Relay adhesion detection device, method and vehicle

Abstract

The present disclosure relates to a relay adhesion detection device, method and vehicle, and relates to the field of relay technology. The device includes: a controller for controlling the conduction or disconnection of a branch where a first switch component is located through a first switch component; a controller for controlling the conduction or disconnection of a branch where a second switch component is located through a second switch component; and a controller for obtaining a first voltage across the second relay branch when a vehicle power-on command is received, supplying power to the first switch component when the first voltage is equal to a first preset voltage threshold to facilitate the conduction of the branch where the first switch component is located, and obtaining a second voltage across the main negative relay, and determining whether there is a relay that is adhered between the load relay and the main negative relay based on the second voltage.

Description

Technical Field

[0001] The present disclosure relates to the technical field of relays, and in particular, to a relay adhesion detection device, method and vehicle. Background Art

[0002] With the rapid development of the new energy industry, new energy vehicle technology is developing rapidly with the advantages of low pollution and low energy consumption. At the same time, the market has higher and higher requirements for the safety performance of new energy vehicles. Whether it is a plug-in hybrid vehicle or a pure electric vehicle, the high-voltage battery pack is its main power output source, and its total voltage is generally high. The relay is a switch in the high-voltage safety system of new energy vehicles and is an extremely important device. The relay may stick when it is closed or disconnected, and the relay working in a sticky state may cause safety accidents and affect the safety of people on the vehicle.

[0003] At present, the detection of the main positive relay and the pre-charge relay can only determine whether one of the main positive relay and the pre-charge relay is stuck based on the voltage at both ends of the main positive relay, but it is impossible to determine which relay is stuck. In addition, the sticking of the main negative relay and the heating relay requires closing and disconnecting each relay multiple times after power-on to be detected, which makes the entire detection cycle longer and the detection process more complicated. The current detection method cannot accurately determine the relay that is stuck, and the entire detection cycle is relatively long. Summary of the invention

[0004] In order to solve the above problems, the present disclosure provides a relay adhesion detection device, method and vehicle.

[0005] In a first aspect, the present disclosure provides a relay adhesion detection device, the device comprising: a power supply circuit, a first switch component, a second switch component and a controller, the power supply circuit comprising a power supply, a main positive relay, a main negative relay, a load relay, a load, a pre-charge relay and a pre-charge resistor; the first switch component is connected to both ends of a first relay branch, the first relay branch comprises a charge and discharge control component, the load relay and the load connected in sequence, the first switch component is connected to the controller, the controller is used to control the conduction or disconnection of the branch where the first switch component is located through the first switch component, the charge and discharge control component comprises the main positive relay, the pre-charge relay and the pre-charge resistor, the pre-charge relay and the pre-charge resistor are connected in series and then in parallel with the main positive relay; the second switch component is connected to the second relay branch The second relay branch includes the load relay, the load and the main negative relay connected in sequence, and the second switch component is connected to the controller; the controller is used to control the conduction or disconnection of the branch where the second switch component is located through the second switch component; the controller is respectively connected to the first relay branch and the second relay branch; the power supply is connected to the controller; the controller is used to obtain the first voltage across the second relay branch when receiving the vehicle power-on command, and supply power to the first switch component when the first voltage is equal to the first preset voltage threshold to facilitate the conduction of the branch where the first switch component is located, and obtain the second voltage across the main negative relay, and determine whether there is a sticky relay between the load relay and the main negative relay according to the second voltage.

[0006] Optionally, the load relay is a heating relay, and the load is a heating load. The controller is also used to supply power to the second switch component when the first voltage is not equal to a first preset voltage threshold to facilitate the conduction of the branch where the second switch component is located, and to obtain a third voltage across the main negative relay and a fourth voltage across the main positive relay, and determine whether any of the main positive relay, the pre-charging relay, the heating relay and the main negative relay has any relay that is stuck based on the third voltage and the fourth voltage.

[0007] Optionally, the controller is used to determine that the main negative relay is stuck when the second voltage is equal to a second preset voltage threshold; and, when the second voltage is not equal to the second preset voltage threshold, obtain a fifth voltage across the second relay branch, and determine that the heating relay is stuck when the fifth voltage is not equal to a third preset voltage threshold.

[0008] Optionally, the controller is used to determine that the heating relay is stuck when the third voltage is greater than a fourth preset voltage threshold; and to supply power to the first switch component to facilitate the conduction of the branch where the first switch component is located when the third voltage is less than or equal to the fourth preset voltage threshold, and obtain a sixth voltage across the main negative relay, and determine that the main negative relay is stuck when the sixth voltage is equal to the fifth preset voltage threshold.

[0009] Optionally, the controller is used to determine that the main positive relay is stuck when the fourth voltage is equal to a sixth preset voltage threshold; and to determine that the pre-charging relay is stuck when the fourth voltage is not equal to the sixth preset voltage threshold.

[0010] Optionally, the device also includes a voltage acquisition circuit, which is respectively connected to the first relay branch, the second relay branch and the controller; the voltage acquisition circuit is used to collect a first voltage across the second relay branch and a second voltage across the main negative relay.

[0011] Optionally, the device also includes a prompt device, which is connected to the controller; the controller is also used to control the prompt device to issue a prompt message when there is a relay that is stuck among the main positive relay, the pre-charge relay, the load relay and the main negative relay.

[0012] In a second aspect, the present disclosure provides a relay adhesion detection method, which is applied to a controller in a relay adhesion detection device, wherein the device comprises: a power supply circuit, a first switch component, a second switch component and a controller, wherein the power supply circuit comprises a power supply, a main positive relay, a main negative relay, a load relay, a load, a pre-charge relay and a pre-charge resistor; the first switch component is connected to both ends of a first relay branch, the first relay branch comprises a charge and discharge control component, the load relay and the load connected in sequence, the first switch component is connected to the controller, the controller is used to control the conduction or disconnection of the branch where the first switch component is located through the first switch component, the charge and discharge control component comprises the main positive relay, the pre-charge relay and the pre-charge resistor, the pre-charge relay and the pre-charge resistor are connected in series and then in parallel with the main positive relay; the second switch component is connected connected to both ends of a second relay branch, the second relay branch includes the load relay, the load and the main negative relay connected in sequence, and the second switch component is connected to the controller; the controller is used to control the conduction or disconnection of the branch where the second switch component is located through the second switch component; the controller is respectively connected to the first relay branch and the second relay branch; the power supply is connected to the controller; the method includes: upon receiving a vehicle power-on command, obtaining a first voltage across the second relay branch; when the first voltage is equal to a first preset voltage threshold, supplying power to the first switch component to facilitate the conduction of the branch where the first switch component is located, and obtaining a second voltage across the main negative relay; based on the second voltage, determining whether there is a sticky relay between the load relay and the main negative relay.

[0013] Optionally, the load relay is a heating relay, and the load is a heating load. The method also includes: when the first voltage is not equal to a first preset voltage threshold, supplying power to the second switch component to facilitate the conduction of the branch where the second switch component is located, and obtaining a third voltage across the main negative relay and a fourth voltage across the main positive relay; based on the third voltage and the fourth voltage, determining whether there is any relay that is stuck among the main positive relay, the pre-charging relay, the heating relay and the main negative relay.

[0014] Optionally, determining whether the heating relay and the main negative relay are stuck based on the second voltage includes: when the second voltage is equal to a second preset voltage threshold, determining that the main negative relay is stuck; and, when the second voltage is not equal to the second preset voltage threshold, obtaining a fifth voltage across the second relay branch, and when the fifth voltage is not equal to a third preset voltage threshold, determining that the heating relay is stuck.

[0015] Optionally, determining whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck based on the third voltage includes: when the third voltage is greater than a fourth preset voltage threshold, determining that the heating relay is stuck; and, when the third voltage is less than or equal to a fourth preset voltage threshold, supplying power to the first switch component to facilitate the conduction of the branch where the first switch component is located, and obtaining a sixth voltage across the main negative relay, and when the sixth voltage is equal to a fifth preset voltage threshold, determining that the main negative relay is stuck.

[0016] Optionally, determining whether the main positive relay, the pre-filling relay, the heating relay and the main negative relay are stuck based on the fourth voltage includes: when the fourth voltage is equal to a sixth preset voltage threshold, determining that the main positive relay is stuck; and, when the fourth voltage is not equal to the sixth preset voltage threshold, determining that the pre-filling relay is stuck.

[0017] Optionally, the device also includes a voltage acquisition circuit, which is respectively connected to the first relay branch, the second relay branch and the controller; the method includes: acquiring a first voltage across the second relay branch and a second voltage across the main negative relay.

[0018] Optionally, the method further includes: issuing a prompt message when a sticky relay exists among the main positive relay, the pre-charge relay, the load relay and the main negative relay.

[0019] In a third aspect, the present disclosure provides a vehicle, comprising the relay adhesion detection device described above.

[0020] Through the above technical scheme, the relay adhesion detection device in the present disclosure includes a power supply circuit, a first switch component, a second switch component and a controller, wherein the power supply circuit includes a power supply, a main positive relay, a main negative relay, a load relay, a load, a pre-charge relay and a pre-charge resistor; the first switch component is connected to the two ends of the first relay branch, the first relay branch includes a charge and discharge control component, the load relay and the load connected in sequence, the first switch component is connected to the controller, and the controller is used to control the conduction or disconnection of the branch where the first switch component is located through the first switch component, the charge and discharge control component includes the main positive relay, the pre-charge relay and the pre-charge resistor, the pre-charge relay and the pre-charge resistor are connected in series and then connected in parallel with the main positive relay; the second switch component is connected to the two ends of the second relay branch, and the second relay branch The invention comprises the load relay, the load and the main negative relay connected in sequence, the second switch component is connected to the controller; the controller is used to control the conduction or disconnection of the branch where the second switch component is located through the second switch component; the controller is respectively connected to the first relay branch and the second relay branch; the power supply is respectively connected to the first relay branch, the second relay branch and the controller; the controller is used to obtain the first voltage at both ends of the second relay branch when receiving the vehicle power-on instruction, and to supply power to the first switch component when the first voltage is equal to the first preset voltage threshold, so as to facilitate the conduction of the branch where the first switch component is located, and obtain the second voltage at both ends of the main negative relay, and determine whether there is a relay that is stuck in the load relay and the main negative relay according to the second voltage. In the present disclosure, by adding the first switch component and the second switch component, the controller controls the conduction or disconnection of the first switch component and the second switch component. The controller can control the power supply to the first switch component according to the first voltage at both ends of the second relay branch, so as to further determine whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck. In this way, all relays can be tested before the vehicle is powered on at high voltage. In the event that a relay is stuck, the stuck relay can be accurately identified, and the entire testing cycle can be shortened to ensure the driving safety of the vehicle.

[0021] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0023] Figure 1 is a structural schematic diagram of a relay adhesion detection device provided by an embodiment of the present disclosure;

[0024] Figure 2 is a circuit connection diagram of a relay provided in an embodiment of the present disclosure;

[0025] Figure 3 is a connection diagram of a first switch assembly provided by an embodiment of the present disclosure;

[0026] Figure 4 is a connection diagram of a second switch assembly provided by an embodiment of the present disclosure;

[0027] Figure 5 is a structural schematic diagram of another relay adhesion detection device provided by an embodiment of the present disclosure;

[0028] Figure 6 is a structural schematic diagram of another relay adhesion detection device provided by an embodiment of the present disclosure;

[0029] Figure 7 is a flow chart of a relay adhesion detection method provided by an embodiment of the present disclosure;

[0030] Figure 8 is a flow chart of another relay adhesion detection method provided by an embodiment of the present disclosure;

[0031] Fig. 9 is a flow chart of another relay adhesion detection method provided by an embodiment of the present disclosure;

[0032] Fig.10 is a flow chart of another relay adhesion detection method provided by an embodiment of the present disclosure;

[0033] Fig.11 It is a block diagram of a vehicle provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0035] In the description below, words such as “first” and “second” are only used for the purpose of distinguishing the description and should not be understood as indicating or implying relative importance or order.

[0036] First, the application scenario of the present disclosure is explained. The present disclosure is applied to the scenario where the relay is stuck. In this scenario, the vehicle cuts off the load under different working conditions, and the relay may stick when it is closed or disconnected. Once the adhesion occurs, it will seriously endanger the driving safety of the whole vehicle. At present, the detection of the main positive relay and the pre-filling relay can only determine whether one of the main positive relay and the pre-filling relay is stuck based on the voltage at both ends of the main positive relay. The adhesion of the main negative relay and the heating relay requires closing and disconnecting each relay multiple times after power-on to be detected. However, the inventors have found that the current detection of relay adhesion cannot accurately determine which relay is stuck, and the entire detection cycle is long and the detection process is relatively complicated.

[0037] In order to solve the above problems, the present disclosure provides a relay adhesion detection device, method and vehicle, by adding a first switch component and a second switch component, the controller controls the conduction or disconnection of the first switch component and the second switch component. The controller can determine whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are adhered according to the first voltage at both ends of the second relay branch. In this way, all relays can be detected before the vehicle is powered on at high voltage. In the case of relay adhesion, the relay that is adhered can be accurately determined, and the entire detection cycle is shortened to ensure the driving safety of the vehicle.

[0038] The present disclosure is described below in conjunction with specific embodiments.

[0039] Figure 1 A relay adhesion detection device 100 is provided in an embodiment of the present disclosure, such as Figure 1As shown, the device 100 includes: a power supply circuit, a first switch component 101, a second switch component 102 and a controller 103, the power supply circuit includes a power supply 104, a main positive relay, a main negative relay, a load relay, a load, a pre-charge relay and a pre-charge resistor; the first switch component 101 is connected to both ends of a first relay branch 105, the first relay branch 105 includes a charge and discharge control component, the load relay and the load connected in sequence, the first switch component 101 is connected to the controller 103, the controller 103 is used to control the conduction or disconnection of the branch where the first switch component 101 is located through the first switch component 101, and the charge and discharge control component includes The first relay 101 and the second relay 102 are connected in series and then in parallel with the first relay 101; the second switch component 102 is connected to both ends of the second relay branch 106; the second relay branch 106 includes the load relay, the load and the main negative relay connected in sequence; the second switch component 102 is connected to the controller 103; the controller 103 is used to control the conduction or disconnection of the branch where the second switch component 102 is located through the second switch component 102; the controller 103 is respectively connected to the first relay branch 101 and the second relay branch 102; the power supply 104 is connected to the controller 103;

[0040] The controller 103 is used to obtain a first voltage across the second relay branch 106 upon receiving a vehicle power-on command, and to supply power to the first switch component 101 when the first voltage is equal to a first preset voltage threshold to facilitate conduction of the branch where the first switch component 101 is located, and to obtain a second voltage across the main negative relay, and to determine whether any of the load relays and the main negative relay has a sticky relay based on the second voltage.

[0041] The controller 103 may be a BMS (Battery Management System) system. Also, the load relay may be a heating relay or other relays. Similarly, the load may correspond to a heating load or other loads, which is not specifically limited in the present disclosure.

[0042] In addition, the first preset voltage threshold can be set according to the configuration of different relays. The first preset voltage threshold can be a specific value or a range of values, which is not limited in the present disclosure.

[0043] It should be noted that if the voltage value at both ends of the first relay branch is detected, it is impossible to accurately determine whether the main negative relay is stuck, and then it is impossible to further determine whether the remaining relays are stuck by controlling the conduction or disconnection of the first switch component or the second switch component. Therefore, in this solution, by obtaining the voltage value at both ends of the second relay branch, it is possible to preliminarily determine whether there are sticky relays in the heating relay and the main negative relay, and then further determine whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck by controlling the conduction or disconnection of the first switch component or the second switch component.

[0044] By adopting the above device, by adding the first switch component and the second switch component, the controller controls the conduction or disconnection of the first switch component and the second switch component. The controller can control the power supply to the first switch component according to the first voltage at both ends of the second relay branch, so as to further determine whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck. In this way, all relays can be tested before the vehicle is powered on at high voltage. In the case of sticking of relays, the sticking relays can be accurately determined, and the entire detection cycle is shortened to ensure the driving safety of the vehicle.

[0045] For ease of explanation, Figure 2 A circuit connection diagram of a relay provided in this embodiment, such as Figure 2 As shown, K1 is the main positive relay, K2 is the pre-charging relay, K3 is the heating relay, and K4 is the main negative relay. Among them, the pre-charging relay is connected in series with the pre-charging resistor and then connected in parallel with the main positive relay. One end of the main positive relay is connected to the power supply, and the other end is connected to the heating relay. The other end of the heating relay is connected to the heating load, and the other end of the heating load is connected to the main negative relay. The other end of the main negative relay is connected to the negative pole of the power supply. The heating relay and the heating load are connected to form a heating branch, which can heat the battery pack to ensure the performance of the battery. The pre-charging relay and the pre-charging resistor are connected to form a pre-charging branch, which can pre-charge the capacitive load and prevent the capacitive load from being damaged by the impact of high voltage.

[0046] The controller determines whether to supply power to the first switch assembly or the second switch assembly according to the voltage across the first relay branch, and further determines whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck. If any of the main positive relay, the pre-charge relay, the heating relay and the main negative relay is stuck, the controller controls the prompt device to issue a prompt message.

[0047] The high-voltage load is connected in parallel at both ends of the branch formed by the heating relay and the heating load in series, wherein the high-voltage load may include PTC (Positive Temperature Coefficient in English; electric heater in Chinese), OBC (On board charger in English; on-board charger in Chinese), MCU (Moter Control Unit in English; motor controller in Chinese), DCDC (Direct Current in English; DC buck in Chinese), compressor, fast charging port and other loads. The specific functions of the loads included in the high-voltage load can refer to the relevant descriptions in the prior art, which will not be repeated here.

[0048] The following description is made by taking the load relay as a heating relay and the load as a heating load as an example.

[0049] The controller 103 is used to determine that the main negative relay is stuck when the second voltage is equal to the second preset voltage threshold; and to obtain the fifth voltage across the second relay branch when the second voltage is not equal to the second preset voltage threshold, and determine that the heating relay is stuck when the fifth voltage is not equal to the third preset voltage threshold.

[0050] Among them, the second preset voltage threshold and the third preset voltage threshold can be set according to the configuration of different relays. The second preset voltage threshold and the third preset voltage threshold can be a specific value or a value range, which is not limited in the present disclosure.

[0051] In addition, when the controller 103 receives a power-on command sent by the vehicle, it determines whether the main positive relay, the pre-charge relay, the load relay and the main negative relay are stuck based on the first voltage. When the first voltage determines that none of the main positive relay, the pre-charge relay, the load relay and the main negative relay are stuck, the controller 103 performs high voltage power-on according to the power-on command.

[0052] It should be noted that when the fifth voltage is equal to the third preset voltage threshold, it is determined that no sticky relays occur among the main positive relay, the pre-charging relay, the heating relay and the main negative relay, that is, the vehicle can be powered on normally at high voltage.

[0053] like Figure 3As shown, in this embodiment, the first switch component 101 may include a first optical coupler and a first resistor, the first switch component 101 is connected to both ends of the first relay branch 105, and the first switch component 101 is connected to the controller 103. When the controller 103 supplies power to the first switch component 101, the diode in the first optical coupler lights up, so that the transistor is turned on, and the branch where the first switch component 101 is located is turned on. Figure 3 Medium V aux1 It is the auxiliary voltage inside the controller, which is a low voltage, generally 5V to 12V. The first optocoupler is an isolation device, which can isolate the low voltage at the controller end from the high voltage at the relay end while serving as a switch component, thereby ensuring the safety of the entire circuit.

