In-combustion chamber flow control device

Patent metadata

Field	Value
Publication number	US-10626786-B2
Application number	US-201716085617-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Mar 31, 2016
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

Provided is an in-combustion chamber flow control device used in an engine having an intake passage connected to an intake opening formed in a ceiling surface of a combustion chamber, at an angle inclined with respect to a direction of an axis of a cylinder. This in-combustion chamber flow control device comprises a plasma actuator (28) disposed inside the combustion chamber (16). The plasma actuator comprises: a dielectric body (38) disposed along the ceiling surface (16a) of the combustion chamber, at a position closer to a center of the ceiling surface than the intake opening (18a); an exposed electrode (40) disposed on one side of the dielectric body facing the combustion chamber; and an embedded electrode (42) disposed on a side opposite to the exposed electrode across the dielectric body. The embedded electrode is disposed at a position closer to the intake opening than the exposed electrode.

First claim

The invention claimed is:

1. An in-combustion chamber flow control device used in an engine comprising a cylindrical cylinder, a piston received in the cylinder slidably with respect to an inner surface of the cylinder, and a cylinder head which is internally formed with an intake passage connected to an intake opening formed in a ceiling surface of a combustion chamber defined by the cylinder head, the cylinder and the piston, said intake passage being at an angle inclined with respect to a direction of an axis of the cylinder, wherein the in-combustion chamber flow control device is designed to control a flow of gas in the combustion chamber, the in-combustion chamber flow control device being characterized in that in-combustion chamber flow control device comprises a plasma actuator disposed inside the combustion chamber, the plasma actuator comprising: a dielectric body disposed along the ceiling surface at a position closer to a center of the ceiling surface than the intake opening; an exposed electrode disposed on one side of the dielectric body facing the combustion chamber; and an embedded electrode disposed on a side opposite to the exposed electrode across the dielectric body, the embedded electrode being disposed at a position closer to the intake opening than the exposed electrode.

2. The in-combustion chamber flow control device according to claim 1 , wherein each of the exposed electrode and the embedded electrode is disposed to extend along a radial direction of the combustion chamber, in a region between the intake opening and an exhaust opening formed in the ceiling surface of the combustion chamber.

3. An in-combustion chamber flow control device used in an engine comprising a cylindrical cylinder, a piston received in the cylinder slidably with respect to an inner surface of the cylinder, and a cylinder head which is internally formed with an intake passage connected to an intake opening formed in a ceiling surface of a combustion chamber defined by the cylinder head, the cylinder and the piston, said intake passage being at an angle inclined with respect to a direction of an axis of the cylinder, wherein the in-combustion chamber flow control device is designed to control a flow of gas in the combustion chamber, the in-combustion chamber flow control device being characterized in that the in-combustion chamber flow control device comprises a plasma actuator disposed inside the combustion chamber, the plasma actuator comprising: a dielectric body disposed along a piston top surface of the piston of the engine; an exposed electrode disposed on one side of the dielectric body facing the combustion chamber; and an embedded electrode disposed on a side opposite to the exposed electrode across the dielectric body, the embedded electrode being disposed at a position closer to one end of the piston top surface on the side of an exhaust opening, than the exposed electrode.

4. The in-combustion chamber flow control device according to claim 3 , wherein each of the exposed electrode and the embedded electrode is disposed at a position closer to the one end of the piston top surface on the side of the exhaust opening, than to a center of the piston top surface.

5. An in-combustion chamber flow control device used in an engine comprising a cylindrical cylinder, a piston received in the cylinder slidably with respect to an inner surface of the cylinder, and a cylinder head which is internally formed with an intake passage connected to an intake opening formed in a ceiling surface of a combustion chamber defined by the cylinder head, the cylinder and the piston, said intake passage being at an angle inclined with respect to a direction of an axis of the cylinder, wherein the in-combustion chamber flow control device is designed to control a flow of gas in the combustion chamber, the in-combustion chamber flow control device being characterized in that the in-combustion chamber flow control device comprises: a plasma actuator disposed along the ceiling surface of the combustion chamber, at a position closer to a center of the ceiling surface than the intake opening; and a control means to control the plasma actuator, wherein the control means is operable to control the plasma actuator to generate a flow flowing along the ceiling surface in a direction from the plasma actuator toward the intake opening, during an intake stroke of the engine.

6. An in-combustion chamber flow control device used in an engine comprising a cylindrical cylinder, a piston received in the cylinder slidably with respect to an inner surface of the cylinder, and a cylinder head which is internally formed with an intake passage connected to an intake opening formed in a ceiling surface of a combustion chamber defined by the cylinder head, the cylinder and the piston, said intake passage being at an angle inclined with respect to a direction of an axis of the cylinder, wherein the in-combustion chamber flow control device is designed to control a flow of gas in the combustion chamber, the in-combustion chamber flow control device being characterized in that the in-combustion chamber flow control device comprises: a plasma actuator disposed along a piston top surface of the piston of the engine; and a control means to control the plasma actuator, wherein the control means is operable to control the plasma actuator to generate a flow flowing along the piston top surface in a direction from the plasma actuator toward one end of the piston top surface on the side of an exhaust opening, during an intake stroke of the engine.

7. The in-combustion chamber flow control device according to claim 1 , wherein the engine is provided with a fuel injection valve for injecting fuel directly into the cylinder, and a fuel injection valve control device for controlling the fuel injection valve to inject fuel toward a center of a cavity formed in the piston top surface in a downwardly concaved manner, and wherein the in-combustion chamber flow control device is designed to control a flow of gas in the combustion chamber.

8. The in-combustion chamber flow control device according to claim 7 , wherein a reachable distance of fuel injected from the fuel injection valve is less than a distance between the fuel injection valve and a wall surface of the cavity.

Assignees

• Mazda Motor

Inventors

• Uchida Kenji
• Nagasawa Takeshi
• Ono Ryohei

Classifications

• F02M27/042

  by plasma · CPC title

• F02B2023/106

  Tumble flow, i.e. the axis of rotation of the main charge flow motion is horizontal · CPC title

• F02D45/00

  Electrical control not provided for in groups F02D41/00 - F02D43/00 · CPC title

• F02B17/005

  having direct injection in the combustion chamber · CPC title

• F02B23/104 Primary

  the injector being placed on a side position of the cylinder · CPC title