Misfiring detecting apparatus for an internal combustion device
First Claim
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1. An apparatus for detecting occurrence of misfiring in an internal combustion engine, comprising:
- at least two misfiring detecting means for detecting misfiring independently of each other, said misfiring detecting means operating based on mutually different detection principles, respectively; and
means operatively coupled to the outputs of said at least two misfiring detecting means for deciding occurrence of misfiring only when both outputs of said at least two misfiring detecting means indicate occurrence of misfiring.
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Abstract
An apparatus for defecting occurrence of misfiring in an internal combustion engine with improved reliability. A change in an angular velocity of a crankshaft of the engine and a change in the output of an air/fuel ratio sensor are monitored. Only when both changes indicate occurrence of misfiring independently from each other, it is decided that misfiring in the cylinder has taken place. Reliability in misfiring detection is improved by using the results obtained through at least two mutually different types of misfiring detections.
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Citations
7 Claims
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1. An apparatus for detecting occurrence of misfiring in an internal combustion engine, comprising:
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at least two misfiring detecting means for detecting misfiring independently of each other, said misfiring detecting means operating based on mutually different detection principles, respectively; and means operatively coupled to the outputs of said at least two misfiring detecting means for deciding occurrence of misfiring only when both outputs of said at least two misfiring detecting means indicate occurrence of misfiring.
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2. An apparatus for detecting occurrence of misfiring in an internal combustion engine, comprising:
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a plurality of sensors for sensing engine operating parameters which differ from one another and which represent a combustion state of said engine; a plurality of misfiring detecting means provided in association with said sensors, respectively, for processing output signals of said sensors to thereby detect occurrence of misfiring in the engine independently of one another; and decision means connected to the outputs of said misfiring detecting means for deciding occurrence of misfiring when at least two of said misfiring detecting means detect occurrence of misfiring substantially simultaneously. - View Dependent Claims (3, 4, 5, 6, 7)
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Specification