US4781160A
Expired / Lapsed
US
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Method for operating an exhaust-gas-turbocharged, low-compression multi-cylinder diesel-cycle internal combustion engine
Assignee: MAN Truck and Bus SE
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Filing: 1987-10-01
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Granted: 1988-11-01
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Expires: 2007-10-01
Abstract
Abstract A method of operating and exhaust-gas-turbocharged, low-compression multi-cylinder Diesel-cycle internal combustion engine that has a first cylinder group which operates over the full load range, and a second cylinder group which is cut out during starting and in the idling and part load ranges but is cut in in the remaining load range, each cylinder group having associated with it a turbocharger with associated charge air pipe, the charge air pipes being interconnected by a pressure equalizing system. To improve the starting and part load behavior, and/or permit good acceleration behavior from the lower idle to rated output (to reduce emission of noxious substances in the exhaust gas), pressure equalization between the two charge air pipes is interrupted during the cylinder cutout mode - during starting as well as in the lower load and speed ranges - and is restored in the upper load range by a load-responsive device, and at the same time the intake air for the firing cylinders is preheated during the cylinder cutout mode by means known per se.
Inventors
- 👤 Joachim Lohr
- 👤 Volker Rasch
- 👤 Walter Gotre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:42
CPC Classifications
F; F02; F02N; F02N19/00; F02N19/02; F02N19/04; F02N19/06; F02B; F02B29/00; F02B29/04; F02B29/0406; F02B29/0412; F02B33/00; F02B33/44; F02B33/443; F02B37/00; F02D; F02D17/00; F02D17/02; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06; F02B75/00; F02B75/16; F02B75/18; F02B75/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
In a method of operating an exhaust-gas-turbocharged, low-compression, multi-cylinder Diesel-cycle internal combustion engine that has a first cylinder group which operates over the full load range, and a second cylinder group which is cut out during starting and in the idling and part load ranges, but is cut in in the remaining load range, with cutting out and cutting in of the second cylinder group being effected by respectively cutting off or cutting in the fuel supply, each cylinder group having associated with it an exhaust-gas-operated turbocharger with an associated charge air pipe, the latter communicating with one another via a so-called pressure equalization system, the improvement comprising the steps of: in the cylinder cutout mode, i.e. during starting as well as in the lower load and speed ranges, interrupting pressure equalization between the two charge air pipes: in the upper load range, restoring pressure equalization via a load-controlled device; and during cylinder cutout, preheating the intake air for the firing cylinders.
Claim 2
Dependent Claim
162 words
In a method of operating an exhaust-gas-turbocharged, low-compression, multi-cylinder Diesel-cycle internal combustion engine that has a first cylinder group which operates over the full load range, and a second cylinder group which is cut out during starting and in the idling and part load ranges, but is cut in in the remaining load range, with cutting out and cutting in of the second cylinder group being effected by respectively cutting off or cutting in the fuel supply, each cylinder group having associated with it an exhaust-gas-operated turbocharger with an associated charge air pipe, the latter communicating with one another via a so-called pressure equalization system, the improvement comprising the steps of: in the cylinder cutout mode, i.e. during starting as well as in the lower load and speed ranges, interrupting pressure equalization between the two charge air pipes: in the upper load range, restoring pressure equalization via a load-controlled device; and during cylinder cutout, preheating the intake air for the firing cylinders.
Claim 3
Dependent Claim
20 words
A method according to claim 1, in which said preheating step comprises preheating said intake air with Diesel-fuel-operated glow plugs.
Claim 4
Dependent Claim
21 words
A method according to claim 1, in which said preheating step comprises preheating said intake air with electrically heated glow plugs.
Claim 5
Dependent Claim
36 words
A method according to claim 1, for an internal combustion engine having an intercooler, including the step of interrupting the flow of coolant through said intercooler in the operating mode of cylinder cutout and air preheating.
Claim 6
Dependent Claim
57 words
A method according to claim 4, which includes the steps of providing a simple injection pump with only one control rod, and providing special grooves in the elements of the injection pump to prevent the injection of fuel into the cutout cylinders during cold starting and/or in the unloaded condition, especially under conditions of so-called free acceleration.
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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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |