L-Jetronic peculiarity

[Bruce Plecan]

-----Original Message-----
From: James Montebello <jamesm at talarian.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Monday, February 08, 1999 7:33 PM
Subject: RE: L-Jetronic peculiarity

Anyone happen to have any data about how often, duty cycle, etc, on this
injector firing strategy?.  
Bruce



>>  The L-Jet has a spark signal from the distributor to get 
>> RPM, but it's not timed to the crank at all, so perhaps Bosch just 
>> drives the injectors at some frequency high enough to make sure no 
>> cylinder goes too long without an injection event.
>Actually, I think Bosch's experience with CIS showed them that 
>simply running the injectors continuously, only varying the 
>flow rate with load, was "good enough".  At least it was for
>US emissions regs up to around 1990.  It's a simple control
>strategy, easy to do with all mechanical or electro-mechanical
>systems.  Now that sufficiently fast digital hardware is so 
>cheap, they can return to the more complicated strategy such
>as the one they employed in the D-Jet system, and do all the
>hard stuff in software.
>james montebello