Variable frequency air conditioner indoor unit testing method and system
Through an automated test system that simulates actual operating conditions, the damper, electric heating, temperature sensor and fan motor of the variable frequency air conditioner internal unit is detected, and the problems of traditional tests are solved, achieving fast and accurate test results and reducing costs are achieved. effect.
Patent Information
- Application Number
- CN202411619401.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2024-12-31
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In traditional manual testing or inefficient automated testing environments, the test process of the variable frequency air conditioner internal unit takes a long time and low power, which can easily lead to human errors, affecting product quality and subsequent use.
Using an automated test system that simulates actual operating conditions, the working status of dampers, electric heating, temperature sensors and fan motors are detected through microcontrollers and embedded control software, key performance indicators are recorded, detection and control commands are automatically sent, and the operating status of the air conditioner internal unit is monitored. , reduce artificial dependence and improve detection speed and accuracy.
It realizes fast and accurate testing of frequency converter air conditioners, reduces labor costs and rework and maintenance costs, promptly detects unqualified products, and improves product quality and reliability of test results.
Smart Images
Figure CN119222720A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of air conditioner indoor unit testing, and in particular to a variable frequency air conditioner indoor unit testing method and system. Background Art
[0002] With the continuous development of frequency conversion technology, more and more air-conditioning products have begun to adopt frequency conversion technology to improve energy efficiency, reduce noise and improve comfort. This trend has led to an increase in the demand for testing of variable frequency air-conditioning indoor units to ensure the stability of product performance and quality. With the continuous development of measurement technology and computer technology, the development of air-conditioning testing technology has been accelerated. At the same time, consumers' awareness and requirements are getting higher and higher, prompting manufacturers to ensure that their products can meet consumer needs through rigorous testing.
[0003] In traditional manual testing or inefficient automated testing environments, the testing process of the indoor unit of a variable frequency air conditioner may be time-consuming and low-power, which will affect the overall capacity and power of the production line. In addition, long-term repeated testing and observation work can easily lead to worker fatigue, increasing the risk of human error, which in turn leads to misjudgment of test results, affecting product quality and subsequent use. To this end, a method and system for testing the indoor unit of a variable frequency air conditioner is proposed. Summary of the invention
[0004] The electric heating detection unit is used to detect the working state and heating power of the electric heating element, and evaluate whether the electric heating function is normal, and whether the heating speed and stable temperature meet the standards.
[0005] The temperature sensor detection unit is used to detect the reading accuracy and response time of the temperature sensor to ensure that the temperature sensor can accurately measure the ambient temperature and provide reliable data for air conditioning control; The fan motor detection unit is used to detect the start, run and stop status of the fan motor, evaluate the air volume, power and noise level, and ensure that the fan motor can provide sufficient air volume and appropriate wind speed while maintaining low noise and high power.
[0006] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art: The present invention provides a method and system for testing an indoor unit of a variable frequency air conditioner. By simulating actual operating conditions, the system continuously performs tests, thereby reducing delays and errors caused by manual operations, and automatically sends detection control commands to monitor the operating status of the indoor unit of the air conditioner, and records key performance indicators of air door detection, electric heating detection, temperature sensor detection, and fan motor detection. This not only improves the detection speed, but also reduces dependence on manual labor, reduces labor costs, and can promptly detect unqualified products, reducing the risk of defective products entering the market, thereby reducing rework and maintenance costs.
[0007] The present invention provides a method and system for testing an indoor unit of a variable frequency air conditioner. The method and system ensure the accuracy and consistency of the test results by controlling the test conditions and simulating the performance of the air conditioner in actual use. The method comprehensively evaluates the performance of the indoor unit of the air conditioner through strict inspection of key components such as the damper, electric heating, temperature sensor and fan motor, and timely discovers and eliminates potential defects. The method also comprehensively evaluates the performance of the indoor unit of the air conditioner, not only focusing on the cooling and heating effects, but also going deep into the working status of each key component, such as the adjustment accuracy and response time of the damper, the heating speed and power stability of the electric heating, the reading accuracy and error range of the temperature sensor, and the air volume, power and noise level of the fan motor, thereby ensuring the accuracy and reliability of the test results and providing strong support for improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.
[0009] Figure 1 is a flow chart of the method of the present invention; Figure 2 A flow chart for judging whether the functions of the indoor unit of the air conditioner of the present invention are normal; Figure 3 It is a module diagram of the present invention. DETAILED DESCRIPTION
[0010] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0011] Embodiment 1, as Figure 1 , Figure 2 As shown, the present invention provides a method for testing an indoor unit of a variable frequency air conditioner, comprising the following steps: Step 1: Power on the test system correctly, enter the standby state, and perform a system self-test. Use the single-chip microcomputer and embedded control software to simulate the actual operating environment of the air conditioner. Check that the power supply of the hardware equipment of the test system is correctly connected and the power supply is stable. Check the power line to ensure that the voltage and current meet the equipment requirements to avoid damage to the equipment due to overvoltage or overcurrent. The hardware equipment includes a single-chip microcomputer, a power module, a sensor, and an actuator. Insert the power plug into the power socket, turn on the power switch, start the test system, enter the power-on sequence, and start the power-on self-test program. Automatically perform hardware self-test, including but not limited to the status check of key hardware components such as the power module, communication interface, and sensor interface. Check whether the key components of the system, such as sensors, actuators, and communication interfaces, are working properly. After the self-test is completed, enter the standby state and wait. Receive the signal to start the test, configure the parameters of the single-chip microcomputer and embedded control software according to the test requirements, use the single-chip microcomputer and embedded software to simulate the operating conditions and environmental factors of the air conditioner, where the environmental factors include temperature, humidity, and wind speed. The parameters should be close to the actual air conditioner operating environment to ensure the accuracy and reliability of the test, analyze the communication connection status between the test system and the single-chip microcomputer, determine whether the communication connection is normal, ensure the accuracy and real-time performance of data transmission, and verify whether the control logic in the single-chip microcomputer and embedded software is correct, determine whether the startup, operation, and shutdown process of the air conditioner can be correctly simulated, run the test program in the simulated environment, check whether the test system can correctly respond to the control command, and simulate the normal working state of the air conditioner, confirm that all simulated environments and control logics are ready, and prepare to conduct actual tests on the air conditioner indoor unit; Step 2, turn on the power of the air conditioner indoor unit, send an automatic detection control command to the air conditioner indoor unit, enter the test mode, start the detection, detect the working status of the damper, electric heating, sensor, and fan motor in turn, record relevant data and evaluate key performance indicators, turn on the power of the air conditioner indoor unit, and perform a safety check at the same time. After the power line is checked and found to be correct, start the power of the air conditioner indoor unit and enter the standby state. Check whether the power line is intact and has no damage or aging. Plug the power cord of the air conditioner indoor unit into the power socket correctly, observe the indicator light on the air conditioner indoor unit, and confirm that the power is turned on and the equipment is in the standby state. The test system sends an automatic detection control command to the air conditioner indoor unit through the established communication connection. After receiving the control command, the air conditioner indoor unit enters the test mode and prepares to start various tests. The air conditioner indoor unit simulates actual operating conditions to detect the performance and stability of each component, detects the working status of the damper, electric heating, sensor, and fan motor in turn, sends a control command to open and close the damper, and detects the opening and closing status of the damper and Response speed, ensure that the damper can correctly adjust the wind direction and air volume, and record the key performance indicators of the damper opening angle and damper response time at different positions; send a command to start electric heating, perform functional tests on the electric heating elements, use temperature sensors to detect temperature changes in the electric heating area, and record the key performance indicators of heating speed and stable temperature value, evaluate whether the electric heating power meets the design requirements, and whether there are problems of overheating or uneven temperature; test the temperature sensors one by one, check whether the sensor readings are accurate by simulating different temperature environments, record the key performance indicators of sensor response time and error range, and evaluate its sensitivity and stability; send control commands to start the fan motor and run it at different speeds, observe the rotation of the fan, check whether there are abnormal sounds, vibrations or unstable speeds, use an anemometer to measure the air volume and speed of the fan at different speeds, record relevant data, and evaluate the key performance indicators of the fan motor's output power, power and noise level; Step 3, collect various detected data, and send the collected data to the test system through the communication module for analysis, and preset thresholds to determine whether various functions of the air conditioner indoor unit are normal, summarize various detected data, and send the collected data of key performance indicators of each component to the test system through the communication module for analysis, preset judgment thresholds for damper detection, electric heating detection, temperature sensor detection and fan motor detection, which are respectively the damper opening angle error threshold, response time threshold, heating speed threshold, stable temperature deviation threshold, power deviation threshold, temperature sensor reading accuracy threshold, sensor response time threshold, error range threshold, air volume deviation threshold, power threshold and noise level threshold, extract the key performance indicator data of the opening angle and response time of the damper detection, obtain the adjustment accuracy index and response time index, and compare them with the preset judgment thresholds. If they are within the normal threshold range, the damper function is judged to be normal, otherwise, the abnormality is recorded and marked as unqualified, and the heating speed and The key performance indicator data of the stable temperature value are obtained, the heating speed index and the power deviation index are obtained, and the stable temperature is checked to see if it meets the standard. If it is within the range of the normal threshold, the electric heating function is judged to be normal. Otherwise, the abnormality is recorded and marked as unqualified. The key performance indicator data of the response time and error range of the temperature sensor detection are extracted to obtain the reading accuracy index and the error range index. If they are compared with the preset judgment threshold, if they are within the range of the normal threshold, the temperature sensor function is judged to be normal. Otherwise, the abnormality is recorded and marked as unqualified. The key performance indicator data of the air volume, power and noise level of the fan motor detection are extracted to obtain the air volume index, power index and noise level index. If they are compared with the preset judgment threshold, if they are within the range of the normal threshold, the fan motor function is judged to be normal. Otherwise, the abnormality is recorded and marked as unqualified. The key performance indicator data of the air door detection, electric heating detection, temperature sensor detection and fan motor detection are integrated to analyze the abnormality of each detection indicator. Furthermore, the expression of the adjustment accuracy index is: ; in, is the regulation accuracy index, is the set opening angle, is the actual measured opening angle, is the maximum opening angle of the damper, is the number of tests. It should be noted that The lower the value, the higher the adjustment accuracy. The closer it is to 0%, the closer the actual opening angle of the damper is to the set angle, and the higher the adjustment accuracy; The expression for the response time index is: ; in, is the response time index, is the actual response time, is the target response time threshold. It should be noted that , indicating that the actual response time is less than the target response time, The smaller it is, the shorter the damper's response time is and the better the performance is. The expression for the heating rate index is: ; in, is the heating rate index, is the stable temperature, is the initial temperature, It is the time required from the start of heating to reaching a stable temperature. It should be noted that The higher it is, the shorter the time required from the initial temperature to the stable temperature, and the faster the heating speed; The expression of power deviation index is: ; in, is the power deviation index, is the actual measured heating power, is the heating power required by the design. It should be noted that The lower the value, the smaller the power deviation. The closer it is to 0%, the closer the actual heating power is to the design heating power, and the smaller the power deviation is; Furthermore, the expression for the reading accuracy index is: ; in, is the reading accuracy index, is the set temperature value, is the temperature value measured by the sensor, is the temperature range of the test, is the number of tests. It should be noted that The lower the value, the more accurate the reading. The closer it is to 0%, the closer the temperature value measured by the sensor is to the set temperature value, and the higher the reading accuracy; The expression for the error range index is: ; in, is the margin of error index, is the temperature value measured by the sensor, is the standard temperature value, is the temperature range of the test. It should be noted that The lower the value, the smaller the error range. The closer it is to 0%, the smaller the deviation between the temperature value measured by the sensor and the actual or standard temperature value, and the smaller the error range; The expression of air volume index is: ; in, is the air volume index, the actual measured air volume, and the air volume required by the design. It should be noted that The closer it is to 100%, the closer the air volume is to the design requirements. The higher it is, the closer the actual measured air volume is to the design required air volume, and the better the performance; The expression of power index is: ; in, is the power index, is the actual measured power, is the maximum power of this type of fan motor. It should be noted that The closer to 100%, the higher the power. The higher it is, the closer the actual measured power is to the theoretical maximum power of this type of fan motor, and the better the performance; The expression of noise level index is: ; in, is the noise level index, is the actual measured noise decibel value, It is to limit the noise decibel value. It should be noted that if , indicating that the actual noise level is lower than the limit value, The smaller it is, the lower the actual measured noise level is and the better the performance is. In addition, the evaluation process of the abnormality degree of each detection indicator is as follows: The damper detection abnormality evaluation index is generated according to the adjustment accuracy index and the response time index to evaluate the abnormality of the damper detection. The expression of the damper detection abnormality evaluation index is: ; in, is the damper detection abnormality evaluation index, It is the adjustment accuracy index, which indicates the degree of deviation between the actual opening angle of the damper and the target angle. It is the response time index, which indicates the deviation between the time required for the damper to reach the specified position after receiving the command and the expected time. is the preset threshold of the adjustment accuracy index, is the preset threshold of the response time index. It should be noted that The closer the value is to 0%, the more normal the damper detection is. The larger the value of, the higher the degree of abnormality; The electric heating detection abnormality evaluation index is generated by combining the heating speed index and the power deviation index to evaluate the abnormality degree of the electric heating detection. The expression of the abnormality degree of the electric heating detection is: ; in, is the electric heating detection abnormality evaluation index, It is the heating speed index, which indicates the ratio of the time required for an electric heating element to reach a specific temperature from start-up to the expected time. is the power deviation index, which indicates the deviation between the actual heating power and the rated heating power. is the acceptable deviation range of the heating rate index, taking the absolute value corresponding to ±5%, is the preset threshold of the power deviation index, is the scaling factor used to convert The value is adjusted to a specific range. It should be noted that The smaller the value, the more normal the electric heating detection is. The larger the value of, the higher the degree of abnormality; The temperature sensor detection anomaly evaluation index is generated by combining the reading accuracy index and the error range index to evaluate the degree of temperature sensor detection anomaly. The expression of the temperature sensor detection anomaly evaluation index is: ; in, is the temperature sensor detection abnormality evaluation index, It is the reading accuracy index, which indicates the degree of deviation between the temperature sensor reading and the actual temperature. is the error range index, which indicates the maximum deviation of the sensor reading within a certain period of time. is the preset threshold value of the reading accuracy index, is the preset threshold of the error range index. It should be noted that The closer the value is to 0%, the more accurate the temperature sensor detection is. The larger the value of, the higher the degree of abnormality; Based on the air volume index, power index and noise level index, a fan motor detection abnormality evaluation index is generated to evaluate the degree of abnormality of the fan motor detection. The expression of the fan motor detection abnormality evaluation index is: ; in, is the fan motor detection abnormality evaluation index, It is the air volume index, which indicates the ratio of the actual air volume generated by the fan motor to the expected air volume. is the power index, which indicates the power of the fan motor in converting electrical energy into wind energy. It is the noise level index, which indicates the noise intensity when the fan motor is running. is the preset threshold value of the air volume index, is the preset threshold of the power index, is the preset threshold of the noise level index. It should be noted that The closer the value is to 0%, the more normal the fan motor detection is. The larger the value, the greater the abnormality in air volume, power or noise; According to the collected detection data, the damper detection abnormality evaluation index, the electric heating detection abnormality evaluation index, the temperature sensor detection abnormality evaluation index and the fan motor detection abnormality evaluation index are calculated to evaluate the abnormal state of each detection item respectively; Step 4: According to the analysis results, determine whether the function of the air conditioner indoor unit is qualified, and make corresponding display prompts to prompt the inspection personnel to proceed to the next step, calculate the abnormal evaluation index of all test items, determine whether each test item is qualified, and make corresponding prompts. If the function of the air conditioner indoor unit is qualified, a qualified prompt is issued, and a prompt message of "the function test of the air conditioner indoor unit is qualified" is displayed, accompanied by a green indicator light to indicate that everything is normal; if the function of the air conditioner indoor unit is unqualified, an unqualified prompt is issued, and a prompt message of "the function test of the air conditioner indoor unit is unqualified" is displayed, and the abnormal test items are listed in detail, accompanied by a red indicator light. For qualified air conditioners, the inspection personnel are prompted to record the test results and proceed to the next step of assembly, packaging and delivery process; for unqualified air conditioners, the unqualified test items and their abnormality are listed, and the inspection personnel are guided to further analyze the cause of the problem, re-check the installation of related components, adjust parameter settings, and perform troubleshooting, and re-inspect until all test items meet the qualified standards, record all test data and evaluation results, and generate corresponding test reports for archiving and storage.
[0012] Embodiment 2, as Figure 3 As shown, on the basis of Example 1, the present invention further provides a variable frequency air conditioner indoor unit testing system, which is used to implement a variable frequency air conditioner indoor unit testing method, including a testing platform, the testing platform is communicatively connected with a power module, a communication module, an embedded control module, a sensor module, a detection module, a data analysis and judgment module, an abnormality assessment module, a prompt module and a report generation module, wherein the electrical signals between the modules are connected; The power module is used to provide power so that the test equipment can work normally under the specified voltage and current to avoid power supply problems affecting the test results; The communication module is responsible for data transmission between the test system and the air conditioner indoor unit, realizing real-time and accurate data transmission and ensuring reliable exchange of test instructions and test data; Embedded control module, used to simulate the actual operating environment of the air conditioner in combination with the single-chip microcomputer, control the test process, and simulate the performance of the air conditioner in actual use by accurately controlling the test conditions, thereby improving the accuracy and reliability of the test; The sensor module is used to collect various physical quantity information during the operation of the air conditioner, including temperature, humidity, and wind speed. Through high-precision sensors, the operating status data of the air conditioner can be obtained in real time and accurately, providing a reliable basis for subsequent data analysis and evaluation; A detection module is used to detect the functions of the damper, electric heater, temperature sensor and fan motor of the air conditioner indoor unit; The detection module includes a damper detection unit, an electric heating detection unit, a temperature sensor detection unit and a fan motor detection unit; The damper detection unit is used to detect the opening and closing state and response speed of the damper, evaluate the accuracy and response time of damper adjustment, and ensure that the damper can correctly adjust the wind direction and air volume; The electric heating detection unit is used to detect the working status and heating power of the electric heating element, and to evaluate whether the electric heating function is normal, and whether the heating speed and stable temperature meet the standards.
[0013] The temperature sensor detection unit is used to detect the reading accuracy and response time of the temperature sensor to ensure that the temperature sensor can accurately measure the ambient temperature and provide reliable data for air conditioning control; The fan motor detection unit is used to detect the start, run and stop status of the fan motor, evaluate the air volume, power and noise level, and ensure that the fan motor can provide sufficient air volume and appropriate wind speed while maintaining low noise and high power; The data analysis and judgment module is used to collect data from the detection module, analyze it, generate performance indicators, compare it with preset thresholds, determine whether the various functions of the air conditioner indoor unit are normal, and generate test results; The abnormality assessment module is used to analyze and evaluate the status of the air conditioner indoor unit according to the collected data and the preset assessment criteria, determine the degree of abnormality of the air conditioner indoor unit, promptly discover the problems existing in the air conditioner indoor unit, and provide guidance for subsequent troubleshooting and maintenance; The prompt module is used to intuitively display the test results and abnormal information to the inspectors, so that the inspectors can understand the test results and abnormal information of the air conditioner indoor unit, which is convenient for the next work arrangement and decision-making; The report generation module is used to generate a test report containing all test data and results, providing managers and technicians with detailed test records to facilitate subsequent analysis and decision-making.
[0014] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A method for testing an indoor unit of a variable frequency air conditioner, characterized in that: The following steps are involved: Step 1: Power on the test system correctly, enter the standby state, and perform a system self-check, using a single-chip microcomputer and embedded control software to simulate the actual operating environment of the air conditioner; Step 2: Turn on the power of the air conditioner indoor unit, send an automatic detection control command to the air conditioner indoor unit, enter the test mode, start the detection, detect the working status of the damper, electric heating, sensor, and fan motor in turn, record relevant data and evaluate key performance indicators; Step 3, collect various detected data, and send the collected data to the test system through the communication module for analysis, and preset thresholds to determine whether various functions of the air conditioner indoor unit are normal; Step 4: Based on the analysis results, determine whether the air conditioner indoor unit functions properly and make corresponding display prompts to prompt the inspector to proceed to the next step.
2. A method for testing an indoor unit of a variable frequency air conditioner according to claim 1, characterized in that: In step 1, the process of simulating the actual operating environment of the air conditioner is as follows: Step 101, check that the power supply of the hardware equipment of the test system is correctly connected, the power supply is stable, and check the power supply line; Step 102, start the test system, make it enter the power-on sequence, and start to execute the power-on self-test program, and automatically perform hardware self-test; Step 103, after the self-test is completed, the device enters a standby state and waits for a signal to start the test; Step 104, configuring the parameters of the single-chip microcomputer and the embedded control software according to the test requirements, and using the single-chip microcomputer and the embedded software to simulate the operating conditions and environmental factors of the air conditioner, wherein the environmental factors include temperature, humidity, and wind speed; Step 105, analyzing the communication connection status between the test system and the single-chip microcomputer, determining whether the communication connection is normal, and verifying whether the control logic in the single-chip microcomputer and the embedded software is correct, and determining whether the start-up, operation and shutdown process of the air conditioner can be correctly simulated; Step 106, run the test program in the simulation environment to check whether the test system can correctly respond to the control command, simulate the normal working state of the air conditioner, confirm that all simulation environments and control logics are ready, and prepare to conduct actual testing on the air conditioner indoor unit.
3. A method for testing an indoor unit of a variable frequency air conditioner according to claim 2, characterized in that: In step 2, the evaluation process of the key performance indicators is as follows: Step 201, turning on the power supply of the indoor unit of the air conditioner, and performing a safety check at the same time. After the power supply line is checked and found to be correct, the power supply of the indoor unit of the air conditioner is turned on, the unit enters the standby state, and confirms that the power supply is turned on and the device is in the standby state; Step 202: The test system sends an automatic detection control command to the air conditioner indoor unit through the established communication connection. After receiving the control command, the air conditioner indoor unit enters the test mode and prepares to start various tests. Step 203, the air conditioner indoor unit simulates actual operating conditions to detect the performance and stability of each component, and sequentially detects the working status of the damper, electric heater, sensor, and fan motor; Step 204, send a control command to open and close the damper, detect the opening and closing state and response speed of the damper, and record the key performance indicators of the opening angle of the damper at different positions and the damper response time; send a command to start electric heating, perform a functional test on the electric heating element, use a temperature sensor to detect the temperature change in the electric heating area, and record the key performance indicators of the heating speed and stable temperature value; test the temperature sensors one by one, check whether the sensor readings are accurate by simulating different temperature environments, and record the key performance indicators of the sensor response time and error range; send a control command to start the fan motor and run it at different speeds, observe the rotation of the fan, check whether there are abnormal sounds, vibrations or unstable speeds, use an anemometer to measure the air volume and speed of the fan at different speeds, record relevant data, and evaluate the key performance indicators of the fan motor's output power, power and noise level.
4. A method for testing an indoor unit of a variable frequency air conditioner according to claim 3, characterized in that: In step 3, the process of determining whether the functions of the air conditioner indoor unit are normal is as follows: Step 301, summarizing the detected data, and sending the collected data of key performance indicators of each component to the test system through the communication module for analysis; Step 302, preset the judgment thresholds of the damper detection, electric heating detection, temperature sensor detection and fan motor detection, which are respectively the damper opening angle error threshold, response time threshold, heating speed threshold, stable temperature deviation threshold, power deviation threshold, temperature sensor reading accuracy threshold, sensor response time threshold, error range threshold, air volume deviation threshold, power threshold and noise level threshold; Step 303, extracting the key performance indicator data of the opening angle and response time of the damper detection, obtaining the adjustment accuracy index and the response time index, and comparing them with the preset judgment threshold value. If they are within the range of the normal threshold value, it is judged that the damper function is normal, otherwise, the abnormality is recorded and marked as unqualified; Step 304, extracting the key performance indicator data of the heating speed and stable temperature value detected by the electric heating, obtaining the heating speed index and the power deviation index, and checking whether the stable temperature meets the standard, and comparing it with the preset judgment threshold. If it is within the range of the normal threshold, it is judged that the electric heating function is normal, otherwise, it is recorded as abnormal and marked as unqualified; Step 305, extract the key performance indicator data of the response time and error range of the temperature sensor detection, obtain the reading accuracy index and the error range index, and compare them with the preset judgment threshold. If they are within the normal threshold range, it is judged that the temperature sensor functions normally, otherwise, the abnormality is recorded and marked as unqualified; Step 306, extracting the key performance indicator data of the air volume, power and noise level detected by the fan motor, obtaining the air volume index, power index and noise level index, and comparing them with the preset judgment thresholds. If they are within the range of the normal threshold, it is judged that the fan motor functions normally, otherwise, the abnormality is recorded and marked as unqualified; Step 307 , comprehensively analyzing the key performance indicator data of the air door detection, electric heating detection, temperature sensor detection, and fan motor detection, and analyzing the abnormality of each detection indicator.
5. A method for testing an indoor unit of a variable frequency air conditioner according to claim 4, characterized in that: The expression of the adjustment accuracy index is: ； in, is the regulation accuracy index, is the set opening angle, is the actual measured opening angle, is the maximum opening angle of the damper, is the number of tests; The expression of the response time index is: ； in, is the response time index, is the actual response time, is the target response time threshold; The expression of the heating rate index is: ； in, is the heating rate index, is the stable temperature, is the initial temperature, It is the time required from the start of heating to reaching a stable temperature; The expression of the power deviation index is: ； in, is the power deviation index, is the actual measured heating power, It is the heating power required by the design.
6. A method for testing an indoor unit of a variable frequency air conditioner according to claim 5, characterized in that: The expression of the reading accuracy index is: ； in, is the reading accuracy index, is the set temperature value, is the temperature value measured by the sensor, is the temperature range of the test, is the number of tests; The expression of the error range index is: ； in, is the margin of error index, is the temperature value measured by the sensor, is the standard temperature value, is the temperature range of the test; The expression of the air volume index is: ； in, is the air volume index, is the actual measured air volume, is the air volume required by the design; The expression of the power index is: ； in, is the power index, is the actual measured power, is the maximum power of this type of fan motor; The expression of the noise level index is: ； in, is the noise level index, is the actual measured noise decibel value, It is to limit the noise decibel value.
7. A method for testing an indoor unit of a variable frequency air conditioner according to claim 6, characterized in that: The evaluation process of the abnormality degree of each detection index is as follows: Step 3071, generating a damper detection abnormality evaluation index according to the adjustment accuracy index and the response time index, and evaluating the abnormality degree of the damper detection; Step 3072, combining the heating speed index and the power deviation index to generate an electric heating detection abnormality evaluation index, and evaluating the degree of abnormality of the electric heating detection; Step 3073, combining the reading accuracy index and the error range index to generate a temperature sensor detection abnormality evaluation index to evaluate the degree of temperature sensor detection abnormality; Step 3074, generating a fan motor detection abnormality evaluation index based on the air volume index, the power index, and the noise level index, and evaluating the degree of abnormality of the fan motor detection; Step 3075, based on the collected detection data, calculate the damper detection abnormality evaluation index, the electric heating detection abnormality evaluation index, the temperature sensor detection abnormality evaluation index and the fan motor detection abnormality evaluation index, and evaluate the abnormal state of each detection item respectively.
8. A method for testing an indoor unit of a variable frequency air conditioner according to claim 7, characterized in that: In step 4, the process of displaying the prompt is as follows: Step 401, calculate the abnormal evaluation index of all test items, determine whether each test item is qualified, and give corresponding prompts; Step 402: If the air conditioner indoor unit function is qualified, a qualified prompt is issued, and a prompt message "air conditioner indoor unit function test is qualified" is displayed, accompanied by a green indicator light to indicate that everything is normal; if the air conditioner indoor unit function is unqualified, an unqualified prompt is issued, and a prompt message "air conditioner indoor unit function test is unqualified" is displayed, and abnormal detection items are listed in detail, accompanied by a red indicator light; Step 403, for qualified air conditioner indoor units, the inspector is prompted to record the test results and proceed to the next step of the process; for unqualified air conditioner indoor units, the unqualified test items and their abnormality levels are listed, and the inspector is guided to further analyze the cause of the problem, recheck the installation of relevant components, adjust parameter settings, and perform troubleshooting, and re-inspect until all test items meet the qualified standards; Step 404, record all test data and evaluation results, and generate a corresponding test report for archival storage.
9. A variable frequency air conditioner indoor unit testing system, used to implement a variable frequency air conditioner indoor unit testing method according to any one of claims 1 to 8, comprising a testing platform, characterized in that: The test platform is communicatively connected with a power module, a communication module, an embedded control module, a sensor module, a detection module, a data analysis and judgment module, an abnormality assessment module, a prompt module and a report generation module, wherein electrical signals are connected between the modules; The power supply module is used to provide power so that the test equipment can work normally under the specified voltage and current; The communication module is used to transmit data between the test system and the air conditioner indoor unit; The embedded control module is used to simulate the actual operating environment of the air conditioner in combination with the single-chip microcomputer to control the test process; The sensor module is used to collect various physical quantity information during the operation of the air conditioner, including temperature, humidity, and wind speed; The detection module is used to detect the functions of the damper, electric heater, temperature sensor and fan motor of the air conditioner indoor unit; The data analysis and judgment module is used to collect data from the detection module, analyze it, generate performance indicators, compare it with preset thresholds, determine whether various functions of the air conditioner indoor unit are normal, and generate test results; The abnormality assessment module is used to analyze and assess the status of the air conditioner indoor unit according to the collected data and the preset assessment criteria, and determine the degree of abnormality of the air conditioner indoor unit; The prompt module is used to intuitively display the test results and abnormal information to the inspector, so that the inspector can understand the test results and abnormal information of the air conditioner indoor unit; The report generation module is used to generate a test report containing all test data and results.
10. The variable frequency air conditioner indoor unit testing system according to claim 9, characterized in that: The detection module includes a damper detection unit, an electric heating detection unit, a temperature sensor detection unit and a fan motor detection unit; Wherein, the damper detection unit is used to detect the opening and closing state and response speed of the damper, and evaluate the accuracy and response time of damper adjustment; The electric heating detection unit is used to detect the working state and heating power of the electric heating element, and evaluate whether the electric heating function is normal, and whether the heating speed and stable temperature meet the standards; The temperature sensor detection unit is used to detect the reading accuracy and response time of the temperature sensor to ensure that the temperature sensor can accurately measure the ambient temperature; The fan motor detection unit is used to detect the start, operation and stop status of the fan motor and evaluate the air volume, power and noise level.