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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTakashi Hisaki, Yuichi Shimasaki, Shigeki Baba, Masaki Kanehiro, Takuji Ishioka, Shigeru Maruyama, Kazuhito Kakimoto, Masataka Chikamatsu, Shukoh Terata, Kenichi Maeda
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A misfire-detecting system for an internal combustion engine carries out self-diagnosis of the system. In the system, sparking voltage generated across a spark plug of a cylinder of the engine is detected, and the detected sparking voltage is compared with a first predetermined reference voltage value, and a time period is measured over which the detected sparking voltage exceeds the first predetermined reference voltage value. It is determined that a misfire occurred in the engine when the measured time period exceeds a predetermined time period value. It is determined whether the engine is in self-sustaining operation. When it is determined that the engine is in self-sustaining operation, it is determined whether the misfire-detecting system is abnormal. It is determined that the misfire-detecting system is abnormal when the detected sparking voltage is lower than a second reference voltage value. Alternatively or in combination, it is determined that the misfire-detecting system is abnormal when the detected sparking voltage has continued to be higher than a third predetermined reference voltage value over a predetermined time period.
In a misfire-detecting system for an internal combustion engine having at least one cylinder, and a spark plug provided in each of said at least one cylinder, said system including engine operating condition-detecting means for detecting values of operating parameters of said engine, signal-generating means for determining ignition timing of said engine, based upon values of operating parameters of said engine detected by said engine operating condition-detecting means for generating an ignition command signal indicative of the determined ignition timing, igniting means responsive to said ignition command signal for generating high voltage for causing generation of sparking voltage across said spark plug for discharging said spark plug, voltage value-detecting means for detecting a value of said sparking voltage generated across said spark plug when said high voltage is generated by said igniting means, comparing means for comparing the detected value of said sparking voltage with a first predetermined reference voltage value, measuring means for measuring a time period over which the detected value of said sparking voltage exceeds said first predetermined reference voltage value, and misfire-determining means for determining that a misfire has occurred in said engine when the measured time period exceeds a predetermined time period value, the improvement comprising:
In a misfire-detecting system for an internal combustion engine having at least one cylinder, and a spark plug provided in each of said at least one cylinder, said system including engine operating condition-detecting means for detecting values of operating parameters of said engine, signal-generating means for determining ignition timing of said engine, based upon values of operating parameters of said engine detected by said engine operating condition-detecting means and for generating an ignition command signal indicative of the determined ignition timing, igniting means responsive to said ignition command signal for generating high voltage for causing generation of sparking voltage across said spark plug for discharging said spark plug, and voltage value-detecting means for detecting a value of said sparking voltage generated across said spark plug when said high voltage is generated by said igniting means, the improvement comprising:
In a misfire-detecting system for an internal combustion engine having at least one cylinder, and a spark plug provided in each of said at least one cylinder, the improvement comprising:
Dependencies are inferred from the claim text.