Multipoint ignition systems and methods

Patent metadata

Field	Value
Publication number	US-9915189-B2
Application number	US-201514945560-A
Country	US
Kind code	B2
Filing date	Nov 19, 2015
Priority date	Nov 19, 2015
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

The disclosure describes multipoint ignition systems for an engine and methods of operation of the same. The systems and methods can include an engine, including an engine block having at least one cylinder bore, a piston having a piston crown facing a flame deck surface such that a combustion main chamber is defined within a cylinder bore and located between the piston crown and the flame deck surface, the piston crown further including a piston bowl having a generally concave shape, and a combustion pre-chamber having a nozzle tip disposed in fluid communication with the combustion main chamber, the nozzle tip having at least one nozzle opening configured to inject a fuel jet into the combustion main chamber, wherein the piston includes a piston wall located around a circumference of the piston bowl, the piston wall including at least one cavity.

First claim

I claim:

1. A piston for use in an engine, comprising:
a body portion having a generally cylindrical shape, and the body portion configured to reciprocate within a cylinder bore of the engine; and
a crown portion coupled to the body portion, the crown portion further including a piston bowl having a generally concave shape;
wherein the piston includes a piston wall located around a circumference of the piston bowl, the piston wall including at least one cavity, the at least one cavity having an inlet in fluid communication with the piston bowl.

2. The piston of claim 1 , wherein the at least one cavity includes an outlet in fluid communication with a combustion main chamber of the cylinder bore and located on a top surface of the piston, wherein the at least one cavity comprises a generally circular cross section and extends in a radial direction relative to the cylinder bore.

3. The piston of claim 2 , wherein a diameter of the at least one cavity is constant between the inlet and the outlet, and wherein the outlet of the at least one cavity has a plurality of cavity nozzles.

4. A piston for use in an engine, comprising:
a body portion having a generally cylindrical shape, the body portion configured to reciprocate within a cylinder bore of the engine; and
a crown portion coupled to the body portion, the crown portion further including a piston bowl having a generally concave shape;

wherein the piston includes a piston wall located around a circumference of the piston bowl, the piston wall including at least one cavity, the at least one cavity having an inlet in fluid communication with the piston bowl;
wherein the at least one cavity includes an outlet in fluid communication with a combustion main chamber of the cylinder bore and located on a top surface of the piston.

5. The piston of claim 4 , wherein the at least one cavity comprises a generally circular cross section and extends in a radial direction relative to the cylinder bore.

6. The piston of claim 5 , wherein a diameter of the at least one cavity is constant between the inlet and the outlet, and wherein the outlet of the at least one cavity has a plurality of cavity nozzles.

Assignees

• Caterpillar Inc

Inventors

• Singh Jaswinder

Classifications

• F02F3/285

  the head being provided with an insert located in or on the combustion-gas-swept surface · CPC title

• F02B19/18 Primary

  Transfer passages between chamber and cylinder · CPC title

• F02B23/0633

  the combustion space being almost completely enclosed in the piston, i.e. having a small inlet in comparison to its volume · CPC title

• F02B19/10

  with fuel introduced partly into pre-combustion chamber, and partly into cylinder · CPC title

• F02B43/00

  Engines characterised by operating on gaseous fuels; Plants including such engines (engines characterised by the gas-air charge being ignited by compression ignition of an additional fuel F02B7/06; engines convertible from gas to other fuel consumption F02B69/04) · CPC title