JP4617274B2 - Working vehicle - Google Patents

Description

  The present invention relates to a work vehicle such as a combine, and more particularly to a work vehicle that uses travel distance data.

2. Description of the Related Art In recent years, work vehicles such as combines have various automatic control functions in order to improve workability, operability, safety, and the like. For example, in a combine, in order to prevent the overflow of the grain tank, the fir sensor provided in the grain tank detects the fullness of the grain tank, and the fir full stop control that automatically stops the engine in response to the fullness detection is performed. (For example, refer to Patent Document 1). Normally, in this type of full stop control, a full alarm is issued in response to full detection, and the engine is automatically stopped after a predetermined time has elapsed, but since the increase in fir is proportional to the travel distance, Is preferably automatically stopped.
JP 2003-219725 A

  However, in order to obtain travel distance data in a work vehicle, it is necessary to provide an expensive rotation sensor having high durability in a travel power system such as a transmission, which causes a problem of significant cost increase. .

The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems, and includes a main transmission operating tool that performs a traveling main transmission operation, and an operation position of the main transmission operating tool. A main traveling operation position detecting means that stores the relationship between the operation position of the main transmission operating tool and the actual vehicle speed in advance, and during traveling, the main transmission operation position detecting means The vehicle speed is calculated based on the detected operation position of the main transmission operating tool, and the travel distance is integrated based on the calculated vehicle speed. In this way, since the travel distance data having a certain degree of accuracy can be obtained without providing an expensive rotation sensor having high durability in the travel power system such as a transmission, the travel distance data is obtained in the work vehicle. When used, a significant increase in cost can be avoided. In particular, when the existing main shift operation position detecting means is used, the travel distance data can be obtained only by changing the program without adding new parts.
And a sub-transmission operation tool for performing a traveling sub-transmission operation; and a sub-transmission operation position detecting means for detecting an operation position of the sub-transmission operation tool. When the operation position of the sub-transmission operation tool is other than the reference position The vehicle speed calculated based on the operation position of the main transmission operating tool is corrected, and the travel distance is integrated based on the corrected vehicle speed. In this way, even when the auxiliary transmission operating tool is operated to a position other than the reference position (for example, the auxiliary transmission operation position for felling material cutting), the calculated vehicle speed error is corrected, and highly accurate travel distance data is obtained. Is obtained.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a combine. The combine 1 includes a pretreatment unit 2 that cuts off the stems, a threshing unit 3 that threshs the grains from the cut stems, and selects them. A grain tank 4 for storing the finished grain, a grain discharge auger 5 for discharging the grain in the grain tank 4 to the outside of the machine, a post-processing unit 6 for post-processing the threshed waste, and a driver's seat 7 and an operation unit 8 provided with various operation tools, and a traveling unit 9 including a pair of left and right crawler traveling devices.

  The operation tool provided in the operation unit 8 includes a main transmission lever (main transmission operation tool) 10 that performs a traveling main transmission operation, a sub transmission lever (sub transmission operation tool) 11 that performs a traveling auxiliary transmission operation, and a work implement clutch. (Threshing clutch) and a harvesting machine clutch lever 12 that is also used as an operating tool for the harvesting clutch, a discharge clutch lever 13 for turning on and off the power of the grain discharge auger 5, and a horn (not shown) ON / OFF And a horn switch 14 to be operated.

The main transmission lever 10 is capable of a stepless traveling main transmission operation over the forward transmission range and the reverse transmission range with a single lever operation, and the operation position is the main transmission lever potentiometer (main transmission operation position detection). Means) 15 is detected.
The auxiliary transmission lever 11 can be operated in three stages. In other words, it is operated to the “standard (reference)” position in normal cutting operations, is operated to the “lodge” position when cutting the lodging material, and is operated to the “high speed” position when traveling on the road. The operation to the “falling” position is detected by the falling down switch 16.
The mowing machine clutch lever 12 can be operated in three positions. In the first position, the work machine clutch and the mowing clutch are disengaged, and in the second position, the working machine clutch is engaged and the mowing clutch is disengaged. In the third position, the work implement clutch and the mowing clutch are engaged. Further, the operation to the position (second or third position) where the work implement clutch is engaged is detected by the work implement clutch switch 17.

