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GB/T 38185-2019 PDF in English


GB/T 38185-2019 (GB/T38185-2019, GBT 38185-2019, GBT38185-2019)
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GB/T 38185-2019: PDF in English (GBT 38185-2019)

GB/T 38185-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
T 24
Performance requirements and testing methods for
electronic stability control system (ESC) for
commercial vehicles
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 General requirements ... 5 
5 Performance requirements ... 5 
6 Test conditions ... 10 
7 Test methods ... 13 
Appendix A (Informative) Additional tests ... 17 
Performance requirements and testing methods for
electronic stability control system (ESC) for
commercial vehicles
1 Scope
This Standard specifies the terms and definitions, general requirements,
performance requirements, test conditions, and test methods for electronic
stability control system for commercial vehicles.
This Standard is applicable to M2, M3, N2, N3 type vehicles with a maximum
design total mass greater than 3500 kg equipped with an electronic stability
control system.
Note: The abbreviation form of electronic stability control system is ESC. The abbreviation
is used below.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 12428 Laden mass calculating method for buses
GB/T 12549 Terms and Definitions for Vehicle Controllability and Stability
GB 12676-2014 Technical requirements and testing methods for commercial
vehicle and trailer braking systems
GB/T 13594-2003 Antilock braking performance and test procedure for motor
vehicles and their trailers
GB/T 26987-2011 Road vehicles - Measurement of road surface friction
GB/T 30677 Performance requirements and testing methods for electronic
stability control system (ESC) for light vehicles
a) During the period from 1.5 s after the subject vehicle enters the test
starting point to passing the test end point, the ESC shall reduce the
output torque of the engine/drive motor by 10% or more than that
requested by the driver, which shall be lasted for at least 0.5 s;
b) The wheel of the subject vehicle, during the process from the test starting
point to passing the test end point, shall always remain in the test lane.
5.1.2 TEST according to 7.7.3. At least 6 of the 8 tests in each series meet the
following requirements:
a) The speed of the subject vehicle after passing the test starting point 3 s
shall not exceed 47 km/h;
b) The speed of the subject vehicle after passing the test starting point 4 s
shall not exceed 45 km/h;
c) The wheel of the subject vehicle, during the process from the test starting
point to passing the test end point, shall always remain in the test lane;
d) The ESC braking shall be activated.
5.2 ESC fault monitoring
5.2.1 The vehicle shall be fitted with an ESC signalling device and alert the
driver if there is any fault in the system which affects ESC control, response
signal generation or transmission.
5.2.2 The ESC fault signalling device shall meet the following requirements:
a) It is in the front field of view of the driver, which is convenient for the driver
at the driving position to check whether the state of the signalling device
is normal;
b) When observed during the travel of the vehicle, it shall be in an upright
state. Its orientation is shown in Figure 1;
c) It shall use one of the “ESC fault signal” identification symbols shown in
Figure 1 or the word “ESC” for indication;
d) It shall be yellow or amber;
e) After the signalling device is lit, it shall be bright and conspicuous enough,
so that the driver, after adapting to the environmental road lighting
conditions, can clearly observe whether driving during the day or night;
which no longer meets the performance requirements of 5.1.1 and 5.1.2, it is
not necessary to indicate it in the way of 5.3.3.
5.4 ESC OFF signalling device
5.4.1 If the manufacturer, in accordance with 5.3, installs a control device to
shut down or reduce the performance of the ESC, the signalling device
requirements of 5.4.2~5.4.5 shall be met, to alert the driver when the ESC
function is degraded. This requirement does not apply to the driver’s selection
mode as described in 5.3.2b).
5.4.2 If the vehicle manufacturer sets a control mode which makes the ESC not
meet the requirements of 5.1.1 and 5.1.2, an alarm device shall be provided to
indicate when the ESC is in this control mode.
5.4.3 The signalling device shall meet the following requirements:
a) It is in the front field of view of the driver, which is convenient for the driver
at the driving position to check whether the state of the signalling device
is normal;
b) When observed during the travel of the vehicle, it shall be in an upright
state. Its orientation is shown in Figure 2;
c) It shall use the ESC OFF identification symbol specified in 5.3.3 or the
word “ESC OFF” for indication. It is also possible to mark an “OFF” on the
control device described in 5.3.3 or 5.3.5, the illuminated fault signalling
device or its vicinity for indication;
d) It shall be yellow or amber;
e) After the signalling device is lit, it shall be bright and conspicuous enough,
so that the driver, after adapting to the environmental road lighting
conditions, can clearly observe whether driving during the day or night;
f) As long as the ESC is in a mode which cannot meet the requirements of
5.1.1 and 5.1.2, the signalling device signal shall remain lit;
g) Except as provided in 5.4.4 and 5.4.6, when the ignition locking system is
in the “ON” (“RUN”) position but the engine/drive motor is not running, or
when the ignition locking system is between “ON” (“RUN”) and “Start” and
the check position specified by the manufacturer, it shall light the ESC
OFF signalling device to perform a function check;
h) When the ESC is restored to the manufacturer’s initial default mode, the
signalling device shall be extinguished.
compartment or cabin to achieve full load; any axle load shall not exceed
the rated value.
