JPH0453388B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sensor operation inspection device for a working vehicle equipped with an automatic control device that sets the posture of a working device based on signals from a plurality of analog sensors. Regarding.

[Conventional technology]

Taking an agricultural tractor as an example of a working vehicle, the agricultural tractor is equipped with an electric control device that automatically raises and lowers a rotary tiller to maintain the set plowing depth, and automatically rolls the rotary tiller to maintain the set plowing depth. Conventionally, as a means for inspecting the sensor that inputs signals to this control device, there is a method as shown in Japanese Utility Model Application Publication No. 182108/1983.
Some use a voltmeter.

In other words, in automatic plowing depth control, a sensor is usually provided to detect the plowing depth by the rocking of the rear cover of the tiller, so a voltmeter is connected to a terminal installed in the signal path from the sensor that is input to the control device. After setting, the rear cover was swung by hand, and the voltage change for a predetermined amount of swiveling was compared with data obtained in advance.

[Problem to be solved by the invention]

However, the inspection means with the configuration shown in the above reference not only requires a voltage measuring device such as a tester, but also requires time and effort to compare the voltage change with respect to the sensor's operating stroke with data. Furthermore, since the output level differs from sensor to sensor, it is currently necessary to change the measurement range of a tester or the like for each sensor to be tested.

In particular, when a work vehicle equipped with a large number of sensors is targeted, the data to be compared differs due to the characteristics of each sensor, which is extremely time-consuming and leaves room for improvement.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that can easily inspect each sensor even if the vehicle is equipped with a large number of sensors.

[Means to solve the problem]

As described at the beginning, the present invention is characterized by a sensor operation inspection device for a working vehicle equipped with an automatic control device that sets the posture of a working device based on signals from a plurality of analog sensors. An inspection object selection switch that selectively selects signals from a plurality of analog sensors, a correction means that corrects the output signal of each analog sensor selected by the inspection object selection switch to a predetermined value, and this correction means. and a check clamp group for displaying the determined results at each check point. Its functions and effects are as follows.

[Effect]

When the above characteristics are configured as shown in FIGS. 1 and 2, for example, the connectors 25 from each sensor S connected to the control device 17 are separated,
It is connected to the connector 25a of the inspection device 26.

Next, when checking the operation of the cover sensor 16, for example, by setting the selection switch 35 of the inspection device 26 to "depth" and swinging the rear cover 4a by hand, the output signal from the sensor 16 is detected. is corrected by the correcting means 39 and then the discriminating means 40
The appropriateness of the output signal value is determined by The lamps L ₁ , L ₂ , and L ₃ will light up in correspondence with each other, and if the operation of this sensor 16 is not proper, the oscillation angle and the ignition of the lamps L ₁ , L ₂ , and L ₃ will be changed. becomes incompatible. Also, the tilt sensor 14
When examining the operation of
The lamps L ₁ , L ₂ , and L ₃ are ignited each time they reach 10°, 0°, and +10°, and if the sensor 14 is not operating properly, the respective swing angles and The lighting of lamps L ₁ , L ₂ , and L ₃ will not be opposed to each other.

In other words, in the present invention, although it is a single device, it is possible to determine whether or not a plurality of analog sensors are operating properly by blinking the lamps.

〔Effect of the invention〕

Therefore, it is easy to use without using voltage measurement equipment such as a tester, and without the hassle of checking sensor operation against data or changing the range of the tester. The result is a device that can test multiple sensors.

In particular, in the present invention, since a sensor is selected by a selection switch, comparing the data with a comparison has another effect of eliminating mistakes such as erroneous operation or misreading of data.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 5 and 6, a bracket 2 is attached to the rear end of the traveling vehicle body 1 and is rotatable about a longitudinal axis P. At the rear of this bracket 2, a bracket 2 is mounted that can be rotated vertically about a left-right axis Q. A pair of freely movable left and right links 3, 3 are pivotally connected, a rotary type ground work device 4 is attached to the rear ends of the links 3, 3, and a hydraulic cylinder 5 is provided at the rear of the traveling vehicle body 1 so that it can be driven up and down. The pair of left and right lift arms 6, 6 and the links 3, 3 are connected by a pair of lift rods 7a, 7b, and a telescopic hydraulic cylinder 8 is interposed in one of the lift rods 7b. An agricultural tractor is configured as an example of a working vehicle in which the device 4 can be moved up and down and rolled.

The agricultural tractor includes a position control for raising and lowering the working device 4 to an arbitrarily set position with respect to the vehicle body 1, and a rolling control for maintaining the ground working device 4 in a set horizontal and horizontal tilted posture relative to the ground.
It is equipped with a control mechanism capable of three types of control: automatic plowing depth control for maintaining the above-mentioned ground work device 4 at a set plowing depth.

That is, a boarding operation section 9 is formed in the center of the vehicle body 1, and a lever 11 that is located on the side of the seat 10 and can be operated in two operation areas X and Y is provided in this operation section 9. A potentiometer 12 is attached to the base end of the lever 11. Further, a potentiometer 13 is attached to the lift arm 6 to detect its swing angle, and a sensor 14 is provided at the rear of the vehicle body 1 to detect the left and right inclination of the vehicle body 1. Said lift rod 7
A stroke sensor 15 for detecting the amount of expansion and contraction thereof is provided on the hydraulic cylinder 8 installed in the hydraulic cylinder 8, and a sensor 16 is provided on the ground work device 4 for detecting the amount of swing of the swing type rear cover 4a.

Furthermore, a control device 17 is provided on the side of the operating section 9.
A control box 18 is provided, and a control panel 18 of this box 18 is provided.
As shown in FIG.
9, plowing depth setting device 20, rolling angle setting device 21,
A plowing depth control sensitivity setter 22 and a switch 23 for forcibly raising the working device 4 are provided.

As shown in FIG. 3, signals from each potentiometer, sensor, setting device, and switch are input to the control device 17, and based on these signals, the two hydraulic cylinders 5 and 8 are activated. A control device 17 is configured to drive and operate the corresponding electromagnetic valves V ₅ and V ₈ .

By setting the lever 11 at any position in the operating range 4 is in the automatic plowing depth control state. Furthermore, the work selection switch 19
It can be switched to four positions: a position OFF where the control device 17 is not activated, a position A where automatic plowing depth control is performed, a position R where rolling control is performed, and a position A and R where automatic plowing depth control and rolling control are performed simultaneously.

Further, the tillage depth control sensitivity setting device 22 is used to set a so-called dead zone width for maintaining the working device 4 at that level during automatic tillage depth control.
Furthermore, in addition to this sensitivity setting, by setting the operating positions D, M, and U shown in FIG. 4, the working device 4 can be lowered to any level, stopped, or It is now possible to raise the level.

Further, the forcible raising switch 23 can be pressed to forcibly raise the working device 4 to a predetermined level even if it is in an automatic control state.
The lamp 23a built in 3 is lit. and,
By pressing the button again, the switch 23 is projected to its original state, the working device 4 is returned to its original control state, and the lamp 23a is turned off.

As shown in FIG. 3, the control device 17 has a cord 24 from the potentiometer, sensor, etc.
... is drawn in, and this cord 24 is provided with a connector 25 so that it can be separated.

Here, the potentiometer 12 provided on the lever 11, the potentiometer 13 provided on the lift arm 6, the left/right tilt sensor 14, the stroke sensor 15, and the sensor 16 provided on the rear cover 4a are collectively referred to as analog sensor S. . A device 26 for inspecting the operation of this sensor S is configured as follows.

That is, as shown in FIGS. 1 and 2, the inspection device 26 includes connectors 25a that can be connected to the connectors 25 provided on the cords 24 from each of the analog sensors S, and the electromagnetic valves V ₅ and V. Connector 2 interposed between cords 27 and 28 that control ₈
Connectors 29a, 30a that can be connected to 9, 30,
A connector 32a that can be connected to a connector 32 interposed in a cord (not shown) of an oil pressure switch 31 of an engine (not shown) provided in the vehicle body 1.
and a grounding connector 33 are attached to the ends of the input cable 34, and the device 2
On the panel surface 26a of 6, there is a rotary operation type inspection target selection switch 35, a lamp group L consisting of three light emitting diodes, and the electromagnetic valve for raising and lowering the lift arm.
Switches 36 and 37 for forcibly driving _V5 and the rolling electromagnetic valve _V8 , respectively, and a power lamp 38 are provided.

The signals from the connectors 25a... are guided to the selection switch 35 via the amplifying device 39... as a correction means for matching, and only the signals selected by this switch 35 are processed by comparators, logic gates, etc. 3 according to the magnitude of the signal (high/low voltage) inputted to the discrimination circuit 40 and from each sensor S.
The lamps L ₁ , L ₂ , and L ₃ are turned on one after another in sequence. Moreover, the switches 36, 3
7 uses a neutral recovery type, and by operating these switches 36 and 37, the solenoid valves V ₅ and V ₈
The power lamp 38 is connected to the oil pressure switch 31 to be turned on and off.

Further, the selection switch 35 can be operated in five positions: "depth of plowing", "lever", "stroke", "lift", and "tilt", and the selection switch 35 can be operated at each position.
Five types of numerical values and units indicating the detected amount are displayed on the lamp group L so that when the lamp group L is operated, the result detected by the lighting of the lamp group L can be determined.

The sensor S is inspected after connecting each connector, starting the engine of the vehicle body 1, and confirming that the power lamp 38 is turned off. In other words, after starting the engine, the power lamp 38 If it continues to light up, it can be determined that the oil pressure switch 31 is defective.

Next, when inspecting the rear cover sensor 16,
Set the selection switch 35 to "deep plowing", swing the rear cover 4a by hand, and make sure that the actual swing angle and the swing values indicated by the three lamps L ₁ , L ₂ , and L ₃ match. Check whether All you have to do is check the other sensors in the same way, stroke sensor 1
5 and the lift arm sensor 13 are operated by actually operating the hydraulic cylinders 5 and 8 by operating the switches 36 and 37, respectively. Also, the tilt sensor 14 vehicle body 1
This will be done by jacking up and tilting it.

Note that 41 in the figure is a battery mounted on the vehicle body 1, and the grounding connector 33 is connected to the vehicle body ground terminal.

[Another example]

In addition to the embodiments described above, the present invention may be configured such that the inspection device 26 is incorporated into the control device 17, and the number of lamps and the types of sensors to be inspected may be set in any manner.

[Brief explanation of the drawing]

The drawings show an embodiment of the sensor operation inspection device according to the present invention, FIG. 1 is a block electrical circuit diagram of the device, FIG. 2 is a front view of the device, and FIG. 3 is a block diagram showing the control system. Figure 4 is a plan view of the control box, Figure 5 is a side view of the rear of the agricultural tractor,
FIG. 6 is a schematic rear view of the agricultural tractor. 4... Working device, 17... Automatic control device, 35
...Inspection object selection switch, 39...Correction means,
40...discrimination means, S...sensor.

Claims (1)

[Claims] 1 Automatic control device 1 that sets the posture of the work device 4 based on signals from a plurality of analog sensors S
7, an inspection target selection switch 35 for selectively selecting signals from the plurality of analog sensors S;
For each analog sensor S selected by the inspection target selection switch 35, a correction means 39 corrects its output signal to a predetermined value, and based on the signal from the correction means 39, the operating stroke of the analog sensor S is adjusted. A sensor operation testing device comprising a determining means 40 for determining whether the output value of the sensor output signal is appropriate for each predetermined check point, and a check clamp group L for displaying the determined results for each check point.