US5067470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust-gas recycling device for an internal-combustion engine
Assignee: Mercedes Benz Group AG
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Filing: 1990-10-18
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Granted: 1991-11-26
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Expires: 2010-10-18
Abstract
Abstract In an exhaust-gas recycling device for internal-combustion engines, especially diesel engines, in which the exhaust-gas recycling quantity is controlled as a function of the engine running via an exhaust-gas recycling valve mounted in the exhaust-gas recycling line, it is to be possible to regulate the exhaust-gas recycling flow quantity independently of flow resistances changing in the fresh-gas intake and exhaust-gas lines. For this purpose, changes of flow resistance in the fresh-gas intake and exhaust-gas lines are fed as additional pressure control signals to the exhaust-recycling valve. A change of flow resistance in the exhaust-gas line can occur particularly as a result of a soot burn-off filter which is installed there an on which the soot is burnt off at irregular time intervals.
Inventors
- 👤 Detlef Panten
- 👤 Dirk Naber
- 👤 Franz Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:27
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/59; F02M26/61; F02M26/55; F02B; F02B3/00; F02B3/06; F02M2026/001; F02M2026/002; F02M26/13; F02M26/14; F02M26/15; F02M26/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
183 words
Device for controlling the exhaust-gas recycling quantity on an internal-combustion engine, with an exhaust-gas recycling line branched off from an exhaust-gas line to an inlet line and with an exhaust-gas recycling valve arranged in the exhaust-gas recycling line and comprising a valve controlling the connection between the inlet and outlet lines and a pneumatic control drive consisting of two diaphragms which are clamped in a housing and which are connected operatively to a closing part of the valve, at least one diaphragm being connected firmly to the closing part, and the two diaphragms each being loaded by a spring in the closing direction of the closing part, the diaphragms subdividing the housing into at least two control chambers, of which a first control chamber located between the diaphragms can be subjected to a control pressure determined as a function of the engine running and a second control chamber formed by the second diaphragm and the housing can be subjected to a further control pressure, wherein the second control chamber is subjected as a control pressure to the exhaust-gas pressure from the exhaust-gas line.
Claim 2
Dependent Claim
183 words
Device for controlling the exhaust-gas recycling quantity on an internal-combustion engine, with an exhaust-gas recycling line branched off from an exhaust-gas line to an inlet line and with an exhaust-gas recycling valve arranged in the exhaust-gas recycling line and comprising a valve controlling the connection between the inlet and outlet lines and a pneumatic control drive consisting of two diaphragms which are clamped in a housing and which are connected operatively to a closing part of the valve, at least one diaphragm being connected firmly to the closing part, and the two diaphragms each being loaded by a spring in the closing direction of the closing part, the diaphragms subdividing the housing into at least two control chambers, of which a first control chamber located between the diaphragms can be subjected to a control pressure determined as a function of the engine running and a second control chamber formed by the second diaphragm and the housing can be subjected to a further control pressure, wherein the second control chamber is subjected as a control pressure to the exhaust-gas pressure from the exhaust-gas line.
Claim 3
Dependent Claim
110 words
Device for controlling the exhaust-gas recycling quantity according to claim 1, wherein, interposed between the first and second control chambers, is a third control chamber which is separated from the first control chamber by a rigid connecting wall and on which the compression spring of the second diaphragm is supported, wherein the second diaphragm is attached rigidly to the first diaphragm via a driving rod guided displaceably through the connecting wall, wherein a third diaphragm sealing off the lead-in of the driving rod through the connecting wall is arranged in the third control chamber, and wherein the third control chamber is subjected to a control pressure from the inlet line.
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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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |