High-voltage relay state detection method, device and equipment and storage medium

Abstract

The invention relates to a high-voltage relay state detection method and device, equipment and a storage medium. When the state of the high-voltage relay is detected, the detection value is obtained through the state detection circuit connected with the to-be-detected high-voltage relay in parallel, the current state of the high-voltage relay is determined by comparing the detection value with the standard detection value, and whether an abnormal high-voltage relay exists or not can be determined through the current state. Therefore, the state of the relay can be rapidly and accurately detected, the high-voltage safety and reliability of the vehicle are improved, and the implementation cost is low.

Description

Technical Field

[0001] The present application relates to the field of relay state detection, and in particular to a high-voltage relay state detection method, device, equipment and storage medium. Background Art

[0002] With the increasing popularity of electric vehicles, people are paying more and more attention to their high-voltage safety. Among them, high-voltage relays are one of the most critical devices to ensure high-voltage safety. For example, the high-voltage distribution module integrates high-voltage relays such as pre-charge relays, positive / negative relays, and accessory relays. The power supply of various high-voltage electrical appliances in the vehicle is controlled by the on-off of each high-voltage relay. Therefore, the effective and rapid detection of the state of high-voltage relays plays a key role in ensuring the high-voltage safety of the vehicle. At present, the relay state detection method in the electric vehicle distribution system is mainly the voltage detection method. This method requires the vehicle to power on to detect the voltage inside and outside the relay, and then power off to detect the voltage inside and outside the relay. The relay state is determined based on the results of the two voltage detections. However, due to the influence of the inductive or capacitive load in the circuit, this method takes a long time for the voltage on the outside of the relay to rise or fall, resulting in a long judgment time and is more prone to misjudgment.

[0003] Therefore, how to detect the relay status more quickly and accurately is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0004] The present application provides a high-voltage relay state detection method, device, equipment and storage medium to quickly and accurately detect the relay state.

[0005] In a first aspect, the present application provides a high-voltage relay state detection method, comprising:

[0006] Determine the high voltage relay to be tested;

[0007] Acquire a detection value of the high-voltage relay; the detection value is acquired through a state detection circuit connected in parallel with the high-voltage relay;

[0008] Determine whether the detection value is a standard detection value; wherein the standard detection value is a detection value when the high-voltage relay is in a disconnected state;

[0009] If yes, it is determined that the current state of the high-voltage relay is an open state; if no, it is determined that the current state of the high-voltage relay is a closed state;

[0010] An abnormal high voltage relay is detected according to the current state of each high voltage relay.

[0011] Optionally, determining the high-voltage relay to be detected includes:

[0012] Detect whether the vehicle is in a low-voltage power-on state;

[0013] If so, the high-voltage relay that should be disconnected is used as the high-voltage relay to be detected.

[0014] Optionally, detecting an abnormal high-voltage relay according to a current state of each high-voltage relay comprises:

[0015] The high-voltage relay in the closed state is determined to be an abnormal high-voltage relay.

[0016] Optionally, after detecting an abnormal high-voltage relay according to the current state of each high-voltage relay, the method further includes:

[0017] Obtaining the relay coil voltage of the abnormally high voltage relay;

[0018] If there is no voltage across the relay coil, the fault is determined to be caused by the adhesion of the main contacts of the abnormally high-voltage relay; if the voltage across the relay coil is equal to the control voltage, the fault is determined to be caused by an abnormal control circuit.

[0019] Optionally, the detection method further comprises:

[0020] Fault information is generated according to the fault cause of the abnormally high voltage relay.

[0021] Optionally, obtaining the detection value of the high-voltage relay includes:

[0022] Closing the switch of the state detection circuit connected in parallel with the high-voltage relay; the state detection circuit comprises: a test resistor, the switch and a low-voltage isolation power supply connected in series in sequence;

[0023] A voltage value of the state detection circuit is obtained.

[0024] Optionally, determining whether the detection value is a standard detection value includes:

[0025] Determine whether the voltage value is the open circuit voltage of the low-voltage isolated power supply.

[0026] In a second aspect, the present application provides a high voltage relay state detection device, comprising:

[0027] A determination module, used for determining a high voltage relay to be detected;

[0028] A first acquisition module, used to acquire a detection value of the high-voltage relay; the detection value is acquired through a state detection circuit connected in parallel with the high-voltage relay;

[0029] A judging module, used to judge whether the detection value is a standard detection value; wherein the standard detection value is a detection value when the high-voltage relay is in a disconnected state;

[0030] A first determination module, configured to determine that the current state of the high-voltage relay is a disconnected state when the detection value is a standard detection value;

[0031] A second determination module, configured to determine that the current state of the high-voltage relay is a closed state when the detection value is not a standard detection value;

[0032] The detection module is used to detect abnormal high-voltage relays according to the current state of each high-voltage relay.

[0033] In a second aspect, the present application provides an electronic device, including:

[0034] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of the high-voltage relay state detection method through the computer program.

[0035] In a second aspect, the present application provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the steps of the above-mentioned high-voltage relay state detection method of the present application.

[0036] The above-mentioned technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art: when detecting the state of the high-voltage relay, the present application does not need to power on the vehicle for detection once and then power off the vehicle for detection again. When detecting the state of the high-voltage relay, the present application obtains the detection value through the state detection circuit connected in parallel with the high-voltage relay to be detected, and compares the detection value with the standard detection value to determine the current state of the high-voltage relay. Through the current state, it can be determined whether there is an abnormal high-voltage relay, thereby realizing fast and accurate detection of the relay state, improving the high-voltage safety and reliability of the vehicle, and the implementation cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0040] Figure 1 This is the schematic diagram of the high voltage relay state detection scheme in the traditional scheme;

[0041] Figure 2 This is a flow chart of high voltage relay status detection in the traditional solution;

[0042] Figure 3 A flow chart of a high voltage relay state detection method provided in an embodiment of the present application;

[0043] Figure 4 A flow chart of another high-voltage relay state detection method provided in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of the high-voltage relay state detection principle provided in an embodiment of the present application;

[0045] Figure 6 A schematic diagram of a state detection circuit provided in an embodiment of the present application;

[0046] Figure 7 A schematic diagram of another state detection circuit provided in an embodiment of the present application;

[0047] Figure 8 A schematic diagram of a power-on management process provided in an embodiment of the present application;

[0048] Fig. 9 A schematic diagram of a power-off management process provided in an embodiment of the present application;

[0049] Fig.10 A schematic diagram of a normal working management process provided in an embodiment of the present application;

[0050] Fig.11 A schematic diagram of the structure of a high-voltage relay state detection device provided in an embodiment of the present application;

[0051] Fig.12 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] See also Figure 1 , is a schematic diagram of the high-voltage relay state detection scheme in the traditional scheme, where 11 is the power battery, 12 is the pre-charging resistor, 13 is the pre-charging relay, 14 is the main positive relay, 15 is the load, and 16 is the voltage detection module. Figure 2 , Figure 2 This is a flow chart of high voltage relay status detection in the traditional solution. Figure 1 and Figure 2 It can be seen that the traditional solution needs to power off and then power on each time to accurately determine the state of the relay. This method has the problem of long detection time and easy misjudgment. In addition, this method cannot accurately locate the specific fault point when detecting the state of the pre-charge relay and the main positive relay. In addition, this method requires adding an auxiliary structure to detect the state of the main contact inside the relay, which is costly to implement.

[0053] Therefore, in this embodiment, a high-voltage relay state detection method, device, equipment and storage medium are provided to achieve fast and accurate detection of relay state.

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0055] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0056] See also Figure 3 , Figure 3 A flow chart of a high-voltage relay state detection method provided in an embodiment of the present application, the method specifically comprises the following steps:

[0057] S101, determining a high voltage relay to be detected;

[0058] In this embodiment, the high-voltage relay refers to a relay integrated in the high-voltage circuit, such as: a pre-charge relay, a positive / negative relay, an accessory relay, etc. integrated in the high-voltage power distribution module. The high-voltage relay to be detected in this solution can be customized according to actual conditions, and any high-voltage relay that needs to be detected can be called a high-voltage relay to be detected.

[0059] S102, obtaining a detection value of a high-voltage relay; the detection value is obtained through a state detection circuit connected in parallel with the high-voltage relay;

[0060] In the scheme, when the state of the high-voltage relay is detected, it is mainly detected by a state detection circuit connected in parallel with the high-voltage relay. The state detection circuit can obtain the detection value of the high-voltage relay in the current state. The detection value can be a voltage value or a current value. The specific type can be determined according to the type of the state detection circuit. It should be noted that this scheme does not specifically limit the state detection circuit, as long as it can achieve the acquisition of the detection value of the high-voltage relay.

[0061] S103, judging whether the detection value is a standard detection value; wherein the standard detection value is a detection value when the high voltage relay is in a disconnected state;

[0062] If yes, execute S104; if no, execute S105;

[0063] S104, determining that the current state of the high voltage relay is a disconnected state;

[0064] S105, determining that the current state of the high voltage relay is a closed state;

[0065] S106. Detect abnormal high-voltage relays according to the current state of each high-voltage relay.

[0066] It should be noted that the current state is used to indicate whether the high-voltage relay is currently closed, so the current state includes: closed state and open state. In addition, the detection value obtained by the state detection circuit when the high-voltage relay is in the open state is different from the detection value obtained when the high-voltage relay is in the closed state. Therefore, this scheme refers to the detection value obtained when the high-voltage relay is in the open state as the standard detection value. By comparing the detection value obtained when the high-voltage relay is in the current state with the standard detection value, the state of the high-voltage relay can be detected. For example: if the state detection circuit is a voltage detection circuit, the voltage value of the high-voltage relay in the open state is V1, that is: V1 is the standard detection value; if the voltage detection value of the high-voltage relay in the current state obtained by the state detection circuit is V2, if V1=V2, it means that the high-voltage relay is in the open state, and if V1≠V2, it means that the high-voltage relay is in the closed state.

[0067] Furthermore, after determining the current state of the high-voltage relay, an abnormal high-voltage relay can be detected according to the current state; in this embodiment, a high-voltage relay whose current state does not conform to the standard state is called an abnormal high-voltage relay. For example: if the current vehicle is in a low-voltage power-on state, then the standard state of each high-voltage relay should be a disconnected state. If it is detected that the current state of a high-voltage relay is a closed state, then the high-voltage relay in the closed state is an abnormal high-voltage relay; or, if the current vehicle is in a high-voltage power-on state, then the standard state of each high-voltage relay should be a closed state. If it is detected that the current state of a high-voltage relay is a disconnected state, then the high-voltage relay in the disconnected state is an abnormal high-voltage relay.

[0068] From the above, it can be seen that when detecting the state of the high-voltage relay, the present application does not need to power on the vehicle for detection once and then power off for detection again. When detecting the state of the high-voltage relay, the present application obtains the detection value through the state detection circuit connected in parallel with the high-voltage relay to be detected, and compares the detection value with the standard detection value to determine the current state of the high-voltage relay. The current state can be used to determine whether there is an abnormal high-voltage relay, that is: this solution can detect whether the high-voltage relay is abnormal in real time, improve system safety; and this solution has a short detection time and high reliability of results. Therefore, this solution can realize fast and accurate detection of the relay state, improve the safety and reliability of the vehicle high voltage, and the implementation cost is low.

[0069] See also Figure 4 , Figure 4 Another high-voltage relay state detection method flow chart provided in an embodiment of the present application. The method specifically comprises the following steps:

[0070] S201, determining a high voltage relay to be detected;

[0071] S202, closing a switch of a state detection circuit connected in parallel with the high-voltage relay; the state detection circuit comprises: a test resistor, the switch and a low-voltage isolation power supply connected in series in sequence;

[0072] S203, obtaining a voltage value of a status detection circuit;

[0073] S204, determining whether the voltage value is the open circuit voltage of the low voltage isolated power supply;

[0074] If yes, execute S205; if no, execute S206;

[0075] S205, determining that the current state of the high voltage relay is a disconnected state;

[0076] S206, determining that the current state of the high voltage relay is a closed state;

[0077] S207. Detect abnormal high-voltage relays according to the current state of each high-voltage relay.

[0078] In this embodiment, the state detection circuit is specifically used to obtain the voltage value of the high-voltage relay in different states. Figure 5 , Figure 5 A schematic diagram of the high-voltage relay state detection principle provided by an embodiment of the present invention. Among them, 21 is a power battery, 22 is a pre-charging resistor, 23 is a pre-charging relay, 24 is a main positive relay, 25 is a load, 26 is a pre-charging relay state detection circuit, 27 is a main positive relay state detection circuit, 28 is a pre-charging relay coil, 29 is a voltage detection circuit for the pre-charging relay coil, 210 is a main positive relay coil, 211 is a voltage detection circuit for the main positive relay coil, and 212 is a main loop capacitor. Figure 5 It can be seen that the pre-charging relay 23 and the main positive relay 24 are high voltage relays, the state detection circuit 26 is used to detect the state of the pre-charging relay 23 , and the state detection circuit 27 is used to detect the state of the main positive relay 24 .

[0079] It should be noted that the state detection circuit in this embodiment includes at least: a test resistor, a switch and a low-voltage isolated power supply connected in series in sequence, wherein the number of test resistors is not specifically limited in this embodiment, and can be one, two, or more than two.

[0080] See also Figure 6 , Figure 6 Schematic diagram of a state detection circuit provided in an embodiment of the present invention. The circuit in the dotted box is the state detection circuit, which can be Figure 5 The state detection circuit 26 of the pre-charge relay can also be Figure 5 The state detection circuit 27 of the main positive relay in the middle; wherein 31 is a unidirectional diode, 32 is a test resistor R1, 33 is a test resistor R2, 34 is a switch, 35 is a low-voltage isolation power supply, 36 is a voltage detection point, 37 is a relay main contact, and the relay main contact 37 can be Figure 5 The main contact of the pre-charge relay 23 can also be Figure 5 The main contact of the main positive relay 24 in the middle. During the detection, the switch 34 is closed to detect the voltage at the voltage detection point 36. When the main contact 37 of the relay is disconnected, the voltage at the voltage detection point 36 should be the open-circuit voltage of the low-voltage isolated power supply. Therefore, this embodiment uses the open-circuit voltage of the low-voltage isolated power supply as the standard detection value; when the main contact of the relay is closed, the detection circuit forms a loop, and the voltage at the voltage detection point 36 is the voltage drop of the test resistor R2, wherein the unidirectional diode 31 can prevent the high-voltage system voltage from entering the detection circuit, causing damage to the components or interfering with the detection results.

[0081] See also Figure 5 and Figure 6 , when detecting the states of the pre-filling relay 23 and the main positive relay 24, the voltage value of the pre-filling relay 23 can be obtained through the state detection circuit 26, and the voltage value of the main positive relay 24 can be obtained through the state detection circuit 27, and the relay state can be determined by comparing with the open circuit voltage of the low-voltage isolation power supply. Since the state detection process of the pre-filling relay 23 and the main positive relay 24 is the same, only the analysis of the state of the pre-filling relay 23 is used as an example for explanation: if it is detected that the pre-filling relay 23 is in a state that should be disconnected, it is necessary to close the switch 34 of the state detection circuit 26, and obtain the voltage value of the detection point 36 of the state detection circuit to determine whether the voltage value is the open circuit voltage of the low-voltage isolation power supply; if so, it means that the pre-filling relay 23 is in a disconnected state; if the voltage value is not the open circuit voltage of the low-voltage isolation power supply, but a pre-set closing threshold voltage, it means that the pre-filling relay 23 is in a closed state; wherein, the closing threshold voltage can be adjusted according to the different state detection circuits, such as in this embodiment, the closing threshold voltage is the voltage drop of the test resistor R2.

[0082] It should be noted that this embodiment is only described by taking the example of the state detection circuit determining the state of the high-voltage relay by obtaining the voltage value. In actual applications, the state detection circuit can also determine the state of the high-voltage relay by obtaining the current value. Figure 7 , Figure 7 Another state detection circuit schematic diagram provided by an embodiment of the present invention, wherein 41 is a unidirectional diode, 42 is a test resistor, 43 is a current sensor, 44 is a switch, 45 is a low-voltage isolation power supply, and 46 is a relay main contact. The state detection circuit obtains the current value to determine the state of the high-voltage relay in the same way as the voltage value. It is also necessary to determine the standard current value and then compare the detected current value with the standard current value to determine the state of the high-voltage relay.

