Patent US4579858A successfully refreshed from Google Patents.
Patent US5134984A successfully refreshed from Google Patents.
US5134984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system of internal combustion engine
Assignee: Yamaha Marine Co Ltd
•
Filing: 1991-08-13
•
Granted: 1992-08-04
•
Expires: 2011-08-13
Abstract
Abstract This invention relates to a fuel injection apparatus for an internal combustion engine, and more particularly to an improved control arrangement for a fuel injection arrangement. In accordance with the invention, an arrangement is disclosed for determining the mass of air taken into the engine crankcase chamber by calculating an average intake air mass which is based not on pressure measurements taken upon each crankshaft rotation individually, but on the arithmetical mean of such pressure measurements taken during a plurality of crankshaft rotations. Thus, a fuel injection control system is achieved which senses differences in crankcase pressure and which eliminates the effects of abnormal changes in crankcase pressure due to effects other than the amount of air inducted.
Inventors
- 👤 Kimihiro Nonaka
- 👤 Yukio Matsushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:25
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/30; F02D41/32; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/12; F02B2075/125; F02D2400/00; F02D2400/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
62 words
A fuel injection arrangement for an internal combustion engine comprising a crankcase chamber and a rotatable crankshaft, said crankshaft disposed within said crankcase chamber, and means for inducting an air charge into said crankcase chamber during engine operation; and, further, means for calculating an arithmetical mean air pressure value over a plurality of rotation cycles of said crankshaft within said crankcase chamber.
Claim 2
Dependent Claim
62 words
A fuel injection arrangement for an internal combustion engine comprising a crankcase chamber and a rotatable crankshaft, said crankshaft disposed within said crankcase chamber, and means for inducting an air charge into said crankcase chamber during engine operation; and, further, means for calculating an arithmetical mean air pressure value over a plurality of rotation cycles of said crankshaft within said crankcase chamber.
Claim 3
Dependent Claim
34 words
The fuel injection arrangement of claim 1 further comprising a fuel injection device for injecting fuel into said air charge; and means for controlling the amount of fuel delivered by said fuel injection device.
Claim 4
Dependent Claim
31 words
The fuel injection arrangement of claim 2 wherein said means for controlling the amount of fuel delivered by said fuel injection device is responsive to said arithmetical mean air pressure value.
Claim 5
Dependent Claim
40 words
The fuel injection arrangement of claim 3 wherein said means for calculating an arithmetical mean air pressure value over a plurality of rotation cycles of said crankshaft within said crankcase chamber comprises a pressure sensor positioned within said crankcase chamber.
Claim 6
Dependent Claim
43 words
The fuel injection arrangement of claim 4 further comprising a combustion chamber and a scavenging passage, said scavenging passage leading from said crankcase chamber to said combustion chamber; and a scavenging port, said scavenging port communicating said scavenging passage with said crankcase chamber.
Claim 7
Dependent Claim
57 words
The fuel injection arrangement of claim 5 further comprising a piston and a cylinder head, said piston reciprocal within said cylinder head; and wherein a portion of said piston blocks said scavenging port during a portion of its stroke, thereby temporarily closing said scavenging port; said scavenging port being opened when said piston does not block it.
Claim 8
Dependent Claim
19 words
The fuel injection arrangement of claim 6 wherein said pressure sensing device is positioned near to said scavenging port.
Claim 9
Dependent Claim
77 words
The fuel injection arrangement of claim 6 wherein said means for calculating an arithmetical mean air pressure value over a plurality of rotation cycles of said crankshaft within said crankcase chamber further comprises a crank angle sensor, positioned adjacent to said crankshaft, and a pulser coil, positioned about said crankshaft, said crank angle sensor and said pulser coil operative to determine timings at which said scavenging port is opened and at which said scavenging port is closed.
Claim 10
Dependent Claim
43 words
The fuel injection arrangement of claim 8 wherein said pressure sensing device is operative to measure said pressure within said crankcase at a time at which said scavenging port is opened, and also, at a time at which said scavenging port is closed.
Claim 11
Dependent Claim
46 words
The fuel injection arrangement of claim 9 wherein a predetermined number of pressure measurements are taken within said crankcase chamber at said scavenging port opening timing and said scavenging port closing timing, corresponding to a plurality of rotation cycles of said crankshaft within said crankcase chamber.
Claim 12
Dependent Claim
71 words
The fuel injection arrangement of claim 10 wherein said means for calculating an arithmetical mean air pressure value over a plurality of rotation cycles of said crankshaft within said crankcase chamber further comprises a pressure averaging system, wherein said predetermined number of pressure measurements are averaged, thereby providing an averaged pressure value corresponding to said scavenging port opening timing and an averaged pressure value corresponding to said scavenging port closing timing.
Claim 13
Dependent Claim
61 words
The fuel injection arrangement of claim 11 wherein said means for calculating an arithmetical mean air pressure value over a plurality of rotation cycles of said crankshaft within said crankcase chamber further comprises an air mass calculating system operational to receive said averaged pressure values in order to calculate an averaged intake air mass value based upon said averaged pressure values.
Claim 14
Dependent Claim
54 words
The fuel injection arrangement of claim 12 wherein said means for controlling the amount of fuel delivered by said fuel injection device comprises an electronic control unit; said electric control unit operable to receive various input signals, indicative of engine operating conditions, and to output a control signal for controlling said fuel injection device.
Claim 15
Dependent Claim
30 words
The fuel injection arrangement of claim 13 wherein said input signals include said averaged intake air mass value, and said scavenging port opening timing and said scavenging port closing timing.
Claim 16
Dependent Claim
55 words
The fuel injection arrangement of claim 14 wherein said predetermined number of pressure measurements taken at said scavenging port opening timing and said scavenging port closing timing, corresponding to said plurality of rotation cycles of said crankshaft within said crankcase chamber, is greater than or equal to two and less than or equal to ten.
Claim 17
Independent Claim
128 words
A method of controlling a fuel injection system for an internal combustion engine having a crankcase chamber, an induction system for delivering an air charge to the crankcase chamber, a combustion chamber, a scavenging passage for delivering the air charge from the crankcase chamber to the combustion chamber, and a fuel injection means for delivering an amount of fuel for mixing with the air charge comprising the steps of measuring the air pressure within said crankcase chamber a predetermined number of times over a plurality of rotation cycles of said crankshaft within said crankcase chamber, calculating an arithmetical mean air pressure value from said air pressure measurements, and controlling the amount of fuel discharged by the fuel injection means in response to the calculated arithmetical mean air pressure.
Claim 18
Independent Claim
128 words
A method of controlling a fuel injection system for an internal combustion engine having a crankcase chamber, an induction system for delivering an air charge to the crankcase chamber, a combustion chamber, a scavenging passage for delivering the air charge from the crankcase chamber to the combustion chamber, and a fuel injection means for delivering an amount of fuel for mixing with the air charge comprising the steps of measuring the air pressure within said crankcase chamber a predetermined number of times over a plurality of rotation cycles of said crankshaft within said crankcase chamber, calculating an arithmetical mean air pressure value from said air pressure measurements, and controlling the amount of fuel discharged by the fuel injection means in response to the calculated arithmetical mean air pressure.
References Cited (Backward Citations)
US4461260A
Cited
US4593667A
Cited
US4671242A
Cited
JPS6340257A
Cited
US4750464A
Cited
US4903649A
Cited
JPH024785A
Cited
US4958516A
Cited
US4987773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |