JP2003293918A - Operation restraining circuit of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a constitution and reduce cost of an operation restraining circuit, to easily perform an operation of operation restraining equipment even during maintenance with a controller removed, and to use detection by each switch of the operation restraining circuit for a controlling operation of the controller. <P>SOLUTION: A plurality of switches S for restraining operation are connected to the operation restraining equipment 2 in series, and a predetermined switch S is connected to the controller 8 via switching circuit 7 employing a transistor connected to the switch S in parallel. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation check circuit for a working machine.

[0002]

2. Description of the Related Art Conventionally, in an engine starter operation check circuit of a tractor, which is an example of an operation check circuit of a working machine, for example, a shift switch for detecting whether or not a shift lever is in a neutral position, an operating state of a main clutch. Is equipped with a clutch switch for detecting the above, a PTO switch for detecting the transmission state to the power take-off shaft, and the like, and is connected to the control device so that the operating state of each of these switches can be detected. Based on the operating state of each switch, determine whether the operation of the engine starter is acceptable, and if it is determined that the operation of the engine starter is acceptable, switch the starter relay to the closed state. , The operation of the engine starter by operating the key switch is permitted, and the operation of the engine starter is permitted. If it is determined that have state, to maintain the open state of the starter relay, there is one configured to block the operation of the engine starter by operating the key switch. According to this configuration, the detection by each switch has an advantage that it can be used for the control operation such as the failure diagnosis in the control device.However, at the time of maintenance with the control device removed, the engine should be started as necessary. The operation of the starter causes inconvenience that cannot be easily performed.

Therefore, in recent years, as shown in FIG. 3, for example, the above-described speed change switch 3, which is connected to the control device 8,
Each of the clutch switch 4 and the PTO switch 5 is connected to a relay 18 to 20 which is switched to a closed state in accordance with a closing operation of the corresponding switch 3 to 5, and each of the relays 18 to 20 is used for operation restraint. As a result of being connected in series to the starter relay 6, the detection by the switches 3 to 5 can be used for control operation such as failure diagnosis in the control device 8, and the engine starter 2 can be used even during maintenance when the control device 8 is removed. It has been considered that the engine can be easily started by the operation of.

[0004]

However, in the above engine starter operation restraint circuit, since the operation of the engine starter is restrained by the plurality of relays, it is not necessary to provide the control device with the control program for restraining the engine starter operation. However, the control configuration can be simplified by that amount, but since multiple relays are equipped and each relay must be connected to another relay or a corresponding switch with a harness, the configuration becomes complicated and the cost increases. It was inconvenient.

It is an object of the present invention to simplify the structure of an operation check circuit and to reduce the cost, and at the same time, it is possible to easily operate a controlled check device even at the time of maintenance with the control device removed, and to check the operation check. The detection by each switch of the circuit is to be used for the control operation of the control device.

[0006]

[Means for Solving the Problems] [Structure] In order to achieve the above object, in the invention according to claim 1 of the present invention,
A plurality of switches for actuation restraint were connected in series to the actuated restraint device, and the predetermined switch was connected to the control device via a switching circuit using a transistor connected in parallel to the switch.

[Operation] According to the invention described in claim 1, when each switch is switched to a state in which the operation of the operated restraining device is permitted, the operated restraining device can be operated. Also, if any one of the switches has not been switched to a state in which the operation of the operated restrained device is permitted, the operated restrained device cannot be operated.

That is, since the operation of the actuated restraint device can be restrained by a plurality of switches, the configuration required for the actuate restraint is more than that of the above-mentioned prior art in which the actuated restraint device is actuated by a plurality of switches and relays. It will enable simplification and cost reduction.

Further, since this operation check does not go through the control device, it is not necessary to provide the control device with a control program for the operation check, and the operated check device is operated even when the control device is removed. Will be able to.

Furthermore, since the detection by the predetermined switch is individually input to the control device via the corresponding switching circuit, the detection by the predetermined switch can be used for control operation such as failure diagnosis in the control device. Will be able to.

Moreover, since the switching circuit can be constructed on the board of the control unit having the control device, compared with the above-mentioned prior art which requires a plurality of relays for restraining the operation and requires a large number of connections by a harness,
This makes it possible to simplify the configuration and reduce the cost for making the detection by the predetermined switch available for the control operation of the control device.

[Effects] Therefore, by connecting each switch for operation restraint in series to the actuated restraint device, the configuration required for the actuation restraint is simplified, the cost is reduced, and the control configuration in the control device is simplified. It is possible to satisfactorily perform proper operation check and control, and even when maintenance is performed with the control device removed, the operated check and control device can be easily operated as necessary, which facilitates maintenance. Furthermore, by connecting a predetermined switch to the control device via a switching circuit, while simplifying the configuration and reducing the cost, the detection by the predetermined switch of the operation check circuit can be performed. It can be used for control operation of a control device.

[Arrangement] In order to achieve the above object, in the invention according to claim 2 of the present invention, a plurality of switches for actuating restraint are connected in series to the actuated restraint device, And a resistor having different values connected in parallel to the switch and the AD converter were connected to the control device.

[Operation] According to the invention described in claim 2, when each switch is switched to a state in which the operation of the operated restraining device is permitted, the operated restraining device can be operated. Also, if any one of the switches has not been switched to a state in which the operation of the operated restrained device is permitted, the operated restrained device cannot be operated.

In addition, the AD converter outputs a digital signal corresponding to the potential that changes according to the state of each switch, and the control device detects the state of each switch based on the output signal and the individual signals by each switch are detected. Get to know the detection.

That is, since the operation of the actuated restraint device can be restrained by the plurality of switches, the configuration required for the actuate restraint can be compared with the above-mentioned conventional technique in which the actuated restraint device is actuated by the plurality of switches and relays. It will enable simplification and cost reduction.

Further, since this operation check does not go through the control device, it is not necessary to provide the control device with a control program for operation check, and in addition, the operated check device can be operated even with the control device removed. Will be able to.

Moreover, since the control device grasps the individual detection of each switch based on the potential information after the conversion by the AD converter, the detection by each switch is used for the control operation such as the failure diagnosis in the control device. It will be available.

In addition, since the potential detecting and converting circuit including the plurality of resistors and the AD converter can be formed on the substrate of the control unit including the control device, a plurality of relays are provided for controlling the operation, and a large number of connections by harnesses are required. As compared with the above-described conventional technique, it is possible to simplify the configuration and reduce the cost for making the detection by each switch available for the control operation of the control device.

[Effects] Therefore, by connecting each switch for operation check in series to the operated check device, simplification of the configuration required for operation check and cost reduction, and simplification of the control configuration in the control device It is possible to satisfactorily perform proper operation check and control, and even when maintenance is performed with the control device removed, the operated check and control device can be easily operated as necessary, which facilitates maintenance. Moreover, by connecting each switch to the control device via a resistor and an AD converter, the switch of the operation check circuit can be configured while simplifying the configuration and reducing the cost. The detection can now be used for the control operation of the control device.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 shows an engine starter operation check circuit of a tractor which is an example of an operation check circuit of a working machine. This engine starter operation check circuit is a key switch. 1 and an engine starter 2 which is an example of an actuated restraint device 2, as a switch S for actuating restraint, a shift switch 3 for detecting a traveling shift state from an operating position of a shift lever (not shown), a clutch (not shown) A clutch switch 4 that detects the operating state of the main clutch (not shown) from the pedal operating position and a PTO switch 5 that detects the transmission state from the operating position of the working clutch lever (not shown) to the power take-off shaft are connected in series. It consists of:

The shift switch 3 is configured to be closed when the shift lever is operated to the neutral position and to be opened when operated from the shift lever neutral position. The clutch switch 4 is a clutch pedal. Is configured to be closed in response to a depression operation to the disengaged position, and to be opened in response to the return of the clutch pedal to the engaged position, and the PTO switch 5 is associated with the operation to the disengaged position of the work clutch lever. It is configured to be opened and closed in response to the operation of the work clutch lever to the engaged position.

That is, the starter relay 6 of the engine starter 2 is closed only when the shift lever is operated to the neutral position, the clutch pedal is depressed to the disengaged position, and the work clutch lever is operated to the disengaged position. The operation of the engine starter 2 by switching the key switch 1 is permitted, and the engine starter (not shown) can be started by the operation of the engine starter 2.

The speed change switch 3, the clutch switch 4, and the PTO switch 5 are connected to a control device 8 composed of a microcomputer via a switching circuit 7 connected in parallel corresponding to the switches 3 to 5. There is. Each switching circuit 7 is composed of a PNP transistor 11, an NPN transistor 12 and the like arranged on a substrate 10 of a control unit 9 including a control device 8. When the corresponding switches 3 to 5 are open, the transistors 11 and 12 are formed. Switches to the ON state to switch the voltage level to the control device 8 to the L level, and when the corresponding switches 3 to 5 are closed, the transistors 11 and 12 switch to the OFF state to set the voltage level to the control device 8 to the H level. It is designed to switch to.

