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INGAS Subproject SPB2

INGAS Subproject SPB2. 18 Month Meeting Paris, Subproject B2, Status AVL (month 13-18) Marko Certic, AVL List GmbH. INGAS Subproject SPB2. Technical approach / Innovations – Engine Concept

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INGAS Subproject SPB2

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  1. INGAS Subproject SPB2 18 Month Meeting Paris, Subproject B2, Status AVL (month 13-18) Marko Certic, AVL List GmbH

  2. INGAS Subproject SPB2 • Technical approach / Innovations – Engine Concept • New engine concept with central injector position will enable a good charge stratification capability and sufficient space for the mounting of the Piezo injectors Spark Plug Central Injector New cylinder head design for Multi cylinder engines (Daimler)

  3. INGAS Subproject SPB2 • WPB2.4 Engine Testing/EAT System Management: • Main objectives of WPB2.4 are: • To do baseline tests as input for the catalyst development • To perform engine tests with new catalyst formulations • To perform engine tests with EAT system • To develop operation / calibration strategies for EAT system • To evaluate the emission potential of EAT system • Status Summary of WPB2.4: • Baseline testing (task B2.4.1) finished, data evaluated and delivered to Daimler • EAT/CH4-Catalyst Evaluation (task B2.4.2) will start in second half of 2010 • In A2 subproject different strategies for catalyst heating investigated using only technology available on the engine • MCE engine is having different hardware problems causing delay also in A2 project (camshafts phasing, cylinder head damage, DI injector not stabile, blow-by system) • Due to the problems with DI Injectors engine temporally converted to MPFI

  4. INGAS Subproject SPB2 • Task B2.4.1 Engine/EAT Set-up/Baseline Investigations: • Baseline investigations • Measurements according to defined testing plan conducted with additional H2 measurements of engine out emissions • In addition same measurement program done also with MPFI, w/o H2 • EAT set-up in preparations • EAT prototype (full size) still not available • for work on the engine test bed bypass for the exhaust gases is planed in order to prevent overheating of the EAT

  5. INGAS Subproject SPB2 • Measurement program for baseline investigations with H2 analysis For every load point adjust lambda in range 1.1 – 0.9 in 0.02 steps and measuring H2, CO, CH4, NOX, NO, O2, lambda raw emissions before catalyst. That means 10 measurements for each engine load point, if possible with cold coolant. Hold engine load until concentrations become nearly state or ~3min.

  6. INGAS Subproject SPB2 Results of baseline investigations with H2 analysis 750 rpm/ 0.72 bar 1200 rpm/ 0.72 bar

  7. INGAS Subproject SPB2 Results of baseline investigations with H2 analysis 1600 rpm/ 2.00 bar 1600 rpm/ 2.00 bar

  8. INGAS Subproject SPB2 Results of baseline investigations with H2 analysis 1600 rpm/ 3.41 bar 1600 rpm/ 3.41 bar

  9. INGAS Subproject SPB2 Results of baseline investigations with H2 analysis 1600 rpm/ 4.71 bar 1800 rpm/ 3.40 bar

  10. INGAS Subproject SPB2 Results of baseline investigations with H2 analysis 1800 rpm/ 6.02 bar 1800 rpm/ 6.02 bar

  11. INGAS Subproject SPB2 • During baseline catalyst inveastigations increase of the HC emissions noticed and documented • Cause is still not found • Shortly afther catalyst investigatoins cylinder head was replaced which brought HC emissions to previous level

  12. INGAS Subproject SPB2 • Task B2.4.2 EAT/CH4-Catalyst Evaluation: • Preparations for advanced catalyst investigations in progress. Testing plan defined together with Daimler. • EAT testing plan still not fully defined • Catalyst characterisation to be performed as for other advanced prototypes • Strategy for the most efficient catalyst heating still open, potential of the engine itself still not fully investigated within A2

  13. INGAS Subproject SPB2 Test Procedure for Advanced Catalyst Characterization Quick-Characterization fresh TWC Pre-Conditioning TWC Characterization TWC Aging TWC Characterization TWC

  14. INGAS Subproject SPB2 • Catalyst heating • Comparison of INGAS CNG DI engine with different injection strategies with a Euro 4/5 gasoline engine using HSP • Combustion stability of INGAS engine is very good with late ignition. • Also the HC raw-emissions are low – lower than gasoline engine. • Due to the very late ignition (>30deg aTDC) needed for an exhaust gas temperature comparable to gasoline engine (e.g. 750°C) the NOx raw emission is higher, especially because also the exhaust gas massflow is significantly higher  next slide • First shots with postinjection (green points) show a significant potential

  15. INGAS Subproject SPB2 • Catalyst heating • Comparison of INGAS CNG DI engine with different injection strategies with a Euro 4/5 gasoline engine using HSP • Emissions in g/h show that the NOx emissions are more than 2 times higher compared to gasoline. • First tests with postinjection (green points) show here a significant advantage. Up to now about 620°C could be reached with HCs at the level of single injection but NOx ¼ of single injection  Next step is to increase temperature to at least 750°C at half the raw emissions of a gasoline DI. So some space is left for longer catalyst heating needed for light-off with Methane.

  16. INGAS Subproject SPB2 • Catalyst heating • No significant difference between DI and MPI for homogeneous operation • Significantly lower gaseous emissions at same exhaust gas temperature for postinjection, but combustion stability and soot emission have to be improved

  17. INGAS Subproject SPB2 • Next Steps AVL (month19-24) • Advanced catalyst testing according to test procedure with • engine out emissions (before cat) including H2 • tailpipe emissions (after cat) including H2 • EAT System set-up and testing • set-up on engine test bed and commissioning (special measures to prevent overheating of the full scale prototype to be implemented) • basis evaluation same as for other prototype catalysts • development of the engine running strategies for EAT with and w/o gas burner

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