Do diesel hybrids make any sense?
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- čas přidán 2. 05. 2017
- Why aren't carmakers making diesel hybrids? Cooley explains.
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A very small two or three cylinder diesel with a direct shaft into a 7k - 10k generator and four traction motors. Diesels do their best work at a particular RPM, and coincidentally so do generators. Diesels also have great torque which helps under heavy loads like standing starts and accelerating. Additional assistance in that area can be found with a couple of extra batteries, or super capacitors. It's cheap and doable with mpg around 75 to 80. If anyone tells you differently, they're lying.
This is exactly what i was thinking. Why don't we use a small 10kw deisel generator, super efficient, whose purpose is just to supply power and charge batteries for the electric drive train. Add in a deisel flex fuel system that allows use of both bio deisel or regular deisel. And bam. Your hybrid even uses a biofuel now. :) .... now if only we all had money lol.
It’s a fact diesel generators out perform gas.
So basically like how a diesel electric train works.
I wanna see someone do this
@@NickOvchinnikov The big three (Ford, Chrysler, and GM) did it already back in the late 90's.
The redundancy argument would be valid if both powertrains drive the wheels. However, if you are designing an electric vehicle with an internal combustion engine driving a generator (range extender), I don't see why that internal combustion engine can't be a small diesel.
Andrew Van Beek This! so like a Volt kind of concept. Did not get the redundancy comment either
The problem with that setup is that it's only more efficient in certain applications, because converting mechanical energy into electricity, charging a battery and then converting electricity from the battery back into mechanical energy is not very efficient when compared to driving the wheels through gears. Even the engine in the Volt drives the wheels through a mechanical connection under certain conditions. Also, when the Volt is running purely off of gasoline, it's about as efficient as a Plain Jane gasoline vehicle.
Andrew Van Beek the Chevrolet Volt and BMW i3 are both range extended EVs. one uses a small inline 4 gasoline the other uses a motorcycle engine. Both of those internal combustion engines make more sense due to weight because even a small diesel is heavier then it's had counterpart and because of application, the generator works at low steady RPMs where mid range torque is unnecessary and inaccessible
My thinking exactly!
That is actually how many diesel trains, boats and mining equipment work. Its called diesel-electric transmission. Its mostly used in boats because directly coupling the propellers to the engines proved heavier and less reliable than this system.
It essentially boils down to being an electric version of a PTO on a tractor. where instead of using hydraulics to avoid the issues involved with clutches, it uses electricity.
With that said, not all diesel electric transmission uses batteries. some use the generator to directly power the electric motors mostly because the batteries required for the scale of power they would need would be massive and thus in that particular application less efficient
I've often fantasized about taking an EV and just adding like a little 1.0L diesel generator as just that, a backup power source if say I wanted to take a long trip or something. I can't imagine it adding THAT much weight to an already overweight EV.
Nissan Epower
WHY DON'T YOU JUST SAY IT'S POLITICS AND STOP THE BULLSHIT
@@Michael-ge3eo Why don’t you get it through that thick skull of yours that not everyone wants to pay absurd gas prices because of inflation?
I disagree. Much of the electric generators are powered by diesel. Why wouldn't this transfer to a hybrid vehicle, since the motor tends to be more of a generator than a direct power source?
Exactly! you got it. If you build it, they will come.
I hear diesel hybrid and I instantly think locomotives.
That's a good thing for efficiency
Same bro
Trains are better than cars for efficiency.
I think cruise ships
Yup, one of the best transport methods on earth
why not a small diesel as a range extender !?!?!
Diesels need to warm up for optimum combustion performance, a cold diesel will run very inefficiently
@@AmeriaUprising then program the diesel to run intermittently to maintain warm temperature. With high btu, simply running it on closed thermostat under load (to charge the battery) should easily put it in optimum temperature
In Europe, you also can buy some Peugeot diesel-hybrids......
Electric cars are efficient for town driving, but suck at hyw driving. Where as diesels are efficient at hyw driving, but not good for town driving. A hybrid would get the best of both worlds. That why I think it would be a good idea.
Electric cars are still more efficient on highways. The drop is big enough to reduce range though. All that is required is a range extender.
the aim of hybrids is to be cleaner than 100% ICE vehicles & diesels are just dirtier than gas, so a gas hybrid is cleaner than a diesel hubrid in a vehicle
@@HSstudio.Ytchnnl diesels are not dirtier than gas engines. Gas engines are dirtier than diesels
Where's the full episode?
yeah I haven't seen a full on cars episode in a while :(
Diesel-electric trains are norm.
+Mladen Milić Diesel-electric trains aren't hybrid though. The electric transmissions just send power, they are not creating the motive power.
those are technical "series hybrids" the Chevy Volt and Fisker Karma are series-hybrids, but gas/electric, wheras most hybrids like the prius are parallel hybrids and get locomotion from both gas and EV sources.
@Spamfried
not exactly. Diesel trains are hybrid in terms of having both a diesel generator and electric motors for propulsion, the motor is the thing moving the train. The trains differ from hybrid cars in that there is no battery to capture energy when slowing down. Diesel trains cannot draw power from batteries they don't have, however diesel electric trains can draw power from overhead powerlines so they are hybrids.
+yan-Deriction Well, with that thinking that makes my car a hybrid, because it has a gas engine and a hydraulic transmission. But I'm sure that isn't our idea of a what "hybrid" car really is. "Hybrid" can be vague, but most people are just referring to vehicles with two or more forms motive power. In a gas-electric "hybrid", the car can be driven either by the gas engine or the electric motor. In diesel-electric locomotive, power can only come from one way, the diesel driven generator, which is like a normal car, but instead of an electric transmission, it is a hydraulic transmissions with a range of gears.
Spamfried with a hydraulic transmission, your engine is converting chemical energy from fuel into kinetic force to move the hydraulic fluid, which transmits the kinetic force to the wheels. In a locomotive the diesel generator converts chemical energy from fuel into electric energy, which is then converted into kinetic force by the electric motors. the electric motor is its own motor, whereas a hydraulic transmission is not a motor.
While weight can be an issue, there are some things to consider. One, with a straught diesel-electric setup, you won't be carrying a car load of batteries like a straight electric. Two, you can use a smaller horsepower diesel engine than would normally be required..saving weight. Finally, the efficiency usually wins out in the end. Where it would be most beneficial is in higher weight vehicles anyway...the same ones that are massively inefficient in the first place.
A 1.6 diesel with 120 to 130hp plus an electric motor of around 80hp with a range of 60 real km, would be perfect for city and also highways. If you have less than 30km to work, you would use only electric. On long roads it would still consume diesel, but a lot less. A base Tesla Model 3 in Germany costs almost 53k €. The thing is nobody wants to produce a cheap hybrid for the mases, because that would mean a small percent of profit. End of story.
I think is a good idea, cause in town you have a quiet electric car, and when you get up on the highway, you get all the torque of a diesel engines
I have a Peugeot 3008 Hybrid4, which is a diesel hybrid, and I love it... great all round car.
However....a diesel hybrid with a small 3 clylinder diesel could power a powerful electric motor and together you would have awesome torque and towing potential on something with insane fuel efficiency and no lengthy down time charging
Don't forget the E300 diesel hybrid and the C as well. Peugeot also makes them like in the 3008 hybrid4. The diesel powers the front wheels and the electric motors power the back wheels completely separately. So it is 4 wheels drive without a drive shaft.
That's pretty cool in all honesty, whats their MPG like??
Bio fuel diesel electric is the future
Yes. Especially when we have genetically engineered fuel producing algae.
More Cooley!
When do you think EVs without tax credit will make economical sense? The Bolt is about $40k and there are any number of similar sized gas vehicles that would be $10-15k less. Even over 10 years of ownership you won't make that cost differential back. Not to mention battery replacement if you do want to keep one long term 10+ years.
I know they will get there as the keep improving batteries and implementation but are looking at 10 years, 15?
SS S 5 years for price parity with gas with all but the cheapest budget cars and pickup trucks. 8 years for everything else
Check carboncounter.com. It factors in the cost of gas and the price of the vehicle to show when EV version over take conventional engine for savings. You can also factor out tax credits in the customization settings.
Battery replacement hasn't been a real issue in liquid cooled batteries. The batteries are holding up well and should last more than ten years. But in the future, batteries will be cheaper, so it might make sense to upgrade the battery down the line
Take the range of the vehicle, multiply it by 2000, and you'll find the mileage lifespan of the battery pack. Chevy bolt does 230 miles per charge, if it needs a battery replacement after 2000 cycles (pretty typical number of cycles for a high quality battery cell) it will have done 460,000 miles on it's battery pack. *Most* gas and diesel vehicle don't even make it to that mileage before the whole vehicle gets scrapped. Fully electric cars are far cheaper to fuel, and needs a lot less operational maintenance. If you're a guy who buys a new car and sells it every 5 years, EVs are a terrible deal, you will never recoup the cost on fuel and maintenance savings. If you like to buy a car, and run it into the ground over the span of 15 years, a full electric vehicle is probably the best purchase you can make.
Cooley 2020
He would be excellent and fair. World peace
I wonder how many KW you would need to run an electric car? Just have a small diesel generator on board to power the electric motor, AC, and accessories, forget about batteries all together.
Should be 20kw continously and maybe 150kw peak power for acceleration. Small battery or supercapacitor maybe needed to reach peak power.
There must be a political reason why nobody mass produces diesel electrics. Most sensible with at least 50 to 0ver 100mpg!!!!
What about how locomotives work? The down fall for electric vehicles is the battery.. Why not have a plug in diesel hybrid similar to diesel trains but with fewer batteries to save some weight. You run on batteries until your battery level gets to a certain point at which the engine would turn on and act like a generator powering the batteries which then power the electric motors that move the car.
Been wondering about that for years, he's got a point about the cost of manufacture because that is what controls how far R&D gets. Locomotives haul thousands of tons with a relatively small engine, I don't see why they can't do the same thing with cars and tucks!
Because. They want cars to be like home appliances. Change every year or two. Diesel engines are durable. And if they are employed the way you described they will be even more durable and car might run for decades which is bad for business.
@@davekauffman8727 small engine? No most diesel electric locomotives use v12 and v16 diesel engine's with big turbos are superchargers.
Fact:The largest trucks on Earth are diesel hybrids and have been for decades.
Open pit mine "haul trucks" run one or more diesel generators powering AC alternators and usually two AC motors per axel. They are not driven by a conventional ICE drivetrain. These trucks carry 400+ tons at speeds of 40 mph. I think we could throw a low emission 1L 3cyl TD on a PHEV and make it to the store. The global push for full EV regardless of logic is the driving force behind stagnation in innovation for tech like this. Commendable companies like Toyota are taking a stand on the side of reason, vowing to continue their (petrol) hybrid program. There are tradeoffs to all forms of energy allocation for transport.
The Volkswagen XL1 is a diesel hybrid that gets anywhere from 100mpg to 300mpg depending on how you drive.
What's the fuel tank on one of those
also, the gen 4 (current gen) prius engine also has a peak thermal efficiency of 40%
Volvo V60 D6 hybrid awd....also available in D5 form / Peugeot offers a diesel hybrid model...range rover diesel hybrid.....are all available right now in varied markets!!
diesel hybrids would be awesome in terms of pure mpg they can achieve, however part of the prius' beauty is the reliability and ease of maintenance, while diesels are a pain in the ass especially since they need more complicated emissions equipment.
