QC/T 1004-2015Performance requirements and bench test methods for automotive electric vacuum pumps (English PDF)

3.1 Electric vacuum pump

5.1 Test apparatus

5.1.1 Test apparatus used for test shall be as specified for related test items; they shall not have adverse effects on the function of test sample.

5.1.2 The accuracy of instruments and meters for measuring and indicating all parameters in durability test shall not be lower than grade 2.0.

5.1.3 The temperature control error of high-temperature and low-temperature test apparatus shall be ± 2°C.

5.1.4 Salt spray test chamber shall be as specified in GB/T 10587.

5.1.5 Vibration test apparatus shall have sweep frequency function.

5.2 Test conditions

Unless specified otherwise, all tests shall be carried out under the following conditions.

a) the environmental temperature shall be 20°C ± 2°C;

b) the relative humidity shall not be greater than 95%;

c) the environmental atmospheric pressure shall not be lower than 98 kPa;

d) the motor working voltage shall be rated voltage;

e) the test volume shall be decided in accordance with vacuum tank equipped in vehicles or as agreed on by the supplier and the purchaser.

5.3 Test items and sample requirements

The corresponding relationships between test samples and test items are preferably selected based on Table 2, based on different test objectives.

6.3 Vibration durability

6.3.1 Mount test sample on vibration test bench through fixture in accordance with the actual installation condition on a vehicle; connect relevant pipes and circuits as specified in product specifications.

6.3.2 Start vibration test bench to carry out sweep frequency test at 33.3 Hz ~ 66.7 Hz along the vertical direction at the acceleration of 43 m/s²; the sweep frequency cycle is 15 min and the test duration 40 h. Meanwhile, electric vacuum pump operates under the normal-temperature durability test conditions specified in Table 3.

6.3.3 Carry out basic performance retest at normal temperature in accordance with 6.1.2.1 after test; dismantle sample if necessary; record the damages of sample.

6.4 Corrosion resistance

Place sample into salt spray test chamber after sealing the evacuation opening of sample; carry out continuous salt spray test for 144 h (96 h for galvanized parts) in accordance with the requirements for neutral salt spray test specified in GB/T 10125-1997. Use clean water of temperature not higher than 40°C for washing to remove the salt deposit on the sample surface after test; then blow air for drying within 2 min; examine and record the corrosion of the surface protective layer.

6.5 Liquid consumption

6.5.1 At the filling opening of electric vacuum pump liquid reservoir, use an adapter to connect with a graduated measuring container. The minimum resolution of the container is preferably 1 mL. Add liquid medium specified in product specifications to electric vacuum pump through measuring container. The amount added shall ensure the measurement of liquid consumption; meanwhile, it shall not influence the normal operation of electric vacuum pump. When the two are contradictory, an alternative method shall be used for test.

6.5.2 Mount sample on test bench as specified in 6.1.2.1. […]