JP2012157255A - Combine harvester with engine exhaust gas purifying facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make regenerative drive of an exhaust gas purifying facility to be timely performed, with the combine harvester working state and the diesel engine load state monitored.SOLUTION: There is provided an exhaust gas purifying facility which purifies with a DOC 26 and a DPF 27 the exhaust gas of a diesel engine 16 installed on a combine harvester and performs regeneration treatment by making the DPF 27 high temperature when detecting exhaust gas blocking with an exhaust gas sensor 42 set on the DPF 27, wherein the engine exhaust gas treating facility of the combine harvester controls to perform stopping the regeneration treatment of the DPF 27 to reversely rotate a cooling fan 24 of a radiator 21 to remove the clogging of the radiator 21 when one of an engine room temperature sensor 41, a radiator water temperature sensor 50 and an exhaust gas temperature sensor 43 detects a higher temperature than a predetermined regeneration stopping temperature.

Description

  The present invention relates to a combine equipped with an exhaust emission control device for an engine.

  In a diesel engine, in order to purify exhaust gas, NO2 is generated from NO in the exhaust gas by the action of an oxidation catalyst of an oxidation catalyst converter (hereinafter referred to as “DOC”) disposed in the exhaust gas passage, and this NO2 is oxidized. Particulate matter such as black smoke in exhaust gas collected by a diesel particulate filter (hereinafter referred to as “DPF”) is incinerated and removed as a material.

JP-A-10-121939 Japanese Patent No. 2006-97652

When performing the regeneration processing of the exhaust gas purification device mounted on the combine, it is necessary to consider the risk of ignition of cereal vegetation vegetated in the field and swarf that is diffused from the rear of the aircraft to the field after threshing.
That is, it is necessary to perform regeneration control so that exhaust gas that has become high temperature due to regeneration processing does not reach the spontaneous firing temperature of cereal straw or sawdust.

  Accordingly, an object of the present invention is to perform regeneration driving of the exhaust gas purifying apparatus in a timely manner while monitoring the working state of the combine and the load state of the diesel engine.

The problems of the present invention are solved by the following technical means.
According to the first aspect of the present invention, a radiator (21) for cooling the diesel engine (16) is provided outside the diesel engine (16), and a filter body (58) is provided outside the radiator (21). A cooling fan (24) is provided between the engine (16) and the radiator (21), and the cooling fan (24) is rotated forward in order to suck cooling air from the outside of the filter body (58) to the radiator (21) side. And a state in which the cooling fan (24) is driven in reverse rotation so as to blow air from the inside to the outside of the filter body (58), and the exhaust gas of the diesel engine (16) is exhausted. Exhaust pressure sensors (42, 42) that are purified by the DOC (26) and DPF (27) provided at the intermediate part of the exhaust path of the pipe (28) and provided respectively on the inlet side and outlet side of the DPF (27) Therefore, when the detected pressure difference is larger than the set value, the DPF (27) is heated to perform regeneration processing of the DPF (27). During the regeneration processing of the DPF (27), An engine room temperature sensor (41) provided near the diesel engine (16), a radiator water temperature sensor (50) for detecting the water temperature of the radiator (21), or an exhaust temperature sensor (43) provided in the exhaust pipe (28). When any one of them detects a temperature equal to or higher than the regeneration stop temperature set individually, the regeneration process of the DPF (27) is interrupted and the cooling fan (24) is automatically switched to a state of being driven in reverse rotation. It was set as the combine provided with the engine exhaust gas purification apparatus characterized by having comprised.

  Invention of Claim 2 provides the crop designation | designated means (47) which designates the kind of harvest cereal, and changes the said reproduction | regeneration stop temperature according to the crop designated by this crop designation | designated means (47) A combine equipped with the engine exhaust gas purification device according to claim 1.

