Output temperature control method and device of PTC heater

Abstract

The invention discloses an output temperature control method and device of a PTC heater. The method comprises the following steps: calculating a first temperature difference value between a current first output temperature of the PTC heater and a preset target temperature; determining an updated output temperature according to the first temperature difference value and a preset temperature adjustment strategy; if the updated output temperature is smaller than the first preset threshold value, the PTC heater is controlled to stop heating, and the current second output temperature is obtained; if the current second output temperature is larger than a second preset threshold value, a second temperature difference value between the current second output temperature and the preset target temperature is calculated, the first temperature difference value is updated based on the second temperature difference value, and the step of determining the updated output temperature according to the first temperature difference value and the preset temperature adjusting strategy is executed again; therefore, the accurate control of the output temperature of the PTC heater is realized, and the comfort level of a driver and passengers is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to an output temperature control method and device of a PTC heater. Background Art

[0002] With the rapid development of new energy vehicles, most automotive air-conditioning systems use PTC heaters for temperature control. Among them, the PTC (Positive Temperature Coefficient) heater is a heating element with a positive temperature coefficient. Its resistance value increases with the increase of temperature, thereby automatically limiting the current and power output to avoid overheating.

[0003] However, in actual applications, due to factors such as ambient temperature and load changes, the output temperature of the PTC heater is often difficult to maintain constant, resulting in the PTC heater being unable to reach the preset target temperature in time, thereby affecting the comfort of the driver and passengers. Summary of the invention

[0004] The embodiments of the present invention provide a method and device for controlling the output temperature of a PTC heater, aiming to solve the problem in the prior art that the output temperature of the PTC heater cannot be accurately controlled.

[0005] In a first aspect, an embodiment of the present invention provides a method for controlling an output temperature of a PTC heater, the method comprising: Using a temperature sensor to obtain a current first output temperature of the PTC heater, and receiving a preset target temperature sent by the vehicle-mounted system, and calculating the current first output temperature and the preset target temperature to obtain a first temperature difference; Determine an updated output temperature according to the first temperature difference and a preset temperature adjustment strategy; If the updated output temperature is less than the first preset threshold, the PTC heater is controlled to stop heating, and the temperature sensor is used to obtain the current second output temperature; If the current second output temperature is greater than the second preset threshold, the current second output temperature and the preset target temperature are calculated to obtain a second temperature difference, the first temperature difference is updated based on the second temperature difference, and the step of determining the updated output temperature based on the first temperature difference and the preset temperature adjustment strategy is returned to execute until the updated output temperature reaches the preset target temperature.

[0006] In a second aspect, an embodiment of the present invention provides an output temperature control device for a PTC heater, the device comprising: A first acquisition unit, configured to acquire a current first output temperature of the PTC heater using a temperature sensor, receive a preset target temperature sent by a vehicle-mounted system, and calculate the current first output temperature and the preset target temperature to obtain a first temperature difference; a determining unit, configured to determine an updated output temperature according to the first temperature difference and a preset temperature adjustment strategy; A second acquisition unit, configured to control the PTC heater to stop heating if the updated output temperature is less than a first preset threshold, and to acquire a current second output temperature using the temperature sensor; An updating unit is used to calculate the current second output temperature and the preset target temperature to obtain a second temperature difference if the current second output temperature is greater than a second preset threshold value, update the first temperature difference based on the second temperature difference, and return to execute the step of determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy until the updated output temperature reaches the preset target temperature.

[0007] An embodiment of the present invention provides an output temperature control method and device for a PTC heater, which calculates a first temperature difference between a current first output temperature of the PTC heater and a preset target temperature; determines an updated output temperature according to the first temperature difference and a preset temperature adjustment strategy; if the updated output temperature is less than a first preset threshold, controls the PTC heater to stop heating and obtains a current second output temperature; if the current second output temperature is greater than a second preset threshold, calculates a second temperature difference between the current second output temperature and the preset target temperature, updates the first temperature difference based on the second temperature difference, and returns to execute the step of determining an updated output temperature according to the first temperature difference and the preset temperature adjustment strategy until the updated output temperature reaches the preset target temperature, so as to achieve precise control of the output temperature of the PTC heater and improve the comfort of the driver and passengers. 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 method for controlling the output temperature of a PTC heater provided in an embodiment of the present invention; Figure 2 A schematic block diagram of a PTC heater output temperature control device provided by an embodiment of the present invention; Figure 3A schematic block diagram of a computer device 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] In order to more clearly understand the technical solution of the present application, the terminals involved are described in detail below. The present application describes the technical solution from the perspectives of the sending end and the server.

[0015] See also Figure 1 , Figure 1 The present invention provides a flow chart of a method for controlling the output temperature of a PTC heater provided in an embodiment of the present invention. The method for controlling the output temperature of a PTC heater is applied to a controller of a PTC heater.

[0016] like Figure 1 As shown, the method includes steps S110 to S140.

[0017] S110, using a temperature sensor to obtain a current first output temperature of the PTC heater, and receiving a preset target temperature sent by the vehicle-mounted system, and calculating the current first output temperature and the preset target temperature to obtain a first temperature difference.

[0018] In this embodiment, in order to achieve precise control and regulation of the output temperature of the PTC heater, this embodiment first collects the current first output temperature of the PTC heater in real time by using a high-precision temperature sensor to ensure that the current first output temperature of the PTC heater can be obtained in real time; and, in real time, receives the target temperature sent by the vehicle-mounted system, compares the current first output temperature with the preset target temperature, and calculates the first temperature difference between the two, so as to perform subsequent corresponding operations through the first temperature difference, thereby continuously narrowing the gap between the current first output temperature and the preset target temperature, and finally achieving precise control of the output temperature. Among them, the preset target temperature is a target temperature value set according to actual application requirements.

[0019] S120. Determine an updated output temperature according to the first temperature difference and a preset temperature adjustment strategy.

[0020] In this embodiment, after the first temperature difference is calculated, the duty cycle corresponding to the first temperature difference is determined from the preset temperature adjustment strategy through the first temperature difference, so as to control the output power of the PTC heater by adjusting the duty cycle (wherein the duty cycle refers to the proportion of the power-on time (i.e., the high-level time) to the total time in a pulse cycle), thereby indirectly achieving precise control of the output temperature of the PTC heater; wherein the preset temperature adjustment strategy can be obtained by continuous adjustment and optimization through experiments or simulations; thereby achieving preliminary control of the PTC heater by adjusting the duty cycle.

[0021] In one embodiment, the step S120 includes: determining a target duty cycle adjustment amount corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy; The current output temperature is adjusted according to the target duty cycle adjustment amount to obtain the updated output temperature.

[0022] In this embodiment, after obtaining the first temperature difference, the most suitable duty cycle adjustment amount can be determined in the preset temperature adjustment strategy as the target duty cycle adjustment amount according to the first temperature difference. Once the target duty cycle adjustment amount is determined, the power-on time of the PTC heater can be adjusted based on the target duty cycle adjustment amount, thereby adjusting its output power. In addition, since there is a direct relationship between the output temperature of the PTC heater and its output power, by adjusting its output power, the current output temperature can be accurately controlled, and the updated output temperature can be obtained. Therefore, the above embodiment adjusts the output power of the PTC heater by controlling its duty cycle, thereby achieving fine control of the current output temperature.

[0023] In one embodiment, determining a target duty cycle adjustment amount corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy includes: Determine a temperature interval corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy, and use the temperature interval corresponding to the first temperature difference as a target temperature interval; A corresponding duty cycle adjustment amount is acquired according to the target temperature range as the target duty cycle adjustment amount.

[0024] In this embodiment, in order to accurately match the target duty cycle adjustment amount corresponding to the first temperature difference, the temperature interval corresponding to the first temperature difference is first determined through the first temperature difference and the preset temperature adjustment strategy, and the temperature interval corresponding to the first temperature difference is used as the target temperature interval; in addition, once the target temperature interval is determined, the corresponding duty cycle adjustment amount can be obtained from this target temperature interval as the target duty cycle adjustment amount, so that the target duty cycle adjustment amount can be used to adjust the output power of the PTC heater based on the target duty cycle adjustment amount, thereby reducing the difference between the current output temperature and the preset target temperature.

[0025] In one embodiment, adjusting the current output temperature according to the target duty cycle adjustment amount to obtain the updated output temperature includes: Obtaining the current duty cycle, and calculating the target duty cycle adjustment amount and the current duty cycle to obtain an adjusted duty cycle; adjusting the output power of the PTC heater based on the adjusted duty cycle to obtain an updated output power; The updated output temperature is determined according to the updated output power.

[0026] In this embodiment, in order to obtain the updated output temperature, firstly, the current duty cycle of the PTC heater is obtained, and the current duty cycle is the actual working state of the PTC heater in the current control cycle; then, the adjusted duty cycle is calculated according to the target duty cycle adjustment amount and the current duty cycle; wherein, the adjusted duty cycle = the current duty cycle ± the target duty cycle adjustment amount. In addition, the output power of the PTC heater is adjusted based on the adjusted duty cycle to control the working voltage and / or working current of the PTC heater to obtain the updated output power; further, after the output power is adjusted, the updated output temperature can also be determined by the updated output power, and the updated output temperature is used as the feedback signal in the next round of control cycle to adjust the duty cycle and output power, thereby continuously adjusting to achieve precise control of the output temperature of the PTC heater.

[0027] In one embodiment, before step S120, the method further includes: Acquire historical temperature difference data within a preset time period and a historical duty cycle adjustment amount corresponding to each historical temperature difference in the historical temperature difference data from a preset database; The historical temperature difference data and the historical duty cycle adjustment amount corresponding to each historical temperature difference are analyzed to obtain the preset temperature adjustment strategy.

[0028] In this embodiment, before determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy, in order to determine the preset temperature adjustment strategy, the historical temperature difference data within the preset time period and the historical duty cycle adjustment amount corresponding to each historical temperature difference in the historical temperature difference data are obtained from the preset database; and after obtaining each historical temperature difference and each historical duty cycle adjustment amount, a data integrity check is performed to ensure that each historical temperature difference has a corresponding historical duty cycle adjustment amount without missing or abnormal. In addition, data cleaning can be performed on each historical temperature difference and each historical duty cycle adjustment amount, which helps to improve the accuracy and reliability of subsequent analysis. In addition, statistical analysis is performed on each historical temperature difference and the historical duty cycle adjustment amount corresponding to each historical temperature difference to identify the potential relationship between the historical temperature difference data and the historical duty cycle adjustment amount, thereby generating a preset temperature adjustment strategy, and storing the preset temperature adjustment strategy in the preset database. Therefore, the above embodiment analyzes the historical temperature difference data and the historical duty cycle adjustment amount within the preset time period to determine a more accurate preset temperature adjustment strategy, so that the duty cycle can be adjusted more accurately according to the temperature difference to achieve the desired target preset temperature.

[0029] In one embodiment, after step S120, the method further includes: If the updated output temperature is greater than or equal to the first preset threshold, the updated output temperature and the preset target temperature are calculated to obtain a third temperature difference, the first temperature difference is updated based on the third temperature difference, and the step of determining the updated output temperature based on the first temperature difference and the preset temperature adjustment strategy is returned to execute.

[0030] In this embodiment, when the updated output temperature is greater than or equal to the first preset threshold value, it indicates that the updated output temperature is at or close to the preset target temperature. At this time, by calculating the third temperature difference between the updated output temperature and the preset target temperature, and returning to execute the step of determining the updated output temperature based on the first temperature difference and the preset temperature adjustment strategy, the updated output temperature can be fine-tuned to make it closer to the preset target temperature, thereby ensuring the accuracy and stability of the output temperature control of the PTC heater.

[0031] S130: If the updated output temperature is less than a first preset threshold, the PTC heater is controlled to stop heating, and the temperature sensor is used to obtain a current second output temperature.

[0032] In this embodiment, after the updated output temperature is determined according to the first temperature difference and the preset temperature adjustment strategy, when the updated output temperature is less than the first preset threshold, it means that the current output power is too high or the external conditions such as the ambient temperature cause insufficient heating effect, so the PTC heater needs to stop heating to prevent the output temperature from continuing to drop. At this time, a control instruction is sent to the PTC heater to stop heating immediately. In addition, after the PTC heater is controlled to stop heating, the temperature sensor can be used to continue to monitor the current second output temperature of the PTC heater to learn the actual temperature of the PTC heater after the heating is stopped.

[0033] S140. If the current second output temperature is greater than the second preset threshold, the current second output temperature and the preset target temperature are calculated to obtain a second temperature difference, the first temperature difference is updated based on the second temperature difference, and the step of determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy is returned to execute until the updated output temperature reaches the preset target temperature.

[0034] In this embodiment, in order to determine whether the current second output temperature of the PTC heater is still too high after stopping heating and whether it needs to be further adjusted, after obtaining the current second output temperature, the current second output temperature is further confirmed. If the current second output temperature after the PTC heater stops heating is greater than the second preset threshold, the second temperature difference between the current second output temperature and the preset target temperature is calculated again, and the first temperature difference is updated based on the second temperature difference; then, the step of determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy is re-executed, and the temperature deviation is gradually reduced through continuous feedback and adjustment, so that the output temperature is closer to the preset target temperature until the preset target temperature is reached. On the contrary, if the current second output temperature after the PTC heater stops heating is less than or equal to the second preset threshold, the current second output temperature is too low at this time, and restarting the PTC heater to heat may cause instability or failure, so it is necessary to return to the step of controlling the PTC heater to stop heating to ensure the safety of the PTC heater; wherein, the first preset threshold is less than the second preset threshold.

[0035] In one embodiment, the method further comprises: When a new temperature interval is detected, a first duty cycle adjustment amount corresponding to the new temperature interval is obtained, and the first duty cycle adjustment amount is used as the new duty cycle adjustment amount; The newly added temperature range and the newly added duty cycle adjustment amount are updated to the preset temperature adjustment strategy to obtain an updated temperature adjustment strategy.

[0036] In this embodiment, after a new temperature interval is detected, the first duty cycle adjustment amount corresponding to the new temperature interval can be determined through experiments or simulations, and the first duty cycle adjustment amount is used as the new duty cycle adjustment amount; in addition, the new temperature interval and the new duty cycle adjustment amount are integrated with the preset temperature adjustment strategy to obtain an updated temperature adjustment strategy, so that the situation of the new temperature interval is updated to the preset temperature adjustment strategy in a timely manner to ensure the accuracy of the output temperature control of the PTC heater. It can be seen from the above technical scheme that the present invention calculates the first temperature difference between the current first output temperature of the PTC heater and the preset target temperature; determines the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy; if the updated output temperature is less than the first preset threshold, controls the PTC heater to stop heating and obtains the current second output temperature; if the current second output temperature is greater than the second preset threshold, calculates the second temperature difference between the current second output temperature and the preset target temperature, updates the first temperature difference based on the second temperature difference, and returns to execute the step of determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy until the updated output temperature reaches the preset target temperature, so as to achieve precise control of the output temperature of the PTC heater and improve the comfort of the driver and passengers.

[0037] Figure 2 Schematic block diagram of a PTC heater output temperature control device provided by an embodiment of the present invention. Figure 2 As shown, the present invention further provides a PTC heater output temperature control device. The PTC heater output temperature control device 100 includes a first acquisition unit 110 , a determination unit 120 , a second acquisition unit 130 and an update unit 140 .

[0038] The first acquisition unit 110 is used to acquire the current first output temperature of the PTC heater using a temperature sensor, receive a preset target temperature sent by the vehicle system, and calculate the current first output temperature and the preset target temperature to obtain a first temperature difference.

[0039] In this embodiment, in order to achieve precise control and adjustment of the output temperature of the PTC heater, this embodiment first collects the current first output temperature of the PTC heater in real time by using a high-precision temperature sensor to ensure that the current first output temperature of the PTC heater can be obtained in real time; and, receives the preset target temperature sent by the vehicle system in real time, compares the current first output temperature with the preset target temperature, and calculates the first temperature difference between the two, so as to perform subsequent corresponding operations through the first temperature difference, thereby continuously narrowing the gap between the current first output temperature and the preset target temperature, and finally achieving precise control of the output temperature. Among them, the preset target temperature is a target temperature value set according to actual application requirements.

[0040] The determination unit 120 is configured to determine an updated output temperature according to the first temperature difference and a preset temperature adjustment strategy.

[0041] In this embodiment, after the first temperature difference is calculated, the duty cycle corresponding to the first temperature difference is determined from the preset temperature adjustment strategy through the first temperature difference, so as to control the output power of the PTC heater by adjusting the duty cycle (wherein the duty cycle refers to the proportion of the power-on time (i.e., the high-level time) to the total time in a pulse cycle), thereby indirectly achieving precise control of the output temperature of the PTC heater; wherein the preset temperature adjustment strategy can be obtained by continuous adjustment and optimization through experiments or simulations; thereby achieving preliminary control of the PTC heater by adjusting the duty cycle.

[0042] In one embodiment, the determining unit 120 is specifically configured to: determining a target duty cycle adjustment amount corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy; The current output temperature is adjusted according to the target duty cycle adjustment amount to obtain the updated output temperature.

[0043] In this embodiment, after obtaining the first temperature difference, the most suitable duty cycle adjustment amount can be determined in the preset temperature adjustment strategy as the target duty cycle adjustment amount according to the first temperature difference. Once the target duty cycle adjustment amount is determined, the power-on time of the PTC heater can be adjusted based on the target duty cycle adjustment amount, thereby adjusting its output power. In addition, since there is a direct relationship between the output temperature of the PTC heater and its output power, by adjusting its output power, the current output temperature can be accurately controlled, and the updated output temperature can be obtained. Therefore, the above embodiment adjusts the output power of the PTC heater by controlling its duty cycle, thereby achieving fine control of the current output temperature.

[0044] In one embodiment, determining a target duty cycle adjustment amount corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy includes: Determine a temperature interval corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy, and use the temperature interval corresponding to the first temperature difference as a target temperature interval; A corresponding duty cycle adjustment amount is acquired according to the target temperature range as the target duty cycle adjustment amount.

[0045] In this embodiment, in order to accurately match the target duty cycle adjustment amount corresponding to the first temperature difference, the temperature interval corresponding to the first temperature difference is first determined through the first temperature difference and the preset temperature adjustment strategy, and the temperature interval corresponding to the first temperature difference is used as the target temperature interval; in addition, once the target temperature interval is determined, the corresponding duty cycle adjustment amount can be obtained from this target temperature interval as the target duty cycle adjustment amount, so that the target duty cycle adjustment amount can be used to adjust the output power of the PTC heater based on the target duty cycle adjustment amount, thereby reducing the difference between the current output temperature and the preset target temperature.

[0046] In one embodiment, adjusting the current output temperature according to the target duty cycle adjustment amount to obtain the updated output temperature includes: Obtaining the current duty cycle, and calculating the target duty cycle adjustment amount and the current duty cycle to obtain an adjusted duty cycle; adjusting the output power of the PTC heater based on the adjusted duty cycle to obtain an updated output power; The updated output temperature is determined according to the updated output power.

[0047] In this embodiment, in order to obtain the updated output temperature, firstly, the current duty cycle of the PTC heater is obtained, and the current duty cycle is the actual working state of the PTC heater in the current control cycle; then, the adjusted duty cycle is calculated according to the target duty cycle adjustment amount and the current duty cycle; wherein, the adjusted duty cycle = the current duty cycle ± the target duty cycle adjustment amount. In addition, the output power of the PTC heater is adjusted based on the adjusted duty cycle to control the working voltage and / or working current of the PTC heater to obtain the updated output power; further, after the output power is adjusted, the updated output temperature can also be determined by the updated output power, and the updated output temperature is used as the feedback signal in the next round of control cycle to adjust the duty cycle and output power, thereby continuously adjusting to achieve precise control of the output temperature of the PTC heater.

[0048] In one embodiment, before the determining unit 120, the unit is further configured to: Acquire historical temperature difference data within a preset time period and a historical duty cycle adjustment amount corresponding to each historical temperature difference in the historical temperature difference data from a preset database; The historical temperature difference data and the historical duty cycle adjustment amount corresponding to each historical temperature difference are analyzed to obtain the preset temperature adjustment strategy.

[0049] In this embodiment, before determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy, in order to establish the preset temperature adjustment strategy, the historical temperature difference data within the preset time period and the historical duty cycle adjustment amount corresponding to each historical temperature difference in the historical temperature difference data are obtained from the preset database; and after obtaining each historical temperature difference and each historical duty cycle adjustment amount, a data integrity check is performed to ensure that each historical temperature difference has a corresponding historical duty cycle adjustment amount without missing or abnormal. In addition, data cleaning can be performed on each historical temperature difference and each historical duty cycle adjustment amount, which helps to improve the accuracy and reliability of subsequent analysis. In addition, statistical analysis is performed on each historical temperature difference and the historical duty cycle adjustment amount corresponding to each historical temperature difference to identify the potential relationship between the historical temperature difference data and the historical duty cycle adjustment amount, thereby generating a preset temperature adjustment strategy, and storing the preset temperature adjustment strategy in the preset database. Therefore, the above embodiment analyzes the historical temperature difference data and the historical duty cycle adjustment amount within the preset time period to establish a more accurate preset temperature adjustment strategy, so that the duty cycle can be adjusted more accurately according to the temperature difference to achieve the desired target preset temperature.

[0050] In one embodiment, after the determining unit 120, it is further configured to: If the updated output temperature is greater than or equal to the first preset threshold, the updated output temperature and the preset target temperature are calculated to obtain a third temperature difference, the first temperature difference is updated based on the third temperature difference, and the step of determining the updated output temperature based on the first temperature difference and the preset temperature adjustment strategy is returned to execute.

[0051] In this embodiment, when the updated output temperature is greater than or equal to the first preset threshold value, it indicates that the updated output temperature is at or close to the preset target temperature. At this time, by calculating the third temperature difference between the updated output temperature and the preset target temperature, and returning to execute the step of determining the updated output temperature based on the first temperature difference and the preset temperature adjustment strategy, the updated output temperature can be fine-tuned to make it closer to the preset target temperature, thereby ensuring the accuracy and stability of the output temperature control of the PTC heater.

[0052] The second acquisition unit 130 is configured to control the PTC heater to stop heating if the updated output temperature is less than a first preset threshold, and to acquire a current second output temperature using the temperature sensor.

[0053] In this embodiment, after the updated output temperature is determined according to the first temperature difference and the preset temperature adjustment strategy, when the updated output temperature is less than the first preset threshold, it means that the current output power is too high or the external conditions such as the ambient temperature cause insufficient heating effect, so the PTC heater needs to stop heating to prevent the output temperature from continuing to drop. At this time, a control instruction is sent to the PTC heater to stop heating immediately. In addition, after the PTC heater is controlled to stop heating, the temperature sensor can be used to continue to monitor the current second output temperature of the PTC heater to learn the actual temperature of the PTC heater after the heating is stopped.

[0054] The updating unit 140 is used to calculate the current second output temperature and the preset target temperature to obtain a second temperature difference if the current second output temperature is greater than a second preset threshold value, update the first temperature difference based on the second temperature difference, and return to execute the step of determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy until the updated output temperature reaches the preset target temperature.

[0055] In this embodiment, in order to determine whether the current second output temperature of the PTC heater is still too high after stopping heating and whether it needs to be further adjusted, after obtaining the current second output temperature, the current second output temperature is further confirmed. If the current second output temperature after the PTC heater stops heating is greater than the second preset threshold, the second temperature difference between the current second output temperature and the preset target temperature is calculated again, and the first temperature difference is updated based on the second temperature difference; then, the step of determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy is re-executed, and the temperature deviation is gradually reduced through continuous feedback and adjustment, so that the output temperature is closer to the preset target temperature until the preset target temperature is reached. On the contrary, if the current second output temperature after the PTC heater stops heating is less than or equal to the second preset threshold, the current second output temperature is too low at this time, and restarting the PTC heater to heat may cause instability or failure, so it is necessary to return to the step of controlling the PTC heater to stop heating to ensure the safety of the PTC heater; wherein, the first preset threshold is less than the second preset threshold.

[0056] In one embodiment, the device is further used for: When a new temperature interval is detected, a first duty cycle adjustment amount corresponding to the new temperature interval is obtained, and the first duty cycle adjustment amount is used as the new duty cycle adjustment amount; The newly added temperature range and the newly added duty cycle adjustment amount are updated to the preset temperature adjustment strategy to obtain an updated temperature adjustment strategy.

