GB/T 18954-2017 in English

VALID

Methods of setting running resistance on a chassis dynamometer for motorcycles and mopeds

Issued on:2017-07-31
Implemented on:2018-02-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
$243.00

Standard No:	GB/T 18954-2017
Document status:	VALID
Title in English:	Methods of setting running resistance on a chassis dynamometer for motorcycles and mopeds
Title in Chinese:	摩托车和轻便摩托车底盘测功机行驶阻力的设定方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-07-31
Implemented on:	2018-02-01
Superseding:	GB/T 18954-2003 Chassis dynamometer setting for motorcycles and mopeds－Coastdown method
ICS Classification:	43.140-Motorcycles and mopeds
Professional Classification:	GB-National Standard
Related Keywords:	total resistance friction resistance resistance calculation fj= resistance km/h base mass vehicle curb weight front wheel rolling resistance
Related Topics:	resistance GBT18954 GB/T 18954-2003 GBT18954-2017 Motorcycles and Mopeds Complete electric motorcycles and electric mopeds Vibration method of motorcycle electronic equipment Electric motorcycle industry

《GB/T 18954-2017摩托车和轻便摩托车底盘测功机行驶阻力的设定方法》由TC114（全国汽车标准化技术委员会）归口，TC114SC1（全国汽车标准化技术委员会摩托车分会）执行，主管部门为工业和信息化部。

Introduction

Interpretation of the core content of the standard

This standard specifies two technical methods for simulating road driving resistance of motorcycles on a chassis dynamometer: road coasting test method (Chapters 7-9) and table lookup method (Chapter 10). The main revisions of the 2017 version include:

Expanding the scope of application to three-wheeled motorcycles
Adding a table lookup method as an alternative
Refining the environmental condition control requirements

Key terminology system

Terms	Definition	Unit of measurement
Driving resistance	The total resistance encountered by a motorcycle when driving (including the friction resistance of the transmission system)	N
Base speed	Standard speed point for calculating driving resistance	km/h
Base mass	Vehicle curb weight + 75kg driver weight	kg

Key points for the implementation of the road coasting test method

Test condition control

Road requirements: horizontal dry road surface, longitudinal slope ≤0.5%
Environmental restrictions: wind speed ≤3m/s, temperature 5-35℃, humidity ≤95%
Vehicle preparation: running-in must be completed, and the tire pressure must meet the manufacturer's standards

Data processing flow

Steps	Calculation formula	Parameter description
1. Driving resistance calculation	F_j=(m+m_r)*2Δv/(3.6ΔT_j)	m_r is estimated as 7% of the total mass
2. Curve fitting	F=f₀+f₂v²	Temperature/air pressure correction is required
3. Target resistance determination	F(v₀)=f₀+f₂*v₀²	Resistance value at reference speed point

Technical Specifications for Table Lookup Method

Equivalent Inertia Correspondence Table (Partial Examples)

Reference Mass (kg)	Equivalent Inertia (kg)	Front Wheel Rolling Resistance (N)	Air Drag Coefficient [N/(km/h)²]
95-105	100	8.8	0.0215
195-205	200	17.6	0.0230

Note: For a complete parameter table, see Table 4 in Chapter 10 of the standard.

Implementation recommendations

Principles for method selection

Road sliding method is preferred: Applicable to scenarios where accurate simulation of the resistance of a specific vehicle model is required
Applicable scenarios for the table lookup method: Rapid test of conventional quality vehicles, with attention to the applicability of vehicles with special structures