Document ID: chunk:federal_register_of_legislation:F2017L01221:body:0:p7
Version: federal_register_of_legislation:F2017L01221
Segment Type: other
Provision Reference: 
Character Range: 18299–20911

Applicable as specified in paragraph 8.2.5.
7.2.3. Details on analogue and digital data processing of the BAS test procedures are described in Annex 4 to this Regulation. A sampling rate for data acquisition of at least 500 Hz is required.
7.2.4. Alternative measuring methods to those referred to in paragraph 7.2.3. may be allowed, provided they demonstrate at least an equivalent level of precision.
7.3. Test conditions
7.3.1. Test vehicle loading condition: The vehicle shall be unladen. There may be, in addition to the driver, a second person on the front seat who is responsible for noting the results of the tests.
7.3.2. Braking tests shall be carried out on a dry surface affording good adhesion.
7.4. Test method
7.4.1. The tests as described in paragraphs 8. and 9. of this section shall be carried out from a test speed of 100 ± 2 km/h. The vehicle shall be driven at the test speed in a straight line.
7.4.2. The average temperature of the service brakes on the hottest axle of the vehicle, measured inside the brake linings or on the braking path of the disc or drum, shall be between 65 and 100°C prior to any brake application.
7.4.3. For the tests the reference time, t0, is defined as the moment when the brake pedal force reaches 20 N.
 Note: For vehicles equipped with a brake system assisted by an energy source, the applied pedal force necessary depends on the energy level that exists in the energy storage device. Therefore, sufficient energy level shall be ensured at the beginning of the test.
8. Assessment of the presence of a category "A" BAS
 A category "A" BAS shall meet the test requirements contained in paragraphs 8.1. and 8.2.
8.1. Test 1: Reference test to determine FABS and aABS.
8.1.1. The reference values FABS and aABS shall be determined in accordance with the procedure described in Annex 3 to this Regulation.
8.2. Test 2: For activation of BAS
8.2.1. Once an emergency braking condition has been detected, systems sensitive to pedal force shall show a significant increase in the ratio of:
(a) Brake line pressure to brake pedal force, where permitted by paragraph 8.2.5.; or
(b) Vehicle deceleration to brake pedal force.
8.2.2. The performance requirements for a category "A" BAS are met if a specific brake application characteristic can be defined that exhibits a decrease of between 40 per cent and 80 per cent in required brake pedal force for (FABS - FT) compared to (FABS extrapolated - FT).
8.2.3. FT and aT are threshold force and threshold deceleration as shown in Figure 1. The values of FT and aT shall be supplied to the Technical Service at the time