parSYNC® RDE (Real Driving Emissions)

parsync RDE banner2


3DATX has listened to you, the customer, and has modified our GasMOD™ Sensor Cartridge to include CO / CO2 / and NOx.  Now, along with the PM/PN Sensor Cartridge, you are ready for RDE testing.


What is RDE (Real Driving Emissions)?

Taking place on real roads, the RDE test complements lab tests by measuring that a car delivers low pollutant emissions on the road.

Real driving emission (RDE) tests will measure the pollutants, such as NOx, emitted by cars while driven on the road. RDE will not replace laboratory tests, such as the current NEDC and the future WLTP but it will be additional to them. RDE will ensure that cars deliver low emissions over on-road conditions.

How will RDE tests work in practice?

Under RDE, a car will be driven on public roads and over a wide range of different conditions. Specific equipment installed on the vehicle will collect data to verify that legislative caps for pollutants such as NOx are not exceeded.

RDE test


What equipment is needed for RDE?

To measure pollutant emissions as the vehicle is being driven on the roads, cars will be fitted with Portable Emission Measuring Systems (PEMS) that will provide a complete real-time monitoring of the key pollutants emitted by the vehicle (ie NOx).

When will RDE be implemented?

The EU has adopted a step-by-step approach to introducing RDE, splitting the legislation over a total of four separately-approved ‘packages’. The first two packages are now adopted, enabling manufacturers to start preparing for the introduction of the new emissions test. However, two key packages are still missing and are urgently needed to complete the legislation. The Commission has the aim of presenting the third package to the member states by October 2016 and the final part should be presented by mid-2017.

The Real Driving Emissions (RDE) test will be implemented in September 2017 for new types of cars and will apply for all registrations from September 2019.

What are conformity factors?

A conformity factor is defined as a ‘not to exceed limit’ that takes into account a margin for error, which is present simply because PEMS equipment does not deliver exactly the same results for each test. For example, PEMS are not as accurate as a full laboratory system so they will not measure to the same level of repeatable accuracy as a lab test. In practice, car manufacturers must set their design objectives well below the legal limit to be certain of complying.