ISO 11270:2014 pdf download – Intelligent transport systems-Lanekeeping assistance systems (LKAS)—Performance requirements and test procedures.
— IFLKAS Is not available due to a failure, the driver shall be informed.
5.2.3 Symbols
— If symbols are used to identify LKAS function or malfunction, standardized symbols in accordance with ISO 2575 are recommended to be employed.
5,3 Minimum functionality
To cover the main purpose to help the driver to keep the vehicle inside the lane, the LKAS shall pass the test procedure defined in Clause 6.
5.4 Operational limits
The LKAS should he designed in a way that the driver is able to use the LKAS safely in all situations. Therefore, the vehicle actions which are induced by the lane keeping actions shall be Iimted.
— The magnitude of the lateral acceleration which is induced by the lane keeping action shall not exceed LKAS_LaLAceLmax. Also the moving average over haifa second of the lateral jerk should be limited to:
— LKAS_Lat_Jerk_max.;
— LKAS_Lat_Acel_max • 3 rn/s2
— LKAS_L,at_Ierk_niax = 5 rn/s3.
— The lane keeping action shall not cause a longitudinal deceleration larger than 3 rn/s2. If the lane keeping action causes a longitudinal deceleration larger than 1,0 rn/s2. this shall not cause a speed reduction more than 5 rn/s.
— In case of a transition from LKAS active state to IKAS stand-by state, the lane keeping action shall not end suddenly but shall be faded out smoothly.
— The vehicle owner’s manual shall inform the driver that LKAS operation is not guaranteed to be the same as on a dry, flat road If 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 oft/on or, is accomplished.
6 Performance evaluation test methods
Due to different actuators to realize interventions. e.g. steer torque or steer angle versus single sided braking, it is necessary to define a test, which can be passed by both systems.
6.1 Environmental conditions
— Test location shall bean a flat, dry, and clean asphalt or concrete surface.
— Temperature range shall be between —20 C and .40 C.
— The wind speed shall be less than 3 rn/s.
— Horizontal visibility range shall be greater than 1 km.
— Visible lane markings of the test location shall be in good condition in accordance with the nationally defined visible lane markings. Also, they shall be marked in accordance with applicable standards for lane marking design and materials,
6.2 Test course conditions
The course shall be long enough to maintain a minimum vehicle speed tol at least 2(1 m/s) while allowing the vehicle to drift out from the lane at a low rate of departure.
The width of the lane marking shall be in the range of 0,1 m to 0.3 maccording to applicable regulations for highway like roads.
The width of the lane relative to the centre of the lane markings shall be in the range of 3,4 m to 3,9 m according to applicable regulations for highway like roads.
6.3 Test vehicle conditions
The test vehicle mass shall be between complete vehicle kerb mass’) plus driver and test equipment (combined mass of driver and test equipment shall not exceed 150 kg) and maximum authorized total mass21 (Refer to ISO 15037). No alterations shall be made once the test procedure has begun.
6.4 Test system installation and configuration
The LKAS shall be Installed and configured in accordance with the instructions provided by the manufacturer. For tests of the LKAS with a user adjustable intervention threshold, each test shall be performed with the intervention threshold set at its latest setting. No alterations to the system shall be made once the test procedure has begun.