Great question and great explanation. I'm not familiar with diesel engines and didn't know they had similar advantages and drawbacks to EVs
poor explanation. use the diesel to run the generator to power the electric motors. one battery needed to start the diesel, no battery pack necessary(it's the generator!)and the diesel runs at a set rpm where it is most efficient. In this configuration, the faster you go, the better your mpg. we don't need to be so short sighted
Building a diesel hybrid motorcycle would be the dream. You would get the ultimate range (maybe a 1000+ miles of range).
Diesels are even better at running a constant rpm, perfect for generators. A Chevy Volt could run a more efficient diesel at a lower speed compared to the gas engine. The big problem is would people spend the money.
That's the problem because its expensive why not just by a gas vehicle and spend the money slower over the years at a gas pump.
I just want a diesel /electric hybrid so I can make my own power with solar and my own diesel with used plastic.
I am gutted that the air hybrid system has not made it out of R&D. it is a simple system that is cheap and relatively light. not to mention that you could use the pressurised air to boost the engine pressure before turbo is spooled reducing turbo lag
Audi R18 racecar was a diesel hybrid
Another thing to consider is that most gasoline hybrids use Atkinson cycle engines, which, by providing a lower compression ratio for intake vs. exhaust, increase the thermal efficiency to that of a diesel engine. The drawback is that power and torque are significantly reduced, but the electrified hybrid powertrain makes up for the deficiency. So automakers have two engine options, both of which provide the same level of thermal efficiency, but one of which requires complicated and expensive pollution control equipment as the video mentions. Of course you know which one they'll go with.
has anyone tried gas or diesel generator eliminating all the batteries except for the small battery to start the generator??
We have some here in Portugal...
How's about using the engine as a crutch in a serial hybrid config, so your battery is largely replaced by a diesel fuel tank.
Noooo I want a diesel hybrid truck
LeMans Audi used diesel hybrid I assumed
The skoda octavia 1.9tdi does around 65-70mpg if you are not pushing it too much, combine that with a electric motor and you easily reach 80mpg... Dont get it why ppl say its that hard, my ass is that hard, its just not profitable for the companies, thats why its hard to do...
Okay, I can see not have diesel as a "Parallel Hybrid". But as a "Series Hybrid" there would be potential.
Just a thought on diesel hybrid tech. I believe changing how the diesel is used in a hybrid car would go a long way toward sustainability and optimal usage. Instead of two motors driving the vehicle use the electric motor and battery to drive the car. What do diesel engine do very well? Idle. If you were able to effectively idle at a rpm that could recharge the vehicle when needed starting with a plug in hybrid fully charged and use the diesel solely for charging the battery along with regenerative brakes and other tech out there, could you not post a higher mpg? If a semi can idle overnight using 10 gallons of fuel and you were using a 2.0 lt motor to charge charge the battery once underway with overcharge protection automated charging why could it not do much better then the equivalent gasoline hybrid model? Food for thought, answers appreciated.
I disagree, Use a very small diesel engine, to generate power and use the power generated to drive the wheels, and the number of batteries could be a small amount of storage. Just like Diesel-electric trains.
Another way possible... small diesel motor with a CVT transmission between the engine and the generator portion.. so small increased throttle would greatly increase power output available to drive the electric motors on the wheels, of course, an ECU would control the diesel engines rpm and power generation on-demand. I think this is very do-able.
A diesel SERIAL hybrid makes a lot more sense than parallel hybrids.
A diesel hybrid would provide the best city MPG and the best highway MPG. It’s the best of both worlds. Now make a diesel hybrid truck. You would have something super efficient and capable. Payload may suffer a bit at least you can tow efficiently as well.
Foton makes a diesel hybrid full size pickup here in the philippines
heres the thing
biodiesel
it comes directly from crops so its renewable and carbon neutral
Exactly. And depending on your farming practices, the soil used to grow the feedstocks could be used as a carbon sink.
Diesel/Electric hybrids have been around forever... in big vehicles like trains, ships, submarines (technically series-hybrids, which uses electric propulsion, but diesel engines to recharge the batteries) It doesn't make sense in cars for the reasons stated in the video. Btw the Chevy Volt and Fisker Karma are series-hybrids, but gas/electric.
volt is not a pure series hybrid because its able to drive the wheels directly, the fisker karma is the only pure series hybrid
Phrancis5 maybe I'm misinterpreting what a pure series hybrid is but the Chevrolet Volt is able to exclusively Drive the wheels through electric motors and uses a gasoline range extender to add battery power when the charge has been depleted
Not quite true, I believe the bmw i3 with range extender is also a proper series hybrid.
I forgot about the i3, yep. I guess the difference is the i3's range extender is really just a backup generator, whereas a fisker is much more likely to be driven like a hybrid.
Yes, the Volt technically can drive the wheels via ICE at hwy speeds, but it was originally envisioned as a pure series-hybrid, like the Karma, and yes the I3 with generator range extender would be a series hybrid too. Technically the Prius is a combination of series and parallel, but the main point I'm trying to get across is that hybrids really aren't a recent idea because diesel/electrics have been used in large vehicles for some time, but don't really make sense in passenger vehicles. You can read about the general difference in series vs parallel here. www.ucsusa.org/clean-vehicles/electric-vehicles/series-vs-parallel-drivetrains#.WQtZqtIrJhE
Small diesel engine that runs at fixed rpm charging the batteries that actually run the car. Like the double decker buses in London
Do you work for the EPA? Gas engines make peak torque at a higher RPM than diesels.
I am not thinking of a hybrid--when the diesel and the electric power the car--I am thinking of diesel running to generate the electricity to run the electric motors. This would be similar to modern trains.
When it comes to heavy duty trucking I can see diesel hybrids making sense. Hybrids don’t need huge batteries, the truck could run on electricity when idling, when starting from a stop the electric motor could help thus reducing engine wear, on the opposite side brake regeneration from the electric could replace engine braking also less strain on the engine, and start stop technology could save on fuel. Not to mention no need to plug in.
He can't pronounce diesel. 😂 I was thinking of making one myself. ore like 150mpg
Do you pronounced it dee-sell?
I think the extra weight would be great for Regen braking :)
In 2020, Mercedes-Benz is launching a GLE 350 de; you gessed it, a diesel hybrid - 200hp/2 liter / 4 cyl diesel engine + 134 hp electric engine with 31.2 kWh battery pack for a 66 mile electric only range. It's the sweet spot!
You nailed it 99.99%
It makes total sense unfortunately Clean diesel hybrid will be even better. Unfortunately VW messed up the clean diesel technology that is being implemented in many cars and
trucks.
Obviously Cooley is not an engineer. Diesels can be added as a modular, easily detachable system instead of a permanent arrangement. A diesel has not necessarily to have lots of torque.
Using it as an auxiliary system to provide some oomp when needed, and charging the batteries meanwhile, is an idea that has been applied already in the Prius.
It can be designed in such a way that you won't need even a wrench. I know it can be done even in a home workshop.
Follow my channel because in the next few years it's possible I will be working on this.
The heavy/excessive torque argument is only applicable in certain segments. It seems like it would solve many of the issues with an electric truck.
1. Decreased range when towing
2. Inability to haul long distances without extended stops.
3. Excessively large battery
Excellent question, been thinking about that for years. And what a sublime answer! Personally I'm not interested in hybrid, but it was interesting to think about it. Keep up the great work. Cooley 4pres
You are forgetting one very important thing - a Diesel is way better at highway cruise than gas or electric. So it makes sense to have an electric drive when you go about your business in a town or city centre, and then switch over to diesel when you are travelling interstate.
mercedes did a large range of diesel hybrids, some even plugin but as noted VW burned them all with greed and stupidity. There was some great engineering work being done to power the turbo electrically without the power loss of the turbo. However what was the diesel loss was the cost of the exhaust scrubbing and the micro particles that at ultra fine size are near impossible to filter without hobbling the power further. Nothing could solve that. Even shipping is moving from diesel fuel (and thats been ultra low sulphur for some time). We may have seen some benefit from the advanced diesel fuel additives. Diesel as an engine tech is excellent. Its the emissions it generates. Hybrid diesel still means just a more fuel efficient diesel. Ford-GM offer trucks but the heavy engine weight means a diesel is already heavy
why cant you have a diesel engine turn a generator that will drive electric power train, thus removing the batteries completely ?
In China they are using Hybrid diesel vehicles from really long time. Toyota's Heavy Duty company Hino already have mind duty diesel hybrid trucks and mini buses.
Audi Q7 e-tron, its selling well in scandinavia, I would buy it but a bit expensive for me now
What about diesel generated Electric Vehicles. The diesel engine would really only be used for power generation like how pretty much all heavy equipment is setup.
I will love to see diesel having a future in passenger automotive engines. I own a diesel engine powered car . I love every bit of it. The electric motor will be great for off the line performance and straight line.
Seems like the argument against isn’t a good one. Doesn’t seem like a tiny turbo diesel hybrid is any worse an idea than a gasoline hybrid yet it seems to have benefits whose only argument seems to be “cost”. Yet A vw tdi and a vw hybrid are both cheaper than a Tesla.
The Q7 e-tron with diesel ICE is already on sale in Europe.
Agree. I would actually like to see the European version with a petrol engine.
There are diesel hybrid like Volvo v60 d6, Peugeot 3008/508 rxh, audi q7/a7, bmw 730 and Citroen DS5
Hybrids carry significantly smaller batteries than full EV cars. For example my 2013 Ford Fusion Hybrid hides the battery just fine. Its no larger than my trunk, and it could be even smaller.
so Semi Trucks are looking good right for A Hybrid Diesel.
VW just have to ruin everyone's day.
Small diesels were circling the drain anyway. And VW wasn't the only one that got caught cheating, which is why those other manufacturers are being kept from selling diesels.
idontcare80 everybody cheats...even gas engines.
No they don't, they don't need to.
They need to...trust me.
Why would I trust you when they're being tested in the real world and passing those tests?
Being as there are manufacturers marketing the Diesel Hybrid combo successfully, doesn't this disprove your reasons as to why they shouldn't be made?
No problem with low end torque, gearing can sort that.
Explain why they use diesel generators to power electric motors for trains then.
Andrew Van Beek is right about Redundancy issue To dd to his argument diesel is more efficient and quieter at a higher gear ratios since electric motors were always design to do the acceleration because its not very efficient at high speed it would really make sense to use the diesel engine after the 2nd gear it then you get a smoother quiet and a ride
The only why not is: because Petroleum companies dont make enough fucking money. Complete bullshit about torque vs torque.
The guy is talking about a diesel hybrid doesnt have to have fucking batteries. Locomotives dont need batteries, ive got a 2010 hyundai i30 engine that runs in the vehicle about 950kms to 70L of diesel. Thats close to 600 miles for 18.5gal of diesel. Thats not super efficent driving, ie coasting etc etc just a normal long distance drive with aircon etc on.
Now if hyundai can do that, theres no reason why someone cant couple a smaller diesel engine to a genset and develop a pure economical diesel electric vehicle.
Diesel electric locomotives haul tens of thousands of tons of freight using a fraction of the fuel that conventional Diesel only transportation uses per ton, the technology has been around for at least 60 years, it's just unpopular with OPEC because of his much oil revenue would be lost.
Torque is the same on an electric motor across its rpm range.
