Method and apparatus for engine abnormality detection
First Claim
1. An engine abnormality detection apparatus which measures specific data from at least one system for an engine and which detects abnormality in a respective system, said apparatus comprising:
- a memory for storing a value of an engine rotational speed and a value of a fuel injection volume at an equivalent rated power point;
a detection sensor for measuring a specific operating variable of a system of said engine;
an engine rotational speed sensor for measuring an engine rotational speed;
a fuel injection volume sensor for measuring a volume of injected fuel;
storing and selection means for storing in a memory a rotational speed value from said engine rotational speed sensor and a fuel injection volume value from said fuel injection volume sensor at each of a plurality of points in time during a first period of time, for inputting a measured value of said specific operating variable at each of said plurality of points in time from said detection sensor, and for selecting a largest value of the inputted measured values; and
conversion means for correcting said largest value to become a corrected value of the specific operating variable for the values of the engine rotational speed and the fuel injection volume at the equivalent rated power point, and for storing the corrected value in memory.
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Accused Products
Abstract
In engine abnormality detection, the engine output is measured, and values of a specific operating variable of the fuel system, the lubrication system, the cooling system, the intake system, or the exhaust system of the engine, are measured and the specific values are converted to corrected data values at the equivalent rated power point, which are compared to corresponding threshold values in order to detect an abnormality in the respective system. The apparatus includes detection sensors (33-38) for detecting values of specific operating variables; an engine rotational speed sensor (31); a fuel injection volume sensor (32); storing means (45a), for storing in memory the values of the engine rotational speed and the volume of injected fuel at the rated power point; specific data selection means (45b, 45d), for storing in memory the rotational speed value and the fuel injection volume value for a point in time within a first period of time, for measuring the value of the specific operating variable at that point in time, and for selecting the largest value from among the measured values of the specific operating variable; specific data conversion means (45c, 45e), for converting the largest value to a corrected value at the equivalent rated power point of the engine, and for storing the results in memory; and alarm output means (46), for issuing an alarm if the corrected value is larger than a corresponding threshold value.
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Citations
18 Claims
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1. An engine abnormality detection apparatus which measures specific data from at least one system for an engine and which detects abnormality in a respective system, said apparatus comprising:
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a memory for storing a value of an engine rotational speed and a value of a fuel injection volume at an equivalent rated power point; a detection sensor for measuring a specific operating variable of a system of said engine; an engine rotational speed sensor for measuring an engine rotational speed; a fuel injection volume sensor for measuring a volume of injected fuel; storing and selection means for storing in a memory a rotational speed value from said engine rotational speed sensor and a fuel injection volume value from said fuel injection volume sensor at each of a plurality of points in time during a first period of time, for inputting a measured value of said specific operating variable at each of said plurality of points in time from said detection sensor, and for selecting a largest value of the inputted measured values; and conversion means for correcting said largest value to become a corrected value of the specific operating variable for the values of the engine rotational speed and the fuel injection volume at the equivalent rated power point, and for storing the corrected value in memory. - View Dependent Claims (2, 3, 4, 5)
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6. An engine abnormality detection device for measuring an engine exhaust gas temperature to detect an abnormality in an engine system, said apparatus comprising:
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an exhaust gas temperature sensor, that detects a temperature of exhaust gas from an engine; an engine rotational speed sensor, that measures a rotational speed of the engine; a fuel injection volume sensor, that measures a volume of injected fuel to the engine; storing means for storing in memory a value of an engine rotational speed and a value of fuel injection volume at an equivalent rated power point; exhaust gas temperature selection means for storing in memory a value of rotational speed from said engine rotational speed sensor and a value of fuel injection volume from said fuel injection volume sensor at each of a plurality of points in time during a first period of time, for measuring an engine exhaust gas temperature at each of said plurality of points in time, and for selecting a largest value of measured engine exhaust gas temperature from among thus measured engine exhaust gas temperatures; exhaust gas temperature conversion means for correcting said largest value of measured engine exhaust gas temperature to a corrected exhaust gas temperature value for the engine rotational speed and the fuel injection volume at the equivalent rated power point, and for storing the corrected exhaust gas temperature value in memory; and alarm output means for outputting an alarm if the corrected exhaust gas temperature value at the equivalent rated power point is larger than a corresponding threshold value. - View Dependent Claims (7)
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8. An engine abnormality detection apparatus for measuring an engine blowby gas pressure to detect an abnormality in components of an engine, said apparatus comprising:
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a blowby gas pressure sensor for measuring a blowby gas pressure of the engine; an engine rotational speed sensor for measuring a rotational speed of the engine; a fuel injection volume sensor for measuring a volume of injected fuel; storing means for storing in memory a value of engine rotational speed and a value of fuel injection volume at an equivalent rated power point; blowby gas pressure selecting means for selecting a largest blowby gas pressure value from values of the blowby gas pressure measured by said blowby gas pressure sensor at a plurality of points in time within a first period of time; blowby gas pressure conversion means for converting said largest blowby gas pressure value to become a corrected blowby gas pressure value for the engine rotational speed and the fuel injection volume at the equivalent rated power point, and for storing the corrected blowby gas pressure value in memory; and alarm means for outputting an alarm if the corrected blowby gas pressure value is larger than a corresponding threshold value.
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9. A method for ascertaining an abnormality in a system related to an engine, said method comprising the steps of:
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measuring a value of a specific operating variable of said engine at each of a plurality of points in time during a first period of time; measuring a value of an engine rotational speed of said engine at each of said plurality of points in time during said first period of time; measuring a value of a fuel injection volume for said engine at each of said plurality of points in time during said first period of time; storing in a memory each thus measured engine rotational speed value and each thus measured fuel injection volume value; selecting a largest value of the measured values of the specific operating variable during said first period of time; and converting said largest value to become a corrected value of the specific operating variable at the equivalent rated power point; and storing the corrected value in memory. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for ascertaining an abnormality in a system related to an engine, said method comprising the steps of:
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measuring a value of an engine exhaust gas temperature at each of a plurality of points in time within a first period of time; selecting a highest measured value of exhaust gas temperature from among the values measured within said first period of time; converting said highest measured value of exhaust gas temperature to a corrected exhaust gas temperature value at an equivalent rated power point; and issuing an alarm if said corrected exhaust gas temperature value is higher than a corresponding threshold value. - View Dependent Claims (17)
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18. An engine abnormality detection method which measures a blowby gas pressure of an engine to detect an abnormality in engine pistons, piston rings and other components of the engine, said method comprising the steps of:
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storing in memory a value of an engine rotational speed and a value of a fuel injection volume; measuring a value of the blowby gas pressure of the engine at each of a plurality of points in time during a first period of time; and selecting a largest value of the values of the blowby gas pressure from among those measured during said first period of time; and issuing an alarm if said largest value is higher than a corresponding threshold value.
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Specification