Hydraulic hybrid powertrains have been investigated by a number of system development companies, the U.S. military and is finally entering commercial production. Most notably Parker Hannifin and Eaton Corp. have been developing such systems primarily for use with heavy-duty truck system. While these two "heavyweights" are now taking orders, they are not the only firms developing systems. NRG Dynamix and Hydraulic Hybrid Systems, LLC have also developed systems that can be fitted to a wider range of smaller work trucks and a sports car. Common to all of these company's systems are composite accumulators, most of these are based on commercially available 5,000 psi Type III and Type IV pressure vessels -primarily supplied by Lincoln Composites and Structural Composites Industries (SCI). The results from using the hydraulic hybrid technology are impressive. Fuel efficiency is typically increased between 30% and 70% (depending on the type of driving performed) -potentially saving vehicle operators thousands of dollars per year in reduced fuel expenditures, break wear and engine maintenance.
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