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GB/T 40521.2-2021 English PDF (GBT40521.2-2021)

GB/T 40521.2-2021 English PDF (GBT40521.2-2021)

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GB/T 40521.2-2021: Passenger cars test track for a severe lane-change manoeuvre -- Part 2: Obstacle avoidance

This document specifies the size of the test track for the closed-loop test of severe lane-change manoeuvre for subjective evaluation of the obstacle avoidance ability of passenger cars. This document applies to passenger cars that are defined in GB/T 3730.1; it can be implemented by reference for other types of vehicles whose total mass is no more than 3.5 t.
GB/T 40521.2-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 43.020
CCS T 41
Passenger cars test track for a severe lane-change
manoeuvre - Part 2: Obstacle avoidance
(ISO 3888-2:2011, Passenger cars - Test track for a severe lane-change
manoeuvre - Part 2: Obstacle avoidance, MOD)
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Specification details ... 6
Appendix A (Informative) Test method ... 10
References ... 13
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document is part 2 of GB/T 40521 "Passenger cars test track for a severe lane-change manoeuvre". The following parts have been released for GB/T 40521:
-- Part 1: Double lane-change;
-- Part 2: Obstacle avoidance.
This document uses the redrafting method to modify and adopt ISO 3888-
2:2011 "Passenger cars - Test track for a severe lane-change manoeuvre - Part 2: Obstacle avoidance".
The technical differences between this document and ISO 3888-2:2011, and the reasons are as follows:
-- With regard to the normative references, this document makes technical adjustments to adapt to the technical documents of China. The
adjustments are concentrated in Chapter 2 ?€?Normative references?€?. The
specific adjustments are as follows:
??? Remove the reference to ISO 3833:1977;
??? Add a reference to GB/T 3730.3 (see Chapter 3).
The following editorial changes have been made for this document:
-- Change the standard name;
-- Add the reference to GB/T 3730.1.
Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying patents.
This document was proposed by the Ministry of Industry and Information
Technology of the People's Republic of China.
This document shall be under the jurisdiction of National Technical Committee of Auto Standardization (SAC/TC 114).
Passenger cars test track for a severe lane-change
manoeuvre - Part 2: Obstacle avoidance
1 Scope
This document specifies the size of the test track for the closed-loop test of severe lane-change manoeuvre for subjective evaluation of the obstacle
avoidance ability of passenger cars.
This document applies to passenger cars that are defined in GB/T 3730.1; it can be implemented by reference for other types of vehicles whose total mass is no more than 3.5 t.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.
GB/T 3730.3, Motor vehicles and towed vehicles - Dimensions of vehicles - Terms and definitions
3 Terms and definitions
Terms and definitions determined by GB/T 3730.3 and the following ones are applicable to this document.
3.1
Vehicle width
Vehicle width, excluding the rearview mirror.
4 Specification details
4.1 Obstacle avoidance test track size
Appendix A
(Informative)
Test method
A.1 Severe lane-change manoeuvre of obstacle avoidance
A.1.1 Principle
The severe lane-change manoeuvre of obstacle avoidance is a dynamic
evaluation method. The process is to drive the vehicle from the initial lane to the adjacent parallel lane quickly, and then back to the original lane, during which the vehicle shall not exceed the lane boundary.
The purpose of this operation is to enable the vehicle to alternately generate higher lateral acceleration, so as to evaluate the lateral dynamics of the vehicle. A.1.2 Some characteristics for evaluating lane-keeping ability
The severe lane-change manoeuvre of obstacle avoidance is used to assess the vehicle's ability to avoid an obstacle suddenly in front of it. The driver can select the vehicle driving path in the set test track.
For the performance of the "person-vehicle-road" system in actual driving, this kind of preview control is a very important evaluation method. After selecting a suitable driving path, the driver can repeat driving on this path at a certain degree of accuracy.
A.1.3 Limitations
This test is a closed-loop test. The driver's control strategy will have a significant impact on the test results. Objective measurement of vehicle dynamics-related performance should not be performed; only subjective evaluation is
recommended.
Due to the difference in the driving path of the vehicle during each measurement, the vehicle speed obtained from multiple tests will appear obvious dispersion. Even if the longitudinal control process of the vehicle (i.e., releasing the accelerator at 2 m in section 1) is strictly limited, more consistent vehicle speed data cannot be obtained. Therefore, classification shall not be based on vehicle speed, and the minimum vehicle speed for testing shall not be specified. A.1.4 Conclusion

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