GB/T 44043-2024Passenger cars - Free-steer behaviour - Steering release open-loop test method (English PDF)

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

6 Measuring equipment