Novel 4-Stroke Piston Engine ACENT Laboratories

Format:

Conference/Event

Author/Creator:

Trucco, Trucco, author.

Conference Name:

21st SAE Brasil International Congress and Exhibition (2012-10-02 : Sao Paulo, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

The purpose of this paper is to describe a novel liquid fuelconditioning process that is incorporated within a 4-strokeinternal combustion engine. The process takes place inside a smallexternal vaporization chamber linked to the engine cylinder. Avaporization chamber transfer port is located adjacent to thecylinder bottom dead center. After an injected primary liquid fuelhas evaporated and superheated inside the vaporization chamber itis transferred into the cylinder near the end of the intake stroketo form a homogenous mixture with a fresh air charge. Combustion istriggered by compression-ignition of a pilot fuel spray. Near theend of the expansion stroke, hot combustion products enter thevaporization chamber via the vaporization chamber transfer portraitThereafter, those products are entrapped inside the vaporizationchamber during about 320° of crankshaft rotation since thevaporization chamber transfer port is sealed by the piston skirtfor part of the cycle.Unlike spark ignition, compression ignition or homogeneouscharge compression ignition engines, here the liquid fuel isinjected into the vaporization chamber during the expansion stroke.Fuel droplets absorb heat from the hot entrapped combustionproducts and vaporization chamber walls, where they evaporate andreach a superheated gaseous state. Calculations predict that theresidence time available inside a typical vaporization chamber ofan engine running at 6,000 RPM is sufficient to evaporate andsuperheat gasoline fuel droplets of 180 micron SMD.It is anticipated that this novel concept could substantiallyreduce the untreated emission levels of nitrogen oxides, carbonmonoxide, particulate matter and unburned hydrocarbons whencompared to spark ignition, compression ignition or homogeneouscharge compression ignition engines. This projection implies thatless costly and simpler aftertreatment devices will suffice tocomply with emission standard regulations. An improvement in enginefuel economy is expected because: (1) relatively high designcompression ratio, (2) un-throttled operation and (3) faster heatrelease rate than that corresponding to either spark ignition orcompression ignition engines.The combustion process prevents detonation and diesel knockingtherefore the fuel does not need to be rated for octane or cetanenumber. These features allow this engine to efficiently employgasoline or diesel fuels without additives or blends. Additionally,the system is expected to effectively utilize low-costpetroleum-derived fuel, biodiesel, bio-alcohol, vegetable oil, andin special applications coal-water-slurry fuels

Notes:

Vendor supplied data

Publisher Number:

2012-36-0123

Access Restriction:

Restricted for use by site license