Device for detecting variation between cylinders of and device for detecting variation between banks of internal combustion engine
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Abstract
An inter-bank variation detection device of an internal combustion engine provided with a valve opening characteristic setting means (57) for changing the valve opening characteristic of an intake valve (9) for each of the cylinders (#1 to #4) or each of the bank (BL, BR); an indicator detecting means for detecting indicators of the state of combustion for each bank at the time of a first valve opening characteristic set by the valve opening characteristic setting means and the time of a second valve opening characteristic smaller than the first valve opening characteristic; a fuel injection amount variation detecting means (27) for detecting variation of the fuel injection amount for each bank by using the indicator (Xfn) detected by the indicator detecting means at the time of the first valve opening characteristic; and a valve opening characteristic variation detecting means (27) for detecting variation of the valve opening characteristic for each bank by using the indicator (Xsn) detected by the indicator detecting means at the time of the second valve opening characteristic and the variation of the fuel injection amount detected by the fuel injection amount variation detecting means is provided. It is also possible to change the valve opening characteristic of the intake valve by the valve opening characteristic setting means so that the variation of valve opening characteristic for each cylinder or each bank is eliminated.
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Citations
32 Claims
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1-16. -16. (canceled)
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17. An inter-cylinder variation detection device of an internal combustion engine comprising:
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a valve opening characteristic setting means for changing an operating angle and/or amount of lift of an intake valve, wherein the valve opening characteristic setting means can set a first valve opening characteristic and a second valve opening characteristic having a smaller operating angle or amount of lift than that at the time of the first valve opening characteristic, and further a calculating means for detecting an indicator of the state of combustion in each cylinder at the time of the first valve opening characteristic and the time of the second valve opening characteristic set by said valve opening characteristic setting means and, at the same time, calculating the deviation between these indicators and a standard value for each cylinder and a detecting means for detecting the variation among cylinders by using the deviation for each cylinder at the time of the first valve opening characteristic and the deviation for each cylinder at the time of the second valve opening characteristic calculated by said calculating means. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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18. An inter-cylinder variation detection device of an internal combustion engine comprising:
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a valve opening characteristic setting means for changing an operating angle or amount of lift of an intake valve, wherein the valve opening characteristic setting means can set a first valve opening characteristic and a second valve opening characteristic having a smaller operating angle or amount of lift than that at the time of the first valve opening characteristic, and further a calculating means for detecting an indicator of the state of combustion in each cylinder at the time of the first valve opening characteristic and the time of the second valve opening characteristic set by said valve opening characteristic setting means and, at the same time, calculating the deviation between these indicators and an average value of the indicators of the state of combustion for the cylinders and a detecting means for detecting the variation among cylinders by using the deviation for each cylinder at the time of the first valve opening characteristic and the deviation for each cylinder at the time of the second valve opening characteristic calculated by said calculating means.
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26. An inter-cylinder variation detection device of an internal combustion engine comprising:
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a valve opening characteristic setting means for changing a valve opening characteristic of an intake valve;
an indicator detecting means for detecting indicators of the state of combustion for each cylinder at the time of a first valve opening characteristic and at the time of a second valve opening characteristic smaller than the first valve opening characteristic set by the valve opening characteristic setting means;
a fuel injection amount variation detecting means for detecting the variation of the fuel injection amount for each of the cylinders by using said indicator of the state of combustion detected by said indicator detecting means at the time of said first valve opening characteristic; and
a valve opening characteristic variation detecting means for detecting variation of the valve opening characteristic for each of said cylinders by using said indicator of the state of combustion detected by said indicator detecting means at the time of said second valve opening characteristic and the variation of the fuel injection amount detected by said fuel injection amount variation detecting means. - View Dependent Claims (27, 28)
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29. An inter-bank variation detection device of an internal combustion engine comprising:
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a valve opening characteristic setting means for changing a valve opening characteristic of an intake valve for each bank;
an indicator detecting means for detecting indicators of the state of combustion for each cylinder at the time of a first valve opening characteristic and at the time of a second valve opening characteristic smaller than the first valve opening characteristic set by the valve opening characteristic setting means;
a fuel injection amount variation detecting means for detecting the variation of the fuel injection amount for each of said cylinders by using said indicator of the state of combustion detected by said indicator detecting means at the time of said first valve opening characteristic; and
a valve opening characteristic variation detecting means for detecting the variation of the valve opening characteristic for each of said cylinders by using said indicator of the state of combustion detected by said indicator detecting means at the time of said second valve opening characteristic and the variation of the fuel injection amount detected by said fuel injection amount variation detecting means and finding the average of the variations of the valve opening characteristics for the cylinders for each bank to thereby detect the variation of the valve opening characteristic for each bank. - View Dependent Claims (31, 32)
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30. An inter-bank variation detection device of an internal combustion engine provided with:
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a valve opening characteristic setting means for changing a valve opening characteristic of an intake valve for each bank;
an indicator detecting means for detecting indicators of the state of combustion for each bank at the time of a first valve opening characteristic and at the time of a second valve opening characteristic smaller than the first valve opening characteristic set by the valve opening characteristic setting means;
a fuel injection amount variation detecting means for detecting the variation of the fuel injection amount for each bank by using said indicator of the state of combustion detected by said indicator detecting means at the time of said first valve opening characteristic; and
a valve opening characteristic variation detecting means for detecting the variation of the valve opening characteristic for each bank by using said indicator of the state of combustion detected by said indicator detecting means at the time of said second valve opening characteristic and the variation of the fuel injection amount detected by said fuel injection amount variation detecting means.
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Specification