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The voices of Chavannes, Tousard d'Olbec, Ramus and other
contemporaries, who foresaw the value of the invention by Isaac de Rivaz
(1752-1828), would diminish without much of an echo if one did not position
properly de Rivaz' role in the history of the internal combustion engine. (Or
more accurately: "spark-ignited engine" - auth.)
To the right is de Rivaz' 1807 'car'. It was propelled by his combustion engine, patented two
years earlier.
The pre-history of the "spark-ignited
engine" starts with Huygens who first has the idea, in 1673, to use the dilation
of gases to force movement such as in a motor. His machine consists of the two
basic components, a cylinder with a piston inside. A gunpowder sash is placed at
the bottom of this pump where, after ignition, the resulting explosion displaces
the air inside the cylinder, forcing it out through a valve. The resulting
vacuum, due to the pressure difference between it and the atmospheric pressure,
forces the piston backward. The transfer of power is proposed by the means of a
pulley system. Abbot Jean Hautefeuille (1647-1724) and Denis Papin (1647-1714),
Huygen's assistant, also conduct experiments to harness the power of explosions.
Others follow the example and experiment with the basic concept of creating a
vacuum via an explosion. Many of these experiments are interesting but they are
somewhat difficult to recognize as the conceptual precursors of genuine
combustion engines.
The "spark-ignited engine" makes its debut in
history roughly in the 1790s. The first names recognized are those of the two
Englishmen who first filed patents on such engines; John Barber on October 31,
1791 and Robert Street on May 7, 1794, although these inventors did not continue
to refine their machines. It is also the case with Frenchman Philippe Lebon
(1769-1804) who obtained his patent on August 25, 1801.
The first construction recognized as an - genuine - engine is due to
the French Claude and Nicephore Niepce whom received their patent on April 3,
1807. This engine, the "Pyreolophore", used the dilation of the air following a
sudden ignition of a fuel mixture in a cylinder with a piston. Simultaneously,
as the Niepce brothers were filing their patent, they were informed of "the inventions of de Rivaz". It is difficult to deduce how they
may have used this information in their subsequent patent filing. Aside from the
essential principle,
which
is to produce a combustion in the interior of a cylinder, the "Pyreolophore"
differs significantly from de Rivaz' engine.
From 1807 on the
projects and the patents for new types of engines multiply. The years until 1860
see more than thirty patents filed, applicable to internal combustion engines
and their components. Some of the better known are those of the English Samuel
Brown (1823 and 1826) and William Barnett (1838), the Italian Eugene Barsanti
(1854) and the French Degrand (1858) and Hugon (1858).
The year
1860 marks a turning point when Etienne Lenoir (1822-1900) builds his
remarkable gas engine. His engine introduces one of those key innovations which
defines subsequent designs, for a long time. (Lenoir's 1-Cylinder engine was
a horizontal arrangement and his 'car' was termed the "Hippomobil" because it
generated it's fuel - hydrogen - via the electrolysis of water. This engine was
later adopted to use various other gases, such as the one derived from coal etc.
This coal-gas burning engine variety is the one which ultimately found
commercial acceptance - auth.)
Lenoir's "Hippomobile". It was a 1-Cylinder, horizontal arrangement, powered by
hydrogen, generated via the electrolysis of water.
Like a couple of
inventors before him, Lenoir seems to be inspired by the fact that the machine
had "natural cycles", during one of which, two of the basic engine functions can
be combined -- A) Uptake of the fresh fuel-mixture; and B) Exhaust of the
combustion vapors. Beau Rochas finds the same cycle in 1862, which bears his
name today. The later came upon his discovery while trying to improve the energy
conversion of the engines and substitutes a liquid fuel mixture instead of coal
gas. Shortly after he conceptualized the four-stroke engine. It is notable that
de
Rivaz had also introduced a "clean cycle" into his engine's operation, half
a century earlier. In 1862 the vehicle powered by Lenoir's engine completes the
18 kilometers between Paris and Joinville just under 3 hours.
Around the same time (1861) the German Otto builds an engine bearing
quite a resemblance to that of de Rivaz' machine. Otto places the cylinder
vertically, with the opening on top. Between the piston and the bottom of the
cylinder there remained a space where a mixture of air and coal gas was
injected. Following ignition, the resulting explosion drives the piston upward
until it reaches the summit of the cylinder. Consequently a vacuum is produced
under the piston and thus, the piston travels down again, pushed by its own
weight and by the atmospheric pressure. The cycle repeats and this movement
actuates a wheel shaft from which a series of cogs ultimately drive a wheel.
This version of Otto's motor is almost identical to the "engine of de Rivaz". It
is only in 1876 when Otto realized another engine, functioning according to the
Beau Rochas cycle. Consequently, "engine spark-ignition" technology had reached
a point of maturity where it could be practically applied to the propulsion of
cars.
In the subsequent years it will be for the efforts of the
French Delamare-Debouteville (1883 and 1884) (Patent No: 160 287,160 288;
Paris; Expired in 1901), whose 2-Cylinder engine design was the first purely
petroleum motor and which later gave rise to the De Dion et Bouton motors, and
especially those of the German Daimler, Benz and Maybach (1883 through 1888)
which bring into service genuine motor vehicles with "spark-ignited engines".