Maybe it’s just a limitation of my understanding of the laws of thermodynamics and such, but I fail to see how adding a little hydrogen gas to the mix can improve diesel engine fuel economy that much.
It’s not thermodynamics, it’s simple physics. Two forms of matter cannot occupy the same point in space at the same time. By introducing hydrogen gas into the combustion chamber in the right amount, it displaces the droplets of diesel by about 50% with a flammable gas. With half of the normal amount of diesel taking up the same amount of space in the cylinder, fuel mileage is “effectively” doubled as half the amount of diesel is used. The additional horsepower comes from the extremely high combustion rate of the hydrogen. The only problem I see is that there are no liquid hydrogen stations near my house.
Try combining that claim with the energy density of hydrogen at the pressures found during the intake stroke.
No way it contains the same energy as the displaced diesel.