Misfire diagnosis device
AssigneeSuzuki Motor Corporation
InventorKohei YAMAMOTO
Life of this patent
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Abstract
A misfire diagnosis device that diagnoses presence or absence of a misfire in an engine having a plurality of cylinders, includes: a recording unit configured to record a misfire index value indicative of a misfire state of some cylinders; a setting unit configured to set a calculation interval to a period during which at least all cylinders make one cycle of ignition; a calculation unit configured to calculate a difference between a maximum value and a minimum value of the misfire index value in the calculation interval; and a diagnosis unit configured to diagnose a misfire state when the difference in the misfire index value is equal to or greater than a threshold value.
Claims6
A misfire diagnosis device that diagnoses presence or absence of a misfire in an engine having a plurality of cylinders, comprising:
- a recording unit configured to record a misfire index value indicative of a misfire state of some cylinders;
- a setting unit configured to set a calculation interval to a period during which at least all cylinders make one cycle of ignition;
- a calculation unit configured to calculate a difference between a maximum value and a minimum value of the misfire index value in the calculation interval;
- and
- a diagnosis unit configured to diagnose a misfire state when the difference in the misfire index value is equal to or greater than a threshold value.
A non-transitory storage medium storing a program for a misfire diagnosis device that diagnoses presence or absence of a misfire in an engine having a plurality of cylinders, the program causing at least one processor to execute procedures comprising:
- recording a misfire index value indicative of a misfire state of some cylinders;
- setting a calculation interval to a period during which at least all cylinders make one cycle of ignition;
- calculating a difference between a maximum value and a minimum value of the misfire index value in the calculation interval;
- and
- diagnosing a misfire state when the difference in the misfire index value is equal to or greater than a threshold value.
Dependencies are inferred from the claim text.