Patent US4807572A successfully refreshed from Google Patents.
US4807572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Timing of fuel injected engines
Assignee: Delphi Technologies Inc
•
Filing: 1986-07-18
•
Granted: 1989-02-28
•
Expires: 2006-07-18
Abstract
Abstract A method of operating a two-stroke spark ignition engine (9) wherein the fuel is injected directly into the combustion chamber (22). The timing of the injection of the fuel is varied according to engine load and speed conditions. Under low load and speed conditions at least 80% of the fuel is injected after closure of the exhaust port (20) whereas under some high load conditions at least 80% of the fuel is injected before closure of the exhaust port (20). The method may also comprise adjustment of ignition timing so that, in conjunction with low load and speed conditions, ignition occurs at least 5° of crankshaft rotation after commencement of fuel injection and up to 70° before top dead center of the engine cycle.
Inventors
- 👤 Christopher K. Schlunke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:37
CPC Classifications
F; F02; F02D; F02D3/00; F02M; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0635; F02M51/0642; F02M51/0653; F02B; F02B75/00; F02B75/02; F02D7/00; F02D7/02; F02M51/08; F02M67/00; F02M67/10; F02M67/12; F02B1/00; F02B1/02; F02B1/04; F02B2075/022; F02B2075/025; F02B75/12; F02B2075/125; F02B61/00; F02B61/04; F02B61/045; F02D41/00; F02D41/30; F02D41/38; F02D2041/389; F02D2400/00; F02D2400/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
112 words
A method of operating a spark ignited two cycle internal combustion engine having a combustion chamber, and an exhaust port opened and closed in timed relation to the engine cycle to control the exhausting of gases from the combustion chamber, said method comprising, injecting a metered quantity of fuel directly into the combustion chamber so that at low engine loads and speeds at least 80% of the metered quantity of fuel is delivered into the combustion chamber after the exhaust port has closed, and at least at some high engine load at least 80% of the metered quantity of fuel is delivered into the combustion chamber before the exhaust port has closed.
Claim 2
Independent Claim
112 words
A method of operating a spark ignited two cycle internal combustion engine having a combustion chamber, and an exhaust port opened and closed in timed relation to the engine cycle to control the exhausting of gases from the combustion chamber, said method comprising, injecting a metered quantity of fuel directly into the combustion chamber so that at low engine loads and speeds at least 80% of the metered quantity of fuel is delivered into the combustion chamber after the exhaust port has closed, and at least at some high engine load at least 80% of the metered quantity of fuel is delivered into the combustion chamber before the exhaust port has closed.
Claim 3
Independent Claim
111 words
A method of operating a spark ignited two cycle internal combustion engine having a combustion chamber, and an exhaust port opened and closed in timed relation to the engine cycle to control the exhausting of gases from the combustion chamber, said method comprising, injecting a metered quantity of fuel directly into the combustion chamber so that at low engine loads and speeds at least 80% of the metered quantity of fuel is delivered into the combustion chamber after the exhaust port has closed, and at high engine loads and speeds at least 80% of the metered quantity of fuel is delivered into the combustion chamber before the exhaust port has closed.
Claim 4
Independent Claim
111 words
A method of operating a spark ignited two cycle internal combustion engine having a combustion chamber, and an exhaust port opened and closed in timed relation to the engine cycle to control the exhausting of gases from the combustion chamber, said method comprising, injecting a metered quantity of fuel directly into the combustion chamber so that at low engine loads and speeds at least 80% of the metered quantity of fuel is delivered into the combustion chamber after the exhaust port has closed, and at high engine loads and speeds at least 80% of the metered quantity of fuel is delivered into the combustion chamber before the exhaust port has closed.
Claim 5
Dependent Claim
35 words
A method as claimed in claim 1 or 2 wherein at high engine loads and speeds substantially all the metered quantities of fuel is delivered into the combustion chamber before the exhaust port is closed.
Claim 6
Dependent Claim
36 words
A method as claimed in claim 1 or 2 wherein at low loads and speed injection fuel into the combustion chamber is commenced at 5° or more before ignition of the fuel in the combustion chamber.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 1 or 2 wherein at low loads and speeds injection of fuel into the combustion chamber is commenced up to 30° after exhaust port closure.
Claim 8
Dependent Claim
35 words
A method as claimed in claim 1 or 2 wherein at least at some high loads and speeds injection of fuel into the combustion chamber is commenced before bottom dead centre of the engine cycle.
Claim 9
Dependent Claim
52 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed.
Claim 10
Dependent Claim
46 words
A method as claimed in claim 1 or 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, injection of fuel into the combustion chamber is commenced up to 30° after exhaust port closure.
Claim 11
Independent Claim
57 words
A method as claimed in any one of claims 1 or 2, wherein at least some high loads and speeds injection of fuel into the combustion chamber is commenced before bottom dead centre of the engine cycle and substantially all the metered quantities of fuel is delivered into the combustion chamber before the exhaust port is closed.
Claim 12
Dependent Claim
19 words
A method as claimed in claim 6, wherein said injection is commenced before the exhaust port commences to open.
Claim 13
Dependent Claim
32 words
A method as claimed in claim 1 or 2, wherein at least at some high loads and speeds injection of fuel into the combustion chamber is terminated before the exhaust port closes.
Claim 14
Dependent Claim
78 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed and at high engine loads and speeds substantially all the metered quantities of fuel are delivered into the combustion chamber before the exhaust port is closed.
Claim 15
Dependent Claim
77 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered at the combustion chamber after the exhaust port is closed and at least some high loads and speeds injection of fuel into the combustion chamber is commenced before bottom dead centre of the engine cycle.
Claim 16
Dependent Claim
39 words
A method as claimed in claim 1 or 2, wherein at least at some low engine loads ignition of the fuel in the combustion chamber is initiated between 40° and 70° before top dead centre of the engine cycle.
Claim 17
Dependent Claim
39 words
A method as claimed in claim 1 or 2, wherein at least at some low engine loads ignition of the fuel in the combustion chamber is initiated at or before 50° before top dead centre of the engine cycle.
Claim 18
Dependent Claim
39 words
A method as claimed in claim 1 or 2, wherein at least at some low engine loads ignition of the fuel in the combustion chamber is initiated between 50° and 65° before top dead centre of the engine cycle.
Claim 19
Dependent Claim
75 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed, and ignition of the fuel in the combustion chamber is initiated between 40° and 70° before top dead centre of the engine cycle.
Claim 20
Dependent Claim
75 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed, and ignition of the fuel in the combustion chamber is initiated at or before 50° before top dead centre of the engine cycle.
Claim 21
Dependent Claim
75 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the low attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed, and ignition of the fuel in the combustion chamber is initiated between 50° and 65° before top dead centre of the engine cycle.
Claim 22
Dependent Claim
60 words
A method as claimed in claim 1 or 2, wherein at low loads and speeds, injection of fuel into the combustion chamber is commenced at 5° or more before ignition of the fuel in the combustion chamber, and ignition of the fuel in the combustion chamber is initiated at or before 50° before top dead centre of the engine cycle.
Claim 23
Dependent Claim
60 words
A method as claimed in claim 1 or 2, wherein at low loads and speeds, injection of fuel into the combustion chamber is commenced at 5° or more before ignition of the fuel in the combustion chamber, and ignition of the fuel in the combustion chamber is initiated between 50° and 65° before top dead centre of the engine cycle.
Claim 24
Dependent Claim
54 words
A method as claimed in claim 1 or 2, wherein at low loads and speeds injection of fuel into the combustion chamber is commenced up to 30° after exhaust port closure, and ignition of the fuel in the combustion chamber is initiated between 40° and 70° before top dead centre of the engine cycle.
Claim 25
Dependent Claim
55 words
A method as claimed in claim 1 or 2, wherein at low loads and speeds injection of the fuel into the combustion chamber is commenced up to 30° after exhaust port closure, and ignition of the fuel in the combustion chamber is initiated between 50° and 65° before top dead centre of the engine cycle.
Claim 26
Dependent Claim
69 words
A method as claimed in claim 1 or 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, injection of fuel into the combustion chamber is commenced up to 30° after exhaust port closure, and ignition of the fuel in the combustion chamber is initiated between 40° and 70° before top dead centre of the engine cycle.
Claim 27
Dependent Claim
69 words
A method as claimed in claim 1 or 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, injection of fuel into the combustion chamber is commenced up to 30° after exhaust port closure, and ignition of the fuel in the combustion chamber is initiated between 50° and 65° before top dead centre of the engine cycle.
Claim 28
Dependent Claim
101 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed and at high engine loads and speeds substantially all the metered quantities of fuel are delivered into the combustion chamber before the exhaust port is closed, and ignition of the fuel in the combustion chamber is initiated between 40° and 70° before top dead centre of the engine cycle.
Claim 29
Dependent Claim
101 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed and at high engine loads and speeds substantially all the metered quantities of fuel are delivered into the combustion chamber before the exhaust port is closed, and ignition of the fuel in the combustion chamber is initiated between 50° and 65° before top dead centre of the engine cycle.
Claim 30
Dependent Claim
100 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed and at least some high loads and speeds injection of fuel into the combustion chamber is commenced before bottom dead centre of the engine cycle, and ignition of the fuel in the combustion chamber is initiated between 40° and 70° before top dead centre of the engine cycle.
Claim 31
Dependent Claim
100 words
A method as claimed in claim 1 or claim 2, wherein at low engine speeds in conjunction with engine loads below 25% of the load attainable at the particular engine speed, at least 80% of the metered quantity of fuel is delivered to the combustion chamber after the exhaust port is closed and at least some high loads and speeds injection of fuel into the combustion chamber is commenced before bottom dead centre of the engine cycle, and ignition of the fuel in the combustion chamber is initiated between 50° and 65° before top dead centre of the engine cycle.
Claim 32
Dependent Claim
41 words
A method as claimed in claim 1 or 2, wherein the metered quantity of fuel is entrained in a gas to form a fuel-gas charge and said charge is injected into the combustion chamber to effect delivery of the fuel thereinto.
Claim 33
Dependent Claim
64 words
A method as claimed in claim 1 or 2, wherein at low loads and speeds injection of fuel into the combustion chamber is commenced up to 30° after exhaust port closure, and wherein the metered quantity of fuel is entrained in a gas to form a fuel-gas charge and said charge is injected into the combustion chamber to effect delivery of the fuel thereinto.
Claim 34
Dependent Claim
67 words
A method as claimed in claim 1 or 2, wherein at least some high loads and speeds injection of fuel into the combustion chamber is commenced before bottom dead centre of the engine cycle, and wherein the metered quantity of fuel is entrained in a gas to form a fuel-gas charge and said charge is injected into the combustion chamber to effect delivery of the fuel thereinto.
Claim 35
Dependent Claim
72 words
A method as claimed in claim 1 or 2, wherein at least at some low engine loads ignition of the fuel in the combustion chamber is initiated between 40° and 70° before top dead centre of the engine cycle, and wherein the metered quantity of fuel is entrained in a gas to form a fuel-gas charge and said charge is injected into the combustion chamber to effect delivery of the fuel thereinto.
Claim 36
Dependent Claim
19 words
An internal combustion engine adapted to operate in accordance with the method as claimed in claim 1 or 2.
Claim 37
Dependent Claim
23 words
In an automative vehicle, an internal combustion engine adapted to operate in accordance with the method as claimed in claim 1 or 2.
Claim 38
Dependent Claim
26 words
An internal combustion engine adapted to operate in accordance with the method as claimed in claim 1 or 2 said engine being an outboard marine engine.
References Cited (Backward Citations)
US2246019A
Cited
US3190271A
Cited
US4062335A
Cited
US4217871A
Cited
US4235374A
Cited
JPS57430A
Cited
US4407241A
Cited
US4445468A
Cited
US4628881A
Cited
US4700668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |