A Tree Falling in the Forest

Time out for science...

I remember seeing a video in high school about innovative ideas and conventional wisdom. The narrator/host demonstrated a 3 wheeled vehicle that used hydraulic motors for propulsion. The advantage, he said, was that energy could be captured from braking in the form of hydraulic pressure and the small engine used to build additional pressure could run at its most efficient rpm range to power the vehicle. He even demonstrated that it could be driven with the engine turned off. He also went on to state that the technology would be unlikely to take hold because consumers prefer the familiar (ie. traditional engine transmission configurations).

This obviously made an impression on me and I have since wondered if the technology could be utilized to make more efficient vehicles. I think that was about 1989, which means the video was probably made in 1982.

Fast forward to today... "Through the use of innovative hydraulic hybrid technology EPA and its industry partners have been able to create the most efficient and cost-effective powertrain technology in the world." "Hydraulic Hybrid Vehicles (HHVs) rely on proven innovative technology which can be applied to light duty work trucks, SUVs and heavy duty urban vehicles such as city transit buses and garbage trucks." "There are three key design features enabling an HHV to provide maximum fuel efficiency: Regenerative Braking. Optimum Engine Control. Shutting Engine Off When Not Needed." This EPA brochure explains how the Hydraulic Hybrid Works.