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The purpose of this paper is to describe a novel liquid fuel conditioning process that is incorporated within a 4-stroke internal combustion engine. The process takes place inside a small external vaporization chamber linked to the engine cylinder. A vaporization chamber transfer port is located adjacent to the cylinder bottom dead center. After an injected primary liquid fuel has evaporated and superheated inside the vaporization chamber it is transferred into the cylinder near the end of the intake stroke to form a homogenous mixture with a fresh air charge. Combustion is triggered by compression-ignition of a pilot fuel spray. Near the end of the expansion stroke, hot combustion products enter the vaporization chamber via the vaporization chamber transfer port. Thereafter, those products are entrapped inside the vaporization chamber during about 320° of crankshaft rotation since the vaporization chamber transfer port is sealed by the piston skirt for part of the cycle.

The purpose of this paper is to describe a novel liquid fuel conditioning process incorporated within a 2-stroke internal combustion engine. The process takes place inside a small vaporization chamber integrated within the engine piston. The vaporization chamber inlet/outlet is located on the piston skirt. After an injected liquid fuel has evaporated and superheated inside the vaporization chamber, it is transferred into the cylinder to form a homogenous mixture with a fresh air charge. Combustion is triggered by compression-ignition of a pilot fuel spray. After combustion completion, hot combustion products enter the vaporization chamber via a transfer port formed in the cylinder wall. Thereafter, those products are entrapped inside the vaporization chamber with the inlet/outlet aperture sealed by the cylinder wall for a portion of the cycle.

The purpose of this paper is to describe a novel liquid fuel conditioning process that is incorporated within a Wankel type rotary engine. The process takes place inside three small vaporization chambers attached to the engine rotor. After an injected liquid fuel has evaporated and superheated inside a vaporization chamber, it is transferred via a transfer port into a moving chamber near the middle of a compression phase to form a stratified mixture with a prevailing fresh air charge. Combustion is triggered by a spark. Near the end of an expansion phase hot combustion products enter the vaporization chamber via an entrapment port. Thereafter, those products are entrapped inside the vaporization chamber during about 180° of rotor rotation. Unlike spark ignition, compression ignition or homogeneous charge compression ignition engines, here the liquid fuel is injected into the vaporization chamber during the exhaust phase of a preceding cycle.