100th Anniversary of First US Hybrid Car Patent

March 2 is the 100th anniversary of the granting of the first US patent for what was called the “Mixed Drive for Autovehicles.” of Henri Pieper’s 1905 Hybrid Vehicle Patent Application. Henri Pieper, a German-born inventor and gunmaker in Belgium, submitted his application on November 23, 1905—and was granted a US patent on March 2, 1909.

M. Pieper was not the first engineer to create a hybrid car. In 1898, the 23-year-old Ferdinand Porsche built his first car, the Lohner Electric Chaise—the world’s first front-wheel-drive vehicle. Porsche’s second car design was a series hybrid (like the Chevrolet Volt, due out in 2010) in which a combustion engine ran a generator that powered electric motors in the wheel hubs. Its battery could take Porsche’s hybrid car nearly 40 miles—the same as promised by the Volt. Plus.

Pieper applied for his patent a year or two after Porsche built his hybrid. The patent describes processes that are now well known to hybrid engineers and mechanics—including the parallel-hybrid design, and electric assistance for the engine under load.

Unlike today’s hybrids, the driver of Pieper’s vehicle changed modes using a hand lever. Drivers also controlled a magnetic-disc clutch that connected the engine to a DC motor-generator, or dynamo, which in turn was connected to a gear-set that turned the rear wheels via chain drive.

The driver’s hand lever moved through positions that operated a series of mechanical switches and relays. Mode One used the dynamo as a starter motor to fire the engine, which normally powered the vehicle alone. Another mode used road motion to charge the battery—what we would call “regenerative braking.” A further mode sent battery power to the dynamo to supplement engine torque. And a last mode spun the dynamo backward, providing an electric reverse gear.

In every case, the engine’s fuel-air mixture and spark timing were controlled automatically based on the lever position. In addition, the driver could disengage the clutch, shunting all engine power from the final drive to the dynamo, to charge the batteries.

But while Henri Pieper may have been a brilliant inventor, his timing was horrible. The year before his patent was granted, Henry Ford built the first assembly lines in Detroit to produce the Ford Model T—the first affordable, mass-production car. It would cement the primacy of the gasoline engine to power road vehicles.

The rest, as they say, is history. Steam and electric cars gradually faded from view, and by the 1930s, production of hybrid and electric vehicles—a few based on Pieper’s patent—had screeched to a halt.

One hundred years and a gazillion gallons of gasoline later, the hybrid gas-electric car has reemerged as an effective and feasible alternative to gas-only internal combustion vehicles. More than 1.5 million hybrid cars can now be found on roads around the world.

– from hybridcars

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