EP0474652B1
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EP
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Process for measuring erratic running in an internal combustion engine and application of said process
Assignee: Robert Bosch GmbH
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Filing: 1990-05-14
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Granted: 1994-08-03
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Expires: 2010-05-14
Abstract
Abstract Erractic running in an internal combustion engine is measured using the following equation: LUW = f(T) x |(T_V2 - T_V1) - (T_V3 - T_V2)|, where T_V1, T_V2 and T_V3 are combustion periods each of which is measured between two given segment marks. Different sets of erratic running values are obtained by substituting combustion periods for different combinations of cylinders in the above-mentioned equation. The erratic running values in each set are averaged and the difference between the minimum and maximum values of the average values is calculated. The difference is taken as a measure of the degree of erratic running.
Inventors
- 👤 Martin Klenk
- 👤 Winfried Moser
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
193 words
Method of measuring running irregularity in the case of an internal combustion engine, in which: - the time interval T_V1 in which the crankshaft rotates about a predetermined angular range is measured for a first expansion stroke V1; - the time interval T_V2 in which the crankshaft rotates about a predetermined angular range is measured for a second expansion stroke V2; - the time interval T_V3 in which the crankshaft rotates about a predetermined angular range is measured for a third expansion stroke V3; and - running irregularity values LUW are calculated and averaged with LUW = f(T) x |(T_V2 - T_V1) - (T_V3 - T_V2)|; T being at least one of the time intervals T_V1, T_V2 or T_V3; characterized in that: - said time intervals are measured for the expansion strokes of cylinders of which at least two are not adjacent; - said running irregularity values are calculated with time intervals for different groups of cylinders; - the maximum and minimum values of the calculated group values are determined; - the difference between the maximum and minimum values is calculated and evaluated as the value for the extent of the running irregularity.
Claim 2
Dependent Claim
36 words
Method according to Claim 1, characterized in that cylinders with which the same crankshaft angular ranges are associated in each case successively after the beginning and end of said time intervals are used as non-adjacent cylinders.
Claim 3
Dependent Claim
36 words
Method according to Claim 2, characterized in that each angular range extends from one segment mark to the next one in the case of an internal combustion engine having n cylinders and n /2 segment marks.
Claim 4
Dependent Claim
24 words
Method according to any one of Claims 1 - 3, characterized in that the running irregularity values LUW are restricted to a maximum value.
Claim 5
Dependent Claim
25 words
Method according to any one of Claims 1 - 4, characterized in that the detection of running irregularity is suppressed when the load changes rapidly.
Claim 6
Dependent Claim
30 words
Method according to any one of Claims 1 - 5, characterized in that the detection of running irregularity is suppressed during a transient time interval after the engine has started.
Claim 7
Dependent Claim
51 words
Method according to any one of Claims 1 - 3, characterized in that the actual running irregularity differential value averaged in each case is compared with a differential threshold value and the existence of misfiring on combustion is established if the averaged running irregularity differential value exceeds the differential threshold value.
References Cited (Backward Citations)
No citation records indexed.
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