Concept D-EGR (© PSA Peugeot Citroën)


The Group's Clean Tech policy is founded on a dual approach: responsible and more environment-friendly development, and a balanced gasoline/Diesel strategy. The innovation was mainly designed to reduce the fuel consumption of gasoline engines. With the EGR system in diesel engines, PSA Peugeot Citroën will be able to offer high-efficiency gasoline engines that consume 10% less fuel than their predecessors across all uses. This innovation will be available in our vehicles by 2018.

The reason behind this innovation?

  • To develop highly efficient petrol engines that allow significant fuel savings
An innovation that will reduce the consumption of petrol engines to go beyond the European regulations that will come into force in 2020

How does the EGR system in diesel engine works?

  • By increasing the quantity of recirculated gas (EGR*) and the compression ratio in the cylinders in order to optimise engine efficiency
  • Excess fuel is sent to the cylinder dedicated to producing the recirculated gases, the hydrogen (H2) content of which increases
  • Owing to the presence of the hydrogen:
    - The combustion of the fuel in the cylinders is faster, even when recirculated, burnt gases are present
    - Pinking, or abnormal combustion under high loads, is significantly reduced

What are the benefits for users?

  • A high-efficiency petrol engine offering
  • 10% savings in all uses
    - CO2 savings of ~10% over homologation cycles
    - CO2 savings of ~10% under all customer driving conditions

Patents & Partners

  • Two patents filed by PSA Peugeot Citroën
  • Development derived from a collaborative programme with SwRI US research laboratory

*EGR : Exhaust Gas Recirculation


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