JP6957366B2 - Internal combustion engine and internal combustion engine control method - Google Patents

Description

The present invention relates to an internal combustion engine and a method for controlling an internal combustion engine.

Conventionally, an air filter (intake filter) is provided in an internal combustion engine in order to filter and remove foreign substances in the air sucked into the internal combustion engine. The air filter becomes clogged with the passage of time, and this clogging causes pressure loss. Therefore, it is necessary to replace or clean the air filter regularly. In particular, if the mesh of the air filter is too fine, even if it is new (even if it is not clogged), it will become a pressure loss resistance of the intake air. It is provided. In this way, it is considered that the decrease in intake efficiency due to pressure loss is unavoidable.

Further, in recent years, as a technique for suppressing such clogging of an air filter, a technique for arranging a pre-cleaner having an air swirling means and a switching means on the suction side of the air cleaner as in Patent Document 1 has been reported. ..

Japanese Unexamined Patent Publication No. 2006-37947

If the air taken into the internal combustion engine contains foreign matter, it is not only the air filter that is affected. Here, the effect of foreign matter contained in the air sucked 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 main body 102 that burns air and fuel to generate power, an intake line 103 for supplying air to the engine main body 102, and an engine main body 102. It is provided with an exhaust line 104 for discharging the exhaust gas to the outside.

The intake line 103 is provided with an air filter 131 that removes foreign matter contained in the air sucked into the intake line 103. Inside the engine body 102, an oil filter 121 is provided to remove foreign substances contained in the lubricating oil circulating inside the engine body 102. The exhaust line 104 is provided with an exhaust filter 141 for removing particulate matter in the 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.), but also the gap between the liner and piston ring and the piston. It is mixed into the crank case from the combustion chamber of the engine body 102 through the "joint (gap)" of the ring. Foreign matter mixed in the crankcase is mixed in the lubricating oil (also referred to as engine oil or Lubricant Oil (LO)) accumulated in the 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. There is an oil filter 121 in the circulation process, and it is configured to remove foreign substances in the lubricating oil. The oil filter 121 also becomes clogged with the passage of time, and therefore needs to be replaced regularly. However, the design specifications of the oil filter 121 are not linked to the degree of foreign matter mixed in the lubricating oil from the air. Therefore, when a large amount of air-derived foreign matter adheres to the oil filter 121, it is conceivable that the oil filter 121 is clogged faster (the life is shortened).

Further, 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 the exhaust line 104, and particles are also collected by this filter. However, the main purpose of the exhaust filter 141 is to collect soot components generated by combustion. If the amount of foreign matter mixed in from the intake line 103 is excessive, it is conceivable that the exhaust filter 141 is clogged faster (the life is shortened).

In Patent Document 1 described above, the life of the air cleaner is extended by arranging a pre-cleaner having an air swirling 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 has a long life of filters such as an air filter, an oil filter, and an exhaust filter, which reduce the pressure loss due to the air filter and may cause clogging due to foreign matter. It is an object of the present invention to provide an internal combustion engine and a control method for the internal combustion engine.

In order to solve the above problems, the internal combustion engine of the present invention employs the following means.
In the present invention, an engine body for generating 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. The intake line includes an intake dust sensor that detects foreign matter contained in the air sucked into the intake line, and a cyclone filter that is connected to the downstream side of the intake dust sensor and removes the foreign matter. An air filter that is connected to the downstream side of the cyclone filter and removes foreign matter that has passed through the cyclone filter, and a branch from between the intake dust sensor and the cyclone filter, the air filter and the engine body. A first filter bypass line connected between them is provided, and an oil filter for removing foreign matter contained in the lubricating oil circulating inside the engine body is provided inside the engine body. The exhaust line is provided with an exhaust filter for removing particulate matter in the exhaust gas, and an internal combustion engine provided with a control unit for switching the use of the first filter bypass line based on the output of the intake dust sensor. I will provide a.

In the internal combustion engine of the present invention, since the intake line is provided with the first filter bypass line, the air sucked into the intake line is sent to the first filter bypass line to bypass the cyclone filter and the air filter. 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 sucked into the intake line. In addition, since a control unit for switching the use of the first filter bypass line is provided based on the output of the intake dust sensor, the control unit performs the first filter based on the detection result of foreign matter by the intake dust sensor. You can switch the use of the bypass line. Specifically, when the air sucked into the intake line is clean air at a level that can be judged not to affect the engine operation, it is not necessary to pass the cyclone filter or the air filter of the intake line. Therefore, by sending such clean air to the bypass line (that is, using the bypass line), the sucked air can be quickly sent to the engine body and the pressure loss due to the air filter can be reduced. .. Further, in the internal combustion engine of the present invention, foreign matter contained in the air sucked into the intake line is first removed by the cyclone filter, so that the cyclone filter does not cause clogging due to the foreign matter. Foreign matter can be removed first. Therefore, the life of filters such as air filters, oil filters, and exhaust filters, which are located on the downstream side of the cyclone filter and may be clogged by foreign matter, can be extended (replacement frequency can be reduced).

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

If the air filter differential pressure sensor is provided, it is possible to monitor the state of clogging of the air filter. Further, if the control unit is configured to notify the replacement of the air filter based on the output of the differential pressure sensor of the air filter, the operator can be notified of the replacement of the air filter as soon as possible. This makes it possible to detect clogging of the air filter at an early stage.

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

If the oil filter differential pressure sensor is provided, it is possible to monitor the state of clogging of the oil filter. Further, if the control unit is configured to notify the replacement of the oil filter based on the output of the differential pressure sensor of the oil filter, the operator can be notified of the replacement of the oil filter as soon as possible. This makes it possible to detect clogging of the oil filter at an early stage.

In the internal combustion engine, the intake line is further provided with a second filter bypass line that branches from between the cyclone filter and the air filter and is connected between the air filter and the engine body. It is preferable that the control unit switches the use of the second filter bypass line based on the output of the intake dust sensor and the 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 the 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 matter in the air can be removed by the cyclone filter, so that adverse effects on the oil filter and the exhaust filter on the downstream side 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 performed according to the degree of cleanliness of the air sucked into the intake line. 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 in the air filter is detected. You can use the line 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 by using the second filter bypass line.

In the present invention, an engine body for generating 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. The intake line includes an intake dust sensor that detects foreign matter contained in the air sucked into the intake line, and a cyclone filter that is connected to the downstream side of the intake dust sensor and removes the foreign matter. , The air filter connected to the downstream side of the cyclone filter and removing foreign matter that has passed through the cyclone filter, and the air filter and the engine body are branched from between the intake dust sensor and the cyclone filter. A first filter bypass line connected between them is provided, and an oil filter for removing foreign matter contained in the lubricating oil circulating inside the engine body is provided inside the engine body. In the control method of an internal combustion engine provided with an exhaust filter for removing particulate matter in the exhaust gas in the exhaust line, foreign matter contained in the air sucked into the intake line is detected by the intake dust sensor. The detection step, the first foreign matter removing step of removing the foreign matter by the cyclone filter, the second foreign matter removing step of removing the foreign matter passing through the cyclone filter by the air filter, and the exhaust filter. The first filter bypass line is used to remove the first foreign matter, which comprises a step of removing the particulate matter in the exhaust gas, and based on the output of the intake dust sensor. And a control method of an internal combustion engine that is controlled so as to skip the second foreign matter removing step.

In the control method of the internal combustion engine of the present invention, since the internal combustion engine provided with the first filter bypass line in the intake line is used, the air sucked into the intake line is sent to the first filter bypass line. Cyclone filters and air filters can be bypassed. Further, since an internal combustion engine provided with an intake dust sensor in the intake line is used, foreign matter contained in the air sucked into the intake line can be detected. Therefore, it is possible to determine whether or not 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 sucked into the intake line is clean air at a level that can be judged not to affect the engine operation, it is not necessary to pass the cyclone filter or the air filter of the intake line. Therefore, by sending such clean air to the bypass line, the first foreign matter removing step and the second foreign matter removing step can be skipped, so that the sucked air can be sent to the engine body quickly and at the same time. The pressure loss due to the air filter can be reduced. Further, in the control method of the internal combustion engine of the present invention, the foreign matter contained in the air sucked into the intake line is configured to be first removed by the cyclone filter, so that there is no concern about clogging due to the foreign matter. The filter allows the removal of foreign matter first. Therefore, the life of filters such as air filters, oil filters, and exhaust filters, which are located on the downstream side of the cyclone filter and may be clogged by foreign matter, can be extended (replacement frequency can be reduced).

According to the internal combustion engine and the control method of the internal combustion engine of the present invention, the pressure loss due to the air filter is reduced, and the life of the filter such as the air filter, the oil filter, and the exhaust filter, which may be clogged by foreign matter, is extended. Can be done.

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 the structure of the conventional internal combustion engine.

Hereinafter, an embodiment of the 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 configuration diagram showing a configuration of an internal combustion engine according to an embodiment of the present invention.
The internal combustion engine 1 of the present embodiment externally uses 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. It is provided with an exhaust line 4 for discharging the air.

The 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. The intake dust sensor 32 detects foreign matter contained in the air sucked into the intake line 3. The cyclone filter 33 is connected to the downstream side of the intake dust sensor 32 and removes 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 it can detect foreign matter contained in the air. Specifically, a general-purpose optical sensor that detects the presence or absence of foreign matter by applying an optical signal to the air flowing through the intake line 3 can be mentioned.

A valve 35 that can be opened and closed is provided downstream of the intake dust sensor 32 (between the intake dust sensor 32 and the cyclone filter 33 and downstream from the branch point to the first filter bypass line 34). Further, a valve 36 that can be opened and closed is provided in the middle of the first filter bypass line 34. When 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 the first filter bypass line 34 is used, the control unit 5 controls 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 is composed of, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like. Then, as an example, a series of processes for realizing various functions are stored in a storage medium or the like in the form of a program, and the CPU reads this program into a RAM or the like to execute information processing / arithmetic processing. As a result, various functions are realized. The program is installed in a ROM or other storage medium in advance, is provided in a state of being stored in a computer-readable storage medium, or is distributed via a wired or wireless communication means. Etc. may be applied. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and 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 the 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 transmitted to the control unit 5. The control unit 5 determines that the air filter 31 is clogged 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 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 the replacement of the air filter 31 based on the output of the air filter differential pressure sensor 37. The notification method is not particularly limited, and examples thereof include a method of notifying by an alarm.

The intake line 3 is further provided with a second filter bypass line 38 that branches from between the cyclone filter 33 and the air filter 31 and is connected between the air filter 31 and the engine body 2. A valve 39 that can be opened and closed is provided in the middle of the second filter bypass line 38. Further, a valve 40 that can be opened and closed is provided downstream of the cyclone filter 33 (between the cyclone filter 33 and the air filter 31 and downstream from the branch point to the second filter bypass line 38). When the 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 the second filter bypass line 38 is used, the control unit 5 controls 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.

Inside the engine body 2, an oil filter 21 is provided to remove foreign substances contained in the lubricating oil circulating inside the engine body 2. The oil filter 21 is provided with an oil filter differential pressure sensor 22 that detects the pressure difference between the inlet pressure and the outlet pressure of the oil filter 21. The oil filter differential pressure sensor 22 detects the 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 transmitted to the control unit 5. The control unit 5 determines that the oil filter 21 is clogged 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. The notification method is not particularly limited, and examples thereof include a method of notifying by an alarm.

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 originally provided with a differential pressure sensor is used.

According to the present embodiment, the following effects are exhibited by the configuration described above.
As described above, in the internal combustion engine 1 of the present embodiment, the intake line 3 is provided with the first filter bypass line 34. By sending the air sucked into the intake line 3 to the first filter bypass line 34, the cyclone filter 33 and the air filter 31 can be bypassed. Further, since the intake dust sensor 32 is provided in the intake line 3, foreign matter contained in the air sucked into the intake line 3 can be detected. In addition, the internal combustion engine 1 is provided with a control unit 5 for switching 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 sucked into the intake line 3 is clean air at a level that can be determined not to affect the engine operation, it is not necessary to pass the cyclone filter 33 or the air filter 31 of the intake line 3. Therefore, by sending such clean air to the bypass line (that is, using the bypass line), the sucked air can be quickly sent to the engine body 2 and the pressure loss due to the air filter 31 can be reduced. Can be done.

