US4998951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbocharger control system
Assignee: Isuzu Ceramics Research Institute Co Ltd
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Filing: 1989-08-07
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Granted: 1991-03-12
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Expires: 2009-08-07
Abstract
Abstract A turbocharger control system includes an on-off valve disposed in an engine-side end of a passage interconnecting a turbocharger and an engine. When the accelerator pedal is released while the engine is in operation, the on-off valve is closed to store air under pressure in the passage. When the engine is accelerated again, the on-off valve is opened to supply the stored air to the engine, thus supercharging the engine. Therefore, any turbocharger time lag produced when the engine is accelerated again can be reduced. If the pressure of intake air stored in the passage is not increased, a motor mounted on the rotatable shaft of the turbocharger is energized to assist in rotating the turbocharger.
Inventors
- 👤 Hideo Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:33
CPC Classifications
F; F02; F02B; F02B39/00; F02B39/02; F02B39/08; F02B39/10; F02B21/00; F02B33/00; F02B33/44; F02B33/446; F02B37/00; F02B37/04; F02B37/10; F02B37/12; F02B37/14; F02B37/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
A system for controlling a turbocharger associated with an internal combustion engine, comprising: a passage interconnecting an air outlet of the turbocharger and an air inlet of the engine; opening and closing means, disposed in an end of the passage which is connected to said air inlet, for selectively opening and closing said end of the passage; detecting means for detecting the amount of depression of an accelerator pedal which controls the output power of the engine; and control means for controlling said opening and closing means to close said passage end to store intake air in said passage, when the amount of depression of said accelerator pedal is reduced at a speed higher than a predetermined speed as detected by a signal from said detecting means, and for controlling said opening and closing means to open said passage end to release the stored intake air and supply the stored intake air to the engine, when the amount of depression of said accelerator pedal is increased.
Claim 2
Independent Claim
166 words
A system for controlling a turbocharger associated with an internal combustion engine, comprising: a passage interconnecting an air outlet of the turbocharger and an air inlet of the engine; opening and closing means, disposed in an end of the passage which is connected to said air inlet, for selectively opening and closing said end of the passage; detecting means for detecting the amount of depression of an accelerator pedal which controls the output power of the engine; and control means for controlling said opening and closing means to close said passage end to store intake air in said passage, when the amount of depression of said accelerator pedal is reduced at a speed higher than a predetermined speed as detected by a signal from said detecting means, and for controlling said opening and closing means to open said passage end to release the stored intake air and supply the stored intake air to the engine, when the amount of depression of said accelerator pedal is increased.
Claim 3
Dependent Claim
37 words
A system according to claim 1, further comprising means for increasing the amount of opening of said passage end provided by said opening and closing means as the amount of depression of the accelerator pedal is increased.
Claim 4
Dependent Claim
57 words
A system according to claim 2, further comprising detecting means for detecting the pressure of the intake air stored in said passage, and means for increasing the amount of opening of said passage end provided by said opening and closing means as the pressure of the stored intake air, as detected by said detecting means, is reduced.
Claim 5
Dependent Claim
47 words
A system according to claim 3, further comprising a rotary electric machine mounted on a rotatable shaft of the turbocharger, and means for operating said rotary electric machine as an electric motor, when the detected pressure of the stored intake air is lower than a predetermined pressure.
Claim 6
Dependent Claim
47 words
A system according to claim 1, further comprising opening means for venting the air inlet of the engine to atmosphere, and means for actuating said opening means to vent the air inlet to atmosphere, only when said passage end is closed by said opening and closing means.
Claim 7
Dependent Claim
33 words
A system according to claim 5, further comprising a reed valve disposed between the air outlet of the turbocharger and said passage for feeding intake air from the turbocharger only toward said passage.
Claim 8
Dependent Claim
14 words
A system according to claim 6, further comprising an accumulator connected to said passage.
Claim 9
Dependent Claim
48 words
A system according to claim 4, further comprising an opening means for venting the air inlet of the engine to atmosphere, and means for actuating said opening means to vent the air inlet to atmosphere, only when said passage end is closed by said opening and closing means.
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) | 1994-03-11 | 1994-09-10 | 1995-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-11 | 1998-09-10 | 1999-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-11 | 2002-09-10 | 2003-03-12 | $7700.00 | Window Closed / Lapsed |