Volvo 819 E - Ez-118 K

Group 28 Ignition systems
Design and funct io n System descriptions
4
EZ -118K
EZ -118K
B200E , B230E and B230K
The con tr ol unit (11 computes the op ti mum t imin g on the basis of informa t ion from the various sensors and trans -
mits the necessary ignition pu lses 10 t he power stage /21. wh ich con trol s Ihe curren t in the primary wind i ng of the ig-
nition coil (3). The high - tens ion current induced in the secondary w inding by interruption of the primary is fed to the
distributor (4) for delivery to the appr opri ate spark plug (5).
Variants for the B230 K eng ine also sup ply signals to a solenoid valve (25) controlling the fuel cut-off function under
engine brak ing conditions.
The timing selting compu t ed by the con tr ol unit is based on the following information :
-
An engine load signal is supplied by a vacuum line ( 12 ) between the control unit and the intak e manifold.
- A Hall generator in the distr i butor (4) supplies an eng ine speed/crankshaft position signal.
- Engine knock is indicated by a kno ck sensor (26).
- Closure
of the throttle is i ndicated by a throttle switch ( 19 ) mounted on the thr o ttle cable pulley.
- On models equipped with AC, operation of the comp ressor (2 8) is indicated by a si gnal from the electromagnetic
clutch.
-
The selection of a drive position on automatic models is indic ated by a signal from the starting interlock swi tch
(27)
via a relay.
-
Engine temperature is measured by a temp erature sensor ( 201 in the c ylinder head (B 230 K only).
5'