JPH047644B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field The present invention relates to a combine harvester equipped with a threshing device that travels around a farm to harvest grain, and particularly relates to an engine control mechanism that controls the rotational speed of the engine included in this combine harvester. .

(b) Summary of the Invention The engine control mechanism for a combine harvester according to the present invention is equipped with a mode change means that changes to manual mode when the current engine speed matches the set engine speed during idling mode, thereby controlling the engine speed. This simplifies the operation when controlling numbers.

(c) Prior art and its disadvantages In general, in a combine harvester, a single engine drives a traveling device for moving the combine harvester through farmland, a threshing device for separating grains and culm waste from the culms, etc. The threshing device rotates a threshing barrel, which has a plurality of threshing teeth on its outer periphery, in a threshing chamber, and separates the transported grain culms into grains and culm waste. The rotation speed of the threshing barrel greatly affects the processing accuracy of the threshing device, and the optimum rotation speed varies depending on the crop variety. Furthermore, the rotation of the engine is normally transmitted to the plow cylinder through a single gear ratio, and the gear ratio cannot be changed. Therefore, in order to change the rotation speed of the pry cylinder, the engine rotation speed must be changed by changing the amount of fuel supplied. moreover,
During idling, when traveling and threshing operations are suspended, the engine rotates at a low speed.
Fuel consumption must be reduced.

The engine speed can be changed as described above by operating the accelerator lever, but this operation is delicate and extremely difficult, and during reaping work, the engine load changes due to changes in running resistance.
Difficult to maintain proper rotation speed. For this purpose, it is possible to select the current state from multiple modes provided depending on the crop variety and the operating state of the combine, and it is equipped with a means to operate the accelerator lever by a signal from the control unit, which is unique to the selected mode. An engine control mechanism has been devised that automatically controls the accelerator position so that the set rotation speed can be achieved.

However, in conventional engine control mechanisms, once a mode is selected, it cannot be changed until another mode is selected. Therefore,
For example, if you want to temporarily suspend the reaping operation and unload the harvested grains from the combine, select idling mode, and then select manual mode again if you manually operate the accelerator to return to the original position. It was impossible. In particular, with small combine harvesters, the amount of grain that can be stored at one time is small, and it may be necessary to unload the grain several times during the harvesting process, which can significantly reduce the efficiency of the harvesting process. There were cases where it decreased.

(d) Purpose of the Invention In view of the above-mentioned conventional drawbacks, the purpose of the present invention is to provide an engine control mechanism for a combine harvester that can simplify the operation when changing from idling mode to manual mode and improve the efficiency of reaping work. It's about doing.

(e) Structure and effect of the invention The engine control mechanism of the combine of this invention is as follows:
After one of the modes is selected by the mode selection means, a determination means is provided for determining whether or not the current rotational speed of the engine matches the set rotational speed, and when the idling mode is selected, the determination means determines whether the two match. The present invention is characterized in that it includes mode changing means for changing to manual mode when necessary.

With the above configuration, according to the present invention, when the idling mode is selected and the engine speed matches the set speed of the idling mode, the mode changing means can automatically change to the manual mode. . Therefore, when you temporarily suspend the reaping operation and unload the stored grains, when you select idling mode and manually operate the accelerator while the idling speed is running,
The operator has already switched to manual mode, and there is no need for the operator to perform any action to set manual mode. Therefore, the engine speed can be easily controlled when returning to the original position of the combine harvester after finishing the work of lowering the grains. Therefore, it is possible to shorten the working time and improve the efficiency of the reaping work.

(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 pass through a conveyance section 38 and are guided into a threshing chamber of a threshing device 34. The solid culms guided to the threshing device 34 are separated into solid grains and culm waste, and only the solid grains are harvested by the grain hopper 37. The combine 31 is also equipped with a pair of left and right crawlers 33. This crawler 33 is rotated by the drive from the engine, and the combine 3
Run 1.

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 pickup 5 is provided facing a flywheel 4 fixed to the crankshaft of an engine 1. This electromagnetic pick-up 5
detects the rotation of the flywheel 4 and outputs the detection 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. This vehicle speed sensor 6 rotates a disk having a slit between a pair of photo interrupters, and outputs an ON signal when it receives light from a light emitting element. This on signal is output to the timer/counter 27. Further, the rotation of the transmission 2 is transmitted to the crawler 33. 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 the output voltage that changes depending on the position of the accelerator 9 is transmitted to the A/D converter 2.
8 is output.

