ISO 15622-2018 pdf download.Intellig igent transport systems – Adaptive cruise control systems – Performance requirements and test procedures.
This document contains the basic control strategy, minimum functionality requirements, basic driver interface elements, minimum requirements for diagnostics and reaction to failure, and performance test procedures for Adaptive Cruise Control (ACC) systems.
ACC systems are realised as either Lull Speed Range Adaptive Cruise Control (FSRA) systems or Limited Speed Range Adaptive Cruise Control (LSRA) systems. LSRA systems are further distinguished into two types, requiring manual or automatic clutch. Adaptive Cruise Control is fundamentally intended to provide longitudinal control of equipped vehicles while travelling on highways (roads where non- motorized vehicles and pedestrians are prohibited) under free-flowing and for FSRA-type systems also for congested traffic conditions. ACC can be augmented with other capabilities, such as forward obstacle warning. For FSRA-type systems the system will attempt to stop behind an already tracked vehicle within its limited deceleration capabilities and will be able to start again after the driver has input a request to the system to resume the journey from standstill. The system is not required to react to stationary or slow moving objects
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
iSO 2575. Road vehicles — Symbols for controls, indicators and tell-tales
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— I EC Electropedia: available at http./Jwww.clectropcdia.org/
— ISO Online browsing platform: available at http://wwwisonr/ohp
5 Classification
5.1 Type of ACC systems
Different configurations of actuators for longitudinal control result in very different system behaviour. Therefore, based on the two different ACC classes, three types of ACC systems are addressed in this document.
The deceleration capability of the ACC system shall be clearly stated in the vehicle owner’s manual. All types incorporate active brake control. In case of active brake intervention in vehicles with a clutch pedal (type LSRA 1) the driver shall be informed clearly and early about a potential conflict between brake and engine idle control, if the clutch cannot be disengaged automatically. A practicable and unambiguous handing-over procedure shall be provided for the driver. See 6.11.
6 Requirements
61 Basic control strategy
ACC systems shall, as a minimum, provide the following control strategy and state transitions. The following constitutes the fundamental behaviour of ACC systems.
— When the ACC is active, the vehicle speed shall be controlled automatically either to maintain a clearance to a forward vehicle, or to maintain the set speed, whichever speed is lower. The change between these two control modes is made automatically by the ACC system.
— The steady-state clearance may be either self-adjusting by the system or adjustable by the driver (see 6.11).
— If there is more than one forward vehicle, the one to be followed shall be selected automatically (see 6.2.3.3).
— Only for FSRA-type: The state shall change from following control to hold state within a time period not to exceed 3 sec after the subject vehicle has come to a stop.
— Only for FSRA-type: In Hold” state, automatic brake control shall be accomplished for keeping the subject vehicle stationary.
— Only for LSRA-type: The transition from ‘ACC stand-by” to ACC active shall be inhibited if the subject vehicle’s speed is below a minimum operational speed, Vlc,w. Additionally, if the vehicle’s speed drops below while the system is in the MACC active” state, automatic acceleration shall be inhibite Optionally, the ACC system may drop from “ACC active to MACC stand-by” (see 6.12 and 6.4).
6.2 Functionality
6.2.1 Control modes
The transition between the control modes (following controlled or speed controlled) shall be made automatically.
6.2.2 StatIonary or slow moving targets
Generally, it is not a requirement that an ACC system is designed to respond to the presence olsiationaly or slow moving targets. lithe system is designed not to respond to stationary targets the driver shall be informed at least by a statement in the vehicle owner’s manual.
Systems of FSRA-type will and systems of LSRA-type may attempt to stop behind an already tracked and stopping vehicle within their limited deceleration capabilities.
6.2.3 Following capability
6.2.3.1 General
Tmin shall be the minimum selectable time gap br lollowing control mode under steady-state conditions for all speeds v. Tmin shall be greater than or equal to 0,8 s.
At least one time gap setting r in the range of 1,5 s to 2,2 s shall be provided for speeds higher than 8 rn/s. Under steady-state conditions the minimum clearance shall be MAX(Cmin, TmjnV).
Under transient conditions, the clearance may temporarily fall below the minimum clearance. If such a situation occurs, the system shall adjust the clearance to attain the desired clearance.
For all FSRA-type systems and those LSRA type systems which attempt to stop behind a stopping vehicle (see 6.2.2 above): As a minimum requirement the system shall be able, starting from steady state following, to stop behind a gradually stopping vehicle which is braking with the acceleration astopping at a speed below Vstopping. (refer to test procedure 732).ISO 15622 pdf free download.