Apparatus for controlling ignition timing for internal combustion engines
First Claim
1. An ignition timing control apparatus for an internal combustion engine comprising:
- a vibration sensor for detecting vibrations of said engine including knocking vibrations;
a knock detecting device for discriminating said knock vibrations by comparing the output of said vibration sensor with a predetermined level signal;
means for controlling ignition timing based on the output of said knock detecting device;
checking means for checking the detection sensitivity of said knock detecting device;
checking ignition timing generating means operable during the checking operation of said checking means for generating predetermined checking ignition timing, for at least one cylinder of said internal combustion engine, preset for the purpose of sensitivity check of said knock detecting device instead of generating a normal ignition timing obtained based on the output of said knock detecting device; and
means for correcting the sensitivity of said knock detecting device by checking by said checking means the reaction of said knock detecting device when ignition occurs by said checking ignition timing.
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Accused Products
Abstract
An ignition timing control apparatus for an internal combustion engine wherein an ignition timing θ of at least one cylinder of the engine is retarded (or advanced) by a little amount Δα to intentionary check the generation sensitivity of a knock detection signal, that is, the detection sensitivity of knocking, then a knock judging level is modified thereby to judge as to whether knock is produced or not on the basis of the modified knock judging level, in order to correct and control the ignition timing θ of the engine. As a result, irrespective of the non-uniformity of properties of the knock detection device and an internal combustion engine due to the deterioration with age or manufacturing errors, correct judgement of knocking can always be insured.
17 Citations
12 Claims
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1. An ignition timing control apparatus for an internal combustion engine comprising:
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a vibration sensor for detecting vibrations of said engine including knocking vibrations; a knock detecting device for discriminating said knock vibrations by comparing the output of said vibration sensor with a predetermined level signal; means for controlling ignition timing based on the output of said knock detecting device; checking means for checking the detection sensitivity of said knock detecting device; checking ignition timing generating means operable during the checking operation of said checking means for generating predetermined checking ignition timing, for at least one cylinder of said internal combustion engine, preset for the purpose of sensitivity check of said knock detecting device instead of generating a normal ignition timing obtained based on the output of said knock detecting device; and means for correcting the sensitivity of said knock detecting device by checking by said checking means the reaction of said knock detecting device when ignition occurs by said checking ignition timing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification