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GB/T 38185-2019 English PDF (GBT38185-2019)

GB/T 38185-2019 English PDF (GBT38185-2019)

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GB/T 38185-2019: Performance requirements and testing methods for electronic stability control system (ESC) for commercial vehicles

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.
GB/T 38185-2019
NATIONAL STANDARD OF THE
PEOPLE 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

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