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US4334427A
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US
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Testing the condition of a turbocharger
Assignee: RCA Corp
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Filing: 1980-10-20
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Granted: 1982-06-15
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Expires: 2000-10-20
Abstract
Abstract The method of testing the condition of a turbocharger in a turbocharged internal combustion engine by the steps of allowing the engine to decelerate from a high idle speed to a low idle speed, measuring the speed of the turbocharger shaft as the engine decelerates, determining the slope of the D/N vs. N characteristic, where N is the turbocharger shaft speed and D/N is the absolute value of the turbocharger acceleration divided by turbocharger shaft speed, and comparing the computed slope with a predetermined nearly zero slope of a normal turbocharger to see whether the turbocharger is bad due to excessive sliding friction.
Inventors
- 👤 Lee R. Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:08
CPC Classifications
G; G01; G01M; G01M13/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
The method of testing the condition of a turbocharger in a turbocharged internal combustion engine, comprising the steps of: operating the engine at a high idle speed, shutting off the fuel to the engine and allowing the engine and turbocharger to decelerate, measuring the speed of the turbocharger as it decelerates, determining the D/N vs. N characteristic, where N is the turbocharger shaft speed and D/N is the absolute value of the turbocharger deceleration divided by turbocharger shaft speed, and comparing the slope of the D/N vs. N characteristic with a nearly zero slope of a normal turbocharger to see whether there is an excessive slope due to sliding friction in the turbocharger.
Claim 2
Independent Claim
113 words
The method of testing the condition of a turbocharger in a turbocharged internal combustion engine, comprising the steps of: operating the engine at a high idle speed, shutting off the fuel to the engine and allowing the engine and turbocharger to decelerate, measuring the speed of the turbocharger as it decelerates, determining the D/N vs. N characteristic, where N is the turbocharger shaft speed and D/N is the absolute value of the turbocharger deceleration divided by turbocharger shaft speed, and comparing the slope of the D/N vs. N characteristic with a nearly zero slope of a normal turbocharger to see whether there is an excessive slope due to sliding friction in the turbocharger.
Claim 3
Independent Claim
112 words
The method of testing the condition of a turbocharger in a turbocharged internal combustion engine, comprising the steps of: operating the engine at a high idle speed, shutting off the fuel to the engine and allowing the engine and turbocharger to decelerate, measuring the speed of the turbocharger as it decelerates, determining the slope of the D/N vs N characteristic, where N is the turbocharger shaft speed and D/N is the absolute value of the turbocharger deceleration divided by turbocharger shaft speed, and comparing said computed slope with a predetermined nearly zero slope of a normal turbocharger to see whether there is an excessive slope due to sliding friction in the turbocharger.
Claim 4
Independent Claim
112 words
The method of testing the condition of a turbocharger in a turbocharged internal combustion engine, comprising the steps of: operating the engine at a high idle speed, shutting off the fuel to the engine and allowing the engine and turbocharger to decelerate, measuring the speed of the turbocharger as it decelerates, determining the slope of the D/N vs N characteristic, where N is the turbocharger shaft speed and D/N is the absolute value of the turbocharger deceleration divided by turbocharger shaft speed, and comparing said computed slope with a predetermined nearly zero slope of a normal turbocharger to see whether there is an excessive slope due to sliding friction in the turbocharger.
References Cited (Backward Citations)
US4046003A
Cited
US4277830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |