PTC heater output power control method and system

Abstract

The invention relates to the technical field of PTC heaters, in particular to a PTC heater output power control method and system, and the method comprises the steps: obtaining the target power, the high-voltage current value and the high-voltage voltage value of a PTC heater, calculating the difference value between the current output power of the PTC heater and the target power, and dynamically adjusting the PID parameters of a PID controller according to the difference value. Finally, the output power is stabilized to the target power, the core of the method is to realize the function of dynamically adjusting the PID parameters, and the problem of overlarge power fluctuation caused by the change of environmental factors can be effectively solved; compared with traditional fixed PID parameter control, the method has the advantages that when environmental factors change, the output power can be stabilized to the target power within a short time through dynamic adaptation of parameters, the flexibility of a closed-loop control system is remarkably improved, and stable operation of the PTC heater under complex working conditions is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of PTC heaters, and in particular to a method and system for controlling the output power of a PTC heater. Background Art

[0002] In PTC heater applications, the stability of their output power is crucial to system performance. Traditional PTC heater power control often uses a control algorithm with fixed PID parameters. This algorithm can basically maintain power output when environmental factors are stable. However, when environmental factors (such as transient changes in high-voltage voltage values, ambient temperature fluctuations, changes in coolant flow, etc.) change, the fixed PID parameters cannot adapt to the changing operating conditions in a timely manner, resulting in excessive fluctuations in the PTC heater's output power. It takes a long time to stabilize to the target power again, seriously affecting the system's operational stability and energy efficiency, and also having an adverse impact on driving comfort and the life of related equipment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for controlling the output power of a PTC heater, which solves the problem of excessive power fluctuations caused by changes in environmental factors by realizing dynamic adjustment of PID parameters, so that the output power can be stabilized to the target power in a short time, thereby improving the flexibility of the closed-loop control system and thus enhancing the power control stability and reliability of the PTC heater.

[0004] In order to solve the above technical problems, the first technical solution adopted by the present invention is: A method for controlling the output power of a PTC heater comprises the following steps: S1. Obtain the target power, high voltage current value, and high voltage value of the PTC heater; S2. Obtaining the current output power of the PTC heater according to the high-voltage current value and the high-voltage voltage value; S3. Calculating the difference between the target power and the output power, and dynamically adjusting the PID parameters of the PID controller according to the difference; S4. Control the output power of the PTC heater according to the adjusted PID parameters, so that the current output power of the PTC heater is stabilized to the target power.

[0005] The second technical solution adopted by the present invention is: A PTC heater output power control system includes one or more processors and a memory, wherein the memory stores a program that, when executed by the processor, implements the following steps: S1. Obtain the target power, high voltage current value, and high voltage value of the PTC heater; S2. Obtaining the current output power of the PTC heater according to the high-voltage current value and the high-voltage voltage value; S3. Calculating the difference between the target power and the output power, and dynamically adjusting the PID parameters of the PID controller according to the difference; S4. Control the output power of the PTC heater according to the adjusted PID parameters, so that the current output power of the PTC heater is stabilized to the target power.

[0006] The beneficial effects of the present invention are: This solution obtains the target power, high-voltage current value and high-voltage voltage value of the PTC heater, calculates the difference between the current power of the PTC heater and the target power, and dynamically adjusts the PID parameters of the PID controller based on the difference, ultimately achieving output power stabilization to the target power. The core of this method is to realize the function of dynamic adjustment of PID parameters, which can effectively solve the problem of excessive power fluctuation caused by changes in environmental factors (such as transient changes in high-voltage voltage values, changes in ambient temperature, changes in coolant flow, etc.); compared with traditional fixed PID parameter control, it can dynamically adapt parameters when environmental factors change, so that the output power can be stabilized to the target power in a short time, significantly improving the flexibility of the closed-loop control system and ensuring the stable operation of the PTC heater under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 Flow chart of the steps of the method for controlling the output power of a PTC heater according to the present invention; Figure 2 This is a connection block diagram of the PTC heater output power control system of the present invention; Description of labels: 1. Processor; 2. Memory. DETAILED DESCRIPTION

[0008] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0009] Please refer to Figure 1 , the first technical solution adopted by the present invention is: A method for controlling the output power of a PTC heater comprises the following steps: S1. Obtain the target power, high voltage current value, and high voltage value of the PTC heater; S2. Obtaining the current output power of the PTC heater according to the high-voltage current value and the high-voltage voltage value; S3. Calculating the difference between the target power and the output power, and dynamically adjusting the PID parameters of the PID controller according to the difference; S4. Control the output power of the PTC heater according to the adjusted PID parameters, so that the current output power of the PTC heater is stabilized to the target power.

[0010] From the above description, it can be seen that the beneficial effects of the present invention are: This solution obtains the target power, high-voltage current value and high-voltage voltage value of the PTC heater, calculates the difference between the current power of the PTC heater and the target power, and dynamically adjusts the PID parameters of the PID controller based on the difference, ultimately achieving output power stabilization to the target power. The core of this method is to realize the function of dynamic adjustment of PID parameters, which can effectively solve the problem of excessive power fluctuation caused by changes in environmental factors (such as transient changes in high-voltage voltage values, changes in ambient temperature, changes in coolant flow, etc.); compared with traditional fixed PID parameter control, it can dynamically adapt parameters when environmental factors change, so that the output power can be stabilized to the target power in a short time, significantly improving the flexibility of the closed-loop control system and ensuring the stable operation of the PTC heater under complex working conditions.

[0011] Furthermore, in step S3, the PID parameters include the proportional coefficient , integral coefficient and differential coefficients , the dynamic adjustment includes the proportional coefficient , integral coefficient and differential coefficients 's separate adjustments.

[0012] From the above description, it can be seen that by further clarifying that the PID parameters include proportional coefficient, integral coefficient and differential coefficient, and they need to be dynamically adjusted separately, this limitation allows each parameter to perform its respective function in the control process. The proportional coefficient can enhance the response speed to the current deviation, the integral coefficient can eliminate the steady-state error, and the differential coefficient can suppress overshoot and fluctuation. Through multi-dimensional collaborative optimization, the limitations of single parameter adjustment are avoided, the power fluctuation amplitude is further reduced, the time for the system to enter steady state is accelerated, and the control accuracy is improved.

[0013] Furthermore, the proportional coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0014] From the above description, it can be seen that by limiting the dynamic adjustment relationship of the proportional coefficient, the proportional coefficient can be flexibly changed with the power difference; when the deviation is large, the proportional coefficient increases, which can speed up the system's response to the deviation; when the deviation is small, the proportional coefficient decreases accordingly to avoid overshoot; this "deviation adaptive" adjustment method balances the needs of fast response and smooth adjustment, improves the problems of "slow response when the deviation is large" or "large fluctuation when the deviation is small" under the traditional fixed proportional coefficient, and enhances the dynamic adaptability of power control.

[0015] Furthermore, the differential coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0016] From the above description, it can be seen that by limiting the dynamic adjustment relationship of the differential coefficient, the differential coefficient can be dynamically changed with the power difference; when the power change rate is large and the deviation increases rapidly, the differential coefficient is enhanced, which can effectively suppress the fluctuation trend and reduce overshoot; when the power tends to be stable, the differential coefficient is weakened to avoid the slow response caused by excessive suppression; this feature effectively suppresses transient power fluctuations under working conditions such as voltage jumps and sudden changes in ambient temperature, shortens the time it takes for the system to enter a steady state, and improves the system's anti-interference ability.

[0017] Furthermore, the integral coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0018] From the above description, it can be seen that by limiting the dynamic adjustment relationship of the integral coefficient, the integral coefficient is adjusted according to the power difference; when there is a cumulative error and the deviation persists, the integral coefficient is enhanced to quickly eliminate the steady-state error; when the deviation is small, the integral coefficient is weakened to avoid overshoot caused by integral saturation; this solves the problems of "excessive integration leading to fluctuations when the deviation is small" or "insufficient integration leading to residual errors when the deviation is large" under the traditional fixed integral coefficient, and improves the steady-state accuracy of power control.

