UN R13H — 02 series of amendments

New paragraphs 2.26. to 2.37. define terms such as “Electrical storage device”, “Energy Management System” and “Auxiliary equipment”. Paragraph 2.34. defines the “Electrical Transmission Braking System” (ETBS). In this system, the service braking force and transmission depend exclusively on the use, controlled by the driver, of energy from electrical storage devices. “Brake demand value” means the demand value for the braking force of a single wheel, or axle, being electrically actuated. “Electric State of Charge (SOC)” now refers to an electrical storage device, for example a battery or capacitor, and not to the traction battery. A paragraph that had the number 2.35. now has the number 2.24.

New paragraph 5.1.4.3.1. requires the functional and efficiency test data of electrical transmission braking systems on the vehicle, visible and indelible, or freely available elsewhere. For these vehicles, the manufacturer must describe at type approval how to check the detection means for the warnings of paragraphs 5.2.24.6., 5.2.24.7. and 5.2.24.9. New paragraph 5.1.4.4. sets how reference braking forces are defined for an electrical transmission braking system on a roller brake tester. The brake demand values must be displayed on the vehicle and easily readable from the driver's seat during the roller brake test. New paragraph 5.2.7.2. requires a declaration of any compensation that keeps the braking rate of the vehicle related to the driver’s braking demand. Paragraph 5.2.8.1.1. now covers a difference in transverse braking pressures, or wheel brake demand value, on any axle.

In paragraph 5.2.14.1., the warning device gives an optical signal or, except for an electrical transmission braking system, an acoustic signal. For electrical transmission braking systems, the warning comes at the latest when the prescribed service brake performance cannot be achieved. Or it comes when a fifth application after four full actuations can still give at least the secondary braking performance, whichever occurs first. For these systems, paragraph 5.2.14.1.2. adds an acoustic signal within 60 seconds of the red warning signal, or earlier at the first service brake application. Vehicles with an electrical transmission braking system need an ageing indicator for each electrical storage device, with at least four levels above the maintenance level. This indicator is not required for a traction battery that also has the function of an energy storage device.

Under new paragraph 5.2.24.8., an energy management system for the electrical storage devices of the transmission must be capable of continuously assessing them. If the assessment is not complete at switch-on, a red warning signal must stay active until the safe status of the system is confirmed. New warning signals cover the ageing and the state of the electrical storage devices and the electrical supply power (paragraphs 5.2.24.6., 5.2.24.7. and 5.2.24.9.). If auxiliary equipment shares the braking system's electrical storage devices and their supply fails, it must be switched off and/or the vehicle automatically stopped. This must happen before the critical level of paragraph 5.2.14.1.(b), without affecting auxiliary equipment that another safety-related UN Regulation requires. Within 60 seconds of the acoustic warning signal, an automatic function must progressively reduce the vehicle’s speed so that it cannot exceed 20 km/h.

New Part B of Annex 4 covers the performance of electrical storage devices and the capacity of the electrical supply. Under Part B, paragraph 1.2.1., the ninth braking after eight full actuations of the service braking control must at least fulfil the secondary braking requirements. On at least the first actuation, it must be possible to achieve the prescribed performance of the service braking system. The capacity of the electrical supply is assessed with the Type-I and hot performance procedures of Annex 3, with 20 brake actuations. New paragraph 3.1.3. of Annex 3 covers vehicles fitted with an electrical transmission braking system in an emergency manoeuvre. They meet paragraph 3.1.1. if the deceleration at the least favourable brake reaches the prescribed performance level within 0.6 second.

Annex 8 now applies to electronic control systems as well as complex electronic control systems. The Technical Service must assess the analytical approaches, including the safety approach at vehicle and system level and the validation plans and results. The formal documentation package must remain available for a period agreed with the Approval Authority, at least 10 years after vehicle production definitely stops. The manufacturer must keep its confidential material and analysis data available for 10 years after vehicle production is definitely discontinued. Paragraph 4.2. allows simulation tools and mathematical models for verification of the safety concept, under Schedule 8 of Revision 3 of the 1958 Agreement. A new appendix gives a model assessment form for electronic, and/or complex electronic, control systems.

Under new paragraph 12.1., Contracting Parties may grant type approvals to any preceding series, and must continue to grant extensions of existing approvals to them. From the official date of entry into force of the 02 series, approvals for vehicles with an electrical transmission braking system require the 02 series. Paragraph 12.3.3. covers type approvals first issued after 1 September 2028 for vehicle types with a braking system equipped with an electronic control system. From 1 September 2028, Contracting Parties are not obliged to accept such approvals to the preceding series. From 1 September 2030, Contracting Parties are not obliged to accept type approvals issued to the preceding series. But they must continue to accept them for vehicles that are not affected by the changes of the 02 series.