Power closed-loop integral control method and device of PTC (Positive Temperature Coefficient) heater

Abstract

The invention discloses a power closed-loop integral control method and device for a PTC heater, and the method comprises the steps: carrying out the continuous sampling of working parameters of the PTC heater according to a preset sampling period, and obtaining a working parameter value of each sampling period; calculating the working parameter value of each sampling period according to a preset integral control algorithm to obtain an accumulated power value; if it is detected that the accumulated power value reaches a preset target power value, a first control instruction is output to the IGBT module so as to control the IGBT module to be disconnected, then heating of the PTC heater is stopped, and therefore accurate control over the output power under the low switching frequency is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of PTC (Positive Temperature Coefficient) heaters, and in particular to a power closed-loop integral control method and device for a PTC heater. Background Art

[0002] With the rapid development of new energy vehicles, more and more car air conditioners are using PTC heaters to meet heating needs; specifically, by judging the size of the heating demand, the power required by the PTC heater is determined to meet the user's heating needs. Therefore, PTC heater power control is a crucial link.

[0003] However, it is relatively easy for traditional power control methods to achieve power closed-loop control at high switching frequencies, but at low switching frequencies (such as 0.1HZ), power closed-loop control becomes particularly difficult and often cannot provide sufficient response speed and accuracy, resulting in inaccurate power closed-loop control and poor results. Summary of the invention

[0004] The embodiment of the present invention provides a closed-loop integral power control method and device for a PTC heater, aiming to solve the problems of inaccurate power control and poor control effect at low switching frequency in the prior art.

[0005] In a first aspect, an embodiment of the present invention provides a power closed-loop integral control method for a PTC heater, which is applied to a control unit of a PTC heater, wherein the control unit is electrically connected to an IGBT module, and the method comprises: Continuously sampling the working parameters of the PTC heater according to a preset sampling period to obtain the working parameter value of each sampling period; The working parameter value of each sampling period is calculated according to a preset integral control algorithm to obtain an accumulated power value; If it is detected that the accumulated power value reaches a preset target power value, a first control instruction is output to the IGBT module to control the IGBT module to disconnect.

[0006] In a second aspect, an embodiment of the present invention provides a power closed-loop integral control device for a PTC heater, which operates in a PTC heater, wherein the PTC heater is electrically connected to an IGBT module, and the device comprises: The sampling unit is used to continuously sample the working parameters of the PTC heater according to a preset sampling period to obtain the working parameter value of each sampling period; A calculation unit, used to calculate the working parameter value of each sampling period according to a preset integral control algorithm to obtain an accumulated power value; The control unit is used for outputting a first control instruction to the IGBT module to control the IGBT module to disconnect if it is detected that the accumulated power value reaches a preset target power value.

[0007] An embodiment of the present invention provides a power closed-loop integral control method and device for a PTC heater. The method continuously samples the working parameters of the PTC heater according to a preset sampling period to obtain the working parameter value of each sampling period; calculates the working parameter value of each sampling period according to a preset integral control algorithm to obtain an accumulated power value; if it is detected that the accumulated power value reaches a preset target power value, outputs a first control instruction to the IGBT module to control the IGBT module to disconnect, thereby stopping heating the PTC heater, thereby achieving precise control of the output power at a low switching frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0009] Figure 1 A schematic flow chart of a power closed-loop integral control method for a PTC heater provided in an embodiment of the present invention; Figure 2 A schematic block diagram of a power closed-loop integral control device for a PTC heater provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0011] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0012] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0013] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0014] See also Figure 1 , Figure 1 A schematic flow chart of a power closed-loop integral control method for a PTC heater provided by an embodiment of the present invention. The power closed-loop integral control method for a PTC heater is applied to a control unit of a PTC heater, and the control unit is electrically connected to an IGBT module.

[0015] like Figure 1 As shown, the method includes steps S110 to S130.

[0016] S110 , continuously sampling the working parameters of the PTC heater according to a preset sampling period to obtain the working parameter value of each sampling period.

[0017] In this embodiment, since the PTC heater is composed of thermistors with positive temperature coefficients, when the temperature rises within a certain specific range, their resistance will increase sharply and nonlinearly with the increase in temperature. This special physical property causes the current of the PTC heater to change with the change in resistance value, and the heating power will also change with the change in heating time during operation. Therefore, during the operation of the PTC heater, in order to accurately capture this change, it is necessary to set a shorter preset sampling period to obtain as many working parameter values ​​as possible, thereby more accurately describing the working state of the PTC heater, which helps to improve control accuracy.

[0018] Among them, the preset sampling period in this embodiment is preferably 10 ms, which means that 100 consecutive samples can be taken within 1 second; in addition, the user can also set the preset sampling period according to actual needs, which is not specifically limited here.

[0019] In one embodiment, the operating parameters of the PTC heater are continuously sampled according to a preset sampling period to obtain the operating parameter value of each sampling period, including: Continuously sampling the working parameters of the PTC heater according to the preset sampling period to obtain a first sampling value of each sampling period; The first sampling value of each sampling period is filtered according to a preset filtering algorithm to obtain the working parameter value of each sampling period.

[0020] In this embodiment, in order to further improve the accuracy of the working parameter value, the working parameters of the PTC heater are first connected and sampled according to the preset sampling period to obtain the first sampling value corresponding to each sampling period; and the first sampling value of each sampling period is filtered according to the preset filtering algorithm, so that after filtering, a smoothed working parameter value of each sampling period is obtained. Among them, the preset filtering algorithm includes algorithms such as mean filtering, median filtering, Kalman filtering and wavelet transform; users can set it according to actual noise characteristics. Therefore, this embodiment removes noise and interference in the first sampling value of each sampling period through filtering, thereby obtaining a more accurate working parameter value.

[0021] In one embodiment, before obtaining the working parameter value of each sampling period, the method further includes: In response to a start-up instruction, performing a fault self-check according to the start-up instruction to obtain a self-check result; If the self-test result is that there is no fault, then continue to perform the step of periodically sampling the working parameters of the PTC heater according to the preset sampling time to obtain the working parameter value of each sampling period; If the self-check result is that a fault exists, a fault alarm prompt information is generated and the fault alarm prompt information is sent to the terminal device.

[0022] In this embodiment, when the control unit of the PTC heater receives a startup instruction from the host computer, it responds to the startup instruction and starts a preset fault self-checking program according to the startup instruction to check whether each component is in a normal working state, thereby obtaining a self-checking result; if the self-checking result is that there is no fault, indicating that the PTC heater can work normally, the startup instruction causes the PTC heater to enter a normal working mode and continue to execute the next step (i.e., periodically sampling the working parameters of the PTC heater according to the preset sampling time to obtain the working parameter value of each sampling period). If the self-checking result is that there is a fault, a fault alarm prompt information is generated, and the fault alarm prompt information is sent to the terminal device, so that the fault alarm prompt information is displayed through the terminal device to prompt the relevant user to troubleshoot and repair the fault, thereby effectively avoiding safety accidents caused by the fault.

[0023] In one embodiment, after obtaining the working parameter value of each sampling period, the method further includes: Compare the working parameter value of each sampling period with the preset parameter value to obtain a comparison result; If the comparison result is that the working parameter value is greater than the preset parameter value, an abnormal prompt message is generated.

[0024] In this embodiment, after obtaining the working parameter value of each sampling period, the working parameter value of each sampling period is also compared with the preset parameter value to confirm whether the PTC heater is in a normal working state; wherein, if the comparison result is that the working parameter value is less than the preset parameter value, the next step is executed (i.e., the working parameter value of each sampling period is calculated according to the preset integral control algorithm to obtain the accumulated power value); if the comparison result is that the working parameter value is greater than the preset parameter value, an abnormality detection is performed based on the preset detection strategy to obtain a detection result, thereby effectively identifying possible abnormal situations; and an abnormal prompt information is generated according to the detection result to prompt relevant personnel to take corresponding protective measures.

[0025] S120 , calculating the working parameter value of each sampling period according to a preset integral control algorithm to obtain an accumulated power value.

[0026] In this embodiment, in order to achieve precise power control, the working parameter value of each sampling period is accurately calculated by utilizing the characteristics of the preset integral control algorithm to obtain the accumulated power value, so as to continuously adjust the output power to eliminate the deviation between the accumulated power value and the preset target power value, thereby achieving precise power control.

[0027] In one embodiment, the working parameter value of each sampling period includes a sampled current value and a sampled voltage value; the working parameter sampled value of each sampling period is calculated according to a preset integral control algorithm to obtain an accumulated power value, including: Calculate the sampled current value and sampled voltage value in each sampling period to obtain each instantaneous power value; Each instantaneous power value is accumulated and calculated to obtain the accumulated power value.