  According to the third aspect of the present invention, the steering lever (33) for performing the turning operation of the airframe, the turning sensor (44) for detecting the operation position of the steering lever (33), and the traveling device (39) are moved forward. And a shift lever (59) that shifts in the reverse direction and a shift sensor (45) that detects the operating position of the shift lever (59). When the turning operation is detected by the turning sensor (44), the regeneration process of the DPF (27) is interrupted and the cooling fan (24) is driven in the reverse rotation. 3. A combine equipped with an engine exhaust gas purification device according to claim 1 or 2, wherein the combine is provided with automatic switching.

  The invention according to claim 4 is characterized in that the exhaust temperature sensor (43) is provided in the vicinity of the outlet of the end of the exhaust pipe (28). The combine was equipped with an engine exhaust purification device.

  According to the first aspect of the present invention, when the exhaust gas of the diesel engine (16) mounted on the combine is purified by the DOC (26) and the DPF (27) and the DPF (27) is clogged, the DPF (27) is removed. The regeneration process is performed by raising the temperature. During this regeneration process, any one of the temperatures detected by the engine room temperature sensor (41), the radiator water temperature sensor (50), or the exhaust temperature sensor (43) is separately provided. If the regeneration stop temperature is exceeded, the regeneration process is interrupted and the cooling fan (24) is reversely rotated to eliminate the clogging of the radiator (21) and the filter body (58), so that the radiator (21) By improving the cooling efficiency, it is possible to reduce the temperature of the diesel engine (16), thereby reducing the risk of fire due to exhaust.

  According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the regeneration stop temperature during the regeneration process of the DPF (27) is set in accordance with the type of grain harvested by the combine. In addition to preventing the risk of fire when harvesting flammable grains, the DPF (27) can be efficiently regenerated when harvesting relatively flammable grains, increasing safety and diesel engines. The output drop of (16) can be prevented.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or claim 2, the combine moves backward or turns, and the high-temperature exhaust gas during the regeneration process of the DPF is sprayed on the rice straw in the field. In such a case, the temperature of the exhaust gas is lowered, so that the risk of fire can be further reduced.

  According to the invention of claim 4, in addition to the effect of the invention of claim 1 or claim 2 or claim 3, it is possible to accurately detect the temperature of the exhaust gas discharged outside the machine, Improvement in the regeneration efficiency of DPF (27) and safety against fire can be achieved at the same time.

It is the whole combine side view which fractured | ruptured a part which shows the Example of this invention. 1 is an overall front sectional view of a part of a combine showing an embodiment of the present invention. It is a power transmission diagram of a drive part. It is a control block diagram of automatic control.

Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.
The combine is equipped with a threshing device 35 on a chassis frame 40 on a crawler traveling device (traveling device) 39, and threshing cereal grains harvested by a cutting and conveying device 34 provided at the front of the machine body by a threshing device 35 and temporarily stored in a grain tank 36. To be stored.

  A steering unit 31 is provided on the front right side of the threshing device 35, and an operator sitting on a seat 32 provided on the threshing unit 31 operates the speed change lever 59 to change the driving speed of the crawler traveling device 39. Steer by operating etc.

  An engine room 30 is provided in the lower left portion of the control unit 31 and the diesel engine 16 is mounted. The first exhaust pipe 25 of the diesel engine 16 is connected to a second exhaust pipe 28 provided along the front-rear direction of the chassis frame 40 through a DOC 26 and a DPF 27 installed on the upper and lower parts of the rear portion of the diesel engine 16, and its exhaust port is directed to the rear of the fuselage. Open toward.

  An engine room temperature sensor 41 (FIG. 4) for detecting the air temperature is provided in the engine room 30, and an exhaust pressure sensor 42 (FIG. 4) for detecting the differential pressure between the exhaust inlet side pressure and the outlet side pressure is provided in the DPF 27. Further, an exhaust temperature sensor 43 is provided near the exhaust port of the second exhaust pipe 28, and a steering detection means comprising a shift sensor 45 for detecting the operation amount of the shift lever 59 and a turning sensor 44 for detecting the operation amount of the steering lever 33 is provided. 46 (FIG. 4) is provided. Further, a harvest setting dial 47 (FIG. 4) is provided near the steering lever 33, which is a harvest setting means for setting whether the harvest is rice or wheat.

