To meet  greenhouse gas emissions targets and air quality objectives, the internal combustion engine needs to be further improved, being accompanied by the development and progressive implementation of breakthrough technologies, such as electrified propulsion. This is where EU Horzion 2020 funded project dieper (Diesel efficiency improvement with Particulates and emission Reduction) comes in, addressing the supply side of the market by researching the initial key challenges OEMs must overcome for one of the major engine types in their current market line-ups.

Customer Benefit

dieper will develop advanced diesel engine technologies for passenger cars and Light Commercial Vehicles (LCV). The project will focus on fuel-efficient engine combustion with advanced charging, exhaust gas recirculation (EGR), thermal management and exhaust gas treatment concepts. Options such as Variable Compression Ratio (VCR) will also be considered. Two demonstration vehicles (a 2.0l Renault Espace and a 3.0l IVECO Daily) will contain the selected technologies.

Independent testing shall prove:

  • Improved fuel economy compared to Model Year 2015 reference engines of the participating OEMs ( ≥ 5%) over the World-wide harmonised Light duty Test Cycle (WLTC)
  • Pollutant emissions that go to ≤ 50% of EU-6d emissions standards including particle emissions down to 10nm in size (Particle Number target is to go below 20% of the EU-6d limit) over WLTC and Real Driving Emissions (RDE) testing regimes


The following technologies will be advanced to TRL 6 or TRL 7 and integrated into two demonstration vehicles:

  • Fuel-efficient engine combustion
  • Advanced Charging
  • Low Pressure Exhaust Gas Recirculation (LP EGR)
  • Thermal management concepts
  • Exhaust gas treatment concepts.

Additional significant improvements in fuel efficiency vs. the Model Year 2015 reference engiens will be investigated via combustion system with a variable compression ratio.

Ricardo specifically will be responsible for the following:

  • Leadership of Work Pacakage 5 (LCV)
  • Specification of the exhaust aftertreatment for the LCV demonstrator vehicle using:
    • A complete forward-facing vehicle model (consisting of drivetrain, engine, aftertreatment and supervisory controllers) created using the Ricardo IMBD (Integrated Model-Based Development) toolchain
    • Exhaust aftertreatment hardware screening on an engine test-bed

Website: http://www.dieper-project.eu/

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 723976