Apparatus for determining detonation for internal combustion engine
A technology for judging devices and internal combustion engines, applied in measuring devices, engine testing, machine/structural component testing, etc., can solve problems such as thermal efficiency reduction, internal combustion engine temperature rise, internal combustion engine output reduction, etc., to achieve the effect of shortening the time
Inactive Publication Date: 2005-01-26
FUJITSU GENERAL LTD
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Problems solved by technology
In an internal combustion engine, when knocking occurs, the pressure applied to the piston is irregular, not only the operation of the internal combustion engine is irregular, but also the temperature of the internal combustion engine rises, the thermal efficiency decreases, and the output of the internal combustion engine decreases
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[0030] FIG. 1 is a block diagram schematically showing the structure of a knock detection device 10 for an internal combustion engine according to an embodiment of the present invention, figure 2 It is a system diagram schematically showing the configuration of an internal combustion engine 11 provided with a knock detection device 10 for an internal combustion engine shown in FIG. 1 .
[0031]The knocking judging device 10 of an internal combustion engine (hereinafter referred to simply as a knocking judging device) includes a vibration sensor 12 for detecting knocking of the internal combustion engine 11, a crank angle sensor 13 for detecting the rotational angle position of a crankshaft of the internal combustion engine 11, and a variable filter frequency band sensor. The filter 14 that filters out the detection output of the vibration sensor 12, the output of the response filter 14, and the level discrimination unit 15 of the output of the output of the filter 14 is distin...
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A knock determining apparatus for internal combustion engine to enhance knocking detection accuracy by determining a deviation of a resonance frequency by a simple determination means and correcting the deviation of the resonance frequency based on the determined result. A detection output of a knock sensor 12 for detecting knocking of the internal combustion engine 11 is filtered by a filter 14 which is variable in a filter frequency band, and an output of the filter 14 is discriminated with a determination level previously set by a level discrimination means 15. A counter 16 counts the number of times c in which the detection output of the knock sensor 12 is more than the determination level, and the determination means 17 determines presence or absence of the knocking based on the number of times c. When the presence or absence of the knocking can not be determined in response to the output of the determination means 17, a correction means 18 carries out correction so as to deviate the filter frequency band of the filter 14, whereby the presence or absence of the knocking can be determined, thereby enhancing the knocking detection accuracy.
Description
technical field [0001] The present invention relates to a knock judging device extremely suitable for use in ignition control of an internal combustion engine and the like. Background technique [0002] The higher the compression ratio of the gas mixture, the higher the output of the spark ignition internal combustion engine can be obtained. However, when the compression ratio is increased, after the gas mixture sucked into the gas cylinder is spark-ignited, the flame may appear before the flame while propagating in the gas cylinder. A so-called detonation occurs where the unburned gas explodes. In the internal combustion engine, when knocking occurs, the pressure applied to the piston is irregular, not only the operation of the internal combustion engine is irregular, but also the temperature of the internal combustion engine rises, the thermal efficiency decreases, and the output of the internal combustion engine decreases. Therefore, in an internal combustion engine, it ...
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IPC IPC(8): G01M15/00F02D45/00G01L23/22
CPCG01L23/225F02D45/00
Inventor 西村淳也
Owner FUJITSU GENERAL LTD