Regulation No. 139-00

Name:Regulation No. 139-00
Description:Brake Assist Systems (BAS) - Passenger Cars.
Official Title:Uniform Provisions Concerning the Approval of Passenger Cars with Regard to Brake Assist Systems (BAS).
Country:ECE - United Nations
Date of Issue:2017-01-30
Amendment Level:Original
Number of Pages:24
Vehicle Types:Car, Light Truck
Subject Categories:Braking
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Keywords:

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Text Extract:

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E/ECE/324
) Rev.2/Add.138
E/ECE/TRANS/505 )
January 30, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 139-00
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
PASSENGER CARS WITH REGARD TO BRAKE ASSIST SYSTEMS (BAS)
Incorporating:
00 series of amendments Date of Entry into Force: 22.01.17

REGULATION
1. Scope
2. Definitions
REGULATION NO. 139-00
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF
PASSENGER CARS WITH REGARD TO BRAKE ASSIST SYSTEMS (BAS)
3. Application for Approval
4. Approval
5. General Requirements
6. Functional Requirements
7. General Test Requirements
CONTENTS
8. Assessment of the Presence of a Category "A" BAS
9. Assessment of the Presence of a Category "B" BAS
10. Modification of Vehicle Type or Braking System and Extension of Approval
11. Conformity of Production
12. Penalties for Non-conformity of Production
13. Production Definitively Discontinued
14. Names and Addresses of Technical Services Responsible for Conducting Approval Tests,
and of Type Approval Authorities
ANNEXES
Annex 1
Annex 2
Communication
Arrangements of Approval Marks
Annex 3 Method for Determination of F and a
Annex 4
Data Processing for the BAS

2.6. "Brake Assist System (BAS)" means a function of the braking system that deduces an
emergency braking event from a characteristic of the driver's brake demand and, under
such conditions:
(a)
(b)
Assists the driver to deliver the maximum achievable braking rate; or
Is sufficient to cause full cycling of the Anti-lock Braking System.
2.6.1. "Category A Brake Assist System" means a system which detects an emergency braking
condition based primarily on the brake pedal force applied by the driver;
2.6.2. "Category B Brake Assist System" means a system which detects an emergency braking
condition based primarily on the brake pedal speed applied by the driver;
3. APPLICATION FOR APPROVAL
3.1. The application for approval of a vehicle type with regard to BAS shall be submitted by the
vehicle manufacturer or by their duly accredited representative.
3.2. It shall be accompanied by the under-mentioned documents in triplicate and by the following
particulars:
3.2.1. A description of the vehicle type with regard to the items specified in Paragraph 2.2. above.
The numbers and/or symbols identifying the vehicle type and the engine type shall be
specified;
3.2.2. A list of the components, duly identified, constituting the BAS system;
3.2.3. A diagram of the assembled BAS system and an indication of the position of its components
on the vehicle;
3.2.4. Detailed drawings of each component to enable it to be easily located and identified.
3.3. A vehicle, representative of the vehicle type to be approved, shall be submitted to the
Technical Service conducting the approval tests.
4. APPROVAL
4.1. If the vehicle type submitted for approval pursuant to this Regulation meets the
requirements of Paragraphs 5. and 6. below, approval of that vehicle type shall be granted.
4.2. An approval number shall be assigned to each type approved, its first two digits shall
indicate the series of amendments incorporating the most recent major technical
amendments made to the Regulation at the time of issue of the approval. The same
Contracting Party shall not assign the same number to another vehicle type with regard to
Brake Assist System.

5.4. The effectiveness of the BAS shall not be adversely affected by magnetic or electrical fields.
This shall be demonstrated by fulfilling the technical requirements and respecting the
transitional provisions of Regulation No. 10 by applying:
(a)
(b)
The 03 series of amendments for vehicles without a coupling system for charging the
Rechargeable Electric Energy Storage System (traction batteries);
The 04 series of amendments for vehicles with a coupling system for charging the
Rechargeable Electric Energy Storage System (traction batteries).
5.5. The assessment of the safety aspects of BAS shall be included in the overall safety
assessment of the braking system as specified in Regulation No. 13-H requirements
associated with complex electronic control systems. This is deemed to be fulfilled on the
presentation of a Regulation No. 13-H certificate which includes the BAS to be approved.
5.6. Provisions for the Periodic Technical Inspection of Electronic Brake Assist Systems
5.6.1. It shall be possible at a periodic technical inspection to confirm the correct operational status
by visual observation of the warning signals following a power-on.
5.6.2. At the time of type approval, the means implemented to protect against simple unauthorized
modification of the operation of the warning signals shall be confidentially outlined.
Alternatively, this protection requirement is fulfilled when a secondary means of checking
the correct operational status is available.
6. FUNCTIONAL REQUIREMENTS
6.1. General Performance Characteristics for Category "A" BAS Systems
When an emergency condition has been sensed by a relative high pedal force, the
additional pedal force to cause full cycling of the ABS shall be reduced compared to the
pedal force required without the BAS system in operation.
Compliance with this requirement is demonstrated if the provisions of Paragraphs 8.1. to
8.3. of this Regulation are met.
6.2. General Performance Characteristics for Category "B" BAS Systems
When an emergency condition has been sensed, at least by a very fast application of the
pedal, the BAS system shall raise the pressure to deliver the maximum achievable braking
rate or cause full cycling of the ABS.
Compliance with this requirement is demonstrated if the provisions of Paragraphs 9.1. to
9.3. of this Regulation are met.

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 ± 2km/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, t , is defined as the moment when the brake pedal force
reaches 20N.
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 F and a
8.1.1. The reference values F and a 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)
(b)
Brake line pressure to brake pedal force, where permitted by Paragraph 8.2.5.; or
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% and 80%
in required brake pedal force for (F - F ) compared to (F - F ).
8.2.3. F and a are threshold force and threshold deceleration as shown in Figure 1. The values
of F and a shall be supplied to the Technical Service at the time of submission of the
type-approval application. The value of a shall be between 3.5m/s and 5.0m/s .

8.2.5.3. Figure 1b shall be constructed in the manner set out in Paragraph 8.2.4., but using line
pressure measurements to define the parameters set out in Paragraph 8.2.5. of this
Regulation where:
F
F
=
⋅ P
P
Figure 1b
8.3. Data Evaluation
Pedal Force Characteristic Needed in Order to Achieve
Maximum Deceleration with Category "A" BAS
The presence of a Category "A" BAS is proven if
F ≤ F ≤ F
where:
F - F ≤ (F – F ) ⋅ 0.6
and
F - F ≥ (F – F ) ⋅ 0.2

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 + 0.8s 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
10. MODIFICATION OF VEHICLE TYPE OR BAS AND EXTENSION OF APPROVAL
10.1. Every modification to an existing vehicle type shall be notified to the Type Approval
Authority which approved the vehicle type.
The Authority shall then either:
(a)
(b)
Decide, in consultation with the manufacturer, that a new type-approval is to be
granted; or
Apply the procedure contained in Paragraph 10.1.1. (Revision) and, if applicable, the
procedure contained in Paragraph 10.1.2. (Extension).

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. 139. The first two
digits of the approval number indicate that the approval was granted in accordance with the requirements
of Regulation No. 139 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. 139 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. 139 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.

2.2. Aliasing Errors
In order to avoid uncorrectable aliasing errors, the analogue signals shall be appropriately
filtered before sampling and digitizing. The order of the filters used and their pass band shall
be chosen according to both the required flatness in the relevant frequency range and the
sampling rate.
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 .

Brake Assist Systems (BAS) - Passenger Cars.