[Diy_efi] Ignition Hardware Driver Stage

[rr]

On Wed, 24 Jul 2002 08:17:38 +0200 (CEST)
 maier_markus at t-online.de wrote:
> Hi,
> 
> just to clarifiy some wordings:
> 
> With the ECM you mean the engine control unit (the uC
> based system)?

Yes, engine control module, same as ECU, engine control
unit. EST is electronic spark timing. Just a signal 
sent to the ignition module. Controls start of coil charge 
and coil firing.

> 
> With the EMC, the electro magnetic pick-up sensor is
> meant?

???


BobR.

> 
> Thanks
> Looks like the vision gets clearer.
> Markus
> 
> 
> rr schrieb:
> > 
> > I should not have said TTL, 0 to 5 volts is correct.
> The
> > modules amplify the pickup coil signal and send it to
> the
> > ECM 
> > as a reference pulse.
> > 
> > The ECM drives the EST line to start dwell (active EST)
> > then
> > fire the coil (inactive EST). The bypass allows the
> > module to
> > fire the coil independent of the EST line (for setting
> > the 
> > timing).
> > 
> > As far as I know the module will fire the coil with out
> > the
> > use of the pickup coil. That is a separate circuit.
> > 
> > BobR.
> > 

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