Weichai Power Unveils World’s First Diesel Engine with 53.09% Thermal Efficiency

[Logic]

Serial Hybrids:
https://www.youtube.com/@EdisonMotors/videos
NB; all the videos.

for the pretty pic:

https://www.youtube.com/watch?v=WVO1Lh7AK1I&t=17s

No aero to speak of. Just an easy and cheap to fix and maintain logging truck EV, with a genset..!
(ye; all that constant rpm and load aerohead is speaking about
and
Empty up the mountain, loaded down the mountain + regen..)

[redpoint5]

Series hybrid might be the way to go with trucking, just as is done on trains. Next question then is at what weight or driving cycle is a series design better than parallel?

[freebeard]

An inspiring story.

No aero to speak of.

I think aerohead would approve of the standoffs for the rear view mirrors. It's got low frontal area and front wheel spats.

[Logic]

Originally Posted by redpoint5

Series hybrid might be the way to go with trucking, just as is done on trains. Next question then is at what weight or driving cycle is a series design better than parallel?

Ye that's a really good question!

The Koenigsegg Regera uses a torque converter with lock up to '7th gear' the wheels and a generator to drive 2 motors for pullaway and to top up a small 'regen battery'
it's a clever idea to get both (series parallel) and does pretty well for what it is, but it's not an eco car.
The numbers may still be worth looking at though. if one can find them.

Some numbers here at the end of the video, but this guy is more interested in making money on YouTube than actual engineering. And that's a good thing in his case IMHO

https://www.youtube.com/watch?v=5Qu-BDixGYY

That's his latest vid. There are other vids.

Probably the best implementation with reduced lightened battery is the Obrist Tesla:
https://www.youtube.com/results?sear...=Obrist+Tesla+

Interesting engine too:
Damn good way to do a large cylinder offset with no vibration..!
Pity Obrist seems to consider that little nugget of information a state secret for some crazy reason... or... it hasn't occurred to him..!?

For those new to offset cylinders:
That's when the cylinders aren't directly above the crankshaft but offset to the side some so that the conrod is more vertical during the power stroke, giving less friction and more degrees of power stroke etc:

https://www.youtube.com/watch?v=gwtZkHoVMso

[freebeard]

A One-Year Update on Edison Motors | Everything Electric Canada 2024

Big ol' Scania motor.

[cRiPpLe_rOoStEr]

Originally Posted by redpoint5

Series hybrid might be the way to go with trucking, just as is done on trains.

Most of those giant dump trucks used on mining sites also rely on serial hybrid powerplants.

Next question then is at what weight or driving cycle is a series design better than parallel?

Sure the weight difference between a serial hybrid setup and a more conventional driveline, which could be fitted to either a non-hybrid or a parallel hybrid, is also significant. Once a scaled-down ICE, generator, battery pack, wiring and direct-drive electric motor become lighter in weight than a large engine, transmission and driveshaft (some big-rig engines are really heavy), just like it's the case for those mining field trucks, efficiency tends to increase.

[aerohead]

Originally Posted by redpoint5

Series hybrid might be the way to go with trucking, just as is done on trains. Next question then is at what weight or driving cycle is a series design better than parallel?

You might go to SAE International's website and do a search there. They typically have an abstract for every paper, free to peruse, that often provides enough information such that there's no need to purchase the paper.
BMW and GM have both offered serial-hybrids, and they might have published answers to your questions.
The 'serial' Gen-II VOLT gets 37-mpg, driving coast-to-coast.
The 'parallel' Prius does the same @ 55-mpg.
Exploring the specific differences between the two vehicles might 'flush out' the explanation.

[Logic]

Obrist...Tesla consists of a two-cylinder, 1.0-liter gasoline engine ... claimed to deliver fuel consumption of just 2.0 lt/100km (118 US mpg/141 mpg Imperial).
https://www.carscoops.com/2021/09/ob...a-into-a-phev/


At a guess I would say an economical series hybrid should ask you where you're going, GPS style (with saveable/selectable favorites), before you leave.
Then it's computer can work out just how much and where the ICE should come on.
ie:
Know that for eg: its a std commute to work where you will plug in to charge.
(saved to/selected from favorites)
Or that you are just nipping to your local cafe quickly (close) and there's no reason to come on at all.

