Method of detecting combustion misfires
First Claim
1. A method for detecting combustion misfires in an internal combustion engine on the basis of a discrete first signal wherein the nonuniformity of the rotational movement of the crankshaft of the engine is imaged, the method comprising the steps of:
- generating a second signal which is periodic and has a period duration corresponding to one of the following;
the cycle duration of a complete work cycle of said engine or said cycle duration divided by a whole number and said second signal having a fixed phase relationship to the rotational movement of said crankshaft;
providing an ancillary signal based on said discrete first signal;
modulating said second signal with said ancillary signal and filtering said second signal to form a third signal; and
,utilizing said third signal for detecting the presence of misfires and for identifying the cylinder affected by said misfires.
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Abstract
The invention is directed to a method for detecting combustion misfires in an internal combustion engine on the basis of a first signal wherein the nonuniformity of the rotational movement of the crankshaft of the engine is imaged. The method includes the steps of: generating a second signal which is periodic and has a period duration corresponding to one of the following: the cycle duration of a complete work cycle of the engine or the cycle duration divided by a whole number, and the second signal having a fixed phase relationship to the rotational movement of said crankshaft; providing an ancillary signal based on the first signal; modulating the second signal with the ancillary signal and filtering the second signal to form a third signal; and, utilizing the third signal for detecting the presence of misfires and for identifying the cylinder affected by the misfires.
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Citations
5 Claims
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1. A method for detecting combustion misfires in an internal combustion engine on the basis of a discrete first signal wherein the nonuniformity of the rotational movement of the crankshaft of the engine is imaged, the method comprising the steps of:
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generating a second signal which is periodic and has a period duration corresponding to one of the following;
the cycle duration of a complete work cycle of said engine or said cycle duration divided by a whole number and said second signal having a fixed phase relationship to the rotational movement of said crankshaft;providing an ancillary signal based on said discrete first signal; modulating said second signal with said ancillary signal and filtering said second signal to form a third signal; and
,utilizing said third signal for detecting the presence of misfires and for identifying the cylinder affected by said misfires. - View Dependent Claims (2, 3, 4)
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5. A method for detecting combustion misfires in an internal combustion engine on the basis of a first signal wherein the nonuniformity of the rotational movement of the crankshaft of the engine is imaged, the method comprising the steps of:
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providing said first signal as a discrete first signal as a sequence of segment times (ts) which are discretely detected in accordance with the sequence of ignitions of said engine; generating a second signal which is periodic and has a period duration corresponding to one of the following;
the cycle duration of a complete work cycle of said engine or said cycle duration divided by a whole number and said second signal having a fixed phase relationship to the rotational movement of said crankshaft;providing an ancillary signal based on said first signal; modulating said second signal with said ancillary signal and filtering said second signal to form a third signal; and
,utilizing said third signal for detecting the presence of misfires and for identifying the cylinder affected by said misfires.
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Specification