Method and device for detecting misfiring of internal combustion engines
First Claim
1. A method for detection of at least one of misfiring and unbalance between the cylinders of an internal combustion engine, said method comprising the steps of:
- using a torque sensor mounted on a crankshaft of an internal combustion engine to measure a torque of said internal combustion engine and generate a torque signal therefrom;
sampling said torque signal speed-synchronously;
performing a weighted averaging of the torque signal with a weighting function which cancels or damps an influence of sinusoidal variations of said torque signal with frequencies equal to a selection of integer or half-integer multiples of a speed of said internal combustion engine;
wherein;
said selection of speed multiples is substantially dependent on a number of cylinders of the internal combustion engine; and
said detection is based on a result of said averaging.
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Abstract
A method for detection of misfiring of an internal combustion engine, wherein the torque of the internal combustion engine is measured with the aid of a torque sensor mounted on the crankshaft of the internal combustion engine and wherein a torque signal is sampled speed-synchronously with the aid of a sensor. A digital filtering of the torque signal is carried out with a digital filter with a finite impulse response which blocks or damps a selection of integer or half-integer multiples of the speed of the internal combustion engine. The selection of speed multiples is substantially dependent on the number of cylinders of the internal combustion engine.
15 Citations
31 Claims
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1. A method for detection of at least one of misfiring and unbalance between the cylinders of an internal combustion engine, said method comprising the steps of:
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using a torque sensor mounted on a crankshaft of an internal combustion engine to measure a torque of said internal combustion engine and generate a torque signal therefrom; sampling said torque signal speed-synchronously; performing a weighted averaging of the torque signal with a weighting function which cancels or damps an influence of sinusoidal variations of said torque signal with frequencies equal to a selection of integer or half-integer multiples of a speed of said internal combustion engine; wherein; said selection of speed multiples is substantially dependent on a number of cylinders of the internal combustion engine; and said detection is based on a result of said averaging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device for detection of misfiring of an internal combustion engine comprising:
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a torque sensor mounted on a crankshaft of an internal combustion engine, for measurement of a torque of the internal combustion engine where a torque signal from said torque sensor is sampled speed-synchronously; wherein; a weighted averaging of the torque signal is performed with a weighted function which cancels or damps the influence from sinusoidal variations of the torque signal with frequencies equal to a selection of integers or half-integer multiples of the speed of the internal combustion engine; the selection of said speed multiples is substantially dependent on the number of cylinders of the internal combustion engine; and the detection is based on a result of said averaging. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification