JP4278596B2 - Control device for engine cooling - Google Patents

Description

The present invention relates to a control device for cooling an engine , and more specifically, a normal wind mode for sucking outside air through a dust removal net and supplying the engine cooling unit, and the normal wind mode with the air flow direction reversed. Ventilation means configured to be switchable to a reverse wind mode for allowing air to be supplied to the dust removal net, and after executing the forward wind mode for the set time for forward wind, the execute the reverse wind mode for the set time for the reverse wind The present invention relates to an engine cooling control device provided with ventilation control means for controlling the operation of the ventilation means so as to perform ventilation operation processing that repeats the above.

The controller for cooling the engine having the above-described configuration allows the dust deposited on the dust removal net during operation in the normal wind mode to suck outside air to be supplied to the engine cooling unit to be removed from the machine by operating in the reverse wind mode. by blowing removed, but in which to ensure sufficient cooling airflow even dust often work environment can be cooled better engine, a control device for such an engine cooling, conventional Then, there was what was constituted as follows.

  That is, when the engine is stopped while the engine is operating and the operation of the ventilation means is controlled so that the ventilation control means performs the ventilation operation process, it is determined whether or not the ventilation means is in the normal wind mode when the engine is stopped. If it is memorized and it is memorized that it is not in the normal wind mode at that time, the operation of the ventilation means may be controlled so as to switch to the normal wind mode when the engine is started, or separately from such a configuration. If the ventilation means is in the reverse wind mode when the main switch is turned off, the operation of the ventilation means is controlled to switch to the normal wind mode as the main switch is turned off. (For example, refer to Patent Document 1). The ventilation means includes an electric motor type switching operation means for performing a switching operation between the normal wind mode and the reverse wind mode, and an operation position sensor as an operation position detecting means for detecting an operation position of the switching operation means. The switching operation means performs switching operation between the normal wind mode and the reverse wind mode based on the detection information of the operation position sensor.

JP 2001-263063 A

The above conventional arrangement, if for example by operating off the main switch, such as to stop the engine if or engine in a state where the engine is in such cases as emergency stop, ventilation means is switched to headwinds mode Even when the engine is stopped, the ventilation means is switched to the normal wind mode when the engine is started next time.

Above Symbol conventional configuration, when the ventilating operation process, when the switching operation means switching headwinds mode ventilation means from the favorable wind mode, it is conceivable a case that would cause abnormal operation in the middle of the switching operation In the conventional configuration, no consideration is given to such abnormal operation. When an operation abnormality occurs during the switching operation from the normal wind mode to the reverse wind mode, as a general process, the control for the ventilation means is immediately stopped and an alarm is activated when the operation abnormality occurs. However, if the configuration is such that the control is immediately stopped when an operation abnormality is detected in this way, the ventilation means is switched to the headwind mode when the abnormality occurs, If the engine is erroneously continuously operated in such a state, there is a possibility that the state in which the cooling air is not passed through the engine cooling portion continues for a long time and the temperature of the engine increases greatly.

It is an object of the present invention to secure a sufficient cooling air volume even in a dusty work environment by removing dust adhering and accumulating on the dust removal net during operation in the normal wind mode by operating in the reverse wind mode. yet as it can be to cool the engine, it is the operation in the headwind mode that it possible to avoid that the temperature of the engine is increased greatly.

The first characteristic configuration of the present invention is a normal wind mode in which outside air is sucked through the dust removal net and supplied to the engine cooling unit, and air is supplied to the dust removal net with the air flow direction reversed. A ventilation means configured to be able to switch to a reverse wind mode for allowing ventilation, and a ventilation operation in which the forward wind mode is executed for the set time for forward wind and then the reverse wind mode is executed for the set time for the reverse wind In a control device for cooling the engine provided with ventilation control means for controlling the operation of the ventilation means so as to perform processing, switching operation means for switching the forward wind mode and the reverse wind mode on the ventilation means If, and an operation position detecting means for detecting the operating position of the switching operation unit, the ventilation control means executes the switching operation from the downwind mode to the headwind mode When is the favorable wind measured switching time from the mode to the headwind mode, and the operating position of the changeover operation device and monitored based on detection of the operation position detecting means, by the measurement and monitoring, the The switching time exceeds the switching operation monitoring time set to the time required to switch the operation position of the switching operation means from the forward wind operation position for the normal wind mode to the reverse wind operation position for the reverse wind mode. Regardless, when it is detected that the switching operation means has not reached the operating position for headwind, it is determined that an operation abnormality has occurred during the switching operation from the front wind mode to the headwind mode, A forward wind mode return process is performed to control the operation of the ventilation means so as to return to the normal wind mode.

According to the first characteristic configuration, the ventilation control unit performs the ventilation operation process by repeatedly executing the headwind mode for the set time for the forward wind and then executing the headwind mode for the set time for the headwind. While the outside air is sucked through the dust removal net and supplied to the engine cooling section by the operation in, dust deposited on the dust removal net during the forward wind mode can be removed by the operation in the reverse wind mode.

When the switching operation from the normal wind mode to the reverse wind mode is being performed and the switching time exceeds the switching operation monitoring time , the ventilation control means determines that an operational abnormality has occurred, and the normal wind mode Since it is configured to execute the return processing, the ventilation means is appropriately switched to the normal wind mode if it can be switched to the normal wind mode. There is no possibility that the headwind mode will continue for a long time as in the configuration in which the engine is stopped, and there is little possibility that the engine temperature will rise significantly.

Therefore, by removing dust adhering and accumulating on the dust removal net during operation in the normal wind mode by operating in the reverse wind mode, a sufficient cooling air flow can be secured even in a dusty work environment, and good engine cooling can be achieved. However, it is possible to avoid a significant increase in the engine temperature due to the operation in the headwind mode.

According to a second characteristic configuration of the present invention, in addition to the first characteristic configuration, the ventilation control unit controls the operation of the ventilation unit so as to switch to the normal mode when the main switch is turned on. It is in the point comprised so that a process may be performed .

According to the second characteristic configuration, the ventilation control means is configured to execute the normal wind mode return process when the main switch is turned on. Even in the state of switching to the reverse wind mode, the ventilation means is switched to the normal wind mode when the main switch is turned on. Therefore, when the engine start operation is performed after the main switch is turned on, the ventilation mode is changed. Since the means has already been switched to the normal wind mode or has been switched to a state close to the normal wind mode, the cooling air is supplied to the engine cooling section immediately after the engine has started without any time delay. Therefore, there is little possibility that the temperature of the engine will rise greatly.

According to a third feature configuration of the present invention, in addition to the first feature configuration or the second feature configuration, the ventilation control unit controls the operation of the ventilation unit so as to switch to the normal wind mode when the engine stops. The return processing is configured to be executed .

According to the third characteristic configuration, the ventilation control means is configured to execute the normal wind mode return processing when the engine is stopped. For example, when the main switch is turned off by the operation of the driver, the engine If the engine stops, or even if the main switch is not turned off, for example, when the engine is emergency stopped to prevent overheating, etc. Therefore, in the subsequent engine start operation, the ventilation means has already been switched to the normal wind mode. In other words, the cooling air is supplied to the engine cooling section immediately after the engine is started, and there is little possibility that the temperature of the engine will increase greatly.

The fourth characteristic configuration of the present invention, in addition to any one of the first feature structure to third characterizing feature, before Symbol ventilation control means, detection information of the operation position detecting means, and the actions that result assembling error based on the calibration information to calibrate the difference between the detection value of the position detection means, configured to operate at the operating position for the headwind when the said switching operation means the favorable wind mode the on and the headwind mode downwind manipulation position when the In addition, when there is no calibration information, the forward operation mode is maintained by operating the switching operation unit to the temporary operation position for forward wind based on the detection information of the operation position detection unit. In the point.

  According to the fourth characteristic configuration, the ventilation control means is based on the detection information and the calibration information of the operation position detection means, when the switching operation means is in the normal wind operation position in the normal wind mode and in the reverse wind operation position in the reverse wind mode. Configured to operate. That is, after the operation position detection means and the switching operation means are assembled, calibration information for calibrating the detection value is prepared, and the switching operation means is based on the detection information and the calibration information of the operation position detection means. It is possible to accurately control the switching operation means by accurately detecting the actual operation position.

  However, for example, when the ventilation control means breaks down and is replaced with a new one during maintenance work, the maintenance work is completed without obtaining the calibration information, and ventilation is performed without calibration information. Operation processing may be performed. Thus, when there is no calibration information, if the operation of the switching operation means is controlled based only on the detection information of the operation position detection means, the switching operation means is appropriately operated to the forward wind operation position and the reverse wind operation position, respectively. Can not be. Therefore, the ventilation control means is configured to operate the switching operation means to the temporary operation position for forward wind based on the detection information of the operation position detection means when the calibration information is not present, to maintain the forward wind mode.

  That is, since the operation position detection means does not have the calibration information, it cannot detect an accurate operation position, but it can detect a rough operation position of the switching operation means. Rather than stopping the execution of control when there is no information, the switching operation means is operated to the forward wind temporary operation position that is determined to be the forward wind mode based on the detection result of the operation position detection means. It is maintained in that position. Since this operation position is roughly a position corresponding to the normal wind mode, maintaining the normal wind mode reduces the possibility of a significant increase in the engine temperature.

  According to a fifth feature configuration of the present invention, in addition to any one of the first feature configuration to the fourth feature configuration, when the ventilation control unit detects a work state, the ventilation operation process is performed, and a non-work state is set. When detected, it is configured so as to perform a normal wind operation process for maintaining the normal wind mode.

  According to the fifth characteristic configuration, when the ventilation control means detects the work state, the ventilation operation processing is performed in which the forward wind mode is executed for the set time for forward wind and then the reverse wind mode is executed for the set time for the reverse wind. When the non-working state is detected, the windy wind operation process is performed in which the windy wind mode is continuously executed. Therefore, in the work state where a large amount of dust is expected to be generated, the dust adhered to the dust removal net by the ventilation in the windy mode Can be removed by blowing off to the outside by the ventilation in the reverse wind mode performed thereafter, and the cooling performance of the engine cooling device can be maintained in a good state. Also, in non-working conditions where dust generation is assumed to be relatively small, continuous ventilation in the forward wind mode is carried out without performing unnecessary ventilation in the reverse wind mode, so that intermittent reverse wind mode can be achieved. A good cooling performance can be obtained by avoiding a decrease in the cooling performance of the engine cooling device due to the ventilation. In this way, by varying the operation processing of the ventilation means performed by the ventilation control means between the working state and the non-working state, it is possible to operate the suitable ventilation means in each state.

  According to a sixth characteristic configuration of the present invention, in addition to the fifth characteristic configuration, the ventilation control means is configured such that, as the work state, the engine rotation speed is equal to or higher than a set rotation speed, and the work clutch is in an engaged state. In that it is configured to detect.

  According to the sixth feature configuration, when the work is performed, the work clutch is engaged with the engine accelerated to increase the engine output so as to be able to cope with the work load. By detecting that the working clutch is in the engaged state, it is accurately recognized that the working clutch is in the working state. Therefore, since it is recognized that it is a working state, the dust adhering to the dust removal net can be removed at an appropriate timing.

  According to a seventh feature configuration of the present invention, in addition to any one of the first feature configuration to the sixth feature configuration, the ventilation means reverses the direction of the ventilation blades with respect to the hub that is rotationally driven in a fixed direction. The cooling fan is configured to switch between the normal wind mode and the reverse wind mode.

  According to the seventh characteristic configuration, the cooling fan provided in the ventilation means is configured to be switched between the normal wind mode and the reverse wind mode by reversing the direction of the ventilation blades with respect to the hub that is rotationally driven in a certain direction. For example, as compared with the case where the ventilation means is configured to switch between the forward wind mode and the reverse wind mode by switching the driving rotation direction of the cooling fan having the ventilation blades of the fixed posture in the hub between the forward rotation direction and the reverse rotation direction, The drive structure of the cooling fan can be simplified. Therefore, since the cooling fan drive structure can be made relatively simple, the ventilation means is small and easy to manufacture at low cost.

Embodiments of an engine cooling control apparatus according to the present invention will be described below with reference to the drawings.
FIG. 1 shows an entire right side of a self-decomposing combine that is an example of a harvesting machine, and FIG. 2 shows an entire plane of the combine. The combine was formed in a frame shape by a square pipe material or the like. Airframe frame 1, a pair of left and right crawler type traveling devices 2 arranged at the lower part of this body frame 1, harvesting the planted culm as it travels, and transporting it toward the left rear while changing its posture to the left-right orientation The cutting and conveying unit 3 connected to the front of the machine frame 1 so as to be swingable up and down, and the cutting and conveying unit 3 in the machine frame 1 so as to receive the harvested cereals from the cutting and conveying unit 3 and perform the threshing / sorting process. The threshing device 4 mounted in the rear part, the grain tank 5 arranged in the right side part of the threshing device 4 in the machine frame 1 so as to store the grain from the threshing device 4, and the cutting in the machine frame 1 It is formed by the driver's section 6 or the like formed on the right side portion of the conveyance section 3.

  The grain tank 5 is provided with a screw-type discharge mechanism 7 for discharging the grain stored therein to the outside of the machine, and is provided with a discharge mechanism 7 erected at the rear portion of the grain tank 5 in the body frame 1. Using the lifting screw 8 as a fulcrum, the working position for storing the grain from the threshing device 4 adjacent to the threshing device 4 and the maintenance position for opening the right side of the threshing device 4 away from the threshing device 4 It is configured to be swingable and displaceable in the left-right direction.

  The boarding operation unit 6 includes a boarding step 9 laid on the right front of the body frame 1, a front panel 10 erected immediately before the boarding step 9 in the body frame 1, and a turning operation equipped on the front panel 10. In addition, the control lever 11 for raising and lowering the cutting and conveying section, the side panel 12 standing on the left side of the boarding step 9 in the body frame 1, the main transmission lever 13 and the auxiliary transmission lever 14 provided on the side panel 12 , And a driver's seat 15 provided behind the boarding step 9.

  As shown in FIGS. 1 to 4, the driver's seat 15 is provided on an upper portion of an engine bonnet 17 that covers a prime mover 16 provided at a location in front of the grain tank 5 in the machine body frame 1. A gap is secured between the grain tank 5 and the engine bonnet 17 to allow the rocking displacement of the grain tank 5 with the lifting screw 8 as a fulcrum. The prime mover 16 includes a water-cooled engine 19 mounted on the body frame 1 in an anti-vibration manner in a lateral orientation in which the output shaft 18 faces left and right, and a radiator as an engine cooling unit erected on the right outer side of the engine 19. 20 and a cooling fan 22 disposed between the engine 19 and the radiator 20 so as to be rotationally driven in a fixed direction by the power from the output shaft 18 transmitted through the belt type transmission mechanism 21. ing.

  The engine bonnet 17 is formed in a hollow structure in which the right side wall 23 includes an air guide path 24, and an intake port 27 in which a dust removal net 26 is stretched on an outer surface 25 of the right side wall 23 is an inner surface 28 of the right side wall 23. In addition, a communication port 29 for the radiator 20 is formed, and clean air from which dust and the like are filtered and removed by the dust removal net 26 by the suction action of the cooling fan 22 is supplied to the radiator 20 and the engine 19 for cooling. It is configured.

  As shown in FIGS. 3 to 6, the belt-type transmission mechanism 21 includes an output pulley 30 mounted on the output shaft 18, and a first input mounted on an input shaft 32 of a generator 31 disposed on the left side of the engine 19. A pulley 33, a second input pulley 36 mounted on a pump shaft 35 of a water pump 34 disposed in the front upper part of the engine 19, a transmission belt 37 laid around each of the pulleys 30, 33, 36, etc. It is constituted by.

  The second input pulley 36 is made of a sheet metal having a central portion 38 bulging outwardly in a cylindrical shape so that the central portion 38 has an internal space that allows the water pump 34 to enter. The bulging end portion is connected to the first rotating body 39 fixed to the projecting end of the pump shaft 35 by four bolts 40, whereby the disc-shaped second input is connected to the pump shaft 35 of the water pump 34. Compared with the case where the pulley 36 is mounted, the pump shaft 35 uses the power from the output shaft 18 as the driving force of the water pump 34 while shortening the arrangement length in the direction along the axis P1 of the pump shaft 35. 35.

  Thus, by driving the water pump 34 with the power from the engine 19 via the belt-type transmission mechanism 21, the coolant is circulated between the coolant jacket (not shown) provided in the engine 19 and the radiator 20. Therefore, the engine cooling efficiency can be improved.

  Then, the combine has a normal wind mode for sucking outside air through the dust removal net 26 and supplying the air to the radiator 20, and the normal wind mode reverses the air flow direction to supply air to the dust removal net. Ventilation means A is provided so as to be switchable to the reverse wind mode. The configuration will be described below.

  As shown in FIGS. 3 to 10, the cooling fan 22 includes a hub 41 that is rotationally driven together with the pump shaft 35 with the axis P1 of the pump shaft 35 as a rotation axis, and a rotation axis P1 around the hub 41. It has seven wind-up blades 42 and the like as ventilation blades that generate wind by integral rotation, and is configured to generate wind by being rotationally driven in a certain direction by power from the engine 19 via the belt-type transmission mechanism 21. Has been.

  The hub 41 is formed in a bowl shape having a recessed space in the center thereof, and seven boss-shaped first support portions 43 are aligned and formed on the outer periphery of the hub 41 at regular intervals in the circumferential direction. In each of the first support portions 43, the support shaft portion 44 of the wind-up blade 42 can be relatively rotated about the corresponding axis P2 set in a direction orthogonal to the rotation axis P1 via the metal bearing 45. It is supported by.

  The recessed space of the hub 41 is provided with a second rotating body 46 that is connected to the first rotating body 39 by the four bolts 40 so as to rotate integrally with the second input pulley 36. At the center of 46, a support shaft 47 having a circular cross-section provided with its axis aligned with the axis P1 of the pump shaft 35 is press-fitted and fitted so as to rotate integrally with the second rotating body 46. The center portion of the hub 41 can be slid relative to the support shaft 47 in the direction along the rotational axis P1 with high fitting accuracy with the tilting due to play being suppressed. Are supported. That is, the support shaft 47 is a sliding guide shaft that allows sliding displacement in the direction along the rotation axis P <b> 1 of the hub 41 with respect to the second rotating body 46.

  Then, an O-ring 49 as a seal member for preventing foreign matter from entering between the center portion of the hub 41 and the support shaft 47 on the outer side of the collar 48 between the center portion of the hub 41 and the support shaft 47. Is inserted.

  At the center of the hub 41, four holes 50 for bolt operation are formed with a predetermined interval in the circumferential direction, and the lid body closes the holes 50 and prevents the O-ring 49 from coming off. 51, and a pair of the hub body 41 and the spring receiver 52 that is bolted to the support shaft 47 together with the lid body 51 to bias the hub 41 toward the second input pulley 36. The compression spring 53 is interposed.

  In the outer peripheral portion of the second rotating body 46, a corresponding one of the four through holes 54 formed in the central portion of the hub 41 at a predetermined interval in the circumferential direction is along the rotational axis P1. The four interlocking shafts 55 that are inserted so as to be relatively slidable in the direction and rotate the hub 41 around the rotational axis P1 in association with the rotation of the second rotating body 46 around the rotational axis P1 are It is equipped with press-fit fitting with a predetermined interval in the circumferential direction.

  Collars 56 are internally fitted in the respective through holes 54, and between the collars 56 and the corresponding interlocking shafts 55, the hub 41 and the second rotating body 46 are spaced apart from the respective rotational axes P <b> 1 in the outer peripheral direction. In order to avoid poor insertion of the interlocking shaft 55 with respect to the through hole 54 due to a manufacturing error between each through hole 54 provided in the shaft and the corresponding interlocking shaft 55, a relatively large gap is formed. An O-ring 57 for preventing foreign matter from entering between the corresponding interlocking shaft 55 and the corresponding interlocking shaft 55 and preventing the generation of noise due to contact between the hub 41 and the interlocking shaft 55 during driving or stopping of driving. It is inserted. These O-rings 57 are prevented from coming off by ring-shaped pressing metal fittings 58 that are screwed to the hub 41.

  A swing arm 59 that swings around the axis P2 as the shaft P2 rotates is fixed to the support shaft portion 44 of each of the wind blades 42. A linkage pin 60 protruding toward the second rotating body 46 is provided at the free end portion that is disengaged from the connection portion with the support shaft portion 44, and the linkage mechanism 61 is provided by the swing arm 59, the linkage pin 60, and the like. Is configured.

  Seven groove portions 62 into which the corresponding linkage pins 60 are engaged are formed on the outer edge portion of the second rotating body 46 at a predetermined interval in the circumferential direction. In order to avoid interference with the nut 63 that fixes the swing arm 59 to the support shaft portion 44 of the blade 42, a recess is formed.

  In other words, the second rotating body 46 is disposed in the recessed space of the hub 41, and the rotation axis P1 is effectively utilized by utilizing the gap between the outer peripheral portion of the hub 41 and the outer peripheral portion of the second rotating body 46 in the recessed space. A linkage mechanism 61 is provided for changing the attitude of the wind-up blades 42 around their axis P2 by the displacement of the hub 41 with respect to the second rotating body 46 in the direction along The cooling fan 22 can be made compact while the posture can be changed around the axis P2.

  In addition, between the 2nd input pulley 36 and the 2nd rotary body 45, the positioning in the direction in alignment with the rotating shaft center P1 of the 2nd input pulley 36, or the removal | extraction to the 2nd input pulley 36 side of each drive shaft 54 is carried out. A spacer 64 for stopping and the like is interposed.

  A support member 66 that supports the shift fork 65 so as to be swingable in the direction along the rotation axis P <b> 1 is bolted to the front portion of the engine 19, and the lower end of the shift fork 65 has a second input pulley 36. A cylindrical moving member 67 that surrounds the central portion 38 is supported and connected through a pair of bolts 68 in a state in which the posture of the shift fork 65 using the bolts 68 as a fulcrum can be changed. In addition, a second support portion 69 formed on the outer peripheral portion of the hub 41 is supported via a radial bearing 70.

  That is, the hub 41 is supported by the support shaft 47 via the collar 48 and the outer periphery thereof is supported by the moving member 67 via the radial bearing 70, and the hub 41 can swing the shift fork 65. Accordingly, it is configured to be integrally displaced together with the moving member 67 in the direction along the rotational axis P1.

  In addition, the second input pulley 36 is supported by supporting the second support portion 69 formed on the outer peripheral portion of the hub 41 via the radial bearing 70 on the moving member 67 that surrounds the center portion 38 of the second input pulley 36. The outer peripheral portion of the hub 41, the moving member 67, and the radial bearing 70 can be arranged in a compact state in which the outer peripheral portion of the hub 41, the radial bearing 70 are overlapped in the direction along the rotation axis P1 of the hub 41.

  Each of the second support portions 69 is formed between the first support portions 43 on the outer peripheral portion of the hub 41 so as to be located on the radially inner side of the hub 41 with respect to the first support portion 43. The moving members 67 and the radial bearings 70 supported by the second support portions 69 link the wind-generating blades 42 supported by the first support portions 43 to the second rotating body 46 in the radial direction of the hub 41. In the direction along the rotation axis P <b> 1 of the hub 41, the hub 41 is arranged so as to overlap with the linkage mechanism 61.

  As a result, compared with the case where the second support portion 69 is formed at the same position as the first support portion 43 in the radial direction of the hub 41, the length and radial direction of the hub 41 in the direction along the rotation axis P1 are increased. Without increasing the length, the cross-sectional area of each first support portion 43 of the hub 41 can be increased, and the support strength of the wind-up blade 42 at each first support portion 43 and the overall strength of the hub 41 can be increased. Can be increased.

  Further, compared to the case where the moving member 67 and the radial bearing 70 are not superposed in the radial direction of the hub 41 with respect to the linkage mechanism 61, the length in the radial direction of the hub 41 can be reduced. Accordingly, the effective wind length of each of the wind blades 42 can be increased without increasing the size of the cooling fan 22 in the radial direction, and high wind performance by the wind blades 42 can be ensured. .

  Furthermore, compared to the case where the moving member 67 and the radial bearing 70 are not superposed in the direction along the rotation axis P1 of the hub 41 with respect to the hub 41, the direction in the direction along the rotation axis P1 of the hub 41 is larger. The length can be reduced, so that it is easy to deploy between the engine 19 and the radiator 20 where it is difficult to secure a large space.

  In addition, the first support portions 43 formed when the second support portions 69 are formed over the entire outer peripheral portion of the hub 41 in a state where the second support portions 69 are positioned radially inward of the hub 41 with respect to the first support portion 43. When supporting the wind-up blade 42, or when the wind-up blade 42 and the second rotating body 46 are linked by the linkage mechanism 61, a decrease in assembling property due to the second support portion 69 becoming an obstacle is avoided. it can.

  On the outer peripheral portion of the hub 41, a ring-shaped presser fitting 71 for supporting and fixing each second support portion 69 on the outer peripheral portion to the radial bearing 70 is screwed.

  As shown in FIGS. 1 to 6, the upper end portion of the shift fork 65 is linked to a sector gear 74 supported on the rear wall 73 of the engine bonnet 17 so as to be swingable on the front and rear axis P3 via a pull wire 72 and the like. The sector gear 74 is meshed with an output gear 76 of an electric motor 75 with a reduction gear disposed on the rear wall 73 of the engine bonnet 17 and capable of switching between forward and reverse.

  When the sector gear 74 is driven to swing rightward around the longitudinal axis P3 by the power from the electric motor 75, the pull wire 72 is pulled and the shift fork 65 is rotated about the rotational axis. By swinging in the direction along P1, the hub 41 together with the moving member 67 is displaced in the right direction of the machine body along the rotational axis P1 with respect to the second rotating body 46 against the bias of the compression spring 53. Due to this displacement, the postures of the wind-up blades 42 are simultaneously changed from the normal wind operation position to the reverse wind operation position. Further, as shown in FIG. 3, a rotary potentiometer as an operation position detecting means for detecting the swing angle of the sector gear 74 around the longitudinal axis P3 as the operation position of each of the wind blades 42 by the electric motor 75. An angle sensor S3 is provided.

  Further, when the sector gear 74 is driven to swing leftward about the front / rear axis P3 by the power from the electric motor 75, the pulling operation by the pull wire 72 is released and the hub 41 is compressed. With the bias of the spring 53, the moving member 67 and the second rotating body 46 are displaced leftward along the rotational axis P1 with respect to the second rotating body 46. By this displacement, the posture of each wind-up blade 42 is changed to the back wind operating position. Will be changed simultaneously to the normal wind operation position.

  That is, the compression spring 53, the shift fork 65, the moving member 67, the pull wire 72, the sector gear 74, the electric motor 75, and the like are used to operate the hub 41 with respect to the second rotating body 46 by the operation of the electric motor 75. An operation mechanism 77 is configured as a switching operation means for displacing in the direction along P <b> 1, and the displacement amount of the hub 41 with respect to the second rotating body 46 by the operation mechanism 77 is operated by the linkage mechanism 61 to operate each of the wind blades 42 with respect to the hub 41. The positions can be changed all at once, and the operation position is detected by the angle sensor S3.

  Then, when each of the wind generator blades 42 is switched to the normal wind operation position, the normal wind mode F in which outside air is sucked into the engine bonnet 17 from each intake port 27 of the engine bonnet 17 in accordance with the rotation around the rotation axis P1. When the wind blades 42 are switched to the headwind operation position, the hot air in the engine bonnet 17 is transferred from the intake ports 27 on the right side wall 23 of the engine bonnet 17 along with the rotation around the rotation axis P1. The reverse wind mode R for discharging outside the machine appears.

  Therefore, the cooling fan 22, the operation mechanism 77, the angle sensor S3, and the like constitute the ventilation means A, and the ventilation means A maintains each of the wind blades 42 at the normal wind operation position in the non-working state. Then, by allowing the air to flow in the normal wind mode F, the outside air taken in from each intake port 27 of the engine bonnet 17 is supplied to the radiator 20 and the engine 19 to cool them. Further, in the working state, the attitude of each wind-up blade 42 is switched from the normal wind operation position to the reverse wind operation position, and the reverse wind operation position is changed until a preset set time for reverse wind (for example, 5 seconds) elapses. The air is maintained and passed in the reverse wind mode R, and the dust adhering to the dust removal net 26 on the right side wall 23 is blown out by the hot air discharged from each intake port 27 of the engine bonnet 17 and removed from the dust removal net 26. When the set time for back wind elapses, the posture of each wind blade 42 is switched from the reverse wind operation position to the forward wind operation position, and the posture of each wind blade 42 is changed to the forward wind operation position until the set time for forward wind elapses. The wind is passed in the normal wind mode F, and thereafter, the reverse wind mode R and the normal wind mode F are switched and displayed based on the timekeeping.

  FIG. 12 is a control block diagram for controlling the electric motor 75 which is an operation actuator in the operation mechanism 77 constituting the ventilation means A. The electric motor 75 is controlled and operated by a control device 78 using a microcomputer as ventilation control means. The control device 78 includes a rotation speed sensor S1 for detecting the rotation speed N of the engine 19 and the cutting and conveying unit 3. A work switch S2 for detecting on / off of a work clutch (not shown) for intermittently transmitting power to the threshing device 4 and the angle sensor S3 are connected to each other, and the electric motor 75 is based on information from these sensors and switches. Is program-controlled. In addition, as shown in FIG. 12, when it is operated to the on position, power is supplied to each electric device mounted on the aircraft, and when it is operated to the off position, power supply to each electric device is stopped and the electric device is operated to the start position. Then, a main switch S4 for starting the engine 19 with an engine starter (not shown) is provided.

