GB/T 24551-2021Safety belt reminder for motor vehicles (English PDF)

Foreword

This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.

This Document replaced GB/T 24551-2009 Safety Belt Reminder for Motor Vehicles.

Compared with GB/T 24551-2009, the major technical changes of this Document are as follows besides the structural adjustment and editorial modifications.

--- Change the "Scope" (see Clause 1 of this Edition; Clause 1 of 2009 Edition);

--- Add the terms and definitions of visual warning, audible warning, vehicle in normal operation, passenger detection device, interval time, and intermittent time (see 3.4, 3.5, 3.7, 3.8, 3.9, 3.10 of this Edition);

--- Add the partial technical requirements for visual warning, audible warning, first level warning, and second level warning (see 4.2.1, 4.2.2, 4.2.3, 4.2.4 of this Edition);

--- Change the driving conditions for the activation of the second level warning (see 4.2.4.1 of this Edition; 4.2 of 2009 Edition);

--- Add the technical requirements for the seat belt reminder device for the driver and the passengers in the same row, and the rear passenger seat belt reminder device (see 4.3 and 4.4 of this Edition);

--- Add the test methods such as the first level warning, the second level warning, and the test duration (see 5.1, 5.2, 5.3 of this Edition).

Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents.

1 Scope

This Document specifies the terms and definitions, requirements and test methods of seat belt reminder for motor vehicles.

This Document applies to the seat belt reminder for the driver's seat position and the passenger seat position in the same row with the driver's seat of the Categories M and N vehicles; and the seat belt reminder for the rear passenger seat position of the Categories M1 and N1 vehicles; the seat belt reminder for other seat positions can be implemented by reference.

2 Normative References

The provisions in following documents become the provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.

GB 4094-2016 Motor Vehicles - Symbols for Controls, Indicators and Tell-Tales

3 Terms and Definitions

For the purposes of this Document, the following terms and definitions apply.

4 Technical Requirements

4.3 Seat belt reminder for driver and passengers in the same row 4.3.1 The seat belt reminder for the driver and the passengers in the same row shall meet the requirements of 4.2.

4.3.2 When the seat belt of any passenger in the front row is not fastened or the seat belt is unfastened while the vehicle is in normal operation, and the activation driving conditions described in 4.2.4.1 are met, the second level warning shall be activated.

5 Test Methods

5.2.3 Test on passenger seat in the same row with driver and rear passenger seat with passenger detection device 5.2.3.1 In the condition that the seat belt is not fastened before the vehicle is driven, the test of each passenger seat shall be carried out according to the following procedures.

5.2.3.2 In the condition that the seat belt is unfastened when the vehicle is running, the test of each passenger seat shall be carried out according to the following procedures.