Patent ID: 7487663
Filing Date: 2009-02-10
Classification: F02B,F02D,G01N,Y02T

Abstract:
1. A method for selecting a fuel formulation from amongst a plurality of fuel formulations, for optimizing the operation of an HCCI engine, comprising the steps of: providing said plurality of fuel formulations including both gasoline fuel formulations and diesel fuel formulations for testing; determining a derived cetane number (DCN) in accordance with ASTM method D6890 as a universal measure of autoignitability for each of said plurality of fuel formulations for use in said HCCI engine, to permit said fuel formulations, to be evaluated on the same scale; testing said plurality of fuel formulations to determine the autoignition properties of each relative to their respective DCN; and matching the fuel ignitability of the tested ones of said plurality of fuel formulations with the compression ratio (CR) of said HCCI engine, to determine the fuel formulation enabling said engine to operate at the highest load and over the broadest load range, at a given CR.