Engine device

Abstract

The present invention provides an engine device which does not depend on a single means to treat emissions containing toxic substances, and which can suppress leakage of the emissions and improve safety. The engine device (1) is operated by fuel containing toxic substances, and is provided with: an exhaust passage (4) through which exhaust gas or leak gas discharged from an engine (2) flows; a plurality of processing devices having different functions, the processing devices being disposed in the exhaust passage (4) and processing emissions; and a path switching valve (12) that is disposed in the exhaust passage (4) and that switches to a processing device that performs processing of the discharge from among the plurality of processing devices. The toxic substance contained in the fuel is ammonia or methanol. An engine device (1) is provided with an external drive pump (8) that causes a leak gas to flow through a leak path (6), and is provided with an exhaust gas purification catalyst device (9), a decontamination device (10), and an intake gas reduction device (11) as a plurality of processing devices.

Description

Technical Field

[0001] The present invention relates to an engine device operating on a fuel containing toxic substances. Background Art

[0002] In the past, there have been structures in engine devices that operate using fuels containing toxic substances such as ammonia and methanol, that is, "harmful substances that should be labeled" in the Safety and Health Act. In addition, there are exhaust purification catalytic devices in engine devices that purify exhaust gas through catalyst reduction. Specifically, the exhaust purification catalytic device injects a reducing agent containing toxic substances into the exhaust gas and reduces the toxic substances contained in the exhaust gas to harmless substances for purification. On the other hand, the catalyst is used to adsorb and decompose the toxic substances of the reducing agent that are not used for reduction (for example, ammonia slipped) for purification. In addition, in the engine device, the fuel gas supplied to the combustion chamber sometimes leaks into the crank chamber (crankcase) as blowby gas. Therefore, it is required to deal with this blowby gas in the engine device.

[0003] For example, in Patent Document 1, an exhaust gas purification system of an internal combustion engine is configured to have a selective reduction catalyst device in the exhaust passage of the internal combustion engine, so that a part of the exhaust passage on the downstream side of the selective reduction catalyst device is formed into two branch passages, and an ammonia adsorption and removal device is respectively provided in the two branch passages, and a flow path switching device for switching the flow of exhaust gas between the two branch passages is provided at the branch point of the two branch passages. A control device for controlling the exhaust gas purification system controls the flow path switching device so that the exhaust gas flows to the branch passage having an ammonia adsorption and removal device of either of the ammonia adsorption and removal devices respectively provided in the two branch passages. In addition, the control device performs the following control: when the detection value of the ammonia concentration detection device reaches a predetermined first set concentration threshold value or more, the flow path switching device is controlled to switch the flow of exhaust gas from the branch passage having one ammonia adsorption and removal device to the branch passage having the other ammonia adsorption and removal device. In the prior art such as Patent Document 1, the exhaust gas purification catalyst device is composed of a selective reduction catalyst device and two ammonia adsorption and removal devices. In addition, for example, Patent Document 2 discloses a blowby gas recirculation device for an internal combustion engine in which a supercharger and an intercooler for cooling intake gas pressurized by the supercharger are arranged on an intake passage, and comprises: an air introduction passage that allows intake gas in the intake passage to flow into a crankcase of the internal combustion engine; and a gas recirculation passage that allows blowby gas in the crankcase of the internal combustion engine to circulate into the intake passage. The gas recirculation passage is connected to the intake passage on the intake upstream side of the supercharger, thereby allowing blowby gas in the crankcase to circulate into the intake passage and flow into the combustion chamber again. In addition, the air introduction passage is connected to the intake passage downstream of the supercharger and upstream of the intercooler, thereby supplying a portion of the air compressed by the supercharger into the crankcase to ventilate the crankcase.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 6743499

[0007] Patent Document 2: Japanese Patent No. 4383983 Summary of the invention

[0008] However, in the case of an engine device that operates using a fuel that does not contain toxic substances, that is, "harmful substances that should be marked" in the Safety and Health Act, an exhaust purification catalytic device that uses a reducing agent containing toxic substances can use a catalyst to adsorb the toxic substances of the reducing agent in the slipped portion that is not used for reduction, and in the case of an abnormality in the exhaust purification catalytic device, the injection of the reducing agent is stopped and the toxic substances can be suppressed from being discharged to the outside. However, in the case of an engine device that operates using a fuel containing toxic substances, the exhaust gas, blowby gas and other emissions discharged from the engine contain toxic substances. Therefore, in the prior art, in the case of an abnormality in the exhaust purification catalytic device, even if the injection of the reducing agent is stopped, the toxic substances contained in the emissions from the engine may not be discharged to the outside and cause harm to people. In addition, in the engine device, when the fuel containing toxic / harmful substances such as ammonia and methanol, that is, "harmful substances that should be marked" in the Safety and Health Act, leaks to a part other than the intake and exhaust pipes, fuel pipes, etc. that must exist, for example, when it leaks from the crankcase as blowby gas, it may cause harm to people. In the prior art such as Patent Document 2, when the leaked gas is treated by a single means such as reflow from the gas recirculation passage to the intake passage, if an abnormality occurs in the single means, the treatment function of the leaked gas may be impaired, and toxic / harmful substances may leak to the outside, resulting in reduced safety.

[0009] In addition, when the engine stops, in the case where the exhaust gas is retained in the exhaust passage and the blow-by gas is retained in the crankcase, in the prior art, since the exhaust purification catalytic device is not working, it is impossible to ventilate the retained exhaust gas, blow-by gas and other emissions, so that toxic substances contained in the emissions may be discharged to the outside. Alternatively, when the blow-by gas in the crankcase is ventilated using air from a supercharger that operates when the engine (internal combustion engine) is running, when the operation of the engine stops, it is impossible to stop the operation of the supercharger and ventilate the blow-by gas retained in the crankcase, so that toxic / harmful substances may leak to the outside.

[0010] Thus, in the prior art, when a single means such as a selective reduction catalyst device is used to treat exhaust gas, blow-by gas and other exhaust products, if the single means is abnormal, the processing function of toxic substances contained in the exhaust is impaired, so that the toxic substances may leak to the outside and reduce safety. In addition, as a treatment for blow-by gas, when only a means of recirculating (reducing) corrosive fuels such as ammonia to the intake passage is applied, the contamination of the intake system components advances, and there is a concern that the replacement interval of the intake system components will be shortened. In contrast, if corrosion-resistant components or corrosion-resistant coatings are used for the intake system components, there is a possibility that the cost will increase and the product power will decrease.

[0011] An object of the present invention is to provide an engine device which does not rely on a single means to handle exhaust and blowby gases containing toxic substances, but can suppress leakage of exhaust and blowby gases and improve safety.

[0012] In order to solve the above-mentioned problems, the engine device of the present invention operates with fuel containing toxic substances, and is characterized in that the engine device includes: an exhaust passage that allows exhaust gas discharged from the engine to flow; a plurality of treatment devices with different functions as devices disposed in the exhaust passage and treating the exhaust; and a path switching valve disposed in the exhaust passage and switching to the treatment device that treats the exhaust among the plurality of treatment devices. In addition, in order to solve the above-mentioned problems, the engine device of the present invention operates with fuel containing toxic substances, and is characterized in that the engine device includes: a plurality of treatment devices with different functions as devices that treat the leaked gas; and a path switching valve that switches the path to the treatment device that treats the leaked gas among the plurality of treatment devices.

[0013] Effects of the Invention

[0014] According to the present invention, an engine device is provided which does not rely on a single means to handle exhaust and blowby gases containing toxic substances, and can suppress leakage of exhaust and blowby gases to improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram showing an example of an engine device according to an embodiment of the present invention.

[0016] Figure 2 This is a graph showing the relationship between the concentration of ammonia contained in the blowby gas input and output to the exhaust gas purification catalyst device and the mixing ratio in the engine device according to the embodiment of the present invention.

[0017] Figure 3 This is a table showing examples of processing devices used according to the state of the engine in the engine device according to the embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram showing an example of an engine device according to a first modified example of the present invention.

[0019] Description of Reference Numerals

[0020] 1…engine device; 2…engine; 3…intake passage; 4…exhaust passage; 5…supercharger; 5a…turbine; 5b…compressor; 6…leakage path; 6a, 6b, 6c…branch paths; 7…filter; 8…external drive pump; 9…exhaust purification catalytic device; 10…harm removal device; 11…intake air reduction device; 12…path switching valve; 13…control unit; 20…cylinder block; 21…cylinder; 21a…combustion chamber; 22…crankcase; 23…cylinder block; 24…piston; 25…cylinder head; 26…crankshaft; 27…connecting rod. DETAILED DESCRIPTION

[0021] An engine device 1 as an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, the engine device 1 includes an engine 2, an intake passage 3, an exhaust passage 4, and a supercharger 5. In addition, the engine device 1 includes a leakage path 6, a filter 7, an external drive pump 8, an exhaust purification catalytic device 9, a detoxification device 10, an intake air reduction device 11, a path switching valve 12, and a control unit 13.

[0022] In this embodiment, the engine device 1 is an engine that operates by injecting fuel containing toxic substances such as ammonia and methanol, i.e., "hazardous substances that should be labeled" in the Safety and Health Act, into the combustion chamber 21a of the engine 2. The fuel is supplied to the combustion chamber 21a as a mixed gas with air.

[0023] The engine 2 is, for example, a four-stroke engine, and is configured by including a cylinder block 20 with a plurality of cylinders 21 and a crankcase 22 . Figure 1 Six cylinders 21 are shown in the figure, but the number of cylinders 21 is not limited to six. Figure 1 As shown, the cylinder 21 is composed of a cylinder body 23 , a piston 24 and a cylinder head 25 .

[0024] The cylinder 23 is formed in a cylindrical shape, for example, in the cylinder block 20, and the piston 24 is slidably accommodated in the cylinder 23. The cylinder head 25 is mounted on the upper side of the cylinder 23, and a combustion chamber 21a is formed inside the cylinder 23 and the cylinder head 25. An ignition device (not shown) for igniting the fuel in the combustion chamber 21a is provided in the cylinder head 25.

[0025] Each cylinder body 23 of the plurality of cylinders 21 is connected to a crankcase 22, and a crankshaft 26 is rotatably supported by the crankcase 22. The piston 24 of each cylinder 21 is connected to the crankshaft 26 via a connecting rod 27, and the reciprocating motion of the piston 24 is converted into the rotational motion of the crankshaft 26 via the connecting rod 27.

[0026] The cylinder head 25 is connected to the intake passage 3 via an intake port (not shown) or the like, and introduces the mixed gas supplied from the intake passage 3 into the combustion chamber 21a. In addition, the cylinder head 25 is connected to the exhaust passage 4 via an exhaust port (not shown) or the like, and exhausts the exhaust gas generated in the combustion chamber 21a into the exhaust passage 4.

[0027] also, Figure 1 , an example in which the intake passage 3 and the plurality of cylinders 21 are directly connected is shown, but in order to connect the intake passage 3 and the plurality of cylinders 21, an intake manifold having a branch flow path branching from the intake passage 3 to the plurality of cylinders 21 may be provided between the intake passage 3 and the engine 2. Figure 1 An example in which the exhaust passage 4 and the multiple cylinders 21 are directly connected is shown, but when the exhaust passage 4 and the multiple cylinders 21 are connected, an exhaust manifold having a branch flow path branching from the exhaust passage 4 to the multiple cylinders 21 can also be arranged between the exhaust passage 4 and the engine 2.

[0028] The intake passage 3 is connected to a plurality of cylinders 21 of the engine 2, and supplies compressed and cooled air to each cylinder 21. A mixed gas of air supplied from the intake passage 3 and fuel supplied from a fuel tank (not shown) is supplied from the intake passage 3 to a combustion chamber 21a of each cylinder 21. A supercharger 5 is provided on the intake passage 3 and on the upstream side in the intake direction to compress the air or the mixed gas of fuel and air flowing through the intake passage 3 and send it to the downstream side in the intake direction.

[0029] In addition, a fuel supply device (not shown) for supplying fuel to the intake passage 3 on the upstream side or downstream side of the supercharger 5 is provided in the intake passage 3. In addition, an air filter (not shown) for purifying new gas and introducing it into the intake passage 3, and an intercooler (not shown) for cooling the air flowing in the intake passage 3 may be provided in the intake passage 3. The fuel supply device controls the supply amount (supply pressure), supply period, etc. of the fuel by the control unit 13. The fuel supply device may be composed of a venturi mixer for mixing the fuel with the air flowing on the upstream side or downstream side of the supercharger 5, or may be composed of a charging valve, an injector, etc. for injecting fuel into the intake passage 3 of each cylinder of the plurality of cylinders 21.

[0030] The exhaust passage 4 allows exhaust gas discharged from the engine 2 to flow through, and is mainly connected to the plurality of cylinders 21 of the engine 2, so that the exhaust gas generated in each cylinder 21 flows through and is discharged as exhaust gas. In addition, the exhaust passage 4 is connected to a leak path 6 connected to the crankcase 22, so that the leak gas flowing through the leak path 6 flows through and is discharged as exhaust gas.

[0031] The exhaust passage 4 is connected to a plurality of treatment devices having different functions for treating exhaust gas, blow-by gas and other exhaust gases flowing through the exhaust passage 4 on the downstream side in the exhaust direction. In the present embodiment, as the plurality of treatment devices, an exhaust purification catalytic device 9 and a harm removal device 10 are used, which use a reducing agent such as urea water and perform purification by catalyst reduction. The exhaust passage 4 has a plurality of branch paths 6a and 6b that branch at a position closer to the downstream side in the exhaust direction than the turbine 5a of the supercharger 5 and are directed toward the plurality of treatment devices. The exhaust purification catalytic device 9 is provided as a treatment device on the branch path 6a, and the harm removal device 10 is provided as a treatment device on the branch path 6a.

[0032] A path switching valve 11 is provided in the exhaust passage 4 at a branch point where the plurality of branch paths 6a and 6b are branched. The path switching valve 11 is controlled by a control unit 12 to switch the path so that the exhaust gas flowing in the exhaust passage 4 flows through any one of the plurality of branch paths 6a and 6b.

[0033] The supercharger 5 compresses the air or mixed gas flowing through the intake passage 3 and sends it to the downstream side in the intake direction. The supercharger 5 includes a turbine 5a and a compressor 5b. The turbine 5a is arranged in the exhaust passage 4, and the compressor 5b is arranged in the intake passage 3. The turbine 5a is rotated by the exhaust gas flowing through the exhaust passage 4, and the compressor 5b is driven by the rotational force of the turbine 5a, thereby compressing the air or mixed gas flowing through the intake passage 3.

[0034] The leak-off path 6 is connected from the crankcase 22 to the exhaust passage 4. The leak-off path 6 is connected to the exhaust passage 4 at a position upstream of the path switching valve 11 in the exhaust direction. Figure 1 2 shows an example in which the leakage path 6 and the exhaust path 4 are directly connected, but a valve such as a check valve that prevents exhaust gas from flowing into the leakage path 6 may be provided between the leakage path 6 and the exhaust path 4. When the combustion gas leaks from the combustion chamber 21a of each cylinder 21 to the crankcase 22 and the blowby gas is generated in the crankcase 22, the blowby gas flows through the leakage path 6. In addition, the leakage path 6 is connected to a plurality of processing devices having different functions for processing the blowby gas of the crankcase 22.

[0035] In the present embodiment, the exhaust gas purification catalyst device 9, the harm removal device 10 and the intake air reduction device 11 are applied as multiple treatment devices, but in the engine device 1 of the present invention, at least two treatment devices among the exhaust gas purification catalyst device 9, the harm removal device 10 and the intake air reduction device 11 are sufficient. The leakage path 6 has multiple branch paths 6a, 6b and 6c that branch off midway and are directed toward the exhaust gas purification catalyst device 9, the harm removal device 10 and the intake air reduction device 11. A path switching valve 12 is provided in the leakage path 6 and at the branch point where the multiple branch paths 6a, 6b and 6c are branched out. The path switching valve 12 is controlled by the control unit 13 to switch the path so that the leakage gas flowing in the leakage path 6 flows in any one of the multiple branch paths 6a, 6b and 6c.

[0036] The filter 7 is provided on the upstream side of the flow direction of the blowby gas in the blowby path 6. The filter 7 separates the oil mist contained in the blowby gas flowing through the blowby path 6 to form an unburned mixed gas, and is constituted by, for example, a demister.

[0037] The externally driven pump 8 is provided in the leakage path 6 at a position downstream of the filter 7 in the flow direction of the leakage gas, and upstream of the path switching valve 12 in the flow direction of the leakage gas. Regardless of whether the engine 2 is operating (running) or not, the externally driven pump 8 is driven to make the leakage gas flow in the leakage path 6 connected to the crankcase 22, thereby ventilating the crankcase 22 and forming a negative pressure in the crankcase 22. Thus, the leakage of the leakage gas in the crankcase 22 from the crankcase 22 at a position other than the leakage path 6, for example, the leakage from the crankcase 22 at the shaft support portion of the crankshaft 26 is suppressed. That is, the externally driven pump 8 functions as a processing device for processing the leakage gas of the crankcase 22.

[0038] In addition, the externally driven pump 8 can be driven with the same intensity to make the leaked gas flow with the same intensity regardless of whether the engine 2 is working (running). Alternatively, it can be formed as follows: when the engine 2 is running, the externally driven pump 8 is driven with a stronger intensity, and on the other hand, when the engine 2 is stopped, the externally driven pump 8 is driven with a weaker intensity. Alternatively, the externally driven pump 8 can be driven until a specified time has passed after the engine 2 stops, and the driving can be stopped after the specified time has passed.

[0039] The exhaust purification catalytic device 9 is arranged in the branch path 6a of the exhaust passage 4 at a position downstream of the path switching valve 12 in the exhaust direction. The exhaust purification catalytic device 9 uses a reducing agent such as urea water and purifies exhaust gas, blow-by gas and other exhausts flowing in the branch path 6a through catalyst reduction. The branch path 6a discharges the exhaust purified by the exhaust purification catalytic device 9. The exhaust purification catalytic device 9 operates according to the operation of the engine 2 and activates the catalyst by heating the catalyst.

[0040] The exhaust gas purification catalytic device 9 is arranged in the exhaust passage 4 at a position downstream of the turbine 5a of the supercharger 5 in the exhaust direction. The branch path 6a of the leakage path 6 toward the exhaust gas purification catalytic device 9 is connected to the exhaust passage 4 at a position downstream of the turbine 5a of the supercharger 5 in the exhaust direction and upstream of the exhaust gas purification catalytic device 9 in the exhaust direction. Figure 1 , an example of direct connection between the branch path 6a and the exhaust passage 4 is shown, but a valve such as a check valve that prevents the exhaust gas from flowing into the branch path 6a may be provided between the branch path 6a and the exhaust passage 4. The exhaust purification catalytic device 9 operates according to the operation of the engine 2 and activates the catalyst by heating the catalyst. When the exhaust purification catalytic device 9 purifies the exhaust gas flowing through the exhaust passage 4 by catalyst reduction, the exhaust purification catalytic device 9 as a treatment device also purifies the blowby gas flowing through the branch path 6a of the blowby path 6 by catalyst reduction.

[0041] For example, Figure 2 2 shows the relationship between the concentration and the mixing ratio of ammonia contained in the exhaust gas and the blow-by gas input and output to the exhaust purification catalyst device 9. Figure 2 In FIG. 1 , the exhaust gas input to the exhaust gas purification catalyst device 9 is depicted by a white circle, and the exhaust gas output from the exhaust gas purification catalyst device 9 is depicted by a black circle. Figure 2 As shown, regardless of the mixing ratio of ammonia, the concentration of ammonia outputted can be sufficiently suppressed by the exhaust gas purification catalytic device 9 .

[0042] The harm removal device 10 is arranged on the branch path 6b of the exhaust passage 4 or the branch path 6b of the leakage path 6 at a position closer to the downstream side of the exhaust direction than the path switching valve 12. Regardless of whether the engine 2 is working (running) or not, the harm removal device 10 is driven, thereby removing the target substance (toxic substances such as ammonia and methanol) contained in the exhaust gas, leakage gas and other emissions flowing to the branch path 6b to make the emissions harmless. The branch path 6b is not connected to the intake passage 3 and the exhaust passage 4, and the emissions harmlessly made by the harm removal device 10 are discharged. The harm removal device 10 is composed of, for example, a gas decomposition type harm removal device, a washing type harm removal device, a combustion type harm removal device or a catalyst decomposition type harm removal device.

[0043] The gas decomposition type harm removal device is a device that flexibly uses decomposition factors to electrochemically decompose the target substance (toxic substance) in the discharge to remove harmful substances. The gas decomposition type harm removal device consumes less power and can be constructed with relatively cheap equipment, but requires a neutralizer. The washing type harm removal device is a device that utilizes the solubility of the target substance (toxic substance) relative to water and a specific liquid medicine, and removes harmful substances from the target substance by spraying a cleaning liquid such as water or sulfuric acid in a mist form on the discharge. The washing type harm removal device can be constructed with relatively cheap equipment, but the size of the equipment will increase.

[0044] In addition, the combustion-type harm removal device is a device that utilizes a burner or the like to burn the exhaust and achieve high temperature to decompose and remove the target substance (toxic substance). The combustion-type harm removal device is suitable for removing harmful substances in high-concentration target substances, but it consumes a large amount of electricity, consumes fuel costs, and the size of the equipment will increase. The catalyst decomposition-type harm removal device is a device that flexibly utilizes a catalyst that promotes the reduction / decomposition of the target substance (toxic substance) contained in the exhaust to remove the harmful substances in the target substance at a low temperature. The catalyst decomposition-type harm removal device can remove the harmful substances in the target substance at a relatively low temperature, but the size of the equipment increases, the price of the equipment becomes expensive, and the operating cost increases. Regarding the engine device 1, consider the above advantages and disadvantages and apply an appropriate harm removal device 10.

[0045] The intake air restoration device 11 restores the blowby gas to the intake passage 3 via the branch passage 6c of the blowby passage 6. The branch passage 6c is connected to the intake passage 3 at a position upstream of the compressor 5b of the supercharger 5 in the intake direction. Figure 1 , an example in which the branch path 6c and the intake passage 3 are directly connected is shown, but a valve such as a check valve that prevents the intake gas from flowing into the branch path 6c may be provided between the branch path 6c and the intake passage 3. In other words, the intake reduction device 11 is composed of the branch path 6c and a portion of the intake passage 3 from the branch path 6c to the supercharger 5, so that the blowby gas flowing into the branch path 6c is mixed with the air or mixed gas flowing in the intake passage 3 to process the blowby gas. The intake passage 3 and the supercharger 5 operate according to the operation of the engine 2 and supply the mixed gas to the engine 2, so the intake reduction device 11 also operates according to the operation of the engine 2 and reduces the blowby gas to the intake passage 3.

[0046] The control unit 13 is a computer such as an ECU (Engine Control Unit) that controls the operation of the engine 2, and includes a CPU, a ROM, a RAM, etc., and is configured to control various parts of the engine 2. The control unit 13 can store various programs for controlling the engine 2 and control the engine 2 by reading and executing the programs.

[0047] In particular, the control unit 13 controls the path switching valve 12 according to the states of the engine 2 and the plurality of treatment devices, and switches the treatment device that performs the treatment of the exhaust among the plurality of treatment devices by switching to any one of the plurality of branch paths 6a and 6b. Figure 3 2 shows an example of a processing device used according to the state of the engine 2. Figure 3 In the figure, a processing device that is mainly used is shown by a black circle, and a processing device that is alternatively used when a malfunction occurs in the main processing device is shown by a white circle.

[0048] Specifically, the control unit 13 monitors whether the engine 2 is running or stopped. When the engine 2 is running, the control unit 13 usually controls the exhaust gas to be processed by the exhaust gas purification catalytic device 9, that is, the path switching valve 12 switches the path of the exhaust gas to the branch path 6a.

[0049] On the other hand, even when the engine 2 is in operation, if an abnormality occurs in the treatment of the exhaust gas based on the exhaust gas purification catalyst device 9, the control unit 13 controls the treatment of the exhaust gas from the exhaust gas purification catalyst device 9 to the harm removal device 10 or the intake air reduction device 11, that is, the path switching valve 12 is used to switch the path of the exhaust gas to the branch path 6b or 6c. In other words, the control unit 13 mainly uses the exhaust gas purification catalyst device 9 during the operation of the engine 2, and alternatively uses the harm removal device 10 according to the status of the engine 2 and multiple treatment devices. At this time, the control unit 13 can be controlled to use the harm removal device 10 preferentially compared with the intake air reduction device 11, and when an abnormality occurs in the harm removal device 10, the control unit 13 controls the treatment of the exhaust gas to switch from the harm removal device 10 to the intake air reduction device 11.

[0050] For example, in order to determine whether the treatment of the exhaust gas based on the exhaust gas purification catalyst device 9 is abnormal, the control unit 12 can monitor whether the exhaust gas purification catalyst device 9 is working in conjunction with the operation of the engine 2, and determine that the treatment of the exhaust gas is abnormal when the exhaust gas purification catalyst device 9 is not working. Alternatively, the engine device 1 is equipped with a sensor for detecting harmful substances such as ammonia and methanol contained in the exhaust gas from the exhaust gas purification catalyst device 9. Moreover, the control unit 13 can determine that the treatment of the exhaust gas is abnormal when harmful substances above a predetermined threshold are detected based on the detection results of the sensor.

[0051] In addition, even when the engine 2 is in operation, if the exhaust gas treatment by the exhaust gas purification catalytic device 9 is insufficient, the control unit 13 controls the exhaust gas treatment to be switched from the exhaust gas purification catalytic device 9 to the harm removal device 10 or the intake air reduction device 11, that is, the path of the exhaust gas is switched to the branch path 6b by using the path switching valve 12. At this time, the control unit 13 can control the harm removal device 10 to be used preferentially over the intake air reduction device 11, and when an abnormality occurs in the harm removal device 10, the control unit 13 controls the exhaust gas treatment to be switched from the harm removal device 10 to the intake air reduction device 11.

[0052] For example, in order to determine whether the exhaust gas treatment by the exhaust gas purification catalytic device 9 is sufficient, the engine device 1 is equipped with a torque sensor for detecting the load (torque) of the engine 2 and a temperature sensor for detecting the temperature of the exhaust gas flowing through the exhaust passage 4. Furthermore, the control unit 13 can determine that the exhaust gas treatment is insufficient when a decrease in the exhaust gas temperature (for example, a decrease below a predetermined temperature threshold) is detected along with a decrease in the load of the engine 2 (for example, a decrease below a predetermined torque threshold) based on the detection results of the torque sensor and the temperature sensor.

[0053] Furthermore, when the engine 2 stops, the control unit 13 controls to switch the treatment of the exhaust from the exhaust purification catalytic device 9 to the harm removal device 10, that is, the path of the exhaust is switched to the branch path 6b using the path switching valve 12. In other words, the control unit 13 mainly uses the exhaust purification catalytic device 9 after the engine 2 stops, and alternatively uses the harm removal device 10 according to the status of the engine 2 and multiple treatment devices.

[0054] Furthermore, when the engine 2 is stopped urgently, the control unit 13 may mainly use the detoxification device 10 and alternatively use the exhaust gas purification catalytic device 9 according to the states of the engine 2 and a plurality of treatment devices.

[0055] As described above, according to the present embodiment, the engine device 1 is an engine device 1 that operates using a fuel containing toxic substances, and is provided with: an exhaust passage 4 that allows exhaust gas, blowby gas and other exhaust gases discharged from the engine 2 to flow; a plurality of treatment devices (exhaust purification catalytic device 9, harm removal device 10 and intake air reduction device 11) with different functions as devices disposed in the exhaust passage 4 and treating the exhaust; and a path switching valve 12, which is disposed in the exhaust passage 4 and switches to a treatment device that treats the exhaust among the plurality of treatment devices. The harm removal device 10 of the treatment device is a gas decomposition type harm removal device, a washing type harm removal device, a combustion type harm removal device or a catalyst decomposition type harm removal device. The toxic substance contained in the fuel is ammonia or methanol.

[0056] Thus, even when an abnormality occurs in one of the treatment devices for treating the exhaust, that is, when a single abnormality occurs, the engine device 1 can switch to another treatment device to treat the exhaust. Therefore, the treatment of the exhaust containing toxic substances does not depend on a single means, and even when a single abnormality occurs, the toxic substances contained in the exhaust can be prevented from leaking to the outside, which helps to improve safety. In addition, in the present embodiment, the intake passage 3 is not used for the treatment of the exhaust, so the intake passage 3, the compressor 5b of the supercharger 5 and other intake system components can be prevented from being contaminated by the exhaust, and the replacement interval of the intake system components can be prolonged. In addition, the intake system components can be constructed without using corrosion-resistant components or corrosion-resistant coatings for the exhaust, so the cost increase of the intake system components can be suppressed, and the commercial power of the intake system components can be suppressed.

[0057] In addition, according to the present embodiment, the engine device 1 comprises: a leakage path 6, which is connected to the exhaust passage 4 from the crankcase 22 at a position upstream of the path switching valve 12 in the exhaust direction; and an external drive pump 8, which allows the leakage gas generated in the crankcase 22 to flow in the leakage path 6.

[0058] Thus, even when the engine 2 stops running, the engine device 1 can ventilate the crankcase 22 by using the external drive pump 8 and form a negative pressure in the crankcase 22. Therefore, even when the engine 2 stops running, the toxic substances in the blowby gas retained in the crankcase 22 can be removed, thereby suppressing the risk of pollution of the surrounding environment and contributing to improving safety. In addition, the leakage path 6 is connected to the exhaust passage 4, so that not only the exhaust gas from the engine 2 but also the blowby gas from the crankcase 22 can be processed in the processing device.

[0059] More specifically, according to this embodiment, the engine device 1 includes: a leakage path 6, which is connected to the crankcase 22; and an external drive pump 8, which allows the leakage gas to flow in the leakage path 6, and, as multiple processing devices, includes an exhaust purification catalytic device 9, a harm removal device 10 and an intake air reduction device 11.

[0060] Thus, the engine device 1 can selectively switch to any one of the exhaust gas purification catalytic device 9, the abatement device 10, and the intake air reduction device 11 to process the blowby gas according to the states of the engine 2 and each processing device.

[0061] In addition, according to the present embodiment, the engine device 1 usually uses the exhaust gas purification catalyst device 9 to treat the exhaust gas during engine operation. On the other hand, when an abnormality occurs in the treatment of the exhaust gas based on the exhaust gas purification catalyst device 9, the treatment of the exhaust gas is switched from the exhaust gas purification catalyst device 9 to the harm removal device 10 or the intake air reduction device 11.

[0062] Thus, even when an abnormality occurs in the exhaust gas purification catalytic device 9 , the engine device 1 can smoothly process the exhaust gas using the abatement device 10 or the intake air reduction device 11 .

[0063] Alternatively, according to this embodiment, the engine device 1 usually uses the exhaust purification catalyst device 9 to treat the exhaust during engine operation. On the other hand, when the treatment of the exhaust based on the exhaust purification catalyst device 9 is insufficient, the treatment of the exhaust is switched from the exhaust purification catalyst device 9 to the detoxification device 10 or the intake air reduction device 11.

[0064] Thus, even when the treatment of the leaked gas based on the exhaust purification catalytic device 9 is insufficient due to changes or abnormalities in the operating state of the engine occurring outside the exhaust purification catalytic device 9, such as a reduction in the load of the engine 2 or a reduction in the temperature of the exhaust gas, the engine device 1 can smoothly treat the exhaust using the harm removal device 10 or the intake air reduction device 11.

[0065] Alternatively, according to the present embodiment, the engine device 1 treats exhaust gas using the exhaust gas purification catalytic device 9 while the engine 2 is running, and switches the exhaust gas treatment from the exhaust gas purification catalytic device 9 to the abatement device 10 when the engine 2 is stopped.

