ISO 14722:1998/Amd 1:2011

Overview

ISO 14722:1998/Amd 1:2011 is an important amendment to the international standard focused on the vocabulary related to moped and moped-rider kinematics. Developed by ISO Technical Committee ISO/TC 22, Subcommittee SC 23, this amendment updates key terms and definitions used for describing the motion behaviors and forces acting on mopeds and their riders. It provides uniform terminology essential for precise communication and technical analysis in vehicle dynamics, safety testing, and design engineering.

This standardized vocabulary enhances clarity in the study of mopeds-light two-wheeled vehicles-by defining motion parameters such as steering velocity, braking forces, and roll angles. The document ensures consistent use of language across the automotive and transportation industry, facilitating international collaboration and innovation.

Key Topics

The amendment updates several technical definitions related to moped kinematics, including:

• Steering Velocity
  Defined as the angular velocity of the sprung part of the steering assembly about the z′-axis, this term is critical for analyzing steering dynamics and handling characteristics.

• Braking Force
  Specifies the negative longitudinal tyre force generated due to braking torque applied in the x-direction, fundamental for vehicle safety and braking performance assessment.

• Conicity Force
  A lateral tyre force that does not change sign with the rotation direction when both slip angle and camber angle are zero. Understanding this helps in tyre behavior and stability evaluation.

• Plysteer Force
  Another lateral tyre force, but one that changes sign with rotation direction under zero slip and camber angles, relevant in studying tyre construction effects on steering.

• Resultant Roll Angles
  The amendment clarifies the angles formed by planes through various axes and the moped-rider combination's center of gravity, categorizing them into conventional, geometrical, and effective roll angles, essential in rollover and cornering studies.

• Roll Velocity
  Specifies angular velocities about the x-axis (bank velocity) with detailed definitions for conventional, geometrical, and effective roll velocities, supporting dynamic motion analyses.

Applications

Applying ISO 14722:1998/Amd 1:2011 provides multiple practical benefits, including:

• Vehicle Design and Engineering
  Enables precise communication of kinematic parameters for the development of mopeds and related safety features.

• Safety Testing and Certification
  Standardized terms support testing laboratories and regulatory bodies in consistent evaluation of moped stability, braking performance, and rider safety.

• Research and Development
  Facilitates research in vehicular dynamics, contributing to improved handling characteristics and rider ergonomics through well-defined vocabulary and measurement consistency.

• International Collaboration
  Provides a common language for manufacturers, engineers, and policymakers worldwide, aiding in harmonizing vehicle regulations and standards.

• Educational and Training Resources
  Assists in the creation of technical materials and training courses by defining crucial kinematics terms related to mopeds and rider interactions.

Related Standards

ISO 14722:1998/Amd 1:2011 is part of a broader framework of international standards applicable to road vehicles and two-wheeled motor vehicles, closely collaborating with:

• ISO/TC 22 Road Vehicles Standards
  Covering diverse vehicle types and components, focusing on safety and performance standards.

• ISO/IEC Directives
  Providing the procedural guidelines for drafting and maintaining international standards.

• Automotive Steering and Dynamics Standards
  Including related standards addressing vehicle dynamics, tyre behavior, and rider safety enhancing the context for applying this vocabulary.

By referring to ISO 14722 and its amendments, stakeholders ensure compliance with the best practices for describing and analyzing the complex kinematic behavior of mopeds and their riders, advancing safety, innovation, and interoperability in the automotive sector.