JPS6346651Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device for re-burning particulate from a particulate filter provided in an exhaust pipe of an engine.

A particulate filter is installed in the engine exhaust pipe to remove particulate matter (particulate matter) contained in exhaust gas, and when a certain amount of particulate matter accumulates in this particulate filter, the accumulated particulate matter is re-burned. There is a device that regenerates a particulate filter by Conventionally, there are two ways to reburn particulate, one is to inject only fuel into the particulate filter, and the other is to inject fuel and air.The former method reduces the amount of oxygen during high-load operation with high exhaust temperature. Due to the lack of fuel, incomplete combustion occurs and the regeneration capacity of the filter is small, and the latter requires a separate drive for the air compression device, which has the disadvantage of increasing costs and reducing fuel efficiency.

The present invention was proposed in view of the above-mentioned problems.The exhaust gas flowing through the exhaust pipe is charged to a chamber to apply an exhaust brake to the vehicle, and the charged exhaust gas is used as air for re-combustion in the particulate. An object of the present invention is to provide a particulate reburning device for exhaust gas that can be used as an exhaust gas particulate reburning device.

Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 is a block diagram of a particulate reburning device according to an embodiment of the present invention. 1 is the engine body, 2 is the exhaust manifold, 3 is the exhaust pipe,
4 is a particulate filter provided in the middle of the exhaust pipe 3. 5 is exhaust manifold 2
This is an exhaust gas chamber pipe installed in the middle of the exhaust pipe 3 between the particulate filter 4 and the particulate filter 4. Reference numeral 6 designates an exhaust gas chamber for storing exhaust gas that has passed through the exhaust gas chamber pipe 5, and 7 designates a relief valve thereof. 8 closes the exhaust pipe 3 to send the exhaust gas to the exhaust gas chamber 6 and applies an exhaust brake, and closes the exhaust gas chamber pipe 5 to send the exhaust gas through the particulate filter 4 into the atmosphere. This is a discharge valve. Reference numeral 9 represents a control cylinder for operating the valve 8. 10 is an air tank, and 11 is a magnetic valve that controls the flow of air from the air tank 10 into the control cylinder 9. 12 is the exhaust brake operation switch mentioned above, and when turned on, magnetic valve 1 is activated.
Valve 1 opens and air in the air tank 10 flows into the control cylinder 9. Valve 8 closes the exhaust pipe 3 and exhaust gas flows into the exhaust gas chamber 6, applying an exhaust brake. Reference numeral 13 is a pilot lamp that lights up when the operating switch is turned on, and 14 is a power source for the magnetic valve 11 and the pilot lamp 13. 15 is an exhaust gas injection nozzle 1 which directs the exhaust gas in the exhaust gas chamber 6.
6, an exhaust gas injection pipe 1 injects into the exhaust pipe 3 in front of the particulate filter 4;
A magnetic valve 7 opens and closes the exhaust gas injection pipe 15. 18 is a fuel injection nozzle 19
a fuel injection pipe 2 for injecting fuel into the exhaust pipe 3 in front of the particulate filter 4;
0 is a magnetic valve that opens and closes the fuel injection pipe 18. 21 and 22 are a pressure sensor and a temperature sensor, respectively, which detect the pressure and temperature inside the exhaust pipe 3 in front of the particulate filter 4. 23 is a control circuit of this device, and a pressure sensor 21
The pressure and temperature signals in the exhaust pipe 3 in front of the particulate filter 4 detected by the temperature sensor 22 are input, and if the pressure is equal to or higher than a predetermined value, that is, the particulate filter 4 has a particulate filter of exhaust gas. When it is detected that a certain amount of deposit has been deposited, the magnetic valves 17 and 20
A “valve open” signal is sent to the exhaust pipe 3 in front of the particulate filter 4 for a predetermined period of time.
Fuel and exhaust gas in the exhaust gas chamber 6 are injected into the exhaust gas chamber 6 to re-burn the particulate matter in the particulate filter 4. If the temperature in front of the particulate filter 4 becomes abnormally high during this re-burning, the magnetite Immediately stop sending the "valve open" signal to the Tsuku valves 17 and 20,
Injection of fuel and exhaust gas is stopped to prevent damage to the particulate filter 4. 2
4 is a power supply for the control circuit 23;

Among the above, the temperature sensor 22 may be unnecessary depending on the actual temperature at the time of combustion of the particulate.

This invention provides an exhaust gas chamber to charge the exhaust gas in the middle of the exhaust pipe leading to the particulate filter, and uses the exhaust gas charged in this exhaust gas chamber as combustion air when reburning the particulate in the particulate filter. Since it can also be used as an exhaust brake device, it is possible to reburn the particulate filter reliably and regenerate the particulate filter at low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a particulate reburning device according to an embodiment of the present invention. 1... Engine body, 2... Exhaust manifold, 3... Exhaust pipe, 4... Particular filter, 5... Exhaust gas chamber pipe, 6...
...Exhaust gas chamber, 7...Relief valve, 8
...Valve, 9...Control cylinder, 10
...Air tank, 11,17,20...Magnetic valve, 12...Operation switch, 13...
Pilot lamp, 14, 24... Power supply, 15...
... Exhaust gas injection pipe, 16 ... Exhaust gas injection nozzle, 18 ... Fuel injection pipe, 19 ... Fuel injection nozzle, 21 ... Pressure sensor, 22 ... Temperature sensor, 23 ... Control circuit.

Claims (1)

[Claims for Utility Model Registration] A particulate filter that is installed in an exhaust pipe and removes particulate matter from exhaust gas, and a particulate filter that is provided between an exhaust manifold and the filter, and that is provided by branching off the exhaust pipe, and that includes a relief valve. an exhaust gas chamber provided with the exhaust gas chamber; a valve that selectively sends exhaust gas only to either the filter or the exhaust gas chamber; a drive device that drives the valve by operating a switch; an exhaust gas pipe that injects fuel with an injection nozzle in front of the filter, an exhaust gas injection valve that opens and closes this exhaust gas pipe, a fuel injection pipe that injects fuel with an injection nozzle in front of the filter, and a fuel injection that opens and closes this fuel injection pipe. a pressure sensor that detects the pressure in the exhaust pipe in front of the particulate filter; a pressure signal detected by the pressure sensor is input, and when the pressure is equal to or higher than a predetermined value, the exhaust gas injection valve is activated. A particulate reburning device for exhaust gas, comprising: a control circuit that outputs a signal for opening the fuel injection valve for a predetermined period of time to the exhaust gas injection valve and the fuel injection valve.