Regulation No. 68-00

Name:Regulation No. 68-00
Description:Maximum Speed Measurement.
Official Title:Uniform Provisions Concerning the Approval of: Power-driven Vehicles Including Pure Electric Vehicles with Regard to the Measurement of the Maximum Speed.
Country:ECE - United Nations
Date of Issue:1987-04-15
Amendment Level:00 Series, Supplement 1
Number of Pages:17
Vehicle Types:Car, Light Truck
Subject Categories:Miscellaneous
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Keywords:

vehicle, approval, speed, regulation, maximum, vehicles, type, track, manufacturer, test, electric, measurement, measured, loop, paragraph, time, determined, factor, correction, granted, requirements, length, production, mass, number, conditions, extension, technical, annex, service, engine, regard, tests, wind, accordance, means, mark, straight, approved, form, distance, exceed, procedure, agreement, air, power-driven, series, responsible, measuring, thermal

Text Extract:

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E/ECE/324 )
E/ECE/TRANS/505 ) Rev.1/Add.67/Amend.1
March 21, 1997
STATUS OF UNITED NATIONS REGULATION
ECE 68
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
POWER-DRIVEN VEHICLES INCLUDING PURE ELECTRIC VEHICLES
WITH REGARD TO THE MEASUREMENT OF THE MAXIMUM SPEED
Incorporating:
00 series of amendments
Date of Entry into Force: 01.05.87
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 30.11.96

REGULATION NO. 68
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF POWER-DRIVEN VEHICLES
INCLUDING PURE ELECTRIC VEHICLES WITH REGARD TO THE MEASUREMENT OF THE
MAXIMUM SPEED
REGULATION
1. Scope
2. Definitions
3. Application for Approval
4. Approval
5. Requirements
6. Interpretation of Results
CONTENTS
7. Modifications of the Vehicle Type and Extension of Approval
8. Conformity of Production
9. Penalties for Non-conformity of Production
10. Production Definitely Discontinued
11. Names and Addresses of Technical Services Responsible for Approval Tests, and of
Administrative Departments
ANNEXES
Annex 1 – Communication Concerning the Approval or Refusal or Extension or Withdrawal of Approval
or Production Definitely Discontinued of a Type of Power-driven Vehicle With Regard to the
Measurement of the Maximum Speed, Pursuant to Regulation No. 68
Annex 2 – Examples of Approval Marks
Annex 3 – Procedure for Determining the Correction Factor for Loop Track

3. APPLICATION FOR APPROVAL
3.1. The application for approval of a vehicle type with regard to measurement of the maximum
speed indicated by the manufacturer shall be submitted by the vehicle manufacturer or by
his duly accredited representative.
3.2. It shall be accompanied by the undermentioned documents in triplicate and the following
particulars:
3.2.1. Detailed description of the vehicle type as regards the shape of the bodywork, the engine or
electric drive train (motor(s) and controller(s)), traction battery (type capacity, battery
management) (if any), transmission (if any), tyres and unladen mass of the vehicle;
3.2.2. Drawings and/or photographs of the vehicle's bodywork.
3.3. A vehicle representative of the vehicle type to be approved shall be submitted to the
technical service responsible for conducting the approval tests.
4. APPROVAL
4.1. When the maximum speed of a vehicle submitted for approval under this Regulation has
been measured in accordance with the requirements of Paragraphs 5 and 6 below, this
vehicle type shall be approved.
4.2. An approval number shall be assigned to each type-approved. Its first two digits (at present
00 for the Regulation in its original form) 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.
4.3. Notice of approval or of refusal or of extension or withdrawal of approval or production
definitely discontinued of a vehicle type pursuant to this Regulation shall be communicated
to the Parties to the Agreement applying this Regulation, by means of a form conforming to
the model in Annex 1 to this Regulation.
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;
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 described in Paragraph 4.4.1.

The end of charge shall be specified by the vehicle manufacturer, but charging, expressed
in hours (h), shall not last longer than:
where:
3 C
P
C
P
is the battery energy-capacity (Wh), as specified by the manufacturer, and
is the mean power (W), drawn from the mains during charging.
5.2.2.3. All the energy storage systems available for use other than for propelling the vehicle
(electric, hydraulic, pressure, etc) must be charged according to the manufacturer's
recommendations.
5.2.2.4. The vehicle shall have covered a distance of at least 300 km during a period of seven days
preceding the test, using the batteries that will be installed in the vehicle for measuring the
maximum speed.
5.2.2.5. The mass of the vehicle shall be its unladen mass plus half the full load in any case.
5.3. Characteristics of the Test Track
The measurement shall be effected on either:
A straight track in the conditions set out in Paragraph 5.3.1;
and/or
A loop track in the conditions set out in Paragraph 5.3.2.
5.3.1. Measurement on Straight Track
5.3.1.1. Surface condition: the surface shall be hard and smooth and give good adhesion.
5.3.1.2. Lengths
5.3.1.2.1. The length L shall be selected in relation to the precision of the apparatus and the method
used for measuring the time t of the run so that the actual speed can be determined within
± 1%. For electric vehicles, the length of the measuring zone shall be at least 1000 m. The
length actually used for the measurement shall be recorded in the report.
5.3.1.2.2. Stabilising zone: the stabilising zone shall be of the same nature as the measuring zone,
approximately straight and of sufficient length for the speed of the vehicle to have stabilised
at its maximum by the time the vehicle reaches the measuring zone.
5.3.1.3. Slopes
5.3.1.3.1. Longitudinal: in the stabilising and the measuring zones, the longitudinal slopes shall not
exceed 0.5%.
5.3.1.3.2. Transverse: the transverse slope shall not exceed 3%.

5.4.2. Wind
The average wind speed measured at a height of 1 m above the ground shall be less than
3 m/s; gusts shall be less than 5 m/s.
5.4.3. Relative Humidity
The relative humidity shall be less than 95% and the track shall be dry.
5.5. Test Method
5.5.1. Warming-up
5.5.1.1. Warming up for thermal engine driven vehicles.
5.5.1.1.1. Immediately before the test, the parts of the vehicle which might affect the measurement
shall be in the stable temperature conditions specified by the manufacturer.
5.5.1.1.2. During measurement, the gear ratio used shall be that in which the vehicle is able to reach
its maximum steady speed. The accelerator shall be fully depressed. Any cold-starting
device or manual choke shall be out of operation.
5.5.1.2. Warming up for electric vehicles:
5.5.1.2.1. After full charging carried out according to Paragraph 5.2.2.2.2., the vehicle must be
conditioned at a temperature ranging from 20° C to 30° C during a minimum period of two
hours.
5.5.1.2.2. After the thermal conditioning and just before the beginning of the test, the vehicle must be
driven on a minimal distance of five kilometres, at a speed equivalent to 80% of the
maximum 30 minutes speed as defined in Paragraph 2.3.
5.5.3. Measurements at the Maximum Speed
The distance covered and the time taken to cover it shall be determined with sufficient
accuracy for the error in the maximum speed not to exceed 1%.
5.5.4. Determination of Maximum Speed on a Straight Track
5.5.4.1. Two-direction test
The time Ti taken to cover the measured length shall be measured. It shall be checked that
the speed does not vary at any moment during the run by more than 2%. This procedure
shall be effected not less than three times in each direction and the variation between the
extreme values of the six "Ti" values recorded shall not exceed 3%.
For electric vehicles, the procedure shall be effected once in each direction.
A time T shall be determined by the formula:
T =
1
6


6
1
Ti

Leaving aside the extreme values of V , the maximum speed V is given by:
V =
1
3

3
1
V
5.5.5. Determination of the Maximum Speed on Loop Track
The time T required for a complete circuit shall be recorded. Not less than three
measurements shall be made with the vehicle following a path corresponding approximately
to that taken at the test speed, i.e. not requiring any correction of course by action on the
steering wheel. The difference between the extreme values measured shall not exceed 3%.
For electric vehicles, the distance covered shall not be less than 2000 metres.
The time T shall be determined by the formula:
1 3
T = ⋅ ∑ T
3 1
The apparent maximum speed shall be determined by the formula:
V
L × 3.6
=
T
where
V = speed in km/h
_
T = time in seconds
L = length of the path actually covered on the loop track, in metres.
The speed V shall then be corrected by an experimentally determined factor specific to the
loop track used and taking into account, in particular, the effects of centrifugal force in the
curves and the consequent changes in the attitude of the vehicle:
V = V x k
where
1.00 ≤ k ≤ 1.05 where k is the correction factor determined in accordance with Annex 3.
5.5.6. Determination of the maximum 30 minutes speed for electric vehicles on a loop track.
After preparation and warming up of the electric vehicle according to the requirements of
Paragraphs 5.2.2. and 5.5.1.2., the test shall be performed at a speed indicated by the
vehicle manufacturer, which can be maintained over thirty minutes with a tolerance of ± 5%.

10. PRODUCTION DEFINITELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a type of vehicle approved in
accordance with this Regulation, he shall so inform the authority which granted the
approval. Upon receiving the relevant communication that authority shall inform thereof the
other Parties to the Agreement applying this Regulation by means of a copy of the approval
form bearing at the end, in large letters, the signed and dated annotation "PRODUCTION
DISCONTINUED".
11. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR
CONDUCTING APPROVAL TESTS, AND OF ADMINISTRATIVE DEPARTMENTS
The 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 administrative departments which grant approval and
to which forms certifying approval or refusal or extension or withdrawal of approval, issued
in other countries, are to be sent.

11. Vehicle submitted for approval on...............................................................................................
12. Technical service responsible for conducting the approval tests ...............................................
....................................................................................................................................................
13. Date of report issued by that service ..........................................................................................
14. Approval granted/refused/extended/withdrawn .......................................................................
15. Reason(s) of extension (if applicable).........................................................................................
16. Number of report issued by that service .....................................................................................
17. Position of approval mark on the vehicle ....................................................................................
....................................................................................................................................................
18. Place ...........................................................................................................................................
19. Date.............................................................................................................................................
20. Signature.....................................................................................................................................
21. The following documents, bearing the approval number shown above, are annexed to this
communication:
.....................................................................................drawings of the vehicle
............................................................................... photographs of the vehicle

ANNEX 3
PROCEDURE FOR DETERMINING THE CORRECTION FACTOR FOR LOOP TRACK
1. The correction factor k for loop track shall be determined up to the maximum permitted
speed.
2. The factor shall be determined for several speeds in such a way that the difference between
two consecutive speeds is not more than 30 km/h.
3. For each speed selected, the test shall be carried out in accordance with the requirements
of this Regulation by both the possible methods:
3.1. Speed measured in a straight line: V
3.2. Speed measured on loop track: V
4. For each speed measured the values V and V shall be plotted on a diagram (Figure 1)
and each consecutive pair of points connected by a straight line.
Figure 1
Maximum Speed Measurement.