copper bar, and the voltage detection signal is connected through the circuit on the circuit board 31, reducing the connection wire harness and solving the technological problems such as incorrect connection of the wire harness; at the same time, the magnetic induction detection chip 32 is used to detect the current, reducing the space occupied by the current detection device and reducing the cost.

[0076] Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A relay installation detection device, characterized in that: Installed in the integrated controller of new energy vehicles, including: A circuit board, wherein a plurality of air-avoiding positioning slots for correspondingly installing relays are sequentially arranged along the length direction of the circuit board; A plurality of magnetic induction detection chips, one magnetic induction detection chip is arranged corresponding to each of the air-avoiding positioning slots; An input copper busbar is located below the circuit board and is connected to the circuit board and the input pole piece of the relay respectively; An output copper busbar is arranged below the circuit board opposite to the input copper busbar and is respectively connected to the circuit board and the output pole piece of the relay; and A shielding sheet, wherein a group of shielding installation grooves are arranged on the circuit board corresponding to each of the air-avoiding positioning slots, and each group of the shielding installation grooves are symmetrically arranged on both sides of the magnetic induction detection chip, and the shielding sheet passes through the shielding installation grooves and covers the output copper busbar between the circuit board and the shielding sheet.

2. The relay installation detection device according to claim 1, characterized in that: Screw holes are symmetrically arranged on both sides of each of the air-avoiding positioning slots. A fastening screw passes through the screw hole on one side to connect the circuit board, the input copper busbar and the input pole piece of the relay; another fastening screw passes through the screw hole on the other side to connect the circuit board, the output copper busbar and the output pole piece of the relay.

3. The relay installation detection device according to claim 1 or 2, characterized in that: The shielding sheet is a rectangular frame structure with an open upper end, and the distance between the two side walls of the shielding sheet is a spacing W, and the spacing W is equal to the distance between each group of the shielding mounting grooves, and the spacing W is greater than or equal to the width of the output copper busbar; the spacing W is greater than the width of the magnetic induction detection chip.

4. The relay installation detection device according to claim 3, characterized in that: The distance H between the magnetic induction detection chip and the top of the shielding sheet is greater than 1 / 2 of the spacing W.

5. The relay installation detection device according to claim 1 or 2, characterized in that: The circuit board is also provided with a control signal interface, and the control signal line of the relay is connected to the control signal interface.

6. The relay installation detection device according to claim 5, characterized in that: The control signal interface is arranged corresponding to the shielding installation slot and is respectively located on both sides of the circuit board near the edge; the air avoidance positioning slot is located between the control signal interface and the shielding installation slot.

7. The relay installation detection device according to claim 1 or 2, characterized in that: The circuit board is a PCB board, on which a voltage circuit for connecting the voltage detection signal of the relay is provided. The circuit board is also provided with a voltage / current signal interface, and the voltage detection signal of the relay is connected to the voltage / current signal interface through the voltage circuit.

8. A relay control method for a new energy vehicle, characterized in that: The new energy vehicle is equipped with a relay installation detection device according to any one of claims 1 to 7, and is connected to an integrated controller of the new energy vehicle. The relay control method comprises the following steps: S100, the vehicle control module in the integrated controller sends a relay cut-off instruction to the relay control module; S200, the relay control module controls the relay installation detection device to start detecting the loop current value I of the relay, and compares it with the breaking current value b0 of the relay; S300, if the loop current value I detected by the magnetic induction detection chip of the relay installation detection device is less than b0, the relay control module issues a relay disconnection instruction; as well as S400: If the detected loop current value I>b0, the relay control module does not issue a relay disconnection instruction; the relay control module can issue a relay disconnection instruction only when the detected loop current value I<b0.

9. The relay control method for a new energy vehicle as claimed in claim 8, characterized in that: The breaking current value b0 of each electrical circuit relay is determined by the relay characteristics of this branch, and the loop current value I of this branch is obtained by detection by the magnetic induction detection chip; if the current value I>b0 makes the relay not disconnect for a long time, the fuse installed on this branch will blow first to protect the safety of the entire branch.

10. A new energy vehicle, characterized in that: The invention comprises a relay installation detection device as described in any one of claims 1 to 7.

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