JPH0442995Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a harvester that harvests grain culms and threshes the harvested grain culms, and more specifically, an engine that automatically controls the engine speed. Regarding a control device.

[Prior art]

For harvesters, progress is being made in the development of vehicle speed control devices that detect the threshing load of the handling barrel, etc., and control the vehicle speed based on the detected load to control the amount of grain culm reaped and adjust the threshing load to an appropriate state. In addition, an engine control device that controls the engine speed at the same time as the vehicle speed has also been developed (for example, Japanese Patent Application No. 100877/1982).

[Problems that the invention attempts to solve]

In such an engine control device, it is conceivable to reduce the engine speed at the end of the work to prevent fuel wastage, but if the engine speed is reduced too quickly, the grains in the threshing device will be sorted. There is a risk that the accuracy will deteriorate and cause grain loss.

[Means to solve the problem]

The present invention was made against this background, and includes a detector for grain culms being threshed, an engine speed changer for changing the engine speed, and a detector for grain culms being threshed. an engine speed changer that changes the engine speed; a switch that gives an instruction to the engine speed changer to reduce the engine speed; and when the instruction is given by the switch, the grain culm The present invention is characterized by comprising means for controlling the engine speed changer so as to reduce the engine speed after a predetermined period of time after the grain culm is no longer detected by the detector.

〔Example〕

The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a partially cutaway left side view of a harvester equipped with an engine control device according to the present invention (hereinafter referred to as the device of the present invention). This harvester uses a hydraulic power shift transmission as the main transmission.
It is also equipped with a gear mesh type auxiliary transmission.
In the figure, 1 is a running crawler, and a threshing device 3 is mounted on the upper side of the crawler. A driver's seat 2 and a reaping section 7 are provided on the front side of the threshing device. The reaping section 7 is composed of a grass dividing board 4, a cutting blade 5, a pulling device 6, a vertical conveying device 8, etc., and the grains are separated by the grass dividing board 4 and lifted by the raising device 6. The culm is cut by the cutting blade 5, fed to the threshing device 3 by upper and lower conveying devices (not shown) and the vertical conveying device 8, and is threshed by the handling cylinder 31 of the threshing device 3. The threshing device 3 is installed in front of the threshing device 3 or in the middle of the conveyance route.
A grain culm sensor 14 is provided which detects the conveyance of the grain by coming into contact with the grain culm being fed to the grain culm. The handling cylinder 31 in the threshing device 3 is provided with a handling cylinder sensor 32 that detects the rotation speed of the handling cylinder 31, and this harvester changes the vehicle speed based on the detection result of the handling cylinder sensor 32. It has also become possible to control the vehicle speed so that the rotation speed of the handling cylinder remains constant.

On the side column 9 on the side of the driver's seat 2, there is a main shift lever 10 that changes the speed of the traveling vehicle in the main transmission device.
is installed. The main gear shift lever 10 is rotated by a shift motor 17 (described later) or by manual operation, and is set to the forward 1st gear "F1" to the 4th gear "F4", the neutral gear "N", and the reverse gear "R". Ru. Main gear shift lever 1
A main shift sensor 12 that detects the rotational position of the main shift lever 10 is provided at the base end of the main shift lever 10. Based on the detection result of the main shift sensor 12, the main shift device is set to which drive gear. It is designed to detect whether you are familiar with the situation.

FIG. 2 is a control block diagram of the main parts of the present device. In the figure, reference numeral 20 denotes a control unit, whose input port _a1 is supplied with the output of the handling cylinder sensor 32 that detects the rotation speed of the handling cylinder 31, and its input port _a2 is connected to the main gear shift lever 10. The output of the main shift sensor 12 that detects the set speed stage is given.

The output of an engine sensor 13 that detects the rotational speed of the engine is given to the input port _a3 .

The input port _a4 is given the output of a grain culm sensor 14 that detects the presence or absence of grain culms to be fed to the threshing device 3, and the grain culm sensor 4 turns on when it detects the transportation of grain culms. .

The input port _a5 is supplied with the output of an automatic switch ₁₅ for giving instructions for automatic control of vehicle speed and engine speed based on the handling barrel load. The output of the threshing switch 16, which is turned on when the grain is in the right state, is given.

The output ports b ₁ and b ₂ of the control unit 20 are provided near the base end of the main shift lever 10, and the main shift lever 10 is rotated by the forward and reverse rotation of the main shift lever 10, and the traveling speed stage of the main shift device is changed. The motor 17 is rotated in the forward direction by the high level output of the output port b ₁ , and the main shift lever 10 is rotated to the speed increasing side (“F4” side) (so-called shift up). ), the motor 17 is reversely rotated by the high level output from the output port _b2 , and the main speed change lever 10 is rotated to the deceleration side ("F1" side) (so-called downshift).

Output ports b ₃ and b ₄ each include an accelerator motor 18 that is provided at the base end of an accelerator lever that changes the engine speed, and that rotates the accelerator lever in forward and reverse directions to change the engine speed. The terminals are connected, and the high level output from output port b ₃ rotates the accelerator motor 18 in the forward direction to increase the engine rotation speed, and the high level output from output port b ₄ causes the accelerator motor 18 to rotate in the reverse direction to increase the engine rotation speed. The numbers will drop.

Output ports b ₅ and b ₆ contain information indicating that when the main transmission is in the highest speed gear "F4" or the lowest speed gear "F1", the number of rotations of the handling cylinder is outside the appropriate range and the number of rotations is further increased. A speed increase instruction lamp 21 and a deceleration instruction lamp 22 are connected, respectively, which are turned on to prompt the auxiliary transmission to perform speed increase or deceleration operation when speed or deceleration is required.

An automatic lamp 23 is connected to the output port _b7 , and the automatic lamp 23 is turned on to notify that vehicle speed control and automatic engine speed control are being performed.

[Effect]

The vehicle speed control and automatic engine speed control of the harvester configured as described above will be explained based on the flowchart of FIG. 3. Turn on the key switch, set the threshing clutch to the engaged state (threshing switch 16 on), and turn on the automatic switch 1.
Turn on 5. Then, the control unit 20 starts automatic control, and first sets the engine rotation speed within the optimum rotation speed range (α to β) when the work is being performed. That is, it is determined whether the engine speed is within the appropriate rotation speed range (α to β) during work based on the detected value of the engine sensor 13, and the detected value is below the minimum value α (or the maximum value) of the appropriate range. (value β or more), the control unit 20 sets the output port b ₃ (or b ₄ ) to a high level, continuously drives the accelerator motor 18 in forward (or reverse) rotation, and moves the accelerator lever when the engine speed is higher than the engine speed. Rotate in the direction of increasing (or decreasing) to keep the engine speed within the appropriate range. When the engine speed falls within the appropriate range, the engine speed control flag SF is reset (SF=0).

When work is started in such a state, the grain culm harvested by the reaping section 4 is fed to the threshing device 3, and the grain culm sensor 14 is turned on. When the grain culm sensor 14 is turned on, the control unit 20 drives the accelerator motor 18 in normal rotation for a predetermined period of time to slightly increase the engine rotation speed to a proper rotation state (α to β). This is because if you start work with the engine speed within the appropriate range, the handling cylinder 31 etc. will suddenly be loaded from no load, causing the engine speed to drop and bring the engine speed within the appropriate range again. During this process, there is a risk that the accuracy of the threshing process may deteriorate, leading to loss of grain, etc., so this situation is avoided.

When such control is performed, the engine rotation control flag SF is set (SF=1).

