IGNITION DEVICE, INTERNAL COMBUSTION ENGINE AND PURIFICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an ignition device capable of controlling ignition timing of mixture gas containing hydrocarbon compounds and oxygen.SOLUTION: An ignition device 20 comprises: an ignition section 22 which has catalyst metal and allows mixture gas containing hydrocarbon compounds and oxygen to ignite with reaction heat produced through oxidation reaction of the mixture gas on a surface of the catalyst metal; and an electrification device 31 which applies electric charge to the catalyst metal. When allowing the mixture gas to ignite, the electrification device 31 sets a charge amount of the catalyst metal within a range not less than a first threshold value and not more than a second threshold value which is larger than the first threshold value. When inhibiting ignition of the mixture gas, the electrification device 31 sets the charge amount of the catalyst metal in the range less than the first threshold value or larger than the second threshold value.