Event loops

[Bruce Bowling]

A question on event loops in OEM EFI's......

There appears to me that there are several methods to 
handle the global "events" of computing injector pulse
widths and timing.  Some that come to mind are the following
(I am assumimg a model similar to the '332 TPU section,
which handles the timing of injector firing and provides
interrupts for events like TDC.)

Note: the names for each of the methods I picked out of my head.....

Method 1: 360/720 degree firing:  One computes ALL of the FI parameters
(table lookups, etc) for all of the injectors once a crankshaft revolution
(batch) or once every two revolutions (sequential).

Method 2: 90 degree firing: When injector N is firing, compute the firing
parameters for injector N+1.

Method 3: Priority computation:  Re-compute when something changes - 
sample TPS, MAP and other sensors which have quick response at a
higher rate than slower-changing sensors such a water temp.

There are other.....

So what method(s) do the OEM use?



-----------------------------------------------------
<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
-----------------------------------------------------
               Bruce A. Bowling
  Staff Scientist - Instrumentation and Controls
 The Continuous Electron Beam Accelerator Facility
    12000 Jefferson Ave - Newport News, VA 23602
                 (804) 249-7240
               bowling at cebaf.gov
-----------------------------------------------------
<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
-----------------------------------------------------