Pulse and Glide shouldn't work vs. Cruise control
#22
01-12-2006, 09:53 PM
Re: Pulse and Glide shouldn't work vs. Cruise control
Originally Posted by xcel
___Sitting at a stop and then coming to a stop isn’t really a P&G at all. Accelerating at an optimal rate (just below assist) not very fast and not dead slow but with a FAS at just the right moment so that you are actually crawling up to that stop sign ahead will allow the highest FE in that situation. ¼ mile? Screw the Glide. Maybe a 2,100 RPM acceleration rate for about ¾ of a block and FAS all the way in would yield an easy 100 + mpg’s. Where stop lights and signs to be crawled into are concerned, you have to consider a FAS with any IMA based hybrid. Anything else is just wasting fuel.
#23
01-12-2006, 09:58 PM
Re: Pulse and Glide shouldn't work vs. Cruise control
Originally Posted by xcel
___Sitting at a stop and then coming to a stop isn’t really a P&G at all.
Another complication is that at least in the HCH-II (I have no experience in any other hybrid), accelerating at anything over 1500 RPM (veerrryyy slow) results in at least a bar or two of assist.
#24
01-12-2006, 10:01 PM
Re: Pulse and Glide shouldn't work vs. Cruise control
Originally Posted by ElanC
I don't see the point of FAS when simply taking your foot off the gas pedal puts the ICE in valve-shutoff mode.
#26
01-12-2006, 10:24 PM
Re: Pulse and Glide shouldn't work vs. Cruise control
Originally Posted by NASAgineer
With a true FAS, the CVT is in neutral and the crank is not spinning, so there is less friction loss compared to valve-shutoff mode. The glide will go farther (not sure how much though). To me it's usually not worth the extra gyrations.
If you're in a hypermiling competition every ounce of gas matters. Otherwise it's not worth the trouble. There's another issue with the HCH II. When you shift to neutral the ICE powers back up. So there's a loss which you have to make up, both before FAS and when you come out of FAS.
#28
01-12-2006, 10:32 PM
Re: Pulse and Glide shouldn't work vs. Cruise control
Originally Posted by xcel
___Although we may have gone over this already, I have a feeling you will find a particular SoC where you will lose assist on any and all accelerations.
