Mpg dropped considerably in the past week... - Page 4

hogweed · 7th March 2018, 17:36

Quote:

Originally Posted by T-Cut

The consumption estimate comes from the injector duty cycle and fuel pressure.

That's interesting... I didn't know the pressure varied...

My brain hurts too

klarzy · 7th March 2018, 18:36

Quote:

Originally Posted by hogweed

That's interesting... I didn't know the pressure varied...

My brain hurts too

That's why you have a fuel rail pressure sensor.... if it did not have the potential to change.... why have one....
It's this in part that the ron box attenuates...

T-Cut · 7th March 2018, 22:15

I doubt the pressure varies that much. The sensor checks it's high enough to run the engine and the regulator, err, regulates it. The 'map' referred to will provide the MPG vs injector duty cycle at constant feed pressure. I suspect a significantly varying feed pressure would render the management too complex.

TC

7th March 2018, 22:15	#33
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	I doubt the pressure varies that much. The sensor checks it's high enough to run the engine and the regulator, err, regulates it. The 'map' referred to will provide the MPG vs injector duty cycle at constant feed pressure. I suspect a significantly varying feed pressure would render the management too complex. TC