ISO 9816-2018 PDF

Full title and description

ISO 9816:2018 — Passenger cars — Power-off reaction of a vehicle in a turn — Open-loop test method. This International Standard specifies an open‑loop test procedure for measuring how a passenger car reacts during a turn when motive power is suddenly reduced by releasing the accelerator pedal; it is intended for objective measurement of vehicle behaviour in controlled test conditions.

Abstract

ISO 9816:2018 defines open‑loop test methods to determine a vehicle’s reaction in a turn to a sudden drop in motive power caused by accelerator release. The methods apply to passenger cars as defined by ISO 3833 and describe how to perform, record and interpret controlled power‑off maneuvers to assess vehicle response.

General information

• Status: Published (confirmed following systematic review).
• Publication date: April 2018 (published 20 April 2018).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.100 (Road vehicles engineering; vehicle dynamics and testing).
• Edition / version: Edition 3 (2018).
• Number of pages: 23.

Key bibliographic and lifecycle details (status, edition, page count and review/confirmation history) are recorded on the official ISO record for ISO 9816:2018.

Scope

Specifies open‑loop test procedures for passenger cars to assess vehicle response when power is abruptly reduced during a turning manoeuvre (release of the accelerator). The standard applies to passenger cars as defined in ISO 3833 and covers the controlled execution of the manoeuvre, required instrumentation, measurement signals, data capture and basic analysis to characterise the power‑off reaction. It is intended for test laboratories, vehicle manufacturers and researchers needing repeatable, comparable measures of vehicle behaviour under power‑off conditions.

Key topics and requirements

• Defined open‑loop test manoeuvre for power‑off (accelerator release) during a turn.
• Vehicle category applicability (passenger cars per ISO 3833).
• Instrumentation and signal requirements (vehicle speed, yaw rate, lateral acceleration, steering input, throttle position, etc.).
• Test conditions and repeatability criteria (track/road conditions, run sequence, environmental notes).
• Data recording, processing and presentation requirements for objective comparison.
• Safety and procedural notes to protect test personnel and vehicles during dynamic maneuvers.

These topics summarize the principal technical content and typical measurement/recording expectations contained in the standard.

Typical use and users

Used by automotive OEM vehicle dynamics teams, independent vehicle test laboratories, regulatory or type‑approval bodies (where applicable), tyre and suspension suppliers, and academic researchers. Typical uses include comparative vehicle handling assessment, vehicle development (tuning of powertrain, ESC and suspension), safety validation and research into transient vehicle dynamics.

Related standards

ISO 9816 is part of the family of vehicle dynamics and handling test standards maintained by ISO/TC 22/SC 33. Standards commonly referenced alongside ISO 9816 include ISO 3833 (vehicle types and definitions), ISO 4138 (steady‑state circular driving behaviour — open‑loop test methods) and standards dealing with lateral transient response and test track methods (e.g., ISO 7401). Vocabulary and vehicle dynamics terminology are covered in ISO 8855. These related documents provide definitions, complementary manoeuvres and test procedures used together with ISO 9816 for comprehensive handling and dynamics assessment.

Keywords

power‑off reaction; open‑loop test; passenger cars; vehicle dynamics; handling; accelerator release; transient response; test method; ISO 9816; ISO/TC 22/SC 33.

FAQ

Q: What is this standard?

A: ISO 9816:2018 is an ISO international standard titled “Passenger cars — Power‑off reaction of a vehicle in a turn — Open‑loop test method” that defines a test method for measuring vehicle response when motive power is suddenly reduced during a turn.

Q: What does it cover?

A: It covers open‑loop test procedures for passenger cars (as defined in ISO 3833), including the manoeuvre description, required measurements and basic data handling to characterise the vehicle’s power‑off reaction during turning.

Q: Who typically uses it?

A: Vehicle dynamics engineers, OEM test teams, independent test laboratories, tyre and chassis suppliers, and researchers use ISO 9816 for development, comparative testing and research into transient handling behaviour.

Q: Is it current or superseded?

A: ISO 9816:2018 (Edition 3) was published in April 2018 and was reviewed and confirmed in 2023, so the 2018 edition is the current, confirmed version.

Q: Is it part of a series?

A: It is part of the suite of ISO vehicle dynamics and handling test standards developed by ISO/TC 22/SC 33. Complementary standards include ISO 4138 (steady‑state circular driving behaviour), ISO 7401 (lateral transient response / test track methods) and ISO 3833 (vehicle type definitions); ISO 8855 provides related vehicle dynamics vocabulary. These documents are commonly used together for comprehensive handling evaluation.

Q: What are the key keywords?

A: Key keywords are power‑off reaction, open‑loop test, vehicle dynamics, handling, passenger cars, accelerator release, transient response, measurement, ISO 9816.