My EV Driving ratio

The trigger speed for the ICE has nothing to do with an optimal speed, relative to the Cd, etc. In the PIP it is still more optimal to go much slower than 62 mph.

IIRC in the standard Prius the 42 mph trigger speed has to do with wanting the ICE spinning so that if it needed to fire it isn't starting from zero, thus not over torquing it and making the transition smooth. This was bumped up in the PIP...probably to give a better EV mph range and because they were over-conservative previously and showed that the 42 mph was very conservative.

Remember that every engineering decision isn't based on data we can see and measure on a new car. A lot of it has to do with long term wear and tear, maintenance, warranties, etc.

Mike

 

I am looking for data similar to what is included in the thread below but on the PIP in both EV & HV mode.

Most efficient speed for best MPG? | PriusChat

I decided to start a new thread!

 

My ChargePoint reports generally shows around 3.1 Kwh for a full L2 charge.

 

You might have mentioned this earlier, but what is the temperature at 6am when the car is charging? A cold soaked battery likely absorbed less charge in cold temperatures so in warmer summer weather you may see higher kWhs for a full charge.

 

He could also have a slightly worn out battery pack that does not completely charge/discharge.

Has Toyota described how the battery pack will age from a driver's perspective? Will the useable capacity be maintained, expanding the % of battery available to the user, or simply a reduction in the amount of energy stored per charge/discharge cycle?

 

Wow! I've never seen more than 2.95 kwh from ChargePoint L2. And only once more than 2.91 kwh.
Most days of the week I usually arrive the work with 0.5 - 1.5 miles remaining and only accept 2.6 - 2.8 kwh.
For example, today I had 0.8 miles out of 13.1 remaining and I charged 2.593 kwh.

It may be that the difference is that to get 3.2 kwh you need to use all the EV range and start using gas and use all the HV battery capacity as well without giving the ICE a chance to bring the battery back to its normal range. For my driving pattern I almost never switch to HV before I charge again...maybe has happened on a work commute 3 or 4 times out of 120 days with ~150 charges. When I know I am going to drive > 13-16 miles I usually switch to HV manually at some point and leave 1-2 miles of EV for the end of the trip returning home after getting off the freeway.

Mike

 

Lately it has been ~50F. But most of my charges are from ChargePoint at 10am (50-60F) or 5pm (55-60F).
But back in the summer I saw the same thing when it was 60-70F in my garage and 70-85F outside at the ChargePoint. My current EV range estimate is 13.1 miles...I can usually get 14. In the summer it was 14.6 - 15.0 and I could get 16-16.5 miles sometimes.

Mike

 

Mike, this is obviously the problem. You never actually fully discharge the battery. The EPA test depletes it entirely so that the car enters HV mode.
The difference between a "full" and "empty" HV battery is only about 5% soc, so that part doesn't really matter.

Edit: 1 mile of range, according to our spreadsheet, corresponds to about 0.25 kWh. With losses, that's closer to 0.3. 2.9+0.3=3.2, the number that the EPA got.
Mystery solved

 

No. I usually get to work with a bit of EV miles remaining. But when I say that I've seen 2.9 - 2.95 kwh charged these are when I ran down to 0.0 miles remaining. A few times I actually arrived after the ICE turned on 0.1 to 0.3 miles away. A few other times I arrived with 0.1 to 0.3 miles and I drove around the parking lot to get to 0.0 miles to measure the "full" charge. For example, today I arrived with 0.2 miles remaining and I took just 2.69 kwh with the L2 charger. Mike

 

As we all know from battery soc estimators, "0" isn't really 0 until the device dies. Anything less than the ICE firing up due to battery depletion is NOT a full charge.

 

When I have done a "test" measurement I have driven in EV til 0.0 miles remaining and the ICE came on. Or I drove til about 0.1 miles remaining and parked, left the lights and seat heaters on for a bit until the ICE fired off and turned off the car. I've done this (one of two methods) about 8 or 10 times and get about 2.89 - 2.95 kwh total charge. What I suspect is that the reserved HV portion of the battery is still "full" at this point.

Of course, since I don't have to, I don't want to drive around using some gas just so I can drain the battery a bit more since I'd have to go through the entire ICE warmup.

My commute is 6 miles each way, plus a small 2 mile side trip to the gym a couple of times per week. (Also a couple of times per week I may go 5 miles each way for some volunteer work...but then back to work to get a second charge). I am able to use zero gas for all these trips and only have to use gas once every week or two on a longer trip of some kind.

IMO, the useful EV-only range is what I am getting with ~2.9 kwh. The 3.2 kwh (if that is the number) requires using some gas at some point, since it requires going into HV mode at some point. If you are regularly driving, say 16 miles or more between charges then perhaps this is why some people are seeing 3.2 kwh for a charge.

This is just my working theory for how the car works. A few weeks ago I did a ~130 mile series of tests where I monitored every charge and recorded how many kwh the car reported consuming, etc. to attempt to find the charging losses. This would not be possible to do accurately if I went in HV mode on every charge. (As it was I did go into HV mode once and the small error didn't affect the measurments much).

Mike

 

brilliant! why dou your pics keep coming upside down?

 

Try taking it upside down!

 

Stand on your head when taking picture and everything will look right! Oh! in the car that is a little harder to do!

 

i did the accidental reset on my trip B ev ratio.
just wiped out the whole ~1500mile log.
Wish PiP logs EV ratio that you can't erase

 

Or if it would at least ask, are you sure you want to delete trip B info!

 

I am sure it will happen to me some day to!