PTC heater control method and device, automobile and storage medium

Abstract

The invention relates to a PTC heater control method and device, an automobile and a storage medium. Wherein the PTC heater comprises a plurality of heating cores, and the plurality of heating cores are respectively arranged on different control branches. On the basis of the control method, the control method comprises the steps that a heating starting signal is responded, and different control branches are conducted in turn, so that the multiple heating cores work in turn. According to the PTC heater, the structure of the PTC heater is optimized, the multiple heating cores are arranged on the different control branches respectively, the optimized control strategy is combined, power is supplied to the heating cores in the PTC heater in turn, it is guaranteed that only one heating core works at the same time, abnormal sounds generated by the PTC heater can be reduced, and the service life of the PTC heater is prolonged. In addition, the current passing through the PTC heater can be stably changed, and the ripple current generated in the circuit is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning control, and in particular to a control method, device, automobile and storage medium for a PTC heater. Background Art

[0002] New energy vehicles need to use PTC (Positive Temperature Coefficient) heaters to heat the passenger compartment. PTC heaters are usually composed of multiple PTC ceramic plates connected in parallel as heating cores, and the duty cycle of the PWM signal can be adjusted through PWM (Pulse width modulation) technology to control the heating power of the PTC heater.

[0003] During the initial heating stage of the PTC heater, the PTC ceramic sheet will undergo mechanical deformation under the action of the electric field, thereby producing abnormal noise.

[0004] In addition, since the temperature of the PTC ceramic sheet itself is low and the resistance value is small, when the PTC ceramic sheet is working, its resistance will increase with the increase of temperature. This characteristic makes the current of the PTC heater larger when it starts, and then the current gradually decreases with the increase of temperature. This fast-changing current may generate ripple current in the circuit, which in turn generates noise and affects the performance of the car. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a control method, device, vehicle and storage medium for a PTC heater capable of reducing abnormal noise and ripple current of a vehicle.

[0006] In a first aspect, the present application provides a control method for a PTC heater, wherein the PTC heater comprises a plurality of heating cores, and the plurality of heating cores are respectively arranged on different control branches;

[0007] The control method comprises:

[0008] In response to the heating start signal, different control branches are turned on in turn so that the multiple heating cores work in turn.

[0009] In one embodiment, after the step of conducting different control branches in turn, the method further includes:

[0010] Get the air outlet temperature and target air outlet temperature of the air conditioning equipment;

[0011] Determining a duty cycle of a PWM signal according to the air outlet temperature and the target air outlet temperature;

[0012] The PWM signal is generated according to the duty cycle and input into the PTC heater, so that the PWM signal is input into the target heating core, the target heating core is the heating core on the control branch in the on state, and the PWM signal is used to control the heating power of the target heating core.

[0013] In one embodiment, after the step of generating the PWM signal according to the duty cycle and inputting the PWM signal into the PTC heater, the method further includes:

[0014] Monitoring the core temperature and heating power of the target heating core, as well as the air outlet temperature and target air outlet temperature of the air conditioning equipment;

[0015] The duty cycle is adjusted according to the core temperature, the heating power, the air outlet temperature and the target air outlet temperature.

[0016] In one embodiment, the step of adjusting the duty cycle comprises:

[0017] Determining whether the core temperature is greater than a preset temperature;

[0018] If so, determining a new duty cycle according to the temperature difference between the air outlet temperature and the target air outlet temperature;

[0019] If not, determining whether the heating power is greater than a preset limit power;

[0020] If the heating power is greater than the preset limit power, determining a new duty cycle according to the preset limit power;

[0021] If the heating power is less than or equal to the preset limit power, a new duty cycle is determined according to the temperature difference between the air outlet temperature and the target air outlet temperature.

[0022] In one embodiment, the step of adjusting the duty cycle comprises:

[0023] Determining whether the core temperature is greater than a preset temperature;

[0024] If so, determining a new duty cycle according to the temperature difference between the air outlet temperature and the target air outlet temperature;

[0025] If not, enter the power limit mode and start timing, and exit the power limit mode after the timing time is longer than the preset time;

[0026] In the power limiting mode, determining whether the heating power is greater than a preset limiting power;

[0027] If the heating power is greater than the preset limit power, determining a new duty cycle according to the preset limit power;

[0028] If the heating power is less than or equal to the preset limit power, a new duty cycle is determined according to the temperature difference between the air outlet temperature and the target air outlet temperature.

