Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1996-09-30
1998-04-07
Nelli, Raymond A.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
123406, F02B 1300
Patent
active
057352534
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to control systems for internal combustion engine of the type comprising a gasoline feeding system including a plurality of gasoline injectors associated to the various cylinders of the engine and an electronic control unit for controlling the injectors on the basis of signals representative of the engine operating parameters, and for controlling ignition in the various cylinders of the engine on the basis of signals representative of the angular position of the engine shaft.
In recent years, the increasingly strict limitations imposed by the various laws to noxious emissions of internal combustion engines have determined a new interest by manufacturers towards engines using gas, particularly methane or LPG (Liquefied Petrol Gas) as a fuel.
According to the conventional technique, methane or LPG engines are provided with a choke device for motoring the fuel to be mixed with the air fed to the engine, according to an arrangement similar to that of a conventional carburator of a gasoline engine. This solution however is no longer acceptable since it is not adapted to operate in conjunction with an electronic system for controlling the operation of the engine which is able particularly of controlling the motoring as a function of the composition of the exhaust gasses sensed by means of a lambda sensor.
Therefore it has become advantageous to have methane or LPG engines provided with a fuel injection system.
A further problem lies in the need of adapting a gasoline injection engine so that it can use methane as a fuel. It is still to be noted that because of the gaseous state of the methane, the volumes involved are as an average ten times greater than those of a gasoline injection system. This means that an injector device designed for the injection of methane has a much greater size than a gasoline injector device. As a result of this, the structure of a gasoline injection engine cannot be used directly for the injection of methane.
In its previous Italian patent application No. TO94A000343, filed on 29 Apr. 1994, which is still secret at the filing date of the present patent application, the Applicant has already proposed a system which can be used to transform an engine which was originally able to operate only with gasoline injection, into an engine able to operate either with gasoline or with methane injection. In this system, each cylinder of the engine is provided both with a gasoline injector and with a methane injector.
SUMMARY OF THE INVENTION
The object of the present invention is that of further improving the solution previously proposed by the applicant, with specific reference to the system for controlling the operation of the engine, extending its application also to the injection of LPG.
In order to achieve this object, the invention provides a control system for internal combustion engine comprising a gasoline feeding system including a plurality of gasoline injectors associated to the various cylinders of the engine and an electronic control unit for controlling the injectors on the basis of signals representative of the engine operating parameters, and for controlling the ignition of various cylinders of the engine on the basis of signals representative of the angular position of the engine shaft,
characterized in that said system further comprises a plurality of methane or LPG injectors, associated to the various cylinders of the engine and an auxiliary electronic control unit, comprising
means for selecting a mode of operation of the engine among a mode only with gasoline feed, a mode only with methane or LPG feed and a mode with mixed feed,
means for controlling said methane or LPG injectors on the basis of signals representative of the engine operating parameters, and
means for modifying said signals representative of the angular position of the engine shaft which are sent to the main control unit, so that the ignition is adapted to the operation with methane or LPG feed.
Due to said features, the control system according to
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patent: 5555873 (1996-09-01), Nolen
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Boni Roberto
Bortignon Giorgio
Perotto Aldo
C.R.F. Societa Consortile per Azioni
Nelli Raymond A.
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