ISO 4106:2012 pdf download.Motorcycles一Engine test code一Net power
ISO 4106 specifies methods for evaluating the performance of engines designed for motorcycles as defined in ISO 3833, in particular with a view to the presentation of power curves and specific fuel consumption at full load as a function of engine speed, for net power assessment. It is applicable to reciprocating internal combustion engines (spark-ignition or compression-ignition) — excluding free-piston engines — and rotary piston engines, either naturally aspirated or pressure-charged and equipped with either mechanical pressure-charger or turbocharger. Particular specifications for the test of compression-ignition engines are specified in Annex A.
2 Normative references
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 document (including any amendments) applies.
ISO 2710-1, Reciprocating internal combustion engines — Vocabulary — Part 1: Terms for engine design and operation
ISO 3833, Road vehicles — Types — Terms and definitions
ISO 15550, Internal combustion engines — Determination and method for the measurement of engine power — General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 271 0-1, ISO 15550 and the following apply.
3.1
net power
power obtained on a test bed at the end of the crankshaft or its equivalent at the corresponding engine speed with the equipment and auxiliaries listed in 6.3.1
3.2
corrected net power
net power corrected under the standard reference conditions
3.3
net torque
torque transmitted on a test bed at the end of the crankshaft or its equivalent at the corresponding engine speed with the equipment and auxiliaries listed in 6.3.1
3.4
corrected net torque
net torque corrected under the standard reference conditions
3.5
specific fuel consumption
amount of fuel consumed by an engine per unit of power and time
NOTE The amount of the lubricants for two-stroke cycle engines is excluded.
6 Tests
6.1 General
This test method is used for verifying the net power of an engine type with the declared values. It presents engine performance at full power/torque as a function of engine speed by generating curves of corrected net torque, corrected net power and specific fuel consumption.
6.2 Measuring equipment and instrument accuracy
6.2.1 Torque
The dynamometer torque-measuring system shall have an accuracy of ± I % in the range of scale values required for the test. The torque-measuring system shall be calibrated to take into account friction losses. The accuracy may be ± 2 % for measurements carried out at a power less than 50 % of maximum power.
6.2.2 Engine speed
The engine-speed measuring system shall have an accuracy of ± 0,5 %.
6.2.3 Fuel flow
The fuel-flow measuring system shall have an accuracy of ± 1 %.
6.2.4 Fuel temperature
The fuel-temperature measuring system shall have an accuracy of ± 1 K.
6.2.5 Engine inlet air temperature
The air-temperature measuring system shall have an accuracy of ± 1 K.
6.2.6 Barometric pressure
The barometric-pressure measuring system shall have an accuracy of ± 70 Pa.ISO 4106 pdf download.