Has any of the GM engineers considered compressed air technology to be used in vehicles?
Imagine the possibilities. Somebody in Europe is trying it. They will definitely need our great engineers at GM to help out!

I've recommended that GM investigate the rotary air engine for use as a range extender in their flex-drive configurations:

http://www.engineair.com.au/index.htm

That sounds fascinating, however, I don't understand where this motor gets its energy from? Is it compressed air?

can the engine be reversed to compress the air as well? what is the storage capacity in terms of energy? Is this for short term storage or long term storage?

That sounds fascinating, however, I don't understand where this motor gets its energy from? Is it compressed air?

Yes, there would be a high pressure air tank on board, just as there is a gasoline tank for a gasoline range extender.

can the engine be reversed to compress the air as well? what is the storage capacity in terms of energy?

Wow, that's a great question. Looking at the design, I doubt it, or if it does, it isn't the most efficient approach for compression.


Is this for short term storage or long term storage?

The compressed air is stored until you need it, just as gasoline is stored until you need to run a gasoline ICE range extender. Compressed air isn't as efficient as batteries, but it is much cheaper to implement, and zero emissions, assuming compressor is powered by clean energy.

I agree this alternative looks very promising for small cars although you lose the regen of electric you make up for it with simplicity. Carbon fiber 5000 psi 88 cu. ft. tanks are now available for $600. There are ones in development for over 10k psi. Recharge at gas stations is doable in 3 min. and even home compressors are doable but expensive $5k.

Also distribution of liquid air to gas stations to recharge their central compressed air tanks would simplify the infrastructure and cost for gas station owners.

The current Tata air car http://www.theaircar.com/acf/index.html if very light and small and would not be suitable for the American market but a scale up might be as advantageous. If they get their's off the ground we will see but overall it looks very promising to me.

Air Cars could have supercaps or batteries on board as part of a regenerative braking system, to make them even more efficient.

I still think the rotary air engine is a better power plant.