Description / Abstract:
This SAE Recommended Practice defines the system and component
functions, measurement metrics, and testing methodologies for
evaluating the functionality and performance of ground vehicle tire
pressure maintenance (ATIS) systems (systems which automatically
restore the inflation pressure to its specified level), and
recommended maintenance practices for these systems within the
known operating environments.
These systems are recommended to address all serviceable tires
as originally installed on a vehicle by the OEM and/or specialty
vehicle manufacturer, and for the aftermarket (including
replacement or spare parts) are recommended (but optional) to
address all tire/rim combinations installed after initial vehicle
sale or in-use dates.
This document is applicable to all axle and all wheel
combinations for the following vehicle types - single unit powered
vehicles exceeding 7257 kg (16 000 lb) gross vehicle weight rating
(GVWR), and multi-unit vehicle combinations, up to three towed
units, which use an SAE J560 connector for power and/or
communication, or equivalent successor connector technology. For
combination vehicles including two or more trailers, the dolly
axles are also included. The included vehicles can be newly
manufactured vehicles or existing vehicles, fitted with air or
hydraulic braking systems.
SPECIAL NOTE: Equipment known as ‘dual tire equalizers' are
commonly used with this category of vehicles. When employing an
ATIS system, dual tire equalizers systems are not recommended as
they run counter to the purpose of the maintenance system.
NOTE: The following systems are not being addressed in this
edition of the subject document.
1. The management system types and more mature/complex versions
of maintenance and management types, to include on-board
reporting/storage/retrieval data/control capabilities, will be
addressed separately by future changes/additions to this document
series.
2. Tire pressure monitoring systems - These systems have been
addressed under SAE J2848-1.
Purpose
The installed systems for the maintenance of tire inflation
pressure defined herein are on-board vehicle systems only. The
maintenance type systems described herein may be controlled
mechanically, electronically, and/or a combination of both, and
should include sensing, restoring, and indicating/communicating,
and recording (when specified by the OEM or user) capabilities. The
design approach taken is expected to support the purpose and
performance objectives of such a maintenance type system, and to
function within the intended operating environment and design
configuration of the vehicle itself.
The tire pressure system of the maintenance (ATIS) type is
intended to (1) restore the tire's lost inflation gas, measured as
inflation pressure, relative to the SSP (specified service
pressure) under each operational stage; (2) maintain the specified
service pressure level for the typical range of ambient conditions;
and (3) provide the driver with indications of low uncorrected
pressure(s) and system malfunction.