Volvo 819 E - Control Unit, Power Stage and Ignition Coil Configurations

Group 28 Ignition systems
Design and function - Components
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Control unit, power stage and ignition coil configurations
The control unit. power s tage and ignition coil configuration may take one of four different forms .
As a general rule , the con tro l unit delivers ignition pulses to the power stage (which co ntrols the current in the pri .
mary w in ding of the igni tion coil) in response to signals from the various sensors and pick-ups. A high · tension volt-
age is induced in the secondary and fed to the distributor, wh ich delivers it to the appropriate spark plug, generating
a spark across the eleClrodes and igniting the fuel /air mixture.
A. The control unit , power stage and ignition coil may all be separate components. This app lies to EZ-K syst ems.
B. The con trol unit and power stage may be combi ned in a single unit. with a separate ignition coil. This applies to
TZ· 28H .
C. The power stage and ignition coil may be com b ined, with the con trol unit separate. This applies to Rex-I.
O.
The control un it, power stage and ignition coil may compr ise a single unit .
• Alth ough the TZ-28H 'control u nit' does inco rpo rate a number of Ci r CUits additional to those used in EZ -K power s lages , i ls pr i-
mary funct ion is closer 10 thaI of a power stage. and the term 'con lr ol Unit' is somewhat misleading.
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