Regulation No. 139-00 Proposal

Name:Regulation No. 139-00 Proposal
Description:Regulation on Brake Assist Systems (BAS) - Proposal.
Official Title:Uniform Provisions Concerning the Approval of Passenger Cars with Regard to Brake Assist Systems (BAS) - Proposal.
Country:ECE - United Nations
Date of Issue:2016-04-07
Amendment Level:Original
Number of Pages:22
Information:Published as Regulation No. 139-00
Vehicle Types:Car, Light Truck
Subject Categories:Drafts and Proposals (Historical)
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Keywords:

approval, vehicle, regulation, brake, pedal, bas, system, force, type, deceleration, requirements, paragraph, category, time, annex, assist, test, data, maximum, order, technical, means, braking, granted, mass, abs, systems, manufacturer, tests, approved, speed, figure, vehicles, number, line, extension, frequency, paragraphs, pressure, applied, filter, production, communication, range, signals, authority, sampling, mark, modification, service

Text Extract:

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ECE/TRANS/WP.29/2016/61
PROPOSAL FOR A NEW REGULATION ON
BRAKE ASSIST SYSTEMS (BAS)
(ECE 139-00)
ADOPTED AT THE 169 SESSION – JUNE 2016
PROVISIONAL DATE OF ENTRY INTO FORCE: JANUARY 22, 2017

PROPOSAL FOR A NEW REGULATION ON
BRAKE ASSIST SYSTEMS (BAS)
(ECE 139-00)
1. SCOPE
1.1.
This Regulation applies to the approval of vehicles of category M and N
with regard to
their brake assist system.
1.2. This Regulation does not cover:
1.2.1. Vehicles with a design speed not exceeding 25km/h;
1.2.2. Vehicles fitted for invalid drivers.
2. DEFINITIONS
For the purposes of this Regulation,
2.1. "Approval of a vehicle" means the approval of a vehicle type with regard to brake assist
system.
2.2. "Vehicle type" means a category of vehicles which do not differ in such essential respects
as:
2.2.1. The Manufacturer's Trade Name or Mark;
2.2.2. Vehicle features which significantly influence the performances of the Brake Assist System
(e.g. design of the braking system);
2.2.3. The Design of the Brake Assist System.
2.3. "Maximum mass" means the maximum mass stated by the vehicle manufacturer to be
technically permissible (this mass may be higher than the "permissible maximum mass" laid
down by the national administration).
2.4. "The distribution of mass among the axles" means the distribution of the effect of the
gravity on the mass of the vehicle and/or its contents among the axles.
2.5. "Wheel/axle load" means the vertical static reaction (force) of the road surface in the
contact area on the wheel/wheels of the axle.

4.3. Notice of approval or of refusal of approval of a vehicle type pursuant to this Regulation
shall be communicated to the Contracting Parties to the Agreement which apply this
Regulation by means of a form conforming to the model in Annex 1 to this Regulation and of
a summary of the information contained in the documents referred to in Paragraphs 3.2.1. to
3.2.4. above, the drawings supplied by the applicant for approval being in a format not
exceeding A4 (210 × 297 mm), or folded to that format, and on an appropriate scale.
4.4. There shall be affixed, conspicuously and in a readily accessible place specified on the
approval form, to every vehicle conforming to a vehicle type approved under this Regulation,
an international approval mark consisting of:
4.4.1. A circle surrounding the letter "E" followed by the distinguishing number of the country which
has granted approval, and of
4.4.2. The number of this Regulation, followed by the letter "R", a dash and the approval number
to the right of the circle prescribed in Paragraph 4.4.1. above.
4.5. If the vehicle conforms to a vehicle type approved under one or more other Regulations,
annexed to the Agreement, in the country which has granted approval under this
Regulation, the symbol prescribed in Paragraph 4.4.1. above, need not be repeated; in such
a case, the Regulation and approval numbers and the additional symbols of all the
regulations under which approval has been granted in the country which has granted
approval under this Regulation shall be placed in vertical columns to the right of the symbol
prescribed in Paragraph 4.4.1. above.
4.6. The approval mark shall be clearly legible and be indelible.
4.7. The approval mark shall be placed close to or on the vehicle data plate.
4.8. Annex 2 to this Regulation gives examples of arrangements of approval marks.
5. GENERAL REQUIREMENTS
5.1. Vehicles equipped with a brake assist system shall meet the functional requirements
specified in Paragraph 6. of this Regulation. Compliance with these requirements shall be
demonstrated by meeting the provisions of Paragraphs 8. or 9. of this Regulation under the
test requirements specified in Paragraph 7. of this Regulation. In addition to the
requirements of this Regulation, vehicles equipped with a brake assist system shall also be
equipped with ABS in accordance with technical requirements of Regulation 13-H.
5.2. The BAS shall be so designed, constructed and fitted as to enable the vehicle in normal
use, despite the vibration to which it may be subjected, to comply with the provisions of this
Regulation.
5.3. In particular, the BAS shall be so designed, constructed and fitted as to be able to resist the
corroding and ageing phenomena to which it is exposed.

7. GENERAL TEST REQUIREMENTS
7.1. Variables
While performing the tests described in this Regulation, the following variables shall be
measured:
7.1.1. Brake pedal force, F ;
7.1.2. Vehicle velocity, v ;
7.1.3. Vehicle deceleration, a ;
7.1.4. Brake temperature, T ;
7.1.5. Brake pressure, P, where applicable;
7.1.6. Brake pedal speed, v , measured at the centre of the pedal plate or at a position on the
pedal mechanism where the displacement is proportional to the displacement at the centre
of the pedal plate allowing simple calibration of the measurement.
7.2. Measuring Equipment
7.2.1. The variables listed in Paragraph 7.1. above shall be measured by means of appropriate
transducers. Accuracy, operating ranges, filtering techniques, data processing and other
requirements are described in ISO Standard 15037-1: 2006.
7.2.2. Accuracy of pedal force and disc temperature measurements shall be as follows:
Variable Range System
Typical operating range of
the transducers
Recommended maximum
recording errors
Pedal force 0 to 2,000N ±10 N
Brake temperature 0 – 1,000°C ±5°C
Brake pressure 0 – 20MPa ±100kPa
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 500Hz 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.

Figure 1a
Pedal Force Characteristic Needed in Order to Achieve Maximum Deceleration
with Category "A" BAS
8.2.4. A straight line is drawn from the origin through the point F , a (as shown in Figure 1a). The
value of brake pedal force "F", at the point of intersection between this line and a horizontal
line defined by a = a , is defined as F , :
F
F
=
⋅ a
a
8.2.5. As an alternative, which can be selected by the manufacturer, in the case of vehicles of
Category N , or M derived from those N vehicles, with a gross vehicle mass
GVM > 2,500kg, the pedal force figures for F , F , F and F may be
derived from the brake line pressure response characteristic instead of the vehicle
deceleration characteristic. This shall be measured as the brake pedal force is increasing.
8.2.5.1. The pressure, at which ABS cycling commences, shall be determined by making five tests
from 100 ± 2km/h in which the brake pedal is applied up to the level which produces ABS
operation and the five pressures at which this occurs as determined from front wheel
pressure records, shall be recorded and the mean value obtained as P .
8.2.5.2. The threshold pressure P shall be stated by the manufacturer and correspond to a
deceleration in the range of 2.5 - 4.5m/s .

9.1. Test 1: Reference test to determine F and a .
9.1.1. The reference values F and a shall be determined in accordance with the procedure
described in Annex 3 to this Regulation.
9.2. Test 2: For Activation of BAS
The vehicle shall be driven in a straight line at the test speed specified in Paragraph 7.4. of
this Regulation. The driver shall apply the brake pedal quickly according to Figure 2,
simulating emergency braking so that BAS is activated and ABS is fully cycling.
In order to activate BAS the brake pedal shall be applied as specified by the car
manufacturer. The manufacturer shall notify the Technical Service of the required brake
pedal input at the time of submission of the application for type-approval. It shall be
demonstrated to the satisfaction of the Technical Service that the BAS activates under the
conditions specified by the manufacturer in accordance with Paragraph 16.1.1. or 16.1.2. of
Annex 1.
After t = t + 0.8s and until the vehicle has slowed down to a speed of 15km/h, the brake
pedal force shall be maintained in a corridor between F , and F , , where
F , is 0.7 F and F , is 0.5 F .
The requirements are also considered to be met if, after t = t + 0.8s, the pedal force falls
below F provided the requirement of Paragraph 9.3. is fulfilled.
9.3. Data Evaluation
The presence of BAS 'B' is demonstrated if a mean deceleration (a ) of at least
0.85 · a is maintained from the time when t = t + 0.8 s to the time when the vehicle
speed has been reduced to 15km/h.
Figure 2
Example of Test 2 of a Category "B" BAS System

11. CONFORMITY OF PRODUCTION
The conformity of production procedures shall comply with those set out in the Agreement,
Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2) with the following requirements:
11.1. A vehicle approved to this Regulation shall be so manufactured as to conform to the type
approved by meeting the requirements set forth in Paragraphs 5. and 6. above.
11.2. The authority which has granted type approval may at any time verify the conformity control
methods applied in each production facility. The normal frequency of these verifications
shall be once every two years.
12. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
12.1. The approval granted in respect of a vehicle type pursuant to this Regulation may be
withdrawn if the requirements laid down in Paragraph 11.1. above are not complied with.
12.2. If a Contracting Party to the Agreement which applies this Regulation withdraws an approval
it has previously granted, it shall forthwith so notify the other Contracting Parties applying
this Regulation by means of a copy of the communication form conforming to the model in
Annex 1 to this Regulation.
13. PRODUCTION DEFINITIVELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a type of vehicle approved in
accordance with this Regulation, they shall so inform the authority which granted the
approval. Upon receiving the relevant communication, that authority shall inform thereof the
other Contracting Parties to the Agreement applying this Regulation by means of copies of a
communication form conforming to the model in Annex 1 to this Regulation.
14. NAMES AND ADDRESSES OF THE TECHNICAL SERVICES CONDUCTING APPROVAL
TESTS, AND OF TYPE APPROVAL AUTHORITIES
The Contracting Parties to the Agreement applying this Regulation shall communicate to the
United Nations secretariat the names and addresses of the Technical Services responsible
for conducting approval tests and of the Type Approval Authorities which grant approval and
to which forms, certifying approval or extension or refusal or withdrawal of approval, issued
in other countries, are to be sent.

10. Final drive ratio(s) ..........................................................................................................................
11. If applicable, maximum mass of trailer which may be coupled ......................................................
11.1. Unbraked trailer ..............................................................................................................................
12. Tyre dimension ...............................................................................................................................
13. Maximum design speed .................................................................................................................
14. Brief description of braking equipment ...........................................................................................
15. Mass of vehicle when tested: .........................................................................................................
Axle No. 1
Axle No. 2
Total
16.1. Category of Brake Assist System A/B
Load
(kg)
16.1.1. For Category A systems, define the force threshold at which the ratio between pedal force and
brake pressure increases ; ...........................................................................................................
16.1.2. For Category B systems, define the brake pedal speed which must be achieved in order to
activate the Brake Assist System (e.g. pedal stroke speed (mm/s) during a given time
interval); ........................................................................................................................................
17. (Reserved)
18. Vehicle is equipped with ABS in accordance with technical requirements of
Regulation No.13-H .......................................................................................................... Yes/No
19. Vehicle submitted for approval on ..................................................................................................
20. Technical Service responsible for conducting approval .................................................................
21. Date of report issued by that Service .............................................................................................
22. Number of report issued by that Service ........................................................................................
23. Approval granted/refused/extended/withdrawn

ANNEX 2
ARRANGEMENTS OF APPROVAL MARKS
Model A
(See Paragraph 4.4. of this Regulation)
a = 8mm min.
The above approval mark affixed to a vehicle shows that the vehicle type concerned has been approved
in Belgium (E 6) with regard to the Brake Assist System pursuant to Regulation No. YYY. The first two
digits of the approval number indicate that the approval was granted in accordance with the requirements
of Regulation No. YYY in its original form.
Model B
(See Paragraph 4.5. of this Regulation)
a = 8mm min.
The above approval mark affixed to a vehicle shows that the vehicle type concerned has been approved
in Belgium (E 6) pursuant to Regulations Nos. YY and 24 . (In the case of the latter Regulation the
corrected absorption coefficient is 1.30m ). The approval numbers indicate that, at the dates when the
respective approvals were given, Regulation No. YY was in its original form and Regulation No. 24
included the 02 series of amendments.

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 1N pedal force. The result is the mean deceleration versus brake
pedal force curve, which will be referred to as the "maF curve" in this annex.
1.7. The maximum value for the vehicle deceleration is determined from the "maF curve" and is
named as "a ".
1.8. All values of the "maF curve" that are above 90% of this deceleration value "a " are
averaged. This value of "a" is the deceleration "a " referred to in this Regulation.
1.9. The minimum force on the pedal (F ) sufficient to achieve the deceleration a is defined
as the value of F corresponding to a = a on the maF curve.

The minimum filter characteristics and sampling rate shall be such that:
(a)
Within the relevant frequency range of 0Hz to f
= 30Hz the attenuation is less than
the resolution of the data acquisition system; and
(b)
At one-half the sampling rate (i.e. the Nyquist or "folding" frequency) the magnitudes
of all frequency components of signal and noise are reduced to less than the system
resolution.
For 0.05% resolution the filter attenuation shall be less than 0.05% in the frequency range
between 0 and 30Hz, and the attenuation shall be greater than 99.95% at all frequencies
greater than one-half the sampling frequency.
Note: For a Butterworth filter the attenuation is given by:
A
=
f
1+



1
f



and
A
1
=
f
1+


⎝ f



where:
n
is the order to filter;
f is the relevant frequency range (30Hz);
f
f
is the filter cut-off frequency;
is the Nyquist or "folding" frequency.
For a fourth order filter
for A = 0.9995: f = 2.37 · f
for A = 0.0005: f , = 2 · (6.69 · f ), where f , is the sampling frequency = 2 · f .
2.3. Filter Phase Shifts and Time Delays for Anti-aliasing Filtering
Excessive analogue filtering shall be avoided, and all filters shall have sufficiently similar
phase characteristics to ensure that time delay differences are within the required accuracy
for the time measurement. Phase shifts are especially significant when measured variables
are multiplied together to form new variables, because while amplitudes multiply, phase
shifts and associated time delays add. Phase shifts and time delays are reduced by
increasing f . Whenever equations describing the pre-sampling filters are known, it is
practical to remove their phase shifts and time delays by simple algorithms performed in the
frequency domain.

Regulation on Brake Assist Systems (BAS) - Proposal.