High-voltage interlocking detection circuit and method and vehicle

Abstract

The invention discloses a high-voltage interlocking detection circuit and method and a vehicle. The high-voltage interlocking detection circuit comprises a high-voltage loop; the signal source is used for outputting a detection signal; the first end of the sampling resistor is connected with the first end of the signal source, and the second end of the sampling resistor is connected with the high-voltage loop, so that when the detection signal is output, the high-voltage interlocking state of the high-voltage loop is detected through the voltage value of the sampling resistor. By adopting the circuit, the cost of high-voltage interlocking detection can be reduced.

Description

Technical Field

[0001] The present application relates to the field of computer technology, and more specifically, to a high-voltage interlock detection circuit, method and vehicle. Background Art

[0002] In order to avoid harm to the human body caused by high voltage electricity and ensure the safe operation of the vehicle, corresponding detection logic or detection circuit is usually designed on the vehicle to detect the high voltage interlocking state.

[0003] Existing detection schemes can be Figure 1 As shown, the BMS (Battery Management System) can be controlled to output a PWM (Pulse Width Modulation) signal. In addition, for each high-voltage component in the high-voltage circuit, the PWM signal can be input from the low-voltage connector of the high-voltage component to the high-voltage connector port through two low-voltage wire harnesses, and a short-circuit harness exists on the connector terminal of the high-voltage wire harness to form a PWM signal loop, so as to detect the state of the PWM signal loop and realize the detection of the high-voltage interlocking state.

[0004] Because in the existing detection scheme, each high-voltage component has two low-voltage wire harnesses and a reserved plug-in interface, the detection cost is relatively high. Summary of the invention

[0005] In view of the above problems, the present application proposes a high-voltage interlock detection circuit, method and vehicle to improve the above problems.

[0006] In a first aspect, the present application provides a high-voltage interlock detection circuit, comprising: a high-voltage circuit; a signal source for outputting a detection signal; a sampling resistor, wherein a first end of the sampling resistor is connected to a first end of the signal source, and a second end of the sampling resistor is connected to the high-voltage circuit, so that when the detection signal is output, the high-voltage interlock state of the high-voltage circuit is detected by the voltage value of the sampling resistor.

[0007] In a second aspect, the present application provides a high-voltage interlock detection method, which is applied to the above-mentioned high-voltage interlock detection circuit, and the method includes: when the high-voltage circuit is turned on, controlling the signal source to output a detection signal; obtaining the voltage value of the sampling resistor; and determining the high-voltage interlock state of the high-voltage circuit based on the voltage value.

[0008] In a third aspect, the present application provides a vehicle, comprising a vehicle body and the above-mentioned high-voltage interlock detection circuit, wherein the high-voltage interlock detection circuit is arranged on the vehicle body.

[0009] In a fourth aspect, the present application provides another vehicle, comprising one or more processors and a memory; one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs are configured to execute the above-mentioned method.

[0010] In a fifth aspect, the present application provides a computer-readable storage medium, in which program code is stored, wherein the above method is executed when the program code is run.

[0011] The present application provides a high-voltage interlock detection circuit, method and vehicle, wherein the high-voltage interlock detection circuit includes a high-voltage circuit; a signal source for outputting a detection signal; a sampling resistor, wherein the first end of the sampling resistor is connected to the first end of the signal source, and the second end of the sampling resistor is connected to the high-voltage circuit, so that when the detection signal is output, the high-voltage interlock state of the high-voltage circuit is detected by the voltage value of the sampling resistor. The signal source and the sampling resistor are directly connected to the high-voltage circuit, and the high-voltage interlock state of the high-voltage circuit can be detected by the voltage value of the sampling resistor when the detection signal of the signal source is output. By adopting the above circuit, the cost of high-voltage interlock detection can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 A schematic diagram of an existing detection scheme provided by the present application is shown;

[0014] Figure 2 A schematic diagram of the structure of a high-voltage interlock detection circuit provided in an embodiment of the present application is shown;

[0015] Figure 3 A schematic diagram of the structure of a high-voltage interlock detection circuit provided in an embodiment of the present application is shown;

[0016] Figure 4 A schematic diagram of the structure of a high-voltage interlock detection circuit provided in an embodiment of the present application is shown;

[0017] Figure 5 A schematic diagram showing the existing detection scheme provided by the present application and the scheme provided by the present application;