In the internal combustion engine 1 of the present embodiment, the foreign matter contained in the air sucked into the intake line 3 is configured to be 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 worry about clogging due to the foreign matter. As a result, the life of filters such as the air filter 31, the oil filter 21, and the exhaust filter 41, which are located on the downstream side of the cyclone filter 33 and may be clogged by foreign matter, can be extended (replacement frequency is reduced).

If the air filter differential pressure sensor 37 is provided, the state of clogging of the air filter 31 can be monitored. Further, 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, the operator can be notified of the replacement of the air filter 31 as soon as possible. This makes it possible to detect clogging of the air filter 31 at an early stage.

If the oil filter differential pressure sensor 22 is provided, the state of clogging 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, the operator can be notified of the replacement of the oil filter 21 as soon as possible. This makes it possible to detect clogging of the oil filter 21 at an early stage.

If the second filter bypass line 38 is provided, the air filter 31 can be bypassed by sending the air from which the 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 adverse effects on the oil filter 21 and the exhaust filter 41 on the downstream side can be suppressed.

Further, 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, the operation is performed according to the degree of cleanliness of the air sucked into the intake line 3. It can be changed. Specifically, a three-stage operation is possible, such as using the first filter bypass line 34, using the second filter bypass line 38, or not using any of the bypass lines. 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, when an abnormality in the air filter 31 is detected, air is used. 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 by using the second filter bypass line 38.

[Control method for internal combustion engine]
Next, an example of the control method of the internal combustion engine of the present invention will be described.
The method for controlling an internal combustion engine of 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, the foreign matter contained in the air sucked 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 foreign matter that has passed through the cyclone filter is removed by the air filter. In the step of removing particulate matter, the particulate matter in the exhaust gas is removed by an exhaust filter. Then, based on the output of the intake dust sensor, the first filter bypass line is used to control the first foreign matter removing step and the second foreign matter removing step to be skipped.

In the following, the case where the control method of the internal combustion engine of the present invention is applied to the internal combustion engine 1 shown in FIG. 1 will be described as an example, but the present invention is not limited to this.

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

(First foreign matter removal step)
In the first foreign matter removing step, the foreign matter is removed by the cyclone filter 33.

(Second foreign matter removal step)
In the second foreign matter removing step, the foreign matter that has passed through the cyclone filter 33 is removed by the air filter 31.

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

Here, in the present embodiment, the first filter bypass line 34 is used based on the output of the intake dust sensor 32, and the first foreign matter removing step and the second foreign matter removing step are controlled to be skipped. .. Specifically, when the intake dust sensor 32 determines that the air sucked into the intake line 3 is clean air at a level that does not affect the engine operation, the valve 35 is closed, the valve 36 is opened, and the first filter is opened. Bypass line 34 is used. As a result, the first foreign matter removing step and the second foreign matter removing step are skipped by bypassing the cyclone filter 33 and the air filter 31.

Further, in the present embodiment, the second filter bypass line 38 is used based on the output of the intake dust sensor 32, and the control of skipping only the second foreign matter removing step is also performed. Specifically, when the intake dust sensor 32 determines that the air sucked into the intake line 3 contains a small amount of foreign matter, the valve 40 is closed, the valve 39 is opened, and the second filter bypass line is opened. 38 is used. As a result, after the foreign matter is removed by the cyclone filter 33 (first foreign matter removing step), only the second foreign matter removing step is skipped by bypassing the air filter 31.

