Hybrid internal combustion reciprocating engine

• US 4,765,293 A
• Filed: 05/07/1986
• Issued: 08/23/1988
• Est. Priority Date: 05/07/1986
• Status: Expired due to Term

• Current Assignee: Textron Innovations Incorporated (Textron Inc)
• Original Assignee: Cessna Aircraft Company (Textron Inc)
• Inventors: Gonzalez, Cesar
• Primary Examiner(s): Nelli, Raymond A.
• Application Number:
  US06/860,506
• Time in Patent Office: 839 Days
• Field of Search: 123/275, 123/262, 123/279, 123/DIG. 7, 123/259
• US Class Current: 123/275
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder
• CPC Class Codes: F02B 19/1004 details of combustion chamber, e.g. mounting arrangements
• CPC Class Codes: F02B 2075/027 four
• CPC Class Codes: F02B 23/0624 Swirl flow
• CPC Class Codes: F02B 23/0639 the combustion space having substantially the shape of a cylinder
• CPC Class Codes: F02B 23/08 with positive ignition
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02B 69/06 for different cycles, e.g. convertible from two-stroke to four stroke
• CPC Class Codes: F02F 3/02 having means for accommodating or controlling heat expansion
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y10S 123/07 Convertible

Abstract

A low compression reciprocating internal combustion piston engine with a prechamber in the head connected to a main combustion chamber in the piston, the prechamber having an igniter, a pilot fuel injector and connecting lineal passage; the main chamber including a fuel injector for mixing the prechamber gases with the gases being compressed in the cylinder. The engine is a hybrid having transitional combustion modes from spark-ignited stratified charge mode at low power, to a spark-assisted compression ignition at higher power loads, and a strictly compression ignition mode at maximum power loads.

Claims

1. A hybrid type reciprocating internal combustion turbine fuel engine with combined spark ignition, torch-assisted to compression ignition modes comprising:

a cylinder;

a cylinder head mounted on the cylinder having a substantially planar inner surface;

exhaust and inlet valves positioned in the head connected to corresponding exhaust and unthrottled inlet passages;

a piston reciprocally mounted within the cylinder having a top surface thereon which surface in the top dead center position of the piston is in close proximity with the inner surface of of the cylinder head;

a substantially spherical precombustion chamber located in the head;

a lineal passage tangentially joining the precombustion chamber with the inner surface of the cylinder head;

a pilot fuel injector means and an igniter means both located in the precombustion chamber which inject and ignite a precharge;

a main fuel injector means in the cylinder head;

a bowl-shaped recess comprising the main combustion chamber located in the top surface of the piston in close proximity with the main injector means in the top dead center position with said lineal passage tangentially aligned with the main combustion chamber, whereby the burning gases exiting the precombustion chamber are directed into the main combustion chamber causing ignition therein.

2. A hybrid type reciprocating internal combustion engine as set forth in claim 1, including:

a ramp means located in the top surface of the piston longitudinally aligned with said lineal passage when the piston is in the top dead center position.

3. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein there is a timing delay between the pilot and main injector means.

4. A hybrid type reciprocating internal combustion engine as set forth in claim 1 wherein the pilot injection precharge ignites by compression ignition in a medium to high power range.

5. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein the precombustion chamber includes a temperature insulating liner means which raises the surface temperature to assist and accelerate combustion.

6. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein the main combustion chamber includes a temperature insulating liner means which raises the surface temperature to assist and accelerate combustion.

7. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein the compression ratio of the engine is in the range of 1:

7 to 1;

16 and the fuel utilized includes a range of diesel and turbine fuels.

8. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein the exhaust valve is positioned in substantially overlapping relation with the main combustion recess.

9. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein the compression ratio of the engine is in the range of 1:

10 to 1;

12 and the fuel utilized includes a range of diesel and turbine fuels.

10. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein the pilot injector means provides a substantially constant flow rate per cycle at varying flow rates of the main injector means.

11. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein the pilot injector means provides a variable flow rate per cycle at varying flow rates of the main injector means.

12. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein there are multiple lineal passages between the precombustion and main combustion chambers, one of which tangentially joins the precombustion chamber.

13. A hybrid type reciprocating internal combustion engine as set forth in claim 1, wherein the compression ratio of the engine is in the range of 1:

10, to 1;

13 and the fuel utilized includes a range of diesel and turbine fuels.