[0054] The controller 103 is used to supply power to the second switch component 102 when the first voltage is not equal to the first preset voltage threshold, so as to facilitate the conduction of the branch where the second switch component 102 is located, and to obtain the third voltage across the main negative relay and the fourth voltage across the main positive relay, and determine whether the main positive relay, the pre-charging relay, the heating relay and the main negative relay are stuck according to the third voltage and the fourth voltage.

[0055] The controller 103 is used to determine that the heating relay is stuck when the third voltage is greater than a fourth preset voltage threshold; and to supply power to the first switch component 101 to facilitate the conduction of the branch where the first switch component 101 is located when the third voltage is less than or equal to the fourth preset voltage threshold, and to obtain a sixth voltage across the main negative relay, and to determine that the main negative relay is stuck when the sixth voltage is equal to the fifth preset voltage threshold.

[0056] It should be noted that when the sixth voltage is not equal to the fifth preset voltage threshold, it is determined that no sticky relays occur among the main positive relay, the pre-charging relay, the heating relay and the main negative relay, that is, the vehicle can be powered on normally at high voltage.

[0057] The controller 103 is used to determine that the main positive relay is stuck when the fourth voltage is equal to the sixth preset voltage threshold; and

[0058] When the fourth voltage is not equal to the sixth preset voltage threshold, it is determined that the pre-charging relay is stuck.

[0059] Among them, the fourth preset voltage threshold, the fifth preset voltage threshold and the sixth preset voltage threshold can be set according to the configuration of different relays. The fourth preset voltage threshold, the fifth preset voltage threshold and the sixth preset voltage threshold can be a specific value or a range of values, which is not limited in the present disclosure.

[0060] like Figure 4 As shown, in this embodiment, the second switch component 102 may include a second optical coupler and a second resistor, the second switch component 102 is connected to both ends of the second relay branch 103, and the second switch component 102 is connected to the controller 103. When the controller 103 supplies power to the second switch component 102, the diode in the first optical coupler lights up, so that the transistor is turned on, and the branch where the second switch component 102 is located is turned on. Figure 4 Medium V aux2 It is the auxiliary voltage inside the controller, which is a low voltage, generally 5V to 12V. The second optocoupler is an isolation device, which can isolate the low voltage at the controller end from the high voltage at the relay end while acting as a switch component, thereby ensuring the safety of the entire circuit.

[0061] In addition, the first optocoupler and the second optocoupler in this solution can also be replaced by an isolation transformer, which can also achieve the final beneficial effect. It can also be other devices that can isolate high voltage and low voltage. The present disclosure does not make specific limitations on this.

[0062] like Figure 5 As shown, the device 100 further includes a voltage acquisition circuit 107, and the voltage acquisition circuit 107 is respectively connected to the first relay branch 105, the second relay branch 106 and the controller 103;

[0063] The voltage collection circuit 107 is used to collect the first voltage across the second relay branch 106 .

[0064] Similarly, the voltage acquisition circuit 107 can also be used to acquire the second voltage, the third voltage and the sixth voltage across the main negative relay, the fifth voltage across the second relay branch 106 and the fourth voltage across the main positive relay.

[0065] For example, the voltage collection circuit 107 may collect voltage through voltage collection points, such as Figure 2 As shown, a voltage collection point A is provided between the main positive relay and the positive pole of the power supply, a voltage collection point B is provided between the main positive relay and the heating relay, a voltage collection point C is provided between the heating load and the main negative relay, and a voltage collection point D is provided between the main negative relay and the negative pole of the power supply. In this solution, the voltage collection circuit 106 can determine whether the main positive relay, the pre-charging relay, the heating relay, and the main negative relay are stuck by collecting the first voltage and the fifth voltage between BD, the second voltage, the third voltage, and the sixth voltage between CD, and the fourth voltage between AB.

[0066] like Figure 6As shown, the device 100 further includes a prompting device 108, and the prompting device 108 is connected to the controller 103;

[0067] The controller 103 is also used to control the prompt device 108 to issue a prompt message when there is a relay that is stuck among the main positive relay, the pre-charge relay, the load relay and the main negative relay.

[0068] For example, if the main negative relay is stuck, the prompt message may be "The main negative relay is stuck, please pay attention to check it in time", so that the user can promptly understand the stuck relay and deal with it in time to avoid further dangerous accidents.

[0069] By adopting the above device, by adding the first switch component and the second switch component, the controller controls the conduction or disconnection of the first switch component and the second switch component. The controller can determine the conduction of the first switch component and the second switch component according to the first voltage at both ends of the second relay branch, and then determine whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck. In this way, all relays can be tested before the vehicle is powered on at high voltage. In the case of sticking of relays, the sticking relays can be accurately determined, and the entire detection cycle is shortened to ensure the driving safety of the vehicle.

[0070] Figure 7 It is a flow chart of a relay adhesion detection method provided by an embodiment of the present disclosure, which is applied to a controller in a relay adhesion detection device, the device comprising: a power supply circuit, a first switch component, a second switch component and a controller, the power supply circuit comprising a power supply, a main positive relay, a main negative relay, a load relay, a load, a pre-charge relay and a pre-charge resistor; the first switch component is connected to both ends of a first relay branch, the first relay branch comprises a charge and discharge control component, the load relay and the load connected in sequence, the first switch component is connected to the controller, and the controller is used to control the first switch component through the first switch component The charge and discharge control component is used to control the conduction or disconnection of the branch where the second switch component is located. The charge and discharge control component includes the main positive relay, the pre-charge relay and the pre-charge resistor. The pre-charge relay and the pre-charge resistor are connected in series and then connected in parallel with the main positive relay; the second switch component is connected to both ends of the second relay branch. The second relay branch includes the load relay, the load and the main negative relay connected in sequence. The second switch component is connected to the controller; the controller is used to control the conduction or disconnection of the branch where the second switch component is located through the second switch component; the controller is respectively connected to the first relay branch and the second relay branch; the power supply is connected to the controller;

[0071] like Figure 7 As shown, the method comprises the following steps:

[0072] S701. When a vehicle power-on command is received, obtain a first voltage across the second relay branch.

[0073] S702: When the first voltage is equal to a first preset voltage threshold, supply power to the first switch component and obtain a second voltage across the main negative relay.

[0074] Wherein, power is supplied to the first switch component to facilitate conduction of the branch where the first switch component is located.

[0075] S703: Determine whether there is a sticky relay between the load relay and the main load relay according to the second voltage.

[0076] The second voltage across the main negative relay is collected by a voltage collection circuit.

[0077] When the second voltage is equal to the second preset voltage threshold, it is determined that the main negative relay is stuck; and,

[0078] Further, when the second voltage is not equal to the second preset voltage threshold, a fifth voltage across the second relay branch is obtained, and when the fifth voltage is not equal to the third preset voltage threshold, it is determined that the heating relay is stuck.

[0079] The fifth voltage across the second relay branch is collected by a voltage collection circuit.

[0080] By adopting the above method, by adding a first switch component and a second switch component, the controller controls the conduction or disconnection of the first switch component and the second switch component. The controller can control the power supply to the first switch component according to the first voltage at both ends of the second relay branch, so as to further determine whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck. In this way, all relays can be tested before the vehicle is powered on at high voltage. In the case of sticking of relays, the stuck relays can be accurately determined, and the entire detection cycle is shortened to ensure the driving safety of the vehicle.

[0081] Figure 8 is a flow chart of another relay adhesion detection method provided by an embodiment of the present disclosure, and is described by taking the load relay as a heating relay and the load as a heating load as an example. Figure 8 As shown, the method also includes:

[0082] S704: When the first voltage is not equal to the first preset voltage threshold, supply power to the second switch component, and obtain a third voltage across the main negative relay and a fourth voltage across the main positive relay.

[0083] Wherein, power is supplied to the second switch component to facilitate conduction of the branch where the second switch component is located.

[0084] S705. Determine whether any of the main positive relay, the pre-charging relay, the heating relay, and the main negative relay is stuck based on the third voltage and the fourth voltage.

[0085] The third voltage across the main negative relay and the fourth voltage across the main positive relay are collected by a voltage collection circuit.

[0086] Further, when the third voltage is greater than the fourth preset voltage threshold, it is determined that the heating relay is stuck; and when the third voltage is less than or equal to the fourth preset voltage threshold, power is supplied to the first switch component to facilitate the conduction of the branch where the first switch component is located, and the sixth voltage across the main negative relay is obtained, and when the sixth voltage is equal to the fifth preset voltage threshold, it is determined that the main negative relay is stuck.

[0087] Among them, the sixth voltage across the main negative relay is collected by a voltage collection circuit.

[0088] When the fourth voltage is equal to the sixth preset voltage threshold, it is determined that the main positive relay is stuck; and when the fourth voltage is not equal to the sixth preset voltage threshold, it is determined that the pre-charge relay is stuck.

[0089] like Fig. 9 As shown, the method also includes:

[0090] S706: When any of the main positive relay, the pre-charge relay, the load relay, and the main negative relay is stuck, a prompt message is issued.

[0091] The above method is adopted, by adding the first switch component and the second switch component, the controller controls the conduction or disconnection of the first switch component and the second switch component. The controller can determine the conduction of the first switch component and the second switch component according to the first voltage at both ends of the second relay branch, and then determine whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck. In this way, all relays can be detected before the vehicle is powered on at high voltage. In the case of sticking of relays, the sticking relays can be accurately determined, and the entire detection cycle is shortened to ensure the driving safety of the vehicle.

[0092] For example, the load relay is a heating relay, and the load is a heating load. Fig.10is a flow chart of another relay adhesion detection method provided by an embodiment of the present disclosure, such as Fig.10 As shown, the method comprises the following steps:

[0093] S1001. When a vehicle power-on command is received, obtain a first voltage across the second relay branch.

[0094] S1002: Determine whether the first voltage is equal to a first preset voltage threshold.

[0095] When the first voltage is equal to the first preset voltage threshold, executing step S903;

[0096] When the first voltage is not equal to the first preset voltage threshold, step S904 is executed.

[0097] S1003. Supply power to the first switch component.

[0098] Wherein, power is supplied to the first switch component to facilitate conduction of the branch where the first switch component is located.

[0099] S1004. Supply power to the second switch component.

[0100] Wherein, power is supplied to the second switch component to facilitate conduction of the branch where the second switch component is located.

[0101] S1005. Obtain a second voltage across the main negative relay.

[0102] S1006: Determine whether the second voltage is equal to a second preset voltage threshold.

[0103] When the second voltage is equal to the second preset voltage threshold, executing step S1007;

[0104] When the second voltage is not equal to the second preset voltage threshold, step S1008 is executed.

[0105] S1007. Determine whether the main negative relay is stuck.

[0106] S1008. Obtain a fifth voltage across the second relay branch.

[0107] S1009: Determine whether the fifth voltage is equal to a third preset voltage threshold.

[0108] When the fifth voltage is equal to the third preset voltage threshold, executing step S1010;

[0109] When the fifth voltage is not equal to the third preset voltage threshold, step S1011 is executed.

[0110] Wherein, when the fifth voltage is equal to the third preset voltage threshold, it is determined that no sticking relay occurs among the main positive relay, the pre-charging relay, the heating relay and the main negative relay.

[0111] S1010, power on normally.

[0112] In the case where no relay among the main positive relay, the pre-charging relay, the heating relay and the main negative relay is stuck, the vehicle can be powered on normally.

[0113] S1011. Determine that the heating relay is stuck.

[0114] S1012: Obtain a third voltage across the main negative relay and a fourth voltage across the main positive relay.

[0115] S1013: Determine whether the third voltage is greater than a fourth preset voltage threshold.

[0116] When the third voltage is greater than the fourth preset voltage threshold, executing step S1011;

[0117] When the third voltage is less than or equal to the fourth preset voltage threshold, step S1014 is executed.

[0118] S1014. Supply power to the first switch component.

[0119] Wherein, power is supplied to the first switch component to facilitate conduction of the branch where the first switch component is located.

[0120] S1015. Obtain a sixth voltage across the main negative relay.

[0121] S1016: Determine whether the sixth voltage is equal to a fifth preset voltage threshold.

[0122] When the sixth voltage is equal to the fifth preset voltage threshold, executing step S1007;

[0123] When the sixth voltage is not equal to the fifth preset voltage threshold, step S1010 is executed.

[0124] Among them, when the sixth voltage is equal to the fifth preset voltage threshold, it is determined that no sticking relay occurs among the main positive relay, the pre-charging relay, the heating relay and the main negative relay.

[0125] S1017: Determine whether the fourth voltage is equal to a sixth preset voltage threshold.

[0126] When the fourth voltage is equal to the sixth preset voltage threshold, executing step S1018;

[0127] When the fourth voltage is not equal to the sixth preset voltage threshold, step S1019 is executed.

[0128] S1018. Determine that the main positive relay is stuck.

[0129] S1019. Determine that the pre-charging relay is stuck.

[0130] S1020. Issue a prompt message.

[0131] The above method is adopted, by adding the first switch component and the second switch component, the controller controls the conduction or disconnection of the first switch component and the second switch component. The controller can determine the conduction of the first switch component and the second switch component according to the first voltage at both ends of the second relay branch, and then determine whether the main positive relay, the pre-charge relay, the heating relay and the main negative relay are stuck. In this way, all relays can be detected before the vehicle is powered on at high voltage. In the case of sticking of relays, the sticking relays can be accurately determined, and the entire detection cycle is shortened to ensure the driving safety of the vehicle.

[0132] Regarding the method in the above embodiment, the specific manner of performing the operation in each step has been described in detail in the embodiment of the device, and will not be elaborated here.

[0133] like Fig.11 As shown, the present disclosure further provides a vehicle 1100 , comprising the above-mentioned relay adhesion detection device 100 .

[0134] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0135] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0136] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A relay adhesion detection device, characterized in that: The device comprises: a power supply circuit, a first switch component, a second switch component and a controller, wherein the power supply circuit comprises a power supply, a main positive relay, a main negative relay, a load relay, a load, a pre-charge relay and a pre-charge resistor; The first switch component is connected to both ends of the first relay branch, the first relay branch includes the charge and discharge control component, the load relay and the load connected in sequence, the first switch component is connected to the controller, the controller is used to control the conduction or disconnection of the branch where the first switch component is located through the first switch component, the charge and discharge control component includes the main positive relay, the pre-charge relay and the pre-charge resistor, the pre-charge relay and the pre-charge resistor are connected in series and then connected in parallel with the main positive relay; the second switch component is connected to both ends of the second relay branch, the second relay branch includes the load relay, the load and the main negative relay connected in sequence, the second switch component is connected to the controller; the controller is used to control the conduction or disconnection of the branch where the second switch component is located through the second switch component; the controller is respectively connected to the first relay branch and the second relay branch; the power supply is connected to the controller; The controller is used to obtain a first voltage across the second relay branch when receiving a vehicle power-on command, supply power to the first switch component when the first voltage is equal to a first preset voltage threshold, so as to facilitate the conduction of the branch where the first switch component is located, and obtain a second voltage across the main negative relay, and determine whether there is a sticky relay between the load relay and the main negative relay according to the second voltage; The load relay is a heating relay, the load is a heating load, and the controller is used to determine that the main negative relay is stuck when the second voltage is equal to a second preset voltage threshold; and When the second voltage is not equal to the second preset voltage threshold, a fifth voltage across the second relay branch is acquired, and when the fifth voltage is not equal to the third preset voltage threshold, it is determined that the heating relay is stuck.

2. The device according to claim 1, characterized in that The controller is also used to supply power to the second switch component when the first voltage is not equal to a first preset voltage threshold so as to facilitate the conduction of the branch where the second switch component is located, and to obtain a third voltage across the main negative relay and a fourth voltage across the main positive relay, and to determine whether any of the main positive relay, the pre-charging relay, the heating relay and the main negative relay has any sticky relay based on the third voltage and the fourth voltage.

3. The device according to claim 2, characterized in that The controller is used to determine that the heating relay is stuck when the third voltage is greater than a fourth preset voltage threshold; as well as, When the third voltage is less than or equal to the fourth preset voltage threshold, power is supplied to the first switch component to facilitate the conduction of the branch where the first switch component is located, and the sixth voltage across the main negative relay is obtained. When the sixth voltage is equal to the fifth preset voltage threshold, it is determined that the main negative relay is stuck.

4. The device according to claim 2, characterized in that The controller is used to determine that the main positive relay is stuck when the fourth voltage is equal to a sixth preset voltage threshold; as well as, When the fourth voltage is not equal to the sixth preset voltage threshold, it is determined that the pre-charging relay is stuck.

5. The device according to claim 1, characterized in that The device further comprises a voltage acquisition circuit, wherein the voltage acquisition circuit is respectively connected to the first relay branch, the second relay branch and the controller; The voltage acquisition circuit is used to acquire a first voltage across the second relay branch and a second voltage across the main negative relay.

6. The device according to any one of claims 1 to 5, characterized in that The device further comprises a prompting device, wherein the prompting device is connected to the controller; The controller is further used to control the prompt device to issue a prompt message when there is a relay that is stuck among the main positive relay, the pre-charge relay, the load relay and the main negative relay.

7. A relay adhesion detection method, characterized in that: A controller applied to a relay adhesion detection device, the device comprising: a power supply circuit, a first switch component, a second switch component and a controller, the power supply circuit comprising a power supply, a main positive relay, a main negative relay, a load relay, a load, a pre-charge relay and a pre-charge resistor; the first switch component is connected to both ends of a first relay branch, the first relay branch comprises a charge and discharge control component, the load relay and the load connected in sequence, the first switch component is connected to the controller, the controller is used to control the conduction or disconnection of the branch where the first switch component is located through the first switch component, the charge and discharge control component comprises the main positive relay, the pre-charge relay and the pre-charge resistor, the pre-charge relay and the pre-charge resistor are connected in series and then connected in parallel with the main positive relay; the second switch component is connected to both ends of a second relay branch, the second relay branch comprises the load relay, the load and the main negative relay connected in sequence, the second switch component is connected to the controller; the controller is used to control the conduction or disconnection of the branch where the second switch component is located through the second switch component; the controller is connected to the first relay branch and the second relay branch respectively; the power supply is connected to the controller; the method comprises: Upon receiving a vehicle power-on command, obtaining a first voltage across the second relay branch; When the first voltage is equal to a first preset voltage threshold, power is supplied to the first switch component to facilitate conduction of the branch where the first switch component is located, and a second voltage across the main negative relay is obtained; determining, based on the second voltage, whether any of the load relays and the main negative relay is stuck; The load relay is a heating relay, the load is a heating load, and determining whether there is a sticky relay between the load relay and the main negative relay based on the second voltage includes: when the second voltage is equal to a second preset voltage threshold, determining that the main negative relay is stuck; and, when the second voltage is not equal to the second preset voltage threshold, obtaining a fifth voltage across the second relay branch, and when the fifth voltage is not equal to a third preset voltage threshold, determining that the heating relay is stuck.

8. The method according to claim 7, characterized in that The method further comprises: When the first voltage is not equal to the first preset voltage threshold, power is supplied to the second switch component to facilitate the conduction of the branch where the second switch component is located, and a third voltage across the main negative relay and a fourth voltage across the main positive relay are obtained; According to the third voltage and the fourth voltage, it is determined whether any of the main positive relay, the pre-charging relay, the heating relay, and the main negative relay has a stuck relay.

9. A vehicle, characterized in that: The device comprises the device described in any one of claims 1 to 6 above.

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