US 6,279,560 B1Granted

Method of controlling injection of an internal combustion engine as a function of fuel quality

AssigneeC.R.F. Societa Consortile per Azioni

InventorsMarco Mauro, Ugo Bolla, Francesco Pastorelli, Nelson Santamaria, Marco Ciasullo

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Abstract

A method of controlling injection of an engine having an oxygen concentration sensor generating a composition signal correlated to the composition of the exhaust gases, and a number of injectors for injecting fuel for an operating injection time in each operating state of the engine, and each of which is assigned, in each operating state of the engine, a respective calibration injection time determined at an initial engine calibration stage using a reference fuel. In a given operating state of the engine, the control method including the steps of: determining a number of operating values of a control parameter as a function of the composition signal and of a proportional-integral control function; determining an intermediate value of the control parameter as a function of the aforementioned operating values of the control parameter; determining a current correction injection time as a function of the intermediate value of the control parameter, and of a reference value of the control parameter determined at the initial engine calibration stage using the reference fuel and relative to the operating state of the engine; and determining an operating injection time as a function of a calibration injection time relative to the operating state of the engine, of a closed-loop injection time depending on the control parameter, and of the current correction injection time.

Claims22

Dependent claims

A method of controlling injection of an internal combustion engine comprising a number of injectors for injecting fuel for a respective operating injection time (TJO) in each operating state of the engine, and an oxygen concentration sensor generating a composition signal (S) correlated to the oxygen difference in the exhaust gases with respect to a stoichiometric condition;

each of said injectors being assigned, in each operating state of the engine, a respective calibration injection time (TJC) determined at an initial engine calibration stage using a reference fuel;
for a given operating state of said engine, said method comprising the steps of:
a) determining a number (N) of operating values (KP) of a control parameter (KO2) as a function of said composition signal (S) and of a proportional-integral control function;
b) determining an intermediate value (KM) of said control parameter (KO2) as a function of said number (N) of operating values (KP) of the control parameter (KO2);
c) determining a current correction injection time (TJFC) as a function of said intermediate value (KM) of said control parameter (KO2) and of a reference value (KR) of the control parameter (KO2) determined at said initial engine calibration stage using said reference fuel and relative to said operating stage of the engine;
and
d) determining said operating injection time (TJO) for said operating state of the engine as a function of a respective said calibration injection time (TJC);
of a closed-loop injection time (TJS) depending on said composition signal (S);
and of said current correction injection time (TJFC).

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/428,520Filed 28 Oct 1999
Priority: IT TO98A091228 Oct 1998
Granted: 28 Aug 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F02D 41/2454
Characterised by what is learned or calibrated: learning of the air-fuel ratio control
F02D 19/061
To adjust the fuel mass or volume flow: by controlling fuel injectors
F02D 19/0636
Determining a density, viscosity, composition or concentration: by estimation, i.e. without using direct measurements of a corresponding sensor
F02D 19/0649
Characterised by the type of fuels: liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers