2010 Prius 2ZR-FXE engine efficiency map

[usbseawolf2000]

Originally Posted by ken1784

Please note that the 1.8L engine's rpm number, for the 40kW output, is lower (3650rpm & within 230g/kWh area) than 1.5L's (4000rpm & out of 230g/kWh area).
I believe the vehicle cruising speed by 40kW is approx 95mph, and we can see the turning point at 4000rpm to get more torque than efficiency for higher speed.
It looks Toyota is trying to compete European diesels on 90mph cruising German autobahn.

Heck, even 50kW (1.5L's max) is still in the 230g/kWh region. Look at the torque boost at 4k RPM. I wonder if that can be felt like when V-Tec kicks in.

[ken1784]

Originally Posted by jprates

Ken, can I ask you the favor to ask your friend permission to post these same pics on my Portuguese speaking site Prius-PT.com?

Hi João,
He agreed to post them on your site.

FYI,
The charts came from Toyota's article titled "Development of New 1.8-Liter Engine for Hybrid Vehicles" which was published at JSAE academic conference in May 2009.
Maybe, we'll see them on some of the US SAE papers.

Ken@Japan

[ken1784]

Originally Posted by bwilson4web

Do our Japanese Prius friends with NHW20s and NHW11s try to keep their engine rpm in the region of the peak BSFC chart or lower than 2,600 rpm?

Hi Bob,

Our hypermilers never drive highway (above 42mph).
I believe they rarely see above 2,300rpm on the pulse portion of P&G.

Ken@Japan

[Tideland Prius]

Originally Posted by ken1784

Hi Bob,

Our hypermilers never drive highway (above 42mph).
I believe they rarely see above 2,300rpm on the pulse portion of P&G.

Ken@Japan

wow... that is a "weak" pulse. I'm sure my pulsing isn't below 2,300rpm... uh oh haha. Should I keep it below 2,300rpm?

[ken1784]

Originally Posted by Tideland Prius

wow... that is a "weak" pulse. I'm sure my pulsing isn't below 2,300rpm... uh oh haha. Should I keep it below 2,300rpm?

I think it's on you. Drive your Prius on your traffic environment.

Anyway, following is some data collected by one of Japanese hypermilers driving his training road, 20 mile loop (no altitude change between start and goal points).

pulse: 20% of total distance, up to 45km/h, 2,000-2,200rpm, 26mpg
glide: 80% of total distance, down to 35km/h, using N shift gliding
results: 130mpg on his 20mile training road

Ken@Japan

[FireEngineer]

And I thought I was a bad driver when my pulses went above 1800 RPM.

Wayne

[bwilson4web]

Originally Posted by ken1784

. . . Toyota's article titled "Development of New 1.8-Liter Engine for Hybrid Vehicles" which was published at JSAE academic conference in May 2009.
. . .

Got it! Thanks!

The paper identifier: 2009-01-1061

Good read although I have some questions.

Bob Wilson

[Tideland Prius]

Originally Posted by ken1784

I think it's on you. Drive your Prius on your traffic environment.

Anyway, following is some data collected by one of Japanese hypermilers driving his training road, 20 mile loop (no altitude change between start and goal points).

pulse: 20% of total distance, up to 45km/h, 2,000-2,200rpm, 26mpg
glide: 80% of total distance, down to 35km/h, using N shift gliding
results: 130mpg on his 20mile training road

Ken@Japan

mmm ok... yeah I P&G from 60-40km/h (the speed limit is 50km/h). Maybe that's why.

[jprates]

Originally Posted by ken1784

I think it's on you. Drive your Prius on your traffic environment.

Anyway, following is some data collected by one of Japanese hypermilers driving his training road, 20 mile loop (no altitude change between start and goal points).

pulse: 20% of total distance, up to 45km/h, 2,000-2,200rpm, 26mpg
glide: 80% of total distance, down to 35km/h, using N shift gliding
results: 130mpg on his 20mile training road

Ken@Japan

I wonder how people have patience and time do do this.

I also wonder how busy that train road is... I bet it is a desert... Driving like that would be a tremendous hazard for traffic, no doubt I would be crucified (rightly so!) by the other drivers on the road!

[Tideland Prius]

depends on the road. I've done 65-45 on a 70km/h road. The only reason why I could do it was because it was just before rush hour so the road is fairly empty and any traffic could use the left lane to overtake me (it's two lanes each way).