A vehicle blower air volume test method

Abstract

The present invention relates to a vehicle blower air volume testing method, comprising the following steps: S1, maintaining the vehicle air conditioner in an internal circulation state, turning off the blower, inputting fresh air into the passenger compartment using an external blower device, measuring the passenger compartment fresh air volume and the passenger compartment static pressure, and obtaining a mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure; S2, conducting a real vehicle test, maintaining the vehicle air conditioner in an external circulation state, turning on the blower, measuring the passenger compartment static pressure and the air conditioner outlet pressure difference, calculating the blower air volume in the external circulation state, and obtaining a mapping relationship between the blower air volume and the air conditioner outlet pressure difference; S3, conducting a real vehicle test, maintaining the vehicle air conditioner in an internal circulation state, turning on the blower, measuring the air conditioner outlet pressure difference, and calculating the blower air volume in the internal circulation state. The present invention can measure the blower air volume in both the external circulation state and the internal circulation state through real vehicle tests.

Description

Technical Field

[0001] The present invention relates to a vehicle, and in particular to a method for testing the air volume of a vehicle blower. Background Art

[0002] The blower is one of the important components of vehicle air conditioning. It is located in the vehicle air conditioning box and is usually a multi-blade centrifugal fan. Its function is to transport the air that has passed through the air conditioning box for heat exchange into the passenger compartment.

[0003] Air volume is a key metric for evaluating air conditioning system performance during vehicle development and benchmark testing. In the early stages of vehicle air conditioning system development, blower selection is primarily based on bench test data. However, the actual vehicle load environment is unknown, making it difficult to evaluate the blower's air volume performance in real-world conditions based solely on bench test data. Therefore, after completing the air conditioning system design and vehicle assembly, it is essential to test the blower's air volume characteristics in real-world conditions.

[0004] Existing methods for measuring blower airflow in real-world conditions determine it by mapping the fresh air volume into the passenger compartment and the static pressure. However, this method can only be used to measure the airflow of the blower in each gear position when the vehicle's air conditioning system is in external circulation mode. This is because in external circulation mode, the blower airflow is equal to the fresh air volume into the passenger compartment. In internal circulation mode, air circulates within the passenger compartment, and the fresh air volume into the passenger compartment is zero, and the static pressure in the passenger compartment is also always zero. Therefore, this method cannot be used to measure the blower airflow in this internal circulation mode.

[0005] In the internal circulation mode, the blower does not need to overcome the load of the external circulation flow path and the back pressure of the passenger compartment. Therefore, at the same gear, the internal circulation air volume is generally higher than the external circulation air volume, with the difference generally exceeding 10%. For energy conservation reasons, the internal circulation of air conditioners is used in many scenarios. Accurately measuring the actual air volume of the blower at each gear in the internal circulation mode is of great significance to the optimized design of the air conditioning system. Summary of the Invention

[0006] The purpose of the present invention is to provide a vehicle blower air volume testing method to test the air volume of the blower in the external circulation state and the internal circulation state.

[0007] A vehicle blower air volume testing method according to the present invention comprises the following steps:

[0008] S1. Conducting a real-vehicle test with the vehicle's air conditioning maintained in internal circulation mode and the blower turned off. Using an external blower, fresh air is introduced into the passenger compartment. The fresh air volume and static pressure in the passenger compartment are measured to obtain a mapping relationship between the fresh air volume and static pressure in the passenger compartment.

[0009] S2. Conduct a real-vehicle test with the vehicle's air conditioning in external circulation mode and the blower turned on. Measure the passenger compartment static pressure and the air conditioning outlet pressure difference. Combined with the mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure obtained in S1, calculate the blower volume in the external circulation mode and obtain a mapping relationship between the blower volume and the air conditioning outlet pressure difference.

[0010] S3. Conduct a real vehicle test. Keep the vehicle air conditioner in the internal circulation state, turn on the blower, measure the pressure difference at the air conditioner outlet, and calculate the blower air volume in the internal circulation state by combining the mapping relationship between the blower air volume and the air conditioner outlet pressure difference obtained in S2.

[0011] As a preferred solution, the S1 is specifically:

[0012] During actual vehicle testing, the vehicle air conditioner is kept in internal circulation state, the blower is turned off, and fresh air is input into the passenger compartment using an external blower. The fresh air volume in the passenger compartment is measured using an air flow meter, and the static pressure in the passenger compartment is measured using a static pressure sensor. A predetermined number of sets of associated data consisting of the fresh air volume in the passenger compartment and the static pressure in the passenger compartment are obtained, and the mapping relationship between the fresh air volume in the passenger compartment and the static pressure in the passenger compartment is determined based on the predetermined number of sets of associated data.

[0013] As a preferred solution, the mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure is determined by quadratic polynomial fitting, and the fitted formula is:

[0014]

[0015] In the formula P S_1 is the static pressure of the crew compartment, Q 1 is the fresh air volume for the passenger compartment, a 1 、 b 1 、 c 1 are fitting coefficients.

[0016] As a preferred solution, the S2 is specifically:

[0017] During a real vehicle test, the vehicle air conditioner is kept in an external circulation state and the passenger compartment is kept closed. A static pressure sensor is used to measure the static pressure of the passenger compartment, and another static pressure sensor is used to measure the pressure difference at the air conditioning outlet. The blower is turned on to collect the static pressure of the passenger compartment under different test conditions and at different air volume gears, as well as the pressure difference at the air conditioning outlet under different test conditions and at different air volume gears. Based on the collected passenger compartment static pressure and the mapping relationship between the passenger compartment fresh air volume obtained in S1 and the passenger compartment static pressure, the blower air volume under different test conditions and at different air volume gears is calculated. Combined with the collected pressure difference at the air conditioning outlet under different test conditions and at different air volume gears, a predetermined number of sets of associated data consisting of the blower air volume and the air conditioning outlet pressure difference are formed, and the mapping relationship between the blower air volume and the air conditioning outlet pressure difference is determined based on the predetermined number of sets of associated data.

[0018] As a preferred solution, the mapping relationship between the blower air volume and the air pressure difference at the air conditioner outlet is determined by quadratic polynomial fitting, and the fitted formula is:

[0019]

[0020] In the formula P S_2 is the air outlet pressure difference of the air conditioner, Q 2 is the blower air volume, a 2 , b 2 , c 2 are fitting coefficients.

[0021] As a preferred solution, S3 is specifically:

[0022] During a real vehicle test, the vehicle air conditioner maintains an internal circulation state, the passenger compartment is kept closed, and the static pressure sensor for measuring the pressure difference at the air conditioner outlet maintains the state in S2; the blower is turned on, and the air conditioner outlet pressure difference under different test conditions and different air volume gears is collected. Combined with the mapping relationship between the blower air volume and the air conditioner outlet pressure difference obtained in S2, the blower air volume under different test conditions and different air volume gears is calculated.

[0023] As a preferred solution, the test conditions of the blower include: face blowing mode, rear exhaust air flow mode, foot blowing mode and defrost mode.

[0024] The present invention first obtains the mapping relationship between the fresh air volume of the passenger compartment and the static pressure of the passenger compartment through an external blower device; then performs an external circulation air volume test experiment, and obtains the blower air volume corresponding to each gear of the blower in the external circulation state according to the obtained mapping relationship between the fresh air volume of the passenger compartment and the static pressure of the passenger compartment, and determines the mapping relationship between the blower air volume and the pressure difference of the air conditioning outlet; finally, performs an air conditioning internal circulation air volume test experiment, and obtains the blower air volume corresponding to each gear of the blower in the internal circulation state according to the obtained mapping relationship between the blower air volume and the pressure difference of the air conditioning outlet.

[0025] The present invention can accurately measure the blower air volume corresponding to each gear of the blower in the external circulation state through actual vehicle tests, and can also accurately measure the blower air volume corresponding to each gear of the blower in the internal circulation state through actual vehicle tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flowchart of a vehicle blower air volume testing method described in a specific embodiment;

[0027] Figure 2 Schematic diagram of the implementation of step S1 of a vehicle blower air volume testing method described in a specific embodiment;

[0028] Figure 3 Schematic diagram of the implementation of step S2 of a vehicle blower air volume testing method described in a specific embodiment;

[0029] Figure 4 Schematic diagram of the implementation of step S3 of a vehicle blower air volume testing method described in a specific embodiment. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] like Figure 1 The vehicle blower air volume test method shown in the figure first prepares a test vehicle and a blower to be tested, installs the blower on the test vehicle, and then performs the following steps:

