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.
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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.
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Citations
10 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control device for an internal-combustion engine, which includes diagnostic means for diagnosing a charge cycle valve stroke adjusting system of an internal combustion engine that has at least one exhaust gas sensor which supplies an output signal which continuously varies with an exhaust gas constitute, wherein said diagnostic means is programmed to perform the following steps:
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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 the comparison.
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Specification