2010 Prius 2ZR-FXE engine efficiency map

Hi All,

It was mentioned that 220 g/kWh is 35 % effienciency.

I looked up this: [ame="http://en.wikipedia.org/wiki/Brake_specific_fuel_consumption"]Brake specific fuel consumption - Wikipedia, the free encyclopedia[/ame] ,

Where it says for regular gasoline:

Regular gasoline = 18917 BTU/lb = 0.0122225 KW·h/g

Or, in other words 81.816 g/KWh.

So, 81.816/220 = .372 or 37.2 % efficiency.

And for 230 g/KWh - 35.6 % effiency.

 

Can anyone identify where this chart came from. It doesn't seem to mesh with the others shown.



Wayne

 

[ame=http://en.wikipedia.org/wiki/Toyota_ZR_engine]Toyota ZR engine - Wikipedia, the free encyclopedia[/ame]

Thanks Bob - that's very helpful - I don't have access to the papers you quoted, but I was reading the Wiki above and wondering why Toyota would not have included their new "valvematic" technology on the new Prius if it would reduce pumping losses. (my assumption based on the Wiki's assertion that "...The Toyota 2ZR-FXE is a 1.8 L (1798 cc) [ame="http://en.wikipedia.org/wiki/Atkinson_cycle"]Atkinson cycle[/ame] variant of the 2ZR-...", and not the 2ZR-FAE).

I don't see how late Intake valve closing reduces pumping losses? Does the 2ZR-FXE actually have valvematic? Not that I'm planning an engine swap or anything, I'm curious about just how much tech Toyota crammed into the ICE.

 

OK, given that the Prius doesn't have a tachometer, how do we know when we are staying in the "sweet spot"?
Based on my fuel results so far (c. 46 on the computer), I clearly don't know how to do it.

 

Anybody know the power curve for a cold 1.8L engine?

 

That wasn't the question.

 

Answering very old question of jprates about FE of diesels on Autobahn, I used to have VW Golf mk5 TDI 1.9 105hp (pump injectors, not current direct injection) and I was regularly crossing Germany. When traveling on an empty highway at rather constant speed of 170 h/km I was consuming about 8l/100km. "About" as I did not have a board computer and there were rather few tanks that I could burn traveling at rather constant speed (still some as I mostly drive in the night). With my Prius 3g I get similar consumption at 150km/h (speed and consumption this time according to board computer).

 

OK. I feel real dumb. Could someone point me to a link that would teach me how to read this?

Or explain it to me in English. Like, for best efficiency, keep the rpm as low as possible and never go above 2500 or something like that.

I have a 2010 Prius. This is way over my head

 

Don't want to further digging old posts, but 8l/100 in a Prius 3g I haven't heard of, even steady 150km/h, I promise to check other posts to make sure of what I am stating. And regarding fuel energy content, 8litres diesel is equivalent to 9litres gasoline.

 

Measured from a quite authoritative italian car magazine Quattroruote, these are the constant speed fuel consumption of the Prius 3rd gen 2010:

90 km/h, 56mph (99/61.6) - 26.8km/L, 3.7L/100km, 63mpg
100 km/h, 62mph (110/68) - 23.4km/L, 4.3L/100km, 55mpg
130km/h, 81mph (143/89) - 15.4km/L, 6.5L/100km, 36mpg
150km/h, 93mph (165/102) - 11.7km/L, 8,5L/100km, 27.5mpg

The speeds above are true speeds, not MFD speeds - which means you need to add about 10% for MFD speeds (written in brackets).
I had posted these values in another post, but it is lost in the chaos of ever increasing posts - I cannot find it anymore...
There is also a chart made by user Bob Wilson which is very helpful. I cannot find that either...

For comparison, whatever the value, my 2002 Polo TDI with 1.4L diesel turbocharged engine, 75HP, 195Nm max. torque, weighing about 250kg less than the Prius, would achieve (personal measurements, looking at instantaneous fuel consumption on highway - no CC to help...):
100km/h - 4.9L/100km
120km/h - 6.2L/100km
150km/h - 7L/100km
170km/h - 8L/100km

Speeds as per speedometer. I have never calculated its error.

 

Here you go:

http://priuschat.com/forums/gen-iii-2010-prius-fuel-economy/64296-updated-mpg-vs-mph-chart.html

 

If you could find me also a post with the torque vs rpm of the electric motor....

 

Electric motors don't work this way. You can have many torques for the same RPM. Because a motor's torque is a function of voltage, frequency, and current.

For instance, going uphill at 20 MPH or driving flat at 20 MPH, different torque, same motor RPM.

Edit: There will however, be a max torque for a given RPM given the motor's rating

 

This is what I am looking for - a curve that shows the max torque that can be delivered at a specific rpm. Is this curve possible to draw? is there one?