Patent US5678407A successfully refreshed from Google Patents.
US5678407A
Expired / Lapsed
US
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Control system for motor/generator turbocharger
Assignee: Isuzu Motors Ltd
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Filing: 1995-10-27
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Granted: 1997-10-21
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Expires: 2015-10-27
Abstract
Abstract In a turbocharger equipped with a motor/generator, the motor/generator gradually decreases its generator output without shifting abruptly from generation mode to motor mode when a vehicle starts accelerating during cruising at a constant speed or runs along an upward slope, thus preventing abrupt increases in the loading on an engine. A control system for a motor/generator equipped turbocharger which is disposed across an exhaust conduit of an engine and includes a rotating shaft thereof on which a motor/generator is mounted is provided having a controller for, when the motor/generator is actuated as a motor, feeding the motor/generator with a supply of power from a battery, and when the motor/generator is actuated as a generator, converting an alternating current, high voltage form for charging the battery and also to a three-phase alternating current form for driving as a motor an alternator which is driven as a generator by the engine, an engine revolution sensor, an accelerator opening sensor, and an engine boost pressure sensor. More specifically, the control system comprises a calculating device for calculating a target boost pressure from the engine revolution sensor and the accelerator opening sensor, a first judging device for determining that the action of the engine is an acceleration mode when a difference between the target boost pressure and an actual boost pressure is smaller than a first predetermined value, and a device for decreasing the generator output of the motor/generator when the motor/generator is actuated as the generator during the acceleration mode judged by the first judging device.
Inventors
- 👤 Shinji Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:30
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/005; F02B37/04; F02B37/10; F02B37/12; F02B37/14; F02B39/00; F02B39/02; F02B39/08; F02B39/10; F02B41/00; F02B41/02; F02B41/10; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
241 words
A control system for a motor/generator equipped turbocharger which is disposed across an exhaust conduit of an engine and includes a rotating shaft on which a motor/generator is mounted, having a controller to, when the motor/generator is actuated as a motor, feed the motor/generator with a supply of power from a battery, and when the motor/generator is actuated as a generator, to convert an alternating current, high voltage output of the motor/generator to a direct current, low voltage form to charge the battery and also to a three-phase alternating current form to drive as a motor an alternator which is driven as a generator by the engine, an engine revolution sensor an accelerator opening sensor, and an engine boost pressure sensor, the control system comprising: calculating means for calculating a target boost pressure from the engine revolution sensor and the accelerator opening sensor; first judging means for determining that the action of the engine is an acceleration mode when a difference between the target boost pressure and an actual boost pressure is larger than a first predetermined value; second judging means for determining whether the motor/generator operates as a motor or as a generator from the engine revolution sensor and the accelerating opening sensor; and means for decreasing generator output of the motor/generator when the first judging means judges the action of the engine to be the acceleration mode and the second judging means judges the motor/generator operates as a generator.
Claim 2
Dependent Claim
241 words
A control system for a motor/generator equipped turbocharger which is disposed across an exhaust conduit of an engine and includes a rotating shaft on which a motor/generator is mounted, having a controller to, when the motor/generator is actuated as a motor, feed the motor/generator with a supply of power from a battery, and when the motor/generator is actuated as a generator, to convert an alternating current, high voltage output of the motor/generator to a direct current, low voltage form to charge the battery and also to a three-phase alternating current form to drive as a motor an alternator which is driven as a generator by the engine, an engine revolution sensor an accelerator opening sensor, and an engine boost pressure sensor, the control system comprising: calculating means for calculating a target boost pressure from the engine revolution sensor and the accelerator opening sensor; first judging means for determining that the action of the engine is an acceleration mode when a difference between the target boost pressure and an actual boost pressure is larger than a first predetermined value; second judging means for determining whether the motor/generator operates as a motor or as a generator from the engine revolution sensor and the accelerating opening sensor; and means for decreasing generator output of the motor/generator when the first judging means judges the action of the engine to be the acceleration mode and the second judging means judges the motor/generator operates as a generator.
Claim 3
Dependent Claim
39 words
A control system for a motor/generating equipped turbocharger according to claim 1, further comprising means for actuating the motor/generator as a motor when the boost pressure fails to increase with the generator output of the motor/generator output decreasing means.
Claim 4
Dependent Claim
87 words
A control system for a motor/generator equipped turbocharger according to claim 1, further comprising means for actuating the motor/generator as a motor when the boost pressure fails to increase with the generator output of the motor/generator having been reduced to zero through the action of the generator output decreasing means; and means for driving the alternator as a motor when the boost pressure fails to increase with the generator output of the motor/generator having been reduced to zero through the action of the generator output decreasing means.
Claim 5
Dependent Claim
137 words
A control system for a motor/generator equipped turbocharger disposed in an engine comprising: an engine revolution sensor and an acceleration opening sensor; calculating means for calculating a target boost pressure from the engine revolution sensor and the acceleration opening sensor; first judging means for determining that action of the engine in an acceleration mode when a difference between the target boost pressure and an actual boost pressure is larger than a first predetermined value; second judging means for determining whether the motor/generator operates as a motor or as a generator from the engine revolution sensor and the accelerating opening sensor; and means for decreasing generator output of the motor/generator when the first judging means judges the action of the engine to be the acceleration mode and the second judging means judges the motor/generator operates as a generator.
Claim 6
Dependent Claim
137 words
A control system for a motor/generator equipped turbocharger disposed in an engine comprising: an engine revolution sensor and an acceleration opening sensor; calculating means for calculating a target boost pressure from the engine revolution sensor and the acceleration opening sensor; first judging means for determining that action of the engine in an acceleration mode when a difference between the target boost pressure and an actual boost pressure is larger than a first predetermined value; second judging means for determining whether the motor/generator operates as a motor or as a generator from the engine revolution sensor and the accelerating opening sensor; and means for decreasing generator output of the motor/generator when the first judging means judges the action of the engine to be the acceleration mode and the second judging means judges the motor/generator operates as a generator.
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) | 2000-10-20 | 2001-04-21 | 2001-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-20 | 2005-04-21 | 2005-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-20 | 2009-04-21 | 2009-10-21 | $7700.00 | Window Closed / Lapsed |