I ran in ev mode going 53mph

i find it hard to believe this thread is ignoring kinetic energy. if in neutral rolling down the hill, is that EV?

well its as EV as much as coasting down a hill in drive is more inefficient than EV mode is at any speed.

the real question that i see is

if kinetic energy is responsible for a Prius being in stealth mode at speeds greater than 42 mph, what classification is that?

the amount of energy it uses does not matter since it is not coming from the car. its gravity!!

 

Hi Dave,

I am not entirely sure I am following your argument.

Forward movement of the car results in negative spin of M/G (1). At an rpm of ~ 6500, mechanisms come into play to prevent higher spin rates that can damage the motor, and that is ICE spin. Are you suggesting that forward car movement can spin the ICE ?

If not, then ICE spin is either from fuel injection and it's burn, or possibly energy transfer from the battery.

 

yes that is what i am suggesting. there are many hills here that i have to brake to stay at a reasonable speed on the freeway. i find it hard to believe the car would be drawing electricity or gasoline when the car is essentially coasting down a hill in drive.


what is the difference between EV and regen?

they are not the same. what is the speed limit for regen??

the lower limit is 8 mph. there is no upper limit and that is essentially what windstrings was experiencing

 

Windstrings I have seen on the MFD what you have seen on my first drive on the car coming down off the 4the of July pass at 65 mph. I have to say that the MFD lies, or at least simplifies, what is going on with the Prius. True but not true. Some of the details have been posted here and I have to say I am not yet sure what it means, but your observation is a good one based on the data you can get. Each of us is touching the Elephant blind and telling each other what we feel. With enough of us and enough tools we will describe the Elephant.

 

Hi Dave, I'm back.

The kinetic energy is not FREE. It was created by burning gasoline previously.
The down hill energy or the potential energy is not FREE too. It was created by going up hill previously.

To let the ICE spin, we need some torque.
The torque to the ICE are supplied by MG2(72%) and MG1(28%).
The 72:28 ratio does not change.
Let's say the 72% of torque to spin the ICE is supplied by the kinetic energy, but we also need to supply 28% of torque from MG1, which requires some electric energy.

Ken@Japan

 

Hi Dave, I'm back.

The kinetic energy is not FREE. It was created by burning gasoline previously.
The down hill energy or the potential energy is not FREE too. It was created by going up hill previously.

To let the ICE spin, we need some torque.
The torque to the ICE are supplied by MG2(72%) and MG1(28%).
The 72:28 ratio does not change at all.
Let's say the 72% of torque to spin the ICE is supplied by the kinetic energy, but we also need to supply 28% of torque from MG1, which requires some electric energy.

Ken@Japan

 

You say it is EV, I'm fine.
I don't want say it is not pure EV or pure stealth, which is the ICE is spinning, making noises and wasting energy.
I beieve the original poster of this thread did not recognize the ICE was spinning.

Ken@Japan

 

As many posters are writing, the MFD sometimes lies.

Ken@Japan

 

nothing in this world is free

 

the ICE is spinning all right, but it's not taking any fuel.

What's moving the car (and spinning the engine) is elettrical energy.

Therefore in my dictionary I'm in EV mode...

 

I have a scangauge and awaiting my CAN-view (stuck in customs). :angry:

 

if it's only kinetic energy moving the car I get no arrows.

even at high speeds (above your 42 mph) there is a very small gap between having green arrows (regen) and yellow arrows (EV-mode) as it is very easy to get the engine being fed.

Today I managed in getting EV-mode af 50+ mph for many miles in a very slight downhill, but not enough to keep a conventional car at that speed in neutral: I know that road too well.

 

I wish you would go on in not leaving me knowledge thirsty...

 

Would you please explain why the "EV mode switch (UK model)" has to be canceled at 30mph?
If you could be in EV mode at any speed, it does not have to be canceled.

Ken@Japan

 

Y'all are describing "warp stealth", one of several names for the
condition. http://priuschat.com/index.php?showtopic=15817 ...
the accelerator-response "knee" gets much larger when the SOC is
high, making it easier to hold the condition and actually push
the car harder on battery.
.
Normally, it takes on the order of a kilowatt to keep the engine
turning. No fuel is injected and pumping loss is minimized by
having the valve timing backed all the way off.
.
_H*

 

Yes. We have to communicate under the same defined terms, otherwise newbies will be confusing.

Are there any glossary and/or FAQ list on PriusChat?
- What is the EV mode?
- How fast can I drive in EV mode?
- Can I drive at highway, say 55MPH, in EV mode?

Ken@Japan

 

I agree. Let us define the terms we are using. There is a glossary here:
http://priuschat.com/Acronyms-and-Abbrevia...ary-t13051.html

"EV - electric vehicle, the EV button refers to getting the Prius into electric only mode via a control, bypassing the computer's control over the engine/motor." My definition of EV mode requires the use of the EV switch or button. It does not refer to ICE off conditions with or with out power transfer from batter to MG2.

"Stealth Mode - (also "EV mode") driving the Prius on electric power only" I would like to argue that we should modify this so as not to include electric operation via EV Button. Hyper Stealth has been used to describe this behavior at speeds over 42 mph.

I think we should work on both definitions limit EV mode to that mode entered with a EV button. The language in the definition "bypassing the computer's control over the engine/motor" is wrong it is directing the computer to suppress ICE on and just use the battery and MG2. Stealth should be edited to remove EV mode as it creates confusion quickly no one knows what anyone is talking about. Either that of finding a new name for operating the car with a EV button. Thoughts.