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Common Rail controlling algorithm development

 

2D scanning maps: Optimization of Common Rail Injection Duration fi and Injection Timing qi in view of limitation (p_max < 130 bar; p_inj max < 1650 bar).

  • Goal function is Summary Emission (SE) of PM and NOx.
  • Allowable area is yellow filled.
  • Optimal area with minimum emission level SE is blue-green filled.
  • Selected point for controlling algorithm forming is marked with black rhomb.
  • Injection pressure p_inj is a pressure before nozzles.
4000_81.gif (7131 bytes) Mode: Full load 
RPM=4000, mf = 93%

Allowable area has not common site with optimal area. Optimal solution is point formed by crossing lines of p_max=130 bars and p_inj=1650 bars.  
This point is near  to optimal area.

4000_42.GIF (7653 bytes) Mode:   RPM=4000, mf = 57%

Optimal area has common site with allowable area. Limit of max. cyl. pressure is not critical. The acceptable SFC can be achieved with injection pressure 1500 bars, maximal injection pressure is not required.

4000_8,2.GIF (8036 bytes) Mode: RPM=4000, mf = 29%

Optimal area lies inside allowable area. Low emission level area is matched with low SFC area.

2200.GIF (6721 bytes) Mode: Max. torque,
RPM=2200, mf = 100%

Optimal area SE min has common site with allowable area. Limit of max. cyl. pressure is critical. High injection pressure is not required.

2000_13.GIF (7662 bytes) Mode: RPM=2000, mf = 32%

Optimal area lies inside allowable area. Operating point is selected inside low emission level area, near with low SFC.

IDLING.GIF (7883 bytes) Mode: Idling
RPM=800, mf = 15%

Optimal area lies inside allowable area. Operating point is selected inside low emission level area, near with low SFC.

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