A smaller diesel engine wont need a turbo ad it's not actually powering the car
A small diesel motor generating power for an electric propelled vehicle is how trains large ships and very large land vehicles have been operating for many many years. The reason why is because it's cleaner more fuel efficient and lasts longer. Now for the consumer-based market of people driving cars they don't exactly want to sell very reliable vehicles, there is a lot of money to be made by selling more and more vehicles and more and more fuel. Unless your electric vehicle is getting its power from nuclear power plants and solar panels then guess where the power is getting generated.. from burning fossil fuels.
You have to think about pick up trucks and towing
On a commercial level it doesn't make sense. On an individual level it absolutely does. Especially using a small tractor engine running on biodiesel.
Why don’t we have Diesel electric cars , not a hybrid I mean I fully electric car with a diesel generator charging the battery’s, like a train or ship. The whole issue with electric engines is that a significant amount of fuel is use just for accelerating so why don’t we have electric vehicles that are powered by internal combustion engines. It’s simply different than a hybrid vehicle that really is more electric assisted than necessarily electric powered.
thanks
Another example is Mercedes Benz E300 bluetec hybrid that reached 61.2 mpg www.greencarreports.com/news/1093005_mercedes-diesel-fuel-economy-european-model-beats-60-mpg
So, about as powerful and green as the Accord hybrid. What's the point?
in certain areas of Europe the emission tax and fuel price for diesel is less than gasoline. so even with the same mpg, cost of having a diesel car may be lower than gasoline car. by the way Honda Accord Hybrid does not give 61 mpg.
Same CO2 emissions, and probably lower NOx emissions. Burning diesel produces more CO2 than burning gasoline. Plus, no DPF to clog and no urea to refill.
I have a Chevy Silverado hybrid with a 300lbs fiberglass truck cap and about 500lbs of tools and depending on my work load 100+lbs of material, so for me the low end torque makes plenty sense and any truck owner who hauls loads would also disagree, a diesel hybrid makes plenty sense, the only thing that matters is more mile to the gallon when it comes to most SUV and truck owners...
I was thinking last time of a naturally aspirated hybrid diesel engine
Do diesel electric submarine or trains make any sense?
You do spread the benefits. That's why railroads run diesel-electric locomotives.
e300 hybrid w212 is a diesel hybrid, with a great range
If that were all true then why the hell do train manufacturers still refuse to use a mechanical drivetrain in a train and use a diesel electric setup it's not a hybrid you just have less losses through an electrical system there by increasing inefficiency
It makes more sense for platforms like pickup trucks or medium duty trucks definitely over an EV counterpart. It's no different than a locomotive.
Diesel electric are more efficient than pure diesel... The problem is the government, which does use no exhaust filter diesel on the road while prohibits the same for regular citizens.
Diesel engines are only efficient if at optimum operating temperature. Diesels take longer to reach this temp and when the engine is only activating when needed in a hybrid the engine will not run at its most efficient on most trips. Also demanding max power from a cold engine is not recommended as this can cause premature damage.
All this said, I’m no engineer so this is only my knowledge and opinion.
The Audi R18 e-tron makes a lot of sense to me...
And diesel electric submarine make a lto of sense too...
Much more advantage the diesel hybrid specially in safety features...
I drive a mk1 Volkswagen Rabbit Diesel car it gets about 40-50 mpg it has a 10 gallons tank, I can run multiple different fuels in my Rabbit, jet fuel/kerosene/used transmission fluid and vegetable oil. I’m putting a 2003 TDI in a mk1 VW Caddy truck it will get 50 to 80 mpg!!
Mercedes also makes diesel hybrids
Locomotives are some of the most efficient machines on the planet, you'd think a manufacturer would make a 3/4 & 1 ton pickup truck that works like a locomotive. emissions and politics are ruining that I guess...
other diesel hybrids : Peugeot 3008 HYbrid4 , Peugeot 508 RXH , ( Citroen )DS 5 Hybrid4