WLTP 2nd act WLTP to be followed by WLTP 2nd act

Since the 6th of September 2017, new passenger cars type approvals can only take place in the European Union and a series of other countries in Europe based on results of CO2 measurements according to the new Worldwide Harmonized Light-Duty Vehicles Test Procedure (WLTP).

Since the 1st of September 2018, WLTP measurements are compulsory for new passenger cars registrations. Same regulations apply for light commercial vehicles starting one year later.

Testing takes place in a special chamber at 23 degrees Celsius, with a cycle distance of 23 kilometers during driving cycles of 30 minutes with speeds averaging 47 km/h and going up to 130 km/h. All possible engine and gearbox versions are tested.

 

The transition from the previous emissions test procedure NEDC to WLTP has brought about encompassing changes within the automotive industry. Additional test components will further sharpen the newly introduced WLTP procedure until the year 2020.

WLTP to be expanded by a total of four tests:

  • Since September 2018, the "Real Driving Emissions Procedure (RDE)" checks the laboratory test values for realistic accuracy. The measured pollutants are checked in road traffic conditions. The rules allow only marginal deviation from the lab value.
  • "Service Conformity (ISC)" is a test procedure used since the beginning of 2019 to check whether a vehicle maintains its initial consumption values also after it has been in use for a longer period of time, and the WLTP measurement cycle must be completed again several times over. The cars in this measurement series have an age between six months and five years and a mileage between 15.000 and 100.000 Kilometers.
  • According to the "Evaporative Emission Test (EVAP)" which is mandatory starting September 2019, the measurement of so called fuel tank evaporations - occurring when the vehicle is parked - must be carried out as well.
  • The "Onboard Fuel Consumption Monitoring (OFCM)" test procedure valid starting 2020 refers to the checking of consumption indicators used to inform the drivers about the fuel consumption of their vehicles. Since the actual fuel consumption is strongly influenced by the driving behavior, this additional test procedure is considered particularly important. The fuel quantity before and after the dynamometer rig test is measured and compared with the fuel quantity calculated in the WLTP measurement. The resulting deviation must be minimal.

Within the framework of WLTP 2.0, requirements concerning vehicles are formulated more precisely. It´s worth mentioning that behind the steering wheel there is still a person, machines are not used for simulations.