Document ID: chunk:federal_register_of_legislation:F2018C00341:body:0:p47
Version: federal_register_of_legislation:F2018C00341
Segment Type: other
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Character Range: 134608–137343

3 has its origin at the time t0 crossing the aABS line 2 seconds. Once full deceleration has been achieved, the brake pedal shall be operated so that the ABS continues fully cycling. The time of full activation of the ABS system is defined as the time when pedal force FABS is achieved. The measurement shall be within the corridor for variation of increase in deceleration (see Figure 3).

       Figure 3
       Deceleration corridor for determination of FABS and aABS

       1.4. Five tests meeting the requirements of paragraph 1.3. shall be carried out. For each of these valid tests the vehicle deceleration shall be plotted as a function of the recorded brake pedal force. Only data recorded at speeds above 15 km/h shall be taken for the calculations described in the following paragraphs.

       1.5. For the determination of aABS and FABS, a low pass filter of 2 Hz for vehicle deceleration as well as pedal force shall be applied.

       1.6. The five individual "deceleration versus brake pedal force" curves are averaged by calculating the mean deceleration of the five individual "deceleration vs. brake pedal force" curves at increments of 1 N pedal force. The result is the mean deceleration versus brake pedal force curve, which will be referred to as the "maF curve" in this appendix.

       1.7. The maximum value for the vehicle deceleration is determined from the "maF curve" and is named as "amax".

       1.8. All values of the "maF curve" that are above 90 per cent of this deceleration value "amax" are averaged. This value of "a" is the deceleration "aABS" referred to in this appendix.

       1.9. The minimum force on the pedal (FABS) sufficient to achieve the deceleration aABS is defined as the value of F corresponding to a= aABS on the maF curve.

Appendix 2 - Attachment 5

         The following is a modified form of Annex 9 – Appendix 5 of UNECE Regulation No. 13-H– UNIFORM PROVISIONS CONCERNING THE APPROVAL OF PASSENGER CARS WITH REGARD TO BRAKING, incorporating supplement 14 to the 00 series of amendments.
Data processing for the BAS
       (see paragraph 2.2.3. of section B of this appendix)

       1. Analogue data processing

        The bandwidth of the entire, combined transducer/recording system shall be no less than 30 Hz.

        In order to execute the necessary filtering of signals, low-pass filters with order 4 or higher shall be employed. The width of the pass band (from 0 Hz to frequency fo at ‑3 dB) shall not be less than 30 Hz. Amplitude errors shall be less than ±0.5 per cent in the relevant frequency range of 0 Hz to 30 Hz. All analogue signals shall be processed with filters having sufficiently similar phase characteristics to ensure that time