Patent US5117793A successfully refreshed from Google Patents.
US5117793A
Expired / Lapsed
US
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High pressure fuel injection unit
Assignee: Yamaha Motor Co Ltd
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Filing: 1991-02-15
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Granted: 1992-06-02
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Expires: 2011-02-15
Abstract
Abstract A fuel injection system and method for a fuel injected engine of the multi cylinder type for minimizing variations in crankshaft speed due to variations in individual cylinder to cylinder firing. These variations are compensated for by changing the fuel injection and specifically the duration of the fuel injection. The engine speed is measured for each cylinder either by the time required to reach top dead center from a predetermined angle, the time to reach bottom dead center from a predetermined angle, or from the average speed.
Inventors
- 👤 Jun Taue
- 👤 Hidenori Suhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:16
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/008; F02D41/0085; F02D41/02; F02D41/14; F02D41/1497; F02D41/1498; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
69 words
A fuel injection system for a multi cylinder engine comprising fuel injection means for delivering fuel directly into the cylinders of the engine, means for measuring the rotational speed of said engine in timed relation to the firing of each of said cylinders during the running of the engine, and means for adjusting said fuel injection means for minimizing variations in engine speed due to cylinder to cylinder variations.
Claim 2
Dependent Claim
69 words
A fuel injection system for a multi cylinder engine comprising fuel injection means for delivering fuel directly into the cylinders of the engine, means for measuring the rotational speed of said engine in timed relation to the firing of each of said cylinders during the running of the engine, and means for adjusting said fuel injection means for minimizing variations in engine speed due to cylinder to cylinder variations.
Claim 3
Dependent Claim
35 words
A fuel injection system for a multi cylinder engine as set forth in claim 1 wherein the engine operates on a diesel cycle and combustion is initiated by a pressure increase in the combustion chamber.
Claim 4
Dependent Claim
23 words
A fuel injection system as set forth in claim 1 wherein the fuel injection means comprises an individual fuel injector for each cylinder.
Claim 5
Dependent Claim
26 words
A fuel injection system as set forth in claim 3 wherein the amount of fuel injected by the fuel injectors is adjusted to minimize speed variations.
Claim 6
Dependent Claim
24 words
A fuel injection system as set forth in claim 4 wherein the amount of fuel injected is varied by changing the duration of injection.
Claim 7
Dependent Claim
22 words
A fuel injection system as set forth in claim 1 wherein the rotational speed measured is the speed at top dead center.
Claim 8
Dependent Claim
36 words
A fuel injection system as set forth in claim 6 wherein the speed measured at top dead center is the time required to reach top dead center from a predetermined crank angle before top dead center.
Claim 9
Dependent Claim
23 words
A fuel injection system as set forth in claim 7 wherein the fuel injection means comprises an individual fuel injector for each cylinder.
Claim 10
Dependent Claim
26 words
A fuel injection system as set forth in claim 8 wherein the amount of fuel injected by the fuel injectors is adjusted to minimize speed variations.
Claim 11
Dependent Claim
24 words
A fuel injection system as set forth in claim 9 wherein the amount of fuel injected is varied by changing the duration of injection.
Claim 12
Dependent Claim
25 words
A fuel injection system as set forth in claim 1 wherein the rotational speed measured is measured at bottom dead center of the individual cylinders.
Claim 13
Dependent Claim
36 words
A fuel injection system as set forth in claim 11 wherein the bottom dead center speed is measured by determining the time to reach bottom dead center from a predetermined crank angle before bottom dead center.
Claim 14
Dependent Claim
23 words
A fuel injection system as set forth in claim 12 wherein the fuel injection means comprises an individual fuel injector for each cylinder.
Claim 15
Dependent Claim
26 words
A fuel injection system as set forth in claim 13 wherein the amount of fuel injected by the fuel injectors is adjusted to minimize speed variations.
Claim 16
Dependent Claim
24 words
A fuel injection system as set forth in claim 14 wherein the amount of fuel injected is varied by changing the duration of injection.
Claim 17
Dependent Claim
20 words
A fuel injection system as set forth in claim 1 wherein the rotational speed measured is the average rotational speed.
Claim 18
Dependent Claim
28 words
A fuel injection system as set forth in claim 16 wherein the average rotational speed is the average speed for each cylinder to travel a predetermined crank angle.
Claim 19
Dependent Claim
23 words
A fuel injection system as set forth in claim 17 wherein the fuel injection means comprises an individual fuel injector for each cylinder.
Claim 20
Dependent Claim
26 words
A fuel injection system as set forth in claim 18 wherein the amount of fuel injected by the fuel injectors is adjusted to minimize speed variations.
Claim 21
Dependent Claim
24 words
A fuel injection system as set forth in claim 19 wherein the amount of fuel injected is varied by changing the duration of injection.
Claim 22
Independent Claim
73 words
A method of operating a fuel injection system for a multi cylinder engine comprising fuel injection means for delivering fuel directly into the cylinders of the engine, comprising the steps of measuring the rotational speed of said engine in timed relation to the firing of each of said cylinders during the running of the engine, and adjusting the fuel injection means for minimizing variations in engine speed due to cylinder to cylinder variations.
Claim 23
Independent Claim
73 words
A method of operating a fuel injection system for a multi cylinder engine comprising fuel injection means for delivering fuel directly into the cylinders of the engine, comprising the steps of measuring the rotational speed of said engine in timed relation to the firing of each of said cylinders during the running of the engine, and adjusting the fuel injection means for minimizing variations in engine speed due to cylinder to cylinder variations.
Claim 24
Dependent Claim
27 words
A method as set forth in claim 21 wherein the engine operates on a diesel cycle and combustion is initiated by the pressure in the combustion chamber.
Claim 25
Dependent Claim
21 words
A method as set forth in claim 21 wherein the fuel injection means comprises an individual fuel injector for each cylinder.
Claim 26
Dependent Claim
24 words
A method as set forth in claim 23 wherein the amount of fuel injected by the fuel injectors is adjusted to minimize speed variations.
Claim 27
Dependent Claim
22 words
A method as set forth in claim 24 wherein the amount of fuel injected is varied by changing the duration of injection.
Claim 28
Dependent Claim
20 words
A method as set forth in claim 21 wherein the rotational speed measured is the speed at top dead center.
Claim 29
Dependent Claim
34 words
A method as set forth in claim 26 wherein the speed measured at top dead center is the time required to reach top dead center from a predetermined crank angle before top dead center.
Claim 30
Dependent Claim
21 words
A method as set forth in claim 27 wherein the fuel injection means comprises an individual fuel injector for each cylinder.
Claim 31
Dependent Claim
24 words
A method as set forth in claim 28 wherein the amount of fuel injected by the fuel injectors is adjusted to minimize speed variations.
Claim 32
Dependent Claim
22 words
A method as set forth in claim 29 wherein the amount of fuel injected is varied by changing the duration of injection.
Claim 33
Dependent Claim
23 words
A method as set forth in claim 21 wherein the rotational speed measured is measured at bottom dead center of the individual cylinders.
Claim 34
Dependent Claim
34 words
A method as set forth in claim 31 wherein the bottom dead center speed is measured by determining the time to reach bottom dead center from a predetermined crank angle before bottom dead center.
Claim 35
Dependent Claim
21 words
A method as set forth in claim 32 wherein the fuel injection means comprises an individual fuel injector for each cylinder.
Claim 36
Dependent Claim
24 words
A method as set forth in claim 33 wherein the amount of fuel injected by the fuel injectors is adjusted to minimize speed variations.
Claim 37
Dependent Claim
22 words
A method as set forth in claim 34 wherein the amount of fuel injected is varied by changing the duration of injection.
Claim 38
Dependent Claim
18 words
A method as set forth in claim 21 wherein the rotational speed measured is the average rotational speed.
Claim 39
Dependent Claim
26 words
A method as set forth in claim 36 wherein the average rotational speed is the average speed for each cylinder to travel a predetermined crank angle.
Claim 40
Dependent Claim
21 words
A method as set forth in claim 37 wherein the fuel injection means comprises an individual fuel injector for each cylinder.
Claim 41
Dependent Claim
24 words
A method as set forth in claim 38 wherein the amount of fuel injected by the fuel injectors is adjusted to minimize speed variations.
Claim 42
Dependent Claim
22 words
A method as set forth in claim 34 wherein the amount of fuel injected is varied by changing the duration of injection.
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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) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |