QC/T 1169-2022 English PDF (QCT1169-2022)

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QC/T 1169-2022: Liquid crystal instrument for automobile
QC/T 1169-2022
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
CCS T 35
Liquid crystal instrument for automobile
ISSUED ON: APRIL 08, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 6
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 8
4 Requirements ... 9
5 Test method ... 18
6 Inspection rules ... 23
7 Marking, packaging, storage, custody ... 25
Appendix A (Informative) Display symbols of instrument panel ... 26
Appendix B (Informative) Instrument connector diagram ... 27
Liquid crystal instrument for automobile
1 Scope
This document specifies the term, definitions, requirements, test methods, inspection
rules for liquid crystal instruments for automobiles.
This document is applicable to TFT liquid crystal instruments (including speedometer,
odometer, tachometer, fuel gauge, thermometer, oil pressure gauge, voltmeter, ammeter,
SOC meter, cruising mileage meter, urea level meter, barometer), which are used for
Category M and N automobiles. Other display instruments may make reference to this
standard.
2 Normative references
The contents of the following documents constitute the essential provisions of this
document through normative references in the text. Among them, for reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 2423.17-2008 Environmental testing for electric and electronic products - Part
2: Test method - Test Ka: Salt mist
GB 4094 Motor vehicles - Symbols for controls, indicators and tell-tales
GB/T 4094.2-2017 Electric vehicles - Symbols for controls, indicators and tell-tales
GB/T 6739 Paints and varnishes - Determination of film hardness by pencil test
GB/T 16422.2-2014 Plastics - Methods of exposure to laboratory light sources - Part
2: Xenon-arc sources
GB/T 18910.61-2021 Liquid crystal display devices - Part 6-1: Measuring methods
for liquid crystal display devices - Photoelectric parameter
GB/T 18655 Vehicles boats and internal combustion engines - Radio disturbance
characteristics - Limits and methods of measurement for the protection of on-board
receivers
GB/T 19951 Road vehicles - Disturbances test methods for electrical/electronic
component from electrostatic discharge
GB/T 21437.2-2008 Road vehicles - Electrical disturbances from conduction and
coupling - Part 2: Electrical transient conduction along supply lines only
GB/T 21437.3-2012 Road vehicles - Electrical disturbances from conduction and
coupling - Part 3: Electrical transient transmission by capacitive and inductive
coupling via lines other than supply lines
GB/T 28046.2-2019 Road vehicles - Environmental conditions and testing for
electrical and electronic equipment - Part 2: Electrical loads
GB/T 28046.3-2011 Road vehicles - Environmental conditions and testing for
electrical and electronic equipment - Part 3: Mechanical loads
GB/T 28046.4-2011 Road vehicles - Environmental conditions and testing for
electrical and electronic equipment - Part 4: Mechanical loads
GB/T 28046.5-2013 Road vehicles - Environmental conditions and testing for
electrical and electronic equipment - Part 5: Chemical loads
GB/T 30038-2013 Road vehicles - Degrees of protection (IP-code) - Protection of
electrical equipment against foreign objects, water and access
QC/T 413-2002 Basic technical requirements for automotive electric equipment
QC/T 550 Vehicle buzzer
QC/T 727 Instrument for automobile and motorcycle
SJ/T 11394 Measure methods of semiconductor light emitting diodes
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Liquid crystal instrument for automobile
An instrument assembly consisting of at least one liquid crystal display, that
comprehensively reflects vehicle conditions to the driver, through information
display and alarms (including full liquid crystal instrument and combined liquid
crystal instrument).
3.2
Full liquid crystal instrument
4.1.1 Transparent glass or transparent plastic parts shall not have bubbles, inclusions,
ripples, spots, scratches, that affect the reading. The protective layer shall be uniform,
without obvious defects such as bubbles, spots, rust, peeling off. The liquid crystal
display shall not be cracked or deformed. All components fit together well, without
looseness, falling off, visible foreign objects.
4.1.2 Division lines, pointers, numbers, characters, symbols shall be clear and complete,
without refraction and reading distortion.
4.1.3 The lighting effect shall ensure that the division lines, pointers, numbers, text
symbols of various instruments can be seen clearly; there shall be no glare from strong
light.
4.1.4 When the signal indicator light is on, the various indication signals, symbols,
patterns, colors on the instrument shall be clear and complete, without flashing. When
the signal indicator is off, the signal state shall be clearly different from when it is on.
4.2 General provisions
4.2.1 Important information display
The vehicle speed information and alarm information, which are displayed on the liquid
crystal instrument, shall remain clearly visible, while the vehicle is running. The alarm
information such as brake system malfunction, direction signal, TPMS should be
displayed outside the liquid crystal display.
4.2.2 Unit and division
4.2.2.1 Pointer display
The units and divisions of pointers (including virtual and physical pointers) display
comply with the following requirements:
- Units and divisions for speedometer, odometer, engine tachometer, fuel gauge,
temperature gauge, oil pressure gauge, voltmeter, ammeter shall meet the
requirements of QC/T 727;
- The unit of the urea level gauge is expressed in %, which shall not be less than 3
divisions: 0-25%-50%-100%;
- The unit of the SOC display is expressed in %, which shall not be less than 4
divisions: 0-25%-50%-75%-100%;
- For the unit and division of the barometer (air cylinder pressure), refer to the
pressure gauge of QC/T 727;
- For the unit and division of the motor tachometer, refer to the engine tachometer
of QC/T 727.
4.2.2.2 Digital display meter
The unit and division of the digital display meter shall meet the following requirements:
- The unit of the cruising mileage meter is expressed in km; the division value is not
greater than 10 km;
- The unit of the speedometer is expressed in km/h; the division value is not greater
than 1 km/h (except that the speed is lower than 5 km/h);
- The unit of the urea level gauge is expressed in %; the division value is not greater
than 5%;
- The unit of the fuel gauge is expressed in %; the division value is not greater than
5%;
- The unit of the engine and motor tachometer is expressed in r/min; the division
value is not greater than 200 r/min;
- The unit of the voltmeter is represented by V; the division value of the fuel vehicle
voltmeter is not more than 0.5 V; the division value of the electric vehicle voltmeter
is not large than 1 V;
- The unit of the ammeter is expressed in A; the division value is not greater than 0.5
A;
- The unit of the SOC meter is expressed in %; the division value is not greater than
5%;
- The unit of the barometer is expressed in MPa; the division value is not greater
than 0.1 MPa.
Note: Other display methods shall be determined, through negotiation between the supplier and
the buyer.
4.2.3 Labels and indicators on the panel
The signal indication symbols, patterns and colors on the instrument panel shall comply
with the provisions of GB 4094, GB/T 4094.2-2017. For other display symbols, see
Appendix A. The alarm symbols, which are arranged on the LCD panel, should be
equipped with text display at the same time.
4.2.4 Screen refresh rate (7-inch and above screens)
The minimum refresh rate of the screen is:
- Screen 25 Hz;
brightness to full black brightness) shall not be lower than 500:1.
4.12 Operating voltage range
The performance of the instrument, in the voltage range of (9 V ~ 16 V) or (16 V ~ 32
V), shall meet the requirements of 4.7, 4.8, 4.9, 4.11.
4.13 Temperature resistance
4.13.1 Resistance to low temperature storage
The meter is kept at -40 °C ambient temperature for 24 hours. After recovering at room
temperature for 2 hours, the performance shall meet 4.7, 4.8, 4.9, 4.11.
4.13.2 Resistance to low temperature working
During the -30 °C low-temperature resistance test, the performance of the instrument
shall meet the requirements of 4.7, 4.8, 4.9, 4.11.
4.13.3 Resistance to high temperature storage
The meter is kept at an ambient temperature of 85 °C for 48 hours. After recovering at
room temperature for 2 hours, the performance shall meet the requirements of 4.8, 4.9,
4.11.
4.13.4 Resistance to high temperature working
During the high temperature resistance test of 80 °C and 96 h, the performance of the
instrument shall meet the requirements of 4.8 and 4.9. After 96 hours of high
temperature resistance test at 80 °C, recover it at room temperature for 2 hours; the
reduction rate of brightness and contrast shall not exceed 25%.
4.13.5 Resistance to rapid temperature changes
The performance of the instrument shall meet the requirements of 4.7, 4.8, 4.9, after the
instrument has undergone a rapid temperature change test at a low temperature of -
40 °C and a high temperature of 85 °C, AND after recovering at room temperature for
2 hours. The reduction rate of brightness and contrast shall not exceed 25%.
4.14 Resistance to cyclic damp heat
After the instrument has passed the cyclic damp heat test, its performance shall meet
the requirements of 4.7, 4.8, 4.9, 4.11.
4.15 Salt spray resistance
After 48 hours of salt spray test, the instrument shall meet the requirements of 4.8 and
4.9, after recovering at room temperature for 2 hours.
4.16 Vibration resistance
After the instrument is subjected to the vibration test, there shall be no damage to the
appearance; the performance shall meet the requirements of 4.8 and 4.9.
4.17 Free fall performance
There shall be no hidden damage to the meter after the free fall test. The performance
of the meter, which has no damage to the shell, shall meet the requirements of 4.8 and
4.9.
4.18 Protection performance
The front protection level of the instrument shall reach IP5K2.
4.19 Chemical resistance
The performance of the accessible parts on the front of the meter, after the chemical
tests of beverages, glass water, cosmetics, alcohol, engine oil, shall meet the
requirements of 4.8 and 4.9.
4.20 Electromagnetic compatibility performance
4.20.1 Conduction immunity
The instrument shall comply with the provisions of 4.8 and 4.9, when carrying out the
conduction immunity test.
4.20.2 Radiation immunity
The instrument shall comply with the provisions of 4.8 and 4.9, when conducting the
electromagnetic radiation immunity test. The severity level of the test shall be
determined through negotiation between the supplier and the buyer.
4.20.3 Electrostatic discharge
The instrument shall comply with the provisions of 4.8 and 4.9, after the electrostatic
discharge immunity test.
4.20.4 Electromagnetic disturbance
The instrument shall comply with the limit value requirements of the conducted and
radiated immunity level 3 of components in GB/T 18655.
4.21 Resistance to abnormal voltage
4.21.1 Resistance to reverse voltage
The meter shall be subject to the reverse voltage test, for a duration of 60 s. After the
5.4 Test of sound alarm volume
Place the sound level meter, at a distance of 1 m from the instrument panel, at the
relative height of the analog instrument and the driver's ear, to make measurement
according to the provisions of QC/T 550.
5.5 Test of start-up time
Put the instrument into the -30 °C low temperature box for 2 hours. Connect the test
voltage. Measure the time, from when the power supply of instrument is turned on to
when the information can be displayed normally. If the test is carried out outside the
low temperature box, it shall be completed within 5 minutes after the sample is taken
out of the low temperature box.
5.6 Response time test
Put the instrument on the test bench. Connect the test voltage, to make the signal change
step by step from the lower limit value to the upper limit value. Measure the time which
is required for display changes.
5.7 Basic error test
Basic error test of speedometer, tachometer, fuel gauge, temperature gauge, oil pressure
gauge, voltmeter, ammeter is carried out, according to the provisions of QC/T 727. The
basic error test of urea level gauge and SOC gauge shall be carried out, in accordance
with the provisions of fuel gauge in QC/T 727. The basic error test of the barometer is
carried out, in accordance with the provisions of the pressure gauge in QC/T 727.
5.8 Static current test
Put the instrument on the test bench. Connect the test voltage. Make the instrument
work normally. Then simulate the shutdown of the whole vehicle. Wait for the
instrument to be completely sleep, before measuring the quiescent current of the
instrument.
5.9 Optical performance test
5.9.1 Brightness and brightness uniformity
5.9.1.1 Brightness test
Put the meter on the test bench in the dark room. Connect the test voltage. Make the
meter work normally. Adjust the brightness to the maximum. Measure the brightness of
the central point vertically, by a luminance meter at a distance of 500 mm.
5.9.1.2 Brightness uniformity test
According to the method in 5.9.1.1, use a luminance meter to measure the luminance
The test shall be carried out, in accordance with the provisions in 4.2 of GB/T 28046.2-
2019.
5.13 Temperature resistance test
5.13.1 Test of resistance to low temperature storage
The test shall be car...