[0019] Please refer to Figure 2, the second technical solution adopted by the present invention is: A PTC heater output power control system includes one or more processors 1 and a memory 2. The memory 2 stores a program that, when executed by the processor 1, implements the following steps: S1. Obtain the target power, high voltage current value, and high voltage value of the PTC heater; S2. Obtaining the current output power of the PTC heater according to the high-voltage current value and the high-voltage voltage value; S3. Calculating the difference between the target power and the output power, and dynamically adjusting the PID parameters of the PID controller according to the difference; S4. Control the output power of the PTC heater according to the adjusted PID parameters, so that the current output power of the PTC heater is stabilized to the target power.

[0020] From the above description, it can be seen that the beneficial effects of the present invention are: This solution obtains the target power, high-voltage current value and high-voltage voltage value of the PTC heater, calculates the difference between the current power of the PTC heater and the target power, and dynamically adjusts the PID parameters of the PID controller based on the difference, ultimately achieving output power stabilization to the target power. The core of this method is to realize the function of dynamic adjustment of PID parameters, which can effectively solve the problem of excessive power fluctuation caused by changes in environmental factors (such as transient changes in high-voltage voltage values, changes in ambient temperature, changes in coolant flow, etc.); compared with traditional fixed PID parameter control, it can dynamically adapt parameters when environmental factors change, so that the output power can be stabilized to the target power in a short time, significantly improving the flexibility of the closed-loop control system and ensuring the stable operation of the PTC heater under complex working conditions.

[0021] Furthermore, when the program is executed by the processor 1, the following steps are implemented: In step S3, the PID parameters include the proportional coefficient , integral coefficient and differential coefficients , the dynamic adjustment includes the proportional coefficient , integral coefficient and differential coefficients 's separate adjustments.

[0022] From the above description, it can be seen that by further clarifying that the PID parameters include proportional coefficient, integral coefficient and differential coefficient, and they need to be dynamically adjusted separately, this limitation allows each parameter to perform its respective function in the control process. The proportional coefficient can enhance the response speed to the current deviation, the integral coefficient can eliminate the steady-state error, and the differential coefficient can suppress overshoot and fluctuation. Through multi-dimensional collaborative optimization, the limitations of single parameter adjustment are avoided, the power fluctuation amplitude is further reduced, the time for the system to enter steady state is accelerated, and the control accuracy is improved.

[0023] Furthermore, when the program is executed by the processor 1, the following steps are implemented: The proportionality coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0024] From the above description, it can be seen that by limiting the dynamic adjustment relationship of the proportional coefficient, the proportional coefficient can be flexibly changed with the power difference; when the deviation is large, the proportional coefficient increases, which can speed up the system's response to the deviation; when the deviation is small, the proportional coefficient decreases accordingly to avoid overshoot; this "deviation adaptive" adjustment method balances the needs of fast response and smooth adjustment, improves the problems of "slow response when the deviation is large" or "large fluctuation when the deviation is small" under the traditional fixed proportional coefficient, and enhances the dynamic adaptability of power control.

[0025] Furthermore, when the program is executed by the processor 1, the following steps are implemented: For the differential coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0026] From the above description, it can be seen that by limiting the dynamic adjustment relationship of the differential coefficient, the differential coefficient can be dynamically changed with the power difference; when the power change rate is large and the deviation increases rapidly, the differential coefficient is enhanced, which can effectively suppress the fluctuation trend and reduce overshoot; when the power tends to be stable, the differential coefficient is weakened to avoid the slow response caused by excessive suppression; this feature effectively suppresses transient power fluctuations under working conditions such as voltage jumps and sudden changes in ambient temperature, shortens the time it takes for the system to enter a steady state, and improves the system's anti-interference ability.

[0027] Furthermore, when the program is executed by the processor 1, the following steps are implemented: The integral coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0028] From the above description, it can be seen that by limiting the dynamic adjustment relationship of the integral coefficient, the integral coefficient is adjusted according to the power difference; when there is a cumulative error and the deviation persists, the integral coefficient is enhanced to quickly eliminate the steady-state error; when the deviation is small, the integral coefficient is weakened to avoid overshoot caused by integral saturation; this solves the problems of "excessive integration leading to fluctuations when the deviation is small" or "insufficient integration leading to residual errors when the deviation is large" under the traditional fixed integral coefficient, and improves the steady-state accuracy of power control.