According to the present embodiment, the following effects are exhibited by the configuration described above.
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. By sending the air sucked into the intake line 3 to the first filter bypass line 34, the cyclone filter 33 and the air filter 31 can be bypassed. Further, since the internal combustion engine 1 provided with the intake dust sensor 32 in the intake line 3 is used, foreign matter contained in the air sucked into the intake line 3 can be detected. Therefore, it is possible to determine whether or not to use 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 sucked into the intake line 3 is clean air at a level that can be determined not to affect the engine operation, it is not necessary to pass the cyclone filter 33 or the air filter 31 of the intake line 3. Therefore, by sending such clean air to the bypass line, the first foreign matter removing step and the second foreign matter removing step can be skipped. As a result, the sucked 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 sucked into the intake line 3 is configured to be 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 worry about clogging due to the foreign matter. As a result, the life of filters such as the air filter 31, the oil filter 21, and the exhaust filter 41, which are located on the downstream side of the cyclone filter 33 and may be clogged by foreign matter, can be extended (replacement frequency is reduced).

If the second filter bypass line 38 is used based on the output of the intake dust sensor 32 and is configured to skip only the second foreign matter removing step, the degree of cleanliness of the air sucked into the intake line 3 is adjusted. 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 is configured to skip only the second foreign matter removing step, an abnormality in the air filter 31 is detected. When it is 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, the case where the internal combustion engine 1 is provided with four valves 35, 36, 39, and 40 has been described as an example, but the present invention is not limited to this. That is, the number of valves may be 5 or more. Moreover, you may use a three-way valve.

1 Internal combustion engine 2 Engine body 3 Intake line 4 Exhaust line 5 Control unit 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)

The 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 exhausting the exhaust gas generated from the engine body to the outside,
With
The intake line includes an intake dust sensor that detects foreign matter contained in the air sucked into the intake line, a cyclone filter that is connected to the downstream side of the intake dust sensor and removes the foreign matter, and the cyclone filter. An air filter that is connected to the downstream side and removes foreign matter that has passed through the cyclone filter, branches from between the intake dust sensor and the cyclone filter, and is connected between the air filter and the engine body. A first filter bypass line is provided,
Inside the engine body, an oil filter for removing foreign substances contained in the lubricating oil circulating inside the engine body is provided.
The exhaust line is provided with an exhaust filter for removing particulate matter in the exhaust gas.
An internal combustion engine characterized in that a control unit for switching the use of the first filter bypass line is provided based on the output of the intake dust sensor. The air filter differential pressure sensor for detecting the pressure difference between the inlet pressure and the outlet pressure of the air filter is provided.
The internal combustion engine according to claim 1, wherein the control unit notifies the replacement of the air filter based on the output of the air filter differential pressure sensor. The oil filter differential pressure sensor for detecting the pressure difference between the inlet pressure and the outlet pressure of the oil filter is provided.
The internal combustion engine according to claim 1 or 2, wherein the control unit notifies the replacement of the oil filter based on the output of the oil filter differential pressure sensor. The intake line is further provided with a second filter bypass line that branches from between the cyclone filter and the air filter and is connected between the air filter and the engine body.
The internal combustion engine according to claim 2, wherein the control unit switches the use of the second filter bypass line based on the output of the intake dust sensor and the output of the air filter differential pressure sensor. It is provided with 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 exhausting exhaust gas generated from the engine body to the outside. The intake line includes an intake dust sensor that detects foreign matter contained in the air sucked into the intake line, a cyclone filter that is connected to the downstream side of the intake dust sensor and removes the foreign matter, and the cyclone filter. An air filter that is connected to the downstream side of the engine and removes foreign matter that has passed through the cyclone filter, branches from between the intake dust sensor and the cyclone filter, and is connected between the air filter and the engine body. A first filter bypass line is provided, and an oil filter for removing foreign matter contained in the lubricating oil circulating inside the engine body is provided inside the engine body, and the exhaust line is provided with an oil filter. In the control method of an internal combustion engine provided with an exhaust filter for removing particulate matter in the exhaust gas.
A foreign matter detection step of detecting foreign matter contained in the air sucked into the intake line by the intake dust sensor, and
The first foreign matter removing step of removing the foreign matter by the cyclone filter, and
A second foreign matter removing step of removing foreign matter that has passed through the cyclone filter by the air filter, and
A step of removing particulate matter in the exhaust gas by the exhaust filter, and a step of removing particulate matter.
Have,
An internal combustion engine characterized in that the first filter bypass line is used based on the output of the intake dust sensor, and the first foreign matter removing step and the second foreign matter removing step are controlled to be skipped. Control method.

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