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On-off valve for a gas injection system, particularly of methane, for internal combustion engines

a gas injection system and gas injection technology, applied in the direction of fuel injection pumps, machines/engines, liquid fuel feeders, etc., can solve the problems of tightness and the inconvenient use of plastic material valve members, and achieve good tightness quality

Inactive Publication Date: 2010-04-27
METATRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The object of the invention is to realise an on-off valve of the perfected type for use in gas injection systems of the type described above, which guarantees good tightness quality in all conditions of operation and particularly at all operating temperatures.
[0012]The use of the metal-to-metal contact of the valve according to the invention ensures a fixed geometry of the valve in all operative conditions and, particularly, and at any operating temperature and pressure value.

Problems solved by technology

The on-off valves used to date in systems of the type specified above use a deformable metallic material valve member, typically made of synthetic rubber, with consequent problems of tightness when cold.
The use of plastic material valve members is consequently not advantageous, because there is the risk of the material forming the valve member being cut or sheared consequent to the pressure with which it is pressed against the corresponding valve seat, which again causes problems of tightness.

Method used

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  • On-off valve for a gas injection system, particularly of methane, for internal combustion engines
  • On-off valve for a gas injection system, particularly of methane, for internal combustion engines
  • On-off valve for a gas injection system, particularly of methane, for internal combustion engines

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Embodiment Construction

[0021]With reference to FIG. 1, numeral 1 generically indicates a methane electronic injection system for an internal combustion engine. The system comprises a plurality of electromagnetically controlled injectors (or injection valves) 2 associated to the various cylinders in the engine. The assembly details of the injectors 2 are neither described nor illustrated herein, because the injectors can be made in any way according to prior art and because the details are not included in the object of the invention. The injectors 2 receive the methane via the respective lines 3 from a distributing manifold, or rail, 4. The distributing manifold 4 in turn receives the methane from a reservoir 5 where the high pressure methane is accumulated (e.g. at a pressure in the order of 200 bars). The control solenoids of the injectors 2 are controlled by an electronic control unit 6 on the basis of the signals S1, S2, . . . , Sn, indicative of the various parameters of operation of the engine, inclu...

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Abstract

On-off valve intended to be arranged at the outlet of the gas accumulation reservoir in an electronic gas injection system for an internal combustion engine, presenting a valve member made of metallic material, co-operating with a valve seat made in a body, which is also made of metallic material, to ensure the good quality of tightness in all operative temperature and pressure conditions, with prolonged reliability in time.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to gas injection systems, particularly of methane, for internal combustion engines, for the type comprising:[0002]a plurality of electromagnetically controlled injectors, associated to the various cylinders in the engine,[0003]a distributing manifold or rail communicating with said injectors,[0004]a feeding reservoir of the distributing manifold where pressurised gas is accumulated,[0005]a pressure regulating valve interposed in the connection between the reservoir and said distribution manifold,[0006]an electronic control unit set up to control the injectors and to control the opening time to meter the amount of gas injected in each cylinder according to the operating conditions of the engine and,[0007]an on-off valve arranged on the output of the reservoir.[0008]The on-off solenoid valve complies with standards in force and ensures the possibility of hermetically closing the reservoir in any emergency condition, for example in...

Claims

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Application Information

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IPC IPC(8): F02M57/06F02M21/02
CPCF02M21/0209F02M21/0221F02M21/0242F02M21/0245F02M21/0266F02M21/0296F02D19/024F02D19/027F02M21/0254F02M21/0233Y02T10/30
Inventor RICCO, MARIO
Owner METATRON