1.8L Prius ICE 'idle' fuel consumption

[bwilson4web]

Hi,

When a Prius is over the hybrid threshold, 42 mph for 1.5L and 46 mph for the 1.8L, the control laws require the engine continue to run. By shifting into "N", all power to and from the two motor generators is removed and the engine controller will continue to run the ICE with no load . . . it is at the closest the engine can be to idle:

Time_stamp	MPH	RPM	MAF (gm/s)
02:18:02.381	69	1130	2.28
02:18:03.865	70	1152	2.28
02:18:05.334	70	1152	2.29
02:18:06.802	70	1152	2.48
02:18:08.271	71	1152	2.20
02:18:09.771	72	1152	2.50
02:18:11.240	73	1184	2.64
02:18:12.709	73	1179	2.29
02:18:14.177	74	1191	2.17
02:18:15.646	75	1184	2.29
02:18:17.115	75	1184	2.59
02:18:18.599	76	1184	2.68
02:18:20.068	77	1184	2.62
02:18:21.552	78	1184	2.14
average_value	73	1169	2.39

So using this set of data, we can calculate:

2.39 gm/sec air
(14.7 stoich ratio)
0.1625 gm/sec fuel
(3,600 sec/hr)
585 gm/hr fuel
(2,659 gm/gal)
0.22 gal/hr
(73 miles/hr)
331.7 miles/gal

Bob Wilson

[bhazard]

Dude if you think you're gonna fare better in a head-on with a full-frame econoline you're just kidding yourself. For one thing theres not much sheet metal in front of you. Another thing is you have a thick steel frame. Whats that gonna do? Well it will transfer the impact to the other vehicle of course, and also, to you. Its well proven that a vehicle that folds up like a pop can is better. I would much rather have the body of my car absorb an impact than my spinal column.

[RobertSmalls]

I wonder how it compares to the previous gen's 1.6L.

It's easy to make an Insight idle, in which case it burns 0.11gph. I should repeat that trial with the headlights on and see if it's 0.13gph like I predict. Hmm, could it really be 0.09gph with zero 12V load instead of the 200W base load?

Originally Posted by bwilson4web

(Sorry, I don't understand Ecomodder tables.)

That's fine, I understand text tables quite clearly. If you want a monospaced font, that's [ code ] [ /code ]

If you must have a table, I recommend Free BBCode Table Generator Tool

[bwilson4web]

Originally Posted by RobertSmalls

I wonder how it compares to the previous gen's 1.6L. . .

I'll go back and try it again. I get so frustrated when a tools defaults to "wipe out your previous data" without a prompt.

Thanks for the table tip . . . I'm not sure it is any better due to the larger number of gratis line feeds.

Bob Wilson