Is this normal? Warm-up related

how long did yours take? what was the weather like?

 

I think the time for warm up may vary depending on the ambient temp, and warm up RPM. When the coolant hits 130°F, the ICE will shut off if its not needed for more power. I've never seen it warm up to that temp in much less than 5 minutes, even when the ambient temp is high. Generally, even when the ambient temp is over 90°F outside, the water temp of the engine will be less than that.

On what passes for colder mornings (which around here haven't been much lower than 55°F since I took delivery in April) the water temp hasn't been lower than the ambient temp in my experiences. In those cases, the ICE takes from 5-10 minutes to warm up. If ICE isn't engaged until I hit the freeway, the higher RPM seems to warm the coolant faster, but since I'm traveling at a higher rate of speed, the ICE stays engaged unless I drop below 63MPH.

And after 30 miles, unless I've made an intentional move to conserve battery - by running HV mode - I'm not able to get into EV mode, except for golf cart mode using the hybrid section of the battery (<40MPH)

 

at 53 degF this morning, it took mine 2 miles to Warmup the ICE and allow EV again.

 

Mine doesn't take long at all. Turn off the heater / ac if you don't want it to continue to run. Mine cuts out almost immediately when I do that.

 

Mine doesn't take long at all. Turn off the heater / ac if you don't want it to continue to run. Mine cuts out almost immediately when I do that.

 

That's only if you are driving slow. It takes half that time at 70 mph, same temp.

Yesterday's commute home at 39°F going 40 mph, it took just under 5 minutes.

We should avoid generalizing and collect more data. Temperatures below freezing should be interesting.

 

i'm not following this thread very well, but i can say that with temps in the 50's, if i need to start the cold ice. it takes a minute or two to warm up and shut off.

 

that sounds about right. the car must complete the warm up cycle before you can drive with ice off.

 

if the ice comes on, after you have had it off for one minute, it must complete the warm up cycle. however, unless it is extremely cold out, it probably won't come on unless you want it to or are out of ev miles. and if it does come on, the warm up cycle is significantly shorter because the ice is already warm. it just has to get above the temp bfd mentioned.

 

Raimix,

What is Golf Cart Mode ???

 

ev in hv mode.

 

Yes this is normal. I wondered at first if it was normal as well. It kind of pisses me off. If I have to make an L.A. traffic maneuver and the ICE comes on it stays on for 1-2 minutes.

 

The purpose of keeping the system warm is to minimize emissions. That is a high priority for the design of Prius. Toyota has spent quite a bit of effort speeding up the heating process.

 

Without going in to to much detail, the answer is it depends, basically the ice will kick on for several reasons, once on it will warm up to the operating temperature, I think it was 130 degrees. as the posts above state, when it is cold it can take as long as 5-6 min. I have read of ways to trick the ice to shut off early, but the con to that is there is excess moisture that will build up and do more harm then trying to save some gas... here in hawaii i can get to temp in a about 2 minutes, being that I start off at 80 degrees.

Getting into EV mode once you deplete, is hard for the most part, (you need a long hill), what I have been playing with the last 2 or so weeks when I know I will deplete EV, before I get to where I need to go. I regen prior to depleting remaining EV. using the pulse and glide technique, I have hills and straight aways to help the process, so its speed up or go up hills in HV, and coast in EV, the regen build the EV range, what I noticed is I get better MPG upwards of 100 miles by doing this, where before I would deplete my EV range then go full HV the rest of the way. I would get 60-80 MPG...

I cant explain why, just thats what I noticed so far... I just started this testing this theory...

 

Hmmm, I'm still a 2 week newbie with my car but my PiP doesn't exhibit what you say, exactly. With the EV mode battery exhausted I exit the freeway in HV mode. Once I slow to about 40 mph, the ICE shuts off. If I press lightly enough on the pedal, I usually make the 2 mile run to my destination on electricity alone in HV mode. It helps that my exit is downhill. Every once in awhile if I press a little too hard after the red light, the ICE kicks in and won't shut off until I'm nearly at a stop. I realized that the ICE stays on because it thinks I still need the power so it stays on in the ready regardless of pedal pressure. So everytime I "mess up" and the ICE comes on, I let go of the pedal completely. It shuts off immediately and I can coast in EV or even speed up in EV.

I fully admit, I'm still green on my PiP so I may be mistaken. But so far, my understanding is if the ICE is already warm, it doesn't need to go through the warm up cycle. Seems kind of a waste if it would have to and my PiP doesn't exhibit this behavior so far as I know.