[0028] In this embodiment, in order to calculate the accumulated power value, the instantaneous power value of each sampling period is firstly obtained by calculating the sampled current value and the sampled voltage value in each sampling period; specifically, the instantaneous power value of each sampling period can be calculated by the following formula: P k =U k ·I k ; in, U k Indicates k The sampled voltage value of a sampling cycle, Ik Indicates k The sampling current value of a sampling cycle; P k Indicates k The instantaneous power value of a sampling period, k Is a positive integer.

[0029] Furthermore, the instantaneous power value of each sampling period is added to obtain the accumulated power value; this process can be expressed as: ; in, P K Indicates k The instantaneous power value of a sampling period, k is a positive integer, N is [1, k].

[0030] In one embodiment, after obtaining the accumulated power value, the method further includes: If it is detected that the accumulated power value is lower than the preset target power value, a second control instruction is output to the IGBT module to control the IGBT module to continue to maintain a closed state.

[0031] In this embodiment, after the accumulated power value is obtained, the accumulated power value is compared with the preset target power value. When it is detected that the accumulated power value is lower than the preset target power value, it means that the current output power is insufficient. At this time, the output needs to be increased to meet the heating demand. Then, a second control instruction is generated and output to the IGBT module to control the IGBT module to continue to maintain or enhance the closed state of the IGBT module, thereby allowing more current to pass through, so as to increase the power output of the system and thereby increase the output heat generation.

[0032] S130: If it is detected that the accumulated power value reaches a preset target power value, a first control instruction is output to the IGBT module to control the IGBT module to disconnect.

[0033] In this embodiment, after the accumulated power value is obtained, the accumulated power value is compared with the preset target power value. When it is detected that the accumulated power value reaches the preset target power value, it means that the current output power has met the preset target power value or exceeded the preset target power value. At this time, in order to avoid the IGBT module from being overheated and damaged due to long-term high-power operation, a first control instruction is generated and output to the IGBT module, so that the IGBT module is disconnected through the first control instruction, thereby cutting off the power output, and then stopping heating the PTC heater, so as to effectively prevent the IGBT module from being damaged due to overpower, while protecting the safe operation of the entire device.

[0034] In one embodiment, after outputting the first control instruction to the IGBT module, the method further includes: Collecting the transient current of the PTC heater in real time according to a preset monitoring strategy; If the transient current is detected to be greater than a preset current threshold, an abnormal alarm message is generated; If it is monitored that the transient current is less than the preset current threshold, the step of collecting the transient current of the PTC heater in real time according to the preset monitoring strategy is continued.

[0035] In this embodiment, after the control unit of the PTC controller outputs the first control instruction, the preset monitoring strategy is immediately started, and the transient current of the PTC heater is collected in real time according to the preset monitoring strategy, and the transient current is compared with the preset current threshold to obtain a comparison result; wherein, the preset current threshold can be set according to factors such as the rated power, working environment and safety standards of the PTC heater. When the monitored comparison result is that the transient current is greater than the preset current threshold, an abnormal alarm message is generated to prompt the relevant operator to conduct an investigation; when the monitored comparison result is that the transient current is less than the preset current threshold, it indicates that the PTC heater is in a normal working state, and the step of collecting the transient current of the PTC heater in real time according to the preset monitoring strategy is continued until a new control instruction or other abnormal situation is received. Thus, the working state of the PTC heater is monitored in real time to ensure its safe operation.

[0036] It can be seen from the above technical scheme that the present invention obtains the working parameter value of each sampling period by continuously sampling the working parameters of the PTC heater according to a preset sampling period; calculates the working parameter value of each sampling period according to a preset integral control algorithm to obtain an accumulated power value; if it is detected that the accumulated power value reaches the preset target power value, outputs a first control instruction to the IGBT module to control the IGBT module to disconnect, and then stop heating the PTC heater, thereby realizing precise control of the output power at a low switching frequency.

[0037] Figure 2 A schematic block diagram of a power closed-loop integral control device for a PTC heater provided in an embodiment of the present invention. Figure 2 As shown, the present invention also provides a power closed-loop integral control device 100 for a PTC heater, wherein the power closed-loop integral control device 100 for the PTC heater operates in a PTC heater, and the PTC heater is electrically connected to an IGBT module; and the power closed-loop integral control device 100 for the PTC heater includes a sampling unit 110, a calculation unit 120 and a control unit 130.

[0038] The sampling unit 110 is used to continuously sample the working parameters of the PTC heater according to a preset sampling period to obtain the working parameter value of each sampling period.

[0039] In this embodiment, since the PTC heater is composed of thermistors with positive temperature coefficients, when the temperature rises within a certain specific range, their resistance will increase sharply and nonlinearly with the increase in temperature. This special physical property causes the current of the PTC heater to change with the change in resistance value, and the heating power will also change with the change in heating time during operation. Therefore, during the operation of the PTC heater, in order to accurately capture this change, it is necessary to set a shorter preset sampling period to obtain as many working parameter values ​​as possible, thereby more accurately describing the working state of the PTC heater, which helps to improve control accuracy.

[0040] Among them, the preset sampling period in this embodiment is preferably 10 ms, which means that 100 consecutive samples can be taken within 1 second; in addition, the user can also set the preset sampling period according to actual needs, which is not specifically limited here.

[0041] In one embodiment, the sampling unit 110 is specifically used for: Continuously sampling the working parameters of the PTC heater according to the preset sampling period to obtain a first sampling value of each sampling period; The first sampling value of each sampling period is filtered according to a preset filtering algorithm to obtain the working parameter value of each sampling period.

[0042] In this embodiment, in order to further improve the accuracy of the working parameter value, the working parameters of the PTC heater are first connected and sampled according to the preset sampling period to obtain the first sampling value corresponding to each sampling period; and the first sampling value of each sampling period is filtered according to the preset filtering algorithm, so that after filtering, a smoothed working parameter value of each sampling period is obtained. Among them, the preset filtering algorithm includes algorithms such as mean filtering, median filtering, Kalman filtering and wavelet transform; users can set it according to actual noise characteristics. Therefore, this embodiment removes noise and interference in the first sampling value of each sampling period through filtering, thereby obtaining a more accurate working parameter value.

[0043] In one embodiment, before obtaining the working parameter value of each sampling period, the method further includes: In response to a start-up instruction, performing a fault self-check according to the start-up instruction to obtain a self-check result; If the self-test result is that there is no fault, then continue to perform the step of periodically sampling the working parameters of the PTC heater according to the preset sampling time to obtain the working parameter value of each sampling period; If the self-check result is that a fault exists, a fault alarm prompt information is generated and the fault alarm prompt information is sent to the terminal device.

[0044] In this embodiment, when the control unit of the PTC heater receives a startup instruction from the host computer, it responds to the startup instruction and starts a preset fault self-checking program according to the startup instruction to check whether each component is in a normal working state, thereby obtaining a self-checking result; if the self-checking result is that there is no fault, indicating that the PTC heater can work normally, the startup instruction causes the PTC heater to enter a normal working mode and continue to execute the next step (i.e., periodically sampling the working parameters of the PTC heater according to the preset sampling time to obtain the working parameter value of each sampling period). If the self-checking result is that there is a fault, a fault alarm prompt information is generated, and the fault alarm prompt information is sent to the terminal device, so that the fault alarm prompt information is displayed through the terminal device to prompt the relevant user to troubleshoot and repair the fault, thereby effectively avoiding safety accidents caused by the fault.

[0045] In one embodiment, after obtaining the working parameter value of each sampling period, the method further includes: Compare the working parameter value of each sampling period with the preset parameter value to obtain a comparison result; If the comparison result is that the working parameter value is greater than the preset parameter value, an abnormal prompt message is generated.

[0046] In this embodiment, after obtaining the working parameter value of each sampling period, the working parameter value of each sampling period is also compared with the preset parameter value to confirm whether the PTC heater is in a normal working state; wherein, if the comparison result is that the working parameter value is less than the preset parameter value, the next step is executed (i.e., the working parameter value of each sampling period is calculated according to the preset integral control algorithm to obtain the accumulated power value); if the comparison result is that the working parameter value is greater than the preset parameter value, an abnormality detection is performed based on the preset detection strategy to obtain a detection result, thereby effectively identifying possible abnormal situations; and an abnormal prompt information is generated according to the detection result to prompt relevant personnel to take corresponding protective measures.

[0047] The calculation unit 120 is used to calculate the working parameter value of each sampling period according to a preset integral control algorithm to obtain an accumulated power value.

[0048] In this embodiment, in order to achieve precise power control, the working parameter value of each sampling period is accurately calculated by utilizing the characteristics of the preset integral control algorithm to obtain the accumulated power value, so as to continuously adjust the output power to eliminate the deviation between the accumulated power value and the preset target power value, thereby achieving precise power control.

[0049] In one embodiment, the working parameter value of each sampling period includes a sampled current value and a sampled voltage value; the calculation unit 120 is specifically used to: Calculate the sampled current value and sampled voltage value in each sampling period to obtain each instantaneous power value; Each instantaneous power value is accumulated and calculated to obtain the accumulated power value.

[0050] In this embodiment, in order to calculate the accumulated power value, the instantaneous power value of each sampling period is firstly obtained by calculating the sampled current value and the sampled voltage value in each sampling period; specifically, the instantaneous power value of each sampling period can be calculated by the following formula: P k =U k ·I k ; in, U k Indicates k The sampled voltage value of a sampling cycle, I k Indicates k The sampling current value of a sampling cycle; P k Indicates k The instantaneous power value of a sampling period, k Is a positive integer.

[0051] Furthermore, the instantaneous power value of each sampling period is added to obtain the accumulated power value; this process can be expressed as: ; in, P K Indicates k The instantaneous power value of a sampling period, k is a positive integer, N is [1, k].

[0052] In one embodiment, after obtaining the accumulated power value, the method further includes: If it is detected that the accumulated power value is lower than the preset target power value, a second control instruction is output to the IGBT module to control the IGBT module to continue to maintain a closed state.

[0053] In this embodiment, after the accumulated power value is obtained, the accumulated power value is compared with the preset target power value. When it is detected that the accumulated power value is lower than the preset target power value, it means that the current output power is insufficient. At this time, the output needs to be increased to meet the heating demand. Then, a second control instruction is generated and output to the IGBT module to control the IGBT module to continue to maintain or enhance the closed state of the IGBT module, thereby allowing more current to pass through, so as to increase the power output of the system and thereby increase the output heat generation.

[0054] The control unit 130 is configured to output a first control instruction to the IGBT module to control the IGBT module to disconnect if it is detected that the accumulated power value reaches a preset target power value.

[0055] In this embodiment, after the accumulated power value is obtained, the accumulated power value is compared with the preset target power value. When it is detected that the accumulated power value reaches the preset target power value, it means that the current output power has met the preset target power value or exceeded the preset target power value. At this time, in order to avoid the IGBT module from being overheated and damaged due to long-term high-power operation, a first control instruction is generated and output to the IGBT module, so that the IGBT module is disconnected through the first control instruction, thereby cutting off the power output, and then stopping heating the PTC heater, so as to effectively prevent the IGBT module from being damaged due to overpower, while protecting the safe operation of the entire device.

[0056] In one embodiment, after outputting the first control instruction to the IGBT module, the method further includes: Collecting the transient current of the PTC heater in real time according to a preset monitoring strategy; If the transient current is detected to be greater than a preset current threshold, an abnormal alarm message is generated; If it is monitored that the transient current is less than the preset current threshold, the step of collecting the transient current of the PTC heater in real time according to the preset monitoring strategy is continued.

[0057] In this embodiment, after the control unit of the PTC controller outputs the first control instruction, the preset monitoring strategy is immediately started, and the transient current of the PTC heater is collected in real time according to the preset monitoring strategy, and the transient current is compared with the preset current threshold to obtain a comparison result; wherein, the preset current threshold can be set according to factors such as the rated power, working environment and safety standards of the PTC heater. When the monitored comparison result is that the transient current is greater than the preset current threshold, an abnormal alarm message is generated to prompt the relevant operator to conduct an investigation; when the monitored comparison result is that the transient current is less than the preset current threshold, it indicates that the PTC heater is in a normal working state, and the step of collecting the transient current of the PTC heater in real time according to the preset monitoring strategy is continued until a new control instruction or other abnormal situation is received. Thus, the working state of the PTC heater is monitored in real time to ensure its safe operation.

[0058] It can be seen from the above technical scheme that the present invention obtains the working parameter value of each sampling period by continuously sampling the working parameters of the PTC heater according to a preset sampling period; calculates the working parameter value of each sampling period according to a preset integral control algorithm to obtain an accumulated power value; if it is detected that the accumulated power value reaches the preset target power value, outputs a first control instruction to the IGBT module to control the IGBT module to disconnect, and then stop heating the PTC heater, thereby realizing precise control of the output power at a low switching frequency.

[0059] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A power closed-loop integral control method for a PTC heater, applied to a control unit of a PTC heater, wherein the control unit is electrically connected to an IGBT module, and characterized in that: The method comprises: Continuously sampling the working parameters of the PTC heater according to a preset sampling period to obtain the working parameter value of each sampling period; The working parameter value of each sampling period is calculated according to a preset integral control algorithm to obtain an accumulated power value; If it is detected that the accumulated power value reaches a preset target power value, a first control instruction is output to the IGBT module to control the IGBT module to disconnect.

2. The power closed-loop integral control method of the PTC heater according to claim 1, characterized in that: The working parameter values ​​of each sampling period include a sampling current value and a sampling voltage value; The method of calculating the working parameter sampling value of each sampling period according to the preset integral control algorithm to obtain the accumulated power value includes: Calculate the sampled current value and sampled voltage value in each sampling period to obtain each instantaneous power value; Each instantaneous power value is accumulated and calculated to obtain the accumulated power value.

3. The power closed-loop integral control method of the PTC heater according to claim 1, characterized in that: The operating parameters of the PTC heater are continuously sampled according to a preset sampling period to obtain the operating parameter value of each sampling period, including: Continuously sampling the working parameters of the PTC heater according to the preset sampling period to obtain a first sampling value of each sampling period; The first sampling value of each sampling period is filtered according to a preset filtering algorithm to obtain the working parameter value of each sampling period.

4. The power closed-loop integral control method of the PTC heater according to claim 3, characterized in that: Before obtaining the working parameter value of each sampling period, the method further includes: In response to a start-up instruction, performing a fault self-check according to the start-up instruction to obtain a self-check result; If the self-test result is that there is no fault, then continue to perform the step of periodically sampling the working parameters of the PTC heater according to the preset sampling time to obtain the working parameter value of each sampling period; If the self-check result is that a fault exists, a fault alarm prompt information is generated and the fault alarm prompt information is sent to the terminal device.

5. The power closed-loop integral control method of a PTC heater according to claim 1, characterized in that: After outputting the first control instruction to the IGBT module, the method further includes: Collecting the transient current of the PTC heater in real time according to a preset monitoring strategy; If the transient current is detected to be greater than a preset current threshold, an abnormal alarm message is generated; If it is monitored that the transient current is less than the preset current threshold, the step of collecting the transient current of the PTC heater in real time according to the preset monitoring strategy is continued.

6. The power closed-loop integral control method of a PTC heater according to claim 3, characterized in that: After obtaining the working parameter value of each sampling period, the method further includes: Compare the working parameter value of each sampling period with the preset parameter value to obtain a comparison result; If the comparison result is that the working parameter value is greater than the preset parameter value, an abnormal prompt message is generated.

7. The power closed-loop integral control method of a PTC heater according to claim 1, characterized in that: After obtaining the accumulated power value, the method further includes: If it is detected that the accumulated power value is lower than the preset target power value, a second control instruction is output to the IGBT module to control the IGBT module to continue to maintain a closed state.

8. A power closed-loop integral control device for a PTC heater, operating in a PTC heater, wherein the PTC heater is electrically connected to an IGBT module, and characterized in that: The device comprises: The sampling unit is used to continuously sample the working parameters of the PTC heater according to a preset sampling period to obtain the working parameter value of each sampling period; A calculation unit, used to calculate the working parameter value of each sampling period according to a preset integral control algorithm to obtain an accumulated power value; The control unit is used for outputting a first control instruction to the IGBT module to control the IGBT module to disconnect if it is detected that the accumulated power value reaches a preset target power value.

9. The power closed-loop integral control device for a PTC heater according to claim 8, characterized in that: The working parameter values ​​of each sampling period include a sampling current value and a sampling voltage value; The computing unit is specifically used for: Calculate the sampled current value and sampled voltage value in each sampling period to obtain each instantaneous power value; Each instantaneous power value is accumulated and calculated to obtain the accumulated power value.

10. The power closed-loop integral control device for a PTC heater according to claim 8, characterized in that: The sampling unit is specifically used for: Continuously sampling the working parameters of the PTC heater according to the preset sampling period to obtain a first sampling value of each sampling period; The first sampling value of each sampling period is filtered according to a preset filtering algorithm to obtain the working parameter value of each sampling period.

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