[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