Demonstrator-MERC: Exhaust gas condensation system for high water injection rates in gasoline engines

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Deliverables:
D3.2 Layout Combustion System CFD
D3.6 on the water & gasoline spray investigations and PWI vs. DWI engine investigation

The full poster

Motivation

  • Reduction of CO2 emissions by increased engine compression ratio (CR)
  • High water to fuel ratios for Direct Water Injection (DWI) to avoid engine knock limitation for increased engine efficiency
  • Water recovery from exhaust gas condensation as enabler for self-sustaining water injection and increase of customer acceptance for water injection systems
  • Stoichiometric air/fuel ratio in entire engine map for low CO2 emissions and RDE compliance

Engine Dyno Configuration

Reduction of Fuel Consumption with DWI and CR 13.5:1

Relative difference to engine with PWI and CR 12:1 engine testing results.

Package & Vehicle Integration

Condensate system can be integrated in OEM vehicle packages

Results of Water Injection & Condensate Harvesting Efficiency & Quality

  • CO2 improvement of >15% can be realized
  • Harvesting of more condensate than injected is possible
  • Harvesting efficiency investigated and >60 %
  • Condensate quality after GPF nearly free of particles, neutral pH-values – no disadvantages in combustion or emission topics
  • Different condensate harvesting points compared – best position after exhaust aftertreatment (GPF)
  • Same advantages for emissions and combustion for condensate compared with distilled water