EFI without a lookup table

[Andrew Dalgleish]

On Monday, 11 March 1996 11:57, owner-diy_efi-outgoing wrote:
>
> > 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?  :)  )

How about a strain gauge on the tail-shaft?
Calibrating it might be a bear...

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

Regards,
Andrew Dalgleish
Senior Software Engineer
Axon Research, Pty Ltd
6 Wallace Ave,
Toorak, VIC
3142
AUSTRALIA
Tel +61-3-9826-5538
Fax +61-3-9824-0083