ISO/DIS 1585.2

DRAFT INTERNATIONAL STANDARD ISO/DIS 1585
ISO/TC 22/SC 5 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2006-12-08 2007-05-08

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION

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Foreword .............................................................................................................................................................v

Introduction........................................................................................................................................................vi

1 Scope......................................................................................................................................................1

2 Normative references............................................................................................................................1

3 Terms and definitions ...........................................................................................................................2

4 Accuracy of measuring equipment and instruments ........................................................................2

4.1 Torque.....................................................................................................................................................2

4.2 Engine speed (rotational frequency) ...................................................................................................2

4.3 Fuel flow .................................................................................................................................................3

4.4 Fuel temperature ...................................................................................................................................3

4.5 Air temperature......................................................................................................................................3

4.6 Barometric pressure .............................................................................................................................3

4.7 Back pressure in exhaust system .......................................................................................................3

4.8 Depression in inlet system...................................................................................................................3

4.9 Absolute pressure in inlet duct............................................................................................................3

5 Tests.......................................................................................................................................................7

5.1 Auxiliaries ..............................................................................................................................................7

5.1.1 Auxiliaries to be fitted...........................................................................................................................7

5.1.2 Auxiliaries to be removed.....................................................................................................................7

5.1.3 Compression-ignition engine starting auxiliaries..............................................................................7

5.2 Setting conditions .................................................................................................................................7

5.3 Test conditions ......................................................................................................................................7

5.4 Test procedure.......................................................................................................................................9

5.5 Data to be recorded...............................................................................................................................9

6 Power correction factors ......................................................................................................................9

6.1 Definition of factor α for power correction .........................................................................................9

6.2 Atmospheric conditions .....................................................................................................................10

6.2.1 Reference atmospheric conditions ...................................................................................................10

6.2.2 Test atmospheric conditions .............................................................................................................10

6.3 Determination and applicability of power correction factors .........................................................10

6.3.1 Controlled engine parameters ...........................................................................................................10

6.3.2 Controlled fuel flow and consumption..............................................................................................11

6.3.3 Calculation of correction factors.......................................................................................................11

6.3.4 Other types of engine..........................................................................................................................14

7 Measurement of and correction for smoke value for compression-ignition engines..................14

7.1 Correction factor for light absorption coefficient of smoke ...........................................................14

7.2 Determination of correction factor for light absorption coefficient of smoke..............................15

7.3 Limits of application............................................................................................................................15

8 Test report............................................................................................................................................15

8.1 Compression-ignition engines – Essential characteristics ............................................................15

8.1.1 Description of engine..........................................................................................................................15

8.1.2 Additional smoke control devices (if any, and if not covered by another heading) ..........................17

8.1.3 Fuel feed system .................................................................................................................................17

8.1.4 Valve timing .........................................................................................................................................18

8.1.5 Exhaust system ...................................................................................................................................19

8.1.6 Lubrication system..............................................................................................................................19

8.1.7 Electrical equipment ...........................................................................................................................19

8.1.8 Other engine-driven equipment (Enumeration and brief description if necessary): ..........................19

8.1.9 Justification of the correction formula used (if specific) ............................................................... 19

8.2 Spark-ignition engines – Essential characteristics ...................................................................... 19

8.2.1 Description of engine ......................................................................................................................... 19

8.2.2 Additional anti-pollution devices (if any, and if not covered by another heading) ........................... 21

8.2.3 Fuel feed system................................................................................................................................. 21

8.2.4 Valve timing......................................................................................................................................... 22

8.2.5 Ignition systems.................................................................................................................................. 22

8.2.6 Exhaust system................................................................................................................................... 23

8.2.7 Lubrication system............................................................................................................................. 23

8.2.8 Electrical equipment........................................................................................................................... 23

8.2.9 Other auxiliaries fitted to engine (Enumeration and brief description if necessary):........................ 23

8.2.10 Justification of the correction formula used (if specific) ...............................................................23

8.3 Test conditions for measuring engine net power ........................................................................... 23

8.4 Statement of results as function of engine speed .......................................................................... 26

9 Verification of engine performance .................................................................................................. 27

9.1 Designation ......................................................................................................................................... 27

9.2 Notation ............................................................................................................................................... 27

9.2.1 Declared net power and corresponding engine speed (range) ..................................................... 27

9.2.2 Declared net torque and corresponding engine speed (range)..................................................... 27

9.2.3 Declared specific fuel consumption and corresponding engine speed (range).......................... 27

9.3 Tolerances........................................................................................................................................... 28

9.3.1 Declared values................................................................................................................................... 28

Annex A (informative) Correction factors - Example showing how to demonstrate the formula............. 33

A.1 General................................................................................................................................................. 33

A.2 Example using test to test comparison............................................................................................ 33

A.3 Example of technical report............................................................................................................... 33

A.3.1 First example....................................................................................................................................... 33

A.3.2 Second example.................................................................................................................................. 33

Annex B (informative) CI fuel correction formula working in North America ............................................ 35

B.1 General................................................................................................................................................. 35

B.2 Reference CI Fuel Specifications...................................................................................................... 35

B.3 Calculation of Fuel Correction Factor, CF ....................................................................................... 35

Bibliography..................................................................................................................................................... 37

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(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

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International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 1585 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 5, Engine

This second/third/... edition cancels and replaces the first/second/... edition (), [clause(s) / subclause(s) /

table(s) / figure(s) / annex(es)] of which [has / have] been technically revised.

NOTE This international standard is also the basis for ISO 2534: 1974, Road vehicles – Engine test code – Gross

The users of this standard are informed that tests conducted outside of the Range of Authority (ROA) of the

Engine Control Module (ECM) are primarily made for the Conformity of Production (COP). The test and

This International Standard specifies a method for testing engines designed for automotive vehicles. It applies

to the evaluation of their performance with a view, in particular, to presenting curves of power and specific fuel

This International Standard concerns internal combustion engines used for propulsion of passenger cars and

other motor vehicles, excluding motorcycles, mopeds and agricultural tractors (see the note in the foreword),

⎯ reciprocating internal combustion engines (spark-ignition or compression-ignition) but excluding free

These engines may be naturally aspirated or pressure-charged either using a mechanical supercharger or

NOTE The users of this standard are informed that tests made outside of the Range of Authority (ROA) of the Engine

Control Module) (ECM) are primarily made for the conformity of Production (COP) and the test and correction factors used

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

ISO 3104: 1976, Petroleum products – Transparent and opaque liquids – Determination of kinematic viscosity

ISO 3675: 1998, Crude petroleum and liquid petroleum products – Laboratory determination of density or

ISO 5163: 1990, Motor and aviation-type fuels – Determination of knock characteristics – Motor method.

ISO 5164: 1990, Motor fuels – Determination of knock characteristics – Research method.

ISO 5165: 1992, Diesel fuels – Determination of ignition quality – Cetane method.

ISO 7967-1: 1987, Reciprocating internal combustion engines – Vocabulary of components and systems –

ISO 7967-2: 1987, Reciprocating internal combustion engines – Vocabulary of components and systems –

ISO 7967-3: 1987, Reciprocating internal combustion engines – Vocabulary of components and systems –

ISO 7967-4: 1988, Reciprocating internal combustion engines – Vocabulary of components and systems –

ISO 7967-5: 1992, Reciprocating internal combustion engines – Vocabulary of components and systems –

ISO 7967-8: 1990, Reciprocating internal combustion engines – Vocabulary of components and systems –

ISO 11614: 1999, Reciprocating internal combustion compression-ignition engines - Apparatus for

measurement of the opacity and for determination of the light absorption coefficient of exhaust gas.

ASTM D 240, Standard test method for heat of combustion of liquid hydrocarbon fuels by bomb calorimeter.

ASTM D 3338, Standard test method for estimation of heat of combustion of aviation fuels.

For the purposes of this document, the terms and definitions given in ISO 2710, ISO 7967-1, ISO 7967-2, ISO

7967-3, ISO 7967-4, ISO 7967-5 and ISO 7967-8 and the following definitions apply.

any parameter considered by the engine manufacturer to influence the peak power and/or torque ratings or

power obtained on a test bed at the end of the crankshaft or its equivalent at the corresponding engine

The dynamometer torque-measuring system shall have an accuracy within ± 1 % in the range of scale values

The engine speed (rotational frequency) measuring system shall have an accuracy of ± 0,5 %.

1) If the power measurement can only be carried out with a mounted gear-box, the losses in the gear-box should be

The system used to measure the back pressure in the exhaust system shall have an accuracy of ± 200 Pa.

The system used to measure the depression in the inlet system shall have an accuracy of ± 50 Pa. The

The system used to measure the absolute pressure in the inlet duct shall have an accuracy of ± 2 % of the

2 Induction heating device of inlet manifold Yes, standard production equipment. If possible, to be

1 Except in the case where there is a risk of the system having a noticeable influence upon engine power, an equivalent system may

be used. In this case, a check should be made to ascertain that inlet depression does not differ by more than 100 Pa from the limit

specified by the manufacturer for a clean air filter. Air inlet ductwork begins at the point where air enters from the atmosphere and ends

where the air enters the engine assembly at the throttle body, inlet manifold, or turbocharger, as appropriate. If part of this ductwork, the

2 Except in the case where there is a risk of the system having a noticeable influence upon engine power, an equivalent system may

be used. In this case, a check should be made to ascertain that the back-pressure in the engine exhaust system does not differ by more

If an exhaust brake is incorporated in the engine, the throttle valve shall be fixed fully open.

The fuel feed pressure may be adjusted, if necessary, to reproduce the inlet pump pressure conditions consistent with the particular

engine application (particularly where a “fuel return” system, e.g. to tank or filter, is used).

The air inlet valve is the control valve for the pneumatic governor of the injection pump. The governor of the fuel injection equipment

The radiator, fan, fan cowl, water pump and thermostat shall be located on the test bed in the same relative positions that they will

occupy on the vehicle. The cooling liquid circulation shall be operated by the engine water pump only.

Cooling of the liquid may be produced either by the engine radiator or by an external circuit, provided that the pressure loss of this circuit

and the pressure at the pump inlet remain substantially the same as those of the engine cooling system. The radiator shutter, if

Where the fan, radiator and cowl system cannot conveniently be fitted to the engine, the power absorbed by the fan when separately

mounted in its correct position in relation to the radiator and cowl (if used), shall be determined at the speeds corresponding to the engine