US6318085B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ambient air-pulsed valve control
Assignee: Robert Bosch GmbH
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Filing: 1997-11-28
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Granted: 2001-11-20
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Expires: 2017-11-28
Abstract
Abstract In the apparatus for controlling a coasting air recirculation valve of the turbocharger of an internal combustion engine, the coasting air recirculation valve is arranged in the coasting air recirculation line bypassing a compressor in the intake duct, and the coasting air recirculation valve is controllable by way of the intake duct pressure on the downstream side of the throttle valve. In order to ensure defined opening and closing of the coasting air recirculation valve, an additional control pressure, with which the coasting air recirculation valve can be opened independently of the intake duct pressure, can be delivered to the coasting air recirculation valve.
Inventors
- 👤 Oskar Torno
- 👤 Carsten Kluth
- 👤 Werner Häming
- 👤 Iwan Surjadi
- 👤 Steffen Franke
- 👤 Michael Bäuerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/12; F02B37/16; F02D; F02D33/00; F02D33/02; F02B33/00; F02B33/44; F02B33/446; F02D41/00; F02D41/0002; F02D41/0007; F02B37/18; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
An apparatus for controlling a coasting air recirculation valve of a turbocharger of an internal combustion engine, the coasting air recirculation valve being arranged in a coasting air recirculation line of the internal combustion engine, the coasting air recirculation line bypassing a compressor which is disposed in an intake duct, the apparatus comprising: a negative pressure vessel arrangement; and an electrically controllable solenoid valve delivering, as a function of a control signal, a particular pressure to the coasting air recirculation valve in order to open the coasting air recirculation valve, at least two sources of the particular pressure being available, the particular pressure being one of an intake duct pressure applied on a downstream side of a throttle valve and a control pressure from the negative pressure vessel arrangement, the control pressure being independent of the intake duct pressure.
Claim 2
Independent Claim
139 words
An apparatus for controlling a coasting air recirculation valve of a turbocharger of an internal combustion engine, the coasting air recirculation valve being arranged in a coasting air recirculation line of the internal combustion engine, the coasting air recirculation line bypassing a compressor which is disposed in an intake duct, the apparatus comprising: a negative pressure vessel arrangement; and an electrically controllable solenoid valve delivering, as a function of a control signal, a particular pressure to the coasting air recirculation valve in order to open the coasting air recirculation valve, at least two sources of the particular pressure being available, the particular pressure being one of an intake duct pressure applied on a downstream side of a throttle valve and a control pressure from the negative pressure vessel arrangement, the control pressure being independent of the intake duct pressure.
Claim 3
Dependent Claim
81 words
The apparatus according to claim 1 , further comprising: an arrangement measuring an actual boost pressure on the downstream side of the throttle valve and determining a load gradient from a difference between the actual boost pressure and a reference boost pressure, wherein, if the arrangement determines that the load gradient exceeds a predetermined threshold which is dependent on the reference boost pressure, the arrangement generates the control signal which activates the solenoid valve to open the coasting air recirculation valve.
Claim 4
Dependent Claim
42 words
The apparatus according to claim 2 , wherein the arrangement superimposes a predictive value on the load gradient if a present load gradient rises to a predetermined value with respect to a particular load gradient which existed in a previous timing cycle.
Claim 5
Dependent Claim
42 words
The apparatus according to claim 3 , wherein the arrangement generates the predictive value by determining a difference between a present load gradient and the particular load gradient, and wherein the predictive value is limited to be within a predetermined time interval.
Claim 6
Dependent Claim
50 words
The apparatus according to claim 1 , further comprising: an arrangement providing the control signal which activates the solenoid valve if a ratio between the intake duct pressure and an ambient pressure is below a predetermined threshold, the arrangement providing the control signal for opening the coasting air recirculation valve.
Claim 7
Dependent Claim
24 words
The apparatus according to claim 5 , wherein, after the arrangement activates the solenoid valve, the arrangement deactivates the solenoid valve with a hysteresis.
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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) | 2004-11-19 | 2005-05-21 | 2005-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-11-19 | 2009-05-21 | 2009-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-11-19 | 2013-05-21 | 2013-11-20 | $7700.00 | Window Closed / Lapsed |