  When the main switch S4 is turned on, the control device 78 is configured to execute a normal wind mode return process for controlling the operation of the ventilation means A so as to switch to the normal wind mode. The control device 78 is configured to execute the normal wind mode return process when the engine 19 is stopped. In addition, the control device 78 is configured to execute the normal wind mode return process when an operation abnormality is detected during the switching operation from the normal wind mode to the reverse wind mode. Further, based on the detection information and calibration information of the angle sensor S3, the control device 78 operates the operating mechanism 77 in the ventilation means A in the normal wind operation position in the normal wind mode and in the reverse wind operation position in the reverse wind mode. In addition, when there is no calibration information, the forward mechanism mode is maintained by operating the operation mechanism 77 to the forward wind temporary operation position based on the detection information of the angle sensor S3.

Hereinafter, a specific control operation by the control device 78 will be described.
That is, the control operation of the control device 78 consists of four operation modes M1 to M4, and the ventilation means A switches between the normal wind mode F and the reverse wind mode R based on the control operation in each operation mode performed by the control device 78. .
Specifically, the operation mode M1 is a normal wind holding operation mode M1 in which the wind fan 42 is maintained in the normal wind operation position without operating the electric motor 75 and the cooling fan 22 is held in the normal wind mode F. The operation mode M2 is a reverse wind output operation mode M2 in which each of the wind blades 42 is switched from the normal wind operation position to the reverse wind operation position by operating the electric motor 75, and the cooling fan 22 is shifted from the normal wind mode F to the reverse wind mode R. The operation mode M3 is a reverse wind holding operation mode M3 for maintaining the cooling fan 22 in the reverse wind mode R while maintaining the posture of the wind-up blade 42 in the reverse wind operation position without operating the electric motor 75. In mode M4, the electric motor 75 is operated to switch each of the wind blades 42 from the reverse wind operation position to the normal wind operation position, and the cooling fan 22 is moved from the reverse wind mode R to the normal wind mode F. A favorable wind power operation mode M4 to. The processing operation in the normal wind output operation mode M4 corresponds to the normal wind mode return process.

  As shown in FIGS. 14 and 15, when the main switch S4 is turned on and the control device 78 is activated, the control device 78 is decremented for each process in the smooth wind keeping operation mode M1 as an initialization process. The value of the forward wind holding counter Cf is cleared to zero, the operation mode is set to the forward wind output operation mode M3, and the value of the forward wind output monitoring counter Cwf that is decremented for each process in the forward wind output mode M4 is changed from the reverse wind operation position to the forward wind operation. The switching operation monitoring time in consideration of the time required for switching to the position is set to 3 seconds, for example. That is, since the operation mode is set to the normal wind output operation mode M3 as the main switch S4 is turned on, the normal wind mode return process for controlling the operation of the ventilation means A so as to switch to the normal wind mode is executed. become.

  After the initialization process described above, the control device 78 enters the main routine and executes the processing in the main routine every operation cycle Tc. The operation cycle Tc of the control device 78 can be arbitrarily set by a clock signal generated by an external clock (not shown). However, considering the control target of the control device 78, the operation cycle is preferably about several milliseconds or less.

  As described above, since the operation mode of the control device 78 is set to the smooth wind output operation mode M3 by the initialization process, the operation mode of the control device 78 at the start of the main routine performed first after the start of the control device 78 is Although the forward wind output operation mode M3 is executed, the operation mode is changed by any one of the routes shown in FIG. 13 by executing the subsequent processing. According to FIG. 13, when changing from the normal wind holding operation mode M1 to the reverse wind holding operation mode M3, it changes via the reverse wind output operation mode M2, and conversely, changing from the reverse wind holding operation mode M3 to the normal wind holding operation mode M1. It can be seen that changes through the normal wind output operation mode M4. In the figure, a change in the operation mode indicated by a solid line indicates a change in the operation mode that occurs during normal operation, and a change in the operation mode indicated by a broken line indicates a change in the operation mode that occurs during an abnormal operation described later.

  In the main routine shown in FIGS. 14 and 15, first, it is determined whether the output of the angle sensor S3 is normal or abnormal based on whether or not the output signal voltage of the angle sensor S3 is within the normal voltage range (step # 1). The initial adjustment of the angle sensor S3 that causes the control device 78 to learn the output value of the angle sensor S3 at the mechanical swing limit around the longitudinal axis P3 of the sector gear 74 is completed, and the nonvolatile memory or the like is not shown. It is determined whether calibration information is stored in the storage device (step # 2).

  The calibration information will be described. When the operation mechanism 77 including the electric motor 75 and the angle sensor S3 are assembled to the combine, the sector gear 74 is operated to the mechanical swing limit around the front and rear axis P3. The detected value of the angle sensor S3 is represented by a voltage value in the range of 0 to 5V, for example, but individual differences occur due to assembly errors, so that after the assembly, the sector gear 74 is moved around the longitudinal axis P3. The actual detection value when operating up to the mechanical swing limit is measured and stored in a storage device such as a non-volatile memory. When the electric motor 75 is actually controlled, this calibration information is used. To control.

  Note that the calibration information is not limited to the voltage value representing the detection value of the angle sensor S3 when the sector gear 74 is operated to the mechanical swing limit around the longitudinal axis P3. The reference value when the sector gear 74 is operated to the mechanical swing limit around the longitudinal axis P3 is set as a constant value (for example, the minimum value is 0.5V and the maximum value is 0.45V). In addition, it is possible to store information on the difference between the detected value after assembly and the reference value as calibration information. In short, the calibration information includes an actual angle sensor when operating up to the swing limit. What is necessary is just what can obtain the information of individual difference of S3, and can obtain | require with various forms.

  In addition, based on the information stored in the storage device, past operation abnormalities (this operation abnormality will be described later) that occurred when the control operation in the forward wind output operation mode M4 and the reverse wind output operation mode M2 is executed. The presence or absence is discriminated (step # 3).

  Next, based on the value of the rotational speed sensor S1, it is determined whether or not the engine 19 is in a rotating state based on whether or not the rotational speed N of the engine 19 is equal to or higher than the set rotational speed n (step # 4). Based on the state of S2, it is determined whether or not the work clutch is engaged (step # 5).

  When any of the conditions in the discrimination processing from Step # 1 to Step # 5 is not satisfied, the control device 78 detects that the combine is in the non-working state, and the processing is performed when it is detected that the combine is in the working state. Steps # 6 to # 8 are not processed, and the process proceeds to Step # 9.

  If the condition in the determination process in step # 4 is not satisfied, that is, if it is determined that the engine 19 is not in the rotating state, the control device 78 in step # 14, step # 4 performed in the previous process. When it is determined that the engine 19 has changed from the rotation state to the non-rotation state based on the previous determination result information with reference to the determination result information in the previous process stored in the storage device in the determination process at Is set to the normal wind output operation mode M4, and the value of the normal wind output monitoring counter Cwf is set to the normal wind monitoring setting time (for example, 3 seconds) (step # 15), and then the process proceeds to step # 9. As a result, the engine 19 detects an abnormal state such as, for example, occurrence of clogging of the waste straw in the cereal conveying path in the threshing device or detection of the engine water temperature rising above a set value. When the engine 19 is forcibly stopped or when the engine 19 is stopped by turning off the main switch S4, the ventilation means A is set in the normal wind mode regardless of the operating state of the ventilation means A at that time. F. Therefore, when the engine 19 is stopped, the normal wind mode return process is executed.

