JP2019124179A - Internal combustion engine and control method for the same - Google Patents

Abstract

To provide an internal combustion engine which can reduce a pressure loss caused by an air filter and extend lives of filters, such as the air filter, an oil filter, and an exhaust filter, which might be clogged by foreign objects.SOLUTION: An intake line 3 is provided with: an intake dust sensor 32; a cyclone filter 33; an air filter 31; and a first filter bypass line 34. An oil filter 21 is provided within an engine body 2. An exhaust filter 41 is provided at an exhaust line 4. An internal combustion engine 1 is provided with a control part 5 which switches use of the first filter bypass line 34 based on output of the intake dust sensor 32.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an internal combustion engine and a control method of the internal combustion engine.

  2. Description of the Related Art Conventionally, an internal combustion engine is provided with an air filter (intake air filter) in order to filter and remove foreign matter from the air taken into the internal combustion engine. The air filter becomes clogged with time, and this clog causes a pressure loss, so periodic replacement, cleaning, etc. are required. In particular, if the air filter is too fine, even if it is a new one (even if there is no clogging), the pressure drop resistance of the intake air will be resisted. It is provided. Thus, it is considered that the decrease in intake efficiency due to the pressure loss is unavoidable.

  Also, in recent years, as a technique for suppressing such clogging of the air filter, there has been reported a technique for arranging a precleaner having an air turning means and a switching means on the suction side of the air cleaner as disclosed in Patent Document 1. .

Unexamined-Japanese-Patent No. 2006-37947

  When the air taken into the internal combustion engine contains foreign matter, it is not only the air filter that is affected. Here, the influence when foreign matter is contained in the air taken into the internal combustion engine will be described in more detail with reference to FIG.

  FIG. 2 is a simplified configuration diagram showing an example of the configuration of a conventional internal combustion engine. As shown in FIG. 2, the conventional internal combustion engine 101 is generated from an engine body 102 that burns air and fuel to generate power, an intake line 103 for supplying air to the engine body 102, and the engine body 102. And an exhaust line 104 for discharging the exhaust gas to the outside.

  The air intake line 103 is provided with an air filter 131 for removing foreign matter contained in the air drawn into the air intake line 103. Inside the engine body 102, an oil filter 121 for removing foreign matter contained in the lubricating oil circulating inside the engine body 102 is provided. The exhaust line 104 is provided with an exhaust filter 141 for removing particulate matter in exhaust gas.

  Foreign matter mixed in from the intake line 103 is not limited to the air flow system (supercharger, intake manifold, combustion chamber, exhaust manifold, exhaust pipe, chimney, silencer / muffler, etc.), and the gap between the liner and the piston ring and the piston It mixes in the crankcase from the combustion chamber of the engine main body 102 through the “junction (gap)” of the ring. Foreign matters mixed in the crankcase mix in lubricating oil (also called engine oil or Lubricant Oil (LO)) accumulated in an oil pan or the like. The lubricating oil mixed with foreign matter circulates in the engine body 102 according to the oil circuit in the engine body 102. The oil filter 121 is included in the circulation process, and is configured to remove foreign matter in the lubricating oil. The oil filter 121 is also clogged with the passage of time, so it needs to be replaced regularly. However, the design specifications of the oil filter 121 are not linked to the degree of contamination of foreign matter from the air into the lubricating oil. Therefore, when many foreign substances derived from air adhere to the oil filter 121, it is conceivable that the clogging of the oil filter 121 is quickened (the life is shortened).

  In addition, an amount of a certain percentage of the foreign matter that has passed through the air filter 131 is discharged to the exhaust line 104 through the combustion chamber of the engine body 102. For example, in a diesel engine, an exhaust filter (Diesel Particulate Filter: DPF) 141 or the like is provided in an exhaust line 104, and particles are also collected by this filter. However, the main purpose of the exhaust filter 141 is the collection of soot components generated by combustion. If the amount of foreign matter mixed in from the intake line 103 is excessive, it is conceivable that clogging of the exhaust filter 141 becomes fast (the life becomes short).

  The above-mentioned patent document 1 extends the life of the air cleaner by disposing a precleaner having an air turning means and a switching means on the suction side of the air cleaner. However, this patent document 1 does not consider the extension of the life of the oil filter and the exhaust filter further downstream.

