Patent ID: 11952936
Assignee: CLEARFLAME ENGINES, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 10:
11. A method of operating a compression ignition engine during a cold-start time period, the compression ignition engine including an engine cylinder having an inner surface, a head surface, a piston disposed and configured to move in the engine cylinder, an intake valve, and an exhaust valve, the inner surface of the engine cylinder, the piston, the head surface, the intake valve, and the exhaust valve defining a single combustion chamber, the compression ignition engine including an ignition-assist device, the method comprising the steps of:
opening the intake valve during the cold-start time period to draw a volume of air into the combustion chamber, the cold-start time period designated as a time period in which the volume of air has a mass-average temperature of less than about 50° C. at the moment the volume of air passes through the intake valve;
moving the piston from a bottom-dead-center (BDC) position to a top-dead-center (TDC) position in the combustion chamber at a compression ratio of between about 15 and about 25;
injecting a volume of a fuel into the combustion chamber, the fuel including an alcohol fuel, the volume of the fuel and the volume of air forming an air-fuel mix;
closing the intake valve; and
using the ignition-assist device to combust the volume of the fuel, the totality of the volume of the fuel having a cetane number of less than about 20.