The operation panel drive unit 11 is further connected to the CPU 21 via an I/O interface 24. This operation panel drive section 11 lights up a display device, a warning device, etc. provided in an operation section (not shown), and inputs an ON signal from an operation switch to the CPU 21 via an I/O interface 24.
The operating section is provided with a manual mode switch 12, an idling mode switch 13, a rice mode switch 14, and a wheat mode switch 15. These mode switches 12 to 15 constitute mode selection means. When any one of the mode switches 12 to 15 is operated, the on signal is input from the operation panel drive section 11 to the CPU 21 via the I/O interface 24, and the CPU
21 reads out the set rotation speed for each mode stored in the ROM 22. The set rotation speed read from the ROM 22 is temporarily stored in the memory area M2 of the RAM 23. The selected mode is stored in the memory area M1 of the RAM 23. In addition to the set rotation speed in each mode, the ROM22 also contains CPU2
A program that defines the operation of 1 is stored.

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

When one of the mode switches 12 to 15 provided in the operation section is operated while the engine 1 is started, step n1 (hereinafter referred to as "step ni") is executed.
is simply called “ni”. ). At n1, the type of switch operated is determined, that is, the selected mode is determined. If the manual mode is selected and the manual mode switch 12 is operated, the process returns to the main routine. When the idling mode is selected and the idling mode switch 13 is operated, it is set to n2, and when the barley mode is selected and the barley mode switch 15 is operated, it is set to n3.
When the rice mode is selected and the rice mode switch 14 is operated, the process advances to n4. The selected mode is stored in memory area M1 of RAM23. Based on the contents of this memory area M1
The set rotation speed Rs in each mode is read from the ROM 22 and stored in the memory area M2. In idling mode, n2 stores 1100 rpm as the set rotation speed Rs, when barley mode is selected, n3 stores 3000 rpm, and when rice mode is selected, n4 stores 2900 rpm.

After completing any of the operations from n2 to n4, the process proceeds to n5, where the current rotational speed Ra of the engine 1 is read.
At this time, the timer/counter 27 counts the detection signals of the electromagnetic pickup 5 for a certain period of time,
The rotation speed is calculated using this count value. The calculated current rotation speed Ra is stored in memory area M3. Thereafter, at n7, the current rotation speed Ra stored in the memory area M3 is compared with the set rotation speed Rs stored in the memory area M2. If the two do not match at n7, the process proceeds to n6, where an ON signal is output to the accelerator motor drive relay 26, and the accelerator motor 10 is driven. As a result, the accelerator 9 operates, and the rotational speed of the engine 1 changes together with the amount of fuel supplied by the governor 1a. Thereafter, the current rotation speed Ra and the set rotation speed Rs are compared again at n7, and the operation of n7→n6→n7 is repeated until the two match.

When the current rotation speed Ra matches the set rotation speed Rs at n7, the process proceeds to n8, where the contents of the mode stored in the memory area M1 are read out, and it is determined whether the selected mode is the idling mode. If idling mode is selected, proceed to n9, switch the mode to manual mode, and return to the main routine. If the idling mode is not selected at n8, the process returns directly to the main routine. In the above, n7 corresponds to the determining means of the present invention, and n8 and n9 similarly correspond to the mode changing means.

Through the above-described operations, according to this embodiment, when the idling mode switch 13 is operated and the current rotational speed Ra matches the set rotational speed Rs of the idling mode, the mode is changed to manual mode by the mode changing means, and then the main routine is performed. Return to Therefore,
When the engine reaches an idling state, manual accelerator operation is immediately possible, allowing the operator to change the engine speed to the desired speed. In addition, in the operation of n7→n6→n7, it is impossible to make the current rotation speed Ra strictly match the set rotation speed Rs, and this also causes instability of the operation. Therefore, the set rotation speed Rs is ±10 rpm.
A dead zone is provided within a certain range, and the position of the accelerator 9 is controlled so that the current rotation speed Ra falls within this dead zone.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing part of the operation of a combine harvester equipped with 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. It is. 1...Engine, 12-15...Mode selection switch.

Claims (1)

[Scope of Claims] 1. Accelerator operating means that operates an accelerator to change the amount of fuel supplied to adjust the engine speed, and a plurality of engine speeds including an idling mode and having a specific set speed that is adjusted by the accelerator control means. In the engine control mechanism of a combine, the engine control mechanism for a combine is equipped with a mode selection means that allows selection and input of one mode from a manual mode and a manual mode. This engine control mechanism for a combine harvester is provided with a discriminating means for discriminating whether or not the number of revolutions matches a set rotation speed, and a mode changing means for changing to a manual mode when an idling mode is selected and the two match in the discriminating means.