Method and control device for diagnosing a charge cycle valve stroke adjusting system of an internal-combustion engine
First Claim
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1. A method of diagnosing a charge cycle valve stroke adjusting system of an internal-combustion engine having at least one exhaust gas sensor which supplies an output signal that continuously varies with an exhaust gas constituent, said method comprising:
- measuring a spread width of said output signal;
comparing the measured spread width with a reference value; and
detecting defects of the valve stroke adjusting system based on a result of the comparison;
wherein,said internal-combustion engine has a plurality of groups of cylinders, and exhaust gas sensors for each cylinder group; and
measurement of spread width of the output signal of a first exhaust gas sensor for a first group of cylinders is defined as the reference value for measurement of spread width of the output signal of a second exhaust gas sensor for a second group of cylinders.
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Abstract
In a method for diagnosing a charge cycle valve stroke adjusting system of an internal-combustion engine having at least one exhaust gas sensor which supplies an output signal continuously varying with an exhaust gas constituent, the spread width of the output signal is determined, and compared with a reference value. Defects of the valve stroke adjusting system are detected on the basis of the comparison.
16 Citations
16 Claims
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1. A method of diagnosing a charge cycle valve stroke adjusting system of an internal-combustion engine having at least one exhaust gas sensor which supplies an output signal that continuously varies with an exhaust gas constituent, said method comprising:
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measuring a spread width of said output signal; comparing the measured spread width with a reference value; and detecting defects of the valve stroke adjusting system based on a result of the comparison;
wherein,said internal-combustion engine has a plurality of groups of cylinders, and exhaust gas sensors for each cylinder group; and measurement of spread width of the output signal of a first exhaust gas sensor for a first group of cylinders is defined as the reference value for measurement of spread width of the output signal of a second exhaust gas sensor for a second group of cylinders. - View Dependent Claims (2, 3)
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4. A method of diagnosing a charge cycle valve stroke adjusting system of an internal-combustion engine having at least one exhaust gas sensor which supplies an output signal that continuously varies with an exhaust gas constituent, said method comprising:
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measuring a spread width of said output signal; comparing the measured spread width with a reference value; and detecting defects of the valve stroke adjusting system based on a result of the comparison;
wherein,a difference is determined between the measurement of the spread width and the reference value; said difference is compared with the threshold value; and when said difference exceeds the threshold value, a defect is determined to exist. - View Dependent Claims (5, 6, 7)
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8. A method of diagnosing a charge cycle valve stroke adjusting system of an internal-combustion engine having at least one exhaust gas sensor which supplies an output signal that continuously varies with an exhaust gas constituent, said method comprising:
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measuring a spread width of said output signal; comparing the measured spread width with a reference value; and detecting defects of the valve stroke adjusting system based on a result of the comparison;
whereina range of possible values of the output signal of a particular exhaust gas sensor is divided into difference classes of a defined width; a value is then determined for a number of class boundaries through which the output signal or a filtered output signal passes, between two successive local extremes; and the sum of a predetermined number of determined values is formed and used as a measurement for the spread width. - View Dependent Claims (9, 10, 11, 12)
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13. A method of diagnosing a charge cycle valve stroke adjusting system of an internal-combustion engine having at least one exhaust gas sensor which supplies an output signal that continuously varies with an exhaust gas constituent, said method comprising:
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measuring a spread width of said output signal; comparing the measured spread width with a reference value; and detecting defects of the valve stroke adjusting system based on a result of the comparison;
wherein, an average value of the output signal is determined;an integral of absolute amounts of deviations of the output signal from the average value is determined; and the integral is used as a measurement of spread width. - View Dependent Claims (14, 15, 16)
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Specification