The project is structured in 6 work packages. Four of them are dedicated to research activities in line with the scientific goals of the project. One of them is dedicated to management and coordinations, and the last one dedicated to creating impact.
WP1: Extending amount fraction capabilities of high accuracy primary reference materials of NO2
The aim of this work package is to extend the current state of the art and current capabilities for NO2 reference materials up to 2500 µmol/mol and down to 1 µmol/mol with uncertainties of less than or equal to 1 % to fulfil the requirements of PEMS measurements of less than 2 % for NO2. This working range covers scenarios for both exhaust emissions from normally functioning engines (1 – 10 µmol/mol) to catalyst failure (1000 – 2500 µmol/mol). In addition, WP1 will develop multicomponent gas calibration mixtures for calibration of PEMS and characterise matrix-based calibration biases, will develop a traceable calibration method for NOx measurements and will develop a measurement system based on a modified dTDLAS-spectrometer to be used as an analytical transfer standard for NOx measurements.
WP2: Metrological validation and performance tests of PN-PEMS devices
The aim of this work package is to validate and determine the performance of the current the state of the art of the PEMS measurement devices by comparison with traceable PN calibration facilities. As part of this the project will investigate commercially available PN-PEMS devices including dilution systems upstream of the particle counters as well as volatile particle remover (VPR) systems which are used to remove volatile compounds from exhaust emissions. In addition, WP2 will develop validated and traceable calibration strategies for linearity, efficiency and penetration measurements for PN-PEMS.
WP3: Application-oriented PEMS EFM calibration procedures and uncertainty budgets
The aim of this work package is to develop application-oriented calibration procedures and associated uncertainty budgets for PEMS EFM for conditions (e.g. exhaust gas temperature, composition, and transient engine operation) meeting RDE legislative requirements. This will be done for relevant carrier gases and will include an investigation of the effect of dynamic flow behaviour on PEMS uncertainty.
WP4: Real-world assessment of PEMS performance
The aim of this work package is to quantify the correlation between: i) RDE-PEMS measurements and laboratory dynamometer test results, ii) individual PEMS “channels” for CO2, CO, NO, NO2, PN, exhaust mass flow and iii) validated ’golden’ (reference) PEMS and commercially available PEMS. As part of this WP4 will assess the performance of commercial PEMS-systems as calibrated by their respective manufacturer, as well as a ‘golden PEMS’, i.e. a PEMS that has been specifically prepared and traceably calibrated within the project. This assessment will include testing the PEMS-systems both on a chassis dynamometer in a laboratory set-up, as well as tests on the road, as per RDE testing. Tests will be made on two PEMS compliant routes, with four cars; two with a spark-ignition (SI)-engine (i.e. petrol) and two with a compression ignition (CI)-engine (i.e. diesel), in order to investigate their inherently different exhaust gas compositions.