ISO 7975:2019 PDF

Passenger cars — Braking in a turn — Open-loop test method

Название (английский):

ISO 7975:2019

Passenger cars — Braking in a turn — Open-loop test method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 22
Дата публикации:: 16 апреля 2019 г.
Издание:: ISO IS 7975 edition 4 version 1
ICS:: 43.100

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Описание (английский):

This document specifies an open-loop test procedure to examine the effect of braking on course holding and directional behaviour of a vehicle. Specifically, the method determines how the steady-state circular response of a vehicle is altered by a braking action only. This document is applicable to passenger cars as defined in ISO 3833 and to light trucks. The open-loop manoeuvre specified in this test method is not representative of real driving conditions but is useful to obtain measures of vehicle braking behaviour resulting from control inputs under closely controlled test conditions.

Технические детали

Технический комитет: ISO/TC 22/SC 33 - Vehicle dynamics and chassis components
SKU: ISO 7975:2019

Abstract

Overview

ISO 7975:2019, "Passenger cars - Braking in a turn - Open‑loop test method", specifies a repeatable open‑loop test procedure to quantify how a braking action alters a vehicle’s steady‑state circular response. The method applies to passenger cars (ISO 3833) and light trucks and is intended to produce controlled, discriminatory measures of braking behaviour in a turn. The manoeuvre is deliberately not representative of everyday driving but is useful for controlled evaluation of vehicle dynamics and brake system effects, including recognition of regenerative braking and active control systems.

Key topics and technical requirements

Test principle: Start from a steady‑state circular run (constant longitudinal speed and fixed steering wheel angle) and apply a controlled brake input while recording driver input and vehicle response.
Measured variables (minimum): moment of brake application, steering‑wheel angle, lateral acceleration, longitudinal acceleration, longitudinal velocity, yaw velocity, sideslip angle (and/or lateral velocity). Recommended additional measurements: brake system pressure and wheel rotational speed.
Measuring equipment and accuracy: ISO 15037‑1:2019 measurement and data‑processing requirements apply. The standard specifies recommended accuracies (e.g., moment of brake application detection to ±0.05 s; brake pressure measurement accuracy guidance).
Brake conditioning and warm‑up:
- Disc/disc systems: 60 run‑in brake applications from 100 → ~20 km/h with staged decelerations (approx. 2, 3, 5 m/s²).
- Disc/drum or drum/drum systems: 200 applications with staged decelerations.
- Warm‑up: tyre and component warm‑up per ISO 15037‑1 and five full stops to engage ABS during warm‑up.
Brake temperature limits: front discs/drums 80–120 °C before each test; rear

Overview

Key topics and technical requirements

Test principle: Start from a steady‑state circular run (constant longitudinal speed and fixed steering wheel angle) and apply a controlled brake input while recording driver input and vehicle response.
Measured variables (minimum): moment of brake application, steering‑wheel angle, lateral acceleration, longitudinal acceleration, longitudinal velocity, yaw velocity, sideslip angle (and/or lateral velocity). Recommended additional measurements: brake system pressure and wheel rotational speed.
Measuring equipment and accuracy: ISO 15037‑1:2019 measurement and data‑processing requirements apply. The standard specifies recommended accuracies (e.g., moment of brake application detection to ±0.05 s; brake pressure measurement accuracy guidance).
Brake conditioning and warm‑up:
- Disc/disc systems: 60 run‑in brake applications from 100 → ~20 km/h with staged decelerations (approx. 2, 3, 5 m/s²).
- Disc/drum or drum/drum systems: 200 applications with staged decelerations.
- Warm‑up: tyre and component warm‑up per ISO 15037‑1 and five full stops to engage ABS during warm‑up.
Brake temperature limits: front discs/drums 80–120 °C before each test; rear

ISO 7975:2019 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

Похожие стандарты

Abstract

Overview

Key topics and technical requirements

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