BS ISO 20901:2020 pdf free.Intelligent transport systems一Emergency electronic brake light systems (EEBL)一Performance requirements and test procedures.
BS ISO 20901 This document contains the basic alert strategy, minimum functionality requirements, basic driver interface elements, minimum requirements for diagnostics and reaction to failure, and performance test procedures for Emergency Electronic Brake Light systems (EEBL). EEBL alerts the driver against danger caused by the emergency braking of an FV on the upcoming road, so that the driver may reduce the speed. The system does not include the means to control the vehicle to meet the desired speed. The responsibility for safe operation of the vehicle always remains with the driver. The scope of this document does not include performance requirements and test procedures of the wireless communication device used for EEBL. The requirements of communication devices are defined in other standards, e.g. the IEEE series listed in the Bibliography[6][7][8]. The test procedure in this document is designed for third party testing of the product while the test procedure can also be used for other stakeholders such as manufacturers or consumer unions. The document applies to light duty vehicles and heavy vehicles. These systems are not intended for off-road use.EEBL off state: The state that EEBL is off. This state has one of the following three causes: the driver has selected the off condition, the ignition is off, or the EEBL is in failure. The failure of EEBL means that the system cannot function as it is described in the user manual due to the failure of the system or the failure of the sub-component of the EEBL. The cause of failure can be, e.g. system malfunction, communication fail, failure during self- diagnosis process. EEBL system on state: For EEBL-T equipped on a FV, this state is either stand-by or broadcast state. For EEBL-R equipped on an SV, this state is either stand-by or alert state. Vehicles equipped with EEBL-T periodically broadcast and the vehicles equipped with the EEBL-R receive status messages. EEBL system stand-by state: For EEBL-T equipped on a FV, the system monitors the vehicle deceleration. For EEBL-R equipped on an SV, the system is ready to receive the message including the emergency braking flag. BS ISO 20901 pdf download.