[0032] S1. Blast test

[0033] like Figure 2 As shown, connect the external blower, air flow meter, and passenger compartment of the test vehicle in series, install a passenger compartment static pressure sensor in the passenger compartment, and close the doors and windows of the test vehicle to keep the passenger compartment sealed (if the external blower is connected to the passenger compartment through a window, close the other doors and windows to keep the passenger compartment sealed);

[0034] Conducting an actual vehicle test, maintaining the vehicle air conditioning of the test vehicle in an internal circulation state with the blower turned off, supplying fresh air to the passenger compartment using an external blower, measuring the fresh air volume in the passenger compartment using an air flow meter, measuring the passenger compartment static pressure using a passenger compartment static pressure sensor, obtaining a predetermined number of sets of correlation data consisting of the passenger compartment fresh air volume and the passenger compartment static pressure, and determining a mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure based on the predetermined number of sets of correlation data;

[0035] The mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure is determined by quadratic polynomial fitting, and the fitted formula is:

[0036]

[0037] In the formula P S_1 is the static pressure of the crew compartment, Q 1 is the fresh air volume for the passenger compartment, a 1 、 b 1 、 c 1 are fitting coefficients.

[0038] S2. Air conditioning external circulation air volume test

[0039] like Figure 3 As shown, a passenger compartment static pressure sensor and an air-conditioning outlet static pressure sensor are installed in the passenger compartment of the test vehicle, and the doors and windows of the test vehicle are closed to keep the passenger compartment closed;

[0040] Conducting an actual vehicle test, with the vehicle air conditioner in an external circulation state, measuring the static pressure of the passenger compartment using a passenger compartment static pressure sensor, and measuring the pressure difference at the air conditioner outlet using a static pressure sensor at the air conditioner outlet; turning on the blower, collecting the static pressure of the passenger compartment under different test conditions and at different air volume gears, and collecting the pressure difference at the air conditioner outlet under different test conditions and at different air volume gears; calculating the blower air volume under different test conditions and at different air volume gears based on the collected passenger compartment static pressures in combination with the mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure obtained in S1; and combining the collected pressure difference at the air conditioner outlet under different test conditions and at different air volume gears to form a predetermined number of sets of associated data consisting of the blower air volume and the pressure difference at the air conditioner outlet; and determining the mapping relationship between the blower air volume and the pressure difference at the air conditioner outlet based on the predetermined number of associated data;

[0041] The mapping relationship between the blower air volume and the air pressure difference at the air conditioner outlet is determined by quadratic polynomial fitting, and the fitted formula is:

[0042]

[0043] In the formulaP S_2 is the air outlet pressure difference of the air conditioner, Q 2 is the blower air volume, a 2 , b 2 , c 2 are fitting coefficients.

[0044] S3. Air conditioning internal circulation air volume test

[0045] like Figure 4 As shown, an air-conditioning outlet static pressure sensor is installed in the passenger compartment of the test vehicle, and the doors and windows of the test vehicle are closed to keep the passenger compartment closed. As a preferred embodiment, the air-conditioning outlet static pressure sensor can directly use the air-conditioning outlet static pressure sensor installed in S2, and the air-conditioning outlet static pressure sensor in S2 can be kept installed.

[0046] Conduct a real vehicle test, and keep the vehicle air conditioner in the internal circulation state; turn on the blower, collect the pressure difference of the air conditioner outlet under different test conditions and different air volume gears, and combine the mapping relationship between the blower air volume and the air conditioner outlet pressure difference obtained in S2 to calculate the blower air volume under different test conditions and different air volume gears.

[0047] In this embodiment, the test operating conditions of the blower include: face blowing mode, rear exhaust air flow mode, foot blowing mode and defrost mode.

[0048] In this embodiment, the installation method of the air-conditioning outlet static pressure sensor is as follows: the negative tube of the air-conditioning outlet static pressure sensor is placed inside the car, and the positive tube of the air-conditioning outlet static pressure sensor is inserted into an air outlet of the wheel air conditioner by at least 15 cm, and fixed on the air outlet grille to prevent shaking.

[0049] In this embodiment, the data detected by each sensor can be transmitted to a data acquisition system for analysis.

[0050] The present invention is tested based on the following principles:

[0051] The mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure in the blast test is equivalent to the mapping relationship between the blower air volume and the passenger compartment static pressure in the air conditioning external circulation air volume test;

[0052] The mapping relationship between the blower air volume and the air outlet pressure difference of the air conditioner in the air conditioning external circulation air volume test is equivalent to the mapping relationship between the blower air volume and the air outlet pressure difference of the air conditioner in the air conditioning internal circulation air volume test.

Claims

1. A vehicle blower air volume test method, characterized in that: The following steps are involved: S1. Conducting a real-vehicle test with the vehicle's air conditioning maintained in internal circulation mode and the blower turned off. Using an external blower, fresh air is introduced into the passenger compartment. The fresh air volume and static pressure in the passenger compartment are measured to obtain a mapping relationship between the fresh air volume and static pressure in the passenger compartment. S2. Conduct a real-vehicle test with the vehicle's air conditioning in external circulation mode and the blower turned on. Measure the passenger compartment static pressure and the air conditioning outlet pressure difference. Combined with the mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure obtained in S1, calculate the blower volume in the external circulation mode and obtain a mapping relationship between the blower volume and the air conditioning outlet pressure difference. S3. Conduct a real vehicle test, with the vehicle air conditioner in internal circulation mode, turn on the blower, and measure the pressure difference at the air conditioner outlet. Calculate the blower air volume in the internal circulation mode by combining the mapping relationship between the blower air volume and the air conditioner outlet pressure difference obtained in S2. The mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure is determined by quadratic polynomial fitting, and the fitted formula is: Where P S_1 is the static pressure of the passenger compartment, Q1 is the fresh air volume of the passenger compartment, a1, b1, c1 are all fitting coefficients; The mapping relationship between the blower air volume and the air pressure difference at the air conditioner outlet is determined by quadratic polynomial fitting, and the fitted formula is: Where P S_2 is the pressure difference of the air conditioning outlet, Q2 is the air volume of the blower, a2, b2, and c2 are all fitting coefficients.

2. The vehicle blower air volume testing method according to claim 1, characterized in that: The S1 is specifically: During actual vehicle testing, the vehicle air conditioner is kept in internal circulation state, the blower is turned off, and fresh air is input into the passenger compartment using an external blower. The fresh air volume in the passenger compartment is measured using an air flow meter, and the static pressure in the passenger compartment is measured using a static pressure sensor. A predetermined number of sets of associated data consisting of the fresh air volume in the passenger compartment and the static pressure in the passenger compartment are obtained, and the mapping relationship between the fresh air volume in the passenger compartment and the static pressure in the passenger compartment is determined based on the predetermined number of sets of associated data.

3. The vehicle blower air volume testing method according to claim 1, characterized in that: The S2 is specifically: During a real vehicle test, the vehicle's air conditioning was kept in external circulation mode and the passenger compartment was kept closed. One static pressure sensor was used to measure the static pressure in the passenger compartment, and another static pressure sensor was used to measure the pressure difference at the air conditioning outlet. Turn on the blower, collect passenger compartment static pressures under different test conditions and at different air volume settings, and collect the air conditioning outlet pressure differentials under different test conditions and at different air volume settings. Calculate the blower air volume under different test conditions and at different air volume settings based on the collected passenger compartment static pressures in combination with the mapping relationship between the passenger compartment fresh air volume and the passenger compartment static pressure obtained in S1. Combined with the collected air conditioning outlet pressure differentials under different test conditions and at different air volume settings, a predetermined number of sets of associated data consisting of the blower air volume and the air conditioning outlet pressure differential are formed. Determine the mapping relationship between the blower air volume and the air conditioning outlet pressure differential based on the predetermined number of sets of associated data.

4. The vehicle blower air volume testing method according to claim 3, characterized in that: The S3 is specifically: During a real vehicle test, the vehicle air conditioner maintains an internal circulation state, the passenger compartment is kept closed, and the static pressure sensor for measuring the pressure difference at the air conditioner outlet maintains the state in S2; the blower is turned on, and the air conditioner outlet pressure difference under different test conditions and different air volume gears is collected. Combined with the mapping relationship between the blower air volume and the air conditioner outlet pressure difference obtained in S2, the blower air volume under different test conditions and different air volume gears is calculated.

5. The vehicle blower air volume testing method according to claim 4, characterized in that: The test conditions of the blower include: face blowing mode, rear discharge air flow mode, foot blowing mode and defrost mode.

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