GB/T 44043-2024 PDF English
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GB/T 44043-2024: Passenger cars - Free-steer behaviour - Steering release open-loop test method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT44043-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
CCS T 40
GB/T 44043-2024
Passenger cars - Free-steer behaviour - Steering release
open-loop test method
(ISO 17288-1.2011, Passenger cars - Free-steer behaviour - Part 1.Steering release
open-loop test method, MOD)
Issued on: MAY 28, 2024
Implemented on: DECEMBER 01, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Basic principle... 5
5 Measurement variables... 6
6 Measuring equipment... 6
7 Test conditions... 7
8 Test method... 7
9 Data analysis... 8
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
“Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents”.
This document has modified and adopted ISO 17288-1.2011 “Passenger cars - Free-
steer behaviour - Part 1.Steering release open-loop test method”.
The technical differences between this document and ISO 17288-1.2011 and their
reasons are as follows.
- REPLACE ISO 3833 and ISO 8855 by normative references GB/T 3730.1 and
GB/T 12549 (see Clause 3 of this document), to adapt to the technical conditions
of China.
- REPLACE ISO 15037-1.2006 by normative reference GB/T 40501-2021 (see
Clause 5, Clause 6, Clause 7, Clause 8, Clause 9 of this document), the consistency
between the two documents is “modified”, to adapt to the technical conditions of
China.
- MODIFY the typical working range of steering-wheel angle in Table 1 (see 6.1 of
this document), to be consistent with 5.1.1 in GB/T 40501-2021.
This document has made the following editorial changes.
- In order to coordinate with the existing standards, the name of the standard has
been changed to “Passenger cars - Free-steer behaviour - Steering release open-
loop test method”.
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This document was proposed by 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).
Drafting organizations of this document. State Key Laboratory of Automotive
Simulation and Control of Jilin University, CATARC Automotive Inspection Center
(Tianjin) Co., Ltd., Pan Asia Technical Automotive Center Co., Ltd., Geely Automobile
Research Institute (Ningbo) Co., Ltd., China Automotive Engineering Research
Institute Co., Ltd., Hefei University of Technology, Guangzhou Automobile Group Co.,
Ltd. R & D Center, Great Wall Motor Co., Ltd., Anhui Giti Passenger Radial Tire Co.,
Ltd., Nanjing Automobile Group Co., Ltd. Automotive Engineering Research Institute.
Passenger cars - Free-steer behaviour - Steering release
open-loop test method
1 Scope
This document specifies the test method for measuring the transient response of
passenger cars after steering-wheel release from a steady-state steering state.
This document applies to M1 category vehicles.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 3730.1 Terms and definitions of motor vehicles, trailers and combination
vehicle - Part 1.Types
GB/T 12549 Terms and definitions for vehicle controllability and stability
GB/T 40501-2021 General condition of vehicle dynamics test for passenger cars
(ISO 15037-1.2019, MOD)
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 3730.1 and
GB/T 12549 apply.
4 Basic principle
This test is designed to evaluate the ability of a vehicle to drive in a straight path after
steering-wheel release from a steady-state circular driving state.
The initial condition of the test is a steady-state circular motion. During the test, the
driver releases the steering wheel, the steering-wheel angle and vehicle response are
measured and recorded, and the characteristic values based on the recorded signals are
calculated.
5 Measurement variables
5.1 Reference coordinate system
Define the relevant variables according to the coordinate system specified in GB/T
40501-2021.
5.2 Measurement variables
It is recommended to measure the following variables.
- longitudinal velocity (vx);
- lateral acceleration (aY);
- yaw angular velocity ();
- steering-wheel angle (δH).
6 Measuring equipment
6.1 Requirements for measuring ranges and maximum errors
The test instruments required for the test and their measuring ranges and maximum
errors shall meet the requirements of Table 1, and each test instrument shall comply
with the provisions of GB/T 40501-2021.
If the error of any measurement variable exceeds the recommended maximum value,
the error and the actual maximum error value shall be stated in the test report given in
Annex B of GB/T 40501-2021.
6.2 Transducer installation
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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