JPS5985416A - Minute carbon particle purifying apparatus for engine - Google Patents

Abstract

PURPOSE:To purify exhaust gas by injecting fuel into an electrical dust collector for collecting minute carbon particles which is arranged in the exhaust gas passage of an engine and igniting said fuel and combusting the minute carbon particles collected on the dust collecting electrode of the electrical dust collector. CONSTITUTION:In the exhaust gas passage 2 of an engine, an electrical dust collector 3 for collecting minute carbon particles which consists of dust collecting electrodes 4 and 4' onto which high voltage is supplied from a high-voltage power source 10 and discharge electrodes 5 and 5'. Inside the electrical dust collector 3, a fuel pump 7 and an air pump 8 are connected, and a fuel injector 6 which gushes-out mixed gas for combustion and a ignitor 6 are installed on the upstream side from the dust collecting electrodes 4 and 4' and the discharge electrodes 5 and 5'. When a large amount of carbon is collected onto the dust collecting electrodes 4 and 4' and arc discharge is generated between the discharge electrodes 5 and 5', a spark detector 11 detects said arc discharge, and an electronic controller 13 operates the fuel pump 7, air pump 8, and the ignitor 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon particulate purification device for removing particulates mainly composed of carbon from exhaust gas in internal combustion engines such as automobiles. Fine particles as the main component (hereinafter referred to as carbon fine particles)
The present invention relates to a carbon particulate purification device, which is provided with an electrostatic precipitator for collecting carbon particles, and a purifying means for burning and purifying the carbon particulates collected by the electrostatic precipitator.

Conventionally, the installation of an electrostatic precipitator for collecting particulates in the exhaust gas passage of an engine has been proposed, for example, in Japanese Patent Publication No. 29-5744 or Japanese Patent Publication No. 40-2480.
Processing of the fine particles collected by electrostatic precipitators is difficult, and commercialization has been delayed.

The present invention has been made in consideration of the above points, and includes a fuel injection device for burning and purifying carbon particles, and an ignition device for igniting all of the fuel injected by the fuel injection device. A purification means is provided, and the carbon particulates collected on the dust collection electrode of the electrostatic precipitator are periodically combusted by the purification means, thereby efficiently purifying the carbon particulates in the exhaust gas. The purpose of the present invention is to provide a carbon particulate purification device suitable for engines such as automobiles.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 is the engine, 2 is the exhaust pipe of the engine 1, 3 is an electrostatic precipitator that is connected to the exhaust pipe 2 and collects carbon particles in the exhaust gas, and 4 and 4' are the electrostatic precipitator 3. Shumen Goku, 5,
5' is a discharge electrode, 6 is a fuel injection device that injects fuel into the electrostatic precipitator 3, 7 is a fuel pump that supplies liquid fuel to the fuel injection device 6, and 8 is a fuel injection device 6 that injects liquid fuel into the fuel injection device 6. 9 is an ignition device for igniting the fuel injected into the electrostatic precipitator 3 via the fuel injection device R6; 10 is the dust collecting electrode 4 of the electrostatic precipitator 3; 4' and a high voltage power supply that generates a high voltage to be applied between the discharge electrodes 5, 5'; A spark discharge detector 12 is an electromagnetic switch that detects the occurrence of a spark discharge (arc discharge). When the electromagnetic switch 12 is activated, high voltage is supplied from the high voltage power supply 10 to the ignition device R9, and the fuel is ignited. It will be done.

13 is an electronic control unit, 14 is a key switch, 15 is a battery, and 16 is a muffler.

Next, the operation of the above device will be explained. key switch 1
When the engine 1 is started, the high voltage power supply 10 is activated by the electronic control unit 13, and a high voltage is applied between the dust collection electrodes 4, 4' and the discharge electrodes 5, 5', and the electric dust collection starts. Unit 3 is activated. On the other hand, the exhaust gas of the engine 1 is introduced into the electrostatic precipitator 3 through the exhaust pipe 2, and the carbon particles in the exhaust gas are removed by the action of the electrostatic precipitator 3) on the surface of the dust collecting electrodes 4, 4'. is collected by.

Therefore, the exhaust gas discharged into the atmosphere through the muffler air 6 has harmful carbon particles removed.

By the way, when the engine I is operated for a long time, the dust collection electrode 4.4'
A large amount of fine carbon particles are deposited on the surface of the discharge electrode 5, 5', and the distance between the deposited fine carbon particles and the discharge electrodes 5, 5' becomes short, and a spark discharge occurs during this time. The discharge current due to this spark discharge is detected by a spark discharge detector 11, and the frequency of occurrence of spark discharge is further detected by an electronic control unit 13. When the amount of deposited carbon particles is large and the frequency of occurrence of spark discharge is higher than a predetermined value, the electronic control unit 13
The fuel pump 7 and air pump 8 are driven by
Fuel and air are injected into the electrostatic precipitator 3 from the fuel injection device 6 . On the other hand, the electromagnetic switch 12 is also driven, high voltage is supplied from the high voltage power supply 10 to the ignition device 9, and the fuel is ignited. In this way, the fuel injected into the electrostatic precipitator 3 reaches the dust collecting electrodes 4, 4' while burning.
Burn and purify the carbon particles deposited on 4'. After a predetermined period of time has elapsed, the operation of the fuel cylinder 7D7, air pump 8, and electromagnetic switch 12 is stopped, and the electrostatic precipitator 3 again collects the car in the exhaust gas. It has the effect of collecting fine particles.

In the above embodiment, the high voltage power supply 10 of the electric precipitator 3 is also used as the power supply of the ignition device 9, so that the cost can be reduced.

As described above, the device of the present invention includes an electrostatic precipitator that collects carbon particulates in exhaust gas in the exhaust gas passage of an engine, a fuel injection device that injects fuel into the electrostatic precipitator, and a fuel injection device that injects fuel into the electrostatic precipitator. A purifying means having an ignition device for igniting the fuel is provided, and the carbon particulates collected by the electrostatic precipitator are burned and purified by the ignited fuel. Therefore, the carbon particles in the exhaust gas can be efficiently purified. Furthermore, since the carbon particulates can be purified automatically, it can be applied to engines used by the general public, such as automobiles.

[Brief explanation of drawings]

The figure is a configuration diagram of the device of the present invention. l...engine, 2...exhaust pipe, 3...electrical collector,
4゜4'... Dust collection electrode, 5,5'... Discharge electrode, 6...
・Fuel injection device, 7...Fuel pump, 8...Air pump, 9...Ignition device, 10...High voltage power supply, 11
...Spark discharge detector, 12...Electronic switch, 13
...Electronic control device. Agent Makoto Kuzuno - Commissioner of the Japan Patent Office 1. Thing f! Mochi Q (', 1984-195
No. 050 No. 2 Name of the invention Carbon particle purification device of the organization 3 Person making the amendment Representative Katayama 1-8 Department 4 Agent 5, drawings subject to amendment. 6. Contents of the amendment The drawings will be corrected as if they were not attached. 7 Attachment 1 Catalog Screen 1 or more 1

Claims (3)

[Claims] (1) An electrostatic precipitator that is installed in the exhaust gas passage of the engine and has a dust collecting electrode that collects carbon particles in the exhaust gas, a fuel injection device that injects fuel into the electrostatic precipitator, and the injected fuel. 1. A carbon particle purification device for an engine, comprising: an ignition device for igniting carbon particles; and a purification means for burning and purifying carbon particles collected on a dust collecting electrode. (2) The purification means detects the amount of carbon particles collected based on the frequency of occurrence of spark discharge between the carbon particles collected on the dust collecting electrode and a discharge electrode provided in the electric precipitator. 2. The carbon particulate purifying device for an engine according to claim 1, wherein the carbon particulate purifying device for an engine is activated when the occurrence frequency of the carbon particles exceeds a predetermined value. (3) The purifying means is characterized in that the high voltage applied between the dust collecting electrode and the discharge electrode of the electrostatic precipitator is applied to the ignition device during operation to ignite the injected fuel. A carbon particulate purification device for carbon particles according to claim 1 or 2.