ISO 10521-1-2006 PDF

Full title and description

ISO 10521-1:2006 — Road vehicles — Road load — Part 1: Determination under reference atmospheric conditions. This part specifies methods for determining the road load of a motor vehicle running on a level road under defined reference atmospheric conditions (coastdown, torquemeter and wind‑tunnel/chassis‑dynamometer methods).

Abstract

Specifies procedures to determine road load for subsequent test purposes (for example fuel consumption and exhaust emission measurements) using the coastdown method, the torquemeter method or the wind‑tunnel/chassis‑dynamometer method. Applicable to motor vehicles (as defined in ISO 3833:1977) with a gross vehicle mass up to 3 500 kg.

General information

• Status: Published (International Standard).
• Publication date: October 2006 (ISO record: 2006‑10).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.020 (Road vehicles — general).
• Edition / version: Edition 1 (2006).
• Number of pages: 30 (ISO official pagination); some national/adopted versions show additional front matter and list 34–40 pages.

Scope

This part determines the road load of a vehicle running on a level road under specified reference atmospheric conditions for use in laboratory and field test programs (e.g., fuel consumption and exhaust emission tests). It provides method descriptions, test conditions, required measurements and reporting conventions for the coastdown, torquemeter and wind‑tunnel/chassis‑dynamometer approaches. The standard is applicable to motor vehicles up to a gross vehicle mass of 3 500 kg and references vehicle definitions in ISO 3833:1977.

Key topics and requirements

• Definition of reference atmospheric conditions and how to correct measurements to those conditions.
• Coastdown method: procedures for performing coastdown runs, data filtering and derivation of aerodynamic and rolling resistance coefficients.
• Torquemeter method: use of in‑vehicle torque measurement to derive road load characteristics.
• Wind‑tunnel / chassis‑dynamometer correlation method: procedure to correlate wind‑tunnel or chassis dynamometer data with on‑road behavior.
• Reporting requirements, measurement uncertainty considerations and required instrumentation/calibration practices.
• Applicability limits (vehicle class and gross vehicle mass ≤ 3 500 kg) and cross‑references to vehicle definitions (ISO 3833:1977).

Typical use and users

Used by automotive OEM test laboratories, independent vehicle test houses, regulatory authorities and research organizations to establish road‑load models for laboratory testing (fuel consumption and emissions) and to ensure repeatable test conditions between vehicles and test sites. Test engineers, vehicle performance specialists and homologation bodies commonly apply this standard.

Related standards

ISO 10521 (1992) — earlier edition (withdrawn) and the parent series on road‑load determination; ISO 3833:1977 (vehicle types and definitions) is referenced for the definition of motor vehicles; work and maintenance of this part is under ISO/TC 22/SC 34 (road vehicles subcommittee).

Keywords

road load, coastdown, torquemeter, chassis dynamometer, wind tunnel, vehicle testing, fuel consumption, emissions testing, reference atmospheric conditions, ISO 10521

FAQ

Q: What is this standard?

A: ISO 10521-1:2006 is an ISO International Standard that specifies methods to determine the road load of motor vehicles under defined reference atmospheric conditions for test and laboratory correlation purposes.

Q: What does it cover?

A: It covers three principal methods (coastdown, torquemeter and wind‑tunnel/chassis‑dynamometer correlation), how to perform tests, corrections to reference atmospheric conditions, data processing and reporting for vehicles up to 3 500 kg GVW.

Q: Who typically uses it?

A: Automotive manufacturers, test laboratories, certification/homologation agencies and vehicle researchers use the standard to derive repeatable road‑load models for fuel consumption and emissions testing.

Q: Is it current or superseded?

A: The ISO record lists ISO 10521‑1:2006 as published and subject to periodic systematic review; the version from 2006 is the published edition. Users should check the ISO catalogue or their national standards body for any revisions or newer parts before relying on it for regulatory compliance.

Q: Is it part of a series?

A: Yes — it is the Part 1 entry in the ISO 10521 series (previous single‑document ISO 10521 editions exist); it is linked to other road‑load and vehicle measurement standards and to vehicle definition standards such as ISO 3833:1977.

Q: What are the key keywords?

A: Road load, coastdown, torquemeter, chassis dynamometer, wind tunnel, reference atmospheric conditions, fuel consumption testing, emissions testing, vehicle test methods.