SAE J2399_201409

Adaptive cruise control (ACC) is an enhancement of conventional cruise control systems that allows the ACC-equipped vehicle to follow a forward vehicle at a pre-selected time gap, up to a driver selected speed, by controlling the engine, power train, and/or service brakes. This SAE Standard focuses on specifying the minimum requirements for ACC system operating characteristics and elements of the user interface. This document applies to original equipment and aftermarket ACC systems for passenger vehicles (including motorcycles). This document does not apply to heavy vehicles (GVWR > 10,000 lbs. or 4,536 kg). Furthermore, this document does not address other variations on ACC, such as “stop & go” ACC, that can bring the equipped vehicle to a stop and reaccelerate. Future revisions of this document should consider enhanced versions of ACC, as well as the integration of ACC with Forward Vehicle Collision Warning Systems (FVCWS). This Surface Vehicle Recommended Practice contains the basic minimum recommended practices for the control strategy, functionality, driver interface elements, system diagnostics, and vehicle response to recognized failure for Adaptive Cruise Control (ACC) systems, with a focus on the ACC system operating characteristics and elements of the user interface. ACC is intended to provide longitudinal control of equipped vehicles under free-flowing traffic conditions. Both (i) ISO 15622 – Transport information and control systems – Adaptive Cruise Control systems – Performance requirements and test procedures [2009-08-28] and (ii) ISO 22179 – Intelligent Transport Systems – Full Speed Range Adaptive Cruise Control Systems – Performance requirements and test procedures [2007-06-14] documents were reviewed. Updates in this version of J2399 represent a consensus, based on (i) the latest publications and references pertaining to ACC, (ii) a service brake definition, (iii) clearer explanations and/or definitions of ACC operational characteristics, and (iv) possible ACC test procedures.