EP1532353B1
Expired / Lapsed
EP
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A method and a device for cleaning of crankcase gas
Assignee: Alfa Laval Corporate AB
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Filing: 2003-06-17
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Granted: 2009-11-11
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Expires: 2023-06-17
Abstract
Abstract Upon cleaning of crankcase gas generated during operation of an internal combustion engine in its crankcase, a centrifugal separator is used, which includes a rotor arranged for rotation by means of a driving motor and arranged by its rotation suck crankcase gas from the crankcase through a conduit to the centrifugal separator. During operation of the combustion engine a parameter, e.g. a measurement of the load on the combustion engine is sensed, the magnitude of said parameter being related to the amount of crankcase gas generated per unit of time in the crankcase. Depending upon a sensed change of the sensed parameter the rotational speed of the rotor of the centrifugal separator is changed in a way such that the gas pressure in the crankcase is maintained at a predetermined value, or within a predetermined pressure interval, during the operation of the combustion engine.
Inventors
- 👤 Mats Ekeroth
- 👤 Claes-Göran Carlsson
- 👤 Rolf Ridderstrale
- 👤 Jan Skoog
- 👤 Göran Ström
- 👤 Claes Wase
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 16:30
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/04; B; B01; B01D; B01D45/00; B01D45/12; B01D45/14; B04; B04B; B04B5/00; B04B5/08; B04B5/12; B04B9/00; B04B9/10; F01M11/00; F01M11/10; B04B2005/125; F01M2013/0005; F01M2013/0422; Y; Y10; Y10S; Y10S55/00; Y10S55/19
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
A method of cleaning crankcase gas generated during operation of an internal combustion engine (31; 41) in its crankcase, characterized by - use of a centrifugal separator (34; 50) that includes a centrifugal rotor (8) arranged for rotation by means of a driving motor (9; 49) and arranged by its rotation to suck crankcase gas from the crankcase to the centrifugal separator (34; 50), - sensing of a parameter, the magnitude of which is related to the amount of crankcase gas generated per unit of time in the crankcase, and - changing of the rotational speed of the centrifugal rotor (8) in response to a sensed change of said parameter in a way such that the gas pressure in the crankcase is maintained at a predetermined value, or within a predetermined pressure interval, during the operation of the combustion engine (31; 41).
Claim 2
Dependent Claim
30 words
A method according to claim 1, in which the rotational speed of the centrifugal rotor (8) is changed from a first value to a second value, both larger than nil.
Claim 3
Dependent Claim
24 words
A method according to claim 1, in which the rotational speed of the centrifugal rotor (8) is changed stepwise in more than two steps.
Claim 4
Dependent Claim
19 words
A method according to claim 1, in which the rotational speed of the centrifugal rotor (8) is changed continuously.
Claim 5
Independent Claim
52 words
A method according to any one of the preceding claims, in which the rotational speed of the centrifugal rotor (8) is changed in response to a sensed change of a flow of crankcase gas, that is generated as a consequence of the production of crankcase gas by the combustion engine (31; 41).
Claim 6
Independent Claim
54 words
A method according to any one of the claims 1-4, in which the rotational speed of the centrifugal rotor (8) is changed in response to a sensed change of an over pressure of the crankcase gas, which comes up as a consequence of the production of crankcase gas by the combustion engine (31; 41).
Claim 7
Independent Claim
28 words
A method according to any one of the preceding claims, in which sensing is made of a parameter varying with the load on the combustion engine (31; 41).
Claim 8
Independent Claim
54 words
A method according to any one of the preceding claims, in which an electric driving motor (49) is used for the rotation of the centrifugal rotor (8) and a frequency converter (48) is used for changing of the rotational speed of the driving motor (49) and, thereby, the speed of the centrifugal rotor (8).
Claim 9
Independent Claim
190 words
A device for cleaning of crankcase gas generated during operation of an internal combustion engine (31; 41) in its crankcase, said device including a centrifugal separator (34, 50) having a centrifugal rotor (8) that is arranged for rotation by means of a driving motor (9; 49) and arranged by its rotation to suck crankcase gas from the crankcase to the centrifugal separator, characterized in - that the driving motor (9; 49) is arranged for rotation of the centrifugal rotor (8) at different speeds, - that sensing means (45) is arranged to sense a parameter, the magnitude of which is related to the amount of crankcase gas generated per unit of time in the crankcase, - that said sensing means (45) is operatively connected with the driving motor (8, 49) and - that the driving motor (9; 49) is arranged to change the rotational speed of the centrifugal rotor (8) in response to a sensed change of said parameter in a way such that the gas pressure in the crankcase is maintained at a predetermined value, or within a predetermined pressure interval, during the operation of the combustion engine (31; 41).
Claim 10
Dependent Claim
31 words
A device according to claim 9, in which the driving motor (49) is electric and a frequency converter (48) is connected between the sensing means (45) and the driving motor (49).
Claim 11
Dependent Claim
37 words
A device according to claim 9 or 10, in which the sensing means (45) is arranged to sense a parameter that is related to the load to which the combustion engine (41) is subjected during its operation.
References Cited (Backward Citations)
No citation records indexed.
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