KPIT Cummins & Bharat Forge Launch REVOLO Hybrid Car Kit
For trucks. Mechanical linkage.
http://innovation.hindustantimes.com...er-cheaper.php
For cars... this is the pulley kit.
Revolo - Wikipedia, the free encyclopedia
I heard about the system last year when it was announced. So far, they have yet to commercialize it, though test units have been seen in India.
The worry is whether the fuel savings down the line will pay for the kit. Obviously, having the electric motor that far removed from the wheels and only acting through the crank pulley means that it won't be able to drive on electric power alone, and the efficiency at transmitting and generating power in assist/regen mode will be compromised by the pulley system itself... but I'm hopeful that this kit will eventually go commercial.