Exhaust gas cleaner

Abstract

Provided are a hollow inner electrode 5 constituted by an electrically conductive filter capable of capturing particulates, a cylindrical outer electrode 6 circumferentially surrounding the electrode 5, a housing 4 incorporated in a flow passage of exhaust G and accommodating the electrodes 5 and 6, a temperature sensor 2 for detecting temperature of the exhaust G and an electric discharge controller 3 for controlling electric power to be distributed to the electrodes 5 and 6 on the basis of a detected value of the temperature sensor 2 . When the temperature of the exhaust G obtained by the temperature sensor 2 is lowered, electric power necessary for generation of discharge plasma is distributed by the discharge controller 3 to the electrodes 5 and 6, thereby oxidizing the particulates captured by the electrode 5 to reduce electricity consumption.

Description

technical field [0001] The invention relates to an exhaust purification device. Background technique [0002] Diesel engine exhaust (diesel combustion gas) contains carbonaceous coal and SOF (Soluble Organic Fraction: soluble organic fraction) composed of carbonaceous hydrocarbon components as main components, and a small amount of sulfuric acid is added Particles (Particulate Matter: particulate matter) composed of salt (fog-like sulfuric acid component). [0003] In order to suppress the diffusion of such particles into the atmosphere, a filter for collecting particles is often installed in the exhaust system of the engine. [0004] As an example of such a particulate filter, there is a form in which a honeycomb mandrel is formed of ceramics such as cordierite, and exhaust gas from an engine flows through a plurality of passages separated by porous thin walls of the honeycomb mandrel. [0005] In the above-mentioned particulate filter, every other end portion of a plural...

AI Technical Summary

Problems solved by technology

[0015] However, in the conventional plasma-assisted exhaust purification device, if a high voltage is always applied to the inner electrode and the outer electrode, the power consumption will be excessively large.

[0016] In addition, when the electric power for discharging is alternating current, a circuit in which a high voltage is applied to a capacitor composed of outer and inner electrodes is regarded as an equivalent circuit. Changes in components, etc., so the reactance of the circuit can be expected to fluctuate, resulting in deviations in the voltage waveform and current waveform, and power reduction

[0017] Moreover, in the conventional plasma-assisted exhaust purification device, it is not possible to grasp how many particles are actually collected.

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