The computer might even log these trip's to better learn just how much regen you will be getting and where you will be flooring it up a steep hill, etc.
ie: learn your normal routes.

Another issue with series hybrids is cold starts.
I would guess that, during a longer trip, it should come on often enough to avoid cooling down too much.
Coming on during most all accelerations to minimize amp draw from the battery (increasing it's lifespan), is probably the way to go.

In short: (What everyone is calling) A.I... for economy...
E.I!

But at the end of the day, only the driver really knows whats actually going to happen ahead of time...
So being able to press an on switch because you're about to race a Lambo or something is a necessity! IMHO.

[aerohead]

Originally Posted by Logic

Obrist...Tesla consists of a two-cylinder, 1.0-liter gasoline engine ... claimed to deliver fuel consumption of just 2.0 lt/100km (118 US mpg/141 mpg Imperial).
https://www.carscoops.com/2021/09/ob...a-into-a-phev/


At a guess I would say an economical series hybrid should ask you where you're going, GPS style (with saveable/selectable favorites), before you leave.
Then it's computer can work out just how much and where the ICE should come on.
ie:
Know that for eg: its a std commute to work where you will plug in to charge.
(saved to/selected from favorites)
Or that you are just nipping to your local cafe quickly (close) and there's no reason to come on at all.

The computer might even log these trip's to better learn just how much regen you will be getting and where you will be flooring it up a steep hill, etc.
ie: learn your normal routes.

Another issue with series hybrids is cold starts.
I would guess that, during a longer trip, it should come on often enough to avoid cooling down too much.
Coming on during most all accelerations to minimize amp draw from the battery (increasing it's lifespan), is probably the way to go.

In short: (What everyone is calling) A.I... for economy...
E.I!

But at the end of the day, only the driver really knows whats actually going to happen ahead of time...
So being able to press an on switch because you're about to race a Lambo or something is a necessity! IMHO.

On the Chevy VOLT, cross-country trek, the engine ran continuously. The battery was essentially 'dead' after 53-miles.
In 'EPA COMBINED' cycle driving, regen may constitute 20% of the total range, as with the BOLT.
For EPA HIGHWAY cycle operation, I have no data.
And the way I drive on the highway, it probably wouldn't resemble the EPA dynamometer cycle.
On the 700+ mile drive from New Mexico to home, the Interstate grades were so gentle, I observed regen only 'twice.'
Many unknowns!

[Logic]

Originally Posted by aerohead

On the Chevy VOLT, cross-country trek, the engine ran continuously. The battery was essentially 'dead' after 53-miles.
In 'EPA COMBINED' cycle driving, regen may constitute 20% of the total range, as with the BOLT.
For EPA HIGHWAY cycle operation, I have no data.
And the way I drive on the highway, it probably wouldn't resemble the EPA dynamometer cycle.
On the 700+ mile drive from New Mexico to home, the Interstate grades were so gentle, I observed regen only 'twice.'
Many unknowns!

The 'new 'Chevy' asks where you're going, how fast you want to get there and if you will be able to plug in on arrival and for how long.
Looks at a map:
" Hmmm... towns n robots here gives us around ?? kwh of regen and the downhills here, here and here... so we need xyz kwh to get there, the battery's been plugged in? so we're engine on for ???km of the trip.
Best place to be on to help with battery amp draw is here here and here.
Did I miss anything?"

Direct drive on the flat bits.

"Check"

We're in a hurry.

Pulling away: "we-we-GRRRRRRRRRRRRRRRRRRRRRRRRR...!"

What the hell did you put that on for!?

"Because you're always ..'late!' and you forgot to plug me in again!"

****!
Why didn't you remind me!?

"Because you muted me again! you horrible sh "