[0057] In this embodiment, after a new temperature interval is detected, the first duty cycle adjustment amount corresponding to the new temperature interval can be determined through experiments or simulations, and the first duty cycle adjustment amount is used as the new duty cycle adjustment amount; in addition, the new temperature interval and the new duty cycle adjustment amount are integrated with the preset temperature adjustment strategy to obtain an updated temperature adjustment strategy. Thus, the situation of the new temperature interval is updated to the preset temperature adjustment strategy in a timely manner to ensure the accuracy of the output temperature control of the PTC heater. It can be seen from the above technical scheme that the present invention calculates the first temperature difference between the current first output temperature of the PTC heater and the preset target temperature; determines the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy; if the updated output temperature is less than the first preset threshold, controls the PTC heater to stop heating and obtains the current second output temperature; if the current second output temperature is greater than the second preset threshold, calculates the second temperature difference between the current second output temperature and the preset target temperature, updates the first temperature difference based on the second temperature difference, and returns to execute the step of determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy until the updated output temperature reaches the preset target temperature, so as to achieve precise control of the output temperature of the PTC heater and improve the comfort of the driver and passengers.

[0058] The above-mentioned PTC heater output temperature control device can be implemented in the form of a computer program, which can be used in Figure 3 Runs on the computer device shown.

[0059] See also Figure 3 , Figure 3 500 is a schematic block diagram of a computer device provided in an embodiment of the present invention. The computer device 500 is a server, which may be an independent server or a server cluster composed of multiple servers. The computer device 500 may also be a sending end, which may be an electronic device with communication functions such as a smart phone, a tablet computer, a laptop computer, a desktop computer, a personal digital assistant, and a wearable device.

[0060] See also Figure 3 The computer device 500 includes a processor 502 , a memory and a network interface 505 connected via a system bus 501 , wherein the memory may include a storage medium 503 and an internal memory 504 .

[0061] The storage medium 503 may store an operating system 5031 and a computer program 5032. When the computer program 5032 is executed, the processor 502 may execute a method for controlling the output temperature of a PTC heater.

[0062] The processor 502 is used to provide computing and control capabilities to support the operation of the entire computer device 500 .

[0063] The internal memory 504 provides an environment for the operation of the computer program 5032 in the storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can execute the PTC heater output temperature control method.

[0064] The network interface 505 is used for network communication, such as providing data information transmission, etc. Those skilled in the art will understand that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device 500 to which the solution of the present invention is applied. The specific computer device 500 may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0065] The processor 502 is used to run a computer program 5032 stored in the memory to implement the PTC heater output temperature control method disclosed in the embodiment of the present invention.

[0066] Those skilled in the art will understand that Figure 3 The embodiments of the computer device shown in the figure do not constitute a limitation on the specific composition of the computer device. In other embodiments, the computer device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently. For example, in some embodiments, the computer device may only include a memory and a processor. In such embodiments, the structure and function of the memory and the processor are the same as those of the embodiment of the present invention. Figure 3 The embodiments shown are consistent and will not be described again here.

[0067] It should be understood that in the embodiment of the present invention, the processor 502 may be a central processing unit (CPU), and the processor 502 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0068] In another embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium may be a non-volatile computer-readable storage medium. The computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, the PTC heater output temperature control method disclosed in the embodiment of the present invention is implemented.

[0069] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the above-described equipment, system and unit can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. Those of ordinary skill in the art can appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0070] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, systems and methods can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. Units with the same function may also be combined into one unit. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, systems or units, or may be electrical, mechanical or other forms of connection.

[0071] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0072] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0073] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), disk or optical disk and other media that can store program code.

[0074] 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 method for controlling the output temperature of a PTC heater, characterized in that: The method comprises: Using a temperature sensor to obtain a current first output temperature of the PTC heater, and receiving a preset target temperature sent by the vehicle-mounted system, and calculating the current first output temperature and the preset target temperature to obtain a first temperature difference; Determine an updated output temperature according to the first temperature difference and a preset temperature adjustment strategy; If the updated output temperature is less than the first preset threshold, the PTC heater is controlled to stop heating, and the temperature sensor is used to obtain the current second output temperature; If the current second output temperature is greater than the second preset threshold, the current second output temperature and the preset target temperature are calculated to obtain a second temperature difference, the first temperature difference is updated based on the second temperature difference, and the step of determining the updated output temperature based on the first temperature difference and the preset temperature adjustment strategy is returned to execute until the updated output temperature reaches the preset target temperature.

2. The output temperature control method of the PTC heater according to claim 1, characterized in that: The step of determining the updated output temperature according to the first temperature difference and a preset temperature adjustment strategy includes: determining a target duty cycle adjustment amount corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy; The current output temperature is adjusted according to the target duty cycle adjustment amount to obtain the updated output temperature.

3. The output temperature control method of the PTC heater according to claim 2, characterized in that: The determining a target duty cycle adjustment amount corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy includes: Determine a temperature interval corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy, and use the temperature interval corresponding to the first temperature difference as a target temperature interval; A corresponding duty cycle adjustment amount is acquired according to the target temperature range as the target duty cycle adjustment amount.

4. The output temperature control method of the PTC heater according to claim 2, characterized in that: The step of adjusting the current output temperature according to the target duty cycle adjustment amount to obtain the updated output temperature includes: Obtaining the current duty cycle, and calculating the target duty cycle adjustment amount and the current duty cycle to obtain an adjusted duty cycle; adjusting the output power of the PTC heater based on the adjusted duty cycle to obtain an updated output power; The updated output temperature is determined according to the updated output power.

5. The output temperature control method of a PTC heater according to claim 1, characterized in that: Before determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy, the method further includes: Acquire historical temperature difference data within a preset time period and a historical duty cycle adjustment amount corresponding to each historical temperature difference in the historical temperature difference data from a preset database; The historical temperature difference data and the historical duty cycle adjustment amount corresponding to each historical temperature difference are analyzed to obtain the preset temperature adjustment strategy.

6. The output temperature control method of a PTC heater according to claim 1, characterized in that: After determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy, the method further includes: If the updated output temperature is greater than or equal to the first preset threshold, the updated output temperature and the preset target temperature are calculated to obtain a third temperature difference, the first temperature difference is updated based on the third temperature difference, and the step of determining the updated output temperature based on the first temperature difference and the preset temperature adjustment strategy is returned to execute.

7. The output temperature control method of a PTC heater according to claim 1, characterized in that: The method further comprises: When a new temperature interval is detected, a first duty cycle adjustment amount corresponding to the new temperature interval is obtained, and the first duty cycle adjustment amount is used as the new duty cycle adjustment amount; The newly added temperature range and the newly added duty cycle adjustment amount are updated to the preset temperature adjustment strategy to obtain an updated temperature adjustment strategy.

8. An output temperature control device for a PTC heater, characterized in that: The device comprises: A first acquisition unit, configured to acquire a current first output temperature of the PTC heater using a temperature sensor, receive a preset target temperature sent by a vehicle-mounted system, and calculate the current first output temperature and the preset target temperature to obtain a first temperature difference; a determining unit, configured to determine an updated output temperature according to the first temperature difference and a preset temperature adjustment strategy; A second acquisition unit, configured to control the PTC heater to stop heating if the updated output temperature is less than a first preset threshold, and to acquire a current second output temperature using the temperature sensor; An updating unit is used to calculate the current second output temperature and the preset target temperature to obtain a second temperature difference if the current second output temperature is greater than a second preset threshold value, update the first temperature difference based on the second temperature difference, and return to execute the step of determining the updated output temperature according to the first temperature difference and the preset temperature adjustment strategy until the updated output temperature reaches the preset target temperature.

9. The output temperature control device of the PTC heater according to claim 8, characterized in that: The step of determining the updated output temperature according to the first temperature difference and a preset temperature adjustment strategy includes: determining a target duty cycle adjustment amount corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy; The current output temperature is adjusted according to the target duty cycle adjustment amount to obtain the updated output temperature.

10. The output temperature control device of the PTC heater according to claim 9, characterized in that: The determining a target duty cycle adjustment amount corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy includes: Determine a temperature interval corresponding to the first temperature difference according to the first temperature difference and the preset temperature adjustment strategy, and use the temperature interval corresponding to the first temperature difference as a target temperature interval; A corresponding duty cycle adjustment amount is acquired according to the target temperature range as the target duty cycle adjustment amount.

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