US4337650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diesel engine start of fuel injection detecting system
Assignee: Motors Liquidation Co
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Filing: 1980-11-21
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Granted: 1982-07-06
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Expires: 2000-11-21
Abstract
Abstract An electrical pressure signal that varies directly in magnitude with changes of fuel line pressure at the fuel injector is raised to a selected mathematical power. This signal is then differentiated to detect the negative rate thereof that occurs at the point of inflection upon the start of fuel injection and a "start of fuel injection" output signal is produced in response to the detection of the point of inflection as indicated by the negative rate.
Inventors
- 👤 Herman F. Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:40
CPC Classifications
F; F02; F02M; F02M65/00; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/401; F02B; F02B3/00; F02B3/06; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0602; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A diesel engine start of fuel injection detecting system that is sensitive to the change of fuel line pressure between the fuel pump and the injector upon the start of fuel injection, comprising: means for producing an electrical pressure signal that varies directly in magnitude with changes of fuel line pressure between the fuel pump and the injector; means for modifying said pressure signal by raising the magnitude thereof to a selected mathematical power; means for producing a first electrical signal when said modified pressure signal reaches a selected value; means for detecting the inflection point of said modified pressure signal upon the start of fuel injection and for producing a second electrical signal upon the detection thereof; and means responsive to said first and second electrical signals for producing an output signal that is indicative of start of fuel injection.
Claim 2
Dependent Claim
141 words
A diesel engine start of fuel injection detecting system that is sensitive to the change of fuel line pressure between the fuel pump and the injector upon the start of fuel injection, comprising: means for producing an electrical pressure signal that varies directly in magnitude with changes of fuel line pressure between the fuel pump and the injector; means for modifying said pressure signal by raising the magnitude thereof to a selected mathematical power; means for producing a first electrical signal when said modified pressure signal reaches a selected value; means for detecting the inflection point of said modified pressure signal upon the start of fuel injection and for producing a second electrical signal upon the detection thereof; and means responsive to said first and second electrical signals for producing an output signal that is indicative of start of fuel injection.
Claim 3
Dependent Claim
162 words
A diesel engine start of fuel injection detecting system that is sensitive to the change of fuel line pressure between the fuel pump and the injector upon the start of fuel injection, comprising: means for producing an electrical pressure signal that varies directly in magnitude with changes of fuel line pressure between the fuel pump and the injector; means for filtering out the high frequency components of said pressure signal; means for modifying said pressure signal by raising the magnitude thereof to a selected mathematical power; means for producing a first electrical signal when said modified pressure signal reaches a selected value; means for detecting the inflection point of said modified pressure signal upon the start of fuel injection; means responsive to said detection of said inflection point of said modified pressure signal for producing a second electrical signal; and means responsive to said first and second electrical signals for producing an output signal that is indicative of start of fuel injection.
Claim 4
Dependent Claim
162 words
A diesel engine start of fuel injection detecting system that is sensitive to the change of fuel line pressure between the fuel pump and the injector upon the start of fuel injection, comprising: means for producing an electrical pressure signal that varies directly in magnitude with changes of fuel line pressure between the fuel pump and the injector; means for filtering out the high frequency components of said pressure signal; means for modifying said pressure signal by raising the magnitude thereof to a selected mathematical power; means for producing a first electrical signal when said modified pressure signal reaches a selected value; means for detecting the inflection point of said modified pressure signal upon the start of fuel injection; means responsive to said detection of said inflection point of said modified pressure signal for producing a second electrical signal; and means responsive to said first and second electrical signals for producing an output signal that is indicative of start of fuel injection.
Claim 5
Dependent Claim
147 words
A diesel engine start of fuel injection detecting system that is sensitive to the change of fuel line pressure between the fuel pump and the injector upon the start of fuel injection, comprising: means for producing an electrical pressure signal that varies directly in magnitude with changes of fuel line pressure between the fuel pump and the injector; means for modifying said pressure signal by raising the magnitude thereof to a selected mathematical power; means for producing a first electrical signal when said modified pressure signal reaches a selected value; means for differentiating said modified pressure signal and for producing a second output signal in response to a selected change of rate thereof at the inflection point thereof upon the start of fuel injection; and means responsive to said first and second electrical signals for producing an output signal that is indicative of start of fuel injection.
Claim 6
Dependent Claim
147 words
A diesel engine start of fuel injection detecting system that is sensitive to the change of fuel line pressure between the fuel pump and the injector upon the start of fuel injection, comprising: means for producing an electrical pressure signal that varies directly in magnitude with changes of fuel line pressure between the fuel pump and the injector; means for modifying said pressure signal by raising the magnitude thereof to a selected mathematical power; means for producing a first electrical signal when said modified pressure signal reaches a selected value; means for differentiating said modified pressure signal and for producing a second output signal in response to a selected change of rate thereof at the inflection point thereof upon the start of fuel injection; and means responsive to said first and second electrical signals for producing an output signal that is indicative of start of fuel injection.
Claim 7
Dependent Claim
171 words
A diesel engine start of fuel injection detecting system that is sensitive to the change of fuel line pressure between the fuel pump and the injector upon the start of fuel injection, comprising: means for producing an electrical pressure signal that varies directly in magnitude with changes of fuel line pressure between the fuel pump and the injector; means for filtering out the high frequency components of said pressure signal; means for modifying said pressure signal by raising the magnitude thereof to a selected mathematical power; means for producing a first electrical signal when said modified pressure signal reaches a selected value; means for differentiating said modified pressure signal for producing a selected change of rate thereof at the inflection point thereof upon the start of fuel injection; means responsive to said selected change of rate of said differentiated modified pressure signal for producing a second electrical signal; and means responsive to said first and second electrical signals for producing an output signal that is indicative of start of fuel injection.
Claim 8
Dependent Claim
171 words
A diesel engine start of fuel injection detecting system that is sensitive to the change of fuel line pressure between the fuel pump and the injector upon the start of fuel injection, comprising: means for producing an electrical pressure signal that varies directly in magnitude with changes of fuel line pressure between the fuel pump and the injector; means for filtering out the high frequency components of said pressure signal; means for modifying said pressure signal by raising the magnitude thereof to a selected mathematical power; means for producing a first electrical signal when said modified pressure signal reaches a selected value; means for differentiating said modified pressure signal for producing a selected change of rate thereof at the inflection point thereof upon the start of fuel injection; means responsive to said selected change of rate of said differentiated modified pressure signal for producing a second electrical signal; and means responsive to said first and second electrical signals for producing an output signal that is indicative of start of fuel injection.
References Cited (Backward Citations)
US3731527A
Cited
US4266427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |