Importance

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Abstract

A split-cycle engine includes a rotatable crankshaft. A compression piston is slidably received within a compression cylinder and operatively connected to the crankshaft such that the compression piston reciprocates through an intake stroke and a compression stroke during a single rotation of the crankshaft. An expansion piston is slidably received within an expansion cylinder and operatively connected to the crankshaft such that the expansion piston reciprocates through an expansion stroke and an exhaust stroke during a single rotation of the crankshaft. A crossover passage interconnects the expansion and compression cylinders. The crossover passage includes a crossover compression valve and a crossover expansion valve defining a pressure chamber therebetween. A pilot crossover valve is disposed between the crossover passage and the expansion cylinder. The pilot crossover valve equalizes fluid pressures acting against the crossover expansion valve in an opening direction, reducing the forces required in actuating the crossover expansion valve.

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First Claim