[0083] In summary, this solution can achieve real-time detection of the high-voltage relay state by obtaining the voltage value, thereby improving system safety; in addition, this solution has a short detection time and high reliability of results. Therefore, this solution can achieve fast and accurate detection of the relay state, improve the safety and reliability of the vehicle's high voltage, and has a low implementation cost.

[0084] In this embodiment, in order to more accurately detect whether the high-voltage relay is abnormal, when determining the high-voltage relay to be detected, it can be specifically detected whether the vehicle is in a low-voltage power-on state; if so, the high-voltage relay that should be disconnected is used as the high-voltage relay to be detected. Accordingly, when detecting abnormal high-voltage relays according to the current state of each high-voltage relay, this embodiment can directly determine that the high-voltage relay in the closed state is an abnormal high-voltage relay.

[0085] Specifically, when detecting the status of the high-voltage relay, this solution may include three processes, namely, the power-on management process, the power-off management process, and the normal working management process; wherein, the power-on management process refers to the detection of the high-voltage relay that should be disconnected after the vehicle changes from the power-off state to the low-voltage power-on state, and the power-off management process refers to the detection of the high-voltage relay that should be disconnected when the vehicle is in the low-voltage power-on state after the vehicle is powered on from the high-voltage power-on state. Through the power-on management process and the power-off management process, the status of the high-voltage relay can be detected in real time before and after the vehicle is powered on at high voltage to ensure the safety and reliability of the vehicle's high voltage. In order to ensure the safety of the vehicle's power-on, the power-on management process needs to be executed before each power-on of the vehicle; at the same time, in order to increase the accuracy and reliability of the detection, it can also be set to execute the power-off management process after each power-off. The normal management process refers to the normal working state of the vehicle after the high voltage is powered on. At this time, the high-voltage relay in the distribution system should be in a closed state or a disconnected state according to the instructions of the vehicle controller. If the current high-voltage relay should be in a closed state, the standard state should be a closed state. If the current state of the high-voltage relay is detected to be a disconnected state, it means that the high-voltage relay is an abnormal high-voltage relay. The normal working management process can be periodically detected according to the pre-set detection cycle.

[0086] Among them, the "should be disconnected state" in this embodiment refers to a special state in which the high-voltage relay should be in a disconnected state. In the "should be disconnected state", if the high-voltage relay has no faults, then the "should be disconnected state" is the disconnected state. If the high-voltage relay has faults such as adhesion, then the "should be disconnected state" is the closed state. Therefore, when this embodiment detects abnormal high-voltage relays according to the current state of each high-voltage relay, if the high-voltage relay to be detected is a high-voltage relay in a "should be disconnected" state, then the high-voltage relay in a "closed" state can be directly determined to be an abnormal high-voltage relay. For example: the vehicle is in a normal power-off state. At this time, all high-voltage relays in the power distribution system should be in a disconnected state. If the vehicle is powered on at a low voltage at this time, and after executing the detection method described in this scheme, it is found that the high-voltage relay is in a closed state, then the high-voltage relay in a closed state can be called an abnormal high-voltage relay.

[0087] In this embodiment, in order to determine the cause of the high-voltage relay failure, this solution performs fault location by obtaining the relay coil voltage. Therefore, after detecting abnormal high-voltage relays according to the current state of each high-voltage relay, this solution also includes the following steps:

[0088] Obtaining the relay coil voltage of the abnormally high voltage relay;

[0089] If there is no voltage across the relay coil, the cause of the fault is determined to be the adhesion of the main contacts of the abnormal high-voltage relay; if the voltage across the relay coil is equal to the control voltage, the cause of the fault is determined to be an abnormal control circuit;

[0090] Fault information is generated based on the fault cause of the abnormal high voltage relay.

[0091] Specifically, if this scheme detects the presence of a high-voltage relay in an abnormal state, the voltage on both sides of the relay coil is obtained through the relay coil voltage detection circuit corresponding to the high-voltage relay. If there is no voltage at both ends of the relay coil, it is determined that the main contacts of the relay itself are abnormally adhered, and the system reports fault information. The fault information includes: a fault code corresponding to the fault cause of abnormal adhesion of the main contacts of the relay; if the voltage at both ends of the relay coil is equal to the control voltage, it is determined that the control circuit is abnormal, and the system reports fault information, which includes: a fault code corresponding to the fault cause of abnormal control circuit.

[0092] See also Figure 5 The schematic diagram of the high-voltage relay state detection principle shown in the figure, wherein 23 is a pre-charge relay, 23 is a pre-charge relay, 28 is a pre-charge relay coil, 29 is a voltage detection circuit of the pre-charge relay coil, 24 is a main positive relay, 210 is a main positive relay coil, and 211 is a voltage detection circuit of the main positive relay coil. That is, if the pre-charge relay 23 is detected to be in an abnormal state, the voltage on both sides of the pre-charge relay coil 28 is detected by the voltage detection circuit 29, and if the main positive relay 24 is detected to be in an abnormal state, the voltage on both sides of the main positive relay coil 210 is detected by the voltage detection circuit 211 to locate the fault.

[0093] In this embodiment, a specific power-on management process diagram is provided. In this embodiment, obtaining a voltage value to determine a relay state is used as an example for explanation. Figure 8 , the process specifically includes the following steps:

[0094] S301, the electric vehicle is in a normal power-off state, and the high-voltage relays in the power distribution system are all in a disconnected state;

[0095] S302, the key is turned to ACC or ON position, and the vehicle is powered on;

[0096] S303, the control system is powered on at low voltage; wherein the control system is specifically a PDU (Power Distribution Unit) power distribution system;

[0097] S304, entering the relay monitoring process, closing the switches of each relay status detection circuit;

[0098] S305, detecting the voltage at the voltage detection point, and determining whether the voltage at the detection point is the open-circuit voltage of the low-voltage isolated power supply;

[0099] If yes, execute S306; if no, execute S307;

[0100] S306, determining that the high-voltage relay is in a normal state and is in a disconnected state, and closing each high-voltage relay according to a relevant control strategy to complete the vehicle high-voltage power-on process;

[0101] S307, determining that the high voltage relay is in an abnormal state and is in a closed state;

[0102] S308, detecting abnormal relay coil voltage. If there is no voltage at both ends of the relay coil, it is determined that the main contacts of the relay itself are abnormally adhered. If the voltage at both ends of the relay coil is equal to the control voltage, it is determined that the control circuit is abnormal.

[0103] S309. The system reports a fault code corresponding to the fault cause.

[0104] In this embodiment, a specific power-off management process diagram is provided. In this embodiment, obtaining a voltage value to determine a relay state is used as an example for explanation. Fig. 9 , the process specifically includes the following steps:

[0105] S401, the electric vehicle is in a normal power-on state;

[0106] S402, the key is turned from the ON position to the OFF position, and the vehicle is powered off;

[0107] S403, after the VCU (Vehicle Control Unit) determines that the high voltage power-off condition is met, it sends a disconnection instruction to each relay, and each high voltage relay disconnects the main contact according to the VCU instruction;

[0108] S404, entering the relay monitoring process, closing the switches of each relay status detection circuit;

[0109] S405, detecting the voltage at the voltage detection point, and determining whether the voltage at the detection point is the open-circuit voltage of the low-voltage isolated power supply;

[0110] If yes, execute S406; if no, execute S407;

[0111] S406, determine that the high-voltage relay is in a normal state and is in a disconnected state; disconnect the switches of the relay state detection circuits, and power off the control board at a low voltage, and the normal power-off ends.

[0112] S407, determining that the relay state is abnormal and is in a closed state;

[0113] S408, detecting abnormal relay coil voltage. If there is no voltage at both ends of the relay coil, it is determined that the main contacts of the relay itself are abnormally adhered. If the voltage at both ends of the relay coil is equal to the control voltage, it is determined that the control circuit is abnormal.

[0114] S409, the system reports a fault code corresponding to the fault cause;

[0115] S410, after the VCU stores the relevant fault code, the switches of the relay status detection circuits are disconnected, the control board is powered off at low voltage, and the abnormal power-off ends.

[0116] In this embodiment, a specific normal working management process diagram is provided. In this embodiment, obtaining a voltage value to determine a relay state is used as an example for explanation. Fig.10 , the process specifically includes the following steps:

[0117] S501, the electric vehicle system is powered on and works normally;

[0118] S502, close the relay state detection circuit switch;

[0119] S503, detecting the voltage at the voltage detection point, and determining whether the voltage at the detection point is the open-circuit voltage of the low-voltage isolated power supply;

[0120] If yes, execute S504; if no, execute S505;

[0121] S504, the relay is in the disconnected state;

[0122] S505, the relay is in a closed state;

[0123] S506. Detect abnormal high voltage relays according to the current standard state.

[0124] From the above, it can be seen that when this solution detects the status of the high-voltage relay, it only needs to introduce a relay status detection circuit and a relay coil voltage detection circuit at both ends of each high-voltage relay. Before and after the vehicle is powered on and after the vehicle is started, the relay status detection circuit can be used to monitor the status of the relay main contacts in real time, and then the cause of the fault can be accurately located based on the relay coil voltage detection result, specifically whether it is a relay body fault or a control circuit fault, which is convenient for maintenance personnel to quickly locate the fault point and take appropriate maintenance measures.

[0125] See also Fig.11 , Fig.11 A schematic diagram of the structure of a high-voltage relay state detection device provided in an embodiment of the present application, the device specifically comprises:

[0126] A determination module 41, used to determine a high voltage relay to be detected;

[0127] A first acquisition module 42, used to acquire a detection value of the high-voltage relay; the detection value is acquired through a state detection circuit connected in parallel with the high-voltage relay;

[0128] The judging module 43 is used to judge whether the detection value is a standard detection value; wherein the standard detection value is the detection value when the high voltage relay is in a disconnected state;

[0129] A first determination module 44, configured to determine that the current state of the high voltage relay is a disconnected state when the detection value is a standard detection value;

[0130] A second determination module 45 is used to determine that the current state of the high-voltage relay is a closed state when the detection value is not a standard detection value;

[0131] The detection module 46 is used to detect abnormal high-voltage relays according to the current state of each high-voltage relay.

[0132] As an optional embodiment, the determination module is specifically used to: detect whether the vehicle is in a low-voltage power-on state; if so, use the high-voltage relay that is in a disconnected state as the high-voltage relay to be detected.

[0133] As an optional embodiment, the detection module is specifically used to determine that the high-voltage relay in a closed state is an abnormal high-voltage relay.

[0134] As an optional embodiment, the high-voltage relay state detection device further includes:

[0135] A second acquisition module is used to acquire the relay coil voltage of the abnormally high voltage relay;

[0136] The third determination module is used to determine that the fault cause is the adhesion of the main contacts of the abnormal high-voltage relay when there is no voltage at both ends of the relay coil; and to determine that the fault cause is the abnormal control circuit when the voltage at both ends of the relay coil is equal to the control voltage.

[0137] As an optional embodiment, the high-voltage relay state detection device further includes:

[0138] The fault information generating module is used to generate fault information according to the fault cause of the abnormal high voltage relay.

[0139] As an optional embodiment, the first acquisition module includes:

[0140] A closing unit, used to close a switch of a state detection circuit connected in parallel with the high-voltage relay; the state detection circuit comprises: a test resistor, the switch and a low-voltage isolation power supply connected in series in sequence;

[0141] An acquisition unit is used to acquire a voltage value of the state detection circuit.

[0142] As an optional embodiment, the judgment module is specifically used to: judge whether the voltage value is the open-circuit voltage of the low-voltage isolated power supply.

[0143] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0144] See also Fig.12 , Fig.12 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application, the electronic device specifically includes:

[0145] A memory 51, a processor 52 and a computer program stored in the memory and executable on the processor. The processor executes the steps of the high-voltage relay state detection method described in any of the above method embodiments through the computer program.

[0146] The electronic device further includes a communication interface 53 and a communication bus 54. The communication interface 53 is used to realize data communication between the electronic device and other devices. The memory 51, the processor 52, and the communication interface 53 communicate with each other through the communication bus 54.

[0147] It should be noted that the electronic device may be a device installed on a vehicle, such as a device installed on an electric vehicle. The memory 51 and the processor 52 may be devices in a vehicle control unit VCU, and the processor 52 detects the state of the high-voltage relay by executing a computer program in the memory 51.

[0148] certainly, Fig.12 The structure of the electronic device shown does not constitute a limitation on the electronic device in the embodiments of the present application. In actual applications, the electronic device may include Fig.12 More or fewer components than shown, or combinations of certain components.

[0149] In another exemplary embodiment, a computer storage medium is also provided, and when the program instructions are executed by a processor, the steps of the high-voltage relay state detection method described in any of the above method embodiments are implemented. The storage medium may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0150] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0151] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0152] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for detecting a high voltage relay state, characterized in that: include: Determine the high voltage relay to be tested; Obtaining a detection value of the high voltage relay; The detection value is obtained by a state detection circuit connected in parallel with the high-voltage relay; Determine whether the detection value is a standard detection value; wherein the standard detection value is a detection value when the high-voltage relay is in a disconnected state; If yes, it is determined that the current state of the high-voltage relay is an open state; if no, it is determined that the current state of the high-voltage relay is a closed state; An abnormal high voltage relay is detected according to the current state of each high voltage relay.

2. The high voltage relay state detection method according to claim 1, characterized in that: The step of determining the high-voltage relay to be detected comprises: Detect whether the vehicle is in a low-voltage power-on state; If so, the high-voltage relay that should be disconnected is used as the high-voltage relay to be detected.

3. The high voltage relay state detection method according to claim 2, characterized in that: The detecting of abnormal high voltage relays according to the current state of each high voltage relay comprises: The high-voltage relay in the closed state is determined to be an abnormal high-voltage relay.

4. The high voltage relay state detection method according to claim 1, characterized in that: After detecting abnormal high voltage relays according to the current state of each high voltage relay, it also includes: Obtaining the relay coil voltage of the abnormally high voltage relay; If there is no voltage across the relay coil, the fault is determined to be caused by the adhesion of the main contacts of the abnormally high-voltage relay; if the voltage across the relay coil is equal to the control voltage, the fault is determined to be caused by an abnormal control circuit.

5. The high voltage relay state detection method according to claim 4, characterized in that: The detection method further comprises: Fault information is generated according to the fault cause of the abnormally high voltage relay.

6. The high voltage relay state detection method according to any one of claims 1 to 5, characterized in that: The obtaining of the detection value of the high voltage relay comprises: Closing the switch of the state detection circuit connected in parallel with the high-voltage relay; the state detection circuit comprises: a test resistor, the switch and a low-voltage isolation power supply connected in series in sequence; A voltage value of the state detection circuit is obtained.

7. The high voltage relay state detection method according to claim 6, characterized in that: The determining whether the detection value is a standard detection value includes: Determine whether the voltage value is the open circuit voltage of the low-voltage isolated power supply.

8. A high voltage relay state detection device, characterized in that: include: A determination module, used for determining a high voltage relay to be detected; A first acquisition module, used to acquire a detection value of the high voltage relay; The detection value is obtained by a state detection circuit connected in parallel with the high-voltage relay; A judging module, used to judge whether the detection value is a standard detection value; wherein the standard detection value is a detection value when the high-voltage relay is in a disconnected state; A first determination module, configured to determine that the current state of the high-voltage relay is a disconnected state when the detection value is a standard detection value; A second determination module, configured to determine that the current state of the high-voltage relay is a closed state when the detection value is not a standard detection value; The detection module is used to detect abnormal high-voltage relays according to the current state of each high-voltage relay.

9. An electronic device, 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 steps of the high-voltage relay state detection method according to any one of claims 1 to 7 through the computer program.

10. A computer storage medium, characterized in that: The computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the steps of the high-voltage relay state detection method described in any one of claims 1 to 7 of the present application.

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