No ICE at 46 mph?
#1
10-26-2007, 09:21 AM
My Wife's car but my toy!
Thread Starter
Join Date: Aug 2005
Location: Houston area
Posts: 111
No ICE at 46 mph?
I was driving to work this morning here in Houston. I noticed I was at a 46 mph using CC and I had no orange ICE indications on my display. The battery was green with 1 bar missing. I was on a flat street, most of them are around here are. I made it about 3/4 of a mile before I had to stop for a light. I thought that ICE was always on above 42 mph unless you are off the throttle decelerating.
#2
10-26-2007, 10:00 AM
Prius geek
Join Date: Oct 2004
Location: Rapid City, SD
Posts: 262
Re: No ICE at 46 mph?
The touch screen is not always giving the "full" picture. Above 42 MPH, the gas engine has to spin, but not nessarily burn gas. It has to spin so MG2 won't overspin it's RPM limit, due to the power-split's design.
some with scanguages/Can-views can see that a VERY small amount of fuel is burned at this point...but the touch screen 'arrows' typically will only light up if the engine is actually helping power the wheels.
Lots of other conditions when this could happen (like running the gas engine just to charge the battery or warm up emission components when parked), but in general that's the story.
some with scanguages/Can-views can see that a VERY small amount of fuel is burned at this point...but the touch screen 'arrows' typically will only light up if the engine is actually helping power the wheels.
Lots of other conditions when this could happen (like running the gas engine just to charge the battery or warm up emission components when parked), but in general that's the story.
#4
10-26-2007, 01:59 PM
Engineering first
Join Date: Oct 2005
Location: Huntsville, AL
Posts: 5,613
Re: No ICE at 46 mph?
I was driving to work this morning here in Houston. I noticed I was at a 46 miles per hour using CC and I had no orange ICE indications on my display. The battery was green with 1 bar missing. I was on a flat street, most of them are around here are. I made it about 3/4 of a mile before I had to stop for a light. I thought that ICE was always on above 42 miles per hour unless you are off the throttle decelerating.
Bob Wilson
power lumbar in the front seats?
#6
01-30-2008, 10:28 AM
Active Enthusiast
Join Date: Apr 2007
Location: Edmonton Alberta Canada
Posts: 219
Re: No ICE at 46 mph?
It's MG1 that can be over-spun. It's speed is directly proportional to wheel speed and inversely proportional to engine speed.
You were in "warp stealth". The engine was being spun by MG2 to protect MG1 but no fuel was being injected. It's difficult to get into this mode, but very gratifying when you do.
At this lowish speed the engine is spun at about 950 RPM ("idle" is about 1250 RPM with fuel being consumed). I use a Scangauge II and can watch the car drop to idle, then drop to 950 RPM with the fuel use dropping to almost zero (the Scangauge "estimates" fuel use if the engine is turning even though the ODBII codes say 0 fuel so I don't see zero fuel use). Those with Canview report 0 fuel use however in this mode.
You were in "warp stealth". The engine was being spun by MG2 to protect MG1 but no fuel was being injected. It's difficult to get into this mode, but very gratifying when you do.
At this lowish speed the engine is spun at about 950 RPM ("idle" is about 1250 RPM with fuel being consumed). I use a Scangauge II and can watch the car drop to idle, then drop to 950 RPM with the fuel use dropping to almost zero (the Scangauge "estimates" fuel use if the engine is turning even though the ODBII codes say 0 fuel so I don't see zero fuel use). Those with Canview report 0 fuel use however in this mode.
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