injus query for dcb

[ecoxantia]

Still working at calibrating the mpguino on the HDi diesel - I have a question about the "injus" variable.

Is it simply the microseconds that the injector signal is "open"?

I have had to add some signal conditioning including a variable resistor to get a believable reading as I think it was just capturing the pre-injection and not the main injection.

Still on your v0.75 code I'm afraid, in case that makes a difference to the answer!

thanks

[dcb]

I don't know of a variable named specifically injus", there are these below:
for instant trip, injHiSec never gets incremented (the trip gets reset every half second) and injHius is the number of microseconds that the injector was open during the last 1/2 second.

PHP Code:

  unsigned long injHiSec;// seconds the injector has been open      
  unsigned long injHius;// microseconds, fractional part of the injectors open 


.75 is the latest version, just added some instant speed fixes in .74 and .75 was basically documentation only.

[ecoxantia]

sorry, I meant injHius.

I find that injHius returns a sensible number most of the time (about 10,000 at idle in my case) but then returns a number about 80% of that expected, say every fifth update. I guess this is when the injector open time crosses two half-second measurement periods?

Oh and another typo- I'm on v0.70 not v0.75!

[dcb]

That sounds about right. That is why there is all the timing of individual pulses and stuff just for instant consumption and speed, otherwise it bounces around on the display.