  An engine (not shown) is mounted below the driver's seat 7. The power of the engine is branched into a traveling system, a work machine system, and a cutting system, and is transmitted to the traveling unit 9, the threshing unit 3, and the preprocessing unit 2, respectively. The traveling power extracted from the engine is transmitted to the traveling unit 9 through an HST and a transmission (not shown). The HST is a hydrostatic continuously variable transmission mechanism used as a traveling main transmission mechanism, and performs a continuously variable traveling main transmission operation according to the operation of the main transmission lever 10. Further, the transmission includes a traveling sub-transmission mechanism (not shown), and a traveling sub-transmission operation is performed according to the operation of the sub-transmission lever 11.

  The grain tank 4 stores the selected grain that is lifted and conveyed from the threshing unit 3 via the whipping cylinder 18, and the stored grain is driven out of the machine by driving the grain discharge auger 5. Discharged. This discharging operation is preferably performed before the grain tank 4 becomes full, and if this is neglected, overflow may occur. In the combine 1 of this embodiment, in order to prevent the overflow of the grain tank 4, the fir sensor 19 provided in the grain tank 4 detects the fullness of the grain tank 4, and the engine is automatically activated in response to this full detection. Fir full stop control to stop is performed.

  As shown in FIG. 3, the combine 1 is provided with a control unit 20 for performing fir full stop control and the like. The control unit 20 is configured using a microcomputer (including a CPU, ROM, RAM, I / O, etc.), and on its input side, the above-described horn switch 14, main transmission lever potentiometer 15, lodging switch 16, The work implement clutch switch 17, fir sensor 19 and the like are connected, and on the output side, an engine stop solenoid 21 for stopping the engine by fuel cutoff or the like, an electronic buzzer 22 for outputting an electronic alarm sound, and the like are connected. And the control part 20 performs automatic control, such as fir full stop control, based on the program and data which were stored beforehand.

  As shown in FIG. 4, in the fir full stop control, it is first determined whether or not the work implement clutch switch 17 is ON (S1). If this determination result is YES, then the fir sensor 19 is ON. It is determined whether or not (S2). Here, when the fir sensor 19 is OFF, the cutting distance variable and the cutting time variable are cleared and “0” is set to the alarm stop flag (S3). On the other hand, when the fir sensor 19 is ON, the set value of the alarm stop flag is determined (S4). When the set value is “0”, it is determined whether or not the horn switch 14 is ON (S5). . When the horn switch 14 is OFF, the electronic buzzer 22 is intermittently driven to emit an electronic alarm sound (S6). When the horn switch 14 is ON, the alarm stop flag is set to “1”. (S7), the sound of the electronic warning sound is stopped. In other words, in the fir full stop control of the present embodiment, the full alarm can be stopped according to the operation of the horn switch 14 when the full alarm is performed in response to the full detection of the grain tank 4 by the fir sensor 19. Yes.

  When the fir sensor 19 is ON, the vehicle speed is calculated and the cutting distance is integrated regardless of the set value of the alarm stop flag (S8). When the cutting distance after full detection is equal to or greater than a set value (for example, 20 m or more) (S9), the engine stop solenoid is driven to automatically stop the engine (S10). Even if the cutting distance after full detection does not exceed the set value, if the cutting time after full detection exceeds the set value (for example, 60 seconds or more) (S11), the engine is automatically activated. Stop.

The above-described vehicle speed calculation is performed based on the position detection of the main transmission lever 10, not the rotation detection of the traveling system power. That is, the control unit 20 stores in advance the relationship between the operation position of the main transmission lever 10 and the actual vehicle speed, and based on the operation position of the main transmission lever 10 detected by the main transmission lever potentiometer 15 during traveling. The vehicle speed is calculated, and the cutting distance is integrated based on the calculated vehicle speed. For example, as shown in FIG. 5, if the actual vehicle speeds (V ₁ , V ₂ ) corresponding to the operation positions (P ₁ , P ₂ ) of the main transmission lever 10 are stored in advance, these numerical values and the current By substituting the main shift lever potentiometer value P into the following equation, the current vehicle speed V _H (the vehicle speed when the sub shift lever is in the “standard” position) can be calculated as an approximate value. However, it is assumed that the actual vehicle speed (V ₁ , V ₂ ) is measured with the auxiliary transmission lever 11 in the “standard” position.
_{V H = P · (V 2} -V 1) / (P 2 -P 1)
In addition, after calculating the vehicle speed V _H , the travel distance S (= V _H · t) is calculated every predetermined time t, and this is integrated to obtain the cut travel distance after full detection.

