Method of detecting combustion misfires
First Claim
1. A method for detecting combustion misfires in a multi-cylinder internal combustion engine having a crankshaft which performs a rotational movement during operation of the engine, the method comprising the steps of:
- providing a first signal imaging nonuniformities in the rotational movement of the crankshaft;
forming and successively changing corrective values for each cylinder individually and specifically for each load/rpm range of a plurality of load/rpm ranges until a predetermined condition is satisfied;
logically coupling the corrective value of the first one of said load/rpm ranges wherein said predetermined condition is satisfied to said first signal also in the remaining ones of said ranges so long until said condition is also satisfied in said remaining ones of said ranges to thereby form a second signal less influenced by said nonuniformities than said first signal; and
,detecting a misfire when said second signal crosses over a reference value.
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Abstract
A first signal imaging nonuniformities in the rotational movement of the crankshaft is provided and corrective values are formed and successively changed for each cylinder individually and specifically for each load/rpm range of a plurality of load/rpm ranges until a predetermined condition is satisfied. The corrective value of the first one of the load/rpm ranges wherein the predetermined condition is satisfied is logically coupled to the first signal also in the remaining ones of said the ranges so long until the condition is also satisfied in the remaining ones of the ranges to thereby form a second signal less influenced by the nonuniformities than the first signal. A misfire is then detected when the second signal crosses over a reference value.
18 Citations
12 Claims
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1. A method for detecting combustion misfires in a multi-cylinder internal combustion engine having a crankshaft which performs a rotational movement during operation of the engine, the method comprising the steps of:
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providing a first signal imaging nonuniformities in the rotational movement of the crankshaft; forming and successively changing corrective values for each cylinder individually and specifically for each load/rpm range of a plurality of load/rpm ranges until a predetermined condition is satisfied; logically coupling the corrective value of the first one of said load/rpm ranges wherein said predetermined condition is satisfied to said first signal also in the remaining ones of said ranges so long until said condition is also satisfied in said remaining ones of said ranges to thereby form a second signal less influenced by said nonuniformities than said first signal; and
,detecting a misfire when said second signal crosses over a reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification