ISO 14793-2011 PDF

Full title and description

Road vehicles — Heavy commercial vehicles and buses — Lateral transient response test methods. This International Standard specifies test procedures and measurement requirements to characterise the transient (short‑term) lateral response behaviour of heavy commercial vehicles, combinations, buses and articulated buses.

Abstract

ISO 14793:2011 provides open‑loop test methods for determining transient response behaviour of heavy vehicles as defined in ISO 3833 (vehicle categories M3, N2, N3, O3 and O4). The tests are intended to give reproducible measures of how a vehicle responds to specified steering inputs under controlled conditions; they are not intended to replicate all real driving conditions but to allow comparison and assessment of transient behaviour.

General information

• Status: Published (International Standard; confirmed as current in periodic review).
• Publication date: February 2011 (effective/publication date 3 February 2011 in ISO records).
• Publisher: International Organization for Standardization (ISO), prepared by ISO/TC 22/SC 33.
• ICS / categories: 43.080.01 (Commercial vehicles in general); related national adoptions may additionally index under 43.080.20 (buses).
• Edition / version: Edition 2 (2011).
• Number of pages: 29 pages (ISO published text). Note: some national/adopted versions (for example BSI publications) show different pagination (e.g. 40 pages) because of national front/back matter and formatting.

Scope

Specifies test methods to determine the transient lateral response behaviour of heavy commercial vehicles, heavy commercial vehicle combinations, buses and articulated buses (trucks and trailers above 3.5 t; buses above 5 t). The standard defines the applicable vehicle categories (M3, N2, N3, O3, O4), the required instrumentation and measurement signals, and a set of open‑loop steering inputs and manoeuvres for producing repeatable transient response data for analysis and comparison.

Key topics and requirements

• Defined open‑loop transient manoeuvres and steering inputs to provoke lateral response (references include one‑period sinusoidal and pseudo‑random steering inputs in related TRs).
• Measurement and instrumentation requirements (typical signals: steering wheel/steer angle, yaw rate, lateral acceleration, vehicle speed, wheel/axle loads and wheel forces where relevant).
• Vehicle applicability and classification mapped to ISO 3833 and UNECE/EC categories (M3, N2, N3, O3, O4).
• Test conditions and repeatability guidance so results can be compared between laboratories and manufacturers.
• Normative references and cross‑references to related test methods and technical reports (for example ISO/TR 8725 and ISO/TR 8726 series on sinusoidal and pseudo‑random transient inputs).

Typical use and users

Used by vehicle manufacturers, chassis and suspension suppliers, independent test laboratories, research organisations and regulatory bodies involved in vehicle dynamics testing and safety assessment. Typical uses include R&D characterisation, comparative evaluation of design changes, and supporting regulatory or type‑approval activities where transient lateral behaviour is relevant.

Related standards

Standards in the same family and frequently referenced together include ISO 14792:2011 (Steady‑state circular tests), ISO 14794:2011 (Braking in a turn — open‑loop methods) and ISO 14791:2000 (Lateral stability test methods for combinations and articulated buses). These documents address complementary aspects of directional control, steady‑state and stability testing for heavy vehicles.

Keywords

transient response, lateral response, heavy commercial vehicles, buses, open‑loop manoeuvres, vehicle dynamics, ISO 3833, steering input, test method, vehicle stability

FAQ

Q: What is this standard?

A: ISO 14793:2011 is an international test‑method standard that specifies procedures to measure the lateral transient response behaviour of heavy commercial vehicles and buses.

Q: What does it cover?

A: It covers open‑loop transient test methods (specified steering inputs/manoeuvres), required measurements and test conditions for trucks, trailers, buses and articulated buses in the heavy vehicle categories defined by ISO 3833 and UNECE/EC classifications. The tests provide reproducible metrics for comparing transient lateral behaviour.

Q: Who typically uses it?

A: Vehicle OEMs, component suppliers, accredited test laboratories, research institutes and regulators use this standard for R&D, comparative testing and to support vehicle approval or conformity activities.

Q: Is it current or superseded?

A: ISO 14793:2011 replaced ISO 14793:2003. The 2011 edition has been reviewed and confirmed in ISO’s periodic review process (confirmed in 2023), so the 2011 edition is the current valid edition at the time of review.

Q: Is it part of a series?

A: Yes — it is part of a family of ISO test methods for heavy vehicles (examples: ISO 14791 for lateral stability of combinations, ISO 14792 for steady‑state circular tests, ISO 14794 for braking in a turn). These related documents together cover transient, steady‑state and stability aspects of vehicle directional control.

Q: What are the key keywords?

A: transients, lateral response, heavy commercial vehicle, bus, open‑loop maneuver, vehicle dynamics, steering input, test method.