On another note...
If you could make hydrogen using the electricity from a free source (WVO genset, windmill, solar, regen braking, ect) then in might save you some fuel.
Most electolosis hydrogen generators I've seen, on the internet, on cars, pump the hydrogen right into the intake. They make very small quantities and the fuel injection system compensates accordingly as a normal funciton of contolling rich/lean by O2 sensor readings.
Wouldn't be so great on a diesel, because of the higher compression, the hydrogen would probably preignite as the piston came up. Having combustion too far before TDC is bad on any engine.
Up on the podium, liking to hear myself talk!
By the way this is a basic premise of Diesel engines. Ok lets say we got a gas engine and we want more power or effeciency. We raise compression from the 9 to 1 (ie passenger car) or 11 to 1 (ie sports car) to about 22 to 1 (diesel). Right away we see EGT temps skyrocket and we start melting pistons because the fuel reaches combustion temp, due to the high compression, before the piston reaches TDC. The fuel charge ignites and combustion pressures explodes as the piston is still moving up trying to compress these exploding gases. Pre-ignition is very hard on pistons, rods, bearings valves, head gaskets, head bolts ect. So in order to keep the pre-ignition from happening, with a high compression engine, we simply inject the fuel at (or slightly before, see note below) TDC. Now or combustion is simply working to push the piston down.
Want the best of both worlds? How about Direct injected gas motor? They're allready in production in the chevy Cobalt (IIRC) and probably others. Problems in design till now have been its hard to inject fuel into high compression. "Normal" gas engines inject fuel into intake area that is either at atmospheric pressure or in a vacuum. Diesel engines have powerful injection pumps, with massive injection pressure to overcome their high compression. You cant pump gas in a diesel injection pump because the gas doesn't lubricate as it is pumped (diesel does). They basically overcame this on powerstroke diesel by using High pressure oil pressure (from a secondary oil pump) to assist the injector. Now current clean diesels needed even more control so they are using "piezo" (just like the piezo electric buzzer) injectors that can be controlled electronically but still can handle enough pressure to inject into a compression ignition engine.
Note below. (from above)
Fuel is injected before TDC because it takes time for the fuel to get into the cylinder and it takes time for the combustion to happen. As the rpms increase the engine is spinning faster so this "lag" requires the fuel to be injected earlier (or on a gas engine the spark needs to happen earlier). On our diesels the "timing" is controlled inside the Injection Pump mostly by rpm. Higher rpm = earlier timing.
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