[Gmecm] Saturated/P&H injection

[davesnothereman at netscape.net]

OIther than the fact that one indicates a single driver while the other 
is plural?

Peak and hold injector drivers operate low impedance injector drivers.  
They allow higher current to initially open the injector, then when 
current reaches a peak level the driver switches to "hold" mode, 
limiting current to typically 1/4 of the peak value.

Saturated injector drivers are designed for high impedance injectors.  
Total current draw through these injectors is lower than the low 
impedance types, so the driver simply allows maximum current through 
the injector coil at all times.  This scheme allows the injector coil 
to become "saturated" with current.

P&H drivers will operate saturated type high impedance drivers.  
Saturated drivers are not intended to be used with P & H type 
injectors, although some people (and even OEM's) will do so with the 
aid of current limiting resistors.

The 7749 can operate in either saturated or P & H mode selectable by an 
external jumper.

Zaphod

-----Original Message-----
From: Robin Handley <Robin at FuryWorld.fsnet.co.uk>
To: gmecm at diy-efi.org
Sent: Sun, 14 May 2006 12:42:47 +0100
Subject: [Gmecm] Saturated/P&H injection

   Something else that's been puzzling me recently, from the reading 
that I've
been doing, is what's the difference between: 'saturated injector 
driver'
(Syclone?) and 'dual Peak&Hold' (Sunbird?). Can anyone help?

Robin

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