  The present invention has been made in view of such circumstances, and reduces the pressure loss due to the air filter and has long life span of filters such as air filter, oil filter, exhaust filter, etc. which may be clogged with foreign matter It is an object of the present invention to provide an internal combustion engine and an internal combustion engine control method that can be

In order to solve the above-mentioned subject, an internal combustion engine of the present invention adopts the following means.
According to the present invention, an engine body that generates power by burning air and fuel, an intake line for supplying air to the engine body, and an exhaust line for discharging exhaust gas generated from the engine body to the outside An intake dust sensor for detecting foreign matter contained in the air taken into the intake line, and a cyclone filter connected to the downstream side of the intake dust sensor for removing the foreign matter. An air filter connected to the downstream side of the cyclone filter for removing foreign matter that has passed through the cyclone filter; a branch from between the intake dust sensor and the cyclone filter; and the air filter and the engine body A first filter bypass line connected between the internal combustion engine and the engine body; An oil filter is provided for removing foreign substances contained in the lubricating oil circulating inside the engine body, and an exhaust filter for removing particulate matter in the exhaust gas is provided on the exhaust line, and the intake dust sensor The internal combustion engine is provided with a control unit that switches the use of the first filter bypass line based on the output of the control unit.

  In the internal combustion engine of the present invention, since the first filter bypass line is provided in the intake line, the cyclone filter and the air filter are bypassed by sending the air taken into the intake line to the first filter bypass line. can do. Further, since the intake dust sensor is provided in the intake line, it is possible to detect foreign matter contained in the air taken into the intake line. In addition, since the control unit that switches the use of the first filter bypass line is provided based on the output of the intake dust sensor, the first filter is controlled by the control unit based on the detection result of the foreign matter by the intake dust sensor. The use of the bypass line can be switched. Specifically, when the air drawn into the intake line is a clean air of a level that can be determined to have no influence on engine operation, it is not necessary to pass through a cyclone filter or an air filter of the intake line. Therefore, by sending such clean air to the bypass line (that is, using the bypass line), it is possible to quickly send the sucked air to the engine body and reduce the pressure loss due to the air filter. . Further, in the internal combustion engine of the present invention, since the foreign matter contained in the air taken into the intake line is first removed by the cyclone filter, the cyclone filter does not have to be clogged by the foreign matter. Removal of foreign material can be done first. Therefore, it is possible to extend the life of the air filter, the oil filter, the exhaust filter, and the like, which are present on the downstream side of the cyclone filter and may be clogged with foreign matter (change frequency of replacement can be reduced).

  The internal combustion engine includes an air filter differential pressure sensor that detects a pressure difference between an inlet pressure and an outlet pressure of the air filter, and the control unit controls the air filter based on an output of the air filter differential pressure sensor. It is preferable to notify the exchange.

  If an air filter differential pressure sensor is provided, the condition of the air filter clogging can be monitored. In addition, if the control unit is configured to notify replacement of the air filter based on the output of the air filter differential pressure sensor, it is possible to notify the operator of replacement of the air filter quickly. This makes it possible to detect clogging of the air filter early.

  The internal combustion engine includes an oil filter differential pressure sensor that detects a pressure difference between an inlet pressure and an outlet pressure of the oil filter, and the control unit is configured to control the pressure of the oil filter based on an output of the oil filter differential pressure sensor. It is preferable to notify the exchange.

  If an oil filter differential pressure sensor is provided, the condition of clogging of the oil filter can be monitored. In addition, if the control unit is configured to notify the replacement of the oil filter based on the output of the oil filter differential pressure sensor, it is possible to notify the operator of the replacement of the oil filter quickly. This makes it possible to detect clogging of the oil filter early.

  In the internal combustion engine, the intake line further includes a second filter bypass line branched from between the cyclone filter and the air filter and connected between the air filter and the engine body. Preferably, the control unit switches the use of the second filter bypass line based on an output of the intake dust sensor and an output of the air filter differential pressure sensor.

  If the second filter bypass line is provided, the air filter can be bypassed by sending the air from which foreign matter has been removed by the cyclone filter to the second filter bypass line. Therefore, if the second filter bypass line is used, foreign substances in the air can be removed by the cyclone filter, so that adverse effects on the downstream oil filter and exhaust filter can be suppressed. Further, if the control unit is configured to switch the use of the second filter bypass line based on the output of the intake dust sensor, the first filter bypass is selected according to the degree of cleanliness of the air drawn into the intake line. A three-stage operation is possible such as using a line, using a second filter bypass line, or not using any bypass line. In addition, if the control unit is configured to switch the use of the second filter bypass line based on the output of the air filter differential pressure sensor, the second filter bypass is detected when an abnormality of the air filter is detected. The line can be used to bypass the air filter. For example, when clogging of the air filter is confirmed, the air filter can be replaced while bypassing the air filter using the second filter bypass line.

  According to the present invention, an engine body that generates power by burning air and fuel, an intake line for supplying air to the engine body, and an exhaust line for discharging exhaust gas generated from the engine body to the outside An intake dust sensor for detecting foreign matter contained in the air taken into the intake line, and a cyclone filter connected to the downstream side of the intake dust sensor for removing the foreign matter. An air filter connected to the downstream side of the cyclone filter for removing foreign matter that has passed through the cyclone filter; a branch from between the intake dust sensor and the cyclone filter; and the air filter and the engine body A first filter bypass line connected between the internal combustion engine and the engine body; Control of an internal combustion engine provided with an oil filter for removing foreign matter contained in lubricating oil circulating inside the engine body, and the exhaust line provided with an exhaust filter for removing particulate matter in the exhaust gas In the method, a foreign matter detecting step of detecting foreign matter contained in air taken into the intake line by the intake dust sensor, a first foreign matter removing step of removing the foreign matter by the cyclone filter, and the air filter A second foreign matter removing step of removing foreign matter having passed through the cyclone filter; and a particulate matter removing step of removing particulate matter in the exhaust gas by the exhaust filter, the intake dust sensor Using the first filter bypass line based on the output of the first foreign matter removal process and the second foreign matter removal process To provide a control method for an internal combustion engine for controlling to skip the extent.

  In the control method of the internal combustion engine according to the present invention, in order to use the internal combustion engine provided with the first filter bypass line in the intake line, the air taken into the intake line is sent to the first filter bypass line, Cyclone filters and air filters can be bypassed. In addition, since an internal combustion engine provided with an intake dust sensor in the intake line is used, foreign substances contained in the air taken into the intake line can be detected. Therefore, it can be determined whether to use the first filter bypass line based on the detection result of the foreign matter by the intake dust sensor. Specifically, when the air drawn into the intake line is a clean air of a level that can be determined to have no influence on engine operation, it is not necessary to pass through a cyclone filter or an air filter of the intake line. Therefore, by sending such clean air to the bypass line, it is possible to skip the first foreign matter removing step and the second foreign matter removing step, so it is possible to quickly send the sucked air to the engine body, The pressure loss due to the air filter can be reduced. Further, in the control method of the internal combustion engine according to the present invention, since the foreign matter contained in the air taken into the intake line is first removed by the cyclone filter, the cyclone having no fear of clogging due to the foreign matter The filter allows for the removal of foreign objects first. Therefore, it is possible to extend the life of the air filter, the oil filter, the exhaust filter, and the like, which are present on the downstream side of the cyclone filter and may be clogged with foreign matter (change frequency of replacement can be reduced).

  According to the internal combustion engine and the control method of the internal combustion engine of the present invention, it is possible to reduce the pressure loss due to the air filter and extend the life of the air filter, the oil filter, the exhaust filter, etc. Can.

BRIEF DESCRIPTION OF THE DRAWINGS It is a simplified block diagram which shows the structure of the internal combustion engine which concerns on one Embodiment of this invention. It is a simplified block diagram which shows an example of a structure of the conventional internal combustion engine.

  Hereinafter, an embodiment of an internal combustion engine according to the present invention will be described with reference to the drawings.

[Internal combustion engine]
Hereinafter, an internal combustion engine according to an embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a simplified block diagram showing the configuration of an internal combustion engine according to an embodiment of the present invention.
The internal combustion engine 1 of the present embodiment includes an engine body 2 that burns air and fuel to generate power, an intake line 3 for supplying air to the engine body 2, and exhaust gas generated from the engine body 2. And an exhaust line 4 for exhausting the gas.

  An intake dust sensor 32, a cyclone filter 33, an air filter 31, and a first filter bypass line 34 are provided in the intake line 3. The intake dust sensor 32 detects foreign matter contained in the air drawn into the intake line 3. The cyclone filter 33 is connected to the downstream side of the intake dust sensor 32 to remove foreign matter. The air filter 31 is connected to the downstream side of the cyclone filter 33 and removes foreign matter that has passed through the cyclone filter 33. The first filter bypass line 34 branches from between the intake dust sensor 32 and the cyclone filter 33 and is connected between the air filter 31 and the engine body 2.

  The intake dust sensor 32 is not particularly limited as long as foreign matter contained in the air can be detected. Specifically, a general-purpose optical sensor for detecting the presence or absence of foreign matter by applying an optical signal to air flowing through the intake line 3 can be mentioned.

  An openable / closable valve 35 is provided downstream of the intake dust sensor 32 (between the intake dust sensor 32 and the cyclone filter 33, downstream of the branch point to the first filter bypass line 34). Further, an openable / closable valve 36 is provided in the middle of the first filter bypass line 34. If the first filter bypass line 34 is used, the valve 35 is closed and the valve 36 is opened. On the other hand, when the first filter bypass line 34 is not used, the valve 35 is opened and the valve 36 is closed.

  Here, the internal combustion engine 1 is provided with a control unit 5 that switches the use of the first filter bypass line 34 based on the output of the intake dust sensor 32. Specifically, when using the first filter bypass line 34, the control unit 5 performs control to close the valve 35 and open the valve 36. On the other hand, when the first filter bypass line 34 is not used, the valve 35 is opened and the valve 36 is closed.

  The control unit 5 includes, for example, a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), a computer readable storage medium, and the like. Then, a series of processes for realizing various functions are stored in the form of a program, for example, in a storage medium or the like in the form of a program, and the CPU reads this program into a RAM etc. Thus, various functions are realized. The program may be installed in advance in a ROM or other storage medium, may be provided as stored in a computer-readable storage medium, or may be distributed via a wired or wireless communication means. Etc. may be applied. The computer readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory or the like.

  The air filter 31 is provided with an air filter differential pressure sensor 37 that detects a pressure difference between the inlet pressure and the outlet pressure of the air filter 31. The air filter differential pressure sensor 37 detects a pressure difference between the inlet pressure and the outlet pressure of the air filter 31. The output of the air filter differential pressure sensor 37 is sent to the control unit 5. When the differential pressure exceeds a predetermined value, the control unit 5 determines clogging of the air filter 31. Instead of the differential pressure sensor, an upstream pressure sensor that measures the pressure on the upstream side of the air filter 31 and a downstream pressure sensor that measures the pressure on the downstream side of the air filter 31 may be provided.

  The control unit 5 is configured to notify replacement of the air filter 31 based on the output of the air filter differential pressure sensor 37. Although it does not specifically limit about the notification method, For example, the method of notifying by an alarm is mentioned.

  A second filter bypass line 38 branched from between the cyclone filter 33 and the air filter 31 and connected between the air filter 31 and the engine body 2 is further provided in the intake line 3. An openable / closable valve 39 is provided in the middle of the second filter bypass line 38. An openable / closable valve 40 is provided downstream of the cyclone filter 33 (between the cyclone filter 33 and the air filter 31 and downstream of a branch point to the second filter bypass line 38). If a second filter bypass line 38 is used, the valve 40 is closed and the valve 39 is opened. On the other hand, when the second filter bypass line 38 is not used, the valve 40 is opened and the valve 39 is closed.

  The control unit 5 is configured to switch the use of the second filter bypass line 38 based on the output of the intake dust sensor 32 and the output of the air filter differential pressure sensor 37. Specifically, when using the second filter bypass line 38, the control unit 5 performs control to close the valve 40 and open the valve 39. On the other hand, when the second filter bypass line 38 is not used, the valve 40 is opened and the valve 39 is closed.

  An oil filter 21 is provided in the engine body 2 for removing foreign matter contained in the lubricating oil circulating in the engine body 2. The oil filter 21 is provided with an oil filter differential pressure sensor 22 that detects a pressure difference between the inlet pressure and the outlet pressure of the oil filter 21. The oil filter differential pressure sensor 22 detects a pressure difference between the inlet pressure and the outlet pressure of the oil filter 21. The output of the oil filter differential pressure sensor 22 is sent to the control unit 5. The control unit 5 determines clogging of the oil filter 21 when the differential pressure exceeds a predetermined value. Instead of the differential pressure sensor, an upstream pressure sensor that measures the pressure on the upstream side of the oil filter 21 and a downstream pressure sensor that measures the pressure on the downstream side of the oil filter 21 may be provided.

  The control unit 5 is configured to notify the replacement of the oil filter 21 based on the output of the oil filter differential pressure sensor 22. Although it does not specifically limit about the notification method, For example, the method of notifying by an alarm is mentioned.

  The exhaust line 4 is provided with an exhaust filter 41 for removing particulate matter in the exhaust gas. As the exhaust filter 41, for example, one having a differential pressure sensor originally provided is used.

According to the configuration described above, according to the present embodiment, the following effects can be obtained.
As described above, in the internal combustion engine 1 of the present embodiment, the first filter bypass line 34 is provided in the intake line 3. The cyclone filter 33 and the air filter 31 can be bypassed by sending the air drawn into the intake line 3 to the first filter bypass line 34. Further, since the intake dust sensor 32 is provided in the intake line 3, foreign matter contained in the air drawn into the intake line 3 can be detected. In addition, the internal combustion engine 1 is provided with a control unit 5 that switches the use of the first filter bypass line 34 based on the output of the intake dust sensor 32. As a result, the control unit 5 can switch the use of the first filter bypass line 34 based on the detection result of the foreign matter by the intake dust sensor 32.

  Specifically, when the air drawn into the intake line 3 is clean air of a level that can be determined not to affect the engine operation, it is not necessary to pass the cyclone filter 33 and the air filter 31 of the intake line 3. Therefore, by sending such clean air to the bypass line (ie, using the bypass line), it is possible to send the sucked air to the engine body 2 quickly and to reduce the pressure loss by the air filter 31. Can.

  In the internal combustion engine 1 of the present embodiment, foreign substances contained in the air taken into the intake line 3 are first removed by the cyclone filter 33. Therefore, the foreign matter can be removed first by the cyclone filter 33 which does not have to be clogged with the foreign matter. Thus, the filters such as the air filter 31, the oil filter 21, the exhaust filter 41 and the like which are present on the downstream side of the cyclone filter 33 and may be clogged with foreign matter can be extended in life (reduction of replacement frequency).

  If the air filter differential pressure sensor 37 is provided, the clogging condition of the air filter 31 can be monitored. In addition, if the control unit 5 is configured to notify the replacement of the air filter 31 based on the output of the air filter differential pressure sensor 37, it is possible to notify the operator of the replacement of the air filter 31 quickly. Thus, clogging of the air filter 31 can be detected early.

  If the oil filter differential pressure sensor 22 is provided, the clogging condition of the oil filter 21 can be monitored. Further, if the control unit 5 is configured to notify the replacement of the oil filter 21 based on the output of the oil filter differential pressure sensor 22, it is possible to notify the operator of the replacement of the oil filter 21 quickly. Thus, clogging of the oil filter 21 can be detected early.

  If the second filter bypass line 38 is provided, the air filter 31 can be bypassed by sending the air from which foreign matter has been removed by the cyclone filter 33 to the second filter bypass line 38. Therefore, if the second filter bypass line 38 is used, foreign matter in the air can be removed by the cyclone filter 33, so that the adverse effect on the downstream oil filter 21 and the exhaust filter 41 can be suppressed.

  Also, if the control unit 5 is configured to switch the use of the second filter bypass line 38 based on the output of the intake dust sensor 32, operation is performed according to the degree of cleanliness of the air drawn into the intake line 3. It is possible to change. Specifically, three-stage operation can be performed such as using the first filter bypass line 34, using the second filter bypass line 38, or not using any bypass line. In addition, if the control unit 5 is configured to switch the use of the second filter bypass line 38 based on the output of the air filter differential pressure sensor 37, air is detected when an abnormality of the air filter 31 is detected. The filter 31 can be bypassed. For example, when clogging of the air filter 31 is confirmed, the air filter 31 can be replaced while bypassing the air filter 31 using the second filter bypass line 38.

[Control method of internal combustion engine]
Next, an example of the control method of the internal combustion engine of the present invention will be described.
The control method of an internal combustion engine according to the present invention includes a foreign matter detecting step, a first foreign matter removing step, a second foreign matter removing step, and a particulate matter removing step. In the foreign matter detection step, foreign matter contained in the air taken into the intake line is detected by the intake dust sensor. In the first foreign matter removing step, foreign matter is removed by a cyclone filter. In the second foreign matter removing step, the air filter removes foreign matter that has passed through the cyclone filter. In the particulate matter removing step, the particulate matter in the exhaust gas is removed by the exhaust filter. Then, based on the output of the intake dust sensor, the first filter bypass line is used to perform control so as to skip the first foreign matter removing step and the second foreign matter removing step.

  In addition, although the case where the control method of the internal combustion engine of this invention is applied to the internal combustion engine 1 shown in FIG. 1 below is demonstrated as an example, it is not limited to this.

(Foreign substance detection process)
In the foreign matter detection step, foreign matter contained in the air drawn into the intake line 3 is detected by the intake dust sensor 32. The specific detection method is as described above.

(First foreign substance removal process)
In the first foreign matter removing step, the cyclone filter 33 removes foreign matter.

(Second foreign substance removal process)
In the second foreign matter removing step, the air filter 31 removes foreign matter that has passed through the cyclone filter 33.

(Particulate matter removal process)
In the particulate matter removing step, the particulate matter in the exhaust gas generated from the engine body 2 and flowing into the exhaust line 4 is removed by the exhaust filter 41.

  Here, in the present embodiment, the first filter bypass line 34 is used based on the output of the intake dust sensor 32, and control is performed so as to skip the first foreign matter removing step and the second foreign matter removing step. . Specifically, when the intake dust sensor 32 determines that the air drawn into the intake line 3 is a clean air at a level that does not affect the engine operation, the valve 35 is closed and the valve 36 is opened to perform the first filter. The bypass line 34 is used. Thereby, by bypassing the cyclone filter 33 and the air filter 31, the first foreign matter removing step and the second foreign matter removing step are skipped.

  Further, in the present embodiment, the second filter bypass line 38 is used based on the output of the intake dust sensor 32, and control to skip only the second foreign matter removing step is also performed. Specifically, when it is determined by the intake dust sensor 32 that the air drawn into the intake line 3 contains a small amount of foreign matter, the valve 40 is closed and the valve 39 is opened to perform the second filter bypass line. Use 38. Thus, after the foreign matter is removed by the cyclone filter 33 (first foreign matter removing step), the air filter 31 is bypassed to skip only the second foreign matter removing step.

According to the configuration described above, according to the present embodiment, the following effects can be obtained.
As described above, in the control method of the internal combustion engine of the present embodiment, the internal combustion engine 1 in which the first filter bypass line 34 is provided in the intake line 3 is used. The cyclone filter 33 and the air filter 31 can be bypassed by sending the air drawn into the intake line 3 to the first filter bypass line 34. Further, since the internal combustion engine 1 in which the intake dust sensor 32 is provided in the intake line 3 is used, foreign substances contained in the air taken into the intake line 3 can be detected. Therefore, based on the detection result of the foreign matter by the intake dust sensor 32, it can be determined whether or not the first filter bypass line 34 is used.

  Specifically, when the air drawn into the intake line 3 is clean air of a level that can be determined not to affect the engine operation, it is not necessary to pass the cyclone filter 33 and the air filter 31 of the intake line 3. Therefore, the first foreign matter removing step and the second foreign matter removing step can be skipped by sending such clean air to the bypass line. Thus, the intake air can be quickly sent to the engine body 2 and the pressure loss due to the air filter 31 can be reduced.

  Further, in the control method of the internal combustion engine of the present embodiment, the foreign matter contained in the air drawn into the intake line 3 is first removed by the cyclone filter 33. Therefore, the foreign matter can be removed first by the cyclone filter 33 which does not have to be clogged with the foreign matter. Thus, the filters such as the air filter 31, the oil filter 21, the exhaust filter 41 and the like which are present on the downstream side of the cyclone filter 33 and may be clogged with foreign matter can be extended in life (reduction of replacement frequency).

  If the second filter bypass line 38 is used based on the output of the intake dust sensor 32 and only the second foreign matter removing step is skipped, the degree of cleanliness of the air taken into the intake line 3 is determined. It is possible to change the operation accordingly. Specifically, it is possible to operate in three stages, such as skipping the first foreign matter removing step and the second foreign matter removing step, skipping only the second foreign matter removing step, or not skipping any foreign matter removing step Become. In addition, if the second filter bypass line 38 is used based on the output of the air filter differential pressure sensor 37 and only the second foreign matter removing step is skipped, an abnormality in the air filter 31 is detected. When done, the air filter 31 can be bypassed. For example, when clogging of the air filter 31 is confirmed, the air filter 31 can be replaced while bypassing the air filter 31 by skipping only the second foreign matter removing step.

  In the above embodiment, although the case where the internal combustion engine 1 is provided with four valves 35, 36, 39 and 40 has been described as an example, the present invention is not limited to this. That is, it is good also as an aspect which provided five or more numbers of valves. Also, a three-way valve may be used.

DESCRIPTION OF SYMBOLS 1 internal combustion engine 2 engine body 3 intake line 4 exhaust line 5 control part 21 oil filter 22 oil filter differential pressure sensor 31 air filter 32 intake dust sensor 33 cyclone filter 34 first filter bypass line 35, 36, 39, 40 valve 37 Air filter differential pressure sensor 38 second filter bypass line 41 exhaust filter

Claims (5)

An engine body that burns air and fuel to generate power,
An intake line for supplying air to the engine body;
An exhaust line for discharging the exhaust gas generated from the engine body to the outside;
Equipped with
In the intake line, an intake dust sensor for detecting foreign matter contained in air taken into the intake line; a cyclone filter connected to the downstream side of the intake dust sensor for removing the foreign matter; An air filter connected to the downstream side for removing foreign matter that has passed through the cyclone filter, branched from between the intake dust sensor and the cyclone filter, and connected between the air filter and the engine body A first filter bypass line is provided,
An oil filter is provided inside the engine body to remove foreign matter contained in the lubricating oil circulating inside the engine body,
The exhaust line is provided with an exhaust filter for removing particulate matter in the exhaust gas,
A control unit is provided to switch use of the first filter bypass line based on an output of the intake dust sensor. It has an air filter differential pressure sensor that detects a pressure difference between the inlet pressure and the outlet pressure of the air filter,
The internal combustion engine according to claim 1, wherein the control unit notifies replacement of the air filter based on an output of the air filter differential pressure sensor. It has an oil filter differential pressure sensor that detects the pressure difference between the inlet pressure and the outlet pressure of the oil filter,
The internal combustion engine according to claim 1 or 2, wherein the control unit notifies replacement of the oil filter based on an output of the oil filter differential pressure sensor. The intake line further includes a second filter bypass line branched from between the cyclone filter and the air filter and connected between the air filter and the engine body.
3. The internal combustion engine according to claim 2, wherein the control unit switches the use of the second filter bypass line based on an output of the intake dust sensor and an output of the air filter differential pressure sensor. It has an engine body that burns air and fuel to generate power, an intake line for supplying air to the engine body, and an exhaust line for discharging the exhaust gas generated from the engine body to the outside. An intake dust sensor for detecting foreign matter contained in the air taken into the intake line; a cyclone filter connected to the downstream side of the intake dust sensor for removing the foreign matter; and the cyclone filter An air filter for removing foreign matter that has passed through the cyclone filter and a branch from between the intake dust sensor and the cyclone filter and connected between the air filter and the engine body. A first filter bypass line, and inside the engine body, the engine In the control method of an internal combustion engine, an oil filter is provided for removing foreign substances contained in lubricating oil circulating in the interior of the engine, and the exhaust line is provided with an exhaust filter for removing particulate matter in the exhaust gas ,
A foreign matter detection step of detecting foreign matter contained in air taken into the intake line by the intake dust sensor;
A first foreign matter removing step of removing the foreign matter by the cyclone filter;
A second foreign matter removing step of removing foreign matter having passed through the cyclone filter by the air filter;
A particulate matter removing step of removing particulate matter in the exhaust gas by the exhaust filter;
Have
An internal combustion engine that is controlled based on the output of the intake dust sensor to skip the first foreign matter removing step and the second foreign matter removing step using the first filter bypass line. Control method.

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