JPH0437688B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field The present invention relates to a combine that is equipped with a threshing device and that travels in farmland to harvest crops, and more specifically, relates to a combine harvester that is equipped with a threshing device and that travels through farmland to harvest crops, and more specifically, relates to a combine harvester that is equipped with a threshing device and that travels through farmland to reap crops. Regarding the control mechanism.

(b) Summary of the Invention The engine control mechanism for a combine harvester according to the present invention includes means for setting the engine rotational speed to the rotational speed during the reaping operation for a certain period of time after the end of the reaping operation, in order to prevent a decrease in the processing accuracy of the threshing device; When an idling operation is instructed during this period, the device is provided with a means for executing the operation after a certain period of time has elapsed, so that the threshing and sorting of the small culms remaining inside and in front of the threshing device at the end of the reaping operation can be performed normally. It is.

(c) Background of the Invention In general, a threshing device mounted on a combine harvester has a threshing barrel with a plurality of threshing teeth formed on its outer periphery, which is rotatably installed in the threshing chamber, and which collects grains and culm waste from the threshing culm guided inside. Separate. The culms are cut from the plant by a cutting section provided at the front of the combine harvester, and guided into the plowing chamber by a conveyor claw or a conveyor chain. In addition, the reaping section is equipped with a plant sensor that detects planted plants, and detects the presence or absence of small culms to be reaped. When this plant sensor is on, it is assumed that there is a small culm to be harvested and the reaping operation is executed, and when it is turned off, it is assumed that there is no longer any small culm to be reaped and the reaping operation is completed.
At this time, there remains a solid culm that has not been threshed and is being transported between the stock sensor and the threshing device, and a solid culm that is being threshed remains in the threshing chamber.

In this situation, if the operator manually operates the accelerator to lower the engine speed, the threshing process for the solid culms that are being threshed or transported will be incomplete, and the solid grains will be removed from the machine. This results in an increase in losses. Particularly, in a system in which engine speed control can be set by a simple button operation or the like in order to simplify operator operations, erroneous operations are likely to occur and losses occur more frequently. For this reason, there has been a demand for a control mechanism that can prevent the engine rotational speed from changing until the end of the threshing process and the end of the threshing process related to the small culms being transported after the reaping operation is completed.

(d) Purpose of the Invention In view of the above-mentioned background, the purpose of the present invention is to maintain the engine speed at the same speed as during the reaping operation, so that the remaining culms can be properly threshed after the reaping operation is completed. The object of the present invention is to provide an engine control mechanism that maintains the engine in the following state.

(e) Structure and effect of the invention The engine control mechanism of the combine of this invention is as follows:
If the threshing switch is not turned off after the end of the reaping operation, the first engine speed control means maintains the engine speed during the reaping operation for a certain period of time, and if idling operation is instructed during this period, the first engine speed control means maintains the engine speed during the reaping operation for a certain period of time. The present invention is characterized by comprising a second rotation speed control means for executing an idling operation.

According to the present invention with the above configuration, by providing the first rotational speed control means, even after the reaping operation is completed, the engine rotational speed during the reaping operation can be controlled for a certain period of time while the threshing switch is on. The threshing process can be performed normally by maintaining and rotating the threshing barrel under optimal conditions for the remaining culms. In addition, by providing the second rotation speed control means, even if idling operation is instructed due to operator error, idling operation will be resumed after a certain period of time has elapsed until the threshing process for the remaining small culms is completed. Execute. Therefore, it is possible to prevent a decrease in the accuracy of the threshing process due to an operator's malfunction.

(f) Embodiment FIG. 2 is an external view of a combine harvester having an engine control mechanism according to an embodiment of the present invention.

A reaping section 32 is attached to the front end of the combine 31. A divider 35 provided in this reaping section 32 is for dividing the small culms.
The sorted culms are guided into the cutting section 32 by the distributing claws 36, and are cut from the plant by cutting teeth (not shown). The cut culms are transferred to the conveyance section 33
It is guided through the threshing device 34 into the threshing chamber. The stock sensor 37 that detects the presence or absence of dark culms is located in the cutting section 3.
A conveying section 33 is located between the threshing device 34 and the threshing device 34 . Therefore, at the time when the stock sensor 37 no longer detects the thick culm, the thick culm is located inside the threshing device 34 and in the conveying section 33.

FIG. 3 is a block diagram of a control section of a combine harvester having the engine control mechanism described above.

A timer/counter 27, an accelerator motor drive relay 26, and an A/D converter 28 are connected to the CPU 21 via an I/O interface 24. An electromagnetic pick-up 5 is provided opposite to a flywheel 4 fixed to the crankshaft of the engine 1. This electromagnetic pick-up 5
detects the rotation of the flywheel 4 and outputs an output signal to the timer/counter 27. Further, a vehicle speed sensor 6 is provided on the first shaft of the transmission 2 to which the rotation of the crankshaft of the engine 1 is transmitted. The output signal of this vehicle speed sensor 6 is
It is output to the counter 27.

The accelerator motor 10 is connected to the accelerator motor drive relay 26 . The accelerator 9 is attached with the rotation axis of the accelerator motor 10 as a fulcrum. The operation of the accelerator 9 is transmitted to the governor 1a, which is a fuel supply device, via a link 9a. Further, the accelerator 9 is equipped with a potentiometer 9b, and an output voltage corresponding to the position of the accelerator 9 is output to the A/D converter 28.

In addition, the CPU 21 also has a stock sensor 37 on/off.
An off signal is output via the I/O interface 24. Further, on/off signals of switches 13 to 16 provided in the operation section are similarly inputted via the I/O interface 24. These are for setting the rotation speed of the engine. Switch 13 is a switch that is turned on when the crop variety to be harvested is wheat, and switch 14 is operated when the crop to be harvested is rice. Further, switch 15 is a switch for selecting manual mode, and switch 16 is for instructing the engine to perform idling operation.

Rotation of the crankshaft of the engine 1 is transmitted to the plow cylinder 18 by a belt 20. The belt 20 is provided with a detachable member 20a, which allows transmission of rotation to the plow cylinder 18 to be selected. This detachable member 20a is connected to the threshing lever 19 via a link 19a. The operation of the threshing lever 19 is transmitted to the detachable member 19a by a link 19a. When the threshing lever 19 is operated to the threshing side and the threshing switch 17 is turned on, the detachable member 20a operates so that the rotation of the crankshaft is transmitted to the threshing barrel 18. At this time, the ON signal of the threshing switch 17 is
It is input to the CPU 21 via the O interface 24.

A ROM 22 connected to the CPU 21 stores engine speed settings and the like according to the crop variety selected by operating the switch 13 or 14. Further, the ROM 23 temporarily stores input and output data. A timer 29 is further connected to the CPU 21 . Based on the signal from the timer 29, the CPU 21 measures the time until the culm that has passed the position of the stock sensor 37 completes the threshing process. This time is stored in the ROM 22 in advance.

FIG. 1 is a flowchart showing part of the operation of the combine harvester.

After the main key is turned on, data is input by the operator at step n1 (hereinafter "step n" will simply be referred to as "n"). Data input here includes selection of crop varieties using switches 13 and 14, and the like. Once the crop variety has been selected, proceed to n2 and switch 1
Depending on the on signal from either 3 or 14
The set rotation speed Rs is read from the ROM 22.

