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Citroën to Show Diesel Mild Hybrid Concept Cabriolet

C5 Airscape diesel mild hybrid.

Citroën will unveil a diesel mild hybrid concept Cabriolet—the C5 Airscape—at the upcoming Frankfurt Motor Show in September.

The concept vehicle sports a 2.7-liter V6 HDi engine with 6-speed automatic transmission, the UrbanHybrid mild hybrid system, and an innovative Snow Motion traction control system for a performance close to that of a four-wheel drive.

The UrbanHybrid system is a start-stop system that uses supercapacitors for energy storage. (Earlier post.)

In Drive mode, when this concept vehicle is travelling at under 6 kph (3.7 mph) and the driver’s foot is on the brake pedal, the engine cuts out. It starts again instantly and automatically as soon as the driver releases the brake pedal.

The onboard network (air conditioning, radio etc.) is powered by energy recovered during the deceleration and braking phases. The system will provide a temporary boost to engine torque, when overtaking for example.


Rafael Seidl

On this small scale, hybridization may be affordable in diesel cars. Remember, it's not about maybe one day producing 10,000 super-duper-efficient cars a la automotive X prize. It's about actually selling hundreds of thousands of cars right now, with each a little more frugal than its predecessor.

Citroen PSA introduced Valeo's stop-start microhybrid system in their diesels a few years ago. This next iteration featuring supercaps takes the concept one incremental step further. I would not be surprised to actually see it in a future C4/C5/C6 before the EU's fleet average CO2 regulation goes into force (currently planned for MY 2012).


And it looks good too!!

Bring it on!!

Wait, I live in the states, trucks for me!!


It is nice to see your positive comments about a mild (some say micro) hybrid, when for years GM has been bad-mouthed on these very pages for its efforts on the Silverado/Sierra, Vue, Aura, and Malibu. Why, when it is a European OEM, are the comments so positive? Just something I wonder about. Perhaps I, being a [dumb, stupid, energy-hungry truck driver, ugly, pick your pejorative] American, am too sensitive?


Mild diesel hybrid may make sense on a new generation, efficient. light weight car to push it from 50 mpg to 60+ mpg but it is a none event on 2 + tonne gas guzzler monsters. Who cares if your monsters can do 12.5 mpg instead of 10 mpg.

That is the real difference

joe blow

To the above poster: 50 -> 60mpg isnt likely. Maybe more like 50->55mpg for a mild hybrid.

Also, the difference between 10mpg and 13mpg for "average" drivers is much more impactful than the difference between 50 and 60 mpg. Lower MPG vehicles suck much more fuel per mile, and if an "average" driver puts say 12000mi/year, that's a lot more fuel saved.

I think the real interest in these vehicles isnt American vs Euro, it's diesel hybridization in light duty vehicles. Heavy duty consumer-oriented diesels arent so interesting, and yes, people figure that at 10mpg, theyre not the best approach for saving fuel for the masses anyway (i.e. few people really "need" large, heavy duty 10mpg vehicles).

Joe blow,

I spent some times around Alberta lately and the 10 mpg very large vehicles were very common place. Without counting all of them, a rough estimate would be between 40% and 50%.

PS: Most of those huge vehicles were driving around with only one person (the driver) and NO OTHER VISIBLE LOAD. A gas station attendant estimated that they consume over two third of the gas sold at his station.

This may have something to do with the support of the local Tar Sands industry?

I was told that the situation is very similar just south of the border (without Tar Sands)?


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