JPH0787833A - Speed control system for farm working vehicle - Google Patents

Abstract

PURPOSE:To provide system designed to increase the speed of a farm working vehicle when the fluctuations of the number of the vehicle engine revolutions near its set value fall within a specified range for a specified time. CONSTITUTION:This system is so designed that the number of engine revolutions for a farm working vehicle is detected and the throttle or speed of the vehicle is controlled so as to keep the revolution at a set value. In this system, vehicle speed is raised when the fluctuations of the number of the vehicle engine revolutions near its set value fall within a specified range for a specified time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed control device for agricultural work vehicles, and can be used for a vehicle speed increasing device which detects a fluctuation range with respect to a set engine speed.

[0002]

2. Description of the Related Art When an agricultural work vehicle is operated, it is automatically controlled so as to keep its output speed constant according to the load condition of the engine. In order to keep the engine speed at a set value when the load fluctuates due to changes in the conditions of the target object or acceleration / deceleration of the vehicle speed, etc., the engine speed detected by an engine speed sensor that detects the engine speed, and the engine speed The throttle opening position detected by the throttle position sensor or the like for detecting the throttle opening position of the vehicle and the HST shift lever position detected by the HST position sensor or the like for detecting the shift of the vehicle speed by the HST device are used as the vehicle speed control device. The calculation is performed by sending it, and the engine speed is adjusted by this calculation according to the fluctuation of the load. When increasing the vehicle speed during these adjustment controls, it is necessary to make settings in advance so as to quickly match the throttle opening with the position of the appropriate fuel supply amount obtained from the governor characteristic curve. In addition, each sensor requires complicated adjustment, and this adjustment requires a lot of trouble and time.

Therefore, according to the present invention, in order to maintain the engine speed at a set value when the vehicle speed is increased, the vehicle speed is increased when the fluctuation range of the engine speed in the vicinity of the set value is within a predetermined region for a certain period of time. To do so.

[0004]

The present invention relates to an agricultural work vehicle in which an engine speed n is detected and the throttle 1 or vehicle speed is controlled so as to maintain the speed n at a set value N.
The vehicle speed control device is configured to increase the vehicle speed when the fluctuation range of the rotation speed n in the vicinity of the set value N is within a predetermined region for a certain period of time.

[0005]

[Operation and Effect of the Invention] When working on an agricultural work vehicle,
For example, an engine speed sensor that detects the engine speed n, and a throttle 1 that controls the engine speed n to be high or low.
Throttle position sensor that detects the opening position of
A vehicle having an HST position sensor that detects an operating position of an HST device that controls a vehicle speed by hydraulic drive and automatically holds the engine speed n at a set value N (for example, a rated speed). When speeding up, it is not by controlling the opening position of the throttle 1 as in the past,
By increasing the vehicle speed when the fluctuation range in the vicinity of the set value N of the engine speed n detected within a preset fixed time is within a predetermined range (for example, ± 50 rpm) and stable. , The set value N can be easily held.

As described above, in the case where the engine speed n is maintained at the set value N when the vehicle speed is increased, as in the conventional case in which the throttle 1 is adjusted and set according to the fluctuation of the load, Since the adjustment is complicated, it does not require much trouble and time, and whether the fluctuation range of the rotation speed n in the vicinity of the set value N is within a predetermined area for a certain time is detected by simply detecting the engine rotation speed n. The vehicle speed can be increased irrespective of the throttle opening position by a simple check, and therefore the adjustment of each sensor can be easily performed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings of a combine as an agricultural work vehicle. A traveling device 4 having a pair of left and right traveling crawlers 3 traveling on the ground is disposed on the lower side of the vehicle chassis 2 of the combine, and the grain stalks sandwiched between the feed chains are threshed on the vehicle chassis 2, and the threshing is performed. A threshing device 6 equipped with a grain tank 5 for sorting and collecting the selected grains and temporarily storing them is placed. In addition, a cutting device 7 for weeding and raising a standing culm to the front side of the threshing device 6 and carrying the cut culm to the rear side and delivering it to the feed chain is moved up and down with respect to the ground. It is mounted on the front end of the chassis 2 so that it can be raised and lowered. Further, an operating device 8 for controlling the operation of the combine and an operating seat 9 for this operation are provided on one side of the threshing device 6, and the machine body 10 of the combine is constituted by these devices 4, 6, 7, 8 and the like. Make up.

