CN-121995983-A - Fuel cell test fixture temperature control method and system based on dynamic PID optimization

CN121995983ACN 121995983 ACN121995983 ACN 121995983ACN-121995983-A

Abstract

The invention relates to a temperature control method and a temperature control system for a fuel cell test fixture based on dynamic PID optimization, comprising the steps of obtaining a target working temperature and a temperature uniformity threshold value of the fuel cell test fixture, dividing a plurality of heating temperature difference intervals, and configuring differentiated PID initial parameters for each heating temperature difference interval; the method comprises the steps of synchronously collecting temperature data of a plurality of areas of a fuel cell test fixture in real time, calculating the overall average temperature of the fixture and the local temperature difference among the areas, judging whether the current heating requirement state or the current cooling requirement state is needed or not based on the relation between the local temperature difference and a temperature uniformity threshold value, and periodically carrying out fine adjustment on dynamic PID parameters corresponding to the current heating temperature difference interval according to the overall temperature fluctuation and the local temperature difference in the temperature control process.

Inventors

TANG FUMIN
ZHANG RUOJING
ZHU HAOMIN
YU ZHUOPING
PAN XIANGMIN

Assignees

上海智能新能源汽车科创功能平台有限公司

Dates

Publication Date: 20260508
Application Date: 20251230

Claims (10)

1. The fuel cell test fixture temperature control method based on dynamic PID optimization is characterized by comprising the following steps: acquiring a target working temperature and a temperature uniformity threshold of a fuel cell test fixture, dividing a plurality of heating temperature difference intervals, and configuring differentiated PID initial parameters for each heating temperature difference interval; synchronously acquiring temperature data of a plurality of areas of the fuel cell test clamp in real time, and calculating the overall average temperature of the clamp and the local temperature difference between the areas; Based on the relation between the overall average temperature and the target working temperature, judging whether the current state is in an overall heating demand state or an overall cooling demand state, judging whether local temperature compensation is needed or not based on the relation between the local temperature difference and the temperature uniformity threshold; If the heating power is in the integral heating demand state, the corresponding dynamic PID parameter is called to calculate the basic heating power according to the heating temperature difference interval to which the integral average temperature belongs; If the local temperature compensation is judged to be needed, additional cooling compensation power is applied to the corresponding area according to the local temperature difference direction; And periodically carrying out fine adjustment on the dynamic PID parameters corresponding to the current heating temperature difference interval according to the overall temperature fluctuation and the local temperature difference condition in the temperature control process.
2. The method for controlling the temperature of the fuel cell test fixture based on dynamic PID optimization according to claim 1, wherein the heating temperature difference section is divided into a large temperature difference section, a medium temperature difference section and a small temperature difference section, wherein the initial PID parameter proportionality coefficient configured in the large temperature difference section is larger than a reference value, the integral coefficient is smaller than the reference value, the initial PID parameter proportionality coefficient configured in the small temperature difference section is smaller than the reference value, the integral coefficient is larger than the reference value, and the initial PID parameter proportionality coefficient and the integral coefficient configured in the medium temperature difference section are both close to or equal to the reference value.
3. The fuel cell test fixture temperature control method based on dynamic PID optimization of claim 1, wherein applying additional heating compensation power to the respective region comprises: When the local temperature difference exceeds the temperature uniformity threshold and the temperature of the core test area is lower than the temperature of the edge area, the heating power of the core test area is increased; And when the local temperature difference exceeds the temperature uniformity threshold and the temperature of the edge area is lower than the temperature of the core test area, increasing the heating power of the edge area.
4. The method for controlling temperature of a fuel cell test fixture based on dynamic PID optimization of claim 1, wherein the base cooling power is calculated using the following formula: Wherein, the As a basis for the cooling power of the air, For a preset cooling coefficient, the temperature of the cooling medium is controlled, And discharging current for the membrane electrode.
5. The method for controlling temperature of a fuel cell testing fixture based on dynamic PID optimization according to claim 1, wherein the fine tuning of the dynamic PID parameter corresponding to the current heating temperature difference interval comprises the following steps: if the integral temperature fluctuation amplitude continuously exceeds a preset stability threshold, adjusting the proportional coefficient and/or integral coefficient of the current PID parameter; and if the local temperature difference is continuously close to but does not exceed the temperature uniformity threshold, keeping the current PID parameters unchanged.
6. A fuel cell test fixture temperature control system based on dynamic PID optimization, which is used for implementing the fuel cell test fixture temperature control method according to any one of claims 1-5, the system comprising: The initialization configuration module is used for setting a target working temperature and a temperature uniformity threshold value of the fuel cell test fixture, dividing a heating temperature difference interval and configuring dynamic PID parameters of each interval; The data acquisition and processing module is used for synchronously acquiring temperature data from temperature sensors arranged in a plurality of areas of the clamp, and calculating the overall average temperature of the clamp and the local temperature difference between the areas; The state judging module is used for judging the state of the whole temperature control requirement and the local compensation requirement based on the whole average temperature and the local temperature difference among all the areas; And the regulation and control execution module is used for executing corresponding inter-partition dynamic PID power calculation and/or local compensation power output according to the output of the state judgment module.
7. The fuel cell test fixture temperature control system based on dynamic PID optimization of claim 6, wherein the regulation and control execution module comprises: the power calculation unit is used for calling corresponding dynamic PID parameters to calculate basic heating power or basic cooling power according to the heating temperature difference interval to which the overall average temperature belongs; And the local compensation unit is used for calculating and outputting additional heating or cooling compensation power to the target area according to the local temperature difference direction when the local compensation is needed.
8. The fuel cell test fixture temperature control system based on dynamic PID optimization of claim 7, wherein the local compensation unit is configured to output an enhanced heating power to the core test zone heater when the core test zone temperature is lower than the edge zone temperature, and to output an enhanced heating power to the edge zone heater when the edge zone temperature is lower than the core test zone temperature.
9. The dynamic PID optimization based fuel cell test fixture temperature control system of claim 6, further comprising: And the PID parameter optimization module is used for monitoring the temperature control effect in a fixed period and dynamically fine-adjusting PID parameters corresponding to the currently effective heating temperature difference interval according to the overall temperature fluctuation and the local temperature difference condition.
10. An electronic device comprising one or more processors, memory, and one or more programs stored in the memory, the one or more programs comprising instructions for performing the dynamic PID optimization-based fuel cell test fixture temperature control method of any of claims 1-5.

Description

Fuel cell test fixture temperature control method and system based on dynamic PID optimization Technical Field The invention relates to the technical field of fuel cell testing, in particular to a temperature control method and a temperature control system for a fuel cell testing clamp based on dynamic PID optimization. Background The proton exchange membrane fuel cell is widely applied in the field of new energy, the membrane electrode is used as a core component of the proton exchange membrane fuel cell, and the accuracy of a performance test result directly influences the research and development efficiency and reliability of the whole fuel cell. In the membrane electrode performance test, the working temperature of the clamp for testing the single cell of the fuel cell needs to be stabilized at a set value by external heating so as to meet the requirement of test conditions. At present, external heating modes of the fuel cell clamp are mainly divided into two types, namely one type is used for heating and preserving heat through heating liquid, and the other type is used for heating and preserving heat through an electric heater, such as an electric heating rod, an electric heating sheet and the like, and ohmic heating effect is utilized. The core logic of the existing electric heating temperature control technology is as follows. The temperature value of the clamp is acquired in real time through the temperature sensor, and the output power of the electric heater is regulated according to the difference value between the current temperature and the set temperature by utilizing the PID algorithm, so that the rapid temperature rise and heat preservation are realized. However, this prior art has significant drawbacks in practical applications. Because the heat conduction itself has hysteresis quality, and the membrane electrode can produce a large amount of exotherms in the course of the work, only relies on the single accuse temperature logic of temperature difference and PID regulation, is difficult to respond to temperature variation in real time, often leads to anchor clamps operating temperature to surpass the setting value, and the difficult problem of cooling appears, can't realize the accurate regulation and control to anchor clamps temperature, and then influences the accuracy of membrane electrode performance test. In summary, there is currently a lack of a fuel cell test fixture temperature control method and system to solve or partially solve the foregoing problems. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a fuel cell test fixture temperature control method and system based on dynamic PID optimization, so as to realize dynamic accurate temperature control of different areas of the fuel cell test fixture. The aim of the invention can be achieved by the following technical scheme: in one aspect of the invention, a temperature control method for a fuel cell test fixture based on dynamic PID optimization is provided, comprising the following steps: acquiring a target working temperature and a temperature uniformity threshold of a fuel cell test fixture, dividing a plurality of heating temperature difference intervals, and configuring differentiated PID initial parameters for each heating temperature difference interval; synchronously acquiring temperature data of a plurality of areas of the fuel cell test clamp in real time, and calculating the overall average temperature of the clamp and the local temperature difference between the areas; Based on the relation between the overall average temperature and the target working temperature, judging whether the current state is in an overall heating demand state or an overall cooling demand state, judging whether local temperature compensation is needed or not based on the relation between the local temperature difference and the temperature uniformity threshold; If the heating power is in the integral heating demand state, the corresponding dynamic PID parameter is called to calculate the basic heating power according to the heating temperature difference interval to which the integral average temperature belongs; If the local temperature compensation is judged to be needed, additional cooling compensation power is applied to the corresponding area according to the local temperature difference direction; And periodically carrying out fine adjustment on the dynamic PID parameters corresponding to the current heating temperature difference interval according to the overall temperature fluctuation and the local temperature difference condition in the temperature control process. The heating temperature difference interval is divided into a large temperature difference interval, a medium temperature difference interval and a small temperature difference interval, wherein the initial PID parameter proportionality coefficient configured in the large temperature difference interval is larger than a refere