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QC/T 950-2019 English PDF (QCT950-2019)

QC/T 950-2019 English PDF (QCT950-2019)

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QC/T 950-2019: Performance requirement and test of heating car cushion
This standard specifies the terms and definitions, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for heating car cushion. This standard applies to heating cushion for car seats, which have a 12V or 24V voltage systems.
QC/T 950-2019
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 26
Replacing QC/T 950-2013
Performance requirement and test of heating car
cushion
ISSUED ON: NOVEMBER 11, 2019
IMPLEMENTED ON: APRIL 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 7
1 Scope ... 9
2 Normative references ... 9
3 Terms and definitions ... 10
4 Requirements ... 11
5 Test method ... 15
6 Inspection rules ... 22
7 Identification, packaging, transportation and storage ... 24
Performance requirement and test of heating car
cushion
1 Scope
This standard specifies the terms and definitions, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for heating car cushion.
This standard applies to heating cushion for car seats, which have a 12V or 24V voltage systems.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard.
GB/T 2423.1 Environmental testing - Part 2: Test methods - Tests A: Cold GB/T 2423.2 Environmental testing - Part 2: Test methods - Tests B: Dry heat GB/T 2423.3 Environmental testing - Part 2: Testing method - Test Cab:
Damp heat, steady state
GB/T 2423.22 Environmental testing - Part 2: Tests methods - Test N:
Change of temperature
GB 8410 Flammability of automotive interior materials
GB/T 30512 Requirements for prohibited substances on automobiles
QC/T 413 Basic technical requirements for automotive electric equipment QC/T 740 Seat assembly of passenger car
QC/T 29106 Technical specification of automobile wire harness
SAE J826 Specifications for the mechanical and design tools for H point 3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Seat heating
A car electric heating product assembly, which is installed in the interior of the car seat, to make the seat surface generate a certain temperature rise, thereby causing the seat user (occupant) to have a comfortable temperature feeling.
3.2
Heating unit
A sub-assembly of the heating component of the seat heating cushion, which is mainly composed of electric heating materials and base materials.
3.3
Harness
A sub-assembly, which is composed of wires, connectors, terminals,
covering materials, etc.
3.4
Seat cushion
The component that supports the occupant's buttocks.
3.5
Seat back
The component that supports the back of the occupant.
3.6
Temperature control unit (TCU)
An electronic control device, which is used to control the working state of the seat heating cushion, under the guidance of the control mode of a bus or physical switch.
3.7
documents, which are approved by the prescribed procedures.
4.1.2 The deviation of resistance value of the seat heating cushion shall not exceed ±10% of the specified value.
4.1.3 The seat heating cushion shall be free of defects such as contamination, damage, cracking, wrinkles.
4.1.4 The seat heating cushion shall have a soft texture and a flat appearance. There shall be no foreign body feeling, after the seat is installed.
4.1.5 The harness of the seat heating cushion shall comply with the relevant requirements of QC/T 29106.
4.1.6 Prohibited substances in seat heating cushion shall comply with the relevant requirements of GB/T 30512.
4.1.7 Temperature range:
Operating temperature range: -40 °C ~ 65 °C.
Storage temperature range: -40 °C ~ 85 °C.
4.2 Performance requirements
4.2.1 Flame retardancy
The burning rate shall be less than or equal to 100 mm/min, wherein the passenger car's burning rate shall be less than or equal to 70 mm/min.
4.2.2 Insulation resistance
The insulation resistance shall be greater than or equal to 5.0 MΩ.
4.2.3 Low temperature storage performance
After testing according to 5.5, the product performance shall meet the
requirements of 4.1.2 and 4.1.3.
4.2.4 High temperature storage performance
After testing according to 5.6, the product performance shall meet the
requirements of 4.1.2 and 4.1.3.
4.2.5 Constant damp heat storage performance
After testing according to 5.7, the product performance shall meet the
requirements of 4.1.2 and 4.1.3.
4.2.6 Thermal shock performance
After testing according to 5.8, the product performance shall meet the
requirements of 4.1.2 and 4.1.3.
4.2.7 Heating rate performance
When the initial ambient temperature is 0 °C, turn on the heating mode to the highest gear. 5 minutes after the heating starts, the seat surface's temperature shall not be lower than 30 °C.
4.2.8 Saturation temperature performance
When the initial ambient temperature is 0 °C, turn on the heating mode to the highest gear. The temperature of the seat surface shall reach the saturation temperature, within 15 minutes. When the temperature is controlled by the automatic thermostat, the steady-state temperature of the seat surface, at each heating mode, shall be within the range of the set temperature ± 5 °C. When the temperature is controlled by the temperature control unit, the steady-state temperature of the seat surface, at each heating mode, shall be within the range of the set temperature ± 2 °C.
4.2.9 Thermal runaway performance
Short-circuit the temperature control unit or automatic thermostat. Let it work continuously for 2 hours at the rated voltage. The temperature, at any point on the seat surface, shall not exceed 85 °C. After the test, the seat assembly shall be free from ablation, burns, or other thermal damage. The seat heating cushion and surrounding components shall not fail.
4.2.10 Overvoltage performance
After testing according to 5.11, the seat assembly shall show no functional damage; the seat heating cushion and its surrounding components shall not be damaged. After returning to normal working conditions, the seat heating cushion shall function normally.
4.2.11 Thermal uniformity performance
When the heating temperature at each gear reaches a steady state, the
maximum temperature difference, BETWEEN each temperature measurement
point on the seat surface AND the set temperature value, shall not be greater than 5 °C.
4.2.12 Harness tensile strength performance
The strength at the connection, BETWEEN the forward wire of the harness 4.2.14 Simulated knee pressure performance
After 5000 tests at each test point in 5.15, the seat heating cushion shall be free from disconnection, short circuit, abnormal heating, leakage, falling off, damage to the covering layer, or various other failures. The product performance shall meet the requirements of 4.1.2.
4.2.15 Simulated road bumps and creep performance
After the seat cushion is subject to 100000 tests AND the seat back is subject to 50000 tests, according to 5.16, the seat heating cushion shall be free from disconnection, short circuit, abnormal heating, leakage, shedding, damage to the covering layer, or various other failures. The product performance shall comply with the requirements of 4.1.2.
4.2.16 Water and liquid resistance
After the test according to 5.17, the product performance shall meet the requirements of 4.1.2.
4.2.17 Adhesion performance
After the test according to 5.18, the foam body shall be peeled off, along with the fixing part of the seat heating cushion (only for sticking fixed seat heating cushion).
4.2.18 Flexural resistance
After the test according to 5.19, the resistance value of the seat heating cushion shall not change more than ±10%. The image detection is carried out by a thermal imager, there shall be no hot spots in the test area.
5 Test method
5.1 Test conditions
5.1.1 The test shall be carried out in an indoor environment; room temperature: 20 °C ± 5 °C.
5.1.2 Test voltage: 13.5V for 12V voltage system; 28V for 24V voltage system. 5.1.3 The requirements for instruments and meters are as follows:
a) For the electrical measuring instrument used in the test, it shall have a standard level of not less than level 0.5;
b) For the temperature measuring instrument used in the test, it has a
resolution not greater than 1 °C;
c) For the tensile measuring instrument used in the test, the error shall not be higher than ± 1%.
5.2 Routine inspection
5.2.1 Visual inspection: the appearance of the seat heating cushion is evaluated visually.
5.2.2 Basic parameter test: measure the resistance value of the seat heating cushion by a resistance tester.
5.3 Flame retardant performance test
The test method is carried out in accordance with the provisions of GB 8410. 5.4 Insulation resistance test
Connect the ground electrode (E) of the megohmmeter to the iron plate.
Connect the circuit electrode (L) to the terminal of the seat heating cushion's harness connector. Apply a DC 500V voltage, BETWEENs the terminal of the seat heating cushion's harness connector AND the iron plate. Measure and record the value of the insulation resistance.
5.5 Low temperature storage performance test
Continuously place it in a low temperature environment (-40 °C ± 5 °C) for 96 hours. The test shall be carried out in accordance with the method specified in GB/T 2423.1. Then place it at room temperature for 24 hours. Then connect the power supply, to observe its changes.
5.6 High temperature storage performance test
Continuously place it in a low temperature environment (85 °C ± 5 °C) for 96 hours. The test shall be carried out in accordance with the method specified in GB/T 2423.2. Then place it at room temperature for 24 hours. Then connect the power supply, to observe its changes.
5.7 Constant damp heat storage performance test
Place it in a constant damp heat environment (temperature: 40 °C ± 5 °C, relative humidity: 90% ~ 95%) continuously for 96 hours. The test shall be carried out, according to the method specified in GB/T 2423.3. Then place it at room temperature for 24 hours. Then connect the power supply, to observe its changes.
5.8 Thermal shock performance test
Table 1. The simulated false hips and false backs are in accordance with 50% of SAE J826's requirements for false hips and false backs. The turbulence amplitude (peak to peak) is 30 mm. During the test, the heating cushion adopts a time controller; it works cyclically for 3 min power-on and 4 min power-off. 5.17 Water and liquid resistance test
Water resistance: Lay the heating cushion flat in a plastic container. Cover the heating cushion with a non-woven fabric of about 2 mm. Pour 1.0 L of clean water, at the main heating zone of the heating unit, at a rate of 2.0 L/min. After standing for 24 hours at room temperature to dry, test the performance of the heating cushion.
Liquid resistance (liquid flooding test): Lay the heating cushion flat in a plastic container. Cover the heating cushion with a non-woven fabric of about 2 mm. Pour 200 mL of 5% NaCl aqueous solution (light brine) and cleaning solution, at the main heating zone of the heating unit, at a rate of 1.0 L/min. After standing for 24 hours at room temperature to dry, test the performance of the heating cushion.
5.18 Adhesion performance test
Paste and fix the seat heating cushion on the seat foam. Place a 42 kg seat soft counterweight load, which has a bottom area of 300 mm x 400 mm, along the center line of the seat cushion. After bearing pressure for 24 hours at room temperature, slowly peel off the heating cushion from the foam, at a speed of less than 50 mm/min. Test the adhesion force.
5.19 Flexural resistance test
At room temperature, measure the resistance of the seat heating cushion. After the measurement, fix the heating cushion on the test platform (the test platform is composed of drive, control equipment, movable horizontal sliding bench). When fixing, it must be ensured that a heating wire is arranged at the bending point position, meanwhile the number of bending points also depends on the heating area. See Figure 6 and Figure 7 for details. After fixing, the heating cushion is bent, at a frequency of 0.5 ~ 1 Hz; each bending point is subject to 50000 bending cycles. During each bending cycle, the heating cushion moves 50 mm horizontally along the sliding bench. After the test, measure the heating unit; use an infrared thermal imager to perform imaging detection of the heating cushion.
7 Identification, packaging, transportation and storage
7.1 Identification
Each set of products shall have model specifications, part numbers,
manufacturer names, markings, trademarks.
7.2 Packaging
7.2.1 It is packed in a plastic bag inside and a carton outside.
7.2.2 There shall be a product certificate on the product packaging box, which shall meet the following basic requirements:
a) Conclusion of inspection.
b) Product's inspection date, inspector's signature or seal (it can be indicated by inspector code).
7.2.3 The packaging box shall be manufactured in accordance with the
drawings and technical documents, which are approved by the prescribed
procedures.
7.2.4 The mark on the outside of the packing box shall meet the following basic requirements:
a) The marks of each part of the packaging box must comply with the
corresponding national or industry standards.
b) Product name, specification model, product quantity, date of exit-factory, manufacturer name, production address.
c) Box size (length x width x height).
7.3 Transportation
The seat heating cushion shall be protected from rain and squeezing, during transportation.
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