JPS6233937Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is attached to the exhaust pipe of the engine,
The present invention relates to a particulate filter regeneration device that removes particulate matter from exhaust gas.

Conventionally, engines have been equipped with particulate filters that purify the exhaust gas by removing particles such as soot and smoke from the exhaust gas. There is a drawback that unburnt soot and the like accumulates inside, causing clogging and rendering the filter unusable, and the particulate filter has to be replaced relatively early.

The present invention has been made to eliminate the drawbacks of the prior art described above, and its purpose is to supply fuel to some cylinders of an engine with multiple cylinders under light load of the engine. In a device that is designed to cut fuel during operation, when fuel is cut to some of the cylinders, only the high-temperature exhaust gas from the cylinders from which fuel is not cut is allowed to flow to the particulate filter. To prevent clogging in a particulate filter by incinerating unburned particles such as soot accumulated in the particulate filter, and to regenerate the particulate filter.

In short, the present invention is an engine having a plurality of cylinders, in which the supply of fuel to some cylinders is cut off when the engine is operated under a light load. exhaust pipe and a second pipe for the cylinder where the fuel cut is not performed.
a particulate filter is installed downstream of the confluence of the first exhaust pipe and the second exhaust pipe;
A bypass is provided that is connected in communication with the exhaust pipe of the particulate filter and the downstream side of the particulate filter, and the first exhaust pipe or the bypass is alternatively provided at a branch point between the bypass and the first exhaust pipe. A valve that opens and closes is provided, and if fuel is being cut to some of the cylinders, the bypass is opened to exhaust compressed air from the first exhaust pipe to the bypass, and the The present invention is characterized in that the high-temperature exhaust gas from the second exhaust pipe is made to flow through the particulate filter to regenerate the particulate filter.

The present invention will be explained below based on embodiments shown in the drawings. The engine 1 includes a plurality of cylinders 2, for example, first to sixth cylinders 2a, 2b, 2c, 2d, 2e.
and 2f, and some cylinders, for example, the first
~The supply of fuel to the third cylinders 2a, 2b, and 2c is cut off when the engine 1 is operating under a light load.

Cylinders 2a, 2b and 2c where fuel is cut
and a second exhaust pipe 3b for cylinders 2d, 2e, and 2f where fuel cut is not performed.
The exhaust pipe 3 is separated from the exhaust pipe 3, and arranged so as to join into one exhaust pipe 3. First exhaust pipe 3a
A particulate filter 5 is attached to the downstream side of the confluence point 4 between the first exhaust pipe 3a and the second exhaust pipe 3b, and is connected in communication with the first exhaust pipe 3a and the downstream side 6 of the particulate filter. A bypass 7 is provided. Further, at a branch point 8 between the bypass and the first exhaust pipe 3a, a valve 9 is provided to selectively open and close the first exhaust pipe 3a or the bypass 7.
is provided. The valve is centered around pin 10.
A crank 9a, which is rotatable within a range of 90 degrees and is fixed to the valve, is connected to a rod 13 of an actuator 12 via a link 11.

When fuel is being cut to some of the cylinders 2a, 2b, and 2c, the bypass 7 is opened to exhaust compressed air from the first exhaust pipe 3a to the bypass 7, and the compressed air is discharged from the second exhaust pipe. 3b is configured to flow through the particulate filter 5 to regenerate the particulate filter.

The present invention is constructed as described above, and its operation will be explained below. When the engine 1 is operating under a light load, the supply of fuel to the cylinders 2a, 2b, and 2c is cut off, and a larger amount of fuel than usual is supplied to the other cylinders 2d, 2e, and 2f.
On the other hand, the actuator 12 operates to retract the rod 13, which causes the link 11 to move towards the crank 9.
a in the direction of arrow A, the valve 9 closes the downstream side of the branch point 8 of the first exhaust pipe 3a, and conversely opens the bypass 7, as shown by the solid line.

As a result, only air is sucked into the cylinders 2a, 2b, and 2c and compressed, and the high-temperature air is passed from the first exhaust pipe 3a through the bypass 7 to the downstream side 6 of the confluence 4 of the exhaust pipe 3. flows to On the other hand, in the cylinders 2d, 2e, and 2f from which fuel is not cut, more fuel than usual is burned, so the exhaust gas becomes hotter and enters the particulate filter 5 from the second exhaust pipe 3b, and the particulate filter 5 enters the particulate filter 5 from the second exhaust pipe 3b. Since the unburned or half-burned particulate matter accumulated in the filter is incinerated and discharged to the exhaust pipe 3, the inside of the particulate matter filter 5 is restored to a clean state and can be reused.

Next, when the engine 1 shifts to high-load operation, the actuator 12 automatically operates and the rod 13
is pushed out, and the crank 9a is pushed out through the link 11.
rotates in the direction of arrow B, and the valve 9 closes the bypass 7 and opens the first exhaust pipe 3a, as shown in phantom lines. On the other hand, the cylinders 2a, 2b and 2c are also supplied with the normal amount of fuel, and the engine 1 now generates output from all six cylinders. And cylinders 2a, 2
The exhaust gases b and 2c flow from the first exhaust pipe 3a to the exhaust pipe 3, and further pass through the particulate filter 5.
The particulate matter in the exhaust gas is removed here. In addition, exhaust gas from cylinders 2d, 2e and 2f is also filtered through particulate filter 5.
The particulate matter is removed from the exhaust pipe 3 and exhausted to the outside through the exhaust pipe 3.

Since the present invention is constructed and operates as described above, the present invention is adapted to cut off the supply of fuel to some cylinders of an engine having multiple cylinders when the engine is operated under a light load. ,
When operating with fuel cut to some of the cylinders,
Since only the high-temperature exhaust gas from the cylinders from which fuel is not cut is allowed to flow through the particulate filter, unburned particles such as soot accumulated in the particulate filter are incinerated, preventing clogging in the particulate filter. It is possible to prevent this, and the effect that the particulate filter can be regenerated can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional schematic plan view showing an engine and a particulate filter regeneration device. 1 is the engine, 2 is the cylinder, 2a, 2b, 2c is the cylinder whose fuel supply is cut off, 2d, 2e, 2
f is a cylinder to which fuel supply is not cut off, 3 is an exhaust pipe, 3a is a first exhaust pipe, 3b is a second exhaust pipe,
4 is the confluence point of the first exhaust pipe and the second exhaust pipe, 5
6 is a particulate filter, 6 is a downstream side of the confluence, 7 is a bypass, 8 is a branch point between the bypass and the first exhaust pipe, and 9 is a valve.

Claims (1)

[Scope of utility model registration request] In an engine having a plurality of cylinders, the supply of fuel to some of the cylinders is cut off during light load operation of the engine, the first exhaust pipe for the cylinder to which the fuel cut is performed; A second exhaust pipe for a cylinder in which fuel is not cut is separated and merged with the second exhaust pipe, and a particulate filter is installed downstream of the junction of the first exhaust pipe and the second exhaust pipe. and a bypass connected to the first exhaust pipe and the downstream side of the particulate filter, and a bypass connected to the first exhaust pipe and the particulate filter at a branch point between the first exhaust pipe and the particulate filter. A valve is provided that selectively opens and closes the bypass, and when fuel is being cut to some of the cylinders, the bypass is opened and the compressed air from the first exhaust pipe is diverted to the bypass. A regeneration device for a particulate filter, characterized in that the particulate filter is regenerated by causing high-temperature exhaust gas from the second exhaust pipe to flow through the particulate filter.