[0029] Please refer to Figure 1 , embodiment 1 of the present invention is: A method for controlling the output power of a PTC heater comprises the following steps: S1. Obtain the target power, high voltage current value, and high voltage value of the PTC heater; A PTC heater is a device that utilizes the properties of PTC ceramic materials (Positive Temperature Coefficient, or PTC ceramics) for heating. Its core principle is to achieve automatic temperature control and efficient heating by taking advantage of the fact that the resistance of the PTC material changes significantly with temperature.

[0030] Simply put, "PTC" stands for "positive temperature coefficient," referring to the material's low resistance at low temperatures, allowing it to pass large currents and rapidly generate heat. However, when the temperature rises to a certain critical value (the Curie temperature), the resistance increases dramatically, significantly reducing the current, thus limiting further heat buildup and achieving "temperature self-limiting." Therefore, PTC heaters automatically maintain a relatively stable temperature range without the need for complex external temperature control devices, offering safety, energy savings, and constant temperature.

[0031] This type of heater is widely used in home appliances (such as heaters, air conditioning auxiliary heating), automobiles (such as seat heating, window defrosting), industrial equipment and other fields. It is an efficient and safe heating solution.

[0032] In this embodiment, the target power of the PTC heater can be obtained from the host computer via the vehicle bus signal, specifically: The host computer usually refers to the vehicle controller, which generates the target power instruction for the PTC heater based on the vehicle's thermal management requirements (such as the set temperature for cabin heating, battery preheating requirements, etc.). The instruction is transmitted to the control module of the PTC heater (such as the PTC controller) in the form of a signal via the CAN bus. The control module extracts the target power value by parsing the signal frame on the CAN bus, which serves as the basis for power regulation.

[0033] The high voltage current value of the PTC heater can be collected by the current sensor, specifically: A Hall current sensor connected in series in the high-voltage circuit of the PTC heater uses the Hall effect to convert the large current in the high-voltage circuit into a measurable weak current signal (such as a voltage signal), and has the characteristics of good isolation and high measurement accuracy; the Hall current sensor monitors the high-voltage circuit current of the PTC heater in real time when it is working, converts the current signal into an analog voltage signal proportional to the current magnitude, and transmits it to the AD sampling port of the control module of the PTC heater; the control module of the PTC heater converts the analog voltage signal into a digital quantity through AD conversion, and then calculates the actual high-voltage current value based on the calibration coefficient of the sensor.

[0034] The high voltage value of the PTC heater can be collected by the voltage sensor, specifically: A voltage divider voltage sensor connected in parallel to the power supply end of the PTC heater is used to convert the high voltage into a low voltage signal through a resistor voltage divider network to achieve safe measurement of the high voltage; the voltage divider voltage sensor monitors the power supply voltage of the PTC heater in real time, divides the high voltage signal proportionally and outputs it to the AD sampling port of the control module of the PTC heater; the control module of the PTC heater converts the analog voltage signal into a digital quantity through AD conversion, and then calculates the actual high voltage value based on the voltage divider ratio.

[0035] S2. Obtaining the current output power of the PTC heater according to the high-voltage current value and the high-voltage voltage value; In step S2, according to the electric power calculation formula , get the current output power of the PTC heater; in is the current output power of the PTC heater, is the high voltage value of the PTC heater obtained in step S1, is the high voltage current value of the PTC heater obtained in step S1.

[0036] S3. Calculating the difference between the target power and the output power, and dynamically adjusting the PID parameters of the PID controller according to the difference; The PID controller is a closed-loop control algorithm device widely used in the field of industrial control. Its name comes from the three core control links of proportional, integral, and derivative.

[0037] Its basic principle is: by comparing the actual output value of the system with the target setting value, the deviation (error) is calculated, and then according to the size, cumulative degree and change rate of the deviation, a control signal is output through the coordinated action of the three links of proportion, integration and differentiation to adjust the actuator (such as valves, motors, etc.) so that the actual output of the system gradually approaches and stabilizes at the target value, thereby achieving precise control.

[0038] For example, in a temperature control system, if the target temperature is 100°C and the actual temperature is 80°C, the PID controller will quickly adjust the heating power based on the deviation between the two (20°C) through the proportional link (the larger the deviation, the stronger the adjustment force), the integral link will eliminate long-term small deviations (for example, a constant difference of 2°C), and the differential link will predict the temperature change trend (for example, reducing the heating power in advance if the temperature rises too quickly), ultimately stabilizing the temperature at around 100°C.

[0039] The advantages of PID controller are simple structure, strong robustness (adaptability to different system characteristics), and high adjustment accuracy. Therefore, it is widely used in the automatic control of various physical quantities such as temperature, pressure, flow, liquid level, etc.

[0040] S4. Control the output power of the PTC heater according to the adjusted PID parameters, so that the current output power of the PTC heater is stabilized to the target power.

[0041] In step S3, the PID parameters include the proportional coefficient , integral coefficient and differential coefficients , the dynamic adjustment includes the proportional coefficient , integral coefficient and differential coefficients 's separate adjustments.

[0042] The proportionality coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0043] For the differential coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0044] The integral coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0045] Assume that the initial values ​​of the PID parameters of the hydrothermal PTC power closed loop are = 50, = 50, = 2, = 6667; The target power of the PTC heater is 4000W, the high voltage value is 400V, and the high voltage current value is 10A. When the environmental variables are stable, the current output power of the PTC heater is 4000W. If the voltage jumps from 400V to 500V at this time, because the resistance is related to the temperature, and the temperature change has a lag, the current jumps in a short time and jumps to 11A. In this way, the current output power of the PTC heater is 5500W. At this time, the calculated The parameter is 1500W; Will =1500 Substitute into the above three equations, and we get = 61.249, = 61.249, =2.449; The PID closed-loop output power is calculated based on a new set of PID parameters, and the output power can be quickly and stably reached 4000W.

[0046] Please refer to Figure 2 , the second embodiment of the present invention is: A PTC heater output power control system includes one or more processors 1 and a memory 2. The memory 2 stores a program that, when executed by the processor 1, implements the following steps: S1. Obtain the target power, high voltage current value, and high voltage value of the PTC heater; In this embodiment, the target power of the PTC heater can be obtained from the host computer via the vehicle bus signal, specifically: The host computer usually refers to the vehicle controller, which generates the target power instruction for the PTC heater based on the vehicle's thermal management requirements (such as the set temperature for cabin heating, battery preheating requirements, etc.). The instruction is transmitted to the control module of the PTC heater (such as the PTC controller) in the form of a signal via the CAN bus. The control module extracts the target power value by parsing the signal frame on the CAN bus, which serves as the basis for power regulation.

[0047] The high voltage current value of the PTC heater can be collected by the current sensor, specifically: A Hall current sensor connected in series in the high-voltage circuit of the PTC heater uses the Hall effect to convert the large current in the high-voltage circuit into a measurable weak current signal (such as a voltage signal). It has the characteristics of good isolation and high measurement accuracy. The Hall current sensor monitors the high-voltage circuit current of the PTC heater in real time when it is working, converts the current signal into an analog voltage signal proportional to the current magnitude, and transmits it to the AD sampling port of the control module of the PTC heater. The control module of the PTC heater converts the analog voltage signal into a digital quantity through AD conversion, and then calculates the actual high-voltage current value based on the calibration coefficient of the sensor.

[0048] The high voltage value of the PTC heater can be collected by the voltage sensor, specifically: A voltage divider voltage sensor connected in parallel to the power supply end of the PTC heater is used to convert the high voltage into a low voltage signal through a resistor voltage divider network to achieve safe measurement of the high voltage; the voltage divider voltage sensor monitors the power supply voltage of the PTC heater in real time, divides the high voltage signal proportionally and outputs it to the AD sampling port of the control module of the PTC heater; the control module of the PTC heater converts the analog voltage signal into a digital quantity through AD conversion, and then calculates the actual high voltage value based on the voltage divider ratio.

[0049] S2. Obtaining the current output power of the PTC heater according to the high-voltage current value and the high-voltage voltage value; In step S2, according to the electric power calculation formula , get the current output power of the PTC heater; in is the current output power of the PTC heater, is the high voltage value of the PTC heater obtained in step S1, is the high voltage current value of the PTC heater obtained in step S1.

[0050] S3. Calculating the difference between the target power and the output power, and dynamically adjusting the PID parameters of the PID controller according to the difference; S4. Control the output power of the PTC heater according to the adjusted PID parameters, so that the current output power of the PTC heater is stabilized to the target power.

[0051] When the program is executed by processor 1, the following steps are implemented: In step S3, the PID parameters include the proportional coefficient , integral coefficient and differential coefficients , the dynamic adjustment includes the proportional coefficient , integral coefficient and differential coefficients 's separate adjustments.

[0052] When the program is executed by processor 1, the following steps are implemented: The proportionality coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0053] When the program is executed by processor 1, the following steps are implemented: For the differential coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0054] When the program is executed by processor 1, the following steps are implemented: The integral coefficient The dynamic adjustment satisfies the following relationship: ; in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

[0055] In summary, the present invention provides a method and system for controlling the output power of a PTC heater. By obtaining the target power, high-voltage current value, and high-voltage voltage value of the PTC heater, the difference between the current power of the PTC heater and the target power is calculated, and the PID parameters of the PID controller are dynamically adjusted according to the difference, so as to finally stabilize the output power to the target power. The core of this method is to realize the function of dynamic adjustment of PID parameters, which can effectively solve the problem of excessive power fluctuation caused by changes in environmental factors (such as transient changes in high-voltage voltage values, changes in ambient temperature, changes in coolant flow, etc.); compared with traditional fixed PID parameter control, it can stabilize the output power to the target power in a short time through dynamic adaptation of parameters when environmental factors change, significantly improving the flexibility of the closed-loop control system and ensuring the stable operation of the PTC heater under complex working conditions.

[0056] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for controlling the output power of a PTC heater, characterized in that: The following steps are involved: S1. Obtain the target power, high voltage current value, and high voltage value of the PTC heater; S2. Obtaining the current output power of the PTC heater according to the high-voltage current value and the high-voltage voltage value; S3. Calculating the difference between the target power and the output power, and dynamically adjusting the PID parameters of the PID controller according to the difference; S4. Control the output power of the PTC heater according to the adjusted PID parameters, so that the current output power of the PTC heater is stabilized to the target power.

2. The heater output power control method according to claim 1, characterized in that: In step S3, the PID parameters include the proportional coefficient , integral coefficient and differential coefficients , the dynamic adjustment includes the proportional coefficient , integral coefficient and differential coefficients 's separate adjustments.

3. The heater output power control method according to claim 2, characterized in that: The proportionality coefficient The dynamic adjustment satisfies the following relationship: ； in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

4. The heater output power control method according to claim 2, characterized in that: For the differential coefficient The dynamic adjustment satisfies the following relationship: ； in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

5. The heater output power control method according to claim 2, characterized in that: The integral coefficient The dynamic adjustment satisfies the following relationship: ； in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

6. A PTC heater output power control system, characterized in that: The system comprises one or more processors and a memory, wherein the memory stores a program that, when executed by the processor, implements the following steps: S1. Obtain the target power, high voltage current value, and high voltage value of the PTC heater; S2. Obtaining the current output power of the PTC heater according to the high-voltage current value and the high-voltage voltage value; S3. Calculating the difference between the target power and the output power, and dynamically adjusting the PID parameters of the PID controller according to the difference; S4. Control the output power of the PTC heater according to the adjusted PID parameters, so that the current output power of the PTC heater is stabilized to the target power.

7. The PTC heater output power control system according to claim 6, characterized in that: When the program is executed by the processor, the following steps are performed: In step S3, the PID parameters include the proportional coefficient , integral coefficient and differential coefficients , the dynamic adjustment includes the proportional coefficient , integral coefficient and differential coefficients 's separate adjustments.

8. The PTC heater output power control system according to claim 7, characterized in that: When the program is executed by the processor, the following steps are performed: The proportionality coefficient The dynamic adjustment satisfies the following relationship: ； in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

9. The PTC heater output power control system according to claim 7, characterized in that: When the program is executed by the processor, the following steps are performed: For the differential coefficient The dynamic adjustment satisfies the following relationship: ； in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

10. The PTC heater output power control system according to claim 7, characterized in that: When the program is executed by the processor, the following steps are performed: The integral coefficient The dynamic adjustment satisfies the following relationship: ； in, is the adjusted proportional coefficient, for The initial value of is the difference, is the preset coefficient.

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