[0018] Figure 6 A flow chart of a high voltage interlock detection method proposed in an embodiment of the present application is shown;

[0019] Figure 7 A schematic diagram of an equivalent circuit proposed in the present application is shown;

[0020] Figure 8 A schematic diagram showing another equivalent circuit proposed in the present application is shown;

[0021] Fig. 9 A structural block diagram of a vehicle provided by the present application is shown;

[0022] Fig.10 A structural block diagram of another vehicle provided by the present application is shown. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] In an embodiment of the present application, the inventor proposes a high-voltage interlock detection circuit, method, and vehicle, wherein the high-voltage interlock detection circuit includes a high-voltage circuit; a signal source for outputting a detection signal; a sampling resistor, wherein the first end of the sampling resistor is connected to the first end of the signal source, and the second end of the sampling resistor is connected to the high-voltage circuit, so that when the detection signal is output, the high-voltage interlock state of the high-voltage circuit is detected by the voltage value of the sampling resistor. The signal source and the sampling resistor are directly connected to the high-voltage circuit, and the high-voltage interlock state of the high-voltage circuit can be detected by the voltage value of the sampling resistor when the detection signal of the signal source is output. By adopting the above circuit, the cost of high-voltage interlock detection can be reduced.

[0025] The high-voltage interlock detection circuit provided in the embodiment of the present application will be described in detail below through specific embodiments.

[0026] See also Figure 2 , which shows a structural block diagram of a high-voltage interlock detection circuit provided by an embodiment of the present application. The high-voltage interlock detection circuit 100 may include: a high-voltage loop 110, a signal source 120 and a sampling resistor 130.

[0027] Among them, the signal source 120 can be used to output a detection signal; the first end of the sampling resistor 130 can be connected to the first end of the signal source, and the second end of the sampling resistor 130 can be connected to the high-voltage circuit 110, so that when the detection signal is output, the high-voltage interlocking state of the high-voltage circuit 110 can be detected through the voltage value of the sampling resistor 130.

[0028] The signal source 120 may be a battery management system BMS. The BMS in a vehicle may be used to monitor the status of the battery, such as temperature, voltage, and current; control the battery charging and discharging process to ensure that the battery operates within a safe operating range; balance the performance of individual batteries in the battery pack to prevent overcharging or over-discharging of individual batteries; predict the health and life of the battery and warn of potential problems in advance; protect the battery from damage in the event of a fault; and optimize battery performance and improve energy efficiency.

[0029] The detection signal can be used to detect the high-voltage interlocking state of the high-voltage circuit 110. The high-voltage interlocking state can be understood as whether the high-voltage components in the high-voltage circuit 110 are connected normally. Whether the high-voltage components are connected normally can be understood as whether the high-voltage connector is disconnected. In the embodiment of the present application, the detection signal can be a sine wave signal with an output frequency of f (such as 10kHz).

[0030] The sampling resistor 130 may be used to detect the resistance of the high-voltage interlocking state of the high-voltage circuit 110 .

[0031] In the present embodiment, a high-voltage interlock detection circuit is proposed, in which a signal source and a sampling resistor are directly connected to a high-voltage loop, and when a detection signal of the signal source is output, the high-voltage interlock state of the high-voltage loop can be detected by the voltage value of the sampling resistor. By adopting the above circuit, the cost of high-voltage interlock detection can be reduced.

[0032] In some embodiments, see Figure 3 , which shows a structural block diagram of a high-voltage interlock detection circuit provided by an embodiment of the present application. The second end of the sampling resistor 130 is connected to the high-voltage loop 110 through a coupling circuit 140 .

[0033] The coupling circuit 140 may include a coupling resistor 141 and a coupling capacitor 142 , wherein a first end of the coupling resistor 141 is connected to the sampling resistor 130 , a second end of the coupling resistor 141 is connected to a first end of the coupling capacitor 142 ; and a second end of the coupling capacitor 142 is connected to the high voltage circuit 110 .

[0034] In this embodiment, the coupling circuit 140 is a resistor-capacitor coupling circuit, which can realize effective signal transmission. The signal of the input coupling circuit 140 is transmitted to the high-voltage loop 110 through the coupling capacitor 142, which can improve the transmission efficiency and maintain the signal integrity. This is equivalent to transmitting the sinusoidal wave signal to the high-voltage loop 110 through the coupling circuit 140 in this embodiment.

