James,

Correct, but apparently some ECU's are doing this.  My curiosity was=20
just the apparent long time after peak current is reached.

Anyway, what are, or what's causing those higher-voltage spikes in the=20
middle of the hold phase?

Also, isn't 270mOhm pretty large for a sense resistor?

Cheers,
-Neil.


On 12/16/2015 2:33 PM, James Holland wrote:
> I would take a guess that that injector was not designed to be used with =
a series resistor, I suspect that the resistor is limiting the power in the=
 injector too much during the peak phase and you may well find that at elev=
ated temperatures the injector will not open.
> I recently tested another low-z injector in a stock set up that consists =
of a high-load side driver with a 270mR current sense resistor feeding into=
 a comparator based circuit. The injector is 1.6mH, approx. 1.2R and opens =
in 640us. It behaves in the same manner as other low-z injectors that I hav=
e worked with.
>  =20
> http://www.rhinoman.org/rusefi/inj_4_51ms.jpg
>  =20
> regards
> James
>  =20
>  =20
>   		 	   	=09

--=20
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