An energy storage and recovery system

Abstract

The invention relates to an energy storage and recovery system (ERS) coupleable to a prime mover and to an energy storage flywheel. The ERS has a hydrostatic arrangement with a first pumping element and a second pumping element. The pumping elements have a respective fluid displacement and a fluid coupling arrangement for the transfer of fluid power between the first and second pumping elements. The ERS also includes a differential device comprising at least three inputs, wherein a first driveshaft of the first pumping element is coupled to a prime mover in use, a first input of the a differential device is coupled to said prime mover in use, a second input of the differential device is coupled to a second driveshaft of the second pumping element, and the third input of the differential device is coupled to a flywheel in use.

Dependencies are inferred from the claim text.