[0029] In one embodiment, each control branch is provided with an IGBT and the heating core in sequence;

[0030] The step of conducting different control branches in turn comprises:

[0031] The IGBTs are controlled to close in turn, so that the heating cores corresponding to the IGBTs work in turn.

[0032] In a second aspect, the present application provides a control device for a PTC heater, wherein the PTC heater comprises a plurality of heating cores, and the plurality of heating cores are respectively arranged on different control branches;

[0033] The control device comprises:

[0034] The heating control module is used to respond to the heating start signal and conduct different control branches in turn so that the multiple heating cores work in turn.

[0035] In a third aspect, the present application provides a car, comprising the control device described in the second aspect.

[0036] In a fourth aspect, the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method described in the first aspect are implemented.

[0037] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method described in the first aspect are implemented.

[0038] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present application.

[0039] The control method, device, vehicle and storage medium of the above-mentioned PTC heater can achieve the following beneficial effects: optimizing the structure of the PTC heater, respectively setting multiple heating cores on different control branches, and combining with the optimized control strategy to power the heating cores in the PTC heater in turn to ensure that only one heating core is working at the same time, thereby reducing the abnormal noise generated by the PTC heater, and by powering multiple heating cores in turn, the current passing through the PTC heater can change stably, thereby reducing the ripple current generated in the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1This is a first control timing diagram of the heating core in the embodiment of the present application;

[0041] Figure 2 This is a second control timing diagram of the heating core in the embodiment of the present application;

[0042] Figure 3 This is a schematic diagram of the first control process of the PTC heater in the embodiment of the present application;

[0043] Figure 4 This is a schematic diagram of a second control flow of a PTC heater in an embodiment of the present application;

[0044] Figure 5 Schematic diagram of the internal structure of a computer device in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] It should be noted that the diagrams provided in the present embodiment are only used to illustrate the basic concept of the present application in a schematic manner. The structures, proportions, sizes, etc. illustrated by the drawings of the present specification are only used to match the contents disclosed in the specification, so that people familiar with this technology can understand and read them, and are not used to limit the restrictive conditions that can be implemented in the present application, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that can be produced by the present application and the purposes that can be achieved, should still fall within the scope that the technical content disclosed in the present application can cover. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" quoted in the present specification are also only for the convenience of narration, rather than for limiting the scope that can be implemented in the present application. The change or adjustment of the relative relationship, without substantial changes in the technical content, should also be regarded as the scope that can be implemented in the present application.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the text does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] As shown in this document, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural, unless the context clearly indicates an exception. Generally speaking, the terms "include" and "comprise" only indicate that the steps and elements that have been clearly identified are included, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0049] The definitions of inclusion in this document, such as the terms "having", "may have", "including" or "may include" used herein, indicate the existence of the corresponding functions, operations, elements, etc. herein, and do not limit the existence of one or more other functions, operations, elements, etc. In addition, it should be understood that the terms "including" or "having" used herein indicate the existence of the features, numbers, steps, operations, elements, components, or a combination thereof described in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or a combination thereof.

[0050] In the embodiments of the present application, prefixes such as "first" and "second" are used only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present application does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "multiple" is two or more.

[0051] The present application optimizes the structure of the PTC heater, respectively sets multiple heating cores on different control branches, and combines with the optimized control strategy to power the heating cores in the PTC heater in turn, ensuring that only one heating core is working at the same time. This can not only reduce the abnormal noise generated by the simultaneous operation of multiple heating cores in the PTC heater, but also enable the current passing through the PTC heater to change stably, thereby reducing the ripple current generated in the circuit.

[0052] In one embodiment, the PTC heater includes three or more heating cores, and different heating cores are respectively arranged on different control branches. Based on the control method of the PTC heater provided in the present application, in response to the heating start signal, different control branches are turned on in turn so that each heating core works in turn.

[0053] Specifically, the PTC heater includes three or more control branches, each of which is provided with a heating core. In response to a heating start signal, the PTC heater is powered on, and each control branch is turned on in turn, so that each heating core works in turn.

[0054] Among them, for those with three or more heating cores:

[0055] You can follow a fixed order, such as Figure 1 As shown, each control branch is turned on in turn in each control cycle. For example, the PTC heater includes a first heating core, a second heating core and a third heating core, and the control branches corresponding to the first, second and third heating cores are turned on in turn each time, so that the three heating cores work in turn, and in each control cycle, the conduction time of each control branch accounts for 1 / 3.

[0056] Each control cycle includes a high-level clock signal and a low-level clock signal.

[0057] It is also possible to dynamically select the control branch corresponding to the heating core with the lowest core temperature to be turned on in each control cycle according to the core temperature of the heating core, so as to reduce the situation where the core temperature of the heating core is too high.

[0058] For example, a PTC heater includes three heating cores, A, B, and C. Each time, the core temperatures of the three heating cores are compared, and the control branch corresponding to the heating core with the lowest core temperature is selected for conduction. If there are heating cores with the same core temperature, the control branch corresponding to one of the heating cores can be selected for conduction, or the control branch with the longest time interval since the last conduction can be selected for conduction.

[0059] In this embodiment, in response to the heating start signal, different control branches are turned on in turn, so that multiple heating cores work in turn. It is ensured that only one heating core is working at the same time, which can not only reduce the abnormal sound generated by multiple heating cores working at the same time, but also make the current passing through the PTC heater change stably, reducing the ripple current generated in the circuit.

[0060] In another embodiment, the structure of the PTC heater is simplified so that it only includes two heating cores, and the two heating cores are respectively arranged on different control branches.

[0061] In this embodiment, only two heating cores are used, which can not only simplify the design and manufacturing process of the PTC heater, but also reduce the weight and cost of the entire PTC heater. Combined with the optimization strategy of the two heating cores working in turns, it can reduce the abnormal noise generated by the PTC heater and the ripple current generated in the circuit, thereby reducing the risk of failure and overheating and improving the safety of the PTC heater.

[0062] In one embodiment, after the step of conducting different control branches in turn, the method further includes:

[0063] Get the air outlet temperature and target air outlet temperature of the air conditioning equipment;

[0064] Determine the duty cycle of the PWM signal according to the air outlet temperature and the target air outlet temperature;

[0065] A PWM signal is generated according to the duty cycle and input into the PTC heater, so that the PWM signal is input into the target heating core, which is the heating core on the control branch in the on state, and the PWM signal is used to control the heating power of the target heating core.

[0066] Exemplarily, the air conditioning device includes the above-mentioned PTC heater, and the PTC heater includes a first control branch and a second control branch. The first control branch is provided with a first heating core, and the second control branch is provided with a second heating core.

[0067] The control method of the PTC heater can be applied to the controller of the PTC heater, and can also be applied to the controller of the air conditioning equipment including the PTC heater. After the PTC heater is powered on, the controller inputs a PWM signal to the target heating core in the PTC heater. Since the control branch is turned on in turn, it is equivalent to the PWM signal being input to the first heating core and the second heating core in turn to control the heating power of the two heating cores.

[0068] like Figure 2 As shown, after receiving the heating start signal, a voltage is input to the PTC heater to start the PTC heater. The working time of the two heating cores is controlled by the clock signal. In the first half control cycle of the first clock signal, the first control branch is turned on to supply power to the first heating core, so that the first heating core works in the first half control cycle of the clock signal, and the PWM signal is input to the first heating core; when entering the second half control cycle of the first clock signal, the first control branch is turned off and the second control branch is turned on to supply power to the second heating core, so that the second heating core works in the second half control cycle of the first clock signal, and the PWM signal is input to the second heating core; when entering the first half control cycle of the second clock signal, the second control branch is turned off and the first control branch is turned on again, and the PWM signal is input to the first heating core again.

[0069] According to the above process, different control branches are turned on in turn for multiple times, so that the first heating core and the second heating core work in the first half control cycle and the second half control cycle of the clock signal respectively, and switch quickly and work in turn in a short time, which can reduce the abnormal sound generated by the PTC heater and reduce the ripple current generated in the circuit.

[0070] A switch and a heating core may be arranged in sequence on each control branch. For example, an IGBT (Insulated Gate Bipolar Transistor) and a heating core may be arranged in sequence, and the heating cores corresponding to the IGBTs may work in turn by controlling the IGBTs to be closed in turn.

[0071] Furthermore, since the PTC heater usually requires a high heating power to quickly raise the temperature when it is started, this embodiment can avoid the situation where the two heating cores are working at the same time and the temperature rises too quickly, thereby more accurately controlling the actual air outlet temperature and making the actual air outlet temperature more stable.

[0072] Among them, according to the temperature difference between the air outlet temperature and the target air outlet temperature, a PWM signal can be output and the duty cycle of the PWM signal can be adjusted through PID (proportional-integral-differential) operation.

[0073] Proportional (P): According to the current deviation (the temperature difference between the target outlet temperature and the outlet temperature), the PWM duty cycle is adjusted proportionally. The larger the deviation, the greater the adjustment.

[0074] Integration (I): Accumulates all past deviations to eliminate long-term deviations and prevent steady-state errors in the system.

[0075] Differentiation (D): Predict the changing trend of the deviation, reduce the overshoot and oscillation of the system through the differential term, and improve the stability of the system.

[0076] Exemplarily, the air outlet temperature and the target air outlet temperature of the air conditioning device are first obtained, and the temperature difference between the air outlet temperature and the target air outlet temperature is calculated.

[0077] The proportional term is obtained by multiplying the temperature difference by the preset proportional gain. The proportional gain is an adjustable parameter that determines the initial response strength to temperature deviation. For different devices, it can be obtained through experimental calibration.

[0078] The temperature difference is integrated (accumulated) and multiplied by the preset integral gain to obtain the integral term. The integral term helps to eliminate the steady-state error so that the target outlet temperature can be achieved in the end.

[0079] The derivative term is calculated based on the rate of change of the temperature difference and multiplied by the preset derivative gain. The derivative term helps predict the future trend of the temperature deviation.

[0080] Finally, the proportional term, integral term and differential term are added together to obtain the output of the PID operation, and this output is converted into the duty cycle of the PWM signal according to the appropriate proportional coefficient.

[0081] In one embodiment, after the step of generating a PWM signal according to the duty cycle and inputting the PWM signal into the PTC heater, the method further includes:

[0082] Monitor the core temperature and heating power of the target heating core, as well as the air outlet temperature and target air outlet temperature of the air conditioning equipment;

[0083] The duty cycle is adjusted according to the core temperature, heating power, air outlet temperature and target air outlet temperature to adjust the heating power of the target heating core.

[0084] In this embodiment, by real-time monitoring of the core temperature of the target heating core, the air outlet temperature of the air-conditioning system and the target air outlet temperature, the duty cycle of the PWM signal is dynamically adjusted according to the core temperature of the target heating core, the air outlet temperature of the air-conditioning system and the target air outlet temperature. The heating power of the target heating core can be accurately controlled, and the temperature change can be quickly responded to. The heating power of the PTC heater can be adjusted according to actual needs to avoid unnecessary energy consumption.

[0085] For example, when the temperature difference between the outlet temperature and the target outlet temperature is large, the duty cycle can be increased, that is, the time that the PWM signal is at a high level can be increased, thereby increasing the heating power of the PTC heater. When the temperature difference is small, the duty cycle can be reduced, that is, the time that the PWM signal is at a high level can be reduced, thereby reducing the heating power of the PTC heater, which can not only reduce energy waste, but also reduce the number of starts and stops of the air conditioning system by maintaining temperature stability, which helps to extend the service life of the air conditioning equipment.

[0086] In one embodiment, see Figure 3 , the steps of periodically adjusting the duty cycle include:

[0087] Determine whether the core temperature is greater than the preset temperature;

[0088] If so, determine a new duty cycle based on the temperature difference between the air outlet temperature and the target air outlet temperature;

[0089] If not, determine whether the heating power is greater than the preset limit power;

[0090] If the heating power is greater than the preset limit power, a new duty cycle is determined according to the preset limit power;

[0091] If the heating power is less than or equal to the preset limit power, a new duty cycle is determined according to the temperature difference between the air outlet temperature and the target air outlet temperature.

[0092] Specifically, after receiving the heating start signal, the outlet temperature and target outlet temperature of the air conditioner are obtained first, and the duty cycle of the PWM signal is determined according to the outlet temperature and the target outlet temperature and input into the PTC heater. In the PTC heater, when the PWM signal is in a high level state, different control branches are turned on multiple times, so that the two heating cores work in turn.

[0093] Based on this, the core temperature and heating power of the target heating core, as well as the air outlet temperature and target air outlet temperature of the air-conditioning equipment are monitored in real time.

[0094] Exemplarily, during the real-time monitoring process, the duty cycle of the PWM signal is periodically adjusted to determine whether the core temperature is greater than a preset temperature, and if the core temperature is less than or equal to the preset temperature, enter the power limiting mode, and when the core temperature is greater than the preset temperature, exit the power limiting mode.

[0095] If the power limit mode is not entered, a new duty cycle is determined according to the temperature difference between the air outlet temperature and the target air outlet temperature. After entering the power limit mode, different strategies need to be selected to adjust the duty cycle of the PWM signal according to the size relationship between the heating power of the target heating core and the preset limit power.

[0096] In the power limiting mode, the heating power of the target heating core cannot exceed the preset limit power. This is because the heating core of the PTC heater has a low resistance at low temperatures. If a large current is applied at this time, the heating core will heat up rapidly and may exceed the safe operating temperature, thereby increasing the risk of overheating. That is, when the temperature of the heating core is low, by limiting the current passing through it, that is, limiting its heating power, it can ensure that the heating core works at a safe temperature rise rate, preventing safety hazards caused by too fast a temperature rise.

[0097] If the heating power of the target heating core is less than or equal to the preset limit power, the new duty cycle is still determined based on the temperature difference between the air outlet temperature and the target air outlet temperature.

[0098] If the heating power of the target heating core is greater than the preset limit power, a new duty cycle is determined according to the preset limit power, that is, the heating power of the target heating core is reduced by reducing the duty cycle of the PWM signal.

[0099] In another embodiment, the step of adjusting the duty cycle includes:

[0100] Determine whether the core temperature is greater than the preset temperature;

[0101] If so, determine a new duty cycle based on the temperature difference between the air outlet temperature and the target air outlet temperature;

[0102] If not, enter the power limit mode and start timing, and exit the power limit mode after the timing time is longer than the preset time;

[0103] In the power limiting mode, determining whether the heating power is greater than the preset limiting power;

[0104] If the heating power is greater than the preset limit power, a new duty cycle is determined according to the preset limit power;

[0105] If the heating power is less than or equal to the preset limit power, a new duty cycle is determined according to the temperature difference between the air outlet temperature and the target air outlet temperature.

[0106] In this embodiment, the duration of the power limit mode can be set, and the time after entering the power limit mode reaches the preset time as the condition for exiting the power limit mode. This can avoid frequent entry and exit of the power limit mode due to slight changes in the core temperature, and can maintain a stable temperature change within a certain period of time.

[0107] For example, see Figure 4 , starting from the time of entering the power limit mode, and exiting the power limit mode after the timing reaches the preset time.

[0108] In the power limiting mode, if the heating power of the target heating core is greater than the preset limiting power, a new duty cycle is determined according to the preset limiting power. If the heating power of the target heating core is less than or equal to the preset limiting power, a new duty cycle is determined according to the temperature difference between the air outlet temperature and the target air outlet temperature.

[0109] After exiting the power limiting mode, the core temperature and heating power of the target heating core, as well as the air outlet temperature and target air outlet temperature of the air conditioning equipment are continuously monitored in real time, and it is periodically determined whether the core temperature is greater than the preset temperature.

[0110] In this embodiment, the core temperature and heating power of the target heating core, the outlet temperature of the air-conditioning system and the target outlet temperature are monitored in real time, and different strategies are selected to adjust the duty cycle of the PWM signal according to the core temperature and heating power of the target heating core, so as to accurately control the heating power of the target heating core, quickly respond to temperature changes and avoid unnecessary energy consumption.

[0111] It should be understood that although Figure 3 and Figure 4 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 3 and Figure 4 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0112] Corresponding to the aforementioned control method of the PTC heater, the present application also provides a control device of the PTC heater.

[0113] In one embodiment, the PTC heater includes a plurality of heating cores, and the plurality of heating cores are respectively arranged on different control branches, and the control device includes:

[0114] The heating control module is used to respond to the heating start signal and turn on different control branches in turn so that multiple heating cores work in turn.

[0115] The specific definition of the control device of the PTC heater can be found in the definition of the control method of the PTC heater above, which will not be repeated here. Each module in the control device of the PTC heater can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0116] Corresponding to the control device of the aforementioned PTC heater, the present application also provides a car, comprising the control device in the aforementioned embodiment.

[0117] The present application also provides a computer device. In one embodiment, the computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the control method of the PTC heater in the above embodiment are implemented.

[0118] In one embodiment, the computer device may be a terminal, such as an air conditioning device, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a control method for a PTC heater is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0119] Those skilled in the art will understand that Figure 5The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0120] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the control method of the PTC heater in the above embodiment are implemented.

[0121] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0122] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0123] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A control method for a PTC heater, characterized in that: The PTC heater comprises a plurality of heating cores, and the plurality of heating cores are respectively arranged on different control branches; The control method comprises: In response to the heating start signal, different control branches are turned on in turn so that the multiple heating cores work in turn.

2. The control method according to claim 1, characterized in that: After the step of conducting different control branches in turn, the method further includes: Get the air outlet temperature and target air outlet temperature of the air conditioner; Determining a duty cycle of a PWM signal according to the air outlet temperature and the target air outlet temperature; The PWM signal is generated according to the duty cycle and input into the PTC heater, so that the PWM signal is input into the target heating core, which is the heating core on the control branch in the on state, and the PWM signal is used to control the heating power of the target heating core.

3. The control method according to claim 2, characterized in that: After the step of generating the PWM signal according to the duty cycle and inputting the PWM signal into the PTC heater, the method further includes: Monitoring the core temperature and heating power of the target heating core, as well as the air outlet temperature and target air outlet temperature of the air conditioning equipment; The duty cycle is adjusted according to the core temperature, the heating power, the air outlet temperature and the target air outlet temperature.

4. The control method according to claim 3, characterized in that: The step of adjusting the duty cycle comprises: Determining whether the core temperature is greater than a preset temperature; If so, determining a new duty cycle according to the temperature difference between the air outlet temperature and the target air outlet temperature; If not, determining whether the heating power is greater than a preset limit power; If the heating power is greater than the preset limit power, determining a new duty cycle according to the preset limit power; If the heating power is less than or equal to the preset limit power, a new duty cycle is determined according to the temperature difference between the air outlet temperature and the target air outlet temperature.

5. The control method according to claim 3, characterized in that: The step of adjusting the duty cycle comprises: Determining whether the core temperature is greater than a preset temperature; If so, determining a new duty cycle according to the temperature difference between the air outlet temperature and the target air outlet temperature; If not, enter the power limit mode and start timing, and exit the power limit mode after the timing time is longer than the preset time; In the power limiting mode, determining whether the heating power is greater than a preset limiting power; If the heating power is greater than the preset limit power, determining a new duty cycle according to the preset limit power; If the heating power is less than or equal to the preset limit power, a new duty cycle is determined according to the temperature difference between the air outlet temperature and the target air outlet temperature.

6. The control method according to any one of claims 1 to 5, characterized in that: Each control branch is provided with an IGBT and the heating core in sequence; The step of conducting different control branches in turn comprises: The IGBTs are controlled to close in turn, so that the heating cores corresponding to the IGBTs work in turn.

7. A control device for a PTC heater, characterized in that: The PTC heater comprises a plurality of heating cores, and the plurality of heating cores are respectively arranged on different control branches; The control device comprises: The heating control module is used to respond to the heating start signal and conduct different control branches in turn so that the multiple heating cores work in turn.

8. A car, characterized in that: The vehicle comprises a control device as claimed in claim 7.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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