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GB/T 28945-2012Portable braking performance tester for vehicles (English PDF)

便携式制动性能测试仪

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2012

Implementation date

June 1, 2013

Scope

GB/T 28945-2012 is the English-translated version of 便携式制动性能测试仪.

GB/T 28945-2012 is the Chinese standard "Portable braking performance tester for vehicles". Its scope clause reads: This standard specifies a portable brake performance tester requirements, test methods, inspection rules, marking, packaging and storage.

This standard applies to portable brake performance tester (hereinafter referred to as the tester). Its clauses include terms and definitions.

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Document preview — GB/T 28945-2012

National Standard of the People's Republic of China

Classification: T 39

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Scope
2 Normative references
3 Terms and Definitions
3.2 Mean fully developed deceleration of meanfulydevelopeddeceleration, MFDD
25.92 (Se-Sb)
3.3 Braking Coordinated Universal Time

1 Scope

This standard specifies a portable brake performance tester requirements, test methods, inspection rules, marking, packaging and storage.

This standard applies to portable brake performance tester (hereinafter referred to as the tester).

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 2423.1 Environmental testing for electric and electronic products Part 2. Test methods Test A. Cold

GB/T 2423.2 Environmental testing for electric and electronic products Part 2. Test methods Test B. Dry heat

GB/T 2423.3 Environmental testing for electric and electronic products Part 2. Test methods - Test Cab. Damp heat test

GB/T 2423.10 Environmental testing for electric and electronic products Part 2. Test methods Test Fc. Vibration (sinusoidal)

GB 7258 Safety requirements for operation of motor vehicles

GB/T 17626.3 electromagnetic compatibility test and measurement technology RFEMS test

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1

By recording the time history of the vehicle during braking deceleration values calculated velocity after the distance calculated to get in line with GB 7258

Seeking an average deceleration (MFDD) fully developed and braking Coordinated Universal Time, for determining the vehicle's braking performance portable test instrument.

3.2 Mean fully developed deceleration of meanfulydevelopeddeceleration, MFDD

The average deceleration (MFDD) fully developed according to equation (1).

MFDD = V b-V2e

25.92 (Se-Sb)

(1)

Where.

The average deceleration MFDD --- fully developed, in meters per second squared (m/s2);

Vb --- 0.8V0, test speed, in units of kilometers per hour (km/h);

Ve --- 0.1V0, test speed, in units of kilometers per hour (km/h);

V0 --- test vehicle brake initial speed in kilometers per hour (km/h);

Sb --- test speed from between V0 ~ Vb vehicle distance in meters (m);

Se --- test speed from a vehicle traveling between V0 ~ Ve distance in meters (m).

3.3 Braking Coordinated Universal Time

Brake coordination time is the time to slam the brakes, until the foot contact with the brake pedal (or hand touches the brake lever) from the deceleration of the vehicle […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Cited by

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