US6523345B2
Expired / Lapsed
US
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Control system for a variable-geometry turbocharger
Assignee: FPT Motorenforschung AG
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Filing: 2001-12-28
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Granted: 2003-02-25
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Expires: 2021-12-28
Abstract
Abstract A control system for a variable-geometry turbocharger connected to an internal combustion engine, whereby the geometry of the turbocharger is controlled alternatively according to a first operating mode, a second operating mode or a third operating mode; the system providing for switching from one operating mode to another fully automatically.
Inventors
- 👤 Guenther Scherngell
- 👤 Werner Zaehner
- 👤 Juerg Spuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:59
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0002; F02D41/0007; F02B; F02B37/00; F02B37/12; F02B37/22; F02D41/02; F02D41/14; F02D41/1401; F02D2041/1411; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
264 words
A control system for a variable-geometry turbocharger, wherein an internal combustion engine is connected to a variable-geometry turbocharger ( 4 ); said system being characterized by comprising: a first controller ( 41 ) supplying a first drive signal (P 1 ) for controlling ( 30 ) the geometry of said turbocharger on the basis of at least a first signal pM correlated to flow of the air supplied to the engine ( 3 ) by the compressor ( 6 ) of said turbocharger ( 4 ); a second controller ( 43 ) supplying a second drive signal (P 2 ) for controlling ( 30 ) the geometry of said turbocharger on the basis of a second signal pT correlated to the pressure of the exhaust gas supplied to the turbine ( 10 ) of said turbocharger ( 4 ); a third controller ( 46 ) supplying a third drive signal (P 3 ) for controlling ( 30 ) the geometry of said turbocharger on the basis of a third signal nT correlated to the rotation speed of said turbocharger ( 4 ); said first ( 41 ), said second ( 43 ) and said third ( 46 ) controller providing, in use, for respective first ( 100 ; 100 a ), second ( 200 ; 200 a ) and third ( 300 ; 300 a ) operating modes; said turbocharger being controlled alternatively by at least two of said controllers ( 41 , 43 , 46 ) and control being switched automatically from one controller to another respectively from one operating mode to another.
Claim 2
Dependent Claim
264 words
A control system for a variable-geometry turbocharger, wherein an internal combustion engine is connected to a variable-geometry turbocharger ( 4 ); said system being characterized by comprising: a first controller ( 41 ) supplying a first drive signal (P 1 ) for controlling ( 30 ) the geometry of said turbocharger on the basis of at least a first signal pM correlated to flow of the air supplied to the engine ( 3 ) by the compressor ( 6 ) of said turbocharger ( 4 ); a second controller ( 43 ) supplying a second drive signal (P 2 ) for controlling ( 30 ) the geometry of said turbocharger on the basis of a second signal pT correlated to the pressure of the exhaust gas supplied to the turbine ( 10 ) of said turbocharger ( 4 ); a third controller ( 46 ) supplying a third drive signal (P 3 ) for controlling ( 30 ) the geometry of said turbocharger on the basis of a third signal nT correlated to the rotation speed of said turbocharger ( 4 ); said first ( 41 ), said second ( 43 ) and said third ( 46 ) controller providing, in use, for respective first ( 100 ; 100 a ), second ( 200 ; 200 a ) and third ( 300 ; 300 a ) operating modes; said turbocharger being controlled alternatively by at least two of said controllers ( 41 , 43 , 46 ) and control being switched automatically from one controller to another respectively from one operating mode to another.
Claim 3
Dependent Claim
51 words
A system as claimed in claim 1 , characterized in that the control being switched from one operating mode to another based on explicit switching criteria; said criteria being derivable from operational conditions of said engine and of said turbocharger; said operational conditions being derivable from sensor signals and stored targets.
Claim 4
Dependent Claim
81 words
A system as claimed in claim 1 , characterized in that switching from the first operating mode ( 100 ) to the second operating mode ( 200 ) occurs when at least one of the following conditions is determined: the second signal pT reaches a limit threshold value pTlim and the third signal nT does not exceed a limit value nTlim; and the engine is in a transient state and the third signal nT does not exceed a threshold value nTlim.
Claim 5
Dependent Claim
60 words
A system as claimed in claim 1 , characterized in that switching from the second operating mode ( 200 ) to the first operating mode ( 100 ) occurs when at least the following condition is determined: the first signal pM is close to a reference value pMref and the third signal nT does not exceed the threshold value nTlim.
Claim 6
Dependent Claim
44 words
A system as claimed in claim 1 , characterized in that switching from the first operating mode ( 100 ) to the third operating mode ( 300 ) occurs when the following condition is determined: the third signal nT reaches a threshold value nTlim.
Claim 7
Dependent Claim
57 words
A system as claimed in claim 1 , characterized in that switching from the third operating mode ( 300 ) to the first operating mode ( 100 ) occurs when the following condition is determined: the first signal pM reaches a threshold value pMlim and the second signal pT does not exceed a respective threshold value pTlim.
Claim 8
Dependent Claim
44 words
A system as claimed in claim 1 , characterized in that switching from the second operating mode ( 200 ) to the third operating mode ( 300 ) occurs when the following condition is determined: the third signal nT reaches a threshold value nTlim.
Claim 9
Dependent Claim
55 words
A system as claimed in claim 1 , characterized in that switching from the third operating mode ( 300 ) to the second operating mode ( 200 ) occurs when the following condition is determined: the second signal pT reaches a threshold value pTlim and the third signal nT is below the threshold value nTlim.
Claim 10
Dependent Claim
70 words
A system as claimed in claim 1 , characterized in that each operating mode ( 100 a , 200 a , 300 a ) is of composed type and provides for a first sub-operating-mode ( 110 , 210 , 310 ) of controlling said turbocharger ( 4 ), and a second sub-operating-mode ( 120 , 220 , 320 ) of controlling said turbocharger ( 4 ); said sub-operating-modes being alternative.
Claim 11
Dependent Claim
36 words
A system as claimed in claim 9 , characterized in that transition between said operating modes of composed type ( 100 a , 200 a , 300 a ) takes precedence over transition between said sub-operating-modes.
Claim 12
Dependent Claim
71 words
A system as claimed in claim 9 , characterized in that said first sub-operating-mode provides for control of the turbocharger ( 4 ) by said first controller ( 41 ) or said second controller ( 43 ) or said third controller ( 46 ); said second sub-operating-mode controlling the turbocharger ( 4 ) by limiting the pressure of the exhaust gas supplied to the turbine ( 10 ) of said turbocharger.
Claim 13
Dependent Claim
60 words
System according to claim 9 , characterized in that switching from the first operating mode of composed type ( 100 a ) to the second operating mode of composed type ( 200 a ) occurs when at least the following conditions is determined: engine is in a transient and the third signal nT is lower than a threshold value nTlim.
Claim 14
Dependent Claim
53 words
System according to claim 9 , characterized in that switching from the third operating mode of composed type ( 300 a ) to the second operating mode of composed type ( 200 a ) occurs when at least the following conditions is determined: third signal nT is much lower than threshold value nTlim.
Claim 15
Dependent Claim
67 words
A system as claimed in claim 9 , characterized in that said first operating mode ( 100 a ) of composed type comprises: a first sub-operating mode ( 110 ) in which turbocharger ( 4 ) is controlled by said first controller ( 41 a ); a second sub-operating-mode ( 120 ) in which turbocharger ( 4 ) is controlled by preturbine pressure limiter ( 41 ).
Claim 16
Dependent Claim
73 words
A system according to claim 14 , characterised in that transition from the first sub-operating mode ( 110 ) to the second sub-operating mode ( 120 ) occurs when second signal pT reaches a limit value and first signal pM is below a reference value pMref; and transition from the second sub-operating mode ( 120 ) to the first sub-operating mode ( 110 ) occurs when first signal pM reaches limit value pMlim.
Claim 17
Dependent Claim
67 words
A system as claimed in claim 9 , characterized in that said second operating mode ( 200 a ) of composed type comprises: a first sub-operating mode ( 210 ) in which turbocharger ( 4 ) is controlled by said second controller ( 43 ); a second sub-operating-mode ( 220 ) in which turbocharger ( 4 ) is controlled by preturbine pressure limiter ( 43 a ).
Claim 18
Dependent Claim
74 words
A system according to claim 16 , characterised in that transition from the first sub-operating made ( 210 ) to the second sub-operating mode ( 220 )) occurs when the second signal pT slowly reaches a limit value; and transition from the second sub-operating mode ( 220 ) to the first sub-operating mode ( 210 ) occurs when the error between a reference signal pTref and the second signal pT exceeds a threshold band.
Claim 19
Dependent Claim
67 words
A system as claimed in claim 9 , characterized in that said third operating mode ( 300 a ) of composed type comprises: a first sub-operating mode ( 310 ) in which turbocharger ( 4 ) is controlled by said third controller ( 46 ); a second sub-operating-mode ( 320 ) in which turbocharger ( 4 ) is controlled by preturbine pressure limiter ( 46 a ).
Claim 20
Dependent Claim
69 words
A system as claimed in claim 18 , characterised in that transition from first sub-operating mode ( 310 ) to second sub-operating mode ( 320 ) occurs when second signal pT reaches a limit value and third signal nT is below limit value nTlim; transition from second sub-operating mode ( 320 ) to first sub operating mode ( 310 ) occurs when third signal nT reaches limit value nTlim.
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| 3.5 Years (Year 4) | 2006-02-24 | 2006-08-26 | 2007-02-25 | $2000.00 | Window Closed / Lapsed |
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