ANNEX ISupplementary provisions
ANNEX I GENERAL PROVISIONS FOR ON-BOARD WEIGHING EQUIPMENT (‘OBW’) 1. General provisions 1.1. The following types of OBW systems are included in the scope of this Regulation: a) dynamic system: OBW system that determines the weight by collecting and processing information from parameters that are captured while the vehicle is in motion, such as accelerations, traction or braking forces, and which do not take place when the vehicle is standing still; b) static system: OBW system that determines the weight with information obtained from parameters that are captured while the vehicle is standing still, such as the pressure in an air bellow. 1.2. The implementation of this Regulation follows two stages: (a) stage 1 OBW referred to in point 5.2; (b) stage 2 OBW referred to in point 5.3. 1.3. The OBW shall calculate the total weight and, optionally, the axle weight. 1.4. The OBW shall comprise the following elements: a) a motor vehicle unit (‘MVU’) placed in the motor vehicle; b) optionally, a TU in the trailer or semi-trailer; c) sensors; d) for stage 2, a C-ITS station in each of the vehicles featuring either a MVU or a TU. 1.5. MVU and Trailer Unit may each consist of a single processing unit or be split into different units. 2. Motor vehicle unit (‘MVU’) The MVU shall: a) receive the axle load from the TU, if the latter is present; b) collect weight data from the sensors in the motor vehicle; c) process the available information and calculate the corresponding weight values; 3. Trailer unit (‘TU’) Where present, the TU shall: a) collect weight data from the sensors in the trailer or semi-trailer, process the available information and calculate the axle weights resulting from those data; b) transfer the axle weight values to the motor vehicle. 4. Calculation of weight 4.1. For dynamic systems, a first weight value shall be calculated at the latest 15 minutes after the vehicle starts to move forward and shall be recalculated, every 10 minutes henceforth or faster. 4.2. For static systems, weight values shall be calculated every minute when ignition is on and the vehicle is standing still. 4.3. The resolution of the calculated weight shall be 100 kg or better. 5. Exchange of information between the motor vehicle and the trailers or semi-trailers of a vehicle combination 5.1. Each trailer or semi-trailer shall make available to the motor vehicle the weight values calculated by the former in accordance with points 5.2 or 5.3, as applicable. 5.2. Stage 1 OBW 5.2.1. Each trailer or semi-trailer shall be assigned a position within the vehicle combination in the frame of a dynamic address assignment as set out in ISO 11992-2:2014. 5.2.2. After the address assignment phase is carried out, the TU of each trailer or semi-trailer shall transfer to the MVU the axle load sum or the axle load in accordance with the description provided in points 6.5.4.7 and 6.5.5.42 of ISO 11992-2:2014. 5.2.3. The messages on axle load sum or axle load shall follow the specifications set out in ISO 11992-2:2014 for the message types EBS22 and RGE22. 5.2.4. The format, routing and general parameter ranges of the messages shall be in accordance with points 6.1, 6.3 and 6.4 of ISO 11992-2:2014. 5.3. Stage 2 OBW The information between motor vehicle and the trailers or semi-trailers being towed shall be exchanged by means of C-ITS stations as set out in Annex II. 5.4. For both stage 1 and stage 2 OBW, different specifications may be used, provided that the OBW equipment in the motor vehicle and in the trailers or semi-trailers are compatible with them. 6. Data preparation and transfer to the DSRC-VU The MVU for stage 1 or the C-ITS station in the motor vehicle for stage 2, shall transmit to the DSRC-VU module the on-board weighing system (‘OWS’) data in accordance with Annex III. Figure 1 Example of layout for OBW in a stage 1 truck/semi-trailer vehicle combination Exchange of information between MVU and TU via ISO 11992-2:2014 TU DSRC-VU MVU Semi-trailer sensors Semi-trailer Motor vehicle sensors Motor Vehicle Figure 2 Example of layout for OBW in a stage 2 truck/semi-trailer vehicle combination TU C-ITS C-ITS DSRC-VU MVU 7. Weight information to the driver The driver shall be informed by a display of, at least, the total weight. 8. Accuracy 8.1. The accuracy of the calculated weight shall be ± 5 % or better when the vehicle is loaded at greater than 90 % of its maximum authorised weight. 8.2. Notwithstanding point 8.1, for stage 1 OBW the accuracy may be ± 10 % or better.