BS ISO 21717:2018 pdf download – Intelligent transport systems – Partially Automated In-Lane Driving Systems (PADS)一 Performance requirements and test procedures.
6.1.1 off state In off state PADS shall not perform any action. -The ON transition from PADS off to PADS stand-by can be performed by the driver or automatically, e.g. after the ignition is switched on and no system failure has occurred. 6.1.2 stand-by state – – In off state PADS shall not perform any action. The transition ACTIVATE from stand-by to active state shall only be done when initiated by the driver. The transition ACTIVATE may lead to PADS longit or to PADS longit-lat state. -The transition OFF from PADS stand-by to PADS off can be performed by the driver or automatically, e.g. after the ignition is switched off or a system failure has occurred. 6.1.3 active state – In both states of the PADS active state the system shall provide speed and distance control in accordance with ISO 15622. Therefore ACC shall be in active state when PADS is in PADS active state. In both states of the PADS active state the system shall evaluate the activation criteria for lateral control. One of the activation criteria for PADS longit-lat shall be that the system has determined the position of the vehicle within the lane relative to the lane boundaries of the subject vehicle’s lane or relative to a forward vehicle. It is up to the manufacturer to decide whether it is necessary to detect the position of the subject vehicle’s lane by one or both lane boundaries of the lane and/or relative to forward vehicles. Other criteria to be selected by the manufacturer may be the type of the lane boundaries (e.g. incidental road feature or solid or dashed lane marking), a minimum vehicle speed, driver actions, steering angle and other vehicle conditions. At least under the conditions of the test defined in Clause 7 the activation criteria shall be fulfilled.
6.3 Minimum functionality 6.3.1 General PADS should be designed to handle normal traffic situations while travelling on roads where non- motorized vehicles and pedestrians are prohibited. They are not required to handle special situations like entries and exits, turning, construction zones, ramps and narrow curves. 6.3.2 Longitudinal control To cover the main purpose to keep a safe distance to forward vehicles in the same lane, PADS shall pass the test procedures defined in ISO 15622. 6.3.3 Lateral control PADS shall be able to keep the vehicle in the subject vehicle’s lane as long as the curve radius is larger than 500 m and the rate of change of curvature is continuous and does not exceed PADS_ curvature_ rate_ max. The PADS may operate also at curve radii below 500 m. PADS_ curvature_ rate_ max= 4*10-5 1/m2 PADS shall pass the test procedures in Clause Z.