ROTATIONAL FLUCTUATION MALFUNCTION DETECTION DEVICE AND ROTATIONAL FLUCTUATION MALFUNCTION DETECTION METHOD FOR INTERNAL COMBUSTION ENGINE
First Claim
1. A rotational fluctuation malfunction detection device for an internal combustion engine that serves as a power source for a vehicle, the rotational fluctuation malfunction detection device, comprising:
- a parameter obtaining device that is configured to obtain a value of a fluctuation parameter that indicates a degree of non-uniformity in fluctuation of rotational speed of the output shaft of the internal combustion engine;
an automatic engine stop device that is configured to stop the internal combustion engine when an engine stop condition including that the vehicle is stopped is satisfied; and
a signal output device that is configured to output a signal that indicates a determination result of whether the degree of non-uniformity of fluctuation of the rotational speed is normal or not based on the value of the fluctuation parameter obtained in the operation of the internal combustion engine,wherein if the value of the fluctuation parameter obtained during a disturbance fluctuation state, in which the rotational speed of the output shaft of the internal combustion engine fluctuates due to disturbances from the driving wheel, is below a first threshold value, the signal output device outputs a signal that indicates the determination result based on the value of the fluctuation parameter obtained in the disturbance fluctuation state, andif the value of the fluctuation parameter obtained in the disturbance fluctuation state equals or exceeds the first threshold value, the signal output device outputs a signal that indicates the determination results based on the value of the fluctuation parameter obtained in a non-disturbance fluctuation state, in which rotational speed of the output shaft of the internal combustion engine does not fluctuate as a result of disturbances from the driving wheel of the vehicle, instead of the value of the fluctuation parameter obtained in the disturbance fluctuation state.
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Accused Products
Abstract
A rotational fluctuation malfunction detection device for an internal combustion engine determines that fluctuations in output shaft rotational speed are “normal” when a rotational fluctuation value, obtained in a “disturbance fluctuation state” is below threshold L1. If rotational fluctuation value obtained in “disturbance fluctuation state” equals or exceeds L2, the rotational fluctuation malfunction detection device determines that the rotational fluctuation value is “abnormal.” However, when the rotational fluctuation value obtained in “disturbance fluctuation state” is equal to L1 or between L1 and L2, the rotational fluctuation malfunction detection device determines that the rotational fluctuation value is “normal” if the rotational fluctuation value obtained in the “non-disturbance state” is below L3, and the rotational fluctuation value is “abnormal” if the rotational fluctuation value obtained in the “non-disturbance state” equals or exceeds L3.
14 Citations
13 Claims
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1. A rotational fluctuation malfunction detection device for an internal combustion engine that serves as a power source for a vehicle, the rotational fluctuation malfunction detection device, comprising:
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a parameter obtaining device that is configured to obtain a value of a fluctuation parameter that indicates a degree of non-uniformity in fluctuation of rotational speed of the output shaft of the internal combustion engine; an automatic engine stop device that is configured to stop the internal combustion engine when an engine stop condition including that the vehicle is stopped is satisfied; and a signal output device that is configured to output a signal that indicates a determination result of whether the degree of non-uniformity of fluctuation of the rotational speed is normal or not based on the value of the fluctuation parameter obtained in the operation of the internal combustion engine, wherein if the value of the fluctuation parameter obtained during a disturbance fluctuation state, in which the rotational speed of the output shaft of the internal combustion engine fluctuates due to disturbances from the driving wheel, is below a first threshold value, the signal output device outputs a signal that indicates the determination result based on the value of the fluctuation parameter obtained in the disturbance fluctuation state, and if the value of the fluctuation parameter obtained in the disturbance fluctuation state equals or exceeds the first threshold value, the signal output device outputs a signal that indicates the determination results based on the value of the fluctuation parameter obtained in a non-disturbance fluctuation state, in which rotational speed of the output shaft of the internal combustion engine does not fluctuate as a result of disturbances from the driving wheel of the vehicle, instead of the value of the fluctuation parameter obtained in the disturbance fluctuation state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A rotational fluctuation malfunction detection device for an internal combustion engine that serves as a power source for a vehicle, the rotational fluctuation malfunction detection device comprising:
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a parameter obtaining device that is configured to obtain the value of fluctuation parameter that indicates the degree of non-uniformity of fluctuation in rotational speed of an output shaft of the internal combustion engine; an automatic engine stop device that is configured to stop the internal combustion engine when an engine stop condition including that the vehicle is stopped is satisfied; and a signal output device that is configured to output a signal that indicates a determination result of whether the degree of non-uniformity of fluctuation of the rotational speed is normal based on the value of the fluctuation parameter obtained by the parameter obtaining device when the engine is in operation, wherein the signal output device outputs a signal that indicates the determination result based on the value of the fluctuation parameter obtained in at least one of disturbance fluctuation states in which the rotational speed of the output shaft of the internal combustion engine fluctuates as a result of disturbances from a driving wheel of the vehicle to which driving torque of the output shaft of the internal combustion engine is transmitted, and also outputs the signal that indicates the determination result based on the fluctuation parameter value obtained in a non-disturbance state in which the rotational speed of the output shaft of the internal combustion engine does not fluctuate as a result of disturbances from the driving wheel of the vehicle, and when the internal combustion engine is in a lean imbalanced state in which a fuel injection valve for a part of a plurality of cylinders sprays a smaller amount of fuel than specified, the signal output device does not output the signal that indicates the determination result in the disturbance fluctuation state but does output the signal that indicates the determination result in the non-disturbance state.
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12. A method of detecting rotational fluctuation malfunctions in an internal combustion engine that serves as a power source for a vehicle, the method comprising:
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obtaining the value of fluctuation parameter that indicates the degree of non-uniformity of fluctuation in rotational speed of an output shaft of the internal combustion engine; outputting a signal that indicates a determination result of whether the degree of non-uniformity of fluctuation of the rotational speed is abnormal based on the value of the fluctuation parameter obtained during a disturbance fluctuation state, in which disturbances from a driving wheel, to which driving torque of the output shaft of the internal combustion engine is transmitted, cause fluctuations in the rotational speed of the output shaft of the internal combustion engine, and a non-disturbance state, in which disturbances from the driving wheel do not cause fluctuations in the rotational speed of the output shaft, wherein the determination result is based on the fluctuation parameter value obtained during the disturbance fluctuation state if the fluctuation parameter value obtained in the disturbance fluctuation state is below a first threshold value, and the determination result is based on the fluctuation parameter value obtained during the disturbance fluctuation state if the fluctuation parameter value obtained in the non-disturbance fluctuation state if the fluctuation parameter value obtained in the disturbance fluctuation state equals or exceeds the first threshold value.
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13. A method of detecting rotational fluctuation malfunctions in an internal combustion engine that serves as a power source for a vehicle, comprising:
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obtaining the value of fluctuation parameter that indicates the degree of non-uniformity of fluctuation in rotational speed of an output shaft of an internal combustion engine; outputting a signal that indicates a determination result of whether the degree of non-uniformity of fluctuation of the rotational speed is abnormal based on the value of the fluctuation parameter obtained during at least one of a disturbance fluctuation state, in which disturbances from a driving wheel, to which driving torque of the output shaft of the internal combustion engine is transmitted, cause fluctuations in the rotational speed of the output shaft, and a non-disturbance state, in which disturbances from a driving wheel, to which driving torque of the output shaft of the internal combustion engine is transmitted, does not cause fluctuations in the rotational speed of the output shaft, from a signal output device, wherein the signal that indicates the determination result based on the fluctuation parameter value obtained during the non-disturbance state if the internal combustion engine is in a lean imbalanced state, in which a fuel injection amount injected by at least one fuel injection valve is below a target fuel injection amount.
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Specification