Patent US4841765A successfully refreshed from Google Patents.
US4841765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of locating a partially plugged port fuel injector using misfire monitor
Assignee: Individual
•
Filing: 1988-01-21
•
Granted: 1989-06-27
•
Expires: 2008-01-21
Abstract
Abstract A method of locating a partially plugged port fuel injector in an internal combustion engine using a misfire monitor is disclosed. In the preferred embodiment, the misfire monitor includes an oxygen analyzer for determining that the lean-roll frequency of the engine has decreased or ceased when the partially plugged fuel injector is disabled or when the cylinders associated with the partially plugged fuel injector are disabled.
Inventors
- 👤 John D. Blanke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:10
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1473; F02D41/1474; F02D41/1497; F02D41/1498; G; G01; G01M; G01M15/00; G01M15/04; G01M15/10; G01M15/102; G01M15/104; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1015
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
The method of locating a partially plugged port fuel injector in an internal combustion engine comprising using a misfire monitor to determine that the lean-roll frequency of the engine has decreased or ceased after the partially plugged port fuel injector is intentionally disabled.
Claim 2
Independent Claim
43 words
The method of locating a partially plugged port fuel injector in an internal combustion engine comprising using a misfire monitor to determine that the lean-roll frequency of the engine has decreased or ceased after the partially plugged port fuel injector is intentionally disabled.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein said misfire monitor includes an oxygen analyzer which signals that a lean-roll condition has occurred.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the fuel injector is disabled by interrupting the electrical current supplied to the fuel injector.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the fuel injector is disabled by interrupting the supply of fuel to the fuel injector.
Claim 6
Independent Claim
97 words
The method of using a misfire monitor to locate a partially plugged port fuel injector in an internal combustion engine comprising the steps of: a. sampling the exhaust gases from the engine to determine that a lean-roll condition exists; b. disabling one fuel injector; c. sampling the exhaust gases from the engine to determine the lean-roll frequency of the engine; d. noting the location of the disabled fuel injector if the lean-roll frequency of the engine has decreased or ceased; e. reenabling the disabled fuel injector; f. repeating steps (b) through (e) for each remaining fuel injector.
Claim 7
Independent Claim
97 words
The method of using a misfire monitor to locate a partially plugged port fuel injector in an internal combustion engine comprising the steps of: a. sampling the exhaust gases from the engine to determine that a lean-roll condition exists; b. disabling one fuel injector; c. sampling the exhaust gases from the engine to determine the lean-roll frequency of the engine; d. noting the location of the disabled fuel injector if the lean-roll frequency of the engine has decreased or ceased; e. reenabling the disabled fuel injector; f. repeating steps (b) through (e) for each remaining fuel injector.
Claim 8
Dependent Claim
21 words
The method of claim 5 wherein the misfire monitor includes an oxygen analyzer which signals that a lean-roll condition has occurred.
Claim 9
Dependent Claim
23 words
The method of claim 5 wherein said one fuel injector is disabled by interrupting the electrical current supplied to said one fuel injector.
Claim 10
Dependent Claim
23 words
The method of claim 5 wherein said one fuel injector is disabled by interrupting the supply of fuel to said one fuel injector.
Claim 11
Independent Claim
43 words
The method of locating a partially plugged port fuel injector in an internal combustion engine comprising using a misfire monitor to determine that the lean-roll frequency has decreased or ceased after the cylinder associated with the partially plugged port fuel injector is disabled.
Claim 12
Independent Claim
43 words
The method of locating a partially plugged port fuel injector in an internal combustion engine comprising using a misfire monitor to determine that the lean-roll frequency has decreased or ceased after the cylinder associated with the partially plugged port fuel injector is disabled.
Claim 13
Dependent Claim
37 words
The method of claim 9 wherein each one of a plurality of cylinders includes an associated spark plug, and each one of said cylinders is disabled by interrupting the electrical current to its associated said spark plug.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |