Malfunction diagnosis apparatus for internal combustion engine
First Claim
1. A malfunction diagnosis apparatus for an internal combustion engine comprising:
- a fluctuation factor state measurement sensor;
an angular-based data sampler which samples data of an output signal from said fluctuation factor state measurement sensor at a rate dependent on engine speed;
a malfunction judgment means for judging a malfunction of a function of said internal combustion engine on the basis of data sampled by said angular-based data sampler;
a time-based data sampler which samples an output signal from said fluctuation state measurement sensor at every lapse of a predetermined constant time and supplies said output signal from said time-based data sampler to a filter.
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Abstract
Provided is an internal combustion engine malfunction diagnosis apparatus capable of diagnosing the deterioration of an internal combustion engine with a high accuracy and capable of diagnosing deterioration of a fluctuation factor detection section of the engine with a high accuracy in irrespective of the engine speed.
According to one embodiment of the present invention, there is provided a malfunction diagnosis apparatus for an internal combustion engine comprises: a crank angle detection sensor for detecting a crank angle of the internal combustion engine; a fluctuation factor measurement means for measuring a state of a fluctuation factor of the internal combustion engine; an angular-based data sampling section for sampling data of an output signal from the fluctuation factor measurement means at a predetermined rotation angle of a crank shaft in accordance with a crank angle signal from the crank angle detection sensor; a malfunction judgement section for judging a malfunction of the internal combustion engine on the basis of data sampled by the angular-based data sampling section; a time-based data sampling section for sampling an output signal from the fluctuation factor measurement means at every lapse of a predetermined constant time; and a fluctuation factor measurement means deterioration judgement section for judging deterioration of the fluctuation factor measurement means on the basis of data sampled by the time-based data sampling section.
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Citations
23 Claims
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1. A malfunction diagnosis apparatus for an internal combustion engine comprising:
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a fluctuation factor state measurement sensor; an angular-based data sampler which samples data of an output signal from said fluctuation factor state measurement sensor at a rate dependent on engine speed; a malfunction judgment means for judging a malfunction of a function of said internal combustion engine on the basis of data sampled by said angular-based data sampler; a time-based data sampler which samples an output signal from said fluctuation state measurement sensor at every lapse of a predetermined constant time and supplies said output signal from said time-based data sampler to a filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 23)
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9. A process for diagnosing the deterioration of an automobile function, comprising:
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sampling data of an output signal of a first fluctuation factor measurement section at a constant time interval, wherein a first sampled signal is defined; sampling data of an output signal of a second fluctuation factor measurement section at a rate dependent upon engine speed, wherein a second sampled signal is defined; and judging the deterioration of the fluctuation factor based on the sample data, wherein said judging comprises subtracting previous sampled data from the sampled data. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A device for diagnosing the deterioration of an automobile function, comprising:
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means for sampling data of an output signal of a first fluctuation factor measurement section at a constant time interval, wherein a first sampled signal is defined; means for supplying said first sampled signal to a difference filter which subtracts a previously supplied first sampled signal from said first sampled signal; means for sampling data of an output signal of a second fluctuation factor measurement section at a rate dependent upon engine speed, wherein a second sampled signal is defined; and means for judging the deterioration of the fluctuation factor based on the sampled data. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification