JPH077532Y2 - Exhaust gas purification device - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention is an exhaust gas in which, when a trap is clogged, particles trapped in the trap are sent to another trap for reburning. Purification device

(Prior Art) Currently used automobiles prevent harmful gases emitted from engines from being polluted by removing them with a catalyst device into the atmosphere. However, when such a catalyst device is used for a long time, there is a drawback that clogging occurs in the catalyst device and the efficiency of harmful gas removal is deteriorated.

(Problems to be Solved by the Invention) The present invention has been made in view of the above points, and when the trap is clogged, particles trapped in the trap are sent to another trap to be reburned. An object of the present invention is to provide an exhaust gas purification device configured to do so.

[Configuration of the Invention] (Means for Solving the Problems) A trap for removing harmful substances from exhaust gas discharged from an engine, a sensor for detecting clogging of the trap, and a particulate trapped in the trap When a trap with a regenerator that reburns the trap is detected by the sensor, high-pressure air is supplied to the trap to reverse the particulates from the trap to the trap with the regenerator to remove air. The exhaust gas purifying apparatus is provided with a control means for supplying and reburning.

(Function) A trap with a regenerator that reburns the particulates trapped in the trap that removes harmful substances from the exhaust gas discharged from the engine is installed in parallel, and if clogging is detected in the trap, High-pressure air is supplied to the trap so that the particulates flow backward from the trap to the trap with the regenerator, and air is supplied to reburn the trap.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 11 is a catalyst or trap, and 12 is a trap with a regenerator. Exhaust gas discharged from the engine (not shown) is sent to the catalyst 11, purified and discharged. A pipe 13 is provided between the intake side and the discharge side of the catalyst 11 to bypass the exhaust gas of the engine when the trap 12 is operated. A is a valve that closes when high-pressure air is made to flow backward from the discharge side of the trap 11, and B is the exhaust gas from the engine that is supplied to the pipe 13
The valve that is opened when the air is bypassed to C, the valve C that is opened when the particulates trapped in the trap 11 are reversed, and the valve D that is opened when air is sent to the trap 12 with the regenerator. It is a valve. 14
1 is a pressure sensor for detecting the pressure on the suction side of the trap 11, and 142 is a pressure sensor for detecting the pressure on the discharge side of the trap 11. These pressure sensors 141,142
The pressure detected at is input to the controller 14. Further, the opening / closing control of the valves A to D is also performed by the controller 14
Done by.

Next, the detailed configuration of the valves A to D will be described with reference to FIG. Each of these valves A to D is composed of a butterfly valve. In FIG. 2, reference numeral 21 is a disk-shaped valve body, which rotates about a shaft 22. The valve body 21 is rotated by an actuator 23 composed of an air cylinder or a hydraulic cylinder. When the valve body 21 is rotated to the broken line position, the valve is closed, and when it is rotated to the solid line position. The valve is open.

Next, the operation of the embodiment of the present invention configured as described above will be described. Exhaust gas discharged from the engine is sent to the catalyst 11, purified and discharged. If such a purification process is continued, clogging occurs in the catalyst 11. Therefore, a difference occurs between the pressure detected by the pressure sensor 141 and the pressure detected by the pressure sensor 142. this is,
This is because when the catalyst 11 is clogged, the exhaust gas sucked from the suction side of the catalyst 11 is accumulated and the pressure of the suction side of the catalyst 11 is increased. Here, ΔP = pressure on the suction side (pressure detected by the pressure sensor 141) −pressure on the discharge side (pressure detected by the pressure sensor 142), and this ΔP
When is greater than the set value N, it is determined that the catalyst 11 is clogged. In other words, the controller 14
The process of the flowchart shown in the figure is performed. First, “Δ
It is determined whether or not P> N ”(step S1). That is, it is determined whether or not the catalyst 11 is clogged. Here, if “NO”, that is, if it is determined that the clogging has not occurred, the valves A and B are opened and the valve C is opened.
The closed state of D and D is maintained (step S2). That is, the valves A to D are located at the positions shown by the solid line in FIG. Exhaust gas discharged from the engine is sent to the catalyst 11, purified and discharged. As such purification processing progresses, clogging occurs in the catalyst 11 and “ΔP>
When it becomes N, it is determined to be "YES" in step S1. Then, the valves A and B are closed at the positions indicated by the broken lines, the valves A, B and D are closed, and the valve C is opened. Then, the high-pressure air is backflowed from the discharge side of the catalyst 11 and the particulates in the catalyst 11 are moved to the trap 12 with the regenerator. Here, the exhaust gas discharged from the engine is directly opened to the atmosphere through the pipe 13. In this way, as the particulates in the catalyst 11 are sent to the trap 12 with the regenerator, the catalyst
11 clogging is getting less. The valve state in step S3 is continued as long as “ΔP> I” (where I is set to the value of ΔP in the state where no clogging occurs).

By the way, if “ΔP <I” is satisfied (“YE
S ”), valve C is closed (step S
Five). If the regeneration in the trap with regenerator 12 is not completed (NO in the determination in step S6), the valve D is opened and air is sent into the trap with regenerator 12 to cause the above-mentioned patty. The curate is burned (step S7). in this way,
Since air is supplied to the particulates to reburn them, the particulates can be efficiently burned. The valve D is open until the regeneration is completed, and when the regeneration is completed, it is determined that "YES" is determined in the above step S6 and the valve D is closed (step S8). After that, proceed to the above step S1 and "NO" in the above step S1.
Then, the valves A and B are opened, the valves A and B are opened, and the valves C and D are closed (step S2). In this way, the exhaust gas discharged from the engine is sent to the catalyst 11 again to be purified and discharged.

[Effects of the Invention] As described in detail above, according to the present invention, when a trap is clogged, high-pressure air is supplied to the trap and the particulates trapped in the trap are sent to another trap to supply the air. Since the fuel is supplied and reburned, when the trap is clogged, the clogging can be eliminated at any time to provide an exhaust gas purification device that can perform efficient purification.

[Brief description of drawings]

FIG. 1 is a diagram showing an exhaust gas purifying apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing the constitution of valves A to D, and FIG. 3 is a flow chart showing the operation of the same embodiment. 11 …… Trap, 12 …… Trap with regenerator, 14
...... Controller, A to D …… Valve.

Front page continued (72) Inventor Akio Ishida 4-21-1, Shimomaruko, Ota-ku, Tokyo Mitsubishi Motors Corporation Tokyo Motor Manufacturing Co., Ltd. Maruko factory (72) Inventor Yasuaki Kumagai 4-21, Shimomaruko, Ota-ku, Tokyo No. Mitsubishi Motors Co., Ltd. Tokyo Motor Manufacturing Co., Ltd. Maruko Factory (56) Bibliographic references Sho 5970017 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A trap for removing harmful substances from exhaust gas discharged from an engine, a sensor for detecting clogging of the trap, a trap with a regenerator for reburning particulates trapped in the trap, When the clogging of the trap is detected by the sensor, a control means for supplying high pressure air to the trap to reverse the particulates from the trap to the trap with the regenerator and supplying air to reburn is provided. An exhaust emission control device characterized by the above.