Next, at n3, the engine 1 is determined by the count value of the timer counter 27 of the electromagnetic pickup 5.
The accelerator 9 is operated so that the rotation speed becomes the set rotation speed Rs. Specifically, a signal from the CPU 21 is input to the accelerator motor drive relay 26 via the I/O interface 24. Voltage is supplied to the accelerator motor 10 in accordance with this signal,
The accelerator 9 rotates. The output voltage of the potentiometer 9b changes due to the operation of the accelerator 9,
This voltage is converted into a digital signal by the A/D converter 28 and sent from the I/O interface 24.
It is input to the CPU 21. The output of the potentiometer 9b corresponding to the set rotational speed Rs of the engine 1 in a no-load state is stored in the ROM 22 in advance, and is the current output value of the potentiometer 9b.
Compare with the value stored in ROM22 and press accelerator 9.
is operated.

Thereafter, when the combine 31 starts running, the rotation speed of the engine 1 decreases due to the load due to road resistance, but the accelerator 9 is operated to maintain the set rotation speed Rs. Stock sensor 37 in n4
When turned on, the process proceeds to n5, where it is determined whether or not the threshing switch 17 is turned on. If threshing switch 17 is turned on at n5, proceed to n6,
Threshing operation is started. As long as the plants are continuously planted and the plant origin sensor 37 is on, the process proceeds from n6 to n7 to n6', and this operation is repeated. Therefore, during the threshing operation, the accelerator 9 is operated to maintain the set number of circuits Rs.

When the stock sensor 37 is turned off at n7, the process proceeds to n8, where it is determined whether or not the threshing switch 17 remains on. If the threshing switch 17 is turned on at n8, the process advances to n9 and the timer 29 starts counting a certain period of time. Further, at n10, the accelerator 9 is operated to maintain the set rotation speed Rs. That is, the engine rotation speed during the reaping operation is maintained. During n10, control of the rotation speed continues until the timer times up at n11, and when the timer times up at n11, the process advances to n12.

At n12, it is determined whether any of the switches 13 to 16 has been turned on. If no switch is operated at n12, the process returns to n1 and waits for data input. If any switch is operated at n12, the process proceeds to n13, where it is determined whether the operated switch is the idling switch 16 or not. If the operated switch is not the idling switch 16, the process advances to n15 and processes are performed according to each switch.
When the idling switch 16 is operated
Proceed to n14, and move the accelerator 9 so that the engine 1 reaches the idling speed, and the operation ends. If the threshing switch 17 is not turned on at n8, it is assumed that no threshing operation has been performed and the process returns to n1.

In the above, n9 to n11 correspond to the first rotation speed control means of the present invention, and n12 to n14 similarly correspond to the second rotation speed control means. Detection of whether an idling operation has been instructed is performed after the timer times up in n11 and a certain period of time has elapsed. Therefore, even if the idling switch 16 is operated immediately after the stock sensor 37 is turned off, the rotation speed will not be set to idling immediately, but will remain at the set rotation speed until the threshing process for the remaining small culms is completed. In order to maintain Rs.3, all harvested culms are threshed accurately and no losses occur.

In this embodiment, the accelerator is always operated to maintain the set rotation speed Rs during the threshing operation. The present invention can be similarly applied to a device in which the accelerator is controlled so that the rotation speed becomes the set rotation speed Rs and the accelerator is not changed during the threshing operation.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the operation of a combine harvester having an engine control mechanism according to an embodiment of the present invention, FIG. 2 is an external view of the combine, and FIG. 3 is a block diagram of the control section of the combine. 16...idling switch, 17...threshing switch, 37...stock sensor.

Claims (1)

[Scope of Claims] 1. A combine harvester that is equipped with a rotation speed control means that changes the engine rotation speed by adjusting an accelerator, and a threshing switch that selects whether or not to transmit the engine rotation to the threshing device. After the work is completed, if the threshing switch is not turned off, the first engine speed control means maintains the engine speed during the reaping work for a certain period of time, and if an idling operation is instructed during this period, the first engine speed control means maintains the engine speed during the reaping operation, and if the idling operation is instructed during this period, the first engine speed control means maintains the engine speed during the reaping operation for a certain period of time. An engine control mechanism for a combine harvester, comprising a second rotation speed control means that later performs an idling operation.