6.3.4 During the test, the gearbox shall be in the forward gear. For vehicles with
an engine/drive motor brake which can be turned off, the engine/drive motor
brake shall be off.
6.3.5 The trailer shall meet the following requirements:
a) A flatbed semi-trailer with a single axle and the axle weight of no more
than 750 kg may be brake-free.
b) The height of center of mass of the trailer after loading shall be between
the saddle bearing surface and 610 mm above the saddle bearing surface.
c) The trailer shall be equipped with an auxiliary wheel.
d) Loaded by the trailer onto the non-steering axle of the tractor. The trailer
load shall not exceed the rated total mass of the axle of the trailer. If the
saddle pin of the tractor is adjustable, by adjusting its position, the load on
each axle of the tractor can be assigned, so that the axle load is as close
as possible and does not exceed the rated total mass of the axle. If the
saddle pin of the tractor is not adjustable, in order to make the axle load
of the tractor not exceed the allowable rated total mass of the axle, the
load of the trailer can be appropriately reduced.
6.3.6 The maximum design mass of the auxiliary wheels of the test vehicle shall
not exceed 1134 kg (excluding its fixture).
6.3.7 The tire pressure of the test vehicle shall be the rated value specified by
the manufacturer.
6.3.8 The main anti-folding system allows a minimum angle of 30° between the
tractor and the trailer.
6.3.9 If the vehicle is equipped with a self-locking bridge system or front-wheel
drive system which can be controlled by the driver, during the test, the system
shall be disconnected.
6.3.10 Vehicles fitted with one or more lifting bridges shall be tested under
conditions in which the lifting bridge is lowered.
6.3.11 During the test, the initial braking temperature of the brake friction lining
shall be between 60 °C~200 °C.
DRIVE the test vehicle 3 laps clockwise along a ring with a radius of 46 m; then
drive 3 laps counterclockwise. The speed of travel shall be such that the vehicle
produces a lateral acceleration of approximately 1 m/s2.
7.6 ESC function confirmation
After the system fault self-check is completed, the ESC fault indicator is not lit.
Confirm that the ESC system function has been turned on and is in normal
working state.
7.7 J steering test
7.7.1 Initial reference speed and reference speed determination
7.7.1.1 At an initial speed of 32 km/h±2 km/h, with 2 km/h successively
increased, perform clockwise and counterclockwise steering tests respectively,
until the ESC braking is activated or a wheel deviates from the lane. The vehicle
speed at 0.5 s before the ESC braking is activated is the respective initial
reference speed.
In the test, if there is a tire deviating from the lane at any point in the arc lane,
the test shall be repeated at the same speed. If any of the tires are out of the
lane again, then it is necessary to do 4 tests consecutively at the same speed.
7.7.1.2 At the initial reference speeds determined in 7.7.1.1, the clockwise and
counterclockwise steering tests are performed respectively, to determine the
respective reference speeds. 4 consecutive tests are performed in each
direction. If ESC braking occurs in at least 2 of the 4 consecutive tests, then the
minimum speed is the reference speed. If the condition of “at least 2
occurrences of ESC braking” is not satisfied, then the initial reference speed is
increased by 2 km/h, and the test is repeated until the reference speed is
determined.
7.7.2 Torque limit test
At a reference speed (±2 km/h) determined in 7.7.1.2, perform two rounds of
test. 4 consecutive tests are performed counterclockwise and clockwise
respectively. For each test, from the starting point to the end point, the driver
shall fully step on the accelerator pedal.
7.7.3 Rollover stability control test
Perform the rollover stability control test as follows:
a) Perform two rounds of test in clockwise and counterclockwise directions;
b) Before each test, the temperature of the hottest brake friction lining shall
Appendix A
(Informative)
Additional tests
A.1 Overview
This appendix gives the test methods for fixed-circle acceleration test and
single lane change test of electronic stability control system for commercial
vehicles.
A.2 Fixed-circle acceleration test
A.2.1 Test site and road requirements
A.2.1.1 The fixed-circle acceleration test shall be carried out on a flat and high-
adhesion-coefficient site. The test site shall be wide enough to ensure safe
testing.
A.2.1.2 The radius of the fixed-circle is in the range of 20 m~100 m. The lane
width is 3.7 m.
A.2.2 Test equipment
The test equipment shall be capable of measuring and recording the braking
pressure of all brakes of the service brake. For the train, it shall be capable of
measuring and recording the control port pressure of the trailer control valve.
The test equipment shall be capable of recording time, vehicle speed, steering
angle, yaw rate, lateral acceleration, accelerator pedal opening, engine/drive
motor torque, engine/drive motor speed, driver braking request, ESC working
state, and ESC torque control for engine/drive motor.
A.2.3 Vehicle preparation
The vehicle state shall comply with the provisions of 6.3.
A.2.4 Test procedure
A.2.4.1 The test shall be carried out with the ESC turned on.
A.2.4.2 The vehicle gradually accelerates along the set fixed-circle track, until
the engine/drive motor torque is limited and the vehicle speed no longer
increases. During the test, if the driver feels that the vehicle is unsafe, the test
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.