High-pressure water heating type PTC heater over-temperature fault judgment method and device

Abstract

The application discloses a high-pressure water heating type PTC heater over-temperature fault judgment method and device, wherein the high-pressure water heating type PTC heater over-temperature fault judgment method comprises the following steps: obtaining the working condition state of a PTC heater, wherein the working condition state comprises a first state, a second state and a third state; then, according to the working condition state of the PTC heater, a fault strategy database is inquired; a fault judgment mode corresponding to the working condition state of the PTC heater is obtained; the first state and the third state represent that the duty cycle needs to be judged after the PTC heater receives an enabling signal; the second state represents that the PTC heater does not receive the enabling signal; the fault strategy database comprises internal over-temperature judgment modes and external over-temperature judgment modes corresponding to the three states respectively; the application regards the inlet (outlet) water temperature over-temperature fault of the PTC heater during working and non-working as two separate fault records, can support the problem analysis of PTC failure caused by external high temperature, and is convenient for the vehicle end to make corresponding strategy adjustment.

Description

Technical Field

[0001] This disclosure generally relates to the field of PTC heater over-temperature judgment, and specifically to a method and device for judging over-temperature faults in a high-pressure water-heating PTC heater. Background Technology

[0002] In new energy electric vehicles, high-pressure water-heating PTC (Positive Temperature Coefficient) heaters are increasingly widely used. Water temperature sensors are generally installed at the inlet and outlet of high-pressure water-heating PTC heaters to collect the inlet and outlet water temperatures. At the same time, in order to prevent the PTC heater from being damaged by excessively high water temperature, the PTC heater has implemented a fault protection strategy for inlet (outlet) water temperature overheating faults. This allows the PTC heater to automatically shut down when it detects that the inlet (outlet) water temperature has reached the fault threshold, thereby protecting the hardware of the PTC heater product.

[0003] Traditional inlet / outlet water temperature fault detection logic only checks for overheating when the PTC heater is operational. When the inlet / outlet temperature exceeds the overheat threshold, the PTC heater shuts down. However, in range-extended or plug-in hybrid electric vehicles, where the passenger compartment or battery heating utilizes engine waste heat, the PTC heater will not operate and will not report an overheating fault if the engine water temperature is too high when the vehicle is in a mode utilizing only engine waste heat. In this case, if the PTC heater remains in an overheated state for an extended period, it may damage internal hardware components. Therefore, we provide a method and device for detecting overheating faults in high-pressure water-heated PTC heaters to solve the above problems. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a method for judging over-temperature faults of high-pressure water-heated PTC heaters that can support PTC heater failure analysis.

[0005] In a first aspect, this application provides a method for judging over-temperature faults in a high-pressure water-heating PTC heater, comprising the following steps:

[0006] The operating status of the PTC heater is obtained, including either a first state or a second state. The first state represents that the PTC heater has received an enable signal and the duty cycle value of the PTC heater is greater than or equal to a first preset threshold. The second state represents that the PTC heater has not received an enable signal.

[0007] Based on the operating condition of the PTC heater, the fault strategy database is queried to obtain the fault judgment mode corresponding to the operating condition of the PTC heater; the fault strategy database includes at least: a first state and an internal over-temperature judgment mode corresponding to the first state; a second state and an external over-temperature judgment mode corresponding to the second state.

[0008] Perform the steps of the fault diagnosis mode to determine whether the PTC heater has an over-temperature fault.

[0009] According to the technical solution provided in the embodiments of this application, the operating state further includes: a third state, wherein the third state represents that the PTC heater receives an enable signal and the duty cycle value of the PTC heater is less than a first preset threshold.

[0010] The fault strategy database also includes: a third state and an external over-temperature judgment mode corresponding to the third state.

[0011] According to the technical solution provided in the embodiments of this application, the steps of the external over-temperature judgment mode corresponding to the second state and the external over-temperature judgment mode corresponding to the third state both include:

[0012] Obtain the first temperature value at the inlet or outlet of the PTC heater;

[0013] Based on the first temperature value, determine whether the PTC heater is in an external overheating state.

