Dodge Sprinter 2006 Manual page 855

VA
New soft wa r e h a s been loa ded t o t h e E CM for E GR
con t r ol. Th is is du e t o t h e wider oper a t in g r a n ge a n d
la r ger volu m e of r ecir cu la t ed ga s. Th er e is a con sid-
er a ble n u m ber of n ew, a da pt ed, a n d opt im ized fu n c-
t ion s, pa r t icu la r ly wit h r ega r d t o in ject ion , E GR,
boost con t r ol, sen sin g of t h e in pu t pa r a m et er s a n d
t h e sign a lin g of t h e a ct u a t or s (F ig. 3).
• Th e r a il pr essu r e con t r ol a ch ieved by sign a lin g
t h e qu a n t it y con t r ol va lve in t h e h igh pr essu r e pu m p
a n d t h e pr essu r e r egu la t or r esu lt s in r edu ced power
con su m pt ion of h igh pr essu r e pu m p a n d in lower in g
fu el pr essu r es
• In dividu a l cylin der t or qu e con t r ol for sm oot h
en gin e r u n n in g: u sin g t h e cr a n ksh a ft posit ion sen sor
sign a ls, t h e E CM det ect n on -u n ifor m en gin e r u n n in g
r esu lt s fr om u n even t or qu e con t r ibu t ion s of t h e in di-
vidu a l cylin der s a n d a dju st t h e in ject ion qu a n t it ies of
t h e in dividu a l in ject or s so t h a t a ll cylin der s m a ke t h e
sa m e t or qu e con t r ibu t ion
• A r ela y is u sed for a ct iva t in g t h e elect r ic in -t a n k
fu el pu m p
• H ea t ed cr a n kca se ven t ila t ion t o en su r e pr essu r e
com pen sa t ion even a t low t em per a t u r es
• Im pr oved boost pr essu r e con t r ol u sin g a n elec-
t r ic va r ia ble n ozzle t u r bin e a ct u a t or wit h posit ion
feed ba ck
• Con t r olled fu el h ea t in g u sin g t h e h igh pr essu r e
pu m p closed-loop con t r ol
• Tr a n sla t ion of t h e dr ive in pu t r eceived fr om t h e
a cceler a t or peda l m odu le wh ich is equ ipped wit h
du a l h a ll sen sor s
ELECTRONIC CONTROL MODULES 8E - 5
Fig. 3 ECM CONTROL
• Mea su r em en t of t h e in t a ke a ir m a ss u sin g n ew
m a ss a ir flow (MAF ) sen sor wit h in cr ea se pr ecision
a n d ext en ded m ea su r in g r a n ge
• O2 sen sor for m ea su r in g t h e a m ou n t of oxygen
in t h e exh a u st in or der t o ca lcu la t e t h e a ir t o fu el
r a t io. Wit h t h e in t a ke a ir m a ss bein g kn own , t h e
in ject ed fu el qu a n t it y ca n be ca lcu la t ed fr om t h e a ir
t o fu el r a t io
• Act iva t ion of t h e O2 sen sor h ea t er t o bu r n off
deposit s
• F u ll loa d E GR wit h a m or e pr ecise, m odel ba sed
E GR closed-loop con t r ol. Th e E CM ca lcu la t es t h e
E GR r a t e fr om t h e va r iou s sen sor sign a ls. Usin g t h e
ca lcu la t e E GR r a t e in per cen t in st ea d of t h e fr esh a ir
m a ss flow a s a con t r ol pa r a m et er en a bles a m or e pr e-
cise con t r ol of t h e E GR r a t e a s well a s bet t er cor r ec-
t ion of t h e t a r get va lu e.
Th e oxygen sen sor sign a l ca n be u sed in com bin a -
t ion wit h t h e m a ss a ir flow sign a l, t h e in ject ion
qu a n t it y sign a l a n d pr essu r e a n d t em per a t u r e sig-
n a ls t o per for m t h e followin g fu n ct ion s for opt im ized
closed loop con t r ol a n d m on it or in g of em ission s
r ela t ed com pon en t s:
• In ject ion va lve qu a n t it y dr ift com pen sa t ion in
pa r t ia l loa d r a n ge: t h e oxygen con t en t in t h e exh a u st
is ca lcu la t ed fr om t h e a ir m a ss a n d fr om in ject ion
qu a n t it y sign a l a n d is com pa r ed t o t h e a ir-fu el r a t io
a s m ea su r ed by t h e sen sor. If t h e ca lcu la t ed a ir-fu el
r a t io differ s fr om t h e m ea su r ed a ir-fu el r a t io, t h e is
n o cor r ect ion of t h e in ject ion qu a n t it y bu t t h e E GR