An object of the disclosure is to prevent the sensing accuracy of an exhaust gas sensor from being deteriorated by the effect of electromagnetic waves in an exhaust gas purification system for an internal combustion engine that is configured to apply electromagnetic waves to the exhaust gas purification device provided in an exhaust passage of the internal combustion engine. The disclosure is applied to an exhaust gas purification system for an internal combustion engine including an exhaust gas sensor located within the range of radiation of electromagnetic waves from a radiating device that radiates electromagnetic waves of a specific frequency to an exhaust gas purification device. The system suspends the radiation of electromagnetic waves from the radiating device during a sampling period in which sampling of the output value of the exhaust gas sensor is performed, even when a specific condition for performing the radiation is met.

An object of the disclosure is to prevent the sensing accuracy of an exhaust gas sensor from being deteriorated by the effect of electromagnetic waves in an exhaust gas purification system for an internal combustion engine that is configured to apply electromagnetic waves to the exhaust gas purification device provided in an exhaust passage of the internal combustion engine. The disclosure is applied to an exhaust gas purification system for an internal combustion engine including an exhaust gas sensor located within the range of radiation of electromagnetic waves from a radiating device that radiates electromagnetic waves of a specific frequency to an exhaust gas purification device. The system suspends the radiation of electromagnetic waves from the radiating device during a sampling period in which sampling of the output value of the exhaust gas sensor is performed, even when a specific condition for performing the radiation is met.

The present disclosure describes a method for checking the signal of a temperature sensor in an exhaust-gas aftertreatment system for an internal combustion engine. The method may include: in an operating state which does not require heating of the reducing agent, activating the heating device for the purposes of checking the temperature sensor; determining whether the signal of the temperature sensor changes by a predefined expected value (T) within a predefined time period (t2); provisionally identifying the temperature sensor as fault-free if it does; deactivating the heating device; determining whether the signal of the temperature sensor reaches the start temperature (T0) again within a time period (t3); and confirming the temperature sensor as fault-free if it does.

A microwave applicator includes a housing configured to contain an object of heating, multiple microwave resonators provided on and around a periphery of the housing, a microwave conductor interconnecting the microwave resonators, and a microwave generator configured to generate microwaves of different frequencies. Each microwave resonator is configured to resonate the generated microwaves of a resonant frequency of the microwave resonator, and to emit the resonated microwaves to the object of heating contained in the housing. Among the microwave resonators, a first microwave resonator and a second microwave resonator have respective resonant frequencies that are different from each other.

A microwave applicator includes a housing configured to contain an object of heating, multiple microwave resonators provided on and around a periphery of the housing, a microwave conductor interconnecting the microwave resonators, and a microwave generator configured to generate microwaves of different frequencies. Each microwave resonator is configured to resonate the generated microwaves of a resonant frequency of the microwave resonator, and to emit the resonated microwaves to the object of heating contained in the housing. Among the microwave resonators, a first microwave resonator and a second microwave resonator have respective resonant frequencies that are different from each other.

A system includes an exhaust conduit coupled, at least first end of the exhaust conduit, to an internal combustion; a catalytic converter coupled to a second end of the exhaust conduit; and electromagnetic wave source configured to emit electromagnetic energy; and a wave guide, coupled at a first end to the electromagnetic wave source and at a second end to the exhaust conduit, and extending between the electromagnetic wave source and the exhaust conduit. The electromagnetic wave source is configured to provide the electromagnetic energy, via the wave guide, to exhaust gas traveling through the exhaust conduit.

A particulate filter includes a particulate capturing body configured to capture particulates contained in exhaust gas, and a dielectric waveguide provided around the particulate capturing body. The effective relative permittivity of the dielectric waveguide is higher than the effective relative permittivity of the particulate capturing body.

A particulate filter includes a particulate capturing body configured to capture particulates contained in exhaust gas, and a dielectric waveguide provided around the particulate capturing body. The effective relative permittivity of the dielectric waveguide is higher than the effective relative permittivity of the particulate capturing body.

Provided is a plasma reactor capable of reliably generating plasma even in the event of inflow of water. The plasma reactor of the present invention includes a plasma panel stack 20, electrically conductive members 51 and 54, a case, and a mat 71. The plasma panel stack 20 has a structure in which electrode panels 30 are stacked, and generates plasma upon application of voltage between the adjacent electrode panels 30. The electrically conductive members 51 and 54 are electrically connected to discharge electrodes of the electrode panels 30. The case houses the plasma panel stack 20. The mat 71 intervenes between the case and the plasma panel stack 20 and fixes the plasma panel stack 20 to the case. The mat 71 is disposed apart from the electrically conductive members 51 and 54 so that gaps S1 and S2 are formed between the mat 71 and the electrically conductive members 51 and 54, respectively.

A fine particle detector includes an antenna, an electromagnetic wave generator configured to supply electromagnetic waves to the antenna, an electromagnetic wave detector configured to detect reflected waves of the electromagnetic waves emitted from the antenna, and a controller configured to estimate, based on intensities of the reflected waves detected by the electromagnetic wave detector, an accumulated amount of fine particles.