Hi All:
___P&G is great for a Prius II and the other HSD equipped hybrids because they have this capability designed into them although I do not think Toyota thought it would be taken to the extreme at it has
Without ICE off, you probably aren’t gaining much over a straight “DWL”. Sirkut, that is what you are performing. The HCH, Insight, AH, and any non-hybrid has the crap beat out of them when running a continually repetitive P&G technique for any lengthy distance. The CVT based transmissions in particular and AS logic was not designed to perform this technique although it could have been …
___Hot Gerogia2004, using FAS’s like you always have mimics P&G with the hills but it depends on your speed range(s)? P&G keeps you within a very tight band in the HSD equipped hybrids for maximum effect. I still have my doubts about hills but given what was achieved a few weeks ago, use the ICE’s lousy efficiency to accelerate on the flats and climbs where needed and let her glide down the backside all the while keeping within a relatively tight band truly worked wonders. FAS’ keep you in a much wider band (any top speed down to 0 in fact) with much higher top speeds when and where applicable. Another way to look at it, if you are outside lets say 25 miles per hour on the low side and definitely 41 miles per hour on the high end in the HSD equipped hybrid, you are in FAS territory. You can perform a FAS in a Prius II by throwing it into Neutral with a SoC above 3 bars and not pink and the rest of the ICE shutdown logic is made up. If you are within the speed bands and can keep up the repetitive nature, you are performing a P&G. In the HCH’s and Insight’s, any speed band will do but it has to be repetitive. It just isn’t as practical as you would have hoped in an IMA based hybrid or non-hybrid today is all. We will see what the 06 Civic has in store because with its EV mode, it may in fact be able to perform a P&G without all the tricks thrown at it?
___Zimbop, as mentioned above, you really do not want to subject your HCH to this technique for any lengthy period of time over the life of the vehicle. A FAS every 2 or 3 miles is one thing, a P&G sometimes as often as every 1 or 2 minutes is something the IMA based hybrids were really not designed for. In regards to the acceleration rates, I do not have any experience in the HCH with P&G although I hope to soon. In the Prius II, that ICE was so efficient no matter the rate of acceleration that it didn’t matter. You could accelerate at 40 - 50 mpg (slow acceleration per the instantaneous) or 17 - 23 mpg (relatively brisk per the instantaneous) and still nail an excellent segment as long as you received the Glide distance to offset the fuel burn on the Pulse and you performed the Pulse properly. You COULD NOT USE THE PACK for any acceleration/pulse and YOU MUST send current to the pack during any and all accelerations/pulses to maintain a std. 4 to 5 bars SoC in the Prius II. With the proper timing to avoid the lights, and a perfect P&G technique nailed down including some EV when necessary, you were guaranteed a 110 + mpg segment on that particular route when the temps were above 70 degrees. If I were running the HCH, I would keep my Pulse accelerations just below Pack use. I would need an hour or two to figure out what I would hope to be the best bands on the flats of an Illinois country road but that may differ vs. the hills and road you may be running in your area? I also do not think I would be P&G’ing from 55 - 65 and back either as the acceleration back up to 65 is a fuel sucking monster given you are in a very rough Aero-drag territory vs. a 45 miles per hour top speed in a normal P&G in an HCH.
___I do want to add that when following Dan Kroushl in his Prius II (we were in the chase Prius II) during the last segment of the Marathon Attempt, it was very hard to detect that he was actually cycling through the speed range. The normal ebb and flow of traffic along the stretch of road near Pittsburgh simply fit the P&G style to a T.
___Good Luck
___Wayne R. Gerdes
___
Waynegerdes@earthlink.net
Pulse and Glide
Re: Pulse and Glide
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT
I may well give it a shot. My commute to/from work is straight through downtown so that wouldn't work, but I think I can find plenty of instances in other driving where I could swing it, and it's all deathly flat terrain here which would bode well.