[0014] According to the technical solution provided in the embodiments of this application, determining whether the PTC heater is in an external over-temperature state based on the first temperature value includes:

[0015] When the first temperature value is determined to be greater than the second preset threshold and continues for a first preset duration, a first fault message is generated. The first fault message is used to indicate that the PTC heater is in an external over-temperature state.

[0016] According to the technical solution provided in the embodiments of this application, the steps of the internal over-temperature judgment mode corresponding to the first state include:

[0017] Obtain the second temperature value of the PTC heater inlet or outlet;

[0018] If the second temperature value is determined to be greater than the third preset threshold and continues for a first preset duration, a second fault message is generated. The second fault message is used to indicate that the PTC heater is in an internal over-temperature state.

[0019] According to the technical solution provided in the embodiments of this application, the fault judgment mode is used to guide the vehicle to select a fault adjustment strategy. The fault adjustment strategy includes: reducing the utilization rate of the vehicle's external heat source corresponding to the external over-temperature judgment mode and reducing the internal heating value of the PTC heater corresponding to the internal over-temperature judgment mode.

[0020] According to the technical solution provided in the embodiments of this application, the step of obtaining the operating condition status of the PTC heater further includes:

[0021] Receive the start signal sent by the vehicle control terminal, and after a second preset duration, obtain the operating status of the temperature sensor of the PTC heater;

[0022] Based on the operating status of the temperature sensor, determine whether to acquire the operating status of the PTC heater.

[0023] Secondly, this application provides a device for determining over-temperature faults in a high-pressure water-heating PTC heater, comprising:

[0024] The PTC heater operating condition acquisition module is configured to acquire the operating condition status of the PTC heater. The operating condition status includes either a first state or a second state. The first state represents that the PTC heater has received an enable signal and the duty cycle value of the PTC heater is greater than or equal to a first preset threshold. The second state represents that the PTC heater has not received an enable signal.

[0025] The fault strategy selection module is configured to query the fault strategy database based on the operating condition of the PTC heater and obtain the fault judgment mode corresponding to the operating condition of the PTC heater; the fault strategy database includes: a first state and an internal over-temperature judgment mode corresponding to the first state; a second state and an external over-temperature judgment mode corresponding to the second state.

[0026] The fault judgment execution module is configured to execute the steps of the fault judgment mode to determine whether the PTC heater has an over-temperature fault.

[0027] Thirdly, this application provides a server, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the above-described method for judging over-temperature faults in a high-pressure water-heated PTC heater.

[0028] Fourthly, this application provides a computer-readable storage medium having a computer program, which, when executed by a processor, implements the steps of the above-described method for judging over-temperature faults in a high-pressure water-heating PTC heater.

[0029] In summary, this technical solution specifically discloses a method and device for judging over-temperature faults in a high-pressure water-heated PTC heater. The method for judging over-temperature faults in a high-pressure water-heated PTC heater includes the following steps: obtaining the operating status of the PTC heater, which can be initially divided into a first state and a second state; then, based on the operating status of the PTC heater, querying the fault strategy database and obtaining the fault judgment mode corresponding to the operating status of the PTC heater; wherein, when the PTC heater is in the first state, the PTC heater can receive an enable signal and the duty cycle value of the PTC heater is greater than or equal to a first preset threshold, while in the second state, the PTC heater does not receive an enable signal; the aforementioned fault strategy database includes, respectively, an internal over-temperature judgment mode corresponding to the first state and an external over-temperature judgment mode corresponding to the second state.

[0030] This application records the overheating fault of the inlet (outlet) water temperature in the working state of the PTC heater and the overheating fault of the inlet (outlet) water temperature in the non-working state as two separate fault records. This can effectively solve the problem that the PTC heater does not report the overheating fault signal when its internal hardware components are damaged due to overheating caused by external heat source (engine waste heat) in the non-working state. Attached Figure Description

[0031] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 This is a flowchart of a method for judging over-temperature faults in a high-pressure water-heating PTC heater.