[0035] The high-voltage circuit 110 may include a high-voltage bus 111 , a second end of the coupling capacitor 142 is connected to the negative electrode of the high-voltage bus 111 in the high-voltage circuit, and a second end of the signal source 120 is grounded.

[0036] In some embodiments, see Figure 4 , which shows a block diagram of a high-voltage interlock detection circuit provided by an embodiment of the present application. The high-voltage circuit may include a power battery 112, a high-voltage bus 111, and a high-voltage component module 113. The positive electrode of the power battery 112 is connected to the positive electrode of the high-voltage bus 111, and the negative electrode of the power battery 112 is connected to the negative electrode of the high-voltage bus 111. The power battery 112 can be used to supply power to the high-voltage component module 113; the input end of the high-voltage component module 113 is connected to the positive electrode of the high-voltage bus 111, and the output end of the high-voltage component module 113 is connected to the negative electrode of the high-voltage bus 111; the second end of the sampling resistor 130 is connected to the output end of the high-voltage component module 113.

[0037] Among them, the high-voltage component module 113 includes at least two high-voltage components among a high-voltage compressor (CMPR) 1131, a power system (IPS) 1132, an electric drive system (DCU) 1133 and a heater (PTC) 1134, and at least two high-voltage components can be connected in parallel with each other through the high-voltage bus 111.

[0038] Each high-voltage component is provided with a high-voltage connector, and each high-voltage component can be connected in parallel with the high-voltage busbar 111 through the high-voltage connector.

[0039] Among them, each high-voltage component may include a first common-mode capacitor, a second common-mode capacitor and a differential-mode capacitor, the first end of the first common-mode capacitor is connected to the positive electrode of the high-voltage bus 111, and the second end of the first common-mode capacitor is grounded; the first end of the second common-mode capacitor is connected to the negative electrode of the high-voltage bus 111, and the second end of the second common-mode capacitor is grounded; the first end of the differential-mode capacitor is connected to the positive electrode of the high-voltage bus 111, and the second end of the differential-mode capacitor is connected to the negative electrode of the high-voltage bus 111.

[0040] Among them, differential mode capacitors (X capacitors) can be used to suppress differential mode interference, that is, interference between two wires (positive and negative poles of the high-voltage bus). Common mode capacitors (Y capacitors) can be used to suppress common mode interference, that is, interference between a wire and a ground wire. The first common mode capacitor can reduce interference caused by voltage and current changes between the positive pole of the high-voltage bus and the ground wire, and the second common mode capacitor can reduce interference caused by voltage and current changes between the negative pole of the high-voltage bus and the ground wire.

[0041] The high-voltage circuit 110 further includes a first relay 114 and a second relay 115 . The positive electrode of the power battery 112 is connected to the positive electrode of the high-voltage bus 111 through the first relay 114 , and the negative electrode of the power battery 112 is connected to the negative electrode of the high-voltage bus 111 through the second relay 113 .

[0042] The first relay 114 and the second relay 115 may be high voltage DC relays.

[0043] Please refer again Figure 4 When the high-voltage component module 113 includes four high-voltage components, namely, a high-voltage compressor 1131, a power supply system 1132, an electric drive system 1133 and a heater 1134, a first end of a first common-mode capacitor 11311 in the high-voltage compressor 1131 is connected to the positive electrode of the high-voltage bus 111, and a second end of the first common-mode capacitor 11311 is grounded; a first end of a second common-mode capacitor 11312 is connected to the negative electrode of the high-voltage bus 111, and a second end of the second common-mode capacitor 11312 is grounded; a first end of a differential-mode capacitor 11313 is connected to the positive electrode of the high-voltage bus 111, and a second end of the differential-mode capacitor 11313 is connected to the negative electrode of the high-voltage bus 111.

[0044] The first end of the first common-mode capacitor 11321 in the power supply system 1132 is connected to the positive electrode of the high-voltage bus 111, and the second end of the first common-mode capacitor 11321 is grounded; the first end of the second common-mode capacitor 11322 is connected to the negative electrode of the high-voltage bus 111, and the second end of the second common-mode capacitor 11322 is grounded; the first end of the differential mode capacitor 11323 is connected to the positive electrode of the high-voltage bus 111, and the second end of the differential mode capacitor 11323 is connected to the negative electrode of the high-voltage bus 111.

[0045] The first end of the first common-mode capacitor 11331 in the electric drive system 1133 is connected to the positive electrode of the high-voltage bus 111, and the second end of the first common-mode capacitor 11331 is grounded; the first end of the second common-mode capacitor 11332 is connected to the negative electrode of the high-voltage bus 111, and the second end of the second common-mode capacitor 11332 is grounded; the first end of the differential-mode capacitor 11333 is connected to the positive electrode of the high-voltage bus 111, and the second end of the differential-mode capacitor 11333 is connected to the negative electrode of the high-voltage bus 111.

[0046] The first end of the first common-mode capacitor 11341 in the heater 1134 is connected to the positive electrode of the high-voltage bus 111, and the second end of the first common-mode capacitor 11341 is grounded; the first end of the second common-mode capacitor 11342 is connected to the negative electrode of the high-voltage bus 111, and the second end of the second common-mode capacitor 11342 is grounded; the first end of the differential-mode capacitor 11343 is connected to the positive electrode of the high-voltage bus 111, and the second end of the differential-mode capacitor 11343 is connected to the negative electrode of the high-voltage bus 111.

[0047] It should be noted that, usually, the high-voltage component itself is provided with a first common-mode capacitor, a second common-mode capacitor, and a differential-mode capacitor, and the first common-mode capacitor, the second common-mode capacitor, and the differential-mode capacitor provided by the high-voltage component itself can function as filtering in the high-voltage component. If a high-voltage component itself is not provided with a first common-mode capacitor and a second common-mode capacitor, the first common-mode capacitor and the second common-mode capacitor can be added to the high-voltage component first. In this embodiment, the first common-mode capacitor and the second common-mode capacitor can be used to detect whether the high-voltage component is in a high-voltage interlocking state.

[0048] In this embodiment, when the connector of the high-voltage component is in an inserted state or an unplugged state, the Y capacitor can be connected to or removed from the detection circuit, thereby causing the voltage value of the sampling resistor to change. Therefore, the high-voltage interlocking state of the high-voltage circuit can be determined by the voltage value of the sampling resistor.

[0049] Furthermore, it should be noted that Figure 4 R sir 、z b , z1~z4 are predetermined equivalent circuit parameters, not real components, where R sir It can refer to the insulation resistance of the high voltage bus 111, z b It may refer to the impedance of the power battery 112 under the detection signal with an output frequency of f, z1 may refer to the impedance of the high-pressure compressor 1131 under the detection signal with an output frequency of f, z2 may refer to the impedance of the power supply system 1132 under the detection signal with an output frequency of f, z3 may refer to the impedance of the electric drive system 1133 under the detection signal with an output frequency of f, and z4 may refer to the impedance of the heater 1134 under the detection signal with an output frequency of f.

[0050] The difference between the circuit provided in this embodiment and the circuit provided in the prior art can be as follows: Figure 5 As shown, Figure 5 In the existing solution shown in the figure above, each high-voltage component needs to reserve a low-voltage connector, and a detection loop needs to be formed through a low-voltage wiring harness and a PWM signal; Figure 5 In the scheme shown in the figure below, a sampling resistor and a coupling circuit are directly added to the high-voltage circuit, and the sampling resistor is connected to the sinusoidal wave detection signal to form a detection circuit, thereby reducing the detection cost.

[0051] The high-voltage interlock detection method provided in the embodiment of the present application will be described in detail below through specific examples.

[0052] See also Figure 6 A high-voltage interlock detection method provided in an embodiment of the present application is applied to the above-mentioned high-voltage interlock detection circuit, and the method includes:

[0053] S110: When the high-voltage circuit is turned on, controlling the signal source to output a detection signal.

[0054] As a method, after the high-voltage circuit is turned on and the signal source (battery management system BMS) is powered on, the signal source can be controlled to output a detection signal.

[0055] S120: Obtaining the voltage value of the sampling resistor.

[0056] As one approach, a detection head may be provided at the sampling resistor, and the voltage value of the sampling resistor may be acquired through the detection head.

[0057] Optionally, the BMS can obtain the voltage value of the sampling resistor through the detection head.

[0058] It should be noted that the solution proposed in this application can obtain the voltage value of the sampling resistor in real time, so as to determine the high-voltage interlocking state of the high-voltage circuit in real time, and then when the high-voltage circuit is not in the high-voltage interlocking state, relevant measures can be taken in time (such as reporting the fault to the user or the cloud, and guiding the user to perform safe operations) to improve the safety of the vehicle.

[0059] S130: Determine a high voltage interlocking state of the high voltage circuit based on the voltage value.

[0060] As a method, if the voltage value is a preset voltage value, it is determined that all high-voltage components in the high-voltage circuit are in a high-voltage interlocking state.

[0061] Optionally, the preset voltage value can be calculated based on an equivalent circuit when all high-voltage components in the high-voltage circuit are in a high-voltage interlocking state, wherein the calculation method can be: the output frequency of the detection signal, the impedance corresponding to each high-voltage component in the high-voltage circuit, the capacitance value of the first common-mode capacitor, and the capacitance value of the differential-mode capacitor, to obtain the port impedance of each high-voltage component; based on the port impedance of each high-voltage component, the total impedance of the high-voltage circuit is obtained, and the total impedance can be the sum of the impedances of all high-voltage components and the power battery in the high-voltage circuit when the detection signal is output; based on the voltage value of the detection signal, the total impedance and the resistance value of the sampling resistor, the preset voltage value is obtained.

[0062] Herein, port impedance may refer to the impedance of all components in the high voltage component.

[0063] When the high-voltage component module includes four high-voltage components, namely CMPR, IPS, DCU and PTC, and all high-voltage components in the high-voltage circuit are in the high-voltage interlocking state, the equivalent circuit can be as follows: Figure 7 As shown, the calculation formula of CMPR port impedance can be:

[0064]

[0065] Among them, z1 can represent the impedance of CMPR when the detection signal is output, f can represent the output frequency of the detection signal, C x1 The capacitance value of the differential mode capacitor that can represent CMPR, C y1 The capacitance value of the first common mode capacitor may represent CMPR.

[0066] The calculation formula of IPS port impedance can be:

[0067]

[0068] Among them, z2 can represent the impedance of IPS when the detection signal is output, f can represent the output frequency of the detection signal, C x2 It can represent the capacitance value of the differential mode capacitance of IPS, C y3 It can represent the capacitance value of the first common-mode capacitor of IPS.

[0069] The calculation formula of DCU port impedance can be:

[0070]

[0071] Among them, z3 can represent the impedance of DCU when the detection signal is output, f can represent the output frequency of the detection signal, C x3 It can represent the capacitance value of the differential mode capacitor of DCU, C y5 It can represent the capacitance value of the first common-mode capacitor of the DCU.

[0072] The calculation formula of PTC port impedance can be:

[0073]

[0074] Among them, z4 can represent the impedance of PTC when the detection signal is output, f can represent the output frequency of the detection signal, C x4 It can represent the capacitance value of the differential mode capacitor of PTC, C y7 It can represent the capacitance value of the first common mode capacitor of the PTC.

[0075] The calculation formula for the total impedance of the high-voltage circuit can be:

[0076]

[0077] Among them, Z1 can represent the z in the equivalent circuit b and z b The impedance of the subsequent circuit, z b It can refer to the impedance of the power battery, and Z2 can represent C in the equivalent circuit. y2 , C y4 , C y6 , C y8The impedance of the parallel circuit formed, Z3 can represent the total impedance of the high-voltage circuit, The impedance of the second common-mode capacitor that can represent CMPR is, It can represent the impedance of the second common-mode capacitor of IPS, It can represent the impedance of the second common-mode capacitor of DCU, The impedance of the second common-mode capacitor of the PTC can be expressed as Can be expressed and Multiply.

[0078] The calculation formula of the preset voltage value can be:

[0079]

[0080] Among them, V P1 It can represent the voltage value of the signal source, R1 can represent the resistance value of the sampling resistor, R in Can represent the resistance value of the coupling resistor, Z cin It can represent the impedance of the coupling capacitor, R sir It can indicate the insulation resistance of high voltage busbar.

[0081] Among them, in actual situations, the capacitance value of the differential mode capacitor >> the capacitance value of the common mode capacitor, R sir The unit can be MΩ, so the calculation formula of the preset voltage value is can be simplified to:

[0082]

[0083] in, The impedance of the first common-mode capacitor that can represent CMPR is, It can represent the impedance of the first common mode capacitor of IPS, It can represent the impedance of the first common-mode capacitor of DCU, The impedance of the first common mode capacitor of the PTC may be represented.

[0084]

[0085] When the high-voltage component module includes four high-voltage components, namely CMPR, IPS, DCU and PTC, and the PTC in the high-voltage circuit is not in the high-voltage interlocking state, the equivalent circuit can be as follows: Figure 8 As shown, the calculation formula of CMPR port impedance can be:

[0086]

[0087] Among them, z1 can represent the impedance of CMPR when the detection signal is output, f can represent the output frequency of the detection signal, Cx1 The capacitance value of the differential mode capacitor that can represent CMPR, C y1 The capacitance value of the first common mode capacitor may represent CMPR.

[0088] The calculation formula of IPS port impedance can be:

[0089]

[0090] Among them, z2 can represent the impedance of IPS when the detection signal is output, f can represent the output frequency of the detection signal, C x2 It can represent the capacitance value of the differential mode capacitance of IPS, C y3 It can represent the capacitance value of the first common-mode capacitor of IPS.

[0091] The calculation formula of DCU port impedance can be:

[0092]

[0093] Among them, z3 can represent the impedance of DCU when the detection signal is output, f can represent the output frequency of the detection signal, C x3 It can represent the capacitance value of the differential mode capacitor of DCU, C y5 It can represent the capacitance value of the first common-mode capacitor of the DCU.

[0094] The calculation formula for the total impedance of the high-voltage circuit can be:

[0095]

[0096] Among them, Z1 can represent the z in the equivalent circuit b and z b The impedance of the subsequent circuit, Z2, can represent the total impedance of the high-voltage circuit, Z cy2 The impedance of the second common-mode capacitor, Z, can represent the CMPR. cy4 It can represent the impedance of the second common-mode capacitor of IPS, Z cy6 It can represent the impedance of the second common-mode capacitor of the DCU.

[0097] At this time, the calculation formula of the voltage value of the sampling resistor can be:

[0098]

[0099] Among them, V P1 It can represent the voltage value of the signal source, R1 can represent the resistance value of the sampling resistor, R in Can represent the resistance value of the coupling resistor, Z cin It can represent the impedance of the coupling capacitor, R sir It can indicate the insulation resistance of high voltage busbar.

[0100] Among them, in actual situations, the capacitance value of the differential mode capacitor >> the capacitance value of the common mode capacitor, R sir The unit can be MΩ, so the calculation formula of the preset voltage value is can be simplified to:

[0101]

[0102] in, The impedance of the first common-mode capacitor that can represent CMPR is, It can represent the impedance of the first common mode capacitor of IPS, It can represent the impedance of the first common-mode capacitor of DCU, The impedance of the first common mode capacitor of the PTC may be represented.

[0103] For example, based on the above formula, when the output frequency of the detection signal is 10kHz, the sampling resistor is 10Ω, Rin is 0.1Ω, Cin is 6800nF, C y1 ~C y8 When it is 220nF, the preset voltage value can be 5.6V; when the PTC is not in the high-voltage interlock state, the voltage value of the sampling resistor can be 4.9V.

[0104] It can be known from the above formula that the voltage of the sampling resistor is related to the Y capacitor, but has nothing to do with the X capacitor that must exist in the high-voltage component itself. Optionally, when the Y capacitors of all high-voltage components are different, multiple preset voltage values ​​can be set, and by comparing the voltage value obtained in step S120 with multiple preset voltage values ​​(such as the voltage value in the high-voltage circuit interlocking state, the voltage value when only PTC is disconnected, the voltage value when only DCU is disconnected, the voltage value when PTC and DCU are disconnected, etc.), it can be determined whether all high-voltage components in the high-voltage circuit are in the high-voltage interlocking state; and when there are high-voltage components in the high-voltage circuit that are not in the high-voltage interlocking state, based on the comparison results of the voltage value with multiple preset voltage values, the high-voltage components that are not in the high-voltage interlocking state are determined, thereby improving the efficiency of troubleshooting.

[0105] As another way, since the circuit will be interfered by various factors during actual application, resulting in differences between the measured value and the calculated value, in order to improve the accuracy of the judgment, if the difference between the voltage value and the preset voltage value is within the preset range, it can be determined that all high-voltage components in the high-voltage circuit are in a high-voltage interlocking state.

[0106] The present embodiment provides a high-voltage interlock detection method, which controls a signal source to output a detection signal when a high-voltage circuit is turned on; obtains a voltage value of a sampling resistor; and determines a high-voltage interlock state of the high-voltage circuit based on the voltage value, so that the signal source and the sampling resistor are directly connected to the high-voltage circuit. When the detection signal of the signal source is output, the high-voltage interlock state of the high-voltage circuit can be detected by the voltage value of the sampling resistor, thereby reducing the cost of high-voltage interlock detection.

[0107] See also Fig. 9 , Fig. 9 The structural block diagram of a vehicle provided by an embodiment of the present application is shown below. Fig. 9 The vehicle 200 includes: a vehicle body 210 and the above-mentioned high-voltage interlock detection circuit 100 , wherein the high-voltage interlock detection circuit 100 is disposed in the vehicle body 210 .

[0108] In the embodiment of the present application, each functional module of the vehicle 200 can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0109] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the working process of the high-voltage interlock detection circuit 100 during the specific operation of the vehicle 200 can refer to the description of the corresponding process of the high-voltage interlock detection circuit 100 in the aforementioned embodiment, and will not be repeated here.

[0110] The following will be combined Fig.10 Another vehicle provided by the present application is described.

[0111] See also Fig.10 Based on the above high-voltage interlock detection method, the embodiment of the present application also provides another vehicle 300 that can execute the above high-voltage interlock detection method. The vehicle 300 includes a processor 302 and a memory 304. The memory 304 stores a program that can execute the content of the above embodiment, and the backup processor 302 can execute the program stored in the memory 304.

[0112] Among them, the processor 302 may include one or more processing cores. The processor 302 uses various interfaces and lines to connect various parts of the entire vehicle 300, and executes various functions and processes data of the vehicle 300 by running or executing instructions, programs, code sets or instruction sets stored in the memory 304, and calling data stored in the memory 304. Optionally, the processor 302 can be implemented in at least one hardware form of a network processor (Neural network Processing Unit, NPU), a digital signal processing (Digital Signal Processing, DSP), a field programmable gate array (Field-Programmable Gate Array, FPGA), and a programmable logic array (Programmable Logic Array, PLA). The processor 302 can integrate one or a combination of a central processing unit (Central Processing Unit, CPU), a graphics processor (Graphics Processing Unit, GPU), a network processor (Neural network Processing Unit, NPU) and a modem. Among them, the CPU mainly processes the operating system, user interface and application programs; the GPU is responsible for rendering and drawing display content; the NPU is responsible for processing multimedia data such as video and images; and the modem is used to process wireless communications. It is understandable that the above-mentioned modem may not be integrated into the processor 302, but may be implemented separately through a communication chip.

[0113] The memory 304 may include a random access memory (RAM), and may also include a read-only memory (RAM) and a double data rate synchronous dynamic random access memory (DDR). The memory 304 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 304 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the following various method embodiments, etc. The data storage area may also store data created by the vehicle 300 during use (such as a phone book, audio and video data, chat record data), etc.

[0114] An embodiment of the present application provides a computer-readable storage medium in which a program code is stored, and the program code can be called by a processor to execute the method described in the above method embodiment.

[0115] The computer readable storage medium may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk, or a ROM. Optionally, the computer readable storage medium includes a non-transitory computer-readable storage medium. The computer readable storage medium has storage space for program codes that execute any of the method steps in the above method. These program codes can be read from or written to one or more computer program products. The program code can be compressed, for example, in an appropriate form.

[0116] In summary, the present application provides a high-voltage interlock detection circuit, method and vehicle, wherein the high-voltage interlock detection circuit includes a high-voltage circuit; a signal source for outputting a detection signal; a sampling resistor, wherein the first end of the sampling resistor is connected to the first end of the signal source, and the second end of the sampling resistor is connected to the high-voltage circuit, so that when the detection signal is output, the high-voltage interlock state of the high-voltage circuit is detected by the voltage value of the sampling resistor. The signal source and the sampling resistor are directly connected to the high-voltage circuit, and the high-voltage interlock state of the high-voltage circuit can be detected by the voltage value of the sampling resistor when the detection signal of the signal source is output. By adopting the above circuit, the cost of high-voltage interlock detection can be reduced.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high voltage interlock detection circuit, characterized in that: include: High voltage circuit; A signal source, used for outputting a detection signal; A sampling resistor, wherein a first end of the sampling resistor is connected to a first end of the signal source, and a second end of the sampling resistor is connected to the high-voltage circuit, so that when the detection signal is output, a high-voltage interlocking state of the high-voltage circuit is detected by a voltage value of the sampling resistor.

2. The high voltage interlock detection circuit according to claim 1, characterized in that: The second end of the sampling resistor is connected to the high voltage loop through a coupling circuit.

3. The high voltage interlock detection circuit according to claim 2, characterized in that: The coupling circuit comprises a coupling resistor and a coupling capacitor, a first end of the coupling resistor is connected to the sampling resistor, and a second end of the coupling resistor is connected to a first end of the coupling capacitor; The second end of the coupling capacitor is connected to the high voltage loop.

4. The high voltage interlock detection circuit according to claim 3, characterized in that: The high-voltage loop includes a high-voltage busbar, the second end of the coupling capacitor is connected to the negative electrode of the high-voltage busbar in the high-voltage loop, and the second end of the signal source is grounded.

5. The high voltage interlock detection circuit according to claim 1, characterized in that: The high-voltage circuit includes a power battery, a high-voltage busbar and a high-voltage component module, the positive electrode of the power battery is connected to the positive electrode of the high-voltage busbar, the negative electrode of the power battery is connected to the negative electrode of the high-voltage busbar, and the power battery is used to supply power to the high-voltage component module; The input end of the high-voltage component module is connected to the positive electrode of the high-voltage bus, and the output end of the high-voltage component module is connected to the negative electrode of the high-voltage bus; The second end of the sampling resistor is connected to the output end of the high voltage component module.

6. The high voltage interlock detection circuit according to claim 5, characterized in that: The high-voltage component module includes at least two high-voltage components among a high-voltage compressor CMPR, a power system IPS, an electric drive system DCU and a heater PTC, and the at least two high-voltage components are connected to each other in parallel through the high-voltage bus.

7. The high voltage interlock detection circuit according to claim 6, characterized in that: Each of the high-voltage components comprises a first common-mode capacitor, a second common-mode capacitor and a differential-mode capacitor, wherein a first end of the first common-mode capacitor is connected to the positive electrode of the high-voltage bus, and a second end of the first common-mode capacitor is grounded; A first end of the second common-mode capacitor is connected to the negative electrode of the high-voltage bus, and a second end of the second common-mode capacitor is grounded; The first end of the differential mode capacitor is connected to the positive electrode of the high voltage bus, and the second end of the differential mode capacitor is connected to the negative electrode of the high voltage bus.

8. The high voltage interlock detection circuit according to claim 5, characterized in that: The high-voltage circuit further includes a first relay and a second relay, the positive electrode of the power battery is connected to the positive electrode of the high-voltage bus through the first relay, and the negative electrode of the power battery is connected to the negative electrode of the high-voltage bus through the second relay.

9. The high voltage interlock detection circuit according to any one of claims 1 to 8, characterized in that: The detection signal is a sine wave signal, and the signal source is a battery management system BMS.

10. A high voltage interlock detection method, characterized in that: Applied to the high voltage interlock detection circuit according to any one of claims 1 to 9, the method comprising: When the high-voltage circuit is turned on, controlling the signal source to output a detection signal; Obtaining a voltage value of the sampling resistor; Based on the voltage value, a high voltage interlock state of the high voltage circuit is determined.

11. The method according to claim 10, characterized in that The step of determining a high voltage interlocking state of the high voltage circuit based on the voltage value includes: If the voltage value is a preset voltage value, it is determined that all high-voltage components in the high-voltage circuit are in a high-voltage interlocking state.

12. The method according to claim 11, characterized in that The preset voltage value is calculated based on an equivalent circuit when all high-voltage components in the high-voltage circuit are in a high-voltage interlocking state, wherein the calculation method is: based on the output frequency of the detection signal, the impedance corresponding to each high-voltage component in the high-voltage circuit, the capacitance value of the first common-mode capacitor, and the capacitance value of the differential-mode capacitor, the port impedance of each high-voltage component is obtained; Based on the port impedance of each of the high-voltage components, a total impedance of the high-voltage circuit is obtained, wherein the total impedance is the sum of the impedances of all high-voltage components and the power battery in the high-voltage circuit when the detection signal is output; The preset voltage value is obtained based on the voltage value of the detection signal, the total impedance and the resistance value of the sampling resistor.

13. A vehicle, characterized in that: It comprises a vehicle body and the high-voltage interlock detection circuit according to any one of claims 1 to 9, wherein the high-voltage interlock detection circuit is arranged on the vehicle body.

14. A vehicle, characterized in that: comprising one or more processors and memory; One or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs are configured to execute the method of any one of claims 10-12.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program code, wherein when the program code is run, the method according to any one of claims 10 to 12 is executed.

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