T/CSAE 145-2020Air conditioning system maximum cooling performance test procedure for passenger vehicle (English PDF)

4.1 Test environment

The test wind tunnel meets the requirements of Chapter 4 in the T/CSAE 114-2019 Environmental Wind Tunnel Test Method for the Cooling Capacity of Automotive Powertrains.

4.2 Test prototype

4.2.1 The test vehicle should meet the technical requirements of the vehicle as required by the manufacturer. The airtightness of the vehicle, the amount of refrigerant filling, leakage and evaporation should be confirmed the anti-frosting of the vehicle should meet the technical requirements of the vehicle, and the basic information of the vehicle should be recorded, including the vehicle, engine, gearbox, cooling system, etc.

information.

4.2.2 A new car is recommended for the vehicle. The exterior color of the vehicle is recommended to be dark, not white.

5.4 Test condition 2-general cooling

5.4.1 The test conditions maintain the ambient temperature, relative humidity and sunshine intensity of the preheating stage 3 in Table 2.

5.4.2 When the average temperature in the passenger compartment meets the requirements, the driver must enter the vehicle quickly and increase the vehicle speed to 50 km/h as quickly as possible.

After the vehicle speed stabilizes, adjust the blower to the maximum gear, and the air conditioning system setting status is shown in Table 4.

5.4.3 When the test starts timing, press the AC button at the same time. The test conditions are carried out in accordance with Table 4 and meet the following requirements.

a) When the vehicle speed is 50 km/h, priority should be given to the engine speed. Reasonable range of engine speed. the best speed is 1650 rpm, If the optimal speed is not reached, it can be between 1500 and 1800 rpm, but not less than 1500 rpm;

b) For manual gearbox models. manually select a reasonable gear to keep the engine speed within a reasonable range;

c) For automatic transmission models with manual mode. if the speed is lower than 1500 rpm in D gear, manual mode can be used to select a reasonable gear to maintain the engine speed within a reasonable range;

d) For automatic gearbox models without manual mode. if the speed is lower than 1500 rpm in the D gear, the vehicle speed can be changed, but the headwind speed it needs to be maintained at 50 km/h. Vehicle speed selection requirements. the best vehicle speed is selected as the D gear and the vehicle speed when the engine speed is 1650 rpm, If it cannot be satisfied, select the D gear and the vehicle speed when the engine speed is between 1500 and 1800 rpm.

5.5 Test condition 3-immersion to idle

5.5.1 The test conditions maintain the ambient temperature, relative humidity and solar radiation intensity in the preheating stage 3 in Table 2.

5.5.2 When the average temperature in the passenger compartment reaches the requirements, the driver must enter the car quickly, start the engine as quickly as possible, and turn the blower Adjust to the maximum gear, and the air conditioning system is set to full cooling, internal circulation, and surface blowing mode.

5.5.3 When the test starts timing, press the AC button at the same time and hold it for 30 minutes, then the test ends.

5.6 Other requirements during preheating and test phase

5.6.1 When an auxiliary cooling system such as a rear evaporator and auxiliary evaporator is equipped, the operation and design of the auxiliary cooling system during the warm-up phase and the test phase are Set in accordance with the settings of the front air conditioner.

5.6.2 Models with rear exhaust air vents also need to be adjusted to the mode with the largest air volume and the lowest temperature.

5.6.3 Seat heating, various glass heating systems (such as rear defrost heating wire, etc.), various auxiliary heating systems and other devices with heating functions the device needs to be kept closed during the entire test.

5.6.4 Average temperature inside the car = (average temperature of all head measurement points in the first two rows, average temperature of all foot measurement points in the first two rows)/2.Among them, the head and the feet are the average of 8 temperature points.

5.6.5 For vehicles with more than two rows of seats, the average temperature inside the vehicle is calculated based on the first two rows.

5.7 Test record

From the beginning of the vehicle warm-up preparation stage to the end of the test, record the parameters of each sensor and equipment; the recommended data collection frequency is 1 s.