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The Golf TDI Diesel-Electric Hybrid Concept: 69 MPG US

4 March 2008

Golftdihybrid
The Golf TDI Hybrid concept.

The Golf TDI Hybrid concept (earlier post) introduced by Volkswagen at the Geneva Motor Show combines an advanced diesel engine with an electric motor and the latest generation of VW’s seven-speed DSG gearbox. The hybrid concept vehicle is capable of achieving 3.4 L/100km (69 mpg US) of fuel consumption.

At the core of the new Golf TDI Hybrid is a 1.2-liter three-cylinder common rail TDI diesel engine developing 55 kW (74 hp) and 179 Nm (132 lb-ft) of torque. Working either in tandem with the diesel engine or, if required, on its own in all-electric mode, is an electric motor developing 20 kW and 140 Nm (103 lb-ft) of torque. The electric motor also replaces the conventional starter motor and alternator to save weight and improve packaging.

The motor can also operate as a generator, recovering kinetic energy from the car during braking to charge the 220 volt, 45 kg nickel metal hydride battery which has a capacity of 1.4 kWh.

In practice the electric motor powers the vehicle from standstill with the diesel engine only engaging should additional acceleration be required or at higher speeds. In these situations the diesel engine takes over with the electric motor only working if required to supplement the combustion engine – for example, during overtaking manoeuvres. When at a standstill the diesel engine shuts down completely to conserve fuel and increase efficiency. The energy split is relayed to the driver and passengers through a graphic display accessed through the touchscreen satellite navigation screen.

Drive on the concept car is channeled through the new seven-speed DSG twin-clutch gearbox. This features a pair of dry clutches as opposed to wet clutches.

Visual changes which differentiate the Golf TDI Hybrid include a new, unique grille design, smaller front air intakes to reduce aerodynamic drag and ‘TDI-Hybrid’ badging. The Golf TDI Hybrid also sits lower than the standard Golf on revised suspension and adopts the front splitter from the Golf GTI Edition 30 to help further reduce aerodynamic drag.

The Golf TDI Hybrid is currently a concept vehicle, but Volkswagen says that a version of this vehicle is likely to go into production in the future.

This study follows the recent launch of the efficient new Golf BlueMotion. Adopting an optimized 1.9-liter, four-cylinder diesel engine linked to a revised gearbox and more efficient aerodynamics the Golf BlueMotion can achieve a combined 4.5 L/100km (52.3 mpg US) while emitting just 119 g/km of CO2.

March 4, 2008 in Diesel, Hybrids | Permalink | Comments (40) | TrackBack (0)

Comments

Doggydog world, it depends how ubiquitous charging stations are. In the early days, charging at work or at the shops will significantly boost the amount of miles people do on EV.

Eventually they will probably be installed under every parking space and controlled by blutooth using induction charging.

Posted by: clett | March 06, 2008 at 04:03 AM

I would be very interested to know the grams CO2/km with the new 1.2L three cylinder engine, deleting the electric propulsion, and then adding a full stop-start system with extra lead-acid batteries for engine-off A/C function. Would the difference in performance and CO2/km be significant? The cost surely would.

Posted by: JC | March 06, 2008 at 05:51 AM

We've already gone WAY past the point that crude oil alternatives have become viable. In fact, I say within 15 years we'll be getting most of our diesel, heating oil, kerosene and possibly gasoline made from "growing" renewable oil-laden algae on a HUGE scale (using seawater is not an issue here!) and by the early 2020's crude oil will be used primarily as a base for plastics.

Posted by: Raymond | March 06, 2008 at 06:09 AM

Doggydog world, it depends how ubiquitous charging stations are. In the early days, charging at work or at the shops will significantly boost the amount of miles people do on EV.

If you charge twice a day in 10 years you do 7300 full cycles. 3000 is a stretch for most battery chemistries. AltairNano claims 15,000, but it's hard to put much faith in such a flaky company.

Also, a 5 kWh pack is only 3-4 kWh useable, which implies 12-16 mile range. Even recharging twice a day you can't realistically get to 12k miles on that. The other problem is power -- even good chemistries have trouble with 5C rates at 80% DoD. That's only 25 kW with such a small pack, insufficient for even moderate acceleration.

Small packs don't really work for EREV type designs. They can work in "blended" designs which use the ICE for acceleration, high speeds, etc. But such designs only achieve 3-5k EV miles per year under typical use.

Posted by: doggydogworld | March 07, 2008 at 11:27 AM

Ciao

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Posted by: rogeowerY | March 07, 2008 at 05:42 PM

JC, the powertrain that you describe is essentially that of the "3-litre" (per 100 km) version of the VW Lupo of a few years ago, which did not sell well. Same engine, similar gearbox (Lupo had a 5 speed DSG).

The TDI hybrid Golf actually uses a little more fuel (therefore higher CO2) than that Lupo did, but the Golf is a family car of useful size, and Lupo was regarded as too small (and is no longer produced).

Posted by: Brian P | March 08, 2008 at 07:43 AM

Everyone talks about these imaginary charging stations has if they bloom from the trees like blossoms in the springtime. They cost money and someone has to pay for them. Do you expect the city to put them in like parking meters? Has your city committed to doing this? I did not think so.

Posted by: sjc | March 08, 2008 at 08:30 AM

I think everyone is looking at this from a bit of a distorted view.

I happen to believe that, even if this diesel hybrid Golf cost $25,900 base price, it would be worth it (even adding leather and goodies to equal $29,000) when I consider my NEXT vehicle. I currently drive a Honda Element, which I love, but it only averages 22mpg.

Lets say that this Golf Hybrid would be my next choice of car. I would be going from Averaging 22 to say, 62 since I do mostly highway driving. Now, you may think that all the Prius drivers switching to a Golf TDI Hybrid may not be a big deal, but what about folk like me driving 28,000 miles per year? Id say it would be great to get 62mpg even if diesel would go to $4.59gal and gas would be $4.09. I would still slice my dollars spent on fuel from $433/month to $173/month.

That $259 per month buys alot of TDI Hybrid. The TDI hybrid would have to be $14,000 more than a Gasoline Golf equivalent to NOT make financial sense in my world.

Lets give a little more slack to us folk who drive alot more than the typical tree hugger in a years time and stop whining about Prius vs. Golf TDI.

I find the Golf MUCH more visually appealing as well and probably wouldn't consider a Prius, even if it does get 45mpg. avg. The Golf TDI Hybrid gives someone like me a REAL choice in higher-mileage yeild PLUS appeal in one package.

Posted by: Nate H. | March 10, 2008 at 02:25 PM

Yes it costs more to run than the same car with a simpler driveline, but any well developed complex system is going to be more expensive than a generations old simpler system.

I think the point is to reduce fuel use and the reduced emissions, not to be cheaper to run.

Cheap to run is a $1000 diesel Rabbit.

Posted by: Bill W | March 10, 2008 at 03:27 PM

But, cheap to run is supposed to be the goal too, you know.

Americans love cheap. Just look at our procurements from China. We love profits and we love cheap.

Why is this to be excluded on the sole basis of emissions? I dont know anyone whos died from diesel particulates. I do know many folk now dead from smoking cigarettes. Shall we not curb cigarette emissions over auto emissions then?

Is life going to be better with this emission control, throwing away potential fuel savings and cost savings? The middle class will be buying these cars, you know. The paycheck-to-paycheck folk. You speak as if they dont matter, and they will just have to cough up the money and enjoy life less, with less financial freedom, simply because some lofty EPA official thinks C02 is dangerous.

Nate

Posted by: Nate H. | March 13, 2008 at 08:37 PM

Funny how the posts from early march talk about $4 a gallon for regular unleaded as if it might come before the end of the year. 2 weeks later and it is $4.16 a gallon in the midwest....


Sign me up for a diesel hybrid. I love my wifes Jetta TDI and intend to keep it for a long, long time.


Give me an AWD version and I am happy as a clam.

Posted by: Garrett | March 18, 2008 at 11:03 AM

So it's taken VW almost 10 years to get back to MPG the had in 1999! Not through weigh reduction but by adding a heavy battery that is a drag out of the city! Go back to Lupo 3L and A2

Posted by: ecojet | March 18, 2008 at 12:43 PM

Well in the UK it's almost 9.10USD per US Gallon!!!!! Maybe that's why we like 65mpg plus diesel cars!

Posted by: ecojet | March 18, 2008 at 12:45 PM

This is great. Anything over 50 MPG is a huge step forward.

Posted by: Soccer_F1 | March 22, 2008 at 06:56 PM

--just throwing it out there:
can't you get solar panels to charge the electric car?
and isn't it possible to convert diesel to bio-diesel (the old french fry smelling kind)?
So wouldn't that make this the most amazing solution compared to anything else on the market?

Posted by: curiousGeorge | May 31, 2008 at 02:55 PM

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