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JJF 1168-2024: Calibration Specification for Portable Braking Performance Testers of Vehicles
Status: Valid JJF 1168: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJF 1168-2024 | English | 399 |
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Calibration Specification for Portable Braking Performance Testers of Vehicles
| Valid |
JJF 1168-2024
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| JJF 1168-2007 | English | 559 |
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Calibration Specification for Portable Braking Performance Tester for Motor Vehicle
| Obsolete |
JJF 1168-2007
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Basic data | Standard ID | JJF 1168-2024 (JJF1168-2024) | | Description (Translated English) | Calibration Specification for Portable Braking Performance Testers of Vehicles | | Sector / Industry | Metrology & Measurement Industry Standard | | Word Count Estimation | 19,175 | | Date of Issue | 2024-09-18 | | Date of Implementation | 2024-12-18 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 1168-2024: Calibration Specification for Portable Braking Performance Testers of Vehicles---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Metrology Technical Specifications of the People's Republic of China
Calibration specification for portable brake performance tester
Released on 2024-09-18
Implementation on 2024-12-18
The State Administration for Market Regulation issued
Portable Braking Performance Tester
Calibration Specifications
Replaces JJF 1168-2007
Responsible unit. National Legal Metrology Management Metrology Technical Committee Motor Vehicle Inspection and Quarantine
Scoring Technical Committee
Main drafting unit. Zhejiang Institute of Metrology
Jilin Institute of Metrology
Hebei Provincial Institute of Metrology Supervision and Inspection
Participating in the drafting. Gansu Institute of Metrology
Shanghai Xipai Automation Instrument Engineering Co., Ltd.
Shandong Institute of Metrology
Henan Institute of Metrology
This specification is entrusted to the National Legal Metrology Management Metrology Technical Committee Motor Vehicle Inspection and Testing Technical Committee
The committee is responsible for interpreting
The main drafters of this specification are.
Shao Jianwen (Zhejiang Institute of Metrology)
Fang Facheng (Jilin Institute of Metrology)
Xing Peng (Hebei Provincial Institute of Metrology Supervision and Inspection)
Participating drafters.
Gao Decheng (Gansu Institute of Metrology)
Jiang Yuchen (Shanghai Xipai Automation Instrument Engineering Co., Ltd.)
Ma Xiao (Shandong Institute of Metrology)
Liu Tao (Henan Institute of Metrology)
Table of contents
Introduction (II)
1 Scope(1)
2 References(1)
3 Terminology (1)
3.1 Portable brake performance tester (1)
3.2 Indoor dynamic calibration device (1)
3.3 Braking coordination time (1)
4 Overview(1)
5 Metering characteristics (2)
5.1 Static calibration(2)
5.2 Dynamic calibration(2)
6 Calibration conditions(2)
6.1 Environmental conditions(2)
6.2 Measurement standards and other equipment (2)
7 Calibration items and calibration methods (3)
7.1 Static calibration(3)
7.2 Dynamic calibration(5)
8 Expression of calibration results (7)
9 Recalibration interval (7)
Appendix A Portable Braking Performance Tester Calibration Record (8)
Appendix B Calibration Certificate (Inner Page) Contents (9)
Appendix C Example of uncertainty assessment of indication error of portable brake performance tester (10)
Introduction
JJF 1071 "Rules for the Preparation of National Metrology and Calibration Specifications", JJF 1001 "General Metrology Terms and Definitions",
JJF 1059.1 "Evaluation and Expression of Uncertainty in Measurement" together constitute the basic series supporting the revision of this specification
specification.
This specification mainly refers to GB/T 28945-2012 "Portable Braking Performance Tester", GB 7258 "Motor Vehicle
Compared with JJF 1168-2007, except for the editorial revision, this specification mainly
The main technical changes are as follows.
--- Added the term brake coordination time, and specified its measurement range and calibration method (see 5.2.2 and
7.2.3);
--- Deleted the appearance and data retention and calibration methods in the metrological characteristics, and divided the metrological characteristics into static calibration
and dynamic calibration;
--- Added indoor dynamic calibration device as one of the dynamic calibration devices, and clarified its calibration method (see
3.2 and 7.2.2).
The previous versions of this specification are as follows.
---JJF 1168-2007.
Calibration specification for portable brake performance tester
1 Scope
This specification applies to the calibration of portable brake performance testers.
2 References
This specification references the following documents.
GB 7258-2017 Technical conditions for motor vehicle operation safety
GB/T 28945-2012 Portable Braking Performance Tester
T/CMAJD009-2020 Dynamic inspection items and methods of portable brake performance tester
For any referenced document with a date, only the version with the date is applicable to this specification.
The latest version (including all amendments) shall apply to this specification.
3 Terminology
The following terms and definitions defined in GB/T 28945-2012 and T/CMAJD009-2020 apply to this
specification.
By recording the time history of the deceleration value during the vehicle braking process and calculating the speed and distance, we can calculate
The fully developed mean deceleration (MFDD) and brake coordination time required by GB 7258 are used to judge the maneuverability.
Portable test instrument for the braking performance of vehicles.
[Source. GB/T 28945-2012, 3.1]
The device for calibrating the dynamic performance of portable brake performance tester in the laboratory is generally composed of a linear track,
It consists of a mobile platform, a drive device, and a measurement and control system.
[Source. T/CMAJD009-2020, 3.2, modified]
3.3 Brake coordinated time
When braking suddenly, the time from when your foot touches the brake pedal (or your hand touches the brake handle) to when the vehicle decelerates to
The time required to fully develop 75% of the average deceleration value specified in GB 7258.
[Source. GB/T 28945-2012, 3.3]
4 Overview
The portable brake performance tester is a test instrument used to measure the braking performance of motor vehicles.
The time history of the deceleration value during the process, after calculating the speed and distance, can be calculated to meet the requirements of GB 7258
The fully exerted mean deceleration (MFDD) and the braking coordination time are generally determined by the acceleration sensor, the host, and the brake.
It consists of a pedal contact switch and a micro printer.
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