CommonRail (2008-03-27 20:06:10)

CommonRail - High pressure electronic diesel injection


Aftermarket controllers:
http://www.bankspower.com/Tech_SixGun_Cummins.cfm
Technical papers:
Modelling pressure waves in the rail

http://www.vehicular.isy.liu.se/Publications/MSc/00_EX_3081_KA.pdf

Paper on the effect of timing and duration of main and pilot injection. Mainly conserning noise levels.

http://www.macchine.unisa.it/meca01/papers/MECA01_paper06.pdf

Modelling of a diesel engine common rail injection system

http://www.nt.ntnu.no/users/skoge/prost/proceedings/ifac2005/Fullpapers/04315.pdf

Achieving lower exhaust emissions and better performance in an HSDI diesel engine with multiple injections

http://www.tytlabs.co.jp/office/elibrary/ereview/rev373epdf/e373_009hotta.pdf

Optimizing the multiple injection settings for a HSDI diesel engine

http://books.google.com/books?id=-F7lKlRtKuIC&pg=PA123&hl=sv&source=gbs_toc_s&cad=1&sig=snbLjPZM0vEGKR5kGE_yAIhb7_s


Issues:

AFAIK there is no general aftermarket common rail diesel ECU available. This makes it impossible to use a common rail diesel in applications where the stock ECU does not work. One popular application can be marinisation of car engines. Another might be putting modern diesels in older cars. Or for tractors or gensets or whatever...

One critical thing would be timing for injection


Timing:

pilot injection

~ -40degrees (2-4mm^3) Timing not critical. Optimal timing is dependant on load and revs.

Main injection

no load -2 - 4

part load -6 - 4

full load -15 - -6

duration 40-60 deg crank

5000 crank rpm = 5000 / 60 rps = 5000/60 * 360 degps = 33us/deg

average unexpected delay = 7us = 7/33 deg = 0.21deg


Electrical Requirements:

Like voltage and current of injectors