  In the transmission diagram shown in FIG. 3, the first output pulley 17 is fixed to the engine output shaft 1 of the engine 16, and the water pump drive shaft 20 in the engine 16 is fixed to the water pump drive shaft 20 protruding outside the machine. A first belt 48 is wound between the pump input pulley 19 and the input pulley 18 of the input shaft 2 of the gear case 6, and the fan drive pulley 14 fixed to the fan side output shaft 5 of the gear case 6 and the fan pulley of the cooling fan 24. The fan drive belt 49 is wound around the belt 15.

  The cooling fan 24 is supported by the shaft end of the water pump drive shaft 20 as a support shaft, and the radiator 21 is disposed outside the cooling fan 24. The support shaft 20 may be a single shaft. A filter body 58 is provided outside the radiator 21 for filtering the dust of cooling air sucked when the cooling fan 24 is rotated forward.

  In the gear case 6, a first gear 7 and a second gear 9 are mounted on the input shaft 2 so that transmission can be turned on and off by a multi-plate clutch 23, and a joint 22 is attached to a shaft end protruding out of the case of the input shaft 2. The generator shaft 4 of the generator 3 is connected to drive the generator 3 constantly.

  A third gear 8 and a fourth gear 11 are loosely fitted to the fan side output shaft 5 in the gear case 6, and a pawl clutch 12 provided between the third gear 8 and the fourth gear 11 is provided with a shifter having a multi-plate clutch plate. By sliding at 13, the rotation is smoothly transmitted to the fan side output shaft 5. The third gear 8 meshes with the first gear 7 and rotates in the reverse direction, and the fourth gear 11 meshes with the second gear 9 via the counter gear 10 and rotates in the normal direction. Therefore, when the pawl clutch 12 is engaged with the third gear 8, the fan-side output shaft 5 rotates in the reverse direction, and when engaged with the fourth gear 11, the fan-side output shaft 5 is rotated forward. The shifter 13 is located in the center of the width of the gear case 6 and performs a shift operation by automatic control.

The radiator 21 is provided with a radiator water temperature sensor 50 (FIG. 4).
FIG. 4 is a control block diagram of automatic control.
In order to detect the inlet pressure and outlet pressure of the DPF 27 and determine the degree of clogging of the particulate matter from the differential pressure, the differential pressure is input from the exhaust pressure sensor 42 to the controller 51, and the differential pressure is greater than or equal to a predetermined pressure. The DPF regeneration drive 54 is output to raise the rotation of the diesel engine 16 and raise the exhaust gas temperature, so that particulate matter clogged in the filter of the DPF 27 is burned and regenerated.

  Further, the air temperature in the engine room 30 from the engine room temperature sensor 41, the water temperature of the radiator 21 from the radiator water temperature sensor 50, and the exhaust temperature from the exhaust temperature sensor 43 are input to the controller 51, and any temperature is set to each. When the regeneration stop temperature is reached, the DPF regeneration drive 54 is stopped and the engine output control 55 is instructed to reduce the output so that the temperature of the diesel engine 16 is not increased, and the fan forward drive 53 is stopped and the fan reverse drive 52 is stopped. And the shifter 13 is shifted to rotate the cooling fan 24 in the reverse direction so as to blow away the dust clogged in the radiator 21.

  Further, when a turning operation is detected from the turning sensor 44 or a reverse operation is detected from the shift sensor 45, the DPF regeneration drive 54 is stopped and the engine output control 55 is instructed to reduce the output, and the temperature of the diesel engine 16 is increased. Do not let it.

  The harvest setting dial 47 sets rice or wheat as the harvest, and the regeneration stop temperature is changed by the harvest. That is, when the harvest is wheat, cereals are more likely to burn than in the case of rice, so the regeneration stop temperature is set low to lower the temperature of the exhaust gas discharged from the second exhaust pipe 28.

  Further, if the turning sensor 44 detects a turning operation or the shift sensor 45 detects a backward operation, the exhaust port of the second exhaust pipe 28 going to the rear of the machine body may go to the planted cereal. When the DPF regeneration drive 54 is being performed, it is interrupted and the output of the diesel engine 16 is lowered so that the exhaust gas having a high temperature is not blown onto the cereal.

  The driving mode setting dial 56 switches the engine output to standard / auto / green, and outputs to the engine output control 55 so that the output is high in standard, the best fuel consumption in auto, and the low fuel consumption in green. To do. The traveling mode may be switched at the speed change position of the continuously variable transmission lever.

  The pillow handling switch 57 is a switch that is pressed when the worker supplies the harvested cereal directly to the threshing device 35. When the pillow handling switch 57 is pressed, the engine output is reduced in the low fuel consumption green mode.

16 Diesel engine 21 Radiator 24 Cooling fan 26 DOC
27 DPF
28 Exhaust pipe 41 Engine room temperature sensor 42 Exhaust pressure sensor 43 Exhaust temperature sensor 46 Steering detection means 47 Harvest setting means 50 Radiator water temperature sensor

Claims (4)

A radiator (21) for cooling the diesel engine (16) is provided outside the diesel engine (16), a filter body (58) is provided outside the radiator (21), and the diesel engine (16) and the radiator (21 A cooling fan (24) is provided between the filter body (58) and the cooling fan (24) is driven to rotate in the forward direction so as to suck cooling air from the outside of the filter body (58) toward the radiator (21). (58) is configured to be switchable to a state in which the cooling fan (24) is driven in reverse rotation to blow air from the inside to the outside,
The exhaust gas of the diesel engine (16) is purified by a DOC (26) and a DPF (27) provided at an intermediate portion of the exhaust path of the exhaust pipe (28), and provided on the inlet side and the outlet side of the DPF (27), respectively. When the difference in pressure detected by the exhaust pressure sensor (42, 42) is larger than a set value, the DPF (27) is heated to regenerate the DPF (27).
During regeneration processing of the DPF (27), an engine room temperature sensor (41) provided near the diesel engine (16) or a radiator water temperature sensor (50) for detecting the water temperature of the radiator (21) or an exhaust pipe ( When any of the exhaust temperature sensors (43) provided in 28) detects a temperature equal to or higher than the regeneration stop temperature set individually, the regeneration process of the DPF (27) is interrupted and the cooling fan (24) A combine equipped with an engine exhaust purification device, wherein the engine is automatically switched to a state of being driven by reverse rotation.   A crop designating means (47) for designating a type of harvested cereal is provided, and the regeneration stop temperature is changed according to the crop designated by the crop designating means (47). A combine equipped with the engine exhaust gas purification device according to Item 1.   A steering lever (33) for performing a turning operation of the airframe, a turning sensor (44) for detecting an operation position of the steering lever (33), and a speed change operation for shifting the traveling device (39) in the forward direction and the reverse direction. A lever (59) and a shift sensor (45) for detecting the operation position of the shift lever (59) are provided, and the reverse shift operation of the shift lever (59) is detected by the shift sensor (45), or When a turning operation is detected by the turning sensor (44), the regeneration process of the DPF (27) is interrupted and the cooling fan (24) is automatically switched to a state of being driven in reverse rotation. A combine equipped with the engine exhaust gas purification device according to claim 1 or 2.   The combine equipped with the engine exhaust gas purification device according to claim 1, wherein the exhaust temperature sensor (43) is provided in the vicinity of the exhaust port at the end of the exhaust pipe (28). .

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