US 6,269,790 B1Granted

Combustion chamber for DISI engines with exhaust side piston bowl

AssigneeFord Global Technologies, LLC

InventorsJianwen Yi, Jialin Yang, Richard Walter Anderson

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Abstract

A stratified-charge combustion system design for direct-injection spark-ignited engines with the piston bowl in the exhaust-valve side. The air flow from the inlet valve provides a normal tumble in cylinder air flow. The fuel injector is positioned on the intake-valve side of the combustion cylinder and forms a charge stratification in the combustion chamber. With the piston bowl on the exhaust-valve side, the distance for spray penetration of the fuel from the injector is extended. The rate of fuel spray penetration in the combustion chamber is reduced by counter air flow against the fuel spray. The air-fuel mixture is moved upwardly to the area of the spark plug by the tumble air flow for ignition. The invention provides less piston bowl wall wetting which results in less soot formation and less emissions of undesirable hydrocarbons.

Claims5

Dependent claims

An in-cylinder injection internal combustion engine having a cylinder bore, a cylinder head, a piston positioned in said cylinder bore, and a combustion chamber formed by a cylinder head lower wall and a top wall of the piston, said engine comprising:

at least one intake port on a first side of said cylinder head lower wall;
at least one exhaust port on a second side of said cylinder head lower wall;
an air intake port communicating with said intake valve and said cylinder head lower wall to provide a tumble flow of inducted air in said combustion chamber;
a spark plug positioned in said cylinder head lower wall between said intake port and said exhaust port;
a combustion bowl positioned in the top wall of the piston, said combustion bowl having a substantially spherical configuration with a majority of the area thereof is positioned in vertical alignment with said second side of said cylinder head lower wall and adjacent the exhaust port;
and
a fuel injector for directly injecting fuel into said combustion chamber, said fuel injector positioned on said first side of said cylinder head lower wall adjacent said intake port and oriented to direct a fuel spray toward said combustion bowl;
said cylinder bore having a first vertical axis and said combustion bowl having a second vertical axis, said second vertical axis being positioned 5 to 15 millimeters offset from said first vertical axis in the direction of said exhaust port;
and said tumble flow of air is directed against the direction of the fuel spray from said fuel injector during at least a portion of the combustion cycle of the piston in the cylinder bore.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/434,347Filed 5 Nov 1999
Granted: 7 Aug 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F02B 23/104
With separate admission of air and fuel into cylinder: the injector being placed on a side position of the cylinder
F02B 2023/106
With separate admission of air and fuel into cylinder: tumble flow, i.e. the axis of rotation of the main charge flow motion is horizontal
F02B 2275/48
Other engines, components or details, not provided for in other groups of this subclass: tumble motion in gas movement in cylinder
Y02T 10/12
Internal combustion engine [ICE] based vehicles: improving ICE efficiencies