High voltage system heating protection method, device and related equipment

Abstract

The present invention provides a method, device and related equipment for protecting a high-voltage system from overheating, the method comprising: obtaining an actual voltage difference between two ends of a target wiring harness, the target wiring harness being used to connect a battery management system and a target electrical appliance; when the actual voltage difference is greater than a reference voltage difference threshold, controlling the target electrical appliance to operate at a target operating power, the target operating power being less than the current operating power of the target electrical appliance. The method for protecting a high-voltage system from overheating provided by an embodiment of the present application can timely detect poor contact of the target wiring harness by obtaining the actual voltage difference between two ends of the target wiring harness, combined with a reference voltage difference threshold, and when the target wiring harness has poor contact, by reducing the operating power of the target electrical appliance, while avoiding overheating of the target wiring harness, maintain the continuous operation of the vehicle, thereby improving the safety of the vehicle and the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a method and device for protecting a high-voltage system from overheating, and related equipment. Background Art

[0002] In the field of new energy vehicle technology, the vehicle's high-voltage accessories are likely to malfunction during operation, increasing the probability of vehicle fire and seriously endangering the lives of drivers and passengers. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides a high voltage system heating protection method.

[0005] A second aspect of the present invention provides a high voltage system heating protection device.

[0006] A third aspect of the present invention provides a storage medium.

[0007] A fourth aspect of the present invention provides an electronic device.

[0008] In view of this, according to a first aspect of an embodiment of the present application, a high voltage system heating protection method is proposed, comprising:

[0009] Obtaining an actual voltage difference between two ends of a target wiring harness, where the target wiring harness is used to connect a battery management system and a target electrical appliance;

[0010] When the actual voltage difference is greater than the reference voltage difference threshold, the target electrical appliance is controlled to operate at a target operating power, and the target operating power is less than the current operating power of the target electrical appliance.

[0011] In a feasible implementation manner, when the actual voltage difference is greater than the reference voltage difference threshold, the step of controlling the target electrical appliance to operate at the target operating power includes:

[0012] Obtain the minimum operating voltage of the target electrical appliance;

[0013] Determine the target operating power based on the minimum operating voltage;

[0014] Control the target electrical appliances to operate at the target operating power.

[0015] In a feasible implementation manner, the high voltage system heating protection method further includes:

[0016] When the actual voltage difference is greater than the reference voltage difference threshold, the adjusted current value of the target wiring harness is determined according to the minimum operating voltage and the target operating power;

[0017] Determine the actual resistance value of the target wiring harness according to the difference between the adjusted current value and the actual voltage;

[0018] Obtain the original resistance value of the target wiring harness;

[0019] The difference between the actual resistance value and the original resistance value is determined as the virtual connection resistance value of the target wiring harness.

[0020] In a feasible implementation manner, the high voltage system heating protection method further includes:

[0021] When the actual voltage difference is greater than the reference voltage difference threshold, obtaining the actual temperature value and the tolerance temperature value of the target wiring harness;

[0022] Determine the allowable temperature rise value of the target wiring harness according to the actual temperature value and the tolerance temperature value;

[0023] The estimated temperature rise time of the target wiring harness is determined according to the allowable temperature rise value and the virtual connection resistance value. The estimated temperature rise time is the time required for the temperature of the target wiring harness to rise from the actual temperature value to the tolerance temperature value.

[0024] In a feasible implementation manner, when the actual voltage difference is greater than the reference voltage difference threshold, the step of controlling the target electrical appliance to operate at the target operating power further includes:

[0025] Control the target electrical appliance to run at the target operating power and estimate the heating time;

[0026] When the expected heating time is reached, the vehicle high voltage is controlled to be powered off.

[0027] In a feasible implementation manner, the step of obtaining the actual voltage difference between the two ends of the target wiring harness includes:

[0028] Acquire a first actual voltage value of a battery management system;

[0029] Acquire a second actual voltage value of the target electrical appliance;

[0030] An actual voltage difference is determined according to the first actual voltage value and the second actual voltage value.

[0031] In a feasible implementation manner, the high voltage system heating protection method further includes:

[0032] When the actual voltage difference is less than or equal to the reference voltage difference threshold, the target electrical appliance is controlled to operate at the current operating power.

[0033] According to a second aspect of an embodiment of the present application, a high voltage system heating protection device is provided, comprising:

[0034] A first acquisition module is used to acquire an actual voltage difference between two ends of a target wiring harness, where the target wiring harness is used to connect a battery management system and a target electrical appliance;

[0035] The first control module is used to control the target electrical appliance to operate at a target operating power when the actual voltage difference is greater than a reference voltage difference threshold, and the target operating power is less than the current operating power of the target electrical appliance.

[0036] According to a third aspect of an embodiment of the present application, a storage medium is proposed, the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the high-voltage system heating protection method proposed in any one of the first aspects above.

[0037] According to the fourth aspect of an embodiment of the present application, an electronic device is proposed, which includes at least one processor and at least one memory connected to the processor, wherein the processor is used to call program instructions in the memory to execute a high-voltage system heating protection method as proposed in any one of the first aspects above.

[0038] Compared with the prior art, the present invention includes at least the following beneficial effects: the high-voltage system heating protection method provided in the embodiment of the present application obtains the actual voltage difference between the two ends of the target wiring harness, and uses the actual voltage difference as the basis for judging whether the target wiring harness has poor contact. When the actual voltage difference between the two ends of the target wiring harness is greater than the reference voltage difference threshold, it can be determined that there is poor contact between the target wiring harness and the battery management system or the target electrical appliance, thereby controlling the target electrical appliance to operate at a target operating power less than the current operating power to reduce the current passing through the target wiring harness. On the one hand, the heating power of the target wiring harness can be reduced to avoid rapid heating of the target wiring harness in the case of poor contact, so as to prevent the temperature of the target wiring harness from exceeding the maximum tolerance temperature of the target wiring harness material during operation, reduce the risk of vehicle fire due to local overheating of the target wiring harness, improve the safety of the vehicle, and protect the lives of drivers and passengers; on the other hand, when a fault is found in the target wiring harness, it can avoid directly powering off the vehicle with high voltage, so that the vehicle can remain running, providing time for reminding the driver and passengers to deal with the fault and stop to avoid danger, thereby improving the user experience of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the exemplary embodiments below. The accompanying drawings are only for the purpose of illustrating exemplary embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0040] Figure 1A schematic application scenario diagram of a high voltage system heating protection method according to an embodiment of the present application;

[0041] Figure 2 A schematic flow chart of a high voltage system heating protection method according to an embodiment of the present application;

[0042] Figure 3 A schematic structural block diagram of a high voltage system heating protection device according to an embodiment of the present application;

[0043] Figure 4 A schematic structural block diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0045] like Figure 2 As shown, according to a first aspect of an embodiment of the present application, a high voltage system heating protection method is proposed, comprising:

[0046] Step S101: obtaining an actual voltage difference between two ends of a target wiring harness, where the target wiring harness is used to connect a battery management system and a target electrical appliance;

[0047] Specifically, the target wiring harness can be a wiring harness for connecting a battery management system (BMS) and a target electrical appliance, that is, one end of the target wiring harness is used to connect the battery management system, and the other end is used to connect the target electrical appliance, so that a connection between the battery management system and the target electrical appliance is established through the target wiring harness. The actual voltage difference at both ends of the target wiring harness, that is, the difference between the actual voltage value at one end of the target wiring harness and the actual voltage value at the other end, can be obtained by respectively obtaining the actual voltage values ​​at both ends of the target wiring harness, and further obtaining the aforementioned actual voltage difference, and then based on the actual voltage difference at both ends of the target wiring harness, it is judged whether the target wiring harness has poor contact, so as to provide a reliable reference for the heating protection of the vehicle's high-voltage system.

[0048] It should be noted that if there is a poor contact between the target wiring harness and the battery management system or between the target electrical appliance, the resistance at the location of the poor contact will increase, thereby causing the overall resistance of the high-voltage wiring harness to increase. When the current passing through the target wiring harness remains unchanged, the actual voltage difference at both ends of the target wiring harness will further increase, and hot spots will form in the area where the target wiring harness has poor contact, affecting the safe operation of the vehicle. Therefore, based on the intrinsic connection between the actual voltage difference at both ends of the target wiring harness and the poor contact of the target wiring harness, the present application can accurately judge whether the target wiring harness has a poor contact phenomenon based on the aforementioned actual voltage difference, and can promptly discover the fault problems of the high-voltage wiring harness during the operation of the vehicle, thereby improving the safety of vehicle operation.

[0049] like Figure 1 As shown, the high-voltage system of new energy vehicles usually includes batteries, MCU (Motor Control Unit; motor control unit) / GCU (Generator Control Unit; engine control unit), DCDC (Direct current-Direct current Converter; DC-DC converter), drive motor and generator, among which, the main function of MCU is to convert the high-voltage direct current output of the battery into alternating current to make the drive motor work; the battery has a built-in BMS, and the main function of BMS is to be the core electronic control unit for battery management and display status; DCDC is a device that converts electrical energy of one voltage value into electrical energy of another voltage value in a DC circuit. The main function of the on-board DCDC converter is to connect the power battery pack and charge the battery with the high-voltage power supply through the step-down DCDC converter, and it can also supply power to other low-voltage electrical appliances.

[0050] The aforementioned target harness may include Figure 1 The two high-voltage wire harnesses HV+ and HV- used to connect the battery and the MCU, that is, the high-voltage wire harness connecting the BMS and the MCU; and / or the two high-voltage wire harnesses including the battery and the DCDC, that is, the high-voltage wire harness connecting the BMS and the DCDC; accordingly, the target electrical appliance can be the MCU and / or the DCDC.

[0051] It is understandable that voltage monitoring devices can be set at both ends of the target wiring harness to obtain the actual voltage values ​​at both ends of the target wiring harness, or the actual voltage values ​​at both ends of the target wiring harness can be determined separately based on the actual voltage information of the target electrical appliance and the actual voltage information of the battery management system.

[0052] Step S102: when the actual voltage difference is greater than the reference voltage difference threshold, the target electrical appliance is controlled to operate at a target operating power, where the target operating power is less than the current operating power of the target electrical appliance.

[0053] Specifically, a reference voltage difference threshold can be set in advance, and the actual voltage difference at both ends of the target wiring harness is compared with the reference voltage difference threshold. When the target electrical appliance is running at the current operating power, the current passing through the target wiring harness is consistent with the current passing through the target electrical appliance. If the target wiring harness has poor contact, the resistance of the target wiring harness will increase, thereby causing the actual voltage difference to increase. When the actual voltage difference is greater than the reference voltage difference threshold, the target electrical appliance can be controlled to operate at a target operating power lower than the current operating power, thereby reducing the current passing through the target wiring harness, so as to reduce the heating power of the target wiring harness and avoid rapid heating in areas where the target wiring harness has poor contact, thereby providing protection for the safe operation of the vehicle. At the same time, it can also avoid directly powering off the vehicle at high voltage when a fault is found in the target wiring harness, thereby avoiding sudden stops of the vehicle and providing time to remind the driver and passengers to deal with the fault or stop to avoid danger.

[0054] It should be noted that the target harness, as a high-voltage harness, usually includes a high-voltage cable and a connector arranged at the end of the high-voltage cable. The connector at one end of the high-voltage cable can be used to connect to the battery management system, and the connector at the other end can be used to connect to the target electrical appliance to establish a connection between the high-voltage cable and the battery management system and the target electrical appliance. The poor contact of the target harness is usually caused by a virtual connection between the connector and the target electrical appliance or the battery management system or a loose short wire at the crimping part, which in turn causes an increase in resistance at the connector and forms local heating.

[0055] Therefore, the aforementioned reference pressure difference threshold can be combined with the actual specification parameters of the target wiring harness to establish a test bench for the vehicle high-voltage system, and obtain heating tests of the target wiring harness with different degrees of virtual connection.

[0056] Taking the high-voltage wiring harness connecting the BMS and MCU as the target wiring harness as an example, the temperature tolerance value of the target wiring harness can be obtained first. The temperature tolerance value of the target wiring harness can represent the maximum temperature that the wiring harness can withstand in a short time. Taking the target wiring harness whose insulation layer material is silicone, the connector insulation material is PA (Polyamide; nylon) and the textile sheath material of the cable is polyester fiber as an example, the temperature tolerance value of the wiring harness is 200°C; control the MCU to run at peak power, and the peak power is also the maximum operating power of the MCU. Taking the MCU used in the test as an example, when the MCU runs at peak power, the corresponding peak current is 260A, so the current passing through the target wiring harness is also 260A; control the degree of virtual connection at the connection between the target wiring harness and the MCU to obtain multiple corresponding virtual connection degrees. The voltage difference between the two ends of a target harness can be pre-set with multiple test voltage differences, such as 1V, 10V, 20V, 30V, 50V, etc., and then the virtual connection degree between the target harness and the MCU is adjusted in combination with each test voltage difference, so that the voltage difference between the two ends of the target harness during the test process meets the test voltage difference; the target harness is controlled to run the test time under each actual voltage interpolation, and the test time can be determined according to the tolerance time corresponding to the tolerance temperature value, which can usually be 10s; further obtain the test temperature value of the target harness when the test time is reached, and determine the test voltage difference corresponding to the test temperature value closest to the aforementioned tolerance temperature value among the multiple test temperature values ​​according to the corresponding relationship between the aforementioned test temperature value and the aforementioned test voltage difference as the reference voltage difference threshold, and the reference voltage difference threshold obtained by the test is 30V. Thus, the reference voltage difference threshold can be used to provide further reference for the fault judgment of the target harness and the heating protection of the vehicle high-voltage system.

[0057] In addition, in addition to determining the reference pressure difference threshold through the aforementioned heating test, the reference pressure difference threshold can also be set through other simulation analysis, empirical data statistics and other means to ensure that the target wiring harness does not exceed the tolerance temperature value of the target wiring harness in a short period of time when operating at the reference pressure difference threshold and the maximum operating current of the target electrical appliance. The aforementioned short time can be greater than or equal to 5s and less than or equal to 20s, for example 10s, 15s, etc. The specific method of obtaining the reference pressure difference threshold is not limited here.

[0058] In summary, the high-voltage system heating protection method provided in the embodiment of the present application obtains the actual voltage difference at both ends of the target wiring harness, and uses the actual voltage difference as the basis for judging whether the target wiring harness has poor contact. When the actual voltage difference at both ends of the target wiring harness is greater than the reference voltage difference threshold, it can be determined that there is poor contact between the target wiring harness and the battery management system or the target electrical appliance, thereby controlling the target electrical appliance to operate at a target operating power that is less than the current operating power to reduce the current passing through the target wiring harness. On the one hand, the heating power of the target wiring harness can be reduced to prevent the target wiring harness from heating up rapidly in the case of poor contact, so as to prevent the temperature of the target wiring harness from exceeding the maximum tolerance temperature of the target wiring harness material during operation, reduce the risk of vehicle fire due to local overheating of the target wiring harness, improve the safety of the vehicle, and protect the lives of the driver and passengers. On the other hand, when a fault is found in the target wiring harness, it can avoid directly powering off the vehicle with high voltage, so that the vehicle can remain running, providing time for reminding the driver and passengers to deal with the fault and stop to avoid danger, thereby improving the user experience of the vehicle.

[0059] In some feasible examples, the high-voltage system heating protection method may also include: when the target electrical appliance is running at the target power, controlling the vehicle's warning device to send out a warning message, so that the driver and passengers can promptly understand the fault situation, reminding the driver and passengers to stop and avoid risks and handle the fault, thereby further improving the safety of vehicle operation and enhancing the user experience of the vehicle.

[0060] It is understandable that the vehicle's warning device may be the vehicle's system maintenance light, vehicle speakers, central control display, etc., and the warning information may be light information, acoustic information, or text information, etc., without further limitation here.

[0061] In some examples, when the actual voltage difference is greater than a reference voltage difference threshold, the step of controlling the target electrical appliance to operate at a target operating power includes: obtaining a minimum operating voltage of the target electrical appliance; determining a target operating power based on the minimum operating voltage; and controlling the target electrical appliance to operate at the target operating power.

[0062] Specifically, the target electrical appliance usually has a minimum operating voltage, which refers to the minimum voltage that can maintain the operation of the target electrical appliance. Accordingly, the target electrical appliance will have an operating power corresponding to the aforementioned minimum operating voltage, and the operating power corresponding to the minimum operating voltage is used as the target power of the target electrical appliance, thereby ensuring that the target operating power is lower than the current operating power of the target electrical appliance, and then controlling the target electrical appliance to operate at the target operating power, avoiding direct high-voltage power-off of the vehicle, and improving the user experience of the vehicle. At the same time, the operating current of the target electrical appliance can be reduced by reducing the operating power of the target electrical appliance, thereby reducing the current passing through the target wiring harness, and reducing the heating power of the target wiring harness. Furthermore, based on the aforementioned control method, when the target wiring harness is in poor contact, the rapid heating of the target wiring harness can be avoided to a great extent, and the overheating of the target wiring harness can be avoided to cause a vehicle fire, thereby providing a guarantee for the safe operation of the vehicle.

[0063] It should be noted that the minimum operating voltage of the target electrical appliance can be obtained based on the actual specifications of the target electrical appliance. Taking the MCU used in the test of this method as an example, the minimum operating voltage of the MCU is 208V, and the corresponding target operating power is 10kW.

[0064] In some examples, the high-voltage system heating protection method also includes: when the actual voltage difference is greater than a reference voltage difference threshold, determining the adjusted current value of the target wiring harness based on the minimum operating voltage and the target operating power; determining the actual resistance value of the target wiring harness based on the adjusted current value and the actual voltage difference; obtaining the original resistance value of the target wiring harness; and determining the difference between the actual resistance value and the original resistance value as the virtual connection resistance value of the target wiring harness.

[0065] Specifically, when the actual voltage difference between the two ends of the target wiring harness is greater than the reference voltage difference threshold, the adjusted current value of the target wiring harness can be determined based on the minimum operating voltage and target operating power of the target electrical appliance. The adjusted current value is the actual current value of the target wiring harness after the target electrical appliance is converted from operating at the aforementioned current operating power to operating at the target operating power.

[0066] It can be understood that, since one end of the target wiring harness is connected to the target electrical appliance, the adjusted current value is the ratio of the target operating power to the minimum operating voltage.

[0067] According to the aforementioned adjusted current value and the actual voltage difference at both ends of the target wiring harness, the actual resistance value of the target wiring harness can be determined. The actual resistance value is also the ratio of the actual voltage difference to the adjusted current value. Since when the actual voltage difference at both ends of the target wiring harness is greater than the reference voltage difference threshold, the target wiring harness has poor contact, and thus the actual resistance value of the target wiring harness will be higher than the original resistance value of the target wiring harness. It can be understood that the original resistance value of the target wiring harness is also the sum of the target wiring harness's own wiring harness impedance and the contact impedance at the connection to the electrical appliance. Therefore, the additional impedance caused by poor contact of the target wiring harness can be determined based on the difference between the actual resistance value and the original resistance value, that is, the virtual connection resistance value of the target wiring harness. On the one hand, based on the virtual connection resistance value, further data reference can be provided for the heating protection of the high-voltage system; on the other hand, it is also convenient to judge the degree of fault of the target wiring harness by the numerical value of the virtual connection resistance value, and provide data reference for the subsequent maintenance of the target wiring harness.

[0068] In some examples, the high-voltage system heating protection method also includes: when the actual voltage difference is greater than a reference voltage difference threshold, obtaining an actual temperature value and a tolerable temperature value of the target wiring harness; determining an allowable temperature rise value of the target wiring harness based on the actual temperature value and the tolerable temperature value; determining an estimated temperature rise time of the target wiring harness based on the allowable temperature rise value and the virtual connection resistance value, the estimated temperature rise time being the time required for the temperature of the target wiring harness to rise from the actual temperature value to the tolerable temperature value.

[0069] Specifically, when the actual voltage difference is greater than the reference voltage difference threshold, the actual temperature value and the tolerable temperature value of the target wiring harness can be obtained. The actual temperature value can be obtained by real-time temperature monitoring of the target wiring harness. In combination with the foregoing, the tolerable temperature value can be determined according to the actual specification parameters of the target wiring harness, and thus the allowable temperature rise value of the target wiring harness can be determined according to the actual temperature value and the tolerable temperature value of the target wiring harness. The allowable temperature rise is the difference between the tolerable temperature value and the actual temperature value, and then the heat required for the target wiring harness to rise from the actual temperature value to the tolerable temperature value can be determined according to the allowable temperature rise value of the target wiring harness, and the target wiring harness can be determined according to the virtual connection resistance value. The heating power of the target wiring harness under the adjusted current value can be determined, and then according to the heat required for heating and the heating power, the time required for the temperature of the target wiring harness to rise from the actual temperature value to the tolerance temperature value can be determined, that is, the estimated heating time of the target wiring harness. According to the estimated heating time of the target wiring harness, the length of time that the target wiring harness can maintain safe operation when the target electrical appliance operates at the target operating power can be further determined. On the one hand, it can provide further data reference for the vehicle's thermal protection, and on the other hand, it can also facilitate the reminder of the driver and passengers to shut down the vehicle in time to avoid further danger, providing further protection for the life safety of the driver and passengers.

[0070] In some examples, when the actual voltage difference is greater than a reference voltage difference threshold, the step of controlling the target electrical appliance to operate at a target operating power also includes: controlling the target electrical appliance to operate at the target operating power for an expected heating time; when the expected heating time is reached, controlling the vehicle high voltage to power off.

[0071] Specifically, when the expected heating time of the target harness is determined, the target electrical appliance can be controlled to operate at the target operating power for the expected heating time, and when the expected heating time is reached, the vehicle high voltage is controlled to be powered off to stop the vehicle. It can be understood that the aforementioned vehicle refers to the vehicle to which the target electrical appliance and the target harness belong. Therefore, based on the aforementioned control method, when it is found that the target harness has poor contact, on the one hand, the target electrical appliance can be maintained to operate continuously by reducing the operating power of the target electrical appliance, thereby ensuring that the vehicle can operate continuously and avoiding the sudden stop of the vehicle due to the direct high voltage power-off of the vehicle; on the other hand, it can further prevent the target harness from over-operating in the case of poor contact, avoid overheating of the target harness, and reduce the possibility of causing a fire in the vehicle, thereby ensuring the safety of the vehicle and providing reaction time for the driver and passengers to stop and avoid danger, thereby improving the user experience of the vehicle.

[0072] In some examples, the step of obtaining an actual voltage difference between two ends of a target wiring harness includes: obtaining a first actual voltage value of a battery management system; obtaining a second actual voltage value of a target electrical appliance; and determining an actual voltage difference based on the first actual voltage value and the second actual voltage value.

[0073] Specifically, since the two ends of the target wiring harness are respectively connected to the battery management system and the target electrical appliance, the actual voltage value at one end of the target wiring harness has a high consistency with the first actual voltage value of the battery management system, and the actual voltage value at the other end of the target wiring harness has a high consistency with the second actual voltage value of the target electrical appliance. Therefore, the actual voltage difference between the two ends of the target wiring harness can be determined based on the first actual voltage value and the second actual voltage value, avoiding the configuration of a voltage monitoring device for the target wiring harness alone, thereby reducing the implementation cost of the thermal protection method.

[0074] It can be understood that, in combination with the foregoing, the target electrical appliance can be a DCDC and / or an MCU. New energy vehicles are usually equipped with a VCU (Vehicular Communication Unit). The VCU can be used to directly obtain the actual voltage information of the battery management system, DCDC and MCU, and then determine the first actual voltage value and the second actual voltage value based on the corresponding actual voltage information; at the same time, the actual voltage information of the battery management system, DCDC and MCU can also be read according to the vehicle's diagnostic instrument and CAN (Controller Area Network) information network to obtain the first actual voltage value and the second actual voltage value.

[0075] In some examples, the high-voltage system heating protection method further includes: when the actual voltage difference is less than or equal to the reference voltage difference threshold, controlling the target electrical appliance to operate at a current operating power.

[0076] Specifically, when the actual voltage difference is less than or equal to the reference voltage difference threshold, it indicates that the target wiring harness is in normal contact with the battery management system and the target electrical appliance, and no poor contact occurs. Thus, the target electrical appliance can be controlled to continue operating at the current operating power, ensuring the normal driving of the vehicle and providing further guarantee for improving the user experience of the vehicle.

[0077] like Figure 3 As shown, according to the second aspect of the embodiment of the present application, a high voltage system heating protection device 300 is proposed, comprising:

[0078] A first acquisition module 301 is used to acquire an actual voltage difference between two ends of a target wiring harness, where the target wiring harness is used to connect a battery management system and a target electrical appliance;

[0079] The first control module 302 is used to control the target electrical appliance to operate at a target operating power when the actual voltage difference is greater than a reference voltage difference threshold, and the target operating power is less than the current operating power of the target electrical appliance.

[0080] The high-voltage system heating protection device provided in the embodiment of the present application obtains the actual voltage difference between the two ends of the target wiring harness, and uses the actual voltage difference as the basis for judging whether the target wiring harness has poor contact. When the actual voltage difference between the two ends of the target wiring harness is greater than the reference voltage difference threshold, it can be determined that there is poor contact between the target wiring harness and the battery management system or the target electrical appliance, thereby controlling the target electrical appliance to operate at a target operating power that is less than the current operating power to reduce the current passing through the target wiring harness. On the one hand, the heating power of the target wiring harness can be reduced to prevent the target wiring harness from heating up rapidly in the case of poor contact, so as to prevent the temperature of the target wiring harness from exceeding the maximum tolerance temperature of the target wiring harness material during operation, reduce the risk of vehicle fire due to local overheating of the target wiring harness, improve the safety of the vehicle, and protect the lives of the driver and passengers. On the other hand, when a fault is found in the target wiring harness, it can avoid directly powering off the vehicle with high voltage, so that the vehicle can remain running, providing time for reminding the driver and passengers to deal with the fault and stop to avoid danger, thereby improving the user experience of the vehicle.

[0081] In some feasible examples, the high voltage system heating protection device 300 further includes:

[0082] The second control module is used to control the warning device of the vehicle to send out a warning message when the target electrical appliance is running at the target power.

[0083] In some feasible examples, the first control module 302 includes:

[0084] A first acquisition unit, used to acquire the minimum operating voltage of the target electrical appliance;

[0085] A first determining unit, used to determine a target operating power according to a minimum operating voltage;

[0086] The first control unit is used to control the target electrical appliance to operate at a target operating power.

[0087] In some feasible examples, the high voltage system heating protection device 300 further includes:

[0088] A first determination module, for determining a post-adjustment current value of a target wiring harness according to a minimum operating voltage and a target operating power when an actual voltage difference value is greater than a reference voltage difference threshold;

[0089] A second determination module is used to determine the actual resistance value of the target wiring harness according to the adjusted current value and the actual voltage difference;

[0090] A second acquisition module, used for acquiring an original resistance value of a target wiring harness;

[0091] The third determination module is used to determine the difference between the actual resistance value and the original resistance value as the virtual connection resistance value of the target wiring harness.

[0092] In some feasible examples, the high voltage system heating protection device 300 further includes:

[0093] A third acquisition module, used for acquiring an actual temperature value and a tolerance temperature value of the target wiring harness when the actual voltage difference value is greater than a reference voltage difference threshold;

[0094] A fourth determination module, used to determine an allowable temperature rise value of the target wiring harness according to the actual temperature value and the tolerance temperature value;

[0095] The fifth determination module is used to determine the expected temperature rise time of the target wiring harness according to the allowable temperature rise value and the virtual connection resistance value. The expected temperature rise time is the time required for the temperature of the target wiring harness to rise from the actual temperature value to the tolerance temperature value.

[0096] In some feasible examples, the first control module 302 further includes:

[0097] A second control unit is used to control the target electrical appliance to operate at a target operating power for an estimated heating time;

[0098] The third control unit is used to control the vehicle high voltage power-down when the expected heating time is reached.

[0099] In some feasible examples, the first acquisition module 301 includes:

[0100] A second acquisition unit, used to acquire a first actual voltage value of the battery management system;

[0101] A third acquisition unit, used to acquire a second actual voltage value of the target electrical appliance;

[0102] The second determining unit is used to determine the actual voltage difference according to the first actual voltage value and the second actual voltage value.

[0103] In some feasible examples, the high voltage system heating protection device 300 further includes:

[0104] The third control module is used to control the target electrical appliance to operate at the current operating power when the actual voltage difference is less than or equal to the reference voltage difference threshold.

[0105] According to a third aspect of an embodiment of the present application, a storage medium is proposed, the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the high-voltage system heating protection method proposed in any one of the first aspects above.

[0106] The storage medium proposed in the embodiment of the present application controls the device where the storage medium is located to execute the high-voltage system heating protection method proposed in any one of the first aspects mentioned above when the program is running. Therefore, the storage medium includes all the beneficial effects of the high-voltage system heating protection method proposed in any one of the first aspects mentioned above.

[0107] like Figure 4 As shown, according to the fourth aspect of an embodiment of the present application, an electronic device 400 is proposed, and the electronic device 400 includes at least one processor 401 and at least one memory 402 connected to the processor 401, wherein the processor 401 is used to call program instructions in the memory 402 to execute a high-voltage system heating protection method as proposed in any one of the first aspects above.

[0108] The electronic device 400 proposed in the embodiment of the present application, the processor 401 can call the program instructions in the memory 402 to execute the high-voltage system heating protection method proposed in any one of the first aspects above, so the electronic device 400 includes all the beneficial effects of the high-voltage system heating protection method proposed in any one of the first aspects above.

[0109] The present application is described with reference to the flowcharts and / or block diagrams of the methods, apparatuses, and electronic devices according to the embodiments of the present application; it should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions; these computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable process management device to generate a machine, so that the instructions executed by the processor of the computer or other programmable process management device generate instructions for implementing the process in the process Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0110] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0111] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the above-mentioned units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0112] In a typical configuration, an electronic device may include one or more processors (CPU), a memory, and a bus; the electronic device may also include an input / output interface, a network interface, and the like.

[0113] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip; the memory is an example of a storage medium.

[0114] Storage media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information; information can be computer-readable instructions, data structures, program modules or other data; examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device; as defined in this article, storage media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0115] The terms "first", "second", "third", "fourth", etc. (if any) in the description, claims and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; it should be understood that the data used in this way can be interchangeable under appropriate circumstances so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0116] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the order of the actions described, because according to the present application, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0117] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, product or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, product or apparatus; in the absence of further restrictions, the elements defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, product or apparatus that includes the elements.

[0118] Those skilled in the art should understand that the embodiments of the present application may be provided as methods, devices or electronic devices; therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects; moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0119] Computer program codes for performing operations of the embodiments of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Common Lisp, Python, C++, Objective-C, Smalltalk, Delphi, Java, Swift, C#, Perl, Ruby, JavaScript, and PHP, conventional procedural programming languages, such as Fortran, ALGOL, COBOL, PL / I, BASIC, Pascal, and C, and any other programming languages, such as Lisp, Tcl, Prolog, Visual Basic.NET, SQL, and R; the program codes may be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server; in the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (for example, via the Internet using an Internet service provider).

[0120] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of the claims of the present application.

Claims

1. A method for protecting a high voltage system from overheating, characterized in that: include: Acquiring an actual voltage difference between two ends of a target wiring harness, wherein the target wiring harness is used to connect a battery management system and a target electrical appliance; When the actual voltage difference is greater than the reference voltage difference threshold, controlling the target electrical appliance to operate at a target operating power, wherein the target operating power is less than a current operating power of the target electrical appliance; When the actual voltage difference is greater than the reference voltage difference threshold, the step of controlling the target electrical appliance to operate at the target operating power comprises: Obtaining the minimum operating voltage of the target electrical appliance; Determining the target operating power according to the minimum operating voltage; Controlling the target electrical appliance to operate at the target operating power; The high voltage system heating protection method further comprises: In a case where the actual voltage difference is greater than a reference voltage difference threshold, determining an adjusted current value of the target wiring harness according to the minimum operating voltage and the target operating power; Determining an actual resistance value of the target wiring harness according to the adjusted current value and the actual voltage difference; Obtaining an original resistance value of the target wiring harness; Determine that the difference between the actual resistance value and the original resistance value is the virtual connection resistance value of the target wiring harness; When the actual voltage difference is greater than a reference voltage difference threshold, obtaining an actual temperature value and a tolerance temperature value of the target wiring harness; Determining an allowable temperature rise value of the target wiring harness according to the actual temperature value and the tolerance temperature value; The estimated temperature rise time of the target wiring harness is determined according to the allowable temperature rise value and the virtual connection resistance value. The estimated temperature rise time is the time required for the temperature of the target wiring harness to rise from the actual temperature value to the tolerance temperature value.

2. The high voltage system heating protection method according to claim 1, characterized in that: When the actual voltage difference is greater than the reference voltage difference threshold, the step of controlling the target electrical appliance to operate at the target operating power further includes: Control the target electrical appliance to operate at the target operating power for the estimated heating time; When the estimated temperature rise time is reached, the vehicle high voltage is controlled to be powered off.

3. The high voltage system heating protection method according to claim 1 or 2, characterized in that: The step of obtaining the actual voltage difference between the two ends of the target wiring harness includes: Acquire a first actual voltage value of the battery management system; Acquiring a second actual voltage value of the target electrical appliance; The actual voltage difference is determined according to the first actual voltage value and the second actual voltage value.

4. The high voltage system heating protection method according to claim 1 or 2, characterized in that: Also includes: When the actual voltage difference is less than or equal to the reference voltage difference threshold, the target electrical appliance is controlled to operate at the current operating power.

5. A high voltage system heating protection device, characterized in that: include: A first acquisition module, used to acquire an actual voltage difference between two ends of a target wiring harness, where the target wiring harness is used to connect a battery management system and a target electrical appliance; A first control module, configured to control the target electrical appliance to operate at a target operating power when the actual voltage difference is greater than a reference voltage difference threshold, wherein the target operating power is less than a current operating power of the target electrical appliance; The first control module comprises: A first acquisition unit, used to acquire the minimum operating voltage of the target electrical appliance; A first determining unit, configured to determine the target operating power according to the minimum operating voltage; A first control unit, configured to control the target electrical appliance to operate at the target operating power; The high voltage system heating protection device also includes: A first determination module, configured to determine the adjusted current value of the target wiring harness according to the minimum operating voltage and the target operating power when the actual voltage difference is greater than a reference voltage difference threshold; A second determination module, configured to determine an actual resistance value of the target wiring harness according to the adjusted current value and the actual voltage difference; A second acquisition module, used for acquiring the original resistance value of the target wiring harness; A third determination module, configured to determine that the difference between the actual resistance value and the original resistance value is the virtual connection resistance value of the target wiring harness; A third acquisition module, configured to acquire an actual temperature value and a tolerance temperature value of the target wiring harness when the actual voltage difference value is greater than a reference voltage difference threshold; a fourth determination module, configured to determine an allowable temperature rise value of the target wiring harness according to the actual temperature value and the tolerance temperature value; The fifth determination module is used to determine the expected temperature rise time of the target wiring harness according to the allowable temperature rise value and the virtual connection resistance value, wherein the expected temperature rise time is the time required for the temperature of the target wiring harness to rise from the actual temperature value to the tolerance temperature value.

6. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the high-voltage system heating protection method according to any one of claims 1 to 4.

7. An electronic device, characterized in that: The electronic device includes at least one processor and at least one memory connected to the processor, wherein the processor is used to call program instructions in the memory to execute the high-voltage system heating protection method according to any one of claims 1 to 4.

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