[0066] Thus, even when the exhaust gas cannot be treated by the exhaust gas purification catalytic device 9 due to the stop of the engine 2, the engine device 1 can smoothly treat the exhaust gas by the detoxification device 10. In addition, by suppressing the treatment of the blowby gas by the intake reduction device 11, it is possible to suppress the contamination of the intake system components such as the intake passage 3 and the compressor 5b of the supercharger 5 by the blowby gas, thereby making it possible to prolong the replacement interval of the intake system components. In addition, the intake system components can be constructed without using corrosion-resistant components or corrosion-resistant coatings for the blowby gas, thereby suppressing the increase in the cost of the intake system components and suppressing the decline in the commercial power of the intake system components.

[0067] Furthermore, in the above-described embodiment, an example in which the engine device 1 includes the exhaust gas purification catalytic device 9, the detoxification device 10, and the intake air reduction device 11 as a plurality of treatment devices has been described, but the present invention is not limited to this example.

[0068] In the first variant, the engine device 1 is provided with an exhaust gas purification catalyst device 9 and a harm removal device 10 as a plurality of treatment devices, but is not provided with an intake air reduction device 11. Even in the first variant, as in the above-mentioned embodiment, the control unit 13 controls the path switching valve 12 according to the state of the engine 2 and the plurality of treatment devices and switches to any one of the plurality of branch paths 6a and 6b, thereby switching the treatment device for treating the blowby gas to the exhaust gas purification catalyst device 9 or the harm removal device 10. Thus, the engine device 1 can selectively switch to the exhaust gas purification catalyst device 9 or the harm removal device 10 appropriately according to the state of the engine 2 and each treatment device to treat the blowby gas.

[0069] In addition, in the above-mentioned embodiment, an example in which the leakage path 6 is connected to the exhaust passage 4 in order to switch to the exhaust purification catalytic device 9 or the harm removal device 10 to treat the blowby gas as the exhaust, and an example in which the engine device 1 is equipped with the exhaust purification catalytic device 9, the harm removal device 10 and the intake air reduction device 11 as multiple treatment devices are described, but the present invention is not limited to this example. For example, in the first variant, the engine device 1 can be configured to switch to the exhaust purification catalytic device 9 or the harm removal device 10 and only treat the exhaust gas as the exhaust, such as Figure 4 As shown, the leakage path 6 connected to the exhaust passage 4 may be omitted. Figure 4 , an example in which the engine device 1 does not have the leakage path 6 is shown, but in other examples, the engine device 1 may have a leakage path 6 connected to other processing devices instead of the exhaust passage 4. Moreover, in the second variant, as multiple processing devices, the engine device 1 has an exhaust gas purification catalytic device 9 and a harm removal device 10 but does not have an intake air reduction device 11. Even in the second variant, as in the above-mentioned embodiment, the control unit 13 controls the path switching valve 12 according to the state of the engine 2 and multiple processing devices, and switches the processing device for processing the leakage gas to the exhaust gas purification catalytic device 9 or the harm removal device 10 by switching to any one of the multiple branch paths 6a and 6b. As a result, the engine device 1 can process the leakage gas by selectively switching to the exhaust gas purification catalytic device 9 or the harm removal device 10 according to the state of the engine 2 and each processing device.

[0070] In addition, since the blow-by gas is not processed by the intake air reduction device 11, it is possible to prevent the intake system components such as the intake passage 3 and the compressor 5b of the supercharger 5 from being contaminated by the blow-by gas, thereby making it possible to extend the replacement interval of the intake system components. In addition, the intake system components can be constructed without using corrosion-resistant components or corrosion-resistant coatings for the blow-by gas, thereby preventing the increase in the cost of the intake system components and preventing the decline in the commercial value of the intake system components.

[0071] Specifically, in the second modification, even when the engine 2 is in operation, the control unit 13 normally controls the exhaust gas purification catalytic device 9 to perform the blowby gas treatment.

[0072] On the other hand, even when the engine 2 is in operation, if the treatment of the blow-by gas based on the exhaust purification catalytic device 9 is abnormal, the control unit 13 controls to switch the treatment of the blow-by gas from the exhaust purification catalytic device 9 to the harm removal device 10. In other words, the control unit 13 mainly uses the exhaust purification catalytic device 9 during the operation of the engine 2, and alternatively uses the harm removal device 10 according to the status of the engine 2 and multiple treatment devices. Thus, even if the exhaust purification catalytic device 9 is abnormal, the engine device 1 can smoothly treat the blow-by gas using the harm removal device 10.

[0073] In addition, even when the engine 2 is in operation, if the blowby gas is not sufficiently processed by the exhaust gas purification catalyst device 9, the control unit 13 controls to switch the blowby gas processing from the exhaust gas purification catalyst device 9 to the harm removal device 10. Thus, even when the blowby gas is not sufficiently processed by the exhaust gas purification catalyst device 9 due to a change or abnormality in the operating state of the engine 2 other than the exhaust gas purification catalyst device 9, such as a decrease in the load of the engine 2 or a decrease in the temperature of the exhaust gas, the engine device 1 can smoothly process the blowby gas using the harm removal device 10.

[0074] Furthermore, in the second variant, when the engine 2 stops, the control unit 13 is also controlled to switch the treatment of the blow-by gas from the exhaust purification catalytic device 9 to the harm removal device 10. Thus, even when the blow-by gas cannot be treated by the exhaust purification catalytic device 9 due to the stop of the engine 2, the engine device 1 can smoothly treat the blow-by gas by using the harm removal device 10. In addition, in the second variant, it can also be formed that: when the engine 2 stops urgently, the control unit 13 mainly uses the harm removal device 10, and uses the exhaust purification catalytic device 9 as an alternative according to the status of the engine 2 and multiple treatment devices.

[0075] Alternatively, in the third modification, the engine device 1 is provided with the exhaust gas purification catalyst device 9 and the intake air reduction device 11 as multiple processing devices, but is not provided with the detoxification device 10. In the third modification, as in the above-mentioned embodiment, the control unit 13 controls the path switching valve 12 according to the state of the engine 2 and the multiple processing devices, and switches the processing device for processing the blowby gas to the exhaust gas purification catalyst device 9 or the intake air reduction device 11 by switching to any one of the multiple branch paths 6a and 6c. Thus, the engine device 1 can process the blowby gas by appropriately and selectively switching to the exhaust gas purification catalyst device 9 or the intake air reduction device 11 according to the state of the engine 2 and each processing device.

[0076] Specifically, in the third modification, even when the engine 2 is in operation, the control unit 13 normally controls the exhaust gas purification catalytic device 9 to perform the blowby gas treatment.

[0077] On the other hand, even when the engine 2 is in operation, if the treatment of the blowby gas based on the exhaust purification catalyst device 9 is abnormal, the control unit 13 controls to switch the treatment of the blowby gas from the exhaust purification catalyst device 9 to the intake air reduction device 11. In other words, the control unit 13 mainly uses the exhaust purification catalyst device 9 during the operation of the engine 2, and alternatively uses the intake air reduction device 11 according to the status of the engine 2 and multiple treatment devices. As a result, even if the exhaust purification catalyst device 9 is abnormal, the engine device 1 can smoothly treat the blowby gas using the intake air reduction device 11.

[0078] Furthermore, even when the engine 2 is in operation, if the blowby gas processing by the exhaust gas purification catalyst device 9 is insufficient, the control unit 13 controls to switch the blowby gas processing from the exhaust gas purification catalyst device 9 to the intake air reduction device 11. Thus, even when the blowby gas processing by the exhaust gas purification catalyst device 9 is insufficient due to a change or abnormality in the operating state of the engine 2 other than the exhaust gas purification catalyst device 9, such as a decrease in the load of the engine 2 or a decrease in the temperature of the exhaust gas, the engine device 1 can smoothly process the blowby gas by using the intake air reduction device 11.

[0079] Furthermore, in the third variant, when the engine 2 stops, the intake air reduction device 11 does not work, so the control unit 13 can be controlled to maintain the treatment of the blowby gas to the exhaust purification catalytic device 9. Similarly, in the third variant, when the engine 2 stops urgently, the intake air reduction device 11 does not work, so the control unit 13 can mainly use the exhaust purification catalytic device 9.

[0080] The present invention can be modified appropriately within the scope of the gist or concept of the invention that can be understood from the claims and the entire specification, and the technical concept of the present invention also includes an engine device accompanied by such modification.

[0081] [Additional Notes on the Invention]

[0082] The following is a supplementary note of the summary of the invention extracted from the above-mentioned embodiment. In addition, each structure and each processing function described in the following supplementary note can be selected and combined arbitrarily.

[0083] <Note 1>

[0084] An engine device, which operates using a fuel containing a toxic substance, is characterized in that:

[0085] The engine device comprises:

[0086] an exhaust passage for passing exhaust discharged from the engine;

[0087] a plurality of treatment devices having different functions and being devices disposed in the exhaust passage and processing the exhaust; and

[0088] A path switching valve is disposed in the exhaust passage and switches to the treatment device that performs treatment of the exhaust material among the plurality of treatment devices.

[0089] <Note 2>

[0090] The engine device according to Supplementary Note 1 is characterized in that:

[0091] The engine device comprises:

[0092] a leakage path connected to the exhaust passage at a position upstream of the path switching valve in the exhaust direction; and

[0093] An externally driven pump causes the blowby gas to flow in the blowby path.

[0094] <Note 3>

[0095] The engine device according to Supplementary Note 1 is characterized in that:

[0096] The engine device includes an exhaust gas purification catalytic device and a detoxification device as the plurality of treatment devices.

[0097] <Note 4>

[0098] The engine device according to Supplementary Note 3 is characterized in that:

[0099] When an abnormality occurs in the treatment of the exhaust gas by the exhaust gas purification catalytic device during engine operation, the treatment of the exhaust gas is switched from the exhaust gas purification catalytic device to the abatement device.

[0100] <Note 5>

[0101] The engine device according to Supplementary Note 3 is characterized in that:

[0102] When the exhaust gas purification catalytic device is insufficient for treating the exhaust gas during engine operation, the exhaust gas purification catalytic device is used to treat the exhaust gas, thereby switching the exhaust gas treatment from the exhaust gas purification catalytic device to the abatement device.

[0103] <Note 6>

[0104] The engine device according to Supplementary Note 3 is characterized in that:

[0105] The exhaust gas purification catalytic device is used to treat the exhaust gas when the engine is running, and when the engine is stopped, the exhaust gas purification catalytic device is used to treat the exhaust gas.

[0106] <Note 7>

[0107] The engine device according to Supplementary Note 3 is characterized in that:

[0108] The harm removal device is a gas decomposition type harm removal device, a washing type harm removal device, a combustion type harm removal device or a catalyst decomposition type harm removal device.

[0109] <Note 8>

[0110] The engine device according to Supplementary Note 1 is characterized in that:

[0111] The toxic substance is ammonia or methanol.

[0112] <Note 9>

[0113] The engine device according to Supplementary Note 1 is characterized in that:

[0114] The engine device comprises:

[0115] A plurality of processing devices having different functions as devices for processing leaked gas; and

[0116] A path switching valve switches to the processing device that performs processing of the leaked gas among the plurality of processing devices.

[0117] <Note 10>

[0118] The engine device according to Supplementary Note 9 is characterized in that:

[0119] The engine device includes an externally driven pump that causes the blowby gas to flow through a blowby path.

[0120] <Note 11>

[0121] The engine device according to Supplementary Note 10 is characterized in that:

[0122] The engine device includes an exhaust gas purification catalytic device and a detoxification device as the plurality of treatment devices.

[0123] <Note 12>

[0124] The engine device according to Supplementary Note 11 is characterized in that:

[0125] When an abnormality occurs in the treatment of the blowby gas by the exhaust purification catalytic device during engine operation, the treatment of the blowby gas is switched from the exhaust purification catalytic device to the abatement device.

[0126] <Note 13>

[0127] The engine device according to Supplementary Note 11 is characterized in that:

[0128] When the treatment of the blow-by gas by the exhaust purification catalytic device is insufficient during engine operation, the treatment of the blow-by gas is switched from the exhaust purification catalytic device to the abatement device.

[0129] <Note 14>

[0130] The engine device according to Supplementary Note 11 is characterized in that:

[0131] The blow-by gas is treated by the exhaust gas purification catalytic device during engine operation, and when the engine is stopped, the blow-by gas treatment is switched from the exhaust gas purification catalytic device to the abatement device.

[0132] <Note 15>

[0133] The engine device according to Supplementary Note 10 is characterized in that:

[0134] The engine device includes an exhaust gas purification catalytic device and an intake air reduction device as the plurality of processing devices.

[0135] <Note 16>

[0136] The engine device according to Supplementary Note 15 is characterized in that:

[0137] When an abnormality occurs in the treatment of the blowby gas by the exhaust gas purification catalyst device during engine operation, the treatment of the blowby gas is switched from the exhaust gas purification catalyst device to the intake air reduction device.

[0138] <Note 17>

[0139] The engine device according to Supplementary Note 15 is characterized in that:

[0140] When the treatment of the blowby gas by the exhaust gas purification catalyst device is insufficient during engine operation, the treatment of the blowby gas is switched from the exhaust gas purification catalyst device to the intake air reduction device.

[0141] <Note 18>

[0142] The engine device according to Supplementary Note 10 is characterized in that:

[0143] The engine device includes an exhaust gas purification catalytic device, a detoxification device, and an intake air reduction device as the plurality of treatment devices.

[0144] <Note 19>

[0145] The engine device according to Supplementary Note 18 is characterized in that:

[0146] When an abnormality occurs in the treatment of the blowby gas by the exhaust gas purification catalytic device during engine operation, the treatment of the blowby gas is switched from the exhaust gas purification catalytic device to the abatement device or the intake air reduction device.

[0147] <Note 20>

[0148] The engine device according to Supplementary Note 18 is characterized in that:

[0149] When the blowby gas treatment by the exhaust gas purification catalytic device is insufficient during engine operation, the blowby gas treatment is switched from the exhaust gas purification catalytic device to the abatement device or the intake air reduction device.

[0150] <Note 21>

[0151] The engine device according to Supplementary Note 18 is characterized in that:

[0152] The blow-by gas is treated by the exhaust gas purification catalytic device during engine operation, and when the engine is stopped, the blow-by gas treatment is switched from the exhaust gas purification catalytic device to the abatement device.

[0153] <Note 22>

[0154] The engine device according to Supplement 11 or 18 is characterized in that:

[0155] The harm removal device is a gas decomposition type harm removal device, a washing type harm removal device, a combustion type harm removal device or a catalyst decomposition type harm removal device.

[0156] <Note 23>

[0157] The engine device according to Supplementary Note 9 is characterized in that:

[0158] The toxic substance is ammonia or methanol.

Claims

1. An engine device that operates using a fuel containing a toxic substance, characterized in that: The engine device comprises: an exhaust passage for passing exhaust discharged from the engine; a plurality of treatment devices having different functions and being devices disposed in the exhaust passage and processing the exhaust; as well as A path switching valve is disposed in the exhaust passage and switches to the treatment device that performs treatment of the exhaust material among the plurality of treatment devices.

2. The engine device according to claim 1, characterized in that: The engine device comprises: a leakage path connected to the exhaust passage at a position upstream of the path switching valve in the exhaust direction; and An externally driven pump causes the blowby gas to flow in the blowby path.

3. The engine device according to claim 1, characterized in that: The engine device includes an exhaust gas purification catalytic device and a detoxification device as the plurality of treatment devices.

4. The engine device according to claim 3, characterized in that: When an abnormality occurs in the treatment of the exhaust gas by the exhaust gas purification catalytic device during engine operation, the treatment of the exhaust gas is switched from the exhaust gas purification catalytic device to the abatement device.

5. The engine device according to claim 3, characterized in that: When the exhaust gas purification catalytic device is insufficient for treating the exhaust gas during engine operation, the exhaust gas purification catalytic device is used to treat the exhaust gas, thereby switching the exhaust gas treatment from the exhaust gas purification catalytic device to the abatement device.

6. The engine device according to claim 3, characterized in that: The exhaust gas purification catalytic device is used to treat the exhaust gas when the engine is running, and when the engine is stopped, the exhaust gas purification catalytic device is used to treat the exhaust gas.

7. The engine device according to claim 3, characterized in that: The harm removal device is a gas decomposition type harm removal device, a washing type harm removal device, a combustion type harm removal device or a catalyst decomposition type harm removal device.

8. The engine device according to claim 1, characterized in that: The toxic substance is ammonia or methanol.

9. The engine device according to claim 1, characterized in that: The engine device comprises: A plurality of processing devices having different functions as devices for processing leaked gas; and A path switching valve switches to the processing device that performs processing of the leaked gas among the plurality of processing devices.

10. The engine device according to claim 9, characterized in that: The engine device includes an externally driven pump that causes the blowby gas to flow through a blowby path.

11. The engine device according to claim 10, characterized in that: The engine device includes an exhaust gas purification catalytic device and a detoxification device as the plurality of treatment devices.

12. The engine device according to claim 11, characterized in that: When an abnormality occurs in the treatment of the blowby gas by the exhaust purification catalytic device during engine operation, the treatment of the blowby gas is switched from the exhaust purification catalytic device to the abatement device.

13. The engine device according to claim 11, characterized in that: When the treatment of the blow-by gas by the exhaust purification catalytic device is insufficient during engine operation, the treatment of the blow-by gas is switched from the exhaust purification catalytic device to the abatement device.

14. The engine device according to claim 11, characterized in that: The blow-by gas is treated by the exhaust gas purification catalytic device during engine operation, and when the engine is stopped, the blow-by gas treatment is switched from the exhaust gas purification catalytic device to the abatement device.

15. The engine device according to claim 10, characterized in that: The engine device includes an exhaust gas purification catalytic device and an intake air reduction device as the plurality of processing devices.

16. The engine device according to claim 15, characterized in that When an abnormality occurs in the treatment of the blowby gas by the exhaust gas purification catalyst device during engine operation, the treatment of the blowby gas is switched from the exhaust gas purification catalyst device to the intake air reduction device.

17. The engine device according to claim 15, characterized in that: When the treatment of the blowby gas by the exhaust gas purification catalyst device is insufficient during engine operation, the treatment of the blowby gas is switched from the exhaust gas purification catalyst device to the intake air reduction device.

18. The engine device according to claim 10, characterized in that: The engine device includes an exhaust gas purification catalytic device, a detoxification device, and an intake air reduction device as the plurality of treatment devices.

19. The engine device according to claim 18, characterized in that When an abnormality occurs in the treatment of the blowby gas by the exhaust gas purification catalytic device during engine operation, the treatment of the blowby gas is switched from the exhaust gas purification catalytic device to the abatement device or the intake air reduction device.

20. The engine device according to claim 18, characterized in that When the blowby gas treatment by the exhaust gas purification catalytic device is insufficient during engine operation, the blowby gas treatment is switched from the exhaust gas purification catalytic device to the abatement device or the intake air reduction device.

21. The engine device according to claim 18, characterized in that The blow-by gas is treated by the exhaust gas purification catalytic device during engine operation, and when the engine is stopped, the blow-by gas treatment is switched from the exhaust gas purification catalytic device to the abatement device.

22. The engine device according to claim 11 or 18, characterized in that: The harm removal device is a gas decomposition type harm removal device, a washing type harm removal device, a combustion type harm removal device or a catalyst decomposition type harm removal device.

23. The engine device according to claim 9, characterized in that The toxic substance is ammonia or methanol.

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