Volkswagen explains the testing processes and technical requirements of the second stage of the Worldwide Harmonised Light Vehicle Test Procedure, which comes into force in September.
As of September 2019, all newly registered vehicles will have to adhere to the Euro 6d Temp Evap ISC standard within the second stage of the WLTP test. In this video, Volkswagen explains the new testing processes and technical requirements of the WLTP, which was introduced last year.
‘Evap’ refers to the verification of evaporate emissions. An activated charcoal filter in the tank system of all VW models prevents petrol vapors from being released into the environment. Previously this was tested in an airtight chamber for 24 hours. In the future, however, the period will be extended to 48 hours – at constant limit values. Vehicles will be retrofitted with technology to meet these additional requirements.
Another major change within the second stage of the WLTP introduces a test that measures if the emission limits are still met during vehicle operation. In future, vehicles up to five years old will be subjected to a random WLTP test.
This test, badged ISC (in service conformity), will be carried out on selected vehicles with a mileage of up to 100,000km. Volkswagen also undertakes mobile exhaust gas measurement of customer vehicles on-site.