Although, I think EV vehicles (= electrical engines) and fuel cell technology will eventually eliminate the need for any thermodynamic engines there is a niche for hybrid systems.
Conventional internal combustion engine (including diesel) don't use all the possible range. The
LiquidPiston managed to get some progress:
http://www.gizmag.com/liquidpistol-rotary/24623/
Scuderi mentioned as main improvement in his Engine: shift the fire time from top dead position and essentially pressuring up the fuel mixture.
http://en.wikipedia.org/wiki/Scuderi_engine
In my hypothesis there is a chance to achieve even more. Here it is:
The cylinder is much longer to make use of the volume (extend the use of the right tail = low left energy; and more pressuring mixture for up to to diesel level). On the right site there is a solar gear connected to electric motor with super capacitors. With or without Electric plugs - depends on the final pressure.
It is basically the same 4 cycle engine directly connected to electric motor. One cylinder to one electric motor (however possible to find some 2 to 1 or other variations). There is no need for usual chain synchronization - one cylinder is all we need.
How it works
Fire Strike - The solar gear with electrically adjusted motion (like injectors controlled by computer) transfer energy to electric motor which quickly charge the super capacitor. Gear ratio could be optimized maximizing the energy taken from volume expansion cycle.
Fumes Out - When the energy is taken away than magnets switched back to push the piston back. The off valve opens to get rid of the fumes - Electric motor will take some energy from capacitor to move the piston in.
Fuel in - as conventional vacuum or some external turbine. The same saved energy used to move the piston. The point is that electrical motor have efficiency of up to 98% with capacitor losing more to may be 90% which is still more than mechanical system.
Compression - the main energy consumer phase. Again solar gear plus capacitors with computer optimized timing I believe will make it better than neighbor cylinder.
Long size = surface could be useful not only for pressurizing but for air cooling with bigger radiators probably eliminating the water cooling system.
If works the system should be much simpler and eventually much cheaper.
Computer controlled piston movement closed the dead zone issue.
The excess electricity goes to electric motors to drive... or charge the house...
To remind how the solar gears work
Power Split Device Epicyclic gearing
http://auto.howstuffworks.com/hybrid-car7.htm
http://eahart.com/prius/psd/Addition:
Instead of the sun gear the adopted Magnomatics motors could be used
http://www.youtube.com/watch?v=PyBTE5cjGDY
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