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 setting unit configured to set a calculation interval to a period during which at least all cylinders make one cycle of ignition; a recording unit configured to record a crank angular acceleration from one cylinder ignition to next cylinder ignition for each cylinder; a calculation unit configured to calculate a difference between a maximum value and a minimum value of the crank angular acceleration in the calculation interval for each cylinder; and a diagnosis unit configured to diagnose, for each cylinder, a cylinder for which the difference in the crank angular acceleration is equal to or greater than a threshold value as a misfiring cylinder.
Claims5
A misfire diagnosis device that diagnoses presence or absence of a misfire in an engine having a plurality of cylinders, comprising:
- a setting unit configured to set a calculation interval to a period during which at least all cylinders make one cycle of ignition;
- a recording unit configured to record a crank angular acceleration from one cylinder ignition to next cylinder ignition for each cylinder;
- a calculation unit configured to calculate a difference between a maximum value and a minimum value of the crank angular acceleration in the calculation interval for each cylinder;
- and
- a diagnosis unit configured to diagnose, for each cylinder, a cylinder for which the difference in the crank angular acceleration is equal to or greater than a threshold value as a misfiring cylinder.
A non-transitory storage medium storing a program 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:
- setting a calculation interval to a period during which at least all cylinders make one cycle of ignition;
- recording a crank angular acceleration from one cylinder ignition to next cylinder ignition for each cylinder;
- calculating a difference between a maximum value and a minimum value of the crank angular acceleration in the calculation interval for each cylinder;
- and
- diagnosing, for each cylinder, a cylinder for which the difference in the crank angular acceleration is equal to or greater than a threshold value as a misfiring cylinder.
Dependencies are inferred from the claim text.