Electric vehicle high-voltage heater protection method and device, electronic equipment and storage medium

Abstract

The application provides an electric vehicle high-voltage heater protection method and device, electronic equipment and a storage medium, and relates to the technical field of electric vehicles. The method comprises the following steps: in response to a stop running instruction for a high-voltage heater, detecting whether the high-voltage heater is in abnormal communication through a LIN line; if the high-voltage heater is in an abnormal communication state, monitoring the external temperature of the high-voltage heater within a preset time period and determining the external temperature difference; if the external temperature difference exceeds a preset safety threshold, sending high-voltage heater fault information to an electric control system, and controlling the vehicle to be powered off through the electric control system to perform dry burning fault protection of the high-voltage heater. The application avoids the risk of over-temperature or even fire caused by the fact that the heater cannot respond to the instruction to turn off the heater after the communication of the heater is lost, and improves the use safety of the heater of the electric vehicle.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a method, apparatus, electronic device, and storage medium for protecting a high-pressure heater in an electric vehicle. Background Technology

[0002] Functions such as battery pack heating, air conditioning system heating, and defrosting / defogging heating in electric vehicles are typically implemented using high-pressure heaters. When communication between the heater and the main node (air conditioning controller or other controllers) is lost, and the heater's IGBT experiences a short circuit, the heater continues to operate even when there is no heating requirement for the entire vehicle (the heater's water pump is not running / the blower is not operating during high-pressure PTC heating). Because the water circuit is not circulating / the blower is not running, heat cannot be dissipated, causing the heater to continue operating and resulting in heat accumulation. This can lead to the heater housing temperature exceeding the limit, and even pose a fire risk.

[0003] In related technologies, an overcurrent circuit breaker is usually connected to the high-voltage heater circuit of an electric vehicle as a protective element. However, this method cannot solve the problem of the heater continuing to operate when communication is lost and IGBT short-circuit faults, which may lead to overheating or even fire. Summary of the Invention

[0004] The purpose of this application is to provide a method, device, electronic device and storage medium for protecting high-pressure heaters in electric vehicles, so as to avoid the danger of overheating or even fire caused by the heater continuing to work when heating is not needed due to the inability to respond to the command to shut down the heater after the heater communication is lost, thereby improving the safety of electric vehicle heaters.

[0005] In a first aspect, the present invention provides a method for protecting a high-voltage heater in an electric vehicle, the method comprising:

[0006] After a stop command is issued for the high-pressure heater, the system checks the LIN bus status to see if there is a communication problem with the high-pressure heater.

[0007] If the high-pressure heater is in a communication abnormal state, the external temperature of the high-pressure heater is monitored within a preset time period to determine the external temperature difference;

[0008] If the external temperature difference exceeds the preset safety threshold, a high-pressure heater fault information is sent to the electronic control system, which then controls the vehicle to cut off power to protect against dry burning of the high-pressure heater.

[0009] In an optional implementation, a temperature sensor is installed on the high-pressure heater node, and the external temperature includes the outer casing temperature of the high-pressure heater; monitoring the external temperature of the high-pressure heater within a preset time period and determining the external temperature difference includes:

[0010] The temperature of the high-pressure heater casing is monitored by temperature sensors at the first and second moments, respectively.

[0011] The external temperature difference is determined based on the outer shell temperature at the first moment and the outer shell temperature at the second moment.

[0012] In an optional implementation, the external temperature includes the inlet and outlet coolant temperatures of the high-pressure heater; monitoring the external temperature of the high-pressure heater within a preset time period and determining the external temperature difference includes:

[0013] The temperature difference trend of the inlet and outlet coolant of the high-pressure heater is monitored by a temperature sensor within a preset time period.

[0014] The external temperature difference of the high-pressure heater is determined based on the trend of temperature difference change.

[0015] In an optional implementation, the temperature difference trend of the inlet and outlet coolant of the high-pressure heater is monitored by a temperature sensor within a preset time period, including:

[0016] The initial temperature of the coolant at the inlet of the high-pressure heater is monitored using a temperature sensor.

[0017] The second temperature of the coolant at the outlet of the high-pressure heater is monitored by a temperature sensor within a preset time period.

[0018] The temperature difference trend of the inlet and outlet coolant of the high-pressure heater within a preset time period is determined based on the second temperature and / or the first temperature.

[0019] In an optional implementation, determining the temperature difference trend of the inlet and outlet coolant of the high-pressure heater within a preset time period based on the second temperature and / or the first temperature includes:

[0020] The trend of the first temperature difference is determined based on the temperature difference of the first temperature of the inlet coolant of the high-pressure heater within a preset time period.

[0021] or,

[0022] The trend of the second temperature difference is determined based on the temperature difference between the second temperature of the coolant at the outlet of the high-pressure heater within a preset time period.

[0023] or,

[0024] The third temperature difference trend is determined based on the temperature difference between the second temperature of the coolant at the outlet of the high-pressure heater and the first temperature of the coolant at the inlet of the high-pressure heater within a preset time period.

[0025] In an optional implementation, detecting whether the high-voltage heater is experiencing communication abnormalities via the LIN line status includes:

[0026] If the master node of the high-pressure heater does not receive a LIN communication signal within the specified time, it is determined that the high-pressure heater communication is abnormal.

[0027] In an optional implementation, the method further includes, before monitoring the external temperature of the high-pressure heater within a preset time period:

[0028] Controls the start-up of the warm air water pump and the stop-run of the blower.

[0029] In a second aspect, the present invention provides a protection device for a high-voltage heater in an electric vehicle, the device comprising:

[0030] The communication status detection module is used to detect the communication status of the high-pressure heater via the LIN line after a stop command for the high-pressure heater is issued.

[0031] The external temperature monitoring module is used to monitor the external temperature of the high-pressure heater within a preset time period if the high-pressure heater is in a communication abnormal state, and to determine the external temperature difference.

[0032] The protection module is used to send a high-pressure heater fault information to the electronic control system if the external temperature difference exceeds a preset safety threshold. The electronic control system then controls the power to cut off the entire vehicle to protect against the dry burning fault of the high-pressure heater.

[0033] Thirdly, the present invention provides an electronic device including a processor and a memory, the memory storing computer-executable instructions that can be executed by the processor, the processor executing the computer-executable instructions to implement the electric vehicle high-pressure heater protection method of any of the foregoing embodiments.

[0034] Fourthly, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when invoked and executed by a processor, cause the processor to implement the electric vehicle high-pressure heater protection method of any of the foregoing embodiments.

[0035] The electric vehicle high-pressure heater protection method, device, electronic equipment, and storage medium provided in this application firstly detect whether the high-pressure heater is in communication abnormality by detecting the LIN line status after a stop operation command is issued for the high-pressure heater. If the high-pressure heater is in communication abnormality state, the external temperature of the high-pressure heater within a preset time period is monitored to determine the external temperature difference. If the external temperature difference exceeds a preset safety threshold, a high-pressure heater fault information is sent to the electronic control system, and the electronic control system controls the power to cut off the entire vehicle to protect against dry burning faults of the high-pressure heater. The above method first checks the communication status of the high-pressure heater after issuing a stop command. If the high-pressure heater loses communication, it means that the high-pressure heater cannot receive the stop command, thus allowing the high-pressure heater to continue operating even when there is no heating requirement. By monitoring the external temperature of the high-pressure heater, it can be determined whether the high-pressure heater is still working. If the external temperature difference within a preset time period exceeds a preset safety threshold, a message is sent to the electronic control system (VCU system) to enable the VCU system to control the vehicle to shut down in an emergency. This avoids the danger of overheating or even fire caused by the heater continuing to work when heating is not needed due to the inability to respond to the heater shutdown command after communication loss, thus improving the safety of electric vehicle heaters. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 A flowchart illustrating a method for protecting a high-voltage heater in an electric vehicle, as provided in this application embodiment;

[0038] Figure 2 A network topology diagram of a high-pressure air heater system provided in this application embodiment;

[0039] Figure 3 A flowchart illustrating a method for protecting a high-pressure air heater from dry burning based on the temperature difference between the outer casing and the casing, provided as an embodiment of this application;

[0040] Figure 4 Another flowchart for dry-burn protection of a high-pressure air heater based on the shell temperature difference is provided in this application embodiment;

[0041] Figure 5 A network topology diagram of a high-pressure coolant heater system provided in this application embodiment;

[0042] Figure 6 A schematic diagram of the inlet and outlet of a high-pressure coolant heater provided in an embodiment of this application;

[0043] Figure 7 A flowchart illustrating a method for protecting a high-pressure coolant heater from dry burning based on the temperature difference of the imported coolant, as provided in this application embodiment;

[0044] Figure 8 A flowchart illustrating a method for protecting a high-pressure coolant heater from dry burning based on the temperature difference of the outlet coolant, provided in this application embodiment;

[0045] Figure 9 A flowchart illustrating a method for protecting a high-pressure coolant heater from dry burning based on the temperature difference between the inlet and outlet coolants, provided in this application embodiment;

[0046] Figure 10 A structural diagram of a high-voltage heater protection device for an electric vehicle provided in this application embodiment;

[0047] Figure 11 This is a structural diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] Regarding the issue of high-voltage heaters in electric vehicles failing to shut down properly due to communication failures, resulting in the heaters continuing to operate even when there is no heating demand, and thus posing a risk of overheating or even fire, the relevant technologies only provide overcurrent circuit breakers as protective devices for the heaters in the high-voltage heater circuit. However, when communication between the heater and the main node (air conditioning controller or other controllers) is lost, the protector still cannot operate, thus failing to address the aforementioned risks or problems.

[0052] Based on this, embodiments of this application provide a method, device, electronic device, and storage medium for protecting high-pressure heaters in electric vehicles, thereby avoiding the danger of overheating or even fire caused by the heater continuing to operate when heating is not required due to the inability to respond to the instruction to shut down the heater after communication loss, thus improving the safety of electric vehicle heaters.

[0053] This application provides a method for protecting a high-voltage heater in an electric vehicle. (See also...) Figure 1 As shown, the method mainly includes the following steps:

[0054] Step S102: After the stop operation command for the high-pressure heater is issued, check whether the high-pressure heater is in communication abnormal by checking the LIN line status.

[0055] The aforementioned stop command for the high-pressure heater can be a control stop command issued by the high-pressure heater's master node (such as the air conditioning controller or other controllers). When such a master node issues a stop command for the high-pressure heater, it indicates that the vehicle currently has no heating requirement. When the vehicle has no heating requirement, the high-pressure heater water pump will not start; if the high-pressure heater is a fan-heated high-pressure heater, the blower will also not run.

[0056] Detecting communication abnormalities in the high-pressure heater via the LIN line status is to determine whether communication has been lost, i.e., whether the high-pressure heater is unable to receive control stop commands from the master node connected to the high-pressure heater. In one implementation, if the master node of the high-pressure heater does not receive a LIN communication signal within a specified time, it is determined that the high-pressure heater is experiencing a communication abnormality. This specified time can be, for example, 3 to 7 seconds, and can be adjusted adaptively according to actual conditions in practical applications.

[0057] Step S104: If the high-pressure heater is in a communication abnormal state, monitor the external temperature of the high-pressure heater within a preset time period to determine the external temperature difference.

[0058] The aforementioned preset time period may include a period of time after the stop operation command is issued, such as 10s to 20s after the stop operation command is issued. During this time, if the heater is normal, it will not continue to heat, and the temperature value will gradually decrease. If the heater malfunctions and cannot be shut down, and is still running, the high-pressure heater malfunction can be determined by monitoring the external temperature difference of the heater within the preset time period.

[0059] In one embodiment, the high-pressure heater may include a high-pressure air heater or a high-pressure coolant heater. Accordingly, when a high-pressure air heater is used, the external temperature can be the shell temperature of the high-pressure heater; when a high-pressure coolant heater is used, the external temperature can be the temperature of the coolant at the inlet and outlet of the high-pressure heater. The operating status of the high-pressure heater can be determined by the external temperatures corresponding to the start and end times of a preset time period.

[0060] Step S106: If the external temperature difference exceeds the preset safety threshold, send high-pressure heater fault information to the electronic control system and control the power outage of the whole vehicle through the electronic control system to protect against dry burning fault of the high-pressure heater.

[0061] In one implementation, when the external temperature difference is the temperature of the next moment minus the temperature of the previous moment, the preset safety threshold can be set to a value greater than 0; when the external temperature difference is the temperature of the previous moment minus the temperature of the next moment, the preset safety threshold can be set to a value less than 0, and in this case, exceeding refers to exceeding in the reverse direction, that is, exceeding in the direction away from 0.

[0062] By sending a high-pressure heater fault information to the electronic control system (VCU system), the entire vehicle can be powered off through the electronic control system, thereby forcing the high-pressure heater to shut down and avoiding safety hazards caused by the high-pressure heater working continuously, thus providing protection against dry burning faults of the high-pressure heater.

[0063] The electric vehicle high-pressure heater protection method provided in this application first determines the communication status of the high-pressure heater after issuing a stop command. If the high-pressure heater loses communication, it indicates that the high-pressure heater cannot receive the stop command, thus ensuring that the high-pressure heater continues to operate even when there is no heating requirement. By monitoring the external temperature of the high-pressure heater, it can be determined whether the high-pressure heater is still working. If the external temperature difference within a preset time period exceeds a preset safety threshold, information is sent to the electronic control system (VCU system) to enable the VCU system to control the vehicle to shut down in an emergency. This avoids the danger of overheating or even fire caused by the heater continuing to work when heating is not required due to the inability to respond to the heater shutdown command after communication loss, thus improving the safety of electric vehicle heaters.

[0064] The following provides a detailed description of the electric vehicle high-pressure heater protection method provided in the embodiments of this application.

[0065] Firstly, in an optional implementation, in order to ensure the safe operation of the electric vehicle's high-pressure heater and avoid the risk of fire, the heater pump can be turned on and the blower can be stopped before monitoring the external temperature of the high-pressure heater within a preset time period.

[0066] Furthermore, in order to achieve the technical effects of the embodiments of this application, a temperature sensor is provided on the high-pressure heater node. Figure 2 The network topology diagram of the high-pressure air heater is shown. When the high-pressure heater is a high-pressure air heater, the external temperature of the high-pressure air heater is collected by adding a temperature sensor (i.e., AC controller) to the master node of the high-pressure air heater. The external temperature includes the shell temperature of the high-pressure air heater.

[0067] In one embodiment, the external temperature of the high-pressure heater is monitored within a preset time period to determine the external temperature difference. In specific implementation, the outer casing temperature of the high-pressure heater can be monitored at a first moment and a second moment respectively using a temperature sensor, and the external temperature difference is determined based on the outer casing temperatures at the first moment and the second moment. The overall method flow using this approach is described in [link to method]. Figure 3 As shown, T 壳体2 -T 壳体1 ≥T set If the signal is lost, it indicates that communication has been lost and the high-voltage heater is still working. In this case, by sending heater fault information (i.e. heater IGBT short circuit fault information) to the VCU, the VCU can be powered down in an emergency.

[0068] When this method is implemented, if the high-pressure heater is a high-pressure air heater, the blower can also be stopped before the temperature difference of the outer casing is determined. See [link to relevant documentation]. Figure 4 As shown, this method can further avoid safety threats caused by continuous heating and improve the safety of electric vehicle air conditioning systems and even the entire vehicle.

[0069] This embodiment adds the acquisition of heater shell temperature by the high-pressure heater master node. When the heater master node determines that the heater is in an abnormal working state, it reports it to the vehicle VCU. After receiving the abnormal working state of the heater, the vehicle VCU performs emergency power-down processing. In this way, by monitoring the abnormal current state of the heater circuit, it feeds back to the master node for emergency processing, avoiding the risk of fire caused by abnormal heater operation.

[0070] The monitored external temperature can also be the inlet and outlet coolant temperature of the high-pressure heater. In this case, the high-pressure heater used is a high-pressure coolant heater. For the temperature sensor settings, please refer to [link / reference needed]. Figure 5The high-pressure coolant heater system network topology diagram shown illustrates that when heater communication is lost, the AC sensor monitors the coolant temperature at the heater inlet and outlet. In one embodiment, when monitoring the external temperature of the high-pressure heater within a preset time period and determining the external temperature difference, if the coolant circuit water temperature T of the heater shows an upward trend within a certain period, it indicates an abnormality in the high-pressure circuit of the high-pressure coolant heater, and the AC reports a heater IGBT fault to the VCU. In specific implementation, this may include the following steps 1.1) and 1.2):

[0071] Step 1.1): Monitor the temperature difference trend of the inlet and outlet coolant of the high-pressure heater within a preset time period using a temperature sensor. See the schematic diagram of the inlet and outlet of the high-pressure heater. Figure 6 As shown.

[0072] Step 1.2) Determine the external temperature difference of the high-pressure heater based on the temperature difference change trend.

[0073] Regarding step 1.1) above, in specific implementation, steps 1.1.1) to 1.1.3) may be further included:

[0074] Step 1.1.1): Monitor the first temperature of the coolant at the inlet of the high-pressure heater using a temperature sensor;

[0075] Step 1.1.2): Monitor the second temperature of the coolant at the outlet of the high-pressure heater using a temperature sensor within a preset time period;

[0076] Step 1.1.3) Determine the temperature difference trend of the inlet and outlet coolant of the high-pressure heater within a preset time period based on the second temperature and / or the first temperature.

[0077] Regarding step 1.1.3), when determining the temperature difference trend of the inlet and outlet coolant of the high-pressure heater within a preset time period based on the second temperature and / or the first temperature, the following three methods can be used:

[0078] Method 1: Determine the trend of the first temperature difference based on the temperature difference of the first temperature of the coolant at the high-pressure heater inlet within a preset time period. See the detailed operation procedure below. Figure 7 As shown. The trend of the first temperature difference is T. in2 -T in1 If T in2 -T in1 ≥T set If the temperature sensor sends a short-circuit fault message to the VCU for the heater IGBT, the VCU will perform an emergency power-off procedure.

[0079] Method 2: Determine the trend of the second temperature difference based on the temperature difference of the second temperature of the coolant at the high-pressure heater outlet within a preset time period. See the detailed operation procedure below. Figure 8 As shown. The trend of the second temperature difference is T. out2 -T out1 If T out2 -T out1 ≥T set If the temperature sensor sends a short-circuit fault message to the VCU for the heater IGBT, the VCU will perform an emergency power-off procedure.

[0080] Method 3: Determine the third temperature difference trend based on the temperature difference between the second temperature of the coolant at the high-pressure heater outlet and the first temperature of the coolant at the high-pressure heater inlet within a preset time period. See the detailed operation procedure below. Figure 9 As shown. The trend of the third temperature difference can be expressed as (T in2 +T out2 ) / 2-(T in1 +T out1 ) / 2, if (T) in2 +T out2 ) / 2-(T in1 +T out1 ) / 2≥T set If the temperature sensor sends a short-circuit fault message to the VCU for the heater IGBT, the VCU will perform an emergency power-off procedure.

[0081] In the above manner, the coolant temperature sensors at the heater inlet and outlet can be connected through the high-pressure heater circuit, and the main node AC controller can collect the coolant temperature sensor signals.

[0082] Furthermore, the temperature collection period (i.e., the aforementioned preset time period) in this application embodiment can be specifically calibrated. For example, the average value can be taken after collecting temperature values ​​for 10 seconds after an interval of 20 seconds.

[0083] In this embodiment, inlet and outlet water temperature sensors are connected to the high-pressure coolant heater circuit, and the main node AC controller collects and judges the abnormal conditions of the high-pressure electrical circuit and feeds back to the VCU in real time via CAN signal. After the vehicle VCU receives the abnormal working state of the heater, it performs emergency power-off processing, which can avoid the risk of fire caused by abnormal heater operation.

[0084] Based on the above method embodiments, this application also provides a protection device for a high-voltage heater in an electric vehicle, see [link to relevant documentation]. Figure 10 As shown, the device mainly includes the following parts:

[0085] The communication status detection module 1002 is used to detect the communication status of the high-pressure heater via the LIN line status after a stop operation command for the high-pressure heater is issued.

[0086] The external temperature monitoring module 1004 is used to monitor the external temperature of the high-pressure heater within a preset time period and determine the external temperature difference if the high-pressure heater is in a communication abnormal state.

[0087] The protection module 1006 is used to send a high-pressure heater fault information to the electronic control system if the external temperature difference exceeds a preset safety threshold, and then control the power outage of the whole vehicle through the electronic control system to protect against the dry burning fault of the high-pressure heater.

[0088] The electric vehicle high-pressure heater protection device provided in this application first determines the communication status of the high-pressure heater after issuing a stop command. If the high-pressure heater loses communication, it means that the high-pressure heater cannot receive the stop command, thus ensuring that the high-pressure heater continues to operate even when there is no heating requirement. By monitoring the external temperature of the high-pressure heater, it can be determined whether the high-pressure heater is still working. If the external temperature difference within a preset time period exceeds a preset safety threshold, information is sent to the electronic control system (VCU system) to enable the VCU system to control the vehicle to shut down in an emergency. This avoids the danger of overheating or even fire caused by the heater continuing to work when heating is not required due to the inability to respond to the heater shutdown command after communication loss, thus improving the safety of electric vehicle heaters.

[0089] In some embodiments, a temperature sensor is provided on the high-pressure heater node, and the external temperature includes the casing temperature of the high-pressure heater; the external temperature monitoring module 1004 is also used for:

[0090] The temperature of the high-pressure heater's outer casing is monitored by a temperature sensor at the first and second time points respectively; the external temperature difference is determined based on the outer casing temperatures at the first and second time points.

[0091] In some embodiments, the external temperature includes the inlet and outlet coolant temperatures of the high-pressure heater; the external temperature monitoring module 1004 is also used for:

[0092] The temperature difference trend of the inlet and outlet coolant of the high-pressure heater is monitored by a temperature sensor within a preset time period; the external temperature difference of the high-pressure heater is determined based on the temperature difference trend.

[0093] In some embodiments, the external temperature monitoring module 1004 is further used for:

[0094] The first temperature of the coolant at the inlet of the high-pressure heater is monitored by a temperature sensor; the second temperature of the coolant at the outlet of the high-pressure heater is monitored by a temperature sensor within a preset time period; and the temperature difference trend of the coolant at the inlet and outlet of the high-pressure heater within the preset time period is determined based on the second temperature and / or the first temperature.

[0095] In some embodiments, the external temperature monitoring module 1004 is further used for:

[0096] The first temperature difference trend is determined based on the temperature difference between the first temperature of the coolant at the inlet of the high-pressure heater and the first temperature of the coolant at the inlet of the high-pressure heater within a preset time period; or, the second temperature difference trend is determined based on the temperature difference between the second temperature of the coolant at the outlet of the high-pressure heater and the first temperature of the coolant at the inlet of the high-pressure heater within a preset time period; or, the third temperature difference trend is determined based on the temperature difference between the second temperature of the coolant at the outlet of the high-pressure heater and the first temperature of the coolant at the inlet of the high-pressure heater within a preset time period.

[0097] In some implementations, the communication status detection module 1002 is further configured to:

[0098] If the master node of the high-pressure heater does not receive a LIN communication signal within a specified time, it is determined that the high-pressure heater communication is abnormal.

[0099] In some embodiments, before monitoring the external temperature of the high-pressure heater within a preset time period, the device further includes a control module for:

[0100] Controls the start-up of the warm air water pump and the stop-run of the blower.

[0101] The electric vehicle high-pressure heater protection device provided in this application has the same implementation principle and technical effect as the aforementioned method embodiment. For the sake of brevity, any parts not mentioned in the embodiment of the electric vehicle high-pressure heater protection device can be referred to the corresponding content in the aforementioned electric vehicle high-pressure heater protection method embodiment.

[0102] This application also provides an electronic device, such as... Figure 11 The diagram shows the structure of the electronic device 100, which includes a processor 111 and a memory 110. The memory 110 stores computer-executable instructions that can be executed by the processor 111. The processor 111 executes the computer-executable instructions to implement any of the above-mentioned electric vehicle high-pressure heater protection methods.

[0103] exist Figure 11 In the illustrated embodiment, the electronic device further includes a bus 112 and a communication interface 113, wherein the processor 111, the communication interface 113, and the memory 110 are connected via the bus 112.

[0104] The memory 110 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 113 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc. The bus 112 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus 112 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 11 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0105] Processor 111 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 111 or by software instructions. The processor 111 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in the memory. The processor 111 reads the information in the memory and, in conjunction with its hardware, completes the steps of the electric vehicle high-pressure heater protection method of the aforementioned embodiment.

[0106] This application also provides a computer-readable storage medium storing computer-executable instructions. When these computer-executable instructions are called and executed by a processor, they cause the processor to implement the above-described electric vehicle high-voltage heater protection method. For specific implementation details, please refer to the foregoing method embodiments, which will not be repeated here.

[0107] The computer program product of the electric vehicle high-voltage heater protection method, device, electronic device and storage medium provided in the embodiments of this application includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the preceding method embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0108] Unless otherwise specifically stated, the relative steps, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application.

[0109] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0110] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0111] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0112] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for protecting a high-voltage heater in an electric vehicle, characterized in that, The method includes: After a stop command is issued for the high-pressure heater, the system checks whether the high-pressure heater is experiencing a communication abnormality via the LIN line status. If the high-pressure heater is in a communication abnormality state, the external temperature of the high-pressure heater is monitored within a preset time period to determine the external temperature difference; If the external temperature difference exceeds a preset safety threshold, a high-pressure heater fault information is sent to the electronic control system, which then controls the vehicle to cut off power to protect against dry burning of the high-pressure heater. A temperature sensor is installed on the high-pressure heater node, and the external temperature includes the shell temperature of the high-pressure heater; monitoring the external temperature of the high-pressure heater within a preset time period and determining the external temperature difference includes: monitoring the shell temperature of the high-pressure heater at a first time and a second time respectively using the temperature sensor; and determining the external temperature difference based on the shell temperature corresponding to the first time and the second time. The external temperature includes the inlet and outlet coolant temperatures of the high-pressure heater; monitoring the external temperature of the high-pressure heater within a preset time period and determining the external temperature difference includes: monitoring the temperature difference trend of the inlet and outlet coolant of the high-pressure heater within a preset time period using the temperature sensor; and determining the external temperature difference of the high-pressure heater based on the temperature difference trend. Monitoring the temperature difference trend of the inlet and outlet coolant of the high-pressure heater within a preset time period using the temperature sensor includes: determining a third temperature difference trend based on the temperature difference between the outlet coolant and the inlet coolant of the high-pressure heater within a preset time period; the third temperature difference trend is (T in2 +T out2 ) / 2-(T in1 +T out1 ) / 2, if (T) in2 +T out2 ) / 2-(T in1 +T out1 ) / 2≥T set If the temperature sensor fails, it will send a high-pressure heater fault message to the electronic control system.

2. The method for protecting a high-voltage heater in an electric vehicle according to claim 1, characterized in that, Detecting whether the high-pressure heater has a communication problem via LIN line status includes: If the master node of the high-pressure heater does not receive a LIN communication signal within a specified time period, it is determined that the high-pressure heater communication is abnormal.

3. The method for protecting a high-voltage heater in an electric vehicle according to claim 1, characterized in that, Before monitoring the external temperature of the high-pressure heater within a preset time period, the method further includes: Controls the start-up of the warm air water pump and the stop-run of the blower.

4. A protection device for a high-pressure heater in an electric vehicle, characterized in that, The device includes: The communication status detection module is used to detect the communication status of the high-pressure heater through the LIN line status after a stop operation command for the high-pressure heater is issued. An external temperature monitoring module is used to monitor the external temperature of the high-pressure heater within a preset time period and determine the external temperature difference if the high-pressure heater is in a communication abnormal state. The protection module is used to send high-pressure heater fault information to the electronic control system if the external temperature difference exceeds a preset safety threshold, and then control the power outage of the whole vehicle through the electronic control system to protect against dry burning fault of the high-pressure heater. A temperature sensor is installed on the high-pressure heater node, and the external temperature includes the shell temperature of the high-pressure heater; the external temperature monitoring module is also used to: monitor the shell temperature of the high-pressure heater at a first time and a second time respectively using the temperature sensor; and determine the external temperature difference based on the shell temperature corresponding to the first time and the second time. The external temperature includes the inlet and outlet coolant temperatures of the high-pressure heater; the external temperature monitoring module is also used to: monitor the temperature difference trend of the inlet and outlet coolant of the high-pressure heater within a preset time period using the temperature sensor; and determine the external temperature difference of the high-pressure heater based on the temperature difference trend. The external temperature monitoring module is also used to: determine a third temperature difference trend based on the temperature difference between the outlet coolant temperature and the inlet coolant temperature of the high-pressure heater within a preset time period; the third temperature difference trend is (T in2 +T out2 ) / 2-(T in1 +T out1 ) / 2, if (T) in2 +T out2 ) / 2-(T in1 +T out1 ) / 2≥T set If the temperature sensor fails, it will send a high-pressure heater fault message to the electronic control system.

5. An electronic device, characterized in that, The device includes a processor and a memory, the memory storing computer-executable instructions that can be executed by the processor, the processor executing the computer-executable instructions to implement the electric vehicle high-pressure heater protection method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when invoked and executed by a processor, cause the processor to implement the electric vehicle high-pressure heater protection method according to any one of claims 1 to 3.

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