INTERNAL COMBUSTION ENGINE SYSTEM, VEHICLE HAVING THE INTERNAL COMBUSTION ENGINE SYSTEM, AND ENGINE MISFIRE DETECTION METHOD FOR INTERNAL COMBUSTION ENGINE
First Claim
1. An internal combustion engine system having a multi-cylinder internal combustion engine that is connected to a drive shaft via a torsion element and includes an exhaust gas recirculation device which performs introduction of part of the exhaust into a gas intake line, the internal combustion engine system comprising:
- a rotational position detector that detects a rotational position of an output shaft of the internal combustion engine;
a rotational fluctuation computation module that computes a rotational fluctuation of the output shaft at every specific rotational angle from the detected rotational position of the output shaft; and
an engine misfire detection module that makes detection on occurrence or non-occurrence of a misfire in any of the cylinders of the internal combustion engine based on a first angle difference that is a difference corresponding to a first preset angle of the computed rotational fluctuations when the introduction of part of the exhaust into the gas intake line is not performed by the exhaust gas recirculation device, and makes detection on the occurrence or the non-occurrence of a misfire in any of the cylinders of the internal combustion engine based on the first angle difference and a second angle difference that is a difference corresponding to a second preset angle smaller than the first preset angle of the computed rotational fluctuations when the introduction of part of the exhaust into the gas intake line is performed by the exhaust gas recirculation device.
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Accused Products
Abstract
The internal combustion engine system makes detection on the occurrence or the non-occurrence of a misfire by comparing the 240-degree difference TD240 of the 30-degree rotation time T30 (CA) with the tentative detection reference value A1 and comparing the detection base difference ratios J1 and J5 with the ranges of the respective reference values B11, B12, B51 and B52 when the exhaust gas recirculation is performed, in addition to the methodology in the non-performance of the exhaust gas recirculation, that is, in addition to the methodology of comparing the 360-degree difference TD360 of the 30-degree rotation time T30 (CA) with the tentative detection reference value A1 and comparing the detection base difference ratios J0, J2 and J4 with the ranges of the respective reference values B01, B02, B21, B22, B41 and B42 (S410, S440). This arrangement enables to detect a misfire in any of cylinders of the engine 22 accurately even when the exhaust gas recirculation is performed or not performed.
36 Citations
10 Claims
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1. An internal combustion engine system having a multi-cylinder internal combustion engine that is connected to a drive shaft via a torsion element and includes an exhaust gas recirculation device which performs introduction of part of the exhaust into a gas intake line, the internal combustion engine system comprising:
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a rotational position detector that detects a rotational position of an output shaft of the internal combustion engine; a rotational fluctuation computation module that computes a rotational fluctuation of the output shaft at every specific rotational angle from the detected rotational position of the output shaft; and an engine misfire detection module that makes detection on occurrence or non-occurrence of a misfire in any of the cylinders of the internal combustion engine based on a first angle difference that is a difference corresponding to a first preset angle of the computed rotational fluctuations when the introduction of part of the exhaust into the gas intake line is not performed by the exhaust gas recirculation device, and makes detection on the occurrence or the non-occurrence of a misfire in any of the cylinders of the internal combustion engine based on the first angle difference and a second angle difference that is a difference corresponding to a second preset angle smaller than the first preset angle of the computed rotational fluctuations when the introduction of part of the exhaust into the gas intake line is performed by the exhaust gas recirculation device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An engine misfire detection method of detecting a misfire of a multi-cylinder internal combustion engine in an internal combustion engine system, the internal combustion engine is connected to a drive shaft via a torsion element and includes an exhaust gas recirculation device which performs introduction of part of the exhaust into a gas intake line,
the engine misfire detection method comprising the steps of: -
(a) computing a rotational fluctuation of an output shaft of the internal combustion engine at every specific rotational angle from a rotational position of the output shaft; and (b) making detection on occurrence or non-occurrence of a misfire in any of the cylinders of the internal combustion engine based on a first angle difference that is a difference corresponding to a first preset angle of the computed rotational fluctuations when the introduction of part of the exhaust into the gas intake line is not performed by the exhaust gas recirculation device, and making detection on the occurrence or the non-occurrence of a misfire in any of the cylinders of the internal combustion engine based on the first angle difference and a second angle difference that is a difference corresponding to a second preset angle smaller than the first preset angle of the computed rotational fluctuations when the introduction of part of the exhaust into the gas intake line is performed by the exhaust gas recirculation device. - View Dependent Claims (10)
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Specification