ISO 11270 pdf download – Intelligent transport systems — Lanekeeping assistance systems (LKAS)—Performance requirements and test procedures

ISO 11270 pdf download – Intelligent transport systems — Lanekeeping assistance systems (LKAS)—Performance requirements and test procedures.
LKAS provides support for sale lane keeping operations by drivers and do not perform automatic driving nor prevent possible lane departures. The responsibility for the safe operation of the vehicle always remains with the driver. LKAS shall, as a minimum, provide the following operations and state transitions. The following constitutes the fundamental behaviour of LKAS.
— The transition from LKAS off to LKAS on can be performed by the driver or automatically. e.g. after the ignition is switched on and no system failure has occurred. The transition from IKAS on to LKAS off can be performed by the driver or automatically, for instance after the ignition is switched off or a system failure has occurred.
— LKAS shall be operational for speeds between mErt and vmax. vrnin = 20 rn/s. vmox = 30 rn/s. or the maximum possible vehicle speed, whichever is less. It Is allowed to be operational In a wider speed range.
— In LKAS stand-by state, the system shall evaluate the activation criteria. LKAS shall not perform any lane keeping actions. One of the activation criteria shall be that the system has determined the position of the vehicle within the lane relative to the visible lane markings of Its own lane. It is up to the manufacturer to decide whether it is necessary to detect one or both visible lane markings of the own lane. Other criteria to be selected by the manufacturer can be the type of the lane marking (e.g. solid or dashed), a minimum vehicle speed, driver actions, steering angle, and other vehicle conditions. If all of the selected activation criteria arc met, the system shall transition from LKAS stand-by to LKAS active state. This transition can be done automatically or by a driver confirmation.
— In LKAS active state, the system shall evaluate the activation criteria. If any one of the selected activation criteria is not met, the system shall transition from LKAS active to IKAS stand-by state. In the LKAS active state, the system can perform lane keeping actions to influence the lateral movement of the subject vehicle with the intention of helping the driver to keep the vehicle within the lane when an unintended lane departure is likely. A lane keeping action influences the lateral movement of the subject vehicle with respect to the lane in such a way that the TTLC Increases compared to the vehicle movement without a lane keeping action (unless the driver overrides the system). The system can detect suppression requests to minimize nuisance lane keeping actions. The suppression request can be Issued, e.g. lithe driver operates a turn signal.
5.2 Bask driver interface and Intervention capabIlities
The system shall provide the following controls and Intervention capabilities:
5.2.1 Operation elements and system reactions
— The driver shall be provided with means to override the lane keeping action at any time. Such means shall Include turning the steering wheel.
— Specific driver actions can be considered as a suppression request.
— The driver shall be provided with the means to transition from LKAS on to EKAS ott and to keep the system In the LKAS off state. Such transition shall be possible regardless of whether the system is in the LKAS active or the LKAS stand-by state.
— In case of a transition from LKAS active state to LKAS stand-by state, the lane kviping action shall not end suddenly but shall be faded out smoothly.
— The vehicle owner’s manual shall inform the driver that I.KAS operation is not guaranteed to be the same as on a dry, flat road ii it is under low traction conditions, on roads with lateral bend, super elevation, or adverse weather conditions.
— These operational limit requirements shall be fulfilled under all conditions.
5,5 Failure reactions
— Failures in the LKAS components shall result in immediate notification to the driver and LKAS shall transition to the LKAS off state. The notification shall remain active until the system is switched off.
— The reactivation of the LKAS shall be prohibited until a successful self-test, initiated by either Ignition off/on or LKAS.off/on. is accomplished.