Method of determining misfiring
AssigneeMannesmann VDO AG
InventorsThomas Hopf, Ulrich Staufenberg
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Abstract
A method for the determination of combustion misfires in an internal combustion engine having a plurality of cylinders, there being provision, for determining at least two successive compression times and expansion times for at least one cylinder of the internal combustion engine, for the determination of combustion misfires a comparison of the change in the compression times with the change in the expansion times being carried out, and the result of the comparison being a measure of a combustion misfire.
Claims10
A method for the determination of combustion misfires in an internal combustion engine having a plurality of cylinders,
- comprising the steps of:
- (a) measuring at least two successive compression times and expansion times for a cylinder;
- (b) forming the difference between compression times for said cylinder;
- (c) forming the difference between expansion times for said cylinder;
- and
- (d) forming the difference between the differences calculated in steps (b) and (c), wherein this difference provides a measure of a combustion misfire.
A method for the determination of combustion misfires in an internal combustion engine having a plurality of cylinders,
- comprising the steps of:
- (a) measuring at least two successive compression times and expansion times for at least two cylinders;
- (b) forming the difference between compression times for said cylinder;
- (c) forming the difference between expansion times for said cylinder;
- and
- forming the difference between the differences calculated in steps (b) and (c), wherein this difference provides a measure of a combustion misfire wherein the step of measuring successive compression times are carried out on two cylinders, with one cylinder providing a first compression time and the other cylinder providing a second compression time;
- and
- the step of measuring successive expansion times are carried out on these same two cylinders, with one cylinder providing one expansion time and the other cylinder providing a second expansion time.
A method for the determination of combustion misfires in an internal combustion engine having a plurality of cylinders, wherein at least two successive compression times and expansion times are determined and the ratio of a difference in compression times to a difference in expansion times is computed for at least one cylinder of the internal combustion engine, for the determination of combustion misfires a comparison of the change in the compression times with the change in the expansion times being carried out, and the result of the comparison being a measure of a combustion misfire.
Dependencies are inferred from the claim text.