Mazda RX-8 Hydrogène

[auto123.com]

13 octobre 2003
Communiquer de Mazda Média

Mazda RX-8 Hydrogen RE (Prototype)
This technological concept vehicle powered by the Mazda RENESIS hydrogen rotary engine is now undergoing running tests. The hydrogen version of RENESIS is the latest example of the company's efforts to satisfy the demand for both environment-friendliness and exhilarating performance. By making the most of the unique rotary-engine technologies, Mazda was able to develop this powerplant as one proposal for alternative-energy vehicle technologies aimed at a future hydrogen-based society.

In addition to direct hydrogen injection into the intake chambers via two electronically-controlled injectors per rotor, the Mazda RX-8 Hydrogen RE features a dual-fuel system allowing one-touch switching between either hydrogen or gasoline, promoting the car's versatility as a hydrogen fuel infrastructure is developed.

Other environmental-friendly features applied to the vehicle include a plant-based plastic for interior parts and an application of three layer wet paint system. Mazda is also presenting advanced technologies including a hybrid system with electric torque assist and start-stop technology, and a turbocharger with electric motor assistance-technologies that will contribute to future enhancement of hydrogen rotary engine performance.

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[dunlop5120]

Et dire que le premier moteur moderne était conçu pour rouler à l'hydrogène, mais que c'est une cie pétrolière quiavait acheté l'idée et la transformer en un moteur à essence. Question d'argent à 90% et un petit 10% dû au fait que le moteur n'était pas tout à fait à point étant donné que l'hydrogène est une cellule simple et très instable.

Anyway, je crois que ce n'est que la pointe de l'iceberg, mais ça va aller très lentement...question de sécurité, mais surtout de coût. Je ne suis pas certains que les cie automobile affilié au cie pétrolière veulent vraiment qu'on achète plus d'essence....vive le jour au le pétrole va être tout épuisé. Les dernière statistique disent dans 500 ans.....daoh...c'est pas moi qui va voir ça ....quoi que ???

[Le Baron]

Quelqu'un sait si le moteur rotatif offre des avantages par rapport au moteur à piston lorsque vient le temps d'utiliser de l'hydrogène?

[kid]

Bonjour Lebaron,

Tu trouveras en bref un historique concernant les recherches de mazda sur l'hydrogène et les avantages d'un moteur rotatif pour s'adapter à ce type de combustible.

Hydrogen Vehicles

Burning Hydrogen instead of Gasoline. A Hydrogen RE Vehicle with Great Driving Results

Mazda unveiled the initial prototype of its hydrogen car, the HR-X, in 1991. In 1993 it issued the improved version, with greater engine output, known as the HR-X2. The particular features of the hydrogen RE vehicle include the fact that it employs a rotary engine, which by virtue of its construction is extremely suitable for use with hydrogen, and the fact that it incorporates a fuel tank using hydrogen-absorbing metal alloy (metal hydride), which is uniquely configured for the storage of hydrogen as fuel.
Mazda has also performed on-road tests to a total distance of 20,000km since 1995, using an experimental hybrid based on the mass-produced Capella Cargo. These tests have been used to confirm the safety and reliability of Mazda's hydrogen vehicle system. The hydrogen RE car uses an internal combustion engine, meaning that it is impossible to reduce NOx emissions to zero, but it does emit extremely clean exhaust gas. In addition, due to the fact that the vehicle basically burns hydrogen in place of gasoline, Mazda's compound technical experience as a vehicle manufacturer in the production of engines is put to good use.





The Hydrogen Vehicle HR-X2




The Rotary Engine which Increased Hydrogen Power

As hydrogen burns extremely easily, it would be simple for abnormal burning to occur within a reciprocator engine. Since the RE engine is, however, constructed from a low-temperature absorption chamber and a high temperature combustion chamber which are separated from one another, there is no danger of backfiring, in which ignition happens during absorption.
In addition, hydrogen is a gaseous fuel, which takes up a large proportion of the mass of any gas with which it is mixed, meaning that the amount of air that can be absorbed is reduced and output is limited. The HR-X2 employs a system which releases hydrogen after air has been absorbed, which gives improved output. The RE engine takes 1.5 times longer than a reciprocator engine to complete each process, giving plenty of time for the intake of both air and hydrogen.