At the front end of the chassis 2, there is provided a traveling mission case 11 having a speed change mechanism incorporated therein, and an HST device 12 for changing the speed by hydraulic drive is interlockedly connected to one side of the transmission case 11 so that the operation seat 9 can be operated. An engine 13 that supplies power to each part of the machine body 10 is mounted below. As shown in FIG. 3, a fuel supply device 14 is provided on one side of the engine 13.
And a throttle 1 for adjusting the fuel supply amount of the fuel supply device 14, and a throttle lever 15 for operating and controlling the opening position of the throttle 1 on one side of the operating device 8.
The throttle motor 16 and the throttle motor 16 are connected by a wire, and a throttle position sensor 17 for detecting the opening position of the throttle 1 is provided at an appropriate position. An engine speed sensor 18 for detecting the output speed n of the engine 13 is disposed at an appropriate position of the engine 13, and the HST device 12 is provided on one side of the operating device 8 to control the shift of the vehicle speed.
The ST lever 19 and the HST motor 20 are connected by a wire, and an HST position sensor 21 for detecting the operating position of the HST operating lever 19 is arranged at an appropriate position.

In the vicinity of the operating device 8, as shown in FIG.
A vehicle speed control device 22 for arithmetically controlling the shift of the vehicle speed is provided, and the vehicle speed control device 22 is a CPU 23 for performing central arithmetic control.
Is disposed in the center, and the throttle position sensor 1 is connected to the input side of the CPU 23 via the input interface 24.
7. The engine rotation sensor 18 and the HST position sensor 21 are connected to each other, and the throttle motor 16 and the HST motor 20 are connected to the output side via the output interface 25.

The grain tank 5 is located on the rear side of the chassis 2 on one side of the threshing device 6 and has a lower horizontal screw 26 for laterally feeding the grain installed at the bottom thereof. A grain-removing gear case 28 that takes over the grain to the vertical screw 27 and changes the direction is fixed to one side of the grain tank 5.
A grain auger support tube 29 having the vertical screw 27 installed therein is provided on one side of the grain tank 5 so as to be supported in the grain removal gear case 28 so as to be vertically rotatable about an axis of the support grain axis.

With the upper end of the grain-removing auger support tube 29 as a fulcrum, the entire length thereof extends in the longitudinal direction of the machine body 10,
Grain auger 31 equipped with upper horizontal screw 30 inside
Is connected and interlocked so as to be vertically rotatable, and is configured to be integrally rotatable left and right when the grain auger support tube 29 is horizontally rotated. In addition, a grain discharge port 31a for discharging grains to the outside is provided downward at the tip of the grain discharge auger 31, and the grain discharge port 31a is provided adjacent to and adjacent to the grain discharge port 31a. A distance measuring sensor 32 for detecting the distance by transmitting and receiving ultrasonic waves is arranged.

A driven gear 33 is provided on the outer periphery of the lower end portion of the grain auger support cylinder 29, and a pinion 34 meshing with the driven gear 33 is axially fixed to a turning motor 35 fixed to one side of the grain tank 5. The grain-removing auger support cylinder 29 is provided so as to be rotatable left and right by the forward and reverse rotations of the turning motor 35. In addition, the grain auger 31 is attached to the grain auger support cylinder 29.
A hydraulically driven telescopic cylinder 36 is attached to each arbitrary position so as to be vertically rotatable.

The turning motor 35 and the telescopic cylinder 36 are operated by operating a grain operation lever 37 provided on one side of the operating device 8. The grain operation lever 37 is moved from the neutral position to the left or right or from the neutral position. It is tiltably provided in the front-rear direction, and turns on the left tilt contact L and the right tilt contact R to turn on the left turning relay 38 or the right turning relay 39.
By this action, the turning motor 35 is rotated in the normal or reverse direction. The forward tilting contact D and the rearward tilting contact U are each turned on, and the telescopic cylinder 36 is expanded and contracted by the action of the descending solenoid 40 or the ascending solenoid 41. By operating the turning motor 35 and the telescopic cylinder 36 as described above, the grain auger 31 can be turned to the left and right or vertically with respect to the machine body 10.

As switches for automatic operation, a discharge switch 42 for controlling the turning of the grain auger 31 from the storage position of the machine body 10 to the discharge position of the grain, and a storage switch 43 for controlling the rotation from the discharge position to the storage position. And the grain auger 3
1 is provided with a stop switch 44 for making an emergency stop, and a turning regulation switch 45 and a vertical regulation switch 46 including a potentiometer and the like for positioning the grain auger 31 when turning horizontally or vertically. The discharge switch 42, the storage switch 43, and the stop switch 44 are respectively arranged near the periphery of the operation lever 37, and the turning regulation switch 45 and the vertical regulation switch 46 are arranged at appropriate positions in the operation area. Constitute.

As shown in FIG. 9, the distance measuring sensor 32 and the left tilt contact L, the right tilt contact R, the front tilt contact D, the rear tilt contact U, and the discharge switch 42 of the grain operation lever 37, the storage switch 42, and the storage. The switch 43, stop switch 44, turning restriction switch 45, vertical restriction switch 46, etc.
Grain auger control device 47 that mainly performs arithmetic control of U
To the input side of the left turn relay 3
8, right turn relay 39, and the descending solenoid 4
0 and the rising solenoid 41 are connected to the output side, respectively.

Next, the operation of the above configuration will be described. When the engine 13 is started, power is transmitted to each of the traveling device 4, the threshing device 6, the mowing device 7, etc. By this transmission, the mowing device 7 is brought into sliding contact with the soil surface to mow the napped culm, and the mowed culm Is carried to the threshing device 6 to perform threshing processing. In such combine work, the output speed n of the engine 13 is detected by the engine speed sensor 18, and the engine speed n is calculated by the vehicle speed control device 22. The throttle motor 16 is actuated so as to reach a preset value N (normally the rated speed), and the opening position of the throttle 1 is adjusted and controlled.

At the time of such adjustment, as shown in the flow chart of FIG. 5, the standard deviation of the engine speed n detected within this fixed time is calculated as the fixed time elapses, and this standard deviation is shown in FIG. Set value N (2500-2
When it is within the range of 600 r / min), HS
The T motor 20 is operated to shift the HST device 12 to the speed increasing side.

Further, as a result of the acceleration as described above, FIG.
As shown in the flowchart of FIG. 8 and FIG. 8, when the engine speed n becomes lower than the range of the set value N, the HST motor 20 is operated to shift the HST device 12 to the deceleration side, and thereafter, the deceleration is performed. Work at the maximum vehicle speed. These acceleration and deceleration operations of the HST device 12 can determine whether gear shifting is possible only by checking the engine speed n regardless of the opening position of the throttle 1.
As in the prior art, each sensor 17, which is necessary to determine whether gear shifting is possible, while checking the opening position of the throttle 1,
No need for troublesome adjustments at 21 and the like.

The throttle 1 and the HST device 12
The throttle lever 15 and the HST operating lever 1 respectively.
It is needless to say that the manual operation can be performed by means of 9, and the manual operation can be prioritized during the automatic operation. The grain harvested by the combine work is stored in the grain tank 5, and when the grain tank 5 is full, the vicinity of the grain carrier 48 that suspends the combine work and makes the farm road or the like stand by. The airframe 10 is approached to.

When the discharge switch 42 is first turned on as an automatic operation due to the approach of the machine body 10, the rising solenoid 41 is raised by the rising signal from the grain auger control device 47.
The telescopic cylinder 36 is extended by the action of the
1 is rotated upward from the storage position and stopped by the vertical regulating switch 46. The left or right turning relays 38 and 39 are actuated by the turning signal in the direction set by this ascending stop, the turning motor 35 is rotated, the grain auger 31 is turned, and the turning regulation switch 45 stops it at an appropriate position. . In this way, by turning on the discharge switch 42,
The grain auger 31 is controlled to move upward from the storage position to the discharge position and stops above the grain carrier 48 as shown in FIG.

By the automatic operation, the grain auger 31 stopped above the grain carrier 48 is lowered by operating the grain operation lever 37, and the grain discharge port 3 of the grain auger 31 is lowered.
1a is stopped at an appropriate position for discharging grains on the bed of the grain carrier 48. The proper height of the stopped grain discharge port 31a is detected by the distance measuring sensor 32, and the detected value is sent to and stored in the grain discharge auger control device 47, whereby the discharge switch 42 from the next time onward. ON
The automatic operation as described above is performed by the
It is possible to continuously move to a proper height in the order of ascending → turning → descent without stopping a above the grain transport vehicle 48.

In this way, the distance measuring sensor 32 detects the proper height for lowering the grain-removing auger 31 from above the grain transporting vehicle 48, and it can be automatically lowered from the next time. Therefore, only by turning on the discharge switch 42,
The grain discharge port 31a can be stopped at an appropriate position where grain can be discharged, and the operation of the operator becomes very easy. Moreover, since the height position stopped by the operation of the grain operation lever 37 is stored, the stop height can be freely set.

[Brief description of drawings]

FIG. 1 is a side view showing the entire combine.

FIG. 2 is a side view showing the entire combine.

FIG. 3 is a schematic diagram showing a traveling-related control mechanism.

FIG. 4 is a block diagram showing a traveling-related control circuit.

FIG. 5 is a flowchart showing a driving-related control procedure.

FIG. 6 is a coordinate diagram showing a driving-related control level.

FIG. 7 is a flowchart showing a driving-related control procedure.

FIG. 8 is a coordinate diagram showing a driving-related control level.

FIG. 9 is a block diagram showing a grain-control-related control circuit.

FIG. 10 is a schematic view showing a work state related to grain loss.

[Explanation of symbols]

 1 throttle

Claims (1)

[Claims] 1. In an agricultural work vehicle in which the engine speed n is detected and the throttle 1 or the vehicle speed is controlled so as to maintain the engine speed n at a set value N, the fluctuation range of the engine speed n near the set value N is constant. A vehicle speed control device for increasing the vehicle speed when the vehicle speed is within a predetermined range.