US5088286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for turbocharger with rotary electric machine
Assignee: Isuzu Motors Ltd
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Filing: 1990-09-28
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Granted: 1992-02-18
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Expires: 2010-09-28
Abstract
Abstract A control system controls a turbocharger which incorporates a rotary electric machine operable as a motor or a generator. When the rotary electric machine operates as a motor using supplied electric power, the control system controls the amount by which the electric power is to be reduced or increased, depending on the rate of change of the rotational speed of the turbocharger within a speed control range for the turbocharger, thereby reducing the degree by which the rotational speed of the turbocharger varies.
Inventors
- 👤 Hiroshi Muraji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:21
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/04; F02B37/10; F02B37/12; F02B37/14; F02B39/00; F02B39/02; F02B39/08; F02B39/10; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
259 words
A control system for controlling a turbocharger of an internal combustion engine in a motor vehicle, the turbocharger having a rotatable shaft on which a rotary electric machine is mounted and the turbocharger being energized with supplied electric power to rotate the turbocharger to control the amount of supercharged intake air to be supplied to the engine, said control system comprising: an accelerator pedal movement sensor for detecting an amount of depression of an accelerator pedal which controls an amount of fuel to be supplied to the engine, said accelerator pedal movement sensor producing an acceleration signal; means for determining whether the amount of depression of the accelerator pedal is maximum based on the acceleration signal; means for supplying electric power to the rotary electric machine if the amount of depression of the accelerator pedal is determined as being maximum; a rotation sensor for detecting a rotational speed of the turbocharger and producing a rotation signal; means for calculating a rate of change of the rotational speed of the turbocharger, based on the rotation signal from said rotation sensor; means for calculating a power change amount by which the electric power to be supplied to the rotary electric machine is to be reduced or increased, depending on the rate of change of the rotational speed; means for setting a speed control range for the turbocharger; and means for controlling the electric power to be supplied to the rotary electric machine based on said power change amount when the rotational speed of the turbocharger is in said speed control range.
Claim 2
Dependent Claim
259 words
A control system for controlling a turbocharger of an internal combustion engine in a motor vehicle, the turbocharger having a rotatable shaft on which a rotary electric machine is mounted and the turbocharger being energized with supplied electric power to rotate the turbocharger to control the amount of supercharged intake air to be supplied to the engine, said control system comprising: an accelerator pedal movement sensor for detecting an amount of depression of an accelerator pedal which controls an amount of fuel to be supplied to the engine, said accelerator pedal movement sensor producing an acceleration signal; means for determining whether the amount of depression of the accelerator pedal is maximum based on the acceleration signal; means for supplying electric power to the rotary electric machine if the amount of depression of the accelerator pedal is determined as being maximum; a rotation sensor for detecting a rotational speed of the turbocharger and producing a rotation signal; means for calculating a rate of change of the rotational speed of the turbocharger, based on the rotation signal from said rotation sensor; means for calculating a power change amount by which the electric power to be supplied to the rotary electric machine is to be reduced or increased, depending on the rate of change of the rotational speed; means for setting a speed control range for the turbocharger; and means for controlling the electric power to be supplied to the rotary electric machine based on said power change amount when the rotational speed of the turbocharger is in said speed control range.
Claim 3
Dependent Claim
45 words
A control system according to claim 1, wherein said means for supplying electric power to the rotary electric machine comprises means for supplying maximum electric power to the rotary electric machine when the rotational speed of the turbocharger has not reached said speed control range.
Claim 4
Dependent Claim
47 words
A control system according to claim 1, wherein said means for supplying electric power to the rotary electric machine comprises means for cutting off the supply of electric power to the rotary electric machine when the rotational speed of the turbocharger has exceeded said speed control range.
Claim 5
Dependent Claim
73 words
A turbocharger control system for controlling a turbocharger to supply air to an engine having an accelerator, comprising: power supply means for supplying power to the turbocharger; a rotation sensor detecting the rotational speed of the turbocharger; calculation means for calculating a rate of change of said rotational speed; and control means for varying the power supplied by said power supply means corresponding to the rate of change calculated by said calculation means.
Claim 6
Dependent Claim
73 words
A turbocharger control system for controlling a turbocharger to supply air to an engine having an accelerator, comprising: power supply means for supplying power to the turbocharger; a rotation sensor detecting the rotational speed of the turbocharger; calculation means for calculating a rate of change of said rotational speed; and control means for varying the power supplied by said power supply means corresponding to the rate of change calculated by said calculation means.
Claim 7
Dependent Claim
33 words
A turbocharger control system according to claim 4, further comprising: an accelerator sensor detecting whether the accelerator is fully depressed; and said power supply means supplying power only when the acceleration is maximized.
Claim 8
Dependent Claim
24 words
A turbocharger control system according to claim 4, wherein said power supply means supplies no power when said rotational speed exceeds a maximum amount.
Claim 9
Dependent Claim
47 words
A turbocharger control system according to claim 4, wherein said power supply means supplies maximum power when said rotational; speed does not reach a minimum amount, and varies said power supply means corresponding to the rate of change when said rotational speed falls below the minimum amount.
Claim 10
Independent Claim
51 words
A method of controlling a turbocharger supplying air to an engine, comprising the steps of: (a) detecting a rotational speed of the turbocharger; (b) calculating a rate of change of the rotational speed; and (c) supplying power to the turbocharger varying based on the rate of change of the rotational speed.
Claim 11
Independent Claim
51 words
A method of controlling a turbocharger supplying air to an engine, comprising the steps of: (a) detecting a rotational speed of the turbocharger; (b) calculating a rate of change of the rotational speed; and (c) supplying power to the turbocharger varying based on the rate of change of the rotational speed.
Claim 12
Dependent Claim
71 words
A method according to claim 8, further comprising the steps of: (d) supplying no power to the turbocharger when the rotational speed exceeds a maximum amount; (e) supplying maximum power to the turbocharger when the rotational speed continues to fall below a minimum amount; and (f) supplying power to the turbocharger varying based on the rate of change of the rational speed when the rotational speed falls below the minimum amount.
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) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |