Patent ID: 8286598

Claim:
A method of boosting intake air pressure above 1.7 bar absolute in a split-cycle engine without knocking, the method comprising: providing a split-cycle engine having a crankshaft rotatable about a crankshaft axis of the engine, a compression piston 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 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, and a crossover passage interconnecting the compression and expansion cylinders, the crossover passage including a crossover compression (XovrC) valve and a crossover expansion (XovrE) valve defining a pressure chamber therebetween; boosting intake pressure of a charge of air into the compression cylinder during the intake stroke to at least 1.7 bar absolute; compressing the charge of air during the compression stroke; opening the XovrC valve to transfer the charge of air into the crossover passage; and injecting fuel into the crossover passage entirely during the compression stroke.