Further, when the auxiliary transmission lever 11 is in the “loose” position, the vehicle speed is corrected, and the trimming travel distance is integrated based on the corrected vehicle speed. Specifically, the actual vehicle speeds (V ₃ , V ₄ ) corresponding to the operation positions (P ₁ , P ₂ ) of the main transmission lever 10 are measured in advance with the auxiliary transmission lever 11 in the “depression” position. If this is memorized, by substituting these numerical values and the current main shift lever potentiometer value P into the following equation, the current vehicle speed V _T (the vehicle speed when the sub shift lever 11 is in the “loose” position) ) As an approximate value.
V _T = P · (V ₄ −V ₃ ) / (P ₂ −P ₁ )
Needless to say, the method for obtaining the approximate value of the vehicle speed from the main shift lever potentiometer value is not limited to the above method. For example, the main transmission potential value may be subdivided and the vehicle speed in each segment may be measured and stored as a conversion table.

  According to the present embodiment configured as described above, the combine 1 includes a main transmission lever 10 that performs a traveling main transmission operation and a main transmission lever potentiometer 15 that detects an operation position of the main transmission lever 10. The control unit 20 of the combine 1 stores in advance the relationship between the operation position of the main transmission lever 10 and the actual vehicle speed, and based on the operation position of the main transmission lever 10 detected by the main transmission lever potentiometer 15 during traveling. Since the vehicle speed is calculated and the mileage is integrated based on the calculated vehicle speed, the mileage data having a certain degree of accuracy can be obtained without providing an expensive rotation sensor having high durability in the driving power system such as a transmission. Is obtained. As a result, a significant increase in cost can be avoided when using the travel distance data in the fir full stop control of the combine 1 or the like.

  In addition, a sub-shift lever 11 that performs a travel sub-shift operation and a lodging switch 16 that detects the operation position of the sub-change lever 11 are further provided. When the operation position of the sub-transmission lever 11 is the “falling” position, Since the vehicle speed calculated based on the operation position of the shift lever 10 is corrected and the travel distance is integrated based on the corrected vehicle speed, an error in the calculated vehicle speed caused by the operation position of the sub-shift lever 11 is corrected. In addition, highly accurate travel distance data can be obtained.

  Needless to say, the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the vehicle speed and the travel distance calculated based on the operation position of the main transmission operating tool are set to the fir full stop of the combine. Although used in control, the vehicle speed and travel distance calculated based on the operation position of the main transmission operating tool are not limited to the fir full stop control of the combine, but are used in other work vehicles and various automatic controls. can do.

It is a side view of a combine. It is a top view of a combine. It is a block diagram which shows the input / output of a control part. It is a flowchart which shows the process sequence of fir full stop control. It is explanatory drawing which shows the relationship between a main transmission lever position (sub transmission lever position) and a vehicle speed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combine 4 Grain tank 8 Operation part 9 Traveling part 10 Main speed change lever 11 Sub speed change lever 12 Mowing work machine clutch lever 15 Main speed change lever potentiometer 16 Lodging switch 17 Work equipment clutch switch 19 Fir sensor 20 Control part 21 Engine stop solenoid 22 Electronic buzzer

Claims (2)

A working traveling vehicle comprising: a main transmission operating tool that performs a traveling main transmission operation; and a main transmission operation position detecting means that detects an operation position of the main transmission operating tool
The relationship between the operation position of the main transmission operation tool and the actual vehicle speed is stored in advance, and during traveling, the vehicle speed is calculated based on the operation position of the main transmission operation tool detected by the main transmission operation position detection means, A working vehicle characterized in that the travel distance is integrated based on the calculated vehicle speed.   A sub-shift operating tool for performing a traveling sub-shift operation; and a sub-shift operating position detecting means for detecting an operating position of the sub-shift operating tool. When the operating position of the sub-shift operating tool is other than the reference position, The work vehicle according to claim 1, wherein the vehicle speed calculated based on the operation position of the speed change operation tool is corrected, and the travel distance is integrated based on the corrected vehicle speed.

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