US5377535A
Expired / Lapsed
US
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Method for identifying and correcting errors in time measurements on rotating shafts
Assignee: Siemens AG
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Filing: 1993-08-16
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Granted: 1995-01-03
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Expires: 2013-08-16
Abstract
Abstract A method for identifying and correcting errors in time measurement on rotating shafts, particularly on crankshafts or shafts connected thereto in internal combustion engines, whereby the shafts are provided with marks which are scanned with sensors. The segment times required by the shaft to rotate about a defined angular distance are measured and compared with a reference segment.
Inventors
- 👤 Anton Angermaier
- 👤 Thomas Vogt
- 👤 Manfred Wier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:30
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0097; G; G01; G01M; G01M15/00; G01M15/04; G01M15/11; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/489
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
203 words
In a method for determining a segment time required for a segment of a rotating crankshaft of an internal combustion engine with z cylinders to rotate about a defined angular distance, in which the crankshaft or a tachometer disk connected thereto are provided with marks which are scanned by an associated sensor, a method for identifying and correcting errors in determining the segment time, which comprises: measuring and storing a reference segment time (TG 0 ) of a reference segment associated with a reference cylinder; subsequently measuring segment times (TG n ) of crankshaft segments associated with respective ones of the cylinders; measuring and storing a new segment time (TG 0 ') of the reference segment associated with the reference cylinder two full crankshaft rotations later; and calculating correction values (AZ n ) for each of the cylinders (n) in accordance with an equation ##EQU5## where z represents a total number of cylinders; subsequently averaging respective correction values (AZ n ) and storing the averaged correction values (AZM n ); and correcting the measured segment times (TG n ) with the averaged correction value (AZM n ) for forming corrected segment times (TK n ) according to an equation TK.sub.n =TG.sub.n * (1-AZM.sub.n).
Claim 2
Dependent Claim
203 words
In a method for determining a segment time required for a segment of a rotating crankshaft of an internal combustion engine with z cylinders to rotate about a defined angular distance, in which the crankshaft or a tachometer disk connected thereto are provided with marks which are scanned by an associated sensor, a method for identifying and correcting errors in determining the segment time, which comprises: measuring and storing a reference segment time (TG 0 ) of a reference segment associated with a reference cylinder; subsequently measuring segment times (TG n ) of crankshaft segments associated with respective ones of the cylinders; measuring and storing a new segment time (TG 0 ') of the reference segment associated with the reference cylinder two full crankshaft rotations later; and calculating correction values (AZ n ) for each of the cylinders (n) in accordance with an equation ##EQU5## where z represents a total number of cylinders; subsequently averaging respective correction values (AZ n ) and storing the averaged correction values (AZM n ); and correcting the measured segment times (TG n ) with the averaged correction value (AZM n ) for forming corrected segment times (TK n ) according to an equation TK.sub.n =TG.sub.n * (1-AZM.sub.n).
Claim 3
Dependent Claim
21 words
The method according to claim 1, which comprises calculating the correction values during a thrust cutoff operating state of the engine.
Claim 4
Dependent Claim
23 words
The method according to claim 1, which comprises calculating the correction values only within a given range of rotational speeds of the engine.
Claim 5
Dependent Claim
26 words
The method according to claim 1, which comprises establishing a threshold value of a rotational speed, and calculating the correction values only below the threshold value.
Claim 6
Dependent Claim
44 words
The method according to claim 1, which comprises performing the averaging step by calculating a sliding average according to an equation AZM.sub.n =AZM.sub.n-1 * (1-MITKO)+AZ.sub.n * MITKO where n is a dummy index and MITKO is a predetermined averaging constant between zero and one.
Claim 7
Dependent Claim
64 words
The method according to claim 1, which comprises initializing the correction values with initialization values during a first start of engine operation, and setting the correction values (AZ n ) for each further start of operation to values determined and stored during a preceding engine operation, and performing the correcting step only after the calculating step has been performed a predetermined number of times.
Claim 8
Dependent Claim
16 words
The method according to claim 6, which comprises initializing the correction values by resetting to zero.
Claim 9
Dependent Claim
25 words
The method according to claim 6, which comprises setting the predetermined number of times to a value being inversely proportional to the predetermined averaging constant.
Claim 10
Dependent Claim
180 words
In a method for determining a segment time required by a rotating crankshaft of an internal combustion engine with z cylinders to rotate about a defined angular span, wherein the crankshaft or a tachometer disk connected thereto are provided with marks which are scanned by an associated sensor, a method for identifying and correcting errors in determining the segment time, which comprises: measuring and storing a reference segment time (TB 0 ) of a reference segment associated with a reference cylinder; measuring and storing consecutive segment times (TB n ) of all segments of the rotating shaft; measuring and storing the reference segment time (TB 0 ') of the reference segment one crankshaft rotation later; calculating correction values (BZ n ) for respective ones of the segments (n) according to an equation ##EQU6## where z represents a total number of cylinders; subsequently averaging the correction values and storing the averaged correction values (BZM n ); correcting the actually measured segment times (TB n ) with the averaged correction values (BZM n ) according to an equation TBK.sub.n =TB.sub.n * (1-BZM.sub.n).
Claim 11
Dependent Claim
180 words
In a method for determining a segment time required by a rotating crankshaft of an internal combustion engine with z cylinders to rotate about a defined angular span, wherein the crankshaft or a tachometer disk connected thereto are provided with marks which are scanned by an associated sensor, a method for identifying and correcting errors in determining the segment time, which comprises: measuring and storing a reference segment time (TB 0 ) of a reference segment associated with a reference cylinder; measuring and storing consecutive segment times (TB n ) of all segments of the rotating shaft; measuring and storing the reference segment time (TB 0 ') of the reference segment one crankshaft rotation later; calculating correction values (BZ n ) for respective ones of the segments (n) according to an equation ##EQU6## where z represents a total number of cylinders; subsequently averaging the correction values and storing the averaged correction values (BZM n ); correcting the actually measured segment times (TB n ) with the averaged correction values (BZM n ) according to an equation TBK.sub.n =TB.sub.n * (1-BZM.sub.n).
Claim 12
Dependent Claim
21 words
The method according to claim 9, which comprises calculating the correction values during a thrust cutoff operating state of the engine.
Claim 13
Dependent Claim
23 words
The method according to claim 9, which comprises calculating the correction values only within a given range of rotational speeds of the engine.
Claim 14
Dependent Claim
26 words
The method according to claim 9, which comprises establishing a threshold value of a rotational speed, and calculating the correction values only below the threshold value.
Claim 15
Dependent Claim
44 words
The method according to claim 9, which comprises performing the averaging step by calculating a sliding average according to an equation BZM.sub.n =BZM.sub.n-1 * (1-MITKO)+BZ.sub.n * MITKO, where n is a dummy index and MITKO is a predetermined averaging constant between zero and one.
Claim 16
Dependent Claim
61 words
The method according to claim 9, which comprises initializing the correction values with initialization values during a first start of engine operation, and setting the correction values for each further start of operation to values determined and stored during a preceding engine operation, and performing the correcting step only after the calculating step has been performed a predetermined number of times.
Claim 17
Dependent Claim
16 words
The method according to claim 14, which comprises initializing the correction values by resetting to zero.
Claim 18
Dependent Claim
25 words
The method according to claim 14, which comprises setting the predetermined number of times to a value being inversely proportional to the predetermined averaging constant.
Claim 19
Dependent Claim
182 words
In a method for determining a segment time required for a segment of a rotating shaft to rotate about a defined angular distance, in which a shaft or a tachometer disk connected thereto are provided with marks which are scanned by an associated sensor, a method for identifying and correcting errors in determining the segment time, which comprises: measuring and storing a reference segment time (TG 0 ) of a reference segment; subsequently measuring segment times (TG n ) of further segments (n) of the shaft; measuring and storing a new segment time (TG 0 ') of the reference segment two full shaft rotations later; and calculating correction values (AZ n ) for each of the segments (n), in accordance with an equation ##EQU7## where z represents the total number of segments; subsequently averaging respective correction values (AZ n ) and storing the averaged correction value (AZM n ); and correcting the measured segment times (TG n ) with the averaged correction value (AZM n ) for forming corrected segment times (TK n ) according to an equation TK.sub.n =TG.sub.n * (1-AZM.sub.n).
Claim 20
Dependent Claim
182 words
In a method for determining a segment time required for a segment of a rotating shaft to rotate about a defined angular distance, in which a shaft or a tachometer disk connected thereto are provided with marks which are scanned by an associated sensor, a method for identifying and correcting errors in determining the segment time, which comprises: measuring and storing a reference segment time (TG 0 ) of a reference segment; subsequently measuring segment times (TG n ) of further segments (n) of the shaft; measuring and storing a new segment time (TG 0 ') of the reference segment two full shaft rotations later; and calculating correction values (AZ n ) for each of the segments (n), in accordance with an equation ##EQU7## where z represents the total number of segments; subsequently averaging respective correction values (AZ n ) and storing the averaged correction value (AZM n ); and correcting the measured segment times (TG n ) with the averaged correction value (AZM n ) for forming corrected segment times (TK n ) according to an equation TK.sub.n =TG.sub.n * (1-AZM.sub.n).
Claim 21
Dependent Claim
169 words
In a method for determining a segment time required by a rotating shaft to rotate about a defined angular span, in which the rotating shaft or a tachometer disk connected thereto are provided with marks which are scanned by an associated sensor, a method for identifying and correcting errors in determining the segment time, which comprises: measuring and storing a reference segment time (TB 0 ) of a reference segment; measuring and storing consecutive segment times (TB n ) of all segments of the rotating shaft; measuring and storing the reference segment time (TB 0 ') of the reference segment one shaft rotation later; calculating correction values (BZ n ) for respective ones of the segments (n) according to an equation ##EQU8## where z represents the total number of segments; subsequently averaging the correction values and storing the averaged correction values (BZM n ); correcting the actually measured segment times (TB n ) with the averaged correction values (BZM n ) according to an equation TBK.sub.n =TB.sub.n * (1-BZM.sub.n).
Claim 22
Dependent Claim
169 words
In a method for determining a segment time required by a rotating shaft to rotate about a defined angular span, in which the rotating shaft or a tachometer disk connected thereto are provided with marks which are scanned by an associated sensor, a method for identifying and correcting errors in determining the segment time, which comprises: measuring and storing a reference segment time (TB 0 ) of a reference segment; measuring and storing consecutive segment times (TB n ) of all segments of the rotating shaft; measuring and storing the reference segment time (TB 0 ') of the reference segment one shaft rotation later; calculating correction values (BZ n ) for respective ones of the segments (n) according to an equation ##EQU8## where z represents the total number of segments; subsequently averaging the correction values and storing the averaged correction values (BZM n ); correcting the actually measured segment times (TB n ) with the averaged correction values (BZM n ) according to an equation TBK.sub.n =TB.sub.n * (1-BZM.sub.n).
References Cited (Backward Citations)
US4216419A
Cited
EP0039900A2
Cited
DE3506233A1
Cited
US4858158A
Cited
US4814704A
Cited
EP0353216A1
Cited
US5117681A
Cited
US5237862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |