GB/T 42611-2023 English PDF (GBT42611-2023)

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GB/T 42611-2023: Test method for sightseeing vehicle brake performance
GB/T 42611-2023
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 97.200.40
CCS Y 57
Test method for sightseeing vehicle brake performance
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: SEPTEMBER 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Technical requirements ... 5
4.1 General requirements for sightseeing vehicles ... 5
4.2 Special requirements for sightseeing combination buses ... 7
5 Test methods ... 8
5.1 Preparation before the test ... 8
5.2 Visual inspection ... 8
5.3 Service braking test ... 9
5.4 Strength test for the service braking system ... 9
5.5 Parking braking test on ramps ... 10
5.6 Braking heat fade test for garden patrol minibuses ... 10
5.7 Braking heat fade test for sightseeing combination buses ... 10
5.8 Braking heat fade recovery test ... 10
5.9 Speed limiting braking test for garden patrol minibuses ... 10
5.10 Air pressure test for sightseeing combination bus braking system ... 11
5.11 Braking test after the carriage of the sightseeing combination bus is
disconnected ... 11
References ... 13
Test method for sightseeing vehicle brake performance
1 Scope
This document specifies the technical requirements and test methods for the braking
performance of sightseeing vehicles.
This document is applicable to the braking performance test of sightseeing vehicles
(including garden patrol minibuses and sightseeing combination buses, hereinafter
referred to as "sightseeing vehicles").
2 Normative references
The following documents contain the provisions which, through normative reference in
this document, constitute the essential provisions of this document. For the dated
referenced documents, only the versions with the indicated dates are applicable to this
document; for the undated referenced documents, only the latest version (including all
the amendments) is applicable to this document.
GB/T 21268 General technical conditions for garden patrol minibus
GB/T 38433 General technical specifications for sightseeing combination bus
3 Terms and definitions
The terms and definitions defined in GB/T 21268 and GB/T 38433 and the following
apply to this document.
3.1 braking distance
The distance traveled from the moment the driver starts to activate the brake control
device to the moment the sightseeing vehicle stops, when the sightseeing vehicle travels
at a specific initial speed.
3.2 service braking system
The braking system by which the driver can directly or indirectly control the sightseeing
vehicle to slow down or stop the sightseeing vehicle.
3.3 parking braking system
On permitted ramps or level roads, the braking system that uses a mechanical
mechanism to keep the sightseeing vehicle stationary, while the driver does not need to
continuously operate the control device.
3.4 braking device
A mechanism or device that slows, stops a vehicle's wheels, or holds a vehicle's wheels
in a stopped state.
NOTE: Generally it refers to the actuating components of the braking system and its ancillary devices.
3.5 braking heat fade
Multiple braking operations or driving with the braking device in an incompletely
combined state cause the braking device temperature to rise, resulting in a decline in
the braking performance of the sightseeing vehicle.
3.6 braking stability
During the braking process, the ability of the sightseeing vehicle to maintain straight
driving without adjusting the steering wheel, which is reflected in the fact that any part
of the vehicle (except for parts not included in the width of the vehicle) during the
braking process does not exceed the specified test channel width.
3.7 electronic parking device
The device in which the holding mechanism is activated by an electronic switch button,
and the electronic control unit and actuator work together to realize the parking braking.
NOTE: This device is a parking brake device controlled by an electronic system.
4 Technical requirements
4.1 General requirements for sightseeing vehicles
4.1.1 The pedal, handle, or electronic parking devices that implement service braking
and parking braking shall be convenient for the driver to operate. Sightseeing vehicles
shall have a complete service braking system and parking braking system that are
sufficient to decelerate, stop, and park the vehicle. The service braking function shall
act on all wheels of the sightseeing vehicle. The control device of the service braking
and the control device of the parking braking system shall be independent of each other.
4.1.2 The service braking distance and braking stability shall meet the requirements of
Table 1, and the brake pedal force shall not be greater than 700 N.
4.1.8 The service braking pedal or handle shall be arranged according to the operating
habits of the right foot or right hand.
4.1.9 The service braking system shall not affect the function of the service braking due
to corrosion of the brake pipeline by the brake fluid or air resistance caused by the
action of the engine and other heat sources.
4.1.10 Garden patrol minibuses shall be equipped with brake lights at the rear of the
car; sightseeing combination buses shall be equipped with brake lights in the last
carriage. The brake lights are triggered when the driver steps on the brake pedal.
4.1.11 Garden patrol minibuses with a speed limit function, when the specified speed
limit is reached, will automatically decelerate the vehicle through the retarder, motor
speed limit, or automatic start of the service braking system. The deceleration speed is
adjustable and the vehicle speed can be limited to within 110% of the design parameter
value.
4.2 Special requirements for sightseeing combination buses
4.2.1 For sightseeing combination buses that use air pressure braking, when the air
pressure of the braking system is lower than the starting air pressure, the alarm device
shall be able to continuously send an audible or visible alarm signal to the driver.
4.2.2 The braking system of each carriage shall have an independent air reservoir. The
capacity of the air reservoir shall ensure that under the condition of rated working
pressure and no further inflation, after five consecutive maximum braking travels of the
sightseeing combination bus, the pressure in the air reservoir can still remain no lower
than the starting air pressure.
4.2.3 The air pressure braking system of sightseeing combination buses shall be
equipped with a pressure limiting device to ensure that the air pressure in the air
reservoir does not exceed the maximum allowable air pressure. The air pressure braking
system shall be equipped with a device to keep the compressed air dry and separate oil
and water. After the braking air pressure reaches the rated working pressure, turn off
the power of the vehicle and keep it stationary for 2 hours; there shall be no obvious air
loss. After starting the sightseeing combination bus, press the brake pedal for five
consecutive times full travel; during this period, the braking system shall not alarm, and
the brake charging pump shall not start.
4.2.4 When the carriage is suddenly decoupled and separated while the sightseeing
combination bus is running, causing the braking pipe or braking signal line to break,
the carriage braking system shall brake immediately and enable ...