  If all the conditions in the discrimination processing from Step # 1 to Step # 5 are satisfied, the control device 78 has detected that the combine is in the working state, and Steps # 6, # 7, and # 8 are processed. .

In step # 6, it is determined whether or not the value of the smooth wind keeping counter Cf is zero. If it is zero, the process proceeds to step # 7, and if not zero, the process proceeds to step # 9. By doing so, the working clutch is turned on while the operation mode is the normal wind holding operation mode M1 and the value of the normal wind holding counter Cf is decremented every time the normal wind holding process M1 described later is executed. Even so, the process proceeds to step # 9 without changing the operation mode.

  In step # 7, if the operation mode at the time of processing is the normal wind holding operation mode M1, the process proceeds to step # 8, and if the operation mode at the time of processing is not the normal wind holding operation mode M1, the process proceeds to step # 9. By doing this, even if the value of the wind keeping counter Cf is already zero, if the operation mode is other than the wind keeping operation mode M1, the operation mode is not changed and the process proceeds to step # 9.

  In Step # 8, the operation mode is set to the back wind output operation mode M2, and the value of the back wind output monitoring counter Cwr that is decremented for each process in the back wind output operation mode M2 is switched from the normal wind operation position to the reverse wind operation position. Is set to the switching operation monitoring time (for example, 3 seconds) in consideration of the time required for the operation, and then the process proceeds to step # 9. As described above, when the conditions in the two discrimination processes of Step # 6 and Step # 7 are satisfied, by executing Step # 8, the change to the head wind output operation mode M2 (mode change MC12 in FIG. 13) is smooth. The control operation in the holding operation mode M1 is performed only by detecting the switching to the working state after executing until the value of the smooth wind holding counter Cf is decremented to zero. That is, even if the control device 78 detects the switching to the work state, the execution of the new head wind mode is restrained until the set time for the head wind prohibition elapses after the previous head ventilation in the head wind mode is performed. Will be.

  The process after step # 9 is the same whether the switching from the non-working state to the working state is detected or the switching from the working state to the non-working state is detected. That is, in step # 9, based on the information stored in the storage device, it is determined whether or not there is a past operation abnormality that has occurred while executing the control operation in the head wind output operation mode M2, and it is determined that there is an abnormality. If so, the process proceeds to step # 12.

If it is determined in step # 9 that there is no abnormality, the process proceeds to step # 10. If the operation mode is the head wind output operation mode M2, the head wind output processing Z2 is executed, and the operation mode must be the head wind output operation mode M2. If so, the process proceeds to step # 11. In step # 11, the operation mode is determined. If the operation mode is the reverse wind holding operation mode M3, the reverse wind holding process Z3 is executed. If the operation mode is not the reverse wind holding operation mode M3, the process proceeds to step # 12.

  In step # 12, based on the information stored in the storage device, it is determined whether there is a past operation abnormality that has occurred while executing the control operation in the smooth wind output operation mode M4. The process proceeds to step # 13, and if it is determined that there is an abnormality, the process proceeds to the top of the main routine.

  In step # 13, the operation mode is determined. If the operation mode is the normal wind output operation mode M4, the normal wind output process Z4 is executed. If the operation mode is not the normal wind output operation mode M4, the operation mode is always the normal wind. In the holding operation mode M1, the smooth wind holding process Z1 is executed.

  Thus, the processing corresponding to each operation mode is distributed by the processing after step # 9. Each process of Z1-Z4 which the control apparatus 78 performs by these four operation modes M1-M4 is demonstrated based on FIGS.

  As shown in FIG. 16, in the forward wind holding process Z1, it is determined whether or not the value of the forward wind holding counter Cf is a positive value (step # 1). If the value is positive, the value of the forward wind holding counter Cf is decremented. However, if it is not a positive value, that is, if it has been decremented to zero, no processing is performed, the value of the smooth wind holding counter Cf is maintained at zero, and the normal wind holding operation is performed. The mode M1 is maintained (MC11 in FIG. 13).

  As shown in FIG. 17, in the reverse wind output process Z <b> 2, the operation position of the operation mechanism 77, that is, the current operation position of each blast blade 42 of the cooling fan 22 by the electric motor 75 is determined based on the output value of the angle sensor S <b> 3. It is determined whether or not the target position has been reached, in other words, whether or not the attitude switching from the normal wind operation position to the reverse wind operation position of each wind-up blade 42 has been completed and the ventilation means A has been switched from the normal wind mode F to the reverse wind mode R. (Step # 1) If the target position has not been reached, the process proceeds to Step # 2, and if the target position has been reached, the process proceeds to Step # 5. In step # 2, if the value of the back wind output monitoring counter Cwr is positive, the process proceeds to step # 4 via step # 3, and if not positive, the process proceeds to step # 7 via step # 6.

  In step # 5, since it is considered that the attitude switching from the normal wind operation position to the reverse wind operation position of each of the wind blades 42 has been normally completed, the operation mode is changed from the current reverse wind output operation mode M2 to the reverse wind holding operation mode M3. In order to achieve (mode change MC23 in FIG. 13), the operation mode is set to the back wind holding operation mode M3, and the value of the back wind holding counter Cr is set to a predetermined set time (for example, 5 seconds).

  In step # 6, the set time set in step # 8 of FIG. 14 is exceeded as the initial value of the counterwind output monitoring counter Cwr as the switching operation monitoring time considering the time required for switching from the normal wind operation position to the reverse wind operation position. However, if the target position has not been reached, it is considered that some sort of abnormal operation has occurred during the control operation in the reverse wind output operation mode M2, and therefore the reverse wind output abnormality record is stored in the storage device. In order to change the operation mode from the current reverse wind output operation mode M2 to the forward wind output operation mode M4 (mode change MC24 in FIG. 13), the operation mode is set to the forward wind output operation mode M4 in step # 7, and the forward wind output monitoring is performed. Switching operation monitoring time in consideration of the time required for switching the value of the counter Cwf from the headwind operation position to the headwind operation position (for example, Is set to seconds). Accordingly, when an operation abnormality is detected while the switching operation from the normal wind mode to the reverse wind mode is being executed, the normal wind mode return process is executed.

  In step # 3, it is considered that the attitude switching from the forward wind operation position to the reverse wind operation position of each wind-up blade 42 has not yet been completed, so the operation mode maintains the current wind operation mode, the reverse wind output operation mode M2. MC22 in FIG. 13), the electric motor 75 is reversely driven, and the value of the reverse wind output monitoring counter Cwr is decremented in step # 4.

  As shown in FIG. 18, in the reverse wind holding process Z3, it is determined whether or not the value of the reverse wind holding counter Cr is a positive value (step # 1). If the value is positive, the value of the reverse wind holding counter Cr is decremented. (Step # 2), and the operation mode is maintained in the reverse wind holding operation mode M3 which is the current operation mode (MC33 in FIG. 13). If the value of the reverse wind holding counter Cr is not a positive value, that is, if it is decremented to zero, the operation mode is changed from the current reverse wind holding operation mode M3 to the normal wind output operation mode M4 (mode change MC34 in FIG. 13). Therefore, in step # 3, the operating mode is set to the normal wind output operating mode M4, and the value of the normal wind output monitoring counter Cwf decremented every time in the normal wind output operating mode M4 is changed from the normal wind operating position to the reverse wind operating position. The switching operation monitoring time (for example, 3 seconds) is set in consideration of the time required for switching to. By doing in this way, when the reverse wind holding counter Cr becomes zero, that is, when the ventilation control means of the present invention executes the reverse wind mode for the set time for the reverse wind, the operation mode is the normal wind output operation mode M4. Therefore, the ventilation means A is switched from the reverse wind operation position to the normal wind operation position. The process of step # 3 is the same process as step # 7 in the normal wind output process Z2 shown in FIG.

  As shown in FIG. 19, in the normal wind output process Z4, in step # 1, it is determined whether or not the initial adjustment of the angle sensor S3 is completed and the calibration information as described above is stored in the storage device. Different values are used as the target position when determining whether or not the current operation position of each wind-up blade 42 has reached the target position depending on whether or not the initial adjustment of S3 has been completed. Branch processing is performed so that

  If the initial adjustment of the angle sensor S3 has been completed, the process proceeds to step # 2, and the current operation position of each of the wind-up blades 42 of the cooling fan 22 by the electric motor 75 is determined based on the output value of the angle sensor S3. It is determined whether or not the target position has been reached, that is, whether or not the switching of the attitude of the cooling fan 22 to the forward wind operating position of each of the wing blades 42 has been completed and the cooling fan 22 has been switched to the forward wind mode F. If not, the process proceeds to step # 3. If the target position has been reached, the process proceeds to step # 8. If the initial adjustment of the angle sensor S3 has not been completed, the process proceeds to step # 6, and the current operation position of each of the wind-up blades 42 of the cooling fan 22 by the electric motor 75 is based on the output value of the angle sensor S3. Whether or not the temporary operating position (hereinafter referred to as the temporary target position) has been reached, that is, the attitude switching of the cooling fan 22 to the attitude close to the normal operating position of each of the wind-up blades 42 is completed, and the cooling fan 22 is temporarily in the normal wind mode. It is determined whether or not it has been switched to F. If the temporary target position has not been reached, the process proceeds to step # 3, and if the target position has been reached, the process proceeds to step # 8.

  In both cases where the initial adjustment of the angle sensor S3 has been completed and the initial adjustment of the angle sensor S3 has not been completed, in step # 3, if the value of the forward wind output monitoring counter Cwf is positive, step # 3 Step 4 goes to Step # 5, and if not positive, Step # 7 goes to Step # 8.

  In step # 7, the initialization process of the main routine in FIG. 14 or the step # in FIG. 18 is performed as the initial value of the back wind output monitoring counter Cwf as the switching operation monitoring time considering the time required for switching from the back wind operation position to the forward wind operation position. Since the set time set in 3 has been exceeded and it is considered that some sort of abnormal operation has occurred during the control operation in the normal wind output operation mode M4, the normal wind output abnormality record is stored in the storage device, and the process proceeds to step # 8. .

  In step # 8, if the process proceeds from step # 7, it is considered that some abnormal operation has occurred during the control operation in the normal wind output operation mode M4. Therefore, the operation mode is maintained from the current normal wind output operation mode M4 to maintain the normal wind. In order to change to the operation mode M1 (mode change MC41b in FIG. 13), the operation mode is set to the normal wind holding operation mode M1. Since it is considered that the posture switching to the posture close to the operation position has been normally completed, the operation mode is changed to change the operation mode from the current normal wind output operation mode M4 to the normal wind holding operation mode M1 (mode change MC41a in FIG. 13). The normal wind holding operation mode M1 is set, and the value of the normal wind holding counter Cf is set to a predetermined set time (for example, 3 minutes). Therefore, after passing through step # 8, the ventilation means A is maintained in the normal wind mode, and the control device 78 does not have the initial adjustment of the angle sensor S3 and has no calibration information. Based on the detection information of the angle sensor S3, the operation mechanism 77 is operated to the forward wind temporary operation position to maintain the forward wind mode F.

  In other words, even if the calibration information is not stored and the initial adjustment of the angle sensor S3 is not completed, the current operation of each of the wind-up blades 42 of the cooling fan 22 is performed by the angle sensor S3. Since the rough position can be detected, the position is determined to be almost the normal wind operation position or the position where it is determined that each of the wind-up blades 42 of the cooling fan 22 is in the normal wind operation position based on the detection result of the angle sensor S3. Since it can be estimated that the position is close to that, it is maintained at the temporary target position.

  In step # 4, it is considered that the attitude switching of the wind turbine blades 42 to the normal wind operation position or the attitude close to the normal wind operation position has not yet been completed, and therefore the operation mode is the current wind operation mode, the normal wind output operation mode M4. (MC44 in FIG. 13), the electric motor 75 is driven to rotate forward, and the value of the forward wind output monitoring counter Cwf is decremented in step # 5.

  Since the initial adjustment of the angle sensor S3 as described above, that is, the storage process of the calibration information, is normally performed at the factory at the time of manufacture, the control device 78 immediately after the activation performs step # 2 of FIG. In most cases, the determination process at step # 1 in the process Z4 determines that the adjustment has been completed. However, for example, when the control device 78 is replaced with a new one together with the storage device due to a failure, the angle sensor S3 There is a possibility that the combine is used when the initial adjustment is not completed. When the initial adjustment of the angle sensor S3 is not completed and the control device 78 is started without calibration information being stored, in some cases, the forward wind operating position and the back wind of each of the blast blades 42 of the cooling fan 22 may be detected. The posture switching between the operation positions cannot be performed correctly, and the normal wind mode F and the reverse wind mode R of the cooling fan 22 may not appear correctly.

  Therefore, when the initial adjustment of the angle sensor S3 has not been completed, the control device 78 does not switch the wind-up blades 42 of the cooling fan 22 to the reverse wind operation position, but reliably maintains the posture close to the forward wind operation position. Control to do. Since the initial adjustment of the angle sensor S3 has not been completed, the posture of each of the wind blades 42 of the cooling fan 22 cannot be correctly grasped based on the output of the angle sensor S3. In # 6, by setting the target position of each blast blade 42 of the cooling fan 22 to the target value for non-adjustment, it is close to the original normal wind operation position considering the detection error assumed at the time of non-adjustment The wing blades 42 of the cooling fan 22 are held in a safe posture.

If it is determined in step # 2 of FIG. 14 that the calibration information is not stored and the initial adjustment of the angle sensor S3 is not completed, the process proceeds to step # 9 as described above. Since the operation mode is set to the normal wind output operation mode M3 in the initialization process when the control device 78 is activated, the operation mode when the process first proceeds to step # 9 after the activation is the normal wind output operation set in the initialization process. Mode M4. When the control operation in the previously described normal wind output operation mode M4 is completed, the operation mode changes to the normal wind holding operation mode M1. When the initial adjustment of the angle sensor S3 is not completed during the control operation in the normal wind holding operation mode M1, the main routine of FIGS. 14 and 15 shifts to the step # 9 from the head in the main routine. In step # 8 or step # 5, the process involving the change in the operation mode is not executed, and the process involving the change in the operation mode is not executed even in the smooth wind maintaining process Z1, so the control device 78 continues the control operation thereafter. However, the operation mode is maintained in the normal wind maintenance operation mode M1. That is, when the initial adjustment of the angle sensor S3 is not completed, the control device 78 undergoes the control operation in the normal wind output operation mode M4 immediately after the activation, and thereafter operates only in the normal wind holding operation mode M1. Become. By doing in this way , when the initial adjustment of the angle sensor S3 is not completed, the cooling fan 22 performs ventilation in the normal wind mode F in a posture where the posture of each of the wind blades 42 is safe. .

[Another embodiment]
Hereinafter, other embodiments are listed.

(1) In the above embodiment, the ventilation control means is configured to execute the normal wind mode return process when the main switch is turned on, and to execute the normal wind mode return process when the engine stops. When the operation abnormality is detected during the switching operation from the normal wind mode to the reverse wind mode, the normal wind mode return process is executed, and the operation position detecting means In the case where there is no calibration information, the switching operation means is operated to the forward wind temporary operation position based on the detection information of the operation position detection means, and the forward wind mode is illustrated as an example. Instead of such a configuration, the following configuration may be used.

For example, it is also possible to determine whether or not to execute the normal wind mode return processing by determining only that an abnormal operation is detected when performing the switching operation from the normal wind mode to the reverse wind mode. Good. In addition to this, it is determined whether only one of the two conditions of turning on the main switch and stopping the engine is performed, and whether or not the smooth wind mode return process is executed. It is good also as a structure which discriminate | determines. In addition to these, when there is no calibration information, a configuration is adopted in which the forward operation mode is maintained by operating the switching operation device to the temporary operation position for forward wind based on the detection information of the operation position detection device. Alternatively, it may not be adopted.

In addition, it is possible to determine three conditions: the main switch is turned on, the engine is stopped, and an abnormal operation is detected when switching from the normal wind mode to the reverse wind mode. And it is good also as a structure which discriminate | determines whether the said normal wind mode return process is performed.

Furthermore, it is determined whether or not the normal wind mode return process is executed by determining only that an abnormal operation is detected when the switching operation from the normal wind mode to the reverse wind mode is being executed. In addition, when there is no calibration information, the forward operation mode may be maintained by operating the switching operation device to the forward operation temporary operation position based on the detection information of the operation position detection device.

(2) In the above embodiment, as the ventilation means A that changes the ventilation direction between the normal wind mode and the reverse wind mode, the cooling fan having a structure in which the direction of the blade is reversed with respect to the hub that is rotationally driven in a certain direction is used. Instead of such a configuration, it is also possible to use a configuration in which the forward rotation mode and the reverse wind mode are displayed by switching the driving rotation direction of the cooling fan in which the posture of the blade is fixed to normal and reverse.

(3) In the above embodiment, as the ventilation means A that changes the ventilation direction between the normal wind mode and the reverse wind mode, the single cooling fan is switched between the normal flow state and the reverse flow state. A dedicated cooling fan and a cooling fan dedicated to dust removal that provides a headwind mode can be provided, and these can be used separately.

(4) In the above embodiment, the case where a water-cooled engine is used as an engine has been exemplified. However, the present invention can also be applied to a small harvester equipped with an air-cooled engine. It is supplied directly around the cylinder of the engine as a cooling unit.

(5) In the above embodiment, the cooling fan is driven by the power of the engine. However, the radiator can be cooled by a cooling fan driven by an electric motor. As the ventilation means A that changes the ventilation direction to the reverse wind mode, the rotation direction of the cooling fan can be switched by forward / reverse control of the electric motor.

Overall side view of self-removing combine Overall plan view of self-decomposing combine Partial vertical section rear view of the prime mover Longitudinal side view of the prime mover Longitudinal rear view of the main part showing the configuration of the cooling fan Partial longitudinal rear view of the main part showing the normal wind occurrence state F and the reverse wind occurrence state R Plan view of the main part showing the normal wind occurrence posture and the reverse wind occurrence posture of the wind blade Longitudinal side view of the main part showing the configuration of the cooling fan Longitudinal side view of the main part showing the configuration of the operating mechanism Enlarged vertical side view showing the structure of the center of the cooling fan A longitudinal side view of a main part showing a configuration in which a compression spring for biasing a hub is interposed between a support member and a shift fork. Control block diagram The figure which shows the change of the operation mode for every operation cycle of a control apparatus Flow chart of control program executed by control device Flow chart of control program executed by control device Flow chart of smooth wind maintenance processing executed by control device Flow chart of back wind output processing executed by control device Flowchart of headwind holding process executed by control device Flow chart of smooth wind output processing executed by control device

Explanation of symbols

DESCRIPTION OF SYMBOLS 19 Engine 20 Engine cooling part 22 Cooling fan 26 Dust removal net 41 Hub 42 Blade 77 Switching operation means 78 Ventilation control means A Aeration means F Forward wind mode R Backwind mode S3 Operation position detection means S4 Main switch

Claims (7)

A normal wind mode for sucking outside air through the dust removal net and supplying it to the engine cooling section, and a reverse wind mode for supplying air to the dust removal net with the air flow direction reversed. A ventilation means configured to be switchable;
Ventilation control means is provided for controlling the operation of the ventilation means so as to perform a ventilation operation process that repeats execution of the normal wind mode for the set time for normal wind and then execution of the reverse wind mode for the set time for reverse wind. A control device for cooling the engine,
The ventilation means comprises a switching operation means for performing a switching operation between the normal wind mode and the reverse wind mode, and an operation position detection means for detecting an operation position of the switching operation means,
The ventilation control means when the said downwind mode running switching operation to the headwind mode, the measured switching time to the headwind mode from the favorable wind mode, and the detection of the operation position detecting means Based on the measurement and monitoring, the switching time is changed from the normal wind operation position for the normal wind mode to the reverse wind mode operation position for the reverse wind mode. When it is detected that the switching operation means has not reached the backwind operation position even though the switching operation monitoring time set for the time necessary for switching has been exceeded, the normal wind mode is started. it is determined that the abnormal operation switching Sakuchu to the headwind mode occurs, the real and fair wind mode return processing for controlling the operation of the ventilation means so as to return to the favorable wind mode Configured controller for engine cooling to.   2. The engine according to claim 1, wherein the ventilation control unit is configured to execute a normal wind mode return process for controlling an operation of the ventilation unit so as to switch to the normal wind mode when a main switch is turned on. Control device for cooling.   3. The engine cooling apparatus according to claim 1, wherein the ventilation control unit is configured to execute a normal wind mode return process for controlling an operation of the ventilation unit so as to switch to the normal wind mode when the engine stops. 4. Control device. Before Symbol ventilation control means,
Detection information of the operation position detecting means, and, assembled on the basis of the calibration information to calibrate the difference between the detected value of the operating position detecting means for generating by an error, the operating position for the downwind when the said switching operation means the favorable wind mode It is configured to operate at the operating position for the headwind when the and of the headwind mode, and,
2. The forward wind mode is maintained by operating the switching operation means to a forward wind temporary operation position based on detection information of the operation position detection means when there is no calibration information. 4. The engine cooling control device according to any one of items 3 to 3.   The said ventilation control means is comprised so that the normal wind operation process which maintains the said normal wind mode may be performed if the said ventilation operation process is performed when a working state is detected, and the non-working state is detected. The engine cooling control device according to any one of the above.   The engine cooling device according to claim 5, wherein the ventilation control unit is configured to detect that the engine rotation speed is equal to or higher than a set rotation speed and the work clutch is engaged as the work state. Control device.   The said ventilation | gas_flowing means is comprised with the cooling fan switched to the said normal wind mode and the said reverse wind mode by reversing the direction of a ventilation blade with respect to the hub rotationally driven by a fixed direction. The engine cooling control device according to any one of the above.

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