Now, when threshing work is started in a state where the engine speed is slightly higher than the appropriate range during work, the control section 20 performs vehicle speed control based on the handling barrel load. Vehicle speed control determines the handling cylinder load from the detection result of the handling cylinder sensor 32, and determines whether the handling cylinder load becomes larger (or smaller) than the appropriate range and the handling cylinder rotation speed decreases to below (or above) the appropriate range. or increase), the traveling speed stage of the main shift lever 10 is determined from the detected value of the main shift sensor 12, and the main shift lever 1 is
0 is not in the lowest speed drive gear "F1" (or the highest speed drive gear "F4"), the control unit 20 sets the output port b ₄ (or b ₃ ) to a high level and reverses the shift motor 17 ( or normal rotation), and rotates the main gear change lever 10 to the deceleration side (or speed increase side) to shift down (or shift up) to the first gear. Even with this downshift (or upshift),
If the handling barrel load does not fall within the appropriate range, the gear is further downshifted (or upshifted),
In the end, downshift (or upshift) to the lowest speed gear "F1" (or highest speed gear "F4")
be done. When the lowest speed gear "F1" (or the highest speed gear "F4") is selected, if the handling trunk load is larger (or smaller) than the appropriate range, the main transmission Since it is not possible to downshift (or upshift),
The deceleration instruction lamp 22 (or the speed increase instruction lamp 21) is turned on to encourage deceleration (or speed increase) operation of the sub-transmission device. The operator thereby changes the speed of the sub-transmission device and performs the work with the aircraft traveling speed in the appropriate state.

When the handling barrel load is within an appropriate range, the accelerator motor 18 is rotated in the normal direction for a predetermined period of time to slightly increase the engine speed.

When the work is finished and the automatic switch 15 is turned off, if the accelerator motor 18 is being driven, it is stopped, the accelerator motor 18 is not driven, and the automatic lamp 23 is turned off. At the same time, the engine control flag SF is reset (SF=0). Furthermore, the time counter is reset (T=0), and it is checked whether the grain culm sensor 14 is on or not, and the grain culm sensor 14 is in the on state, that is, there is a grain culm to be transported to the threshing device 3. In this case, the engine speed is maintained without reducing the engine speed. Then, when there are no grain culms to be transported and the grain culm sensor 14 turns off, a time counter is operated to start measuring time, and when the content exceeds t representing a predetermined time, that is, the grain culm sensor 14 When a predetermined period of time has elapsed after the accelerator motor 18 is turned off, the accelerator motor 18 is driven in reverse to reduce the engine speed by a predetermined value r below the lower limit of the appropriate engine speed range during work. Therefore, even after the automatic switch 15 is turned off, while the grain culm sensor 14 is on and until a predetermined period of time has elapsed after the grain culm sensor 14 is turned off, the engine speed is not reduced and remains at a predetermined speed. After a period of time, the engine speed is reduced.

〔effect〕

According to the present invention, even if the automatic switch is operated to end the automatic control of the engine speed at the end of the work, the engine speed is not immediately reduced.
Therefore, the engine speed is not reduced while there are grain culms to be transported to the threshing device, and furthermore, the engine speed is reduced after a predetermined period of time has elapsed after the grain culms to be transported are no longer present. Therefore, while grain culms, grains, etc. remain in the threshing device, the engine speed does not decrease, the sorting accuracy does not deteriorate, and grain loss can be prevented.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is a partially cutaway schematic left side view of a harvester equipped with the proposed device, Figure 2 is a block diagram of its control system, and Figure 3 is a schematic diagram of the control system.
The figure is a flowchart for explaining the operation. 3... Threshing device, 7... Reaping section, 10... Main gear shift lever, 12... Main gear shift sensor, 13... Engine sensor, 14... Grain culm sensor, 15... Automatic switch, 16... Threshing switch , 17...shift motor, 18...accelerator motor, 20...control unit, 31...handling cylinder, 32...handling cylinder sensor.

Claims (1)

[Scope of utility model registration request] a detector for grain culms to be threshed; an engine speed changer for changing the engine speed; a switch for giving an instruction to the engine speed changer to reduce the engine speed; When given, the method further comprises means for controlling the engine speed changing machine to reduce the engine speed after a predetermined time from when grain culms are no longer detected by the grain culm detector. The engine control device for the harvester.