[0033] Figure 2 This is a schematic diagram of a high-pressure water-heating PTC heater over-temperature fault detection device.

[0034] Figure 3 This is a schematic diagram of a server-side principle.

[0035] The following numbers are labeled in the diagram: 501, CPU; 502, ROM; 503, RAM; 504, Bus; 505, I / O interface; 506, Input section; 507, Output section; 508, Storage section; 509, Communication section; 510, Driver; 511, Removable media. Detailed Implementation

[0036] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Example 1

[0039] Please refer to Figure 1 The flowchart shown is a first embodiment of a method for judging over-temperature faults in a high-pressure water-heated PTC heater provided in this application. This method is applicable to situations where PTC heaters frequently experience over-temperature faults and can be executed by the vehicle controller. Combined with... Figure 1 The method includes the following steps:

[0040] S100: Obtain the operating status of the PTC heater, which includes either the first state or the second state.

[0041] The first state represents that the PTC heater has received an enable signal and the duty cycle value of the PTC heater is greater than or equal to a first preset threshold; the second state represents that the PTC heater has not received an enable signal; optionally, the first preset threshold is 10%.

[0042] Specifically, the PTC heater is a high-pressure water-heating PTC heater. Correspondingly, the first state in the operating conditions refers to: the PTC heater receiving an enable signal from the controller and the PTC heater's duty cycle value being greater than or equal to a first preset threshold. Here, the enable signal is the controller's permission signal, and the PTC heater's duty cycle represents its power, which is also a condition for determining whether the PTC heater is in a working state, thus serving as a condition for distinguishing fault diagnosis modes. The second state in the operating conditions refers to: the PTC heater not receiving an enable signal from the controller, i.e., the PTC heater is in a non-working state at this time.

[0043] Optionally, the controller is an electric vehicle control unit (VCU), which is the main controller of the vehicle power system and the core control component of the entire vehicle. It collects accelerator pedal signals, brake pedal signals and other component signals, makes corresponding judgments, and controls the actions of the lower-level component controllers to drive the vehicle to drive normally.

[0044] S200: Based on the operating condition of the PTC heater, query the fault strategy database to obtain the fault judgment mode corresponding to the operating condition of the PTC heater.

[0045] The fault strategy database includes at least: a first state and an internal over-temperature judgment mode corresponding to the first state; a second state and an external over-temperature judgment mode corresponding to the second state.

[0046] Specifically, the structure of the aforementioned fault strategy database is shown in Table 1:

[0047] Table 1. Structure of the Fault Strategy Database

[0048] First state Second state Third state Internal over-temperature judgment mode External over-temperature judgment mode External over-temperature judgment mode

[0049] The structure of the fault strategy database in Table 1 above will now be explained:

[0050] When the PTC heater receives an enable signal and the duty cycle value of the PTC heater is greater than or equal to the first preset threshold, the operating state of the PTC heater is the first state. According to the fault strategy database, the over-temperature fault judgment mode of the PTC heater can be confirmed as the internal over-temperature judgment mode. The internal over-temperature judgment mode can be understood as the over-temperature fault caused by the internal heating element of the PTC heater when it is in working state.

[0051] When the PTC heater does not receive an enable signal, the PTC heater is in the second state. According to the fault strategy database, the over-temperature fault judgment mode of the PTC heater can be confirmed as the external over-temperature judgment mode. The external over-temperature judgment mode can be understood as the PTC heater over-temperature fault caused by external heat sources in the vehicle that affect the PTC heater when the PTC heater is not in working state. For example, the waste heat utilization rate of the vehicle engine is high, causing the PTC heater to be subjected to high temperature impact.

[0052] When the PTC heater receives an enable signal and the duty cycle value of the PTC heater is less than the first preset threshold, the operating state of the PTC heater is the third state. According to the fault strategy database, the over-temperature fault judgment mode of the PTC heater can be confirmed as the external over-temperature judgment mode.

[0053] In summary, by determining whether the PTC heater receives an enable signal and whether the duty cycle of the PTC heater after receiving the enable signal is greater than or equal to the first preset threshold, the over-temperature fault judgment mode can be selected. This ensures that when the PTC heater is not in operation, it can still report over-temperature faults, thereby protecting the PTC heater hardware. It can also separately record the frequency of PTC heater over-temperature faults caused by internal or external over-temperature, which is convenient for guiding the strategy adjustment at the vehicle end.

[0054] S300: Execute the steps of the fault judgment mode to determine whether the PTC heater has an over-temperature fault.

[0055] As shown in Table 1, the fault strategy database structure includes the following operating conditions: the third state, which represents that the PTC heater has received an enable signal and the duty cycle value of the PTC heater is less than the first preset threshold.

[0056] Specifically, the PTC heater being in the third state also corresponds to the external over-temperature judgment mode, for the following reasons: (1) At this time, the PTC heater has a small duty cycle and may be in a non-working state, so the reported fault information at this time must be caused by an external heat source; (2) If the PTC heater is in a working state after receiving the enable signal, but because the PTC heater has a small duty cycle at this time, the temperature it generates is not enough to make the temperature value of the PTC heater inlet or outlet exceed the third preset threshold and generate the second fault information, so the fault information at this time is caused by the external heat source causing it to be subjected to high temperature impact; In summary, the PTC heater being in the third state corresponds to the external over-temperature judgment mode.

[0057] Specifically, the steps of the external over-temperature judgment mode corresponding to the second state and the external over-temperature judgment mode corresponding to the third state both include: obtaining the first temperature value of the PTC heater inlet or outlet; and determining whether the PTC heater is in an external over-temperature state based on the first temperature value.

[0058] Further, the step of determining whether the PTC heater is in an external over-temperature state based on the first temperature value includes:

[0059] When the first temperature value is determined to be greater than the second preset threshold and continues for a first preset duration, a first fault message is generated. The first fault message is used to indicate that the PTC heater is in an external over-temperature state.

[0060] In practice, the second preset threshold is generally selected between 100 and 110 degrees Celsius; the first preset duration is between 2 and 3 seconds.

[0061] Specifically, the steps of the internal over-temperature judgment mode corresponding to the first state include: obtaining the second temperature value of the PTC heater inlet or outlet; determining that the second temperature value is greater than a third preset threshold and continues for a first preset duration, generating second fault information, which is used to indicate that the PTC heater is in an internal over-temperature state.

[0062] In practice, the third preset threshold is generally selected between 90 and 100 degrees Celsius. It can be seen that the third preset threshold is smaller than the second preset threshold. This is because the temperature generated by the internal heating element of the PTC heater causes greater damage to the PTC heater itself, while the external heat source causes relatively less damage. Therefore, the over-temperature threshold of the PTC heater will be lower in the internal over-temperature judgment mode, that is, the third preset threshold will be lower than the second threshold, thereby protecting the internal components of the PTC heater to a greater extent.

[0063] Specifically, the fault judgment mode is used to guide the vehicle to select a fault adjustment strategy. The fault adjustment strategy includes: reducing the utilization rate of the vehicle's external heat source corresponding to the external over-temperature judgment mode and reducing the internal heating value of the PTC heater corresponding to the internal over-temperature judgment mode.

[0064] In practical applications, the above-mentioned fault adjustment strategy is as follows: If the PTC heater fails later and the analysis shows that the cause of the failure is frequent high-temperature impact, the fault adjustment strategy is selected by referring to the frequency of occurrence of the first fault information and the second fault information in the fault judgment mode. Among them, if the first fault information occurs frequently, it means that the PTC heater is often subjected to high-temperature impact from external heat sources. At this time, the waste heat utilization rate in the engine waste heat mode of the vehicle thermal management system can be adjusted downward to avoid the PTC heater being subjected to excessive high-temperature impact and to improve the service life of the PTC heater. If the second fault information occurs frequently, it means that the PTC heater is often subjected to high-temperature impact from internal heat sources, which can be understood as high-temperature impact from its internal heating elements. At this time, the heating value of the PTC heater itself can be adjusted downward.

[0065] It should be noted that the above fault adjustment strategy is only for most PTC heater over-temperature faults and is not a fixed adjustment strategy. For example, if the second fault information appears frequently, it may be due to the failure of the heating element inside the PTC heater. The fault judgment mode is mainly used to clarify the direction of fault adjustment. The specific fault adjustment methods can be adjusted adaptively according to the actual situation.

[0066] In summary, in hybrid electric vehicles that utilize engine waste heat, by adding preconditions, the inlet (outlet) water temperature overheating faults when the PTC heater is working and when it is not working can be distinguished. Two separate fault records are formed by the first fault information and the second fault information. This not only allows for timely recording of the faults in the engine waste heat mode (i.e., when the PTC heater is not working), but also records the frequency of occurrence of the water temperature overheating fault, which is convenient for subsequent strategy adjustments to the vehicle.

[0067] It should be noted that in both the internal and external over-temperature judgment modes, the corresponding fault information will only be generated after the first temperature value (second temperature value) is greater than the second preset threshold (third preset threshold) for a certain period of time. This design is to avoid false alarms, and the fault signal will only be reported after it has stabilized.

[0068] Specifically, the steps to obtain the operating status of the PTC heater also include:

[0069] Step 1: Receive the start signal from the vehicle control terminal and wait for a second preset time to obtain the operating status of the PTC heater's temperature sensor. First, receive the start signal from the vehicle control terminal, that is, turn the ignition switch to the ON position and then wait for the second preset time, which is 2 seconds.

[0070] Step 2: Based on the operating status of the temperature sensor, determine whether to acquire the operating status of the PTC heater. Specifically, when the ignition switch is in the ON position and after waiting for 2 seconds, if the temperature sensor displays a fault after powering on, then step S100: Acquire the operating status of the PTC heater is unnecessary; the entire vehicle needs to be powered off to repair the temperature sensor. If the temperature sensor does not display a fault after powering on, then step S100: Acquire the operating status of the PTC heater should be performed. Here, the fault detection of the temperature sensor is a routine test; for example, checking whether its on / off current is within the standard range upon system power-on is sufficient.

[0071] The main purpose of steps one and two is to ensure that if the temperature sensor of the PTC heater malfunctions after ignition, there will be problems with the subsequent over-temperature judgment. Therefore, it is necessary to ensure that the temperature sensor is working properly before proceeding with the judgment. In the subsequent judgment logic, it is also necessary to avoid false alarms.

[0072] Example 2

[0073] like Figure 2 As shown, a high-pressure water-heating PTC heater over-temperature fault detection device based on Embodiment 1 includes:

[0074] The PTC heater operating condition acquisition module is configured to acquire the operating condition status of the PTC heater. The operating condition status includes: a first state or a second state; the first state represents that the PTC heater has received an enable signal and the duty cycle value of the PTC heater is greater than or equal to a first preset threshold; the second state represents that the PTC heater has not received an enable signal.

[0075] The fault strategy selection module is configured to query the fault strategy database based on the operating condition of the PTC heater and obtain the fault judgment mode corresponding to the operating condition of the PTC heater. The fault strategy database includes: the first state and the internal over-temperature judgment mode corresponding to the first state, the second state and the external over-temperature judgment mode corresponding to the second state, and the third state and the external over-temperature judgment mode corresponding to the third state.

[0076] The fault judgment execution module is configured to execute the steps of the fault judgment mode to determine whether the PTC heater has an over-temperature fault.

[0077] In addition, the above-mentioned high-pressure water-heating PTC heater over-temperature fault detection device also includes: a temperature sensor operating condition judgment module; the fault judgment execution module includes a duty cycle judgment unit and a temperature judgment unit.

[0078] Furthermore, the PTC heater operating condition acquisition module is specifically used to determine whether the PTC heater has received an enable signal from its control terminal. If it has received an enable signal, combined with the conclusion of the duty cycle judgment unit, it can be confirmed that the PTC heater is in the first state or the third state. If it has not received an enable signal, it is confirmed that the PTC heater is in the second state.

