Ignition timing control apparatus for internal combustion engine
First Claim
1. An ignition timing control apparatus for an internal combustion engine having a reference ignition timing comprising:
- sensing means for sensing vibrations including knocks of said engine;
knock signal deriving means for deriving knock signals from the output of said sensing means;
correction magnitude determining means for determining from said knock signals derived by said knock signal deriving means an ignition timing correction magnitude for suppressing the occurrence of knock;
displacement magnitude determining means for determining from at least one of an output of said knock signal deriving means and an output of said correction magnitude determining means a displacement magnitude for said reference ignition timing corresponding to the octane rating of a fuel used in said engine; and
ignition timing determining means for setting the reference ignition timing at an optimum ignition timing angle for said engine responsive to the correction magnitude determined by said correction magnitude determining means and the displacement magnitude determined by said displacement magnitude determining means.
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Accused Products
Abstract
An ignition timing control apparatus for an internal combustion engine capable of using as a fuel a regular (low-octane) gasoline, a premium (high-octane) gasoline, or a mixture of both type of gasolines. The engine produces knocks when the ignition timing is advanced beyond a reference ignition timing determined as a function of the type of gasoline being used. This advance ignition timing control apparatus detects the knocks, and provides as an output therefrom a signal according to the occurrence rate of the knocks which essentially indicates the type of gasoline in use. By means of this signal, this ignition timing control apparatus continuously displaces the reference ignition timing in the direction of retard angle by using a proportion factor calculator and an interpolator. At the same time, the displaced reference ignition timing is corrected by the detected knock signals on a real time basis. The combined ignition timing signal serves to energize an ignition coil to suppress the occurrence of knocks. This operation will continue until no knocks occur.
10 Citations
31 Claims
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1. An ignition timing control apparatus for an internal combustion engine having a reference ignition timing comprising:
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sensing means for sensing vibrations including knocks of said engine; knock signal deriving means for deriving knock signals from the output of said sensing means; correction magnitude determining means for determining from said knock signals derived by said knock signal deriving means an ignition timing correction magnitude for suppressing the occurrence of knock; displacement magnitude determining means for determining from at least one of an output of said knock signal deriving means and an output of said correction magnitude determining means a displacement magnitude for said reference ignition timing corresponding to the octane rating of a fuel used in said engine; and ignition timing determining means for setting the reference ignition timing at an optimum ignition timing angle for said engine responsive to the correction magnitude determined by said correction magnitude determining means and the displacement magnitude determined by said displacement magnitude determining means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An ignition timing control apparatus for an internal combustion engine comprising:
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sensing means for sensing vibrations including knocks of said engine; knock signal deriving means for deriving knock signals from the output of said sensing means; means for generating reference ignition timing signals; displacement magnitude determining means for determining from an output of said knock signal deriving means a displacement magnitude for said reference ignition timing signals corresponding to the octane rating of a fuel used in said engine; ignition timing determining means for determining ignition timing of said engine responsive to the output of said displacement magnitude determining means, said ignition timing determining means including an interpolating operation means for performing an interpolating operation between two reference ignition timing characteristics according to a proportional factor corresponding to the octane rating of said fuel.
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30. An ignition timing control apparatus for an internal combustion engine comprising;
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sensing means for sensing vibrations including knocks of said engine; knock signal deriving means for deriving knock signals from the output of said sensing means and producing an output; means for generating reference ignition timing signals; displacement magnitude determining means for determining from an output of said knock signal deriving means a displacement magnitude for said reference ignition timing corresponding to the octane rating of a fuel used in said engine; ignition timing determining means for determining ignition timing of said engine responsive to the output of said displacement magnitude determining means, and said ignition timing determining means including an ignition timing operating means for phase-shifting the reference ignition timing signals in response to the output of said displacement magnitude determining means.
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31. An ignition timing control apparatus for an internal combustion engine comprising:
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sensing means for sensing vibrations including knocks of said engine; knock signal deriving means for deriving knock signals from the output of said sensing means; means for generating reference ignition timing signals; displacement magnitude determining means for determining from an output of said knock signal deriving means a displacement magnitude for said reference ignition timing corresponding to the octane rating of a fuel used in said engine; ignition timing determining means for determining ignition timing responsive to the output of said displacement magnitude determining means; and said displacement magnitude determining means including a reset circuit for initializing the reference ignition timing to a predetermined value.
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Specification