Volvo 819 E - Page 58

Group 28 Ignit io n syst ems
Design and fun ct io n - Syst em descr iptions
EZ - 115K
EZ-115K - No . 1 cylinder detector
Since the B280 eng i ne is equipped w i th tw in kno ck sensor s (one for each bank of cy li nders ), the contr ol un it mus t be
able to dis t inguish bet ween the t wo in o rder to de t erm ine whi ch cy l inde r is knocki ng . For this purp ose. the high -
ten
sio n lead to No. 1 cylinder is fin ed w ith an induct ive detect or (1 5).
The device cons ists of a coi l (16) w ou nd on a c ore (17) surr o unding the igni t ion lead (18 ). The cu rr ent pulse in duced
in the coil
by the HT cu rr e nt in th e l ea d as the cylinder fires is the signal used by the con tr ol unit to m ai nt ain the co r-
re ct firin g order at all tim es. Th e si gn al is also used to ide nt i fy an indivi dual cyli nd er a ff ec ted by kn oc k, ena bling th e
co ntr ol unit to ret ar d the ignit ion in th e cyli nde r affected.
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