[0079] The fault strategy selection module is specifically used to select the fault judgment mode based on the judgment result of the PTC heater operating condition acquisition module. If the PTC heater is in the second state, that is, the PTC heater is in the non-working state, the external over-temperature judgment mode can be directly selected. If the PTC heater is in the third state, the external over-temperature judgment mode is also selected. Finally, if the PTC heater is in the first state, the internal over-temperature judgment mode is selected.

[0080] The temperature sensor condition judgment module is specifically used to obtain the condition status of the PTC heater's temperature sensor after the vehicle receives the start signal, and to determine whether the PTC heater's temperature sensor can work normally. The step of obtaining the PTC heater's condition status is only performed when the temperature sensor is fault-free; otherwise, the temperature sensor is inspected.

[0081] The duty cycle determination unit is specifically used to determine whether the duty cycle of the PTC heater is less than the first preset threshold after the PTC heater receives the enable signal. If the duty cycle is less than the first preset threshold, the operating condition of the PTC heater is confirmed to be the third state; otherwise, the operating condition of the PTC heater is confirmed to be the first state.

[0082] The temperature judgment unit is specifically used to determine whether the first temperature value is greater than the second preset threshold. When it is greater than the second preset threshold, the unit will report the first fault information, which is used to indicate that the PTC heater is in an external over-temperature state. In addition, it is also used to determine whether the second temperature value is greater than the third preset threshold. When it is greater than the third preset threshold, the unit will report the second fault information, which is used to indicate that the PTC heater is in an internal over-temperature state.

[0083] Example 3

[0084] A server includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of a method for judging over-temperature faults in a high-pressure water-heated PTC heater as described in Embodiment 1.

[0085] In this embodiment, as Figure 3 As shown, the computer system includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) 502 or programs loaded from storage into random access memory (RAM) 503. RAM 503 also stores various programs and data required for system operation. The CPU 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0086] The following components are connected to I / O interface 505: an input section 506 including a keyboard, mouse, etc.; an output section including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN card, modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive is also connected to I / O interface 505 as needed. A removable medium 511, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 510 as needed so that computer programs read from it can be installed into storage section 508 as needed.

[0087] In particular, according to embodiments of the present invention, the above-described reference process Figure 1The described process can be implemented as a computer software program. For example, Embodiment 3 of the present invention includes a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication component, and / or installed from a removable medium. When the computer program is executed by the central processing unit (CPU) 501, it performs the functions defined in the system of this application.

[0088] It should be noted that the computer-readable medium shown in this invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0089] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0090] The units described in the embodiments of the present invention can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself. The described units or modules can also be located in a processor; for example, a processor can be described as including a first generation module, an acquisition module, a search module, a second generation module, and a merging module. The names of these units or modules do not necessarily limit the specific unit or module itself; for example, the acquisition module can also be described as "an acquisition module for acquiring multiple instances to be probed in the base table".

[0091] In another aspect, this application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The computer-readable medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to implement the over-temperature fault judgment method for a high-pressure water-heating PTC heater as described in the above embodiments.

[0092] The units described in the embodiments of the present invention can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself. The described units or modules can also be located in a processor; for example, a processor can be described as including a first generation module, an acquisition module, a search module, a second generation module, and a merging module. The names of these units or modules do not necessarily limit the specific unit or module itself; for example, the acquisition module can also be described as "an acquisition module for acquiring multiple instances to be probed in the base table".

[0093] In another aspect, this application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The computer-readable medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to implement the over-temperature fault judgment method for a high-pressure water-heating PTC heater as described in the above embodiments.

[0094] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A method for judging over-temperature faults in a high-pressure water-heating PTC heater, characterized in that, Includes the following steps: The operating status of the PTC heater is obtained, including either a first state or a second state. The first state represents that the PTC heater has received an enable signal and the duty cycle value of the PTC heater is greater than or equal to a first preset threshold. The second state represents that the PTC heater has not received an enable signal. Based on the operating condition of the PTC heater, the fault strategy database is queried to obtain the fault judgment mode corresponding to the operating condition of the PTC heater; the fault strategy database includes at least: a first state and an internal over-temperature judgment mode corresponding to the first state; a second state and an external over-temperature judgment mode corresponding to the second state. The steps of the fault judgment mode are executed to determine whether the PTC heater has an over-temperature fault. The fault judgment mode is used to guide the vehicle to select a fault adjustment strategy. The fault adjustment strategy includes: reducing the utilization rate of the vehicle's external heat source corresponding to the external over-temperature judgment mode, and reducing the internal heating value of the PTC heater corresponding to the internal over-temperature judgment mode.

2. The method for judging over-temperature faults in a high-pressure water-heating PTC heater according to claim 1, characterized in that, The operating conditions also include a third state, which represents that the PTC heater receives an enable signal and the duty cycle value of the PTC heater is less than a first preset threshold. The fault strategy database also includes: a third state and an external over-temperature judgment mode corresponding to the third state.

3. A method for judging over-temperature faults in a high-pressure water-heating PTC heater according to claim 1 or 2, characterized in that, The steps of the external over-temperature judgment mode corresponding to the second state and the external over-temperature judgment mode corresponding to the third state both include: Obtain the first temperature value at the inlet or outlet of the PTC heater; Based on the first temperature value, determine whether the PTC heater is in an external overheating state.

4. The method for judging over-temperature faults in a high-pressure water-heating PTC heater according to claim 3, characterized in that, The step of determining whether the PTC heater is in an external overheating state based on the first temperature value includes: When the first temperature value is determined to be greater than the second preset threshold and continues for a first preset duration, a first fault message is generated. The first fault message is used to indicate that the PTC heater is in an external over-temperature state.

5. The method for judging over-temperature faults in a high-pressure water-heating PTC heater according to claim 4, characterized in that, The steps of the internal over-temperature judgment mode corresponding to the first state include: Obtain the second temperature value of the PTC heater inlet or outlet; When the second temperature value is determined to be greater than the third preset threshold and continues for a first preset duration, a second fault message is generated. The second fault message is used to indicate that the PTC heater is in an internal over-temperature state. The third preset threshold is less than the second preset threshold.

6. The method for judging over-temperature faults in a high-pressure water-heating PTC heater according to claim 1, characterized in that, The step of obtaining the operating status of the PTC heater also includes: Receive the start signal sent by the vehicle control terminal, and after a second preset duration, obtain the operating status of the temperature sensor of the PTC heater; Based on the operating status of the temperature sensor, determine whether to acquire the operating status of the PTC heater.

7. A device for judging over-temperature faults in a high-pressure water-heating PTC heater, characterized in that, include: The PTC heater operating condition acquisition module is configured to acquire the operating condition status of the PTC heater. The operating condition status includes either a first state or a second state. The first state represents that the PTC heater has received an enable signal and the duty cycle value of the PTC heater is greater than or equal to a first preset threshold. The second state represents that the PTC heater has not received an enable signal. The fault strategy selection module is configured to query the fault strategy database based on the operating condition of the PTC heater and obtain the fault judgment mode corresponding to the operating condition of the PTC heater; the fault strategy database includes: a first state and an internal over-temperature judgment mode corresponding to the first state; a second state and an external over-temperature judgment mode corresponding to the second state. A fault judgment execution module is configured to execute the steps of the fault judgment mode to determine whether the PTC heater has an over-temperature fault. The fault diagnosis mode is used to guide the vehicle to select a fault adjustment strategy. The fault adjustment strategy includes: reducing the utilization rate of the vehicle's external heat source corresponding to the external over-temperature diagnosis mode, and reducing the internal heating value of the PTC heater corresponding to the internal over-temperature diagnosis mode.

8. A server, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method for judging over-temperature faults of a high-pressure water-heating PTC heater as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for judging over-temperature faults of a high-pressure water-heating PTC heater as described in any one of claims 1 to 6.

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