After eighteen months in review by the United States Patent and Trademark Office, documents published on October 24, 2017, reveal GM has been granted a patent for an internal combustion engine with elevated compression ratio and multi-stage boosting.
The document describes a propulsion system made up of a high compression internal combustion engine which uses a low-flow supercharger in combination with a high-flow turbocharger, linked to “one or more electric motor/generators, none of which are shown”.
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