ANNEX XIISupplementary provisions
ANNEX XII Requirements applying to EBS of vehicles with compressed-air braking systems or of vehicles with data communication via pin 6 and 7 of ISO 7638 connector and to vehicles fitted with such EBS 1. Definitions For the purposes of this Annex: 1.1. ‘point-to-point’ means a topology of a communication network with only two units. Each unit has an integrated termination resistor for the communication line; 1.2. ‘braking signal’ means a logic signal indicating brake activation. 2. General requirements 2.1. The electric control line shall conform to ISO 11992-1 and 11992-2:2003 including Amd.1:2007 and be a point-to-point type using the seven pin connector according to ISO 7638-1 or 7638-2:2003. The data contacts of the ISO 7638 connector shall be used to transfer information exclusively for braking (including ABS) and running gear (steering, tyres and suspension) functions as specified in ISO 11992-2:2003 including Amd.1:2007. The braking functions have priority and shall be maintained in the normal and failed modes. The transmission of running gear information shall not delay braking functions. The power supply, provided by the ISO 7638 connector, shall be used exclusively for braking and running gear functions and that required for the transfer of towed vehicle related information not transmitted via the electric control line. However, in all cases the provisions of point 5.2.1 shall apply. The power supply for all other functions shall use other measures. 2.2. The support of messages defined within ISO 11992-2:2003 including Amd.1:2007 is specified in Appendix 1 to this Annex for the tractor and towed vehicle as appropriate. 2.3. The functional compatibility of tractors and towed vehicles equipped with electric control lines shall be assessed at the time of type approval by checking that the relevant provisions of ISO 11992:2003, including ISO 11992-2:2003 and its Amd.1:2007 parts 1 and 2, are fulfilled. Appendix 2 to this Annex provides an example of tests that may be used to perform this assessment. 2.4. When a tractor is equipped with an electric control line and electrically connected to a towed vehicle equipped with an electric control line, a continuous failure (> 40 ms) within the electric control line shall be detected in the tractor and shall be signalled to the driver by the yellow warning signal specified in point 2.2.1.29.1.2 of Annex I, when such vehicles are connected via the electric control line. 3. Special requirements for the connections between tractors and towed vehicles for compressed-air braking systems 3.1. The electric control line of the tractor shall provide information as to whether the requirements of point 2.2.1.29.1.2 of Annex I can be satisfied by the electric control line, without assistance from the pneumatic control line. It shall also provide information as to whether it is equipped according to point 2.1.4.1.2 of Annex I with two control lines or according to point 2.1.4.1.3 of Annex I with only an electric control line. 3.2. A tractor equipped according to point 2.1.4.1.3 of Annex I shall recognise that the coupling of a towed vehicle equipped according to point 2.1.4.1.1 of Annex I is not compatible. When such vehicles are electrically connected via the electric control line of the tractor, the driver shall be warned by the red optical warning signal specified in point 2.2.1.29.1.1 of Annex I and when the system is energised, the brakes on the tractor shall be automatically applied. This brake application shall provide at least the prescribed parking braking performance required by points 3.1.3.1 and 3.1.3.2 of Annex II respectively. 3.3. In the case of a tractor equipped with two control lines as described in point 2.1.4.1.2 of Annex I, when electrically connected to a towed vehicle which is also equipped with two control lines, all of the following conditions shall be fulfilled: 3.3.1. both signals shall be present at the coupling head and the towed vehicle shall use the electric control signal unless this signal is deemed to have failed. In this case the towed vehicle shall automatically switch to the pneumatic control line; 3.3.2. each vehicle shall conform to the relevant provisions of Appendix 1 of Annex II for both electric and pneumatic control lines; 3.3.3. when the electric control signal has exceeded the equivalent of 100 kPa for more than 1 second, the towed vehicle shall verify that a pneumatic signal is present; should no pneumatic signal be present, the driver shall be warned from the towed vehicle by the separate yellow warning signal specified in point 2.1.4.1.2 of Annex I. 3.4. A towed vehicle may be equipped as described in point 2.1.4.1.3 of Annex I, provided that it can only be operated in conjunction with a tractor with an electric control line which satisfies the requirements of point 2.2.1.17.1 of Annex I. In any other case, the towed vehicle, when electrically connected, shall automatically apply the brakes or remain braked. The driver shall be warned by the separate yellow warning signal specified in point 2.2.1.29.2 of Annex I. 3.5. If the operation of the parking braking system on the tractor also operates a braking system on the towed vehicle, as permitted by point 2.1.2.3 of Annex I, then the following additional requirements shall be met: 3.5.1. When the tractor is equipped according to point 2.1.4.1.1 of Annex I, the actuation of the parking braking system of the tractor shall actuate a braking system on the towed vehicle via the pneumatic control line. 3.5.2. When the tractor is equipped according to point 2.1.4.1.2 of Annex I, the actuation of the parking braking system on the tractor shall actuate a braking system on the towed vehicle as prescribed in point 3.5.1 In addition, the actuation of the parking braking system may also actuate a braking system on the towed vehicle via the electric control line. 3.5.3. When the tractor is equipped according to point 2.1.4.1.3, of Annex I or, if it satisfies the requirements of point 2.2.1.17.1 of Annex I without assistance from the pneumatic control line, point 2.1.4.1.2 of Annex I, the actuation of the parking braking system on the tractor shall actuate a braking system on the towed vehicle via the electric control line. When the electrical energy for the braking equipment of the tractor is switched off, the braking of the towed vehicle shall be effected by evacuation of the supply line (in addition, the pneumatic control line may remain pressurised); the supply line may only remain evacuated until the electrical energy for the braking equipment of the tractor is restored and simultaneously the braking of the towed vehicle via the electric control line is restored. 4. Special additional requirements for service braking systems with electric control transmission 4.1. Tractors 4.1.1. With the parking braking system released, the service braking system shall be able to generate a static total braking force at least equivalent to that required by the prescribed Type-0 test, even when the ignition/start switch has been switched off and/or the key has been removed. In the case of tractors authorised to tow vehicles of category R3b or R4b, such vehicles shall provide a full control signal for the service braking system of the towed vehicle. It should be understood that sufficient energy is available in the energy transmission of the service braking system. 4.1.2. In the case of a single temporary failure (< 40 ms) within the electric control transmission, excluding its energy supply, (e.g. non-transmitted signal or data error) there shall be no distinguishable effect on the service braking performance. 4.1.3. A failure within the electric control transmission, not including its energy reserve, that affects the function and performance of systems addressed in this Regulation shall be indicated to the driver by the red or yellow warning signal specified in points 2.2.1.29.1.1 and 2.2.1.29.1.2 of Annex I, respectively, as appropriate. When the prescribed service braking performance can no longer be achieved (warning signal), failures resulting from a loss of electrical continuity (e.g. breakage, disconnection) shall be signalled to the driver as soon as they occur, and the prescribed residual braking performance shall be fulfilled by operating the service braking control in accordance with point 3.1.4 of Annex II. The manufacturer shall provide the Technical Service with an analysis of potential failures within the control transmission and their effects. This information shall be subject to discussion and agreement between the Technical Service and the vehicle manufacturer. These requirements shall not be construed as a departure from the requirements concerning secondary braking. 4.1.4. A tractor electrically connected to a towed vehicle via an electric control line, shall provide a clear warning to the driver whenever the towed vehicle provides the failure information that the stored energy in any part of the service braking system on the towed vehicle falls below the warning level, as specified in point 5.2.4. A similar warning shall also be provided when a continuous failure (> 40 ms) within the electric control transmission of the towed vehicle, excluding its energy reserve, precludes achievement of the prescribed service braking performance of the towed vehicle, as specified in point 4.2.3. The warning signal specified in point 2.2.1.29.2.1 of Annex I shall be used for this purpose. 4.1.5. In the event of a failure of the energy source of the electric control transmission, starting from the nominal value of the energy level, the full control range of the service braking system shall be guaranteed after twenty consecutive full stroke actuations of the service braking control device. During the test, the braking control device shall be fully applied for 20 seconds and released for 5 seconds on each actuation. It should be understood that during the above test, sufficient energy is available in the energy transmission to ensure full actuation of the service braking system. This requirement shall not be construed as a departure from the requirements of Annex IV. 4.1.6. When the battery voltage falls below a value nominated by the manufacturer at which the prescribed service braking performance can no longer be guaranteed and/or which precludes at least two independent service braking circuits from each achieving the prescribed secondary or residual braking performance, the warning signal specified in point 2.2.1.29.1.1 of Annex I shall be activated. After the warning signal has been activated, it shall be possible to apply the service braking control device and obtain at least the performances prescribed for residual and secondary braking in the case of tractor with maximum design speed exceeding 60 km/h or the performance prescribed for secondary braking in the case of tractor with maximum design speed not exceeding 60 km/h. It should be understood that sufficient energy is available in the energy transmission of the service braking system. This requirement shall not be construed as a departure from the requirement concerning secondary braking. 4.1.7. If auxiliary equipment is supplied with energy from the same reserve as the electric control transmission, it shall be ensured that, with the engine running at a speed not greater than 80 % of the maximum power speed, the supply of energy is sufficient to fulfil the prescribed deceleration values by either provision of an energy supply which is able to prevent discharge of this reserve when all auxiliary equipment is functioning or by automatically switching off pre-selected parts of the auxiliary equipment at a voltage above the critical level referred to in point 4.1.6 such that further discharge of this reserve is prevented. Compliance may be demonstrated by calculation or by a practical test. For vehicles authorised to tow a vehicle of category R3b or R4b the energy consumption of the towed vehicle shall be taken into account by a load of 400 W. This point does not apply to vehicles where the prescribed deceleration values can be reached without the use of electrical energy. 4.1.8. If the auxiliary equipment is supplied with energy from the electric control transmission, the following requirements shall be fulfilled. 4.1.8.1. In the event of a failure in the energy source, whilst the vehicle is in motion, the energy in the reservoir shall be sufficient to actuate the brakes when the control device is applied. 4.1.8.2. In the event of a failure in the energy source, whilst the vehicle is stationary and the parking braking system applied, the energy in the reservoir shall be sufficient to actuate the lights even when the brakes are applied. 4.1.9. In the case of a failure in the electric control transmission of the service braking system of a tractor equipped with an electric control line according to point 2.1.4.1.2 or 2.1.4.1.3 of Annex I, the full actuation of the brakes of the towed vehicle shall remain ensured. 4.1.10. In the case of a failure in the electric control transmission of a towed vehicle, electrically connected via an electric control line only, according to point 2.1.4.1.3 of Annex I, braking of the towed vehicle shall be ensured according to point 2.2.1.17.3.1 of Annex I. This shall be the case whenever the towed vehicle provides the ‘supply line braking request’ signal via the data communication part of the electric control line or in the event of the continuous absence of this data communication. This point shall not apply to tractors which cannot be operated with towed vehicles connected via an electric control line only, as described in point 3.4. 4.2. Trailers 4.2.1. In the case of a single temporary failure (< 40 ms) within the electric control transmission, excluding its energy supply, (e.g. non-transmitted signal or data error) there shall be no distinguishable effect on the service braking performance. 4.2.2. In the case of a failure within the electric control transmission (e.g. breakage, disconnection), of at least 30 % of the prescribed performance for the service braking system of the relevant towed vehicle shall be maintained. Until uniform test procedures have been agreed, the manufacturer shall provide the Technical Service with an analysis of potential failures within the control transmission, and their effects. This information shall be subject to discussion and agreement between the Technical Service and the vehicle manufacturer. For towed vehicles, electrically connected via an electric control line only, according to point 2.1.4.1.3 of Annex I, and fulfilling 2.2.1.17.3.2 of Annex I with the performance prescribed in point 3.2.3 of Annex II, it is sufficient that the provisions of point 4.1.10 are invoked, when a braking performance of at least 30 % of the prescribed performance for the service braking system of the towed vehicle can no longer be ensured, by either providing the ‘supply line braking request’ signal via the data communication part of the electric control line or by the continuous absence of this data communication. 4.2.3. A failure within the electric control transmission of the towed vehicle that affects the function and performance of systems addressed by this Regulation and failures of energy supply available from the ISO 7638:2003 connector shall be indicated to the driver by the separate warning signal specified in point 2.2.1.29.2 of Annex I via pin 5 of the electrical connector conforming to ISO 7638:2003. In addition, towed vehicles equipped with an electric control line, when electrically connected to a tractor with an electric control line, shall provide the failure information for activation of the warning signal specified in point 2.2.1.29.2.1 of Annex I via the data communication part of the electric control line, when the prescribed service braking performance of the towed vehicle can no longer be ensured. However, in the case of any failure of the energy supply available from the ISO 7638:2003 connector, the indication of the yellow warning signal via pin 5 of the electrical connector conforming to ISO 7638:2003 is sufficient under the condition that the full braking force is still available. 5. Additional requirements 5.1. Tractors 5.1.1. Generation of a braking signal to illuminate stop lamps 5.1.1.1. Activation of the service braking system by the driver shall generate a signal that will be used to illuminate the stop lamps. 5.1.1.2. Requirements for vehicles that utilise electronic signalling to control initial application of the service braking system and equipped with an endurance braking system: Deceleration by the endurance braking system ≤ 1,3 m/sec 2 > 1,3 m/sec 2 May generate the signal Shall generate the signal 5.1.1.3. In the case of vehicles equipped with a braking system of a specification different to that laid down in point 5.1.1.2, the operation of the endurance braking system may generate the signal irrespective of the deceleration produced. 5.1.1.4. The signal shall not be generated when deceleration is produced by the natural braking effect of the engine alone. 5.1.1.5. Activation of the service braking system by automatically commanded braking shall generate the signal mentioned above. However, when the deceleration generated is less than 0,7 m/s 2 , the signal may be suppressed At the time of type approval, compliance with this requirement shall be confirmed by the vehicle manufacturer. 5.1.1.6. Activation of part of the service braking system by selective braking shall not generate the signal mentioned above. During a selective braking event, the function may change to automatically commanded braking. 5.1.1.7. In the case of vehicles equipped with an electric control line the signal shall be generated by the tractor when a message ‘illuminate stop lamps’ is received via the electric control line from the towed vehicle. 5.2. Towed vehicles 5.2.1. Whenever power supplied by the ISO 7638:2003 connector is used for the functions referred to in point 2.1, the braking system shall have priority and be protected from an overload external to the braking system. This protection shall be a function of the braking system. 5.2.2. In the case of a failure in one of the control lines connecting two vehicles equipped according to point 2.1.4.1.2 of Annex I the towed vehicle shall use the control line not affected by the failure to ensure, automatically, the braking performance prescribed for the towed vehicle in point 3.2.1 of Annex II. 5.2.3. When the supply voltage to the towed vehicle falls below a value nominated by the manufacturer at which the prescribed service braking performance can no longer be guaranteed, the separate yellow warning signal specified in point 2.2.1.29.2 of Annex I shall be activated via pin 5 of the ISO 7638:2003 connector. In addition, towed vehicles equipped with an electrical control line, when electrically connected to a tractor with an electric control line, shall provide the failure information for actuation of the warning signal specified in point 2.2.1.29.2.1 of Annex I via the data communication part of the electric control line. 5.2.4. When the stored energy in any part of the service braking system of a towed vehicle equipped with an electric control line and electrically connected to a tractor with an electronic control line, falls to the value determined in accordance with point 5.2.4.1, a warning shall be provided to the driver of the tractor. The warning shall be provided by activation of the red signal specified in point 2.2.1.29.2.1 of Annex I and the towed vehicle shall provide the failure information via the data communication part of the electric control line. The separate yellow warning signal specified in point 2.2.1.29.2 of Annex I shall also be activated via pin 5 of the electrical connector conforming to ISO 7638:2003, to indicate to the driver that the low-energy situation is on the towed vehicle. 5.2.4.1. The low energy value referred to in point 5.2.4 shall be that at which, without re-charging of the energy reservoir and irrespective of the load condition of the towed vehicle, it is not possible to apply the service braking control device a fifth time after four full-stroke actuations and obtain at least 50 % of the prescribed performance of the service braking system of the relevant towed vehicle. 5.2.5. Activation of the service braking system 5.2.5.1. In the case of towed vehicles equipped with an electric control line the message ‘illuminate stop lamps’ shall be transmitted by the towed vehicle via the electric control line when the towed vehicle braking system is activated during ‘automatically commanded braking’ initiated by the towed vehicle. However, when the retardation generated is less than 0,7 m/s 2 , the signal may be suppressed. At the time of type approval, compliance with this requirement shall be confirmed by the vehicle manufacturer. 5.2.5.2. In the case of towed vehicles equipped with an electric control line the message ‘illuminate stop lamps’ shall not be transmitted by the towed vehicle via the electrical control line during selective braking initiated by the towed vehicle. During a selective braking event, the function may change to automatically commanded braking. 6. Suppression of automatic braking In the case of towed vehicles equipped with an electric control line and electrically connected to a tractor with an electric control line the automatic braking action specified in point 2.2.1.17.2.2 of Annex I may be suppressed as long as the pressure in the compressed air reservoirs of the towed vehicle is sufficient to ensure the braking performance specified in point 3.2.3 of Annex II.