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Title: Method of estimating the fuel/air ratio of an internal combustion engine

Abstract

This patent describes a method of estimating the ratio of the air and fuel mixture supplied to a cylinder of an internal combustion engine through an intake valve that is closed upon completion of the intake phase of the cylinder to trap an air-fuel charge in the cylinder at a predetermined crank angle during rotation of an output crankshaft of the engine, the intake phase being followed by a compression phase and a combustion phase as the engine crank angle increases, the method comprising the steps of: (a) determining the trapped charge mass m in the cylinder; (b) setting an initial estimated fuel/air ratio value; (c) for the estimated fuel/air ratio, determining the gas pressure in the cylinder and the engine crank angle corresponding thereto at which the mass fraction burned ..mu../sub b/ during combustion represents substantially complete combustion; (d) determining the mass burned m'/sub f/ based on the pressure and crank angle at which the mass fraction burned ..mu../sub b/ during combustion represented substantially complete combustion; (e) computing the total fuel mass burned m/sub f/ during combustion.

Inventors:
Publication Date:
OSTI Identifier:
6423066
Patent Number(s):
US 4788854
Assignee:
General Motors Corp., Detroit, MI
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 7 Dec 1987
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; FUEL SYSTEMS; COMPUTER CALCULATIONS; INTERNAL COMBUSTION ENGINES; FUEL-AIR RATIO; METERING; OPERATION; VALVES; CONTROL EQUIPMENT; ENGINES; EQUIPMENT; FLOW REGULATORS; HEAT ENGINES; 330100* - Internal Combustion Engines; 990220 - Computers, Computerized Models, & Computer Programs- (1987-1989)

Citation Formats

Javaherian, H. Method of estimating the fuel/air ratio of an internal combustion engine. United States: N. p., 1988. Web.
Javaherian, H. Method of estimating the fuel/air ratio of an internal combustion engine. United States.
Javaherian, H. Tue . "Method of estimating the fuel/air ratio of an internal combustion engine". United States.
@article{osti_6423066,
title = {Method of estimating the fuel/air ratio of an internal combustion engine},
author = {Javaherian, H},
abstractNote = {This patent describes a method of estimating the ratio of the air and fuel mixture supplied to a cylinder of an internal combustion engine through an intake valve that is closed upon completion of the intake phase of the cylinder to trap an air-fuel charge in the cylinder at a predetermined crank angle during rotation of an output crankshaft of the engine, the intake phase being followed by a compression phase and a combustion phase as the engine crank angle increases, the method comprising the steps of: (a) determining the trapped charge mass m in the cylinder; (b) setting an initial estimated fuel/air ratio value; (c) for the estimated fuel/air ratio, determining the gas pressure in the cylinder and the engine crank angle corresponding thereto at which the mass fraction burned ..mu../sub b/ during combustion represents substantially complete combustion; (d) determining the mass burned m'/sub f/ based on the pressure and crank angle at which the mass fraction burned ..mu../sub b/ during combustion represented substantially complete combustion; (e) computing the total fuel mass burned m/sub f/ during combustion.},
doi = {},
url = {https://www.osti.gov/biblio/6423066}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {12}
}