US3677075A
Expired / Lapsed
US
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Method for the detection and classification of defects in internal combustion engines
Assignee: United States Department of the Army
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Filing: 1970-10-20
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Granted: 1972-07-18
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Expires: 1990-10-20
Abstract
Abstract The present invention relates to a method for detecting and classifying cylinder defects in internal combustion engines, and more specifically to a method for classifying such defects into a) fuel system and b) compression defects.
Inventors
- 👤 William Kenneth Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:40
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/042; G01M15/046; F; F02; F02D; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1015
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A method for detecting cylinder defects in an internal combustion engine and classifying them into fuel system and compression defects comprising the steps of: a. measuring the cyclic torque variation of said internal combustion engine in the operating mode; b. measuring the cyclic torque variation of said internal combustion engine in the driven mode; and c. comparing the results of said two measuring steps to determine whether the cause of a defect detected thereby is related to: a fuel system problem in said internal combustion engine, in which case said defect will occur only during the measurement of step a; or is a compression problem therein, in which case said defect will appear in The measurements of step b.
Claim 2
Independent Claim
119 words
A method for detecting cylinder defects in an internal combustion engine and classifying them into fuel system and compression defects comprising the steps of: a. measuring the cyclic torque variation of said internal combustion engine in the operating mode; b. measuring the cyclic torque variation of said internal combustion engine in the driven mode; and c. comparing the results of said two measuring steps to determine whether the cause of a defect detected thereby is related to: a fuel system problem in said internal combustion engine, in which case said defect will occur only during the measurement of step a; or is a compression problem therein, in which case said defect will appear in The measurements of step b.
Claim 3
Dependent Claim
63 words
The method as described in claim 1 wherein said measuring of the cyclic torque variation of steps a and b is accomplished by using a tachometer sensor comprising: a. a tachometer adapter coupling designed to couple to said tachometer output connection of said internal combustion engine; b. a permanent mounting of said tachometer (alternator, generator or other pickup device) for measuring cyclic torque.
Claim 4
Dependent Claim
41 words
The method as described in claim 1 wherein said engine in step a measures cyclic torque and is used to provide a calibrated measure of the power output capability of said internal combustion engine through both positive and negative going changes.
Claim 5
Dependent Claim
22 words
The method as described in claim 3 wherein the cylinder of said internal combustion engine delivering substandard power is identified and evaluated.
Claim 6
Dependent Claim
48 words
The method for detecting cylinder defects in an internal combustion engine and classifying them into fuel system and compression defects comprising the steps of claim 4 wherein relative performance of different types of fuel injections, piston rings, valves, valve setting and cylinder head geometry are identified and evaluated.
Claim 7
Dependent Claim
51 words
The method for detecting cylinder defects in an internal combustion engine and classifying them into fuel system and compression defects comprising the steps of claim 5 wherein said method is for measuring a balance of power and determines the total calibrated measure which may be referenced for a family of engines.
Claim 8
Dependent Claim
27 words
The method of claim 1 and the additional step of indicating that they do occur simultaneously when fuel systems and compression defects occur at the same time.
References Cited (Backward Citations)
US2675701A
Cited
US3421367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |