Patent US4885935A successfully refreshed from Google Patents.
US4885935A
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US
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Engine testing system
Assignee: Visteon Global Technologies Inc
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Filing: 1988-06-27
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Granted: 1989-12-12
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Expires: 2008-06-27
Abstract
Abstract An engine testing system tests an engine at the end of a production line by controlling the fuel charge and ignition spark timing of an operating engine as a function of engine speed and air charge. The test is accomplished without the need for mass air flow and manifold absolute pressure sensors.
Inventors
- 👤 Roger K. Feller
- 👤 Samuel R. Warner
- 👤 Janice D. Capriotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:41
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/042; F; F02; F02D; F02D41/00; F02D41/24; F02D41/2406; F02D41/30; F02D41/32; F02P; F02P17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
A method for controlling engine operation during end of production line engine testing including the steps of: determining the air charge of the engine by sensing engine speed and by sensing the throttle angle of the engine; determining a desired engine operating parameter as a function of engine speed and air charge of the engine; operating the engine as a function of the determined desired engine operating parameter; determining if the engine coolant temperature is greater than a predetermined value; establishing the engine is operating at idle state by determining if the engine is operating at a steady state and determining if the throttle angle of the engine is stable, at closed throttle, and if the engine speed is stable; and initiating self test of the engine by; determining if engine coolant temperature is within a predetermined temperature range; determining if engine coolant temperature is above a predetermined temperature magnitude; determining if throttle angle magnitude is within a predetermined range; determining if engine idle speed is greater than a predetermined magnitude; and determining if the duty cycle of a signal applied to an engine idle speed control valve is above a predetermined value.
Claim 2
Independent Claim
193 words
A method for controlling engine operation during end of production line engine testing including the steps of: determining the air charge of the engine by sensing engine speed and by sensing the throttle angle of the engine; determining a desired engine operating parameter as a function of engine speed and air charge of the engine; operating the engine as a function of the determined desired engine operating parameter; determining if the engine coolant temperature is greater than a predetermined value; establishing the engine is operating at idle state by determining if the engine is operating at a steady state and determining if the throttle angle of the engine is stable, at closed throttle, and if the engine speed is stable; and initiating self test of the engine by; determining if engine coolant temperature is within a predetermined temperature range; determining if engine coolant temperature is above a predetermined temperature magnitude; determining if throttle angle magnitude is within a predetermined range; determining if engine idle speed is greater than a predetermined magnitude; and determining if the duty cycle of a signal applied to an engine idle speed control valve is above a predetermined value.
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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) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |