Fail detecting system for sensor monitoring concentration of a fuel in blended multi-fuel for internal combustion engine and fail-safe system in lambda-control
First Claim
1. A fail-detection system for a fuel concentration sensor for monitoring concentration of one of a plurality of different types of fuels which are blended to be supplied to an internal combustion engine, which fuel concentration sensor vaires output signal level depending upon the monitored fuel concentration in the blended fuels, said system comprising:
- first means for receiving the output signal from said fuel concentration sensor for providing a monitored data associated with monitored fuel concentration;
second means for providing a reference data representative of normal range of the value of said monitored data; and
third means for comparing said monitored data with said reference data for detecting abnormality of said fuel concentration sensor when said monitored data is out of a predetermined relationship with said reference data.
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Accused Products
Abstract
A fail-detection system is designed for detecting failure of a fuel concentration sensor for monitoring concentration of one of a plurality of different types of fuels which are blended to be supplied to an internal combustion engine, which fuel concentration sensor varies output signal level depending upon the monitored fuel concentration in the blended fuels. The system comprises first means for receiving the output signal from the fuel concentration sensor for providing a monitored data associated with monitored fuel concentration, second means for providing a reference data representative of normal range of the value of the monitored data, and third means for comparing the monitored data with the reference data for detecting abnormality of the fuel concentration sensor when the monitored data is out of a predetermined relationship with the reference data.
46 Citations
16 Claims
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1. A fail-detection system for a fuel concentration sensor for monitoring concentration of one of a plurality of different types of fuels which are blended to be supplied to an internal combustion engine, which fuel concentration sensor vaires output signal level depending upon the monitored fuel concentration in the blended fuels, said system comprising:
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first means for receiving the output signal from said fuel concentration sensor for providing a monitored data associated with monitored fuel concentration; second means for providing a reference data representative of normal range of the value of said monitored data; and third means for comparing said monitored data with said reference data for detecting abnormality of said fuel concentration sensor when said monitored data is out of a predetermined relationship with said reference data. - View Dependent Claims (2, 3, 4)
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5. A fail-detection system for a fuel concentration sensor for monitoring concentration of one of a plurality of different types of fuels which are blended to be supplied to an internal combustion engine, which fuel concentration sensor vaires output signal level depending upon the monitored fuel concentration in the blended fuels, said system comprising:
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first means sampling said output signal of said fuel concentration sensor with a given interval as said monitored data; second means providing first reference data representative of a predetermined allowable maximum value of said monitored data and a second reference data representative of a predetermined allowable minimum value of said monitored data; and third means detecting abnormality of said fuel concentration sensor when said monitored data value is out of an allowable range defined by said first and second reference data. - View Dependent Claims (6)
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7. A fail-detection system for a fuel concentration sensor for monitoring concentration of one of a plurality of different types of fuels which are blended to be supplied to an internal combustion engine, which fuel concentration sensor varies output signal level depending upon the monitored fuel concentration in the blended fuels, said system comprising:
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first means including a first peak hold means for sampling and holding upper peak value of said monitored data and a second peak hold circuit means for sampling and holding lower peak value of said monitored data, and a difference deriving means for deriving a difference data of said upper peak value and said lower peak value; second means provides said reference data representative of an allowable maximum difference value; and third means compares said difference data with said reference data to detect abnormality of said fuel concentration sensor when the difference data is greater than said reference data. - View Dependent Claims (8)
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9. A fuel injection control system for an internal combustion engine for which a blended fuel composed of mutually different type of plurality of fuel is supplied for performing combustion, comprising:
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a fuel injection system for injecting controlled amount of the blended fuel to an induction system of said engine for forming an air/fuel mixture to be combustioned in a combustion chamber of the engine; first means for monitoring basic fuel injection control parameter for deriving a basic fuel injection amount on the basis thereof; second means for monitoring preselected fuel injection amount correcting parameter for deriving a correction value for correcting said basic fuel injection amount; third means for monitoring blending ratio of selected one of fuels in said blended fuel for deriving a blending ratio dependent correction value for correcting said basic fuel injection amount based thereon, said third means including a sensor for monitoring concentration of the selected one of fuels; fourth means for detecting abnormality of said sensor, including a monitoring data providing means for receiving the output signal from said fuel concentration sensor for providing a monitored data associated with monitored fuel concentration, a reference data providing means for providing a reference data representative of normal range of the value of said monitored data, and an abnormality detecting means for comparing said monitored data with said reference data for detecting abnormality of said fuel concentration sensor when said monitored data is out of a predetermined relationship with said reference data; and fifth means responsive to said fourth means detecting abnormality of said sensor for switching operational mode of said third means from normal mode in which the blending ratio dependent correction value on the basis of the monitored blending ratio, to a fail-safe mode in which said blending ratio dependent correction value is fixed at a given constant value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification