US5404843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection device for multi cylinder two stroke engine
Assignee: Yamaha Marine Co Ltd
•
Filing: 1993-10-21
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Granted: 1995-04-11
•
Expires: 2013-10-21
Abstract
Abstract A system for controlling the supply of fuel to a multiple cylinder, two cycle, crankcase compression, internal combustion engine wherein air flow is normally measured by a pressure sensor in the crankcase chamber of only one of the cylinders. When an abnormal condition is sensed, the supply of fuel to the cylinder associated with the pressure sensor is discontinued and in some embodiments, the control of the fuel to the other cylinders is accomplished by means other than pressure sensing.
Inventors
- 👤 Masahiko Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:04
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/22; F02D41/222; F02D41/30; F02D41/32; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02D2041/227; F02D2400/00; F02D2400/04
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
148 words
A two stroke, crankcase compression, internal combustion engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bores and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from each other, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, abnormal condition sensing means for sensing an abnormal condition which may affect the operation of said pressure sensor, and means for discontinuing the supply of fuel to the cylinder associated with said one of said crankcase chambers upon the sensing of an abnormal condition by said abnormal condition sensing means.
Claim 2
Dependent Claim
148 words
A two stroke, crankcase compression, internal combustion engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bores and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from each other, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, abnormal condition sensing means for sensing an abnormal condition which may affect the operation of said pressure sensor, and means for discontinuing the supply of fuel to the cylinder associated with said one of said crankcase chambers upon the sensing of an abnormal condition by said abnormal condition sensing means.
Claim 3
Dependent Claim
40 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 1 wherein fuel is supplied to the other cylinder when the supply of fuel to the cylinder associated with the one of the crankcase chambers is discontinued.
Claim 4
Dependent Claim
53 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 2 wherein the supply of fuel to the other cylinder is controlled by a means different than the output of the crankcase pressure sensor when the supply of fuel to the cylinder associated with the one crankcase chamber is discontinued.
Claim 5
Dependent Claim
37 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 1 wherein the abnormal condition sensing means senses when a throttle valve associated with the engine is not opened more than a predetermined degree.
Claim 6
Dependent Claim
40 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 4 wherein fuel is supplied to the other cylinder when the supply of fuel to the cylinder associated with the one of the crankcase chambers is discontinued.
Claim 7
Dependent Claim
34 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 1 wherein the abnormal condition sensing means senses a pressure in the crankcase chamber which is greater than a predetermined pressure.
Claim 8
Dependent Claim
40 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 6 wherein fuel is supplied to the other cylinder when the supply of fuel to the cylinder associated with the one of the crankcase chambers is discontinued.
Claim 9
Dependent Claim
53 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 7 wherein the supply of fuel to the other cylinder is controlled by a means different than the output of the crankcase pressure sensor when the supply of fuel to the cylinder associated with the one crankcase chamber is discontinued.
Claim 10
Dependent Claim
42 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 8 wherein the amount of fuel supplied to the other cylinder is determined by the opening of the throttle valve of the engine and the speed of the engine.
Claim 11
Dependent Claim
23 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 1 wherein the charge forming means comprises a fuel injector.
Claim 12
Dependent Claim
26 words
A two stroke, crankcase compression, internal combustion engine as set forth in claim 10 wherein is there is provided a separate fuel injector for each cylinder.
Claim 13
Independent Claim
151 words
A method of operating a two stroke, crankcase compression, internal combustion engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bores and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from each other, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, said method comprising the steps of sensing an abnormal condition which may affect the operation of said pressure sensor, and discontinuing the supply of fuel to the cylinder associated with said one of said crankcase chambers upon the sensing of an abnormal condition by said abnormal condition sensing means.
Claim 14
Independent Claim
151 words
A method of operating a two stroke, crankcase compression, internal combustion engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bores and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from each other, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, said method comprising the steps of sensing an abnormal condition which may affect the operation of said pressure sensor, and discontinuing the supply of fuel to the cylinder associated with said one of said crankcase chambers upon the sensing of an abnormal condition by said abnormal condition sensing means.
Claim 15
Dependent Claim
34 words
A method as set forth in claim 12 wherein fuel is supplied to the other cylinder when the supply of fuel to the cylinder associated with the one of the crankcase chambers is discontinued.
Claim 16
Dependent Claim
47 words
A method as set forth in claim 13 wherein the supply of fuel to the other cylinder is controlled by a means different than the output of the crankcase pressure sensor when the supply of fuel to the cylinder associated with the one crankcase chamber is discontinued.
Claim 17
Dependent Claim
30 words
A method as set forth in claim 12 wherein the abnormal condition is sensed when a throttle valve associated with the engine is not opened more than a predetermined degree.
Claim 18
Dependent Claim
34 words
A method as set forth in claim 15 wherein fuel is supplied to the other cylinder when the supply of fuel to the cylinder associated with the one of the crankcase chambers is discontinued.
Claim 19
Dependent Claim
26 words
A method as set forth in claim 12 wherein the abnormal condition comprises a pressure in the crankcase chamber which is greater than a predetermined pressure.
Claim 20
Dependent Claim
34 words
A method as set forth in claim 17 wherein fuel is supplied to the other cylinder when the supply of fuel to the cylinder associated with the one of the crankcase chambers is discontinued.
Claim 21
Dependent Claim
45 words
A method as set forth in claim 18 wherein the supply of fuel to the other cylinder is controlled other than by the output of the crankcase pressure sensor when the supply of fuel to the cylinder associated with the one crankcase chamber is discontinued.
Claim 22
Dependent Claim
36 words
A method as set forth in claim 19 wherein the amount of fuel supplied to the other cylinder is determined by the opening of a throttle valve of the engine and the speed of the engine.
Claim 23
Dependent Claim
17 words
A method as set forth in claim 12 wherein the charge forming means comprises a fuel injector.
Claim 24
Dependent Claim
20 words
A method as set forth in claim 21 wherein is there is provided a separate fuel injector for each cylinder.
Claim 25
Dependent Claim
151 words
A two stroke, crankcase compression engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bore and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from the others, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, abnormal condition sensing means for sensing an abnormal condition which may affect the operation of said pressure sensor, and means for controlling the supply of fuel to the cylinder other than the cylinder associated with the one of the cylinders in response to other conditions when the abnormal condition sensing means senses an abnormal condition.
Claim 26
Dependent Claim
151 words
A two stroke, crankcase compression engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bore and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from the others, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, abnormal condition sensing means for sensing an abnormal condition which may affect the operation of said pressure sensor, and means for controlling the supply of fuel to the cylinder other than the cylinder associated with the one of the cylinders in response to other conditions when the abnormal condition sensing means senses an abnormal condition.
Claim 27
Dependent Claim
27 words
A two stroke, crankcase compression engine as set forth in claim 23 wherein fuel is supplied only to the other cylinder when the abnormal condition is sensed.
Claim 28
Dependent Claim
21 words
A two stroke, crankcase compression engine as set forth in claim 24 wherein the abnormal condition sensed is a backfire condition.
Claim 29
Dependent Claim
36 words
A two stroke, crankcase compression engine as set forth in claim 25 wherein the supply of fuel to the cylinder associated with the one of the crankcase chambers is discontinued when the abnormal condition is sensed.
Claim 30
Independent Claim
154 words
A method of operating a two stroke, crankcase compression engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bore and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from the others, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, said method comprising the steps of sensing an abnormal condition which may affect the operation of said pressure sensor, and controlling the supply of fuel to the cylinder other than the cylinder associated with the one of the cylinders in response to other conditions when the abnormal condition sensing means senses an abnormal condition.
Claim 31
Independent Claim
154 words
A method of operating a two stroke, crankcase compression engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bore and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from the others, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, said method comprising the steps of sensing an abnormal condition which may affect the operation of said pressure sensor, and controlling the supply of fuel to the cylinder other than the cylinder associated with the one of the cylinders in response to other conditions when the abnormal condition sensing means senses an abnormal condition.
Claim 32
Dependent Claim
23 words
A method as set forth in claim 27 wherein fuel is supplied only to the other cylinder when the abnormal condition is sensed.
Claim 33
Dependent Claim
17 words
A method as set forth in claim 28 wherein the abnormal condition sensed is a backfire condition.
Claim 34
Dependent Claim
32 words
A method as set forth in claim 29 wherein the supply of fuel to the cylinder associated with the one of the crankcase chambers is discontinued when the abnormal condition is sensed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |