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Old 08-16-2010, 09:23 AM   #1 (permalink)
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1.8L Prius ICE 'idle' fuel consumption

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 MPHRPMMAF (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

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Old 08-16-2010, 02:47 PM   #2 (permalink)
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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.
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Old 08-16-2010, 04:35 PM   #3 (permalink)
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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?

Quote:
Originally Posted by bwilson4web View Post
(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
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Old 08-16-2010, 06:36 PM   #4 (permalink)
Engineering first
 
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Quote:
Originally Posted by RobertSmalls View Post
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

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