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post #1 of 27 (permalink) Old 08-25-2005, 09:18 PM Thread Starter
 
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Default Is my Prius behaving properly?

All of you veteran Prius drivers out there: I have had my '05 Prius for six weeks now and love it - but I have some questions about how my hybrid system acts and want to know if this is what is "normal":

1) After start-up, the car will not allow me to do any stealth driving until it is warm-up sufficiently now matter what the SOC is.

2) Driving down the highway at 55mph what I typically see is pink arrows from the ICE to the wheels and MG2 and green arrows from MG2 to the battery. This seems like a lot of energy from the ICE going to the battery when all I have on is the radio and the fan (and all the other electronics such as the MFD and the dash panel). Sometimes I can drive like this for more than 20 minutes and not even get any little regen leaves on the consumption screen. This is pretty much constant except for some pulses of yellow arrows from the battery to MG2 and from MG2 to the wheels. This will only occur when the SOC is 6 blue bars.

3) Sometimes even after the complete warm-up and SOC of 6 blue bars I find that I can not go into stealth mode (and I'm not going over 40 mph). For example, today I glided for about 1/2 mile into a small town and came to a stop sign. I turned left and accelerated to 25 mph and still had a SOC of 6 blue bars but I could not get into stealth mode - it was either green regen arrows or the ICE. Sometimes this happens, sometimes it does not. Any input on that???

Thanx
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post #2 of 27 (permalink) Old 08-25-2005, 09:28 PM
 
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Default Temperamental Prius

Temperamental Prius

My friend, you will receive a million reazons why that behavior from different Priusilians in this forum, and not of them will give a real vertical answer.
You are dealing with first temperamental automobile in history. A lot of variables are involved to get an stable behavior. If you take care of them you will be called for Rehabilitation from the Priusilytis.
I am not going to give you a response/explanation/answer, I am just going to give you an advice for free:

DRIVE YOUR PRIUS AND ENJOY THE RIDE...YOUR CAR WILL KNOW WHAT TO DO AT ALL TIMES....
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post #3 of 27 (permalink) Old 08-25-2005, 10:55 PM
 
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Wow, you get color coded arrows on your display? I'm jealous, my 2001 display only has one color no matter how big or small the current.

Your car's behaviour sounds reasonably normal.

Anyway, RMarchena's right, the computers are handling a lot of real-time information and adjusting things to the proper settings for you. Nobody but Toyota's engineers knows exactly what they do or why. As Bill Powell used to say: "Just drive it".
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post #4 of 27 (permalink) Old 08-26-2005, 01:22 AM
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It sounds normal to me. I don't get "stealth" mode above ~30 mph unless on a significant downhill, the ICE normally runs long enough to warm up at the start of a drive regardless of driving conditions (to reduce emissions they say) and whenever the ICE is running to move the car and the battery is not, some amount of regen is going on (per the green arrow) but the SOC does not change by enough to notice in a short period.

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\"The Pod Racer\"
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post #5 of 27 (permalink) Old 08-26-2005, 08:20 AM
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One other thing you should know. The MFD does not indicate 100% of the time the ICE is running.



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post #6 of 27 (permalink) Old 08-26-2005, 09:26 AM
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Don't worry about it --- just drive it. Over time you will learn when you can act smarter than the computer and force the car to work slightly differently. Stealth is really not all that desireable as all energy comes from gasoline and there is an efficiency loss in going from rotational energy to stored energy and back to rotational. One of the few times it is worth trying to force EV mode is on a flat section just before you are going to power down the car. Since the car will insist on running the ICE after startup you don't really loose much in having a low SOC at this point. The only time you really want to regenerate hard is when you are going down a hill that has a red light or stop sign at the end. Here use the brakes to maximize regen is most efficient.
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post #7 of 27 (permalink) Old 08-26-2005, 10:02 AM
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As for some energy going to the battery on a high speed cruise, one thing to consider is that you are not able to see how MUCH energy is going in any direction. Consider the green flow to the battery as top-off energy.

I have often touted, even if only to myself, that not only should we be informed of direction of flow, but how much. As it is, the display is an oversimplification.

It was determined for the classic that in reality, the car does go into 'overdrive' by powering MG1 using MG2, thus allowing the ICE to run at a lower RPM. It hasn't been determined, to my knowlege if the 2G do that too.

Attilla, can you find out for us?
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post #8 of 27 (permalink) Old 08-26-2005, 10:34 AM
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Default Re: Is my Prius behaving properly?

Quote:
Originally Posted by eric29730
1) After start-up, the car will not allow me to do any stealth driving until it is warm-up sufficiently now matter what the SOC is.
Yup, normal. You'll notice that your fuel economy is very low in that first 5 minutes or so as well. The A/F mixture is quite rich as more energy is being used to heat up the emissions control systems during that initial few minutes.

Quote:
2) Driving down the highway at 55mph what I typically see is pink arrows from the ICE to the wheels and MG2 and green arrows from MG2 to the battery. This seems like a lot of energy from the ICE going to the battery when all I have on is the radio and the fan (and all the other electronics such as the MFD and the dash panel). Sometimes I can drive like this for more than 20 minutes and not even get any little regen leaves on the consumption screen. This is pretty much constant except for some pulses of yellow arrows from the battery to MG2 and from MG2 to the wheels. This will only occur when the SOC is 6 blue bars.
Here's the thing, energy will not go to the battery just to replace what you're using. The ECU tries to keep the ICE running within it's most fuel efficient rpm range. That may produce more power than is necessary to maintain your 55mph cruise speed. In that case it sends the excess energy to the battery for future use.

Also, if you are driving without slowing or stopping your should not see any regen leaves. Those only occur from coasting/braking. IMO, the fewer regen leaves the better. Think of it this way, if you never use the brakes and never coast (ie. just glide) you're taking maximal advantage of the kinetic energy produced by your ICE. The regen is only advantageous in that it's more efficient to recapture some of the kinetic energy than none of it when the reality is you must use your brakes to stop.

Quote:
3) Sometimes even after the complete warm-up and SOC of 6 blue bars I find that I can not go into stealth mode (and I'm not going over 40 mph). For example, today I glided for about 1/2 mile into a small town and came to a stop sign. I turned left and accelerated to 25 mph and still had a SOC of 6 blue bars but I could not get into stealth mode - it was either green regen arrows or the ICE. Sometimes this happens, sometimes it does not. Any input on that???
Yea, me too. And I'm often hard pressed to explain why that happens. I will, if under 35mph, sometime use my EV button just to force the ICE off and that seems to keep the system happy.

A few folks have used the Idle Speed Recalibration and found some improved ICE performance and more rapid shut off of ICE when appropriate. I'll post those instructions below in case you're adventurous enough to try it. I haven't, but reports from the few folks who have have been positive.

"Idle Speed Calibration Learning Procedure"
Get the car good and warm (coolant
needs to be 83C, which I'm told takes a good long drive to hit). I
think it can also be reached by putting the car in Park and
stepping on the gas pedal to run the engine for a while.

Once the car is warm, put it in Drive, then with your left foot on the
brake, step the gas pedal down to about 75% power. Keep it
there for more than 30 but less than 40 seconds. The engine will
be force charging the battery during that time.

Then, power the car down, wait a little longer than 5 seconds, put
your foot on the brake and hit the Power switch again. Let the car
go through its normal startup routine in Park until the engine
stops.

Evan Fusco, MD
'04 BC/Seaside
Nixa, MO http://greenhybrid.com/compare/milea.../signature.png
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post #9 of 27 (permalink) Old 08-26-2005, 11:16 AM
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Does that apply to the new Prius, or only the classic, or unknown?
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post #10 of 27 (permalink) Old 08-26-2005, 02:08 PM
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Quote:
Originally Posted by DanMan32
Does that apply to the new Prius, or only the classic, or unknown?
AFAIK only for the 2G Prius and NOT the first gen ('01-'03). It also applies to the Lexus 400h and Highlander Hybrid.

Evan Fusco, MD
'04 BC/Seaside
Nixa, MO http://greenhybrid.com/compare/milea.../signature.png
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