IGNITION APPARATUS OF INTERNAL COMBUSTION ENGINE
First Claim
1. An ignition apparatus of an internal combustion engine comprising:
- an ignition plug including;
an insulator having a cylindrical shape,a center electrode having a rod-shape, being supported in the insulator to be coaxial therewith, in which a tip end of the center electrode is exposed therefrom,a housing that supports the insulator,a ground electrode connected to the housing, forming a discharge gap between the tip end of the center electrode and the ground electrode, anda pocket constituted of a space formed between an outer periphery surface of a tip end of the insulator and an inner periphery surface of the housing, in which a portion in a tip end side of the pocket is opened;
an AC (alternating current) voltage application unit configured to apply AC voltage to the center electrode; and
an application voltage control unit that controls an operation of the AC voltage application unit, whereinthe application voltage control unit is configured to control the AC voltage application unit to apply the center electrode with a first AC voltage having an amplitude which is smaller than that of a required voltage of the ignition plug in a first period which is before an ignition timing, and to apply the center electrode with a second AC voltage having an amplitude smaller than that of the first AC voltage or to stop applying the center electrode with the AC voltage during a second period which is before the ignition timing after the first period has elapsed.
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Accused Products
Abstract
An ignition apparatus of an internal combustion engine is provided with an ignition plug, an AC (alternating current) voltage application unit configured to apply AC voltage to the center electrode of the ignition plug, and an application voltage control unit that controls an operation of the AC voltage application unit. The application voltage control unit is configured to control the AC voltage application unit to apply the center electrode with a first AC voltage having an amplitude smaller than that of a required voltage of the ignition plug in a first period which is before an ignition timing, and to apply the center electrode with a second AC voltage having an amplitude smaller than that of the first AC voltage or to stop applying the center electrode with the AC voltage during a second period which is before the ignition timing after the first period has elapsed.
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Citations
9 Claims
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1. An ignition apparatus of an internal combustion engine comprising:
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an ignition plug including; an insulator having a cylindrical shape, a center electrode having a rod-shape, being supported in the insulator to be coaxial therewith, in which a tip end of the center electrode is exposed therefrom, a housing that supports the insulator, a ground electrode connected to the housing, forming a discharge gap between the tip end of the center electrode and the ground electrode, and a pocket constituted of a space formed between an outer periphery surface of a tip end of the insulator and an inner periphery surface of the housing, in which a portion in a tip end side of the pocket is opened; an AC (alternating current) voltage application unit configured to apply AC voltage to the center electrode; and an application voltage control unit that controls an operation of the AC voltage application unit, wherein the application voltage control unit is configured to control the AC voltage application unit to apply the center electrode with a first AC voltage having an amplitude which is smaller than that of a required voltage of the ignition plug in a first period which is before an ignition timing, and to apply the center electrode with a second AC voltage having an amplitude smaller than that of the first AC voltage or to stop applying the center electrode with the AC voltage during a second period which is before the ignition timing after the first period has elapsed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification