T/CSAE 148-2020Road evaluation automotive thermal management performance - Powertrain cooling and thermal protection test method (English PDF)

5.1 Performance requirements

The road test should be used to complete the powertrain cooling and air conditioning cooling test in the environmental wind tunnel, and complete the simple dynamic test on the performance road.

And complete the rectification of related problems at the current stage; or use another vehicle with the same technical status to ensure that the test vehicle is cooled, the cooling and power of the air conditioner meet the design requirements of the current stage. In order to quickly find the cause of unexpected situations during the road test and the solution to the problem.

5.2 Status check

5.2.1 Confirm that the state of the vehicle meets the design requirements of the current stage, and record the basic information of the vehicle in the vehicle information table (see Table A.1), Including relevant information such as the vehicle, engine, gearbox, cooling system, etc.

5.2.2 If the vehicle is in a new offline state, the vehicle should be run-in in accordance with GB/T 12534, and the run-in mileage should be at least 3000 km. Special case Under, you can select a vehicle with a mileage of more than 1000 km. If the vehicle is not in the new offline state, the vehicle maintenance record needs to be checked, and the last time the vehicle is maintained If the mileage after maintenance exceeds 5000 km, the coolant, engine oil, gearbox oil, other parts and oil should be replaced.

Follow the regulations in the vehicle instruction manual.

5.2.3 The vehicle should be equipped with a front license plate or a cover plate equal in size to the front license plate.

5.2.4 The cold inflation pressure of vehicle tires should meet the requirements of the vehicle instruction manual, and the error should not exceed ±10 kPa. Front tires of front-wheel drive vehicles the pressure increases by 0.1 bar, and the rear tire pressure of the rear-wheel drive vehicle increases by 0.1 bar. It is recommended to add nitrogen to the tires to stabilize the tire pressure.

5.2.5 Test accessories include engine coolant, engine lubricating oil, transmission lubricating oil and transaxle lubricating oil, which must meet the requirements of the engine, Gearbox and other design requirements, and fill in accordance with the vehicle manual or add to the specified filling amount.

5.2.6 The charge of refrigerant should meet the requirements without leakage.

5.2.7 The test vehicle should be loaded according to the full load of the vehicle. After loading, the height of the front and rear wheel eyebrows above the ground needs to be measured and recorded in the vehicle information

Table (see Table A.1).

5.3 Sensor installation

According to the vehicle structure and principle, select the measuring point and install the sensor in accordance with the provisions of Table B.1.

6.1 Data collection

Connect each sensor and data acquisition equipment, check each acquisition signal, and start the data acquisition system after ensuring that it is normal, and start recording data.

6.2 Pretreatment

6.2.1 The test personnel enter the vehicle and drive the vehicle.

6.2.2 Fully preheat the vehicle before the start of each test condition, and drive on the road near the starting point at a speed of 70-100 kph for 15 minutes or wait for the vehicle cooling fan to automatically run at least twice in accordance with the water temperature control logic. For the test road, refer to the road requirements in Appendix C.

6.3 Test process and placement

After the pretreatment is completed, drive from the starting point to the end point according to the requirements of the test road path.

The vehicle speed meets the average vehicle speed target requirements in Table 2.After reaching the end point, drive within 1 minute to the pre-selected cover, the position in front of the car and the cover the distance of the barrier is required to be less than 1±0.2 m, the front of the car is stopped in the leeward direction, and the temperature of each measuring point begins to drop to 10-15 minutes, and the test ends only.

6.4 Test road

The road test site and driving route are shown in Table 2, including. test road name, best test season, target thermal environment, minimum allowable heat Environment and evaluation content.

Table 2 Road test site and driving route

6.5 Air conditioning settings

The air conditioning setting requirements are as follows.

--Mode setting. all cold-blown noodles;

--Temperature setting. lowest;

--Blower setting. the most high-end;

--Air outlet grille. the position of the largest air outlet cross-sectional area;

- Rear air duct (if any). open;

--Air intake mode. The intake air is placed in the outer circulation position. For automatic air conditioners whose intake mode cannot be adjusted manually, if the initial state is internal circulation Loop mode, the set temperature can be increased by 1 °C each time until it is converted to the outer loop mode; but if the test process If the automatic air conditioner automatically converts to the internal circulation, the internal circulation is adopted;

--Compressor. On.

6.6 Transmission gear selection

6.6.1 For vehicles equipped with automatic transmission, the gear position is automatically determined by the transmission, but if a gear search occurs (i.e. 1 km driving distance) There are more than 4 gear changes in the middle), you can consider locking it in a lower gear manually.

6.6.2 For vehicles equipped with manual transmissions, the gear that is most likely to meet the vehicle speed requirements should be selected. On this basis. if there are two gears If the gears may meet the vehicle speed requirements, for models equipped with turbocharged engines, a higher gear or a smaller gear ratio should be selected; and for for models equipped with a naturally aspirated engine, a lower or larger gear ratio should be selected on the premise that the engine speed requirements in Table 3 are met.

Table 3 Maximum engine speed