US 6,279,559 B1Granted

Control method for controlling injection of an internal combustion engine as a function of fuel quality

AssigneeC.R.F. Soiteà Consortile per Azioni

InventorsMarco Mauro, Stefano Ciuti, Enrico Fornatto, Alessandro Volpin, Claudio Zanet

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Abstract

A control method for controlling injection of an engine having an oxygen concentration sensor generating a composition signal as a function of the oxygen difference in the exhaust gases with respect to the stoichiometric condition of the burnt air/fuel mixture, 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 an intermediate injection time as a function of a number of operating injection times of the injectors; calculating a current correction coefficient as a function of the intermediate injection time and of a reference injection time determined at the initial engine calibration stage using the reference fuel; and determining an operating injection time as a function of the calibration injection time relative to the operating state of the engine, of a closed-loop injection time depending on the composition signal, and of the current correction coefficient.

Claims24

Dependent claims

A control method for controlling injection of an internal combustion engine (1) comprising a number of injectors (12) for injecting fuel for a respective operating injection time (TJO) in each operating state of the engine (1), and an oxygen concentration sensor (10) generating a composition signal (S) correlated to the oxygen difference in the exhaust gases with respect to a stoichiometric condition;

each of said injectors (12) being assigned, in each operating state of the engine (1), a respective calibration injection time (TJC) determined at an initial engine calibration stage using a reference fuel;
for a given operating state of the engine (1), said method being characterized by comprising the steps of:
a) determining an intermediate injection time (TJM) as a function of a number (N) of operating injection times (TJO) of said injectors (12);
b) calculating a current correction coefficient (KCN) as a function of said intermediate injection time (TJM) and of a reference injection time (TJR) determined at said initial engine calibration stage using said reference fuel;
and
c) for said operating state of the engine (1), determining a said operating injection time (TJO) 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 coefficient (KCN).

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/428,519Filed 28 Oct 1999
Priority: IT TO98A091328 Oct 1998
Granted: 28 Aug 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 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 41/0025
Electrical control of supply of combustible mixture or its constituents: controlling engines characterised by use of non-liquid fuels, pluralities…