EFI without a lookup table

[atsakiri at ford.com]

> Is it possible to have an efi computer control the engine entirely in 
> closed loop? I'd like to design a ecu which does not rely on having to be 
> dyno-tuned, or other ways where the engine has to run at different loads, 
> speeds, etc.

That would depend on what the variable(s) you're trying to control are.
Current table-based routines are attempts at achieving desired torque, 
power, emissions, and fuel consumption, plus many more less quantifiable
parameters like drivability, noise, shift quality, etc.

There is also, at least for mass-produced vehicles, to minimize cost.
That affects sensors, actuators, and computing power.  (Where is that
darn low-cost in-line torque sensor anyway?  :)  )

Add to this that engines behave very nonlinearly (just look at emissions
versus fuel/air ratio) and you have a very challenging problem.


> The rationale behind this is I want to be able to design the computer, 
> plug it in, and control the engine from day one.

Wow.  If you ever get to this point with a cost-effective design,
companies will line up to buy it.




Anthony Tsakiris

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The opinions expressed are my own and not necessarily those of my employer.