That is, the detections by the speed change switch 3, the clutch switch 4, and the PTO switch 5 can be individually input to the control device 8 via the corresponding switching circuit 7, and control such as failure diagnosis in the control device 8 can be performed. It is available for operation.

The input section of each switching circuit 7 is
A resistor 13 is provided to prevent the starter relay 6 of the engine starter 2 from switching to the closed state only when the shift switch 3, the clutch switch 4, and the PTO switch 5 are all closed.

[Second Embodiment] FIG. 2 shows an engine starter actuation check circuit of a tractor which is an example of an actuation check circuit of a working machine. This engine starter actuation check circuit comprises a key switch 1 and an actuated check circuit. Between the engine starter 2, which is an example of the restraint device 2, as a switch S for actuating restraint, a shift switch 3 for detecting a traveling shift state from an operating position of a shift lever (not shown), an operating position of a clutch pedal (not shown) The clutch switch 4 for detecting the operating state of the main clutch (not shown) and the PTO for detecting the transmission state from the operating position of the work clutch lever (not shown) to the power take-off shaft
It is configured by connecting the switches 5 in series.

The gearshift switch 3 is configured to be closed when the gearshift lever is operated to the neutral position and to be opened when the gearshift lever is operated from the neutral position. The clutch switch 4 is a clutch pedal. Is configured to be closed in response to a depression operation to the disengaged position, and to be opened in response to the return of the clutch pedal to the engaged position, and the PTO switch 5 is associated with the operation to the disengaged position of the work clutch lever. It is configured to be opened and closed in response to the operation of the work clutch lever to the engaged position.

That is, the starter relay 6 of the engine starter 2 is closed only when the shift lever is operated to the neutral position, the clutch pedal is depressed to the disengaged position, and the work clutch lever is operated to the disengaged position. The operation of the engine starter 2 by switching the key switch 1 is permitted, and the engine starter (not shown) can be started by the operation of the engine starter 2.

The speed change switch 3, the clutch switch 4, and the PTO switch 5 correspond to the respective switches 3 to 5 and are connected in parallel in three resistors 14 to 4 having different values.
16 and an AD converter 17 are connected to the control device 8 including a microcomputer. The three resistors 14 to 16 and the AD converter 17 are arranged on the substrate 10 of the control unit 9 including the control device 8, and the AD converter 17 includes the shift switch 3, the clutch switch 4, and the P switch.
It is configured to output to the control device 8 a digital signal corresponding to the potential that changes according to the state of the TO switch 5.

As a result, the control device 8 detects the states of the speed change switch 3, the clutch switch 4, and the PTO switch 5 based on the potential information converted by the AD converter 17, and detects the individual states of the respective switches 3 to 5. The detection by the shift switch 3, the clutch switch 4, and the PTO switch 5 can be used for control operations such as failure diagnosis in the control device 8.

[Other Embodiments] Other embodiments of the present invention will be listed below. (1) The work machine may be a rice transplanter, combine harvester, backhoe, or the like. (2) As the operated restraint device 2, the engine starter 2 is used.
It is not limited to. (3) The switch S for controlling the operation may be a seating switch for detecting seating on the driver's seat, a brake switch for detecting the operating state of the brake, or the like.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an operation restraint circuit according to a first embodiment.

FIG. 2 is a diagram showing a configuration of an operation restraint circuit according to a second embodiment.

FIG. 3 is a diagram showing a configuration of a conventional operation check circuit.

[Explanation of symbols]

2 Actuated restraint equipment 7 Switching circuit 8 control device 14 resistors 15 resistors 16 resistors 17 AD converter S switch

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takanori Miura             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory

Claims (2)

[Claims] 1. A control device in which a plurality of switches for actuating restraint are connected in series to an actuated restraint device, and the predetermined switch is connected through a switching circuit using a transistor connected in parallel to the switch. The operation check circuit of the working machine connected to. 2. A plurality of switches for actuating restraint are connected in series to the actuated restraint device, and resistors of different values are connected in parallel to the respective switches.
An operation check circuit of a working machine connected to a control device via an AD converter.