Exhaust gas cleaner

An exhaust purification device and electrode technology, which is applied in the direction of exhaust devices, noise reduction devices, chemical instruments and methods, etc., can solve the problems of voltage waveform and current waveform deviation, non-implemented control collection, large power consumption, etc., and achieve reactance change Reduce, achieve energy utilization, and reduce the effect of digesting power

Inactive Publication Date: 2008-05-21
HINO MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] 1 and 2 show the first embodiment of the exhaust gas purification device of the present invention. This exhaust gas purification device is equipped with a collection chamber 1, a temperature sensor 2, and a discharge control unit 3.

[0080] The collection chamber 1 is equipped with: a housing 4 assembled in the flow path of the exhaust gas G to be purified; a hollow inner electrode 5 formed by a conductive filter that can collect particulates, and in the housing 4 A cylindrical outer electrode 6 is arranged inside the housing 4 so as to surround the inner electrode 5 in the circumferential direction; a dielectric body 7, such as ceramic, which covers the outer electrode 6 The inner surface.

[0081] Furthermore, in the flow path of the exhaust gas G, a particulate filter to which cordierite or the like is applied is installed separately from the collection chamber 1.

[0082] As the above-mentioned conductive filter, there is a form in which fibrous metals are laminated an...

Embodiment 2

[0097] Figures 3 to 5 show a second embodiment of the exhaust purification device of the present invention. This exhaust purification device is equipped with a collection chamber 1, a collection amount estimation mechanism 11, and a discharge control unit 12, a collection chamber 1, an on-board power supply 10 It has the same structure as shown in FIG. 1.

[0098] The collected amount estimation mechanism 11 measures the internal pressure of the housing 4, the electrical characteristics of the inner electrode 5 (voltage value, current value, and impedance value when energized) and other parameters, based on the collected amount of particles of the inner electrode 5 obtained through actual measurement in advance and Based on the correlation of the measured values ​​of the parameters, the amount of particles collected by the inner electrode 5 at that time is calculated.

[0099] An on-vehicle power supply 10 and a collection amount estimation mechanism 11 are connected to the discha...

Embodiment 3

[0111] Fig. 6 shows a third embodiment of the exhaust gas purification device of the present invention. This exhaust gas purification device is equipped with a collection chamber 21, a high-voltage output mechanism 22 that outputs alternating current for discharge, a plurality of inductors L1 to L6, and an inductance Control mechanism 23.

[0112] The collection chamber 21 is equipped with a pair of electrodes 24 and 25, which are arranged in the flow path of the exhaust gas G which is the object of purification; The filter constitutes the other electrode 25.

[0113] The shape of these electrodes 24 and 25 may be any of a cylindrical shape, a flat plate facing type, or a lattice type.

[0114] As the above-mentioned conductive filter, there is a form in which fibrous metals are laminated and sintered to be integrated, a form in which a sintered body of metal powder and a fine metal mesh are laminated and sintered, or by Sintering is a form in which metal powder is placed on a fine ...

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PUM

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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 gas purification device. Background technique [0002] The exhaust gas of diesel engines (combustion gas of diesel) contains coal composed of carbon and SOF (Soluble Organic Fraction) composed of high-boiling hydrocarbon components as the main components, and a trace amount of sulfuric acid is added. Particulate Matter (Particulate Matter: particulate matter) composed of salt (mist-like sulfuric acid component). [0003] In order to suppress the diffusion of such particulates into the atmosphere, a filter for collecting particulates 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 by ceramics such as cordierite, and engine exhaust gas flows through a plurality of passages divided by the porous thin wall of the honeycomb mandrel. [0005] In the above-mentioned particulate filter, every other end portion of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/01F01N3/02F01N3/08B01D46/42B03C3/49B03C3/68
CPCB03C3/366B03C2201/30B03C3/49
Inventor 下田正敏町田耕一古川卓俊
Owner HINO MOTORS LTD
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