Quick charge relay adhesion detection method and device, vehicle and storage medium

Abstract

The invention relates to a quick-charge relay adhesion detection method and device, a vehicle and a storage medium, and the method employs a sampling circuit and an insulation detection circuit which are connected in parallel, and a first quick-charge relay is disposed at a first parallel branch between the sampling circuit and the insulation detection circuit. The method comprises the following steps: if the first voltage of the sampling circuit is in a first preset voltage interval and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage of the insulation detection circuit, determining that the first fast charging relay is adhered, and if the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage of the insulation detection circuit, determining that the second fast charging relay is adhered; and if the first voltage is in a second preset voltage interval and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage of the insulation detection circuit, determining that the second fast charging relay is adhered. Therefore, the problem of negative voltage or positive voltage of the fast charging port in a conventional detection method is solved, an isolating switch needing to be added in the circuit is omitted, and the system cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method, device, vehicle and storage medium for detecting adhesion of a fast-charging relay. Background Art

[0002] Contact adhesion is a common fault in relays during use, usually caused by current, temperature changes or other factors caused by long-term operation. For safety reasons, the vehicle control system needs to perform adhesion detection on the fast charging relay to prevent safety problems caused by failure.

[0003] In the related art, the adhesion detection of electric vehicle fast charging relays usually adopts the method of arranging voltage detection resistors on both sides of the relay.

[0004] However, the related art methods easily lead to negative or positive voltage at the fast charging port, and an additional isolation switch needs to be added to the detection circuit, which increases the system cost. In addition, voltage spikes will be generated at the beginning of fast charging, affecting the accuracy of the detection results, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a fast-charging relay adhesion detection method, device, vehicle and storage medium to solve the problem of negative voltage or positive voltage appearing at the fast-charging port in conventional detection methods, and omits the isolation switch that needs to be added in the relay adhesion detection circuit, thereby reducing system costs.

[0006] The first aspect of the present application provides a fast charging relay adhesion detection method, the method adopts a sampling circuit and an insulation detection circuit connected in parallel, a first fast charging relay is arranged in a first parallel branch between the sampling circuit and the insulation detection circuit, and a second fast charging relay is arranged in a second parallel branch between the sampling circuit and the insulation detection circuit, wherein the method comprises the following steps:

[0007] Collecting a first voltage of the sampling circuit, a second voltage of the insulation detection circuit, a third voltage of the insulation detection circuit, a characteristic parameter of the first voltage, a characteristic parameter of the second voltage, and a characteristic parameter of the third voltage;

[0008] determining whether the first voltage is within a first preset voltage interval and whether a characteristic parameter of the first voltage is consistent with a characteristic parameter of the second voltage;

[0009] If the first voltage is within the first preset voltage interval, and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage, it is determined that the first fast charging relay is stuck; otherwise, it is determined whether the first voltage is within the second preset voltage interval, and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage;

[0010] If the first voltage is within the second preset voltage range and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage, it is determined that the second fast charging relay is stuck.

[0011] According to one embodiment of the present application, the characteristic parameters of the first voltage include the amplitude of the first voltage and the variation period of the first voltage, the characteristic parameters of the second voltage include the amplitude of the second voltage and the variation period of the second voltage, and the characteristic parameters of the second voltage include the amplitude of the third voltage and the variation period of the third voltage.

[0012] According to an embodiment of the present application, the determining whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage includes:

[0013] Determining whether the amplitude of the first voltage is consistent with the amplitude of the second voltage, or whether the variation period of the first voltage is consistent with the variation period of the second voltage;

[0014] If the amplitude of the first voltage is consistent with the amplitude of the second voltage, or the change period of the first voltage is consistent with the change period of the second voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage; otherwise, it is determined that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the second voltage.

[0015] According to an embodiment of the present application, determining whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage includes:

[0016] Determining whether the amplitude of the first voltage is consistent with the amplitude of the third voltage, or whether the variation period of the first voltage is consistent with the variation period of the third voltage;

[0017] If the amplitude of the first voltage is consistent with the amplitude of the third voltage, or the change period of the first voltage is consistent with the change period of the third voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; otherwise, it is determined that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage.

[0018] According to an embodiment of the present application, the determining whether the first voltage is the second preset voltage and whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage further includes:

[0019] If the first voltage is not in the second preset voltage interval, or the characteristic parameter of the first voltage is inconsistent with the characteristic parameter of the third voltage, the step of collecting the first voltage of the sampling circuit is performed again.

[0020] According to an embodiment of the present application, after determining that the first voltage is in the first preset voltage interval and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage, the method further includes:

[0021] determining whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage;

[0022] If the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage, it is determined that both the first fast charging relay and the second fast charging relay are stuck.

[0023] According to one embodiment of the present application, after determining that the first fast charging relay is stuck or the second fast charging relay is stuck, the method further includes:

[0024] Generate relay sticking reminder information;

[0025] An acoustic reminder and / or an optical reminder is performed according to the relay adhesion reminder information.

[0026] According to the fast-charge relay adhesion detection method provided in the embodiment of the present application, if the first voltage of the sampling circuit is in the first preset voltage interval, and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage of the insulation detection circuit, then it is determined that the first fast-charge relay is adhered; if the first voltage is in the second preset voltage interval, and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage of the insulation detection circuit, then it is determined that the second fast-charge relay is adhered. Thus, the problem of negative or positive voltage appearing at the fast-charge port in the conventional detection method is solved, and the isolation switch that needs to be added in the relay adhesion detection circuit is omitted, thereby reducing the system cost.

[0027] The second aspect of the present application provides a fast charging relay adhesion detection device, including: the device adopts a sampling circuit and an insulation detection circuit connected in parallel, a first fast charging relay is arranged in a first parallel branch between the sampling circuit and the insulation detection circuit, and a second fast charging relay is arranged in a second parallel branch between the sampling circuit and the insulation detection circuit, wherein the device includes:

[0028] An acquisition module, used for acquiring the first voltage of the sampling circuit, the second voltage of the insulation detection circuit, the third voltage of the insulation detection circuit, characteristic parameters of the first voltage, characteristic parameters of the second voltage and characteristic parameters of the third voltage;

[0029] a judging module, configured to judge whether the first voltage is within a first preset voltage interval, and whether a characteristic parameter of the first voltage is consistent with a characteristic parameter of the second voltage;

[0030] A first detection module, configured to determine that adhesion occurs in the first fast charging relay if the first voltage is within the first preset voltage interval and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage; otherwise, determine whether the first voltage is within the second preset voltage interval and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage;

[0031] The second detection module is used to determine that the second fast charging relay is stuck if the first voltage is in the second preset voltage interval and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage.

[0032] According to one embodiment of the present application, the characteristic parameters of the first voltage include the amplitude of the first voltage and the variation period of the first voltage, the characteristic parameters of the second voltage include the amplitude of the second voltage and the variation period of the second voltage, and the characteristic parameters of the second voltage include the amplitude of the third voltage and the variation period of the third voltage.

[0033] According to one embodiment of the present application, the judgment module is used to:

[0034] Determining whether the amplitude of the first voltage is consistent with the amplitude of the second voltage, or whether the variation period of the first voltage is consistent with the variation period of the second voltage;

[0035] If the amplitude of the first voltage is consistent with the amplitude of the second voltage, or the change period of the first voltage is consistent with the change period of the second voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage; otherwise, it is determined that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the second voltage.

[0036] According to one embodiment of the present application, the second detection module is used to:

[0037] Determining whether the amplitude of the first voltage is consistent with the amplitude of the third voltage, or whether the variation period of the first voltage is consistent with the variation period of the third voltage;

[0038] If the amplitude of the first voltage is consistent with the amplitude of the third voltage, or the change period of the first voltage is consistent with the change period of the third voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; otherwise, it is determined that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage.

[0039] According to one embodiment of the present application, the second detection module is further used to:

[0040] If the first voltage is not in the second preset voltage interval, or the characteristic parameter of the first voltage is inconsistent with the characteristic parameter of the third voltage, the step of collecting the first voltage of the sampling circuit is performed again.

[0041] According to an embodiment of the present application, after determining that the first voltage is in the first preset voltage interval and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage, the judgment module is further used to:

[0042] determining whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage;

[0043] If the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage, it is determined that both the first fast charging relay and the second fast charging relay are stuck.

[0044] According to one embodiment of the present application, after determining that the first fast charging relay is stuck or the second fast charging relay is stuck, the first detection module or the second detection module is further used to:

[0045] Generate relay sticking reminder information;

[0046] An acoustic reminder and / or an optical reminder is performed according to the relay adhesion reminder information.

[0047] According to the fast-charge relay adhesion detection device provided by the embodiment of the present application, if the first voltage of the sampling circuit is in the first preset voltage interval, and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage of the insulation detection circuit, then it is determined that the first fast-charge relay is adhered; if the first voltage is in the second preset voltage interval, and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage of the insulation detection circuit, then it is determined that the second fast-charge relay is adhered. Thus, the problem of negative or positive voltage appearing at the fast-charge port in the conventional detection method is solved, and the isolation switch that needs to be added in the relay adhesion detection circuit is omitted, thereby reducing the system cost.

[0048] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the fast charging relay adhesion detection method as described in the above embodiment.

[0049] The fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the fast-charging relay adhesion detection method as described in the above embodiment.

[0050] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0052] Figure 1 It is a structural schematic diagram of a fast charging relay adhesion detection circuit in the related art;

[0053] Figure 2 It is a structural schematic diagram of a fast charging relay adhesion detection circuit according to an embodiment of the present application;

[0054] Figure 3 A flowchart of a fast charging relay adhesion detection method provided according to an embodiment of the present application;

[0055] Figure 4 A circuit diagram of a fast charging relay adhesion detection circuit according to a specific embodiment of the present application;

[0056] Figure 5 is a flow chart of a fast charging relay adhesion detection method according to an embodiment of the present application;

[0057] Figure 6 is a block diagram of a fast charging relay adhesion detection device according to an embodiment of the present application;

[0058] Figure 7 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0060] The following describes the fast charging relay adhesion detection method, device, vehicle and storage medium of the embodiments of the present application with reference to the accompanying drawings.

[0061] Before introducing the fast charging relay adhesion detection method of the embodiment of the present application, a fast charging relay adhesion detection circuit in the related art and the fast charging relay adhesion detection circuit involved in the fast charging relay adhesion detection method of the present application are briefly introduced.

[0062] In related technologies, such as Figure 1 As shown, Figure 1 This is a technical solution for relay adhesion detection commonly used in current vehicles, where K1 is the main positive relay of the battery pack, K3 is the main negative relay of the battery pack, K2 is the pre-charge relay, K4 is the fast charge positive relay, and K5 is the fast charge negative relay. Therefore, when the fast charge positive relay K4 and the fast charge negative relay K5 of the vehicle are adhered at the same time, the fast charge port of the vehicle will be charged. By judging the voltages V1 and V2 at both ends of the fast charge positive relay K4, it can be judged whether the fast charge positive relay K4 is adhered.

[0063] In order to prevent the insulation detection voltage inside the vehicle from coupling to the fast charging port through the V2 path, a switch S1 is added to disconnect the V2 detection loop. However, due to the existence of the V2 detection loop, at the beginning of fast charging, the capacitance of the vehicle that performs relay adhesion detection will charge the Y capacitor of the charging pile through the V3 loop and the ground loop, thereby causing a voltage spike at the fast charging port.

[0064] In view of the conventional arrangement of voltage detection resistors on both sides of the relay for relay adhesion detection mentioned in the above background technology, negative voltage or positive voltage may appear at the fast charging port, and an additional isolation switch needs to be added to the detection circuit, which increases the system cost. In addition, the problem of voltage spikes will occur at the beginning of fast charging. The present application provides a fast charging relay adhesion detection circuit. The present application uses the insulation detection circuit of the whole vehicle and the sampling circuit added to the outside of the fast charging relay to perform relay adhesion detection. When the vehicle relay is not closed, the whole vehicle performs insulation detection, such as Figure 2 As shown, the external sampling circuit will detect the voltage waveform of the same period as the insulation detection, from which it can be judged that the relay has been stuck. Among them, C3 and C4 are the positive Y capacitor to ground of the fast charging port and the negative Y capacitor to ground of the fast charging port, respectively. In order to avoid the risk of fire and electric shock, the total energy of the positive Y capacitor to ground C3 and the negative Y capacitor to ground of the fast charging port C4 is set to be less than the preset threshold (such as 0.2J), and the positive Y capacitor to ground C3 and the negative Y capacitor to ground C4 of the fast charging port are arranged at the fast charging port, thereby forming a detection loop.

[0065] Specifically, if Figure 2As shown, when the fast charging positive relay K4 is stuck, V1 detects the periodic change of the vehicle DC current positive-to-ground Y capacitor C3 voltage, and the same period as the positive-to-ground voltage change. When the fast charging negative relay K5 is stuck, V1 detects the periodic change of the vehicle DC current negative-to-ground Y capacitor C4 voltage, and the same period as the negative-to-ground voltage change.

[0066] In order to facilitate those skilled in the art to understand the fast charging relay adhesion detection circuit of the present application more clearly and intuitively, the above detection circuit is specifically described below, and the implementation of the above detection circuit is linked with the insulation detection circuit, that is, the circuit using the balanced bridge method for insulation sampling has the function of implementing this method. For example, for ease of understanding, this application adopts the following method: Figure 3 The fast charging relay adhesion detection circuit shown, which also has a similar insulation detection circuit, is also within the protection scope of this application.

[0067] like Figure 3 As shown, K1 is a fast-charge positive relay, and K2 is a fast-charge negative relay; the first capacitor C1 is a Y capacitor on the positive side of the busbar of the electric vehicle, and the second capacitor C2 is a Y capacitor on the negative side of the busbar of the electric vehicle. The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the first switch S1 and the second switch S2 form an automobile insulation detection circuit, and the sixth resistor R6, the seventh resistor R7, the third capacitor C3 and the fourth capacitor C4 form a voltage-dividing sampling loop, wherein the third capacitor C3 is a positive-to-ground Y capacitor arranged at the fast-charge port, and the fourth capacitor C4 is a negative-to-ground Y capacitor arranged at the fast-charge port. When the fast-charge positive relay K1 is adhered, V1 detects a voltage of V0, and the voltage changes in the same cycle as the first capacitor C1. When the fast-charge negative relay K2 is adhered, V1 detects a voltage of V3, and the change of V3 is in the same cycle as the voltage change of the second capacitor C2.

[0068] The following describes the fast charging relay adhesion detection method of the present application.

[0069] Specifically, Figure 4 A flow chart of a fast charging relay adhesion detection method provided in an embodiment of the present application.

[0070] In this embodiment, the method adopts a sampling circuit and an insulation detection circuit connected in parallel, a first fast charging relay is arranged in a first parallel branch between the sampling circuit and the insulation detection circuit, and a second fast charging relay is arranged in a second parallel branch between the sampling circuit and the insulation detection circuit.

[0071] like Figure 4 As shown, the fast charging relay adhesion detection method includes the following steps:

[0072] In step S401, a first voltage of a sampling circuit, a second voltage of an insulation detection circuit, a third voltage of an insulation detection circuit, characteristic parameters of the first voltage, characteristic parameters of the second voltage, and characteristic parameters of the third voltage are collected.

[0073] Among them, the first voltage of the sampling circuit is the voltage of the sampling circuit added outside the fast charging relay, the second voltage of the insulation detection circuit can be a positive voltage to ground, the third voltage of the insulation detection circuit can be a negative voltage to ground, the characteristic parameters of the first voltage include the amplitude of the first voltage and the changing period of the first voltage, the characteristic parameters of the second voltage include the amplitude of the second voltage and the changing period of the second voltage, and the characteristic parameters of the second voltage include the amplitude of the third voltage and the changing period of the third voltage.

[0074] For example, Figure 3 As shown, the embodiment of the present application can collect the first voltage V1 of the voltage-dividing sampling loop, the second voltage V2 at both ends of the first capacitor C1 on the positive side of the DC bus, and the third voltage V3 at both ends of the second capacitor C2 on the negative side of the DC bus through the voltage sensor. After obtaining the first voltage V1, the second voltage V2, and the third voltage V3, by using the signal processing technology in the prior art to process the voltage signals of the first voltage V1, the second voltage V2, and the third voltage V3 respectively, the characteristic parameters such as the voltage amplitude, voltage waveform, and voltage change period corresponding to each voltage can be obtained respectively.

[0075] In step S402 , it is determined whether the first voltage is within a first preset voltage interval and whether a characteristic parameter of the first voltage is consistent with a characteristic parameter of the second voltage.

[0076] In step S403, if the first voltage is in the first preset voltage range and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage, it is determined that the first fast charging relay is stuck; otherwise, it is determined whether the first voltage is in the second preset voltage range and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage.

[0077] Among them, the first fast charging relay can be a fast charging positive relay; the second preset voltage interval and the second preset voltage interval can be voltage intervals pre-set by technical personnel in this field based on the specific operating conditions of the vehicle and the specification parameters of the fast charging relay, can be voltage intervals obtained through a limited number of experiments, or can be a voltage interval obtained through computer simulation, which is not specifically limited here.

[0078] It can be understood that when the vehicle's fast charging relay is working normally, the voltage values ​​and voltage characteristic parameters of the first voltage, the second voltage and the third voltage should be within the preset range. However, when the fast charging relay is stuck, its impedance characteristics change, which will cause the voltage waveform associated with it to change. By comparing the characteristic parameters of the first voltage with the characteristic parameters of the second voltage or the characteristic parameters of the third voltage, it can be determined that the fast charging positive relay or the fast charging negative relay is stuck.

[0079] Specifically, if the first voltage of the sampling circuit is in the first preset voltage range, and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage, it is determined that the first fast charging relay is stuck; if the first voltage is not in the first preset voltage range, or the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the second voltage, it is further determined whether the first voltage is in the second preset voltage range, and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage.

[0080] For example, Figure 3 As shown, when the fast charging positive relay K1 is stuck, the sixth resistor R6 and the seventh resistor R7 are connected in series, and after being connected in series with the negative-to-ground Y capacitor C4, they are connected in parallel with the positive-to-ground Y capacitor C3, and finally connected in parallel with the first capacitor C1. At this time, the first switch S1 is energized, and the voltage of the insulation detection circuit fluctuates. Therefore, the second voltage V2 at both ends of the first capacitor C1 fluctuates, and the voltage at the third capacitor C3 and the fourth capacitor C4 also fluctuates. At this time, the first voltage V1 collected in the voltage divider sampling loop fluctuates, and the voltage change of the first voltage V1 is in the same period as the voltage change of the second voltage V2.

[0081] Further, in some embodiments, determining whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage includes: determining whether the amplitude of the first voltage is consistent with the amplitude of the second voltage, or whether the change period of the first voltage is consistent with the change period of the second voltage; if the amplitude of the first voltage is consistent with the amplitude of the second voltage, or the change period of the first voltage is consistent with the change period of the second voltage, then determining that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage, otherwise, determining that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the second voltage.

[0082] The voltage amplitude refers to the maximum value or peak value of the voltage waveform, and the voltage variation period refers to the time required for the voltage waveform to complete a complete cycle.

[0083] Specifically, the embodiments of the present application can use an oscilloscope to measure the amplitude of the first voltage, the amplitude of the second voltage, the change period of the first voltage and the change period of the second voltage, and further determine whether the amplitude of the first voltage is consistent with the amplitude of the second voltage, or whether the change period of the first voltage is consistent with the change period of the second voltage. If the amplitude of the first voltage is consistent with the amplitude of the second voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage; or if the change period of the first voltage is consistent with the change period of the second voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage; if the amplitude of the first voltage is inconsistent with the amplitude of the second voltage, and the change period of the first voltage is inconsistent with the change period of the second voltage, it is determined that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the second voltage.

[0084] In addition, the embodiments of the present application can also determine whether the amplitude of the first voltage is consistent with the amplitude of the second voltage while determining whether the variation period of the first voltage is consistent with the variation period of the second voltage. If the amplitude of the first voltage is consistent with the amplitude of the second voltage and the variation period of the first voltage is consistent with the variation period of the second voltage, then it is also determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage.

[0085] In step S404, if the first voltage is in the second preset voltage interval and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage, it is determined that the second fast charging relay is stuck.

[0086] Among them, the second fast charging relay can be a fast charging negative relay.

[0087] Specifically, similar to the process of determining whether the second fast charging relay is stuck, when the first voltage is in the second preset voltage interval and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage, it is determined that the second fast charging relay is stuck.

[0088] For example, Figure 3 As shown, when the fast charging negative relay K2 is stuck, the sixth resistor R6 and the seventh resistor R7 are connected in series, and after being connected in series with the positive-to-ground Y capacitor C3, they are connected in parallel with the negative-to-ground Y capacitor C4, and finally connected in parallel with the second capacitor C2. At this time, the second switch S2 is energized, and the voltage of the insulation detection circuit fluctuates. Therefore, the third voltage V3 across the second capacitor C2 fluctuates, and the voltages at the third capacitor C3 and the fourth capacitor C4 also fluctuate. At this time, the first voltage V1 collected in the voltage divider sampling loop fluctuates, and the voltage change of the first voltage V1 is in the same period as the voltage change of the third voltage V3.

[0089] Further, in some embodiments, determining whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage includes: determining whether the amplitude of the first voltage is consistent with the amplitude of the third voltage, or whether the change period of the first voltage is consistent with the change period of the third voltage; if the amplitude of the first voltage is consistent with the amplitude of the third voltage, or the change period of the first voltage is consistent with the change period of the third voltage, then determining that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage, otherwise, determining that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage.

[0090] Specifically, the embodiments of the present application can use an oscilloscope to measure the amplitude of the first voltage, the amplitude of the third voltage, the change period of the first voltage and the change period of the third voltage, and further determine whether the amplitude of the first voltage is consistent with the amplitude of the third voltage, or whether the change period of the first voltage is consistent with the change period of the third voltage. If the amplitude of the first voltage is consistent with the amplitude of the third voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; or if the change period of the first voltage is consistent with the change period of the third voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; if the amplitude of the first voltage is inconsistent with the amplitude of the third voltage, and the change period of the first voltage is inconsistent with the change period of the third voltage, it is determined that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage.

[0091] In addition, the embodiment of the present application can also determine whether the variation period of the first voltage is consistent with the variation period of the third voltage while determining whether the amplitude of the first voltage is consistent with the amplitude of the third voltage. If the amplitude of the first voltage is consistent with the amplitude of the third voltage and the variation period of the first voltage is consistent with the variation period of the third voltage, then it is also determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage.

[0092] Furthermore, in some embodiments, determining whether the first voltage is the second preset voltage and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage also includes: if the first voltage is not in the second preset voltage interval, or the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage, re-executing the step of collecting the first voltage of the sampling circuit.

[0093] It can be understood that if the first voltage is not in the second preset voltage interval, or the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage, it means that neither the fast charging positive relay nor the fast charging negative relay of the current vehicle is stuck, that is, the fast charging positive relay and the fast charging negative relay are in normal working condition. In order to improve the robustness of fast charging relay adhesion detection and avoid misjudgment due to instantaneous interference or measurement errors, the embodiment of the present application re-executes the step of collecting the first voltage of the sampling circuit when the first voltage is not in the second preset voltage interval, or the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage, and continues to determine whether the fast charging relay of the current vehicle is stuck, thereby ensuring the accuracy and reliability of the detection.

[0094] Furthermore, in some embodiments, after determining that the first voltage is in the first preset voltage range and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage, it also includes: determining whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; if the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage, it is determined that both the first fast charging relay and the second fast charging relay are stuck.

[0095] It is understandable that although it is rare for a vehicle's fast-charging positive relay and fast-charging negative relay to stick at the same time, in actual applications, double relay sticking may cause more serious safety problems, such as overcurrent, overheating, etc. Therefore, it is necessary to detect the double relay sticking.

[0096] Specifically, after determining that the first voltage is in the first preset voltage interval and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage (i.e., the first fast-charging relay is stuck), it is further determined whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage. If the characteristic parameters of the first voltage are also consistent with the characteristic parameters of the third voltage, it means that both the first fast-charging relay and the second fast-charging relay are stuck, causing the electrical characteristics of the branches where the two relays are located to become similar or identical.

[0097] Furthermore, in some embodiments, after determining that the first fast charging relay is stuck, or the second fast charging relay is stuck, or both the first fast charging relay and the second fast charging relay are stuck, it also includes: generating relay adhesion reminder information; and performing acoustic reminders and / or optical reminders based on the relay adhesion reminder information.

[0098] Optionally, the reminder method of the present application can be an acoustic reminder device that controls the vehicle to emit an alarm sound, such as a beeping sound, or a voice broadcast, such as "The fast charging positive relay (and / or, the fast charging negative relay) is detected to be sticky, please check", etc. Reminders can also be made through an optical reminder device, such as flashing an indicator light in the vehicle, etc. The flashing type can be set in advance to correspond to the situation, or displayed through an indicator on the vehicle display.

[0099] During the specific implementation process, when it is detected that the first fast charging relay is stuck, or the second fast charging relay is stuck, or both the first fast charging relay and the second fast charging relay are stuck, a reminder can be given only by an acoustic reminder device or an optical reminder device, or by both the acoustic reminder device and the optical reminder device at the same time, without limitation.

[0100] For example, when any fast-charge relay is stuck, the reminder type of the embodiment of the present application can be an acoustic reminder device and an optical reminder device, such as a voice broadcast or a flashing indicator light. When the fast-charge positive relay and the fast-charge negative relay are stuck at the same time, the reminder type of the embodiment of the present application can be an acoustic reminder device and an optical reminder device at the same time, such as a voice broadcast and a flashing indicator light at the same time.

[0101] In order to facilitate those skilled in the art to more clearly and intuitively understand the fast charging relay adhesion detection method of the present application, the following is combined with Figure 3 and Figure 5 Provide specific instructions.

[0102] Specifically, if Figure 5 As shown, the fast charging relay adhesion detection method includes the following steps:

[0103] S501, start.

[0104] S502, start insulation detection.

[0105] S503, recovering the voltage V1 to obtain a sampled voltage Vf.

[0106] S504, determining whether the sampled voltage Vf satisfies the first preset voltage V0, and whether the sampled voltage Vf changes in the same cycle as the ground voltage V2 of the insulation detection circuit. If so, executing S505, otherwise, executing S506.

[0107] S505, determining that the fast charging positive relay is stuck.

[0108] S506, determining whether the sampled voltage Vf satisfies the second preset voltage V3, and whether the sampled voltage Vf changes in the same cycle as the negative ground voltage V4 of the insulation detection circuit. If so, execute S507, otherwise, execute S503.

[0109] S507, determining that the fast charging negative relay is stuck.

[0110] According to the fast-charge relay adhesion detection method proposed in the embodiment of the present application, if the first voltage of the sampling circuit is in the first preset voltage interval, and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage of the insulation detection circuit, then it is determined that the first fast-charge relay is adhered; if the first voltage is in the second preset voltage interval, and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage of the insulation detection circuit, then it is determined that the second fast-charge relay is adhered. Thus, the problem of negative or positive voltage appearing at the fast-charge port in the conventional detection method is solved, and the isolation switch that needs to be added in the relay adhesion detection circuit is omitted, thereby reducing the system cost.

[0111] Next, the fast charging relay adhesion detection device proposed in accordance with the embodiment of the present application will be described with reference to the accompanying drawings.

[0112] Figure 6 It is a block diagram of a fast charging relay adhesion detection device according to an embodiment of the present application.

[0113] In this embodiment, the device adopts a sampling circuit and an insulation detection circuit connected in parallel, the first fast charging relay is arranged in the first parallel branch between the sampling circuit and the insulation detection circuit, and the second fast charging relay is arranged in the second parallel branch between the sampling circuit and the insulation detection circuit.

[0114] like Figure 6 As shown, the fast charging relay adhesion detection device 10 includes: a collection module 100, a judgment module 200, a first detection module 300 and a second detection module 400.

[0115] Among them, the acquisition module 100 is used to acquire the first voltage of the sampling circuit, the second voltage of the insulation detection circuit, the third voltage of the insulation detection circuit, the characteristic parameters of the first voltage, the characteristic parameters of the second voltage and the characteristic parameters of the third voltage; the judgment module 200 is used to judge whether the first voltage is in a first preset voltage interval and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage; the first detection module 300 is used to judge whether the first fast charging relay is stuck if the first voltage is in the first preset voltage interval and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage, otherwise, judge whether the first voltage is in the second preset voltage interval and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; the second detection module 400 is used to judge whether the second fast charging relay is stuck if the first voltage is in the second preset voltage interval and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage.

[0116] Further, in some embodiments, the characteristic parameters of the first voltage include the amplitude of the first voltage and the variation period of the first voltage, the characteristic parameters of the second voltage include the amplitude of the second voltage and the variation period of the second voltage, and the characteristic parameters of the second voltage include the amplitude of the third voltage and the variation period of the third voltage.

[0117] Further, in some embodiments, the judgment module 200 is used to: judge whether the amplitude of the first voltage is inconsistent with the amplitude of the second voltage, and whether the change period of the first voltage is inconsistent with the change period of the second voltage; if the amplitude of the first voltage is inconsistent with the amplitude of the second voltage, and the change period of the first voltage is inconsistent with the change period of the second voltage, then judge that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the second voltage; otherwise, judge that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage.

[0118] Further, in some embodiments, the second detection module 400 is used to: determine whether the amplitude of the first voltage is inconsistent with the amplitude of the third voltage, and whether the change period of the first voltage is inconsistent with the change period of the third voltage; if the amplitude of the first voltage is inconsistent with the amplitude of the third voltage, and the change period of the first voltage is inconsistent with the change period of the third voltage, then determine that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage; otherwise, determine that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage.

[0119] Furthermore, in some embodiments, the second detection module 400 is further used to: if the first voltage is not in the second preset voltage interval, or the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage, then re-execute the step of collecting the first voltage of the sampling circuit.

[0120] Furthermore, in some embodiments, after determining that the first voltage is in the first preset voltage range and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage, the judgment module is also used to: determine whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; if the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage, it is determined that both the first fast charging relay and the second fast charging relay are stuck.

[0121] Furthermore, in some embodiments, after determining that the first fast charging relay is stuck or the second fast charging relay is stuck, the first detection module 300 or the second detection module is also used to: generate relay adhesion reminder information; and perform acoustic reminders and / or optical reminders based on the relay adhesion reminder information.

[0122] It should be noted that the aforementioned explanation of the embodiment of the fast charging relay adhesion detection method is also applicable to the fast charging relay adhesion detection device of this embodiment, and will not be repeated here.

[0123] According to the fast-charge relay adhesion detection device proposed in the embodiment of the present application, if the first voltage of the sampling circuit is in the first preset voltage interval, and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage of the insulation detection circuit, then it is determined that the first fast-charge relay is adhered; if the first voltage is in the second preset voltage interval, and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage of the insulation detection circuit, then it is determined that the second fast-charge relay is adhered. Thus, the problem of negative or positive voltage appearing at the fast-charge port in the conventional detection method is solved, and the isolation switch that needs to be added in the relay adhesion detection circuit is omitted, thereby reducing the system cost.

[0124] Figure 7 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0125] A memory 701 , a processor 702 , and a computer program stored in the memory 701 and executable on the processor 702 .

[0126] When the processor 702 executes the program, the fast charging relay adhesion detection method provided in the above embodiment is implemented.

[0127] Furthermore, the vehicle also includes:

[0128] The communication interface 703 is used for communication between the memory 701 and the processor 702 .

[0129] The memory 701 is used to store computer programs that can be executed on the processor 702 .

[0130] The memory 701 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0131] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0132] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can communicate with each other through an internal interface.

[0133] The processor 702 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0134] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned fast-charging relay adhesion detection method.

[0135] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0136] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0137] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0138] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0139] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0140] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0141] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0142] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for detecting adhesion of a fast charging relay, characterized in that: The method adopts a sampling circuit and an insulation detection circuit connected in parallel, a first fast charging relay is arranged in a first parallel branch between the sampling circuit and the insulation detection circuit, and a second fast charging relay is arranged in a second parallel branch between the sampling circuit and the insulation detection circuit, wherein the method comprises the following steps: Collecting a first voltage of the sampling circuit, a second voltage of the insulation detection circuit, a third voltage of the insulation detection circuit, a characteristic parameter of the first voltage, a characteristic parameter of the second voltage, and a characteristic parameter of the third voltage; determining whether the first voltage is within a first preset voltage interval and whether a characteristic parameter of the first voltage is consistent with a characteristic parameter of the second voltage; If the first voltage is within the first preset voltage interval, and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage, it is determined that the first fast charging relay is stuck; otherwise, it is determined whether the first voltage is within the second preset voltage interval, and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; If the first voltage is within the second preset voltage range and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage, it is determined that the second fast charging relay is stuck.

2. The method according to claim 1, characterized in that The characteristic parameters of the first voltage include the amplitude of the first voltage and the variation period of the first voltage, the characteristic parameters of the second voltage include the amplitude of the second voltage and the variation period of the second voltage, and the characteristic parameters of the second voltage include the amplitude of the third voltage and the variation period of the third voltage.

3. The method according to claim 2, characterized in that The determining whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage includes: Determining whether the amplitude of the first voltage is consistent with the amplitude of the second voltage, or whether the variation period of the first voltage is consistent with the variation period of the second voltage; If the amplitude of the first voltage is consistent with the amplitude of the second voltage, or the change period of the first voltage is consistent with the change period of the second voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage; otherwise, it is determined that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the second voltage.

4. The method according to claim 1 or 2, characterized in that: The determining whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage includes: Determining whether the amplitude of the first voltage is consistent with the amplitude of the third voltage, or whether the variation period of the first voltage is consistent with the variation period of the third voltage; If the amplitude of the first voltage is consistent with the amplitude of the third voltage, or the change period of the first voltage is consistent with the change period of the third voltage, it is determined that the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; otherwise, it is determined that the characteristic parameters of the first voltage are inconsistent with the characteristic parameters of the third voltage.

5. The method according to claim 1, characterized in that The determining whether the first voltage is the second preset voltage and whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage further includes: If the first voltage is not in the second preset voltage interval, or the characteristic parameter of the first voltage is inconsistent with the characteristic parameter of the third voltage, the step of collecting the first voltage of the sampling circuit is performed again.

6. The method according to claim 1, characterized in that After determining that the first voltage is within the first preset voltage interval and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the second voltage, the method further includes: determining whether the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage; If the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage, it is determined that both the first fast charging relay and the second fast charging relay are stuck.

7. The method according to claim 1 or 2, characterized in that: After determining that the first fast charging relay is stuck, or the second fast charging relay is stuck, the method further includes: Generate relay sticking reminder information; An acoustic reminder and / or an optical reminder is performed according to the relay adhesion reminder information.

8. A fast charging relay adhesion detection device, characterized in that: The device adopts a sampling circuit and an insulation detection circuit connected in parallel, a first fast charging relay is arranged in a first parallel branch between the sampling circuit and the insulation detection circuit, and a second fast charging relay is arranged in a second parallel branch between the sampling circuit and the insulation detection circuit, wherein the device comprises: An acquisition module, used for acquiring the first voltage of the sampling circuit, the second voltage of the insulation detection circuit, the third voltage of the insulation detection circuit, characteristic parameters of the first voltage, characteristic parameters of the second voltage and characteristic parameters of the third voltage; a judging module, configured to judge whether the first voltage is within a first preset voltage interval, and whether a characteristic parameter of the first voltage is consistent with a characteristic parameter of the second voltage; A first detection module, configured to determine that adhesion occurs in the first fast charging relay if the first voltage is within the first preset voltage interval and the characteristic parameters of the first voltage are consistent with the characteristic parameters of the second voltage; otherwise, determine whether the first voltage is within the second preset voltage interval and whether the characteristic parameters of the first voltage are consistent with the characteristic parameters of the third voltage; The second detection module is used to determine that the second fast charging relay is stuck if the first voltage is in the second preset voltage interval and the characteristic parameter of the first voltage is consistent with the characteristic parameter of the third voltage.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the fast-charging relay adhesion detection method as described in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement a fast charging relay adhesion detection method as described in any one of claims 1-6.

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