QC/T 1172-2022 PDF in English
QC/T 1172-2022 (QC/T1172-2022, QCT 1172-2022, QCT1172-2022)
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Performance requirements and test methods for vehicle air brake unit exhaust muffler
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Standards related to (historical): QC/T 1172-2022
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QC/T 1172-2022: PDF in English (QCT 1172-2022) QC/T 1172-2022
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
CCS T 24
Performance requirements and test methods for vehicle air
brake unit exhaust muffler
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
Introduction ... 7
1 Scope ... 8
2 Normative references ... 8
3 Terms and definitions ... 8
4 Performance requirements ... 10
5 Test requirements ... 11
6 Test method ... 12
Performance requirements and test methods for vehicle air
brake unit exhaust muffler
1 Scope
This document specifies the terms and definitions, performance requirements, test-
related requirements, test methods, of the exhaust muffler (hereinafter referred to as
muffler), which is used on the vehicle air brake unit.
This document is applicable to the use of automobile air brake components (such as:
relay valve, brake valve, trailer control valve, air dryer, etc.), which are used on the
vehicle air brake unit.
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 dated references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) applies to this document.
GB/T 3785.1-2010 Electroacoustics - Sound level meters - Part 1: Specifications
GB/T 5620 Road vehicles - Vocabulary and definition for braking of automotive
vehicles and their trailers
QC/T 35-2015 Automobile and trailer - Specifications and bench test methods of
pressure control equipment
QC/T 996-2015 Specifications and bench test methods of automobile air dryer
3 Terms and definitions
The terms and definitions, as defined in GB/T 5620, as well as the following terms and
definitions, apply to this document.
3.1
Exhaust noise
LP
4.3 Working durability
After the test according to 6.3, the muffler shall not be damaged; the insertion loss shall
meet the requirements in Table 1.
4.4 Waterproof performance (only applicable to mufflers with waterproof function)
4.4.1 Carry out the test according to 6.4.1. There shall be no water infiltration at the
exhaust port of the valve body.
4.4.2 Carry out the test according to 6.4.2. There shall be no water infiltration at the
exhaust port of the valve body.
5 Test requirements
5.1 Test device
5.1.1 The equipment used in the test shall meet the requirements of the test conditions
of the relevant items. It shall not adversely affect the function of the test sample. The
accuracy grade of the instruments or meters, which are used to record various
parameters in the performance test, shall not be lower than 0.5. The accuracy grade of
the instruments or meters, which are used to measure and record the parameters in the
durability test, shall not be lower than 1.5.
5.1.2 Unless otherwise specified, all tests shall be carried out, by installing the muffler
sample on the exhaust port of the matching valve, according to the requirements of the
product technical documents. The total volume of the auxiliary pipeline, in a single test
circuit, shall not exceed 0.15 L.
5.1.3 The sound level meter or other equivalent measuring system, which is used for
measurement, shall not be lower than the requirements of Type I sound level meter,
which is specified in GB/T 3785.1-2010.
5.2 Test sample
Unless otherwise specified, all samples shall complete all corresponding tests,
according to Table 2. For mufflers, that can be installed on a variety of valve bodies,
the device needs to be matched with each valve body, for testing.
6.1.4.3 Open the pressure regulating valve 2. Fill the air cylinder 3 with compressed air,
which is 200 kPa higher than the unloading pressure. Stabilize the pressure for 3
minutes.
6.1.4.4 Open the speed regulating valve 4. Feed compressed air into the air dryer, at a
flow rate of 455 L/min ~ 510 L/min. When the pressure on the pressure gauge 6 reaches
unloading and begins to drop, until the air dryer recovers pressure, record the peak noise
value, which is measured by the sound level meter.
6.1.4.5 Take the arithmetic mean LP2 of the three position measurement values.
6.1.4.6 Remove the muffler from the air dryer. Keep the other devices in the same
position. Carry out the test according to 6.1.4.3 ~ 6.1.4.5. Record LP1.
6.2 Exhaust time hysteresis ratio
6.2.1 Muffler matching the relay valve
6.2.1.1 Carry out the test according to 6.1.1.1 ~ 6.1.1.4. Record the relationship curve
of the pressure gauge 7 with time. Calculate the exhaust time tE1.
6.2.1.2 Remove the muffler from the relay valve. Carry out the test, according to 6.1.1.1
~ 6.1.1.4. Record the relationship curve of the air pressure value, which is displayed on
the pressure gauge 7 with time. Calculate the exhaust time tE2, according to the curve.
6.2.1.3 Calculate the exhaust time hysteresis ratio, according to formula (2).
6.2.2 Muffler matching the brake valve
6.2.2.1 Carry out the test according to 6.1.2.1 ~ 6.1.2.4. Record the relationship curve
of change of pressure gauge 9's indication value with time. Calculate the exhaust time
tE1.
6.2.2.2 Remove the muffler from the brake valve. Carry out the test according to 6.1.2.1
~ 6.1.2.4. Record the relationship curve of the change of pressure gauge 9's indication
value with time. Calculate the exhaust time tE2.
6.2.2.3 Calculate the exhaust time hysteresis ratio, according to formula (2).
6.2.3 Muffler matching the trailer control valve
6.2.3.1 Carry out the test according to 6.1.3.1 ~ 6.1.3.4. Record the relationship curve
of change of pressure gauge 6's indication value with time. Calculate the exhaust time
tE1.
6.2.3.2 Remove the muffler from the trailer control valve. Carry out the test according
to 6.1.3.1 ~ 6.1.3.4. Record the relationship curve of the change of pressure gauge 6's
indication value with time. Calculate the exhaust time tE2.
6.2.3.3 Calculate the exhaust time hysteresis ratio, according to formula (2).
6.3 Working durability
6.3.1 For the muffler matching with the relay valve, install the muffler to the relay valve.
Conduct the test according to 6.2.7, which is specified in QC/T 35-2015. After the test,
check whether the muffler is damaged. Retest the insertion loss, according to 6.1.1.
6.3.2 For the muffler matching the brake valve, install the muffler to the brake valve.
Conduct the test according to 6.1.7, which is specified in QC/T 35-2015. After the test,
check whether the muffler is damaged. Retest the insertion loss, according to 6.1.2.
6.3.3 For the muffler matching with the trailer control valve, install the muffler on the
trailer control valve. Conduct the test according to 6.4.7, which is specified in QC/T
35-2015. After the test, check whether the muffler is damaged. Retest the insertion loss,
according to 6.1.3.
6.3.4 For the muffler matching with the air dryer, install the muffler on the air dryer.
Carry out the test according to 7.12, which is specified in QC/T 996-2015. After the test,
check whether the muffler is damaged. Retest the insertion loss according to 6.1.4.
6.4 Waterproof performance
6.4.1 Static waterproof performance
6.4.1.1 See Figure 6 for the schematic diagram of the test device.
6.4.1.2 Install the muffler on the matching valve body. Seal all the ports of the valve
body. Then immerse it in a container, which is filled with water as shown in Figure 6.
The lowest point of the muffler is 1.2 m away from the water surface. The included
angle between axis and vertical direction is 15°.
6.4.1.3 After standing still for 15 minutes, take the sample to be tested out of the
container. Then remove the muffler. Check whether there is water infiltration, at the
exhaust port of the valve body.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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