ISO 19449:2015 pdf download

ISO 19449:2015 pdf download.Mopeds — Measurement methods for gaseous exhaust emissions during inspection or maintenance
1 Scope
This International Standard specifies methods for the direct measurement of the concentration of gaseous exhaust emissions from mopeds as defined in ISO 3833 during inspection or maintenance. The results measured by this International Standard show the concentration of gaseous exhaust emissions in the no-load engine operating condition. It is applicable to mopeds having spark ignition engines (four-stroke engines or two-stroke engines). These methods can be used, either totally or partially, for
— periodic inspections in official garages,
— official roadside checks, and
— maintenance and diagnostic operations.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/PAS 3930 1) , Instruments for measuring vehicle exhaust emissions — Metrological and technical requirements; Metrological control and performance tests
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 idling condition
no-load operating condition of engine warmed up in accordance with 7.1 with
— no manual operation with fuel system controls (throttle, choke, etc.),
— the gear in neutral, and the manual clutch engaged for mopeds with the manual transmission,
— the parking condition for mopeds with the automatic transmission, and
— standard production equipment, accessories and optional equipment that modify the engine speed used in accordance with the manufacturer’s recommendations or regulatory requirements
Note 1 to entry: Automatically operated headlamps are standard production equipment. There is a possibility that headlamp operation influences the test results of gaseous exhaust emissions.
3.2 idling speed
engine speed (range) specified by the manufacturer under the idling condition.
4 Instrumentation
The instruments listed below shall be prepared:
4.1 Analyser, in accordance with ISO/PAS 3930, suitable for the concentrations of gaseous exhaust emissions from the mopeds under test,
4.2 Surface temperature meter, with a measurement accuracy of at least ±2 K between 323 K and 373 K,
4.3 Pulse revolution counter, for measuring engine speed. The measurement accuracy shall be at least ±20 min -1 between 600 min -1 and 2 000 min -1 , and shall be at least ±50 min -1 between over 2 000 min -1 and 6 000 min -1 , and
4.4 Ambient temperature meter, with a measurement accuracy of at least ±2 K between 278 K and 313 K.
5 Check, maintenance periodicity and precautions for use of instruments
5.1 Check before use
The power supply to the instruments shall be in accordance with the manufacturer’s specifications.Check that the instruments are ready for testing in accordance with the manufacturer’s operating instructions, or at least,
— at the beginning of tests of a day,
— when the ambient conditions have changed, or
— at the beginning of tests at each new test site in the case of official roadside checks.
For the analyser, the zero and span calibration check shall be performed with reference gases or using electronic or electromechanical methods (see ISO/PAS 3930).