Mazda has pursued a different route of combining
hydrogen and combustion engines over the last 20 years
presenting their first hydrogen rotary engine vehicle
prototype, called Mazda HR-X in 1991 [28]. A rotary
engine, originally designed and developed by Dr. Felix
Wankel, and thus sometimes called a Wankel engine,
differs from a reciprocating engine. It uses a triangular
rotor that moves on eccentrics in a specifically designed
housing instead of using a piston and crank mechanism.
Because of the rotor and housing design, and the eccentric
motion, the four strokes known from a reciprocating
engine (see Fig. 1) occur in separate areas. While it takes a
reciprocating four-stroke engine two engine revolutions to
Mazda has pursued a different route of combininghydrogen and combustion engines over the last 20 yearspresenting their first hydrogen rotary engine vehicleprototype, called Mazda HR-X in 1991 [28]. A rotaryengine, originally designed and developed by Dr. FelixWankel, and thus sometimes called a Wankel engine,differs from a reciprocating engine. It uses a triangularrotor that moves on eccentrics in a specifically designedhousing instead of using a piston and crank mechanism.Because of the rotor and housing design, and the eccentricmotion, the four strokes known from a reciprocatingengine (see Fig. 1) occur in separate areas. While it takes areciprocating four-stroke engine two engine revolutions to
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