JP5575023B2 - Working machine - Google Patents

Description

  The present invention relates to a working machine such as a tractor, a combiner, a backhoe or the like.

  Conventionally, various types of display devices have been developed for work machines such as tractors, combines, and backhoes. The display device is provided around the driver's seat in order to appropriately display information necessary for the worker. Information necessary for the worker includes operation information related to the operation of the work machine such as the engine speed, the remaining amount of fuel, and the coolant temperature, and warning information for notifying the work machine of abnormality.

Since the worker needs a plurality of types of information such as the above-described operation information and warning information, the display device can display the operation information such as the engine speed, the remaining fuel amount, the cooling water temperature, and the warning information. It is configured.
Patent Document 1 discloses a display device (display unit) that displays such a plurality of types of information.

  A display device for a work machine disclosed in Patent Document 1 is a display device for a work machine provided with notification information display means for displaying notification information to be notified to an operator during operation of the work machine, wherein the notification information display means includes: A main display unit, and an auxiliary display unit arranged in parallel to the main display unit, wherein the main display unit is configured to display a work speed as the notification information, and the auxiliary display unit However, it is configured to be an image display type, and as the notification information, a plurality of types of notification information other than the notification information displayed on the main display unit are displayed side by side.

  The above-mentioned operation information and warning information are obtained by a plurality of sensors (detectors) provided at various locations on the work machine. These sensors are not only connected to the control unit of the display unit described above, but also connected to a control device (main control unit) that controls the operation of the work implement. Therefore, the control unit of the display unit displays the above-described operation information and warning information while communicating with the main control unit that controls the operation of the work implement. As a technique used for such communication, there is a vehicle communication network called CAN (Controller Area Network).

Patent Document 2 discloses a work machine control device that performs communication using the CAN.
In the work machine control device disclosed in Patent Literature 2, data is transmitted and received between the display control device and the main control device through a vehicle communication network such as CAN. At this time, the display control device receives the operation information and warning information obtained by the sensor connected to the main control device from the main control device via the CAN and displays them.

JP 2007-37511 A JP 2010-174507 A

  For example, in the case of a tractor or the like, it is necessary to check the operation of the work device attached to the rear, and the operator must alternately check the front of the tractor moving forward and the rear of the work device operating. Therefore, in addition to the first display device provided in front of the driver's seat, a second display device that displays operation information such as the PTO rotational speed and the vehicle speed necessary for the operation of the work device is provided on the side of the driver's seat. It is done. Thus, although a device for reducing the burden on the operator by reducing the movement of the line of sight has been devised, the tractor includes two display devices, a first display device and a second display device.

  Similar to the contents disclosed in Patent Literature 1 and Patent Literature 2, the first and second display devices each have a control unit. A detector such as a sensor is connected to each control unit so that information detected by the detector is input and information from the main control unit of the work implement is also input. Each control unit processes information input from the detector and the main control unit with a control program or the like, and displays the information on a pointer type or liquid crystal type display unit provided in the display device.

Here, if it is going to change the display form on a display part, the specification of a display part, etc. about a some display apparatus, the control program in each control part of a some display apparatus must be rewritten. In response to this rewriting, it may be necessary to change the program of the main control device of the tractor.
That is, every time the specifications of the display device are changed, various programs need to be changed in both the control unit of the display device and the main control unit of the tractor. In particular, when a plurality of display devices are provided, changing the program becomes very complicated, and the cost required for these changes also increases.

  In view of the above problems, an object of the present invention is to provide a work machine that can easily change the type (model) and specifications of a display device even when a plurality of display devices are provided. Is.

The technical means of the present invention for solving this technical problem is characterized by the following points.
In the work machine according to claim 1, a plurality of display devices capable of displaying a state detected by a detector, the display device is connected via a vehicle communication network, the detector is connected, and the detection A main control unit that outputs detection information indicating a state detected by a device to the plurality of display devices, and the main control unit outputs identification information for identifying a display device that displays the detection information an identification information output means for, and a detecting information output means for outputting the detection information, the plurality of display devices, respectively, and a slave controller for operating the display device and display for displaying the detection information together provided, when the identification information output means is designated by the output identification information, and displays the detected information output by the detection information output unit, the main control unit causes the display unit of the detection information Control information output means for outputting control information for designating a display form to be performed, wherein the sub-control unit determines whether or not the information is specified by the identification information output by the identification information output means And the detection information output by the detection information output means is displayed in a display form specified by the control information when it is determined by the identification information determination means that the detection information is specified in the identification information. display control means for controlling the vessel, characterized that you have provided a.

The present invention has the following effects.
According to the first aspect of the present invention, in the work machine including a plurality of display devices, the plurality of display devices can be controlled by the main control unit of the work machine.
According to the invention which concerns on Claim 2, in the working machine provided with a some display apparatus, the control which the said some display apparatus performs can be made simple.

It is a block diagram which shows the control system of the working machine by embodiment of this invention. It is a front view which shows a meter panel, (a) is a front whole view of a meter panel, (b) is a front view of the segment type | mold display part of a meter panel. It is a front view of a liquid crystal monitor. It is the flowchart which showed an example of the operation | movement which displays an engine speed. It is the flowchart which showed an example of the operation | movement which displays the warning of a fuel and water temperature. It is the flowchart which showed an example of the operation | movement which displays a vehicle speed and PTO rotation speed. It is a figure which shows the combination of detection information and the display in a display apparatus. It is a side view which shows the whole working machine by this embodiment. It is a block diagram which shows arrangement | positioning of the detector used for the control system of the working machine by this embodiment, a display apparatus, and a control part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 8 is a view of the working machine according to the embodiment of the present invention as viewed from the side. In FIG. 8, the tractor 2 is illustrated as the work machine according to the present embodiment. However, the work machine is not limited to the tractor 2, and is a machine that performs other work, whether it is a combiner or a backhoe. May be.

First, the overall configuration of the tractor 2 will be described.
As shown in FIG. 8, the tractor 2 is configured by mounting an engine (for example, a diesel engine) 11, a transmission 12, and the like on a traveling vehicle body 10 that includes wheels on the front and rear sides. A three-point link mechanism 16 is provided at the rear portion of the traveling vehicle body 10 so as to be movable up and down.
Various working devices called implements (in the illustrated example, a tilling device) 13 are detachably attached to the three-point link mechanism 16.

In addition to the three-point link mechanism 16, a PTO shaft 17 to which power from the engine 11 is transmitted is also provided at the rear portion of the traveling vehicle body 10. The work device 13 is connected to the PTO shaft 17 and operates by the rotation of the PTO shaft 17.
In addition, an independently mounted cabin 14 is provided behind the engine 11, and a driver seat 15 is provided in the cabin 14.

FIG. 9 is a diagram illustrating devices mounted on the tractor.
As shown in FIG. 9, the tractor 2 includes a plurality of detectors for detecting the operation state and the operation state of the tractor 2, a plurality of controllers for controlling the operation and operation of the tractor 2, And a plurality of display devices for performing display relating to operation and driving.
Each detector includes a plurality of switches 20 and a plurality of sensors 40. Each detector is not limited to the switch 20 and the sensor 40. Each controller mainly includes a main ECU 50 (main control unit) that performs overall control of the tractor 2, an engine ECU 60 that controls the engine 11 separately from the main ECU 50, and a shift or forward / reverse switching while the tractor 2 is traveling. It is comprised from the transmission valve 90 which performs. Each controller is not limited to the main ECU 50, the engine ECU 60, and the transmission valve 90.

Each display device includes a meter panel 30 installed in front of the driver's seat, and a liquid crystal monitor 80 installed on the side of the driver's seat separately from the meter panel 30. Each display device is not limited to the meter panel 30 and the liquid crystal monitor 80.
The tractor 2 according to this embodiment of the present invention is characterized by control and operation of a controller (main ECU 50) and a display device (meter panel 30 and liquid crystal monitor 80). Before describing the operations of the main ECU 50 and the display device, the configuration of the tractor 2 will be described in more detail.

A plurality of switches 20 provided in the tractor 2 will be described below with reference to FIG.
The front wheel turning angle switch 20a is provided in the arm portion of the front wheel. When the front wheel moves and reaches a predetermined turning angle, the switch is turned “ON”. When the front wheel turning angle switch 20a is turned "ON", it can be detected that the front wheel has been cut beyond a predetermined angle.

The shuttle switch 20b is a switch that detects the forward / neutral / reverse position of the shuttle lever that switches the forward / backward movement of the tractor 2. For example, the shuttle switch 20b is provided at the root of the shuttle lever. The shuttle switch 20b has three contact points, and detects forward, neutral, and reverse positions based on the positions of the contact points.
The pressure switch 20c is a switch that detects the operation of each hydraulic clutch in the transmission 12, and is provided in the shift valve 90 that switches between the main shift and the sub shift. The pressure switch 20c is a normally open switch, and the contact is closed when the pressure increases. For example, the contact is closed when the pressure is about 1.2 MPa or more, and the contact is opened when the pressure is about 0.8 MPa or less.

The shift lever 20d is a lever for switching the sub shift by moving back and forth. The shift lever 20d is provided with a sensor for detecting the shift position “L / H”, and is also provided with a shift button (up / down) for switching the main shift and a clutch button.
The engine speed upper limit setting dial 20e is used to set an upper limit of the engine speed by an operation with an accelerator pedal and an accelerator lever, a memory setting speed, or the like, using a dial.

Next, the plurality of sensors 40 provided in the tractor 2 will be described below.
The crank position sensor 40a is, for example, a magnetoresistive element attached to the outer periphery of the flywheel of the engine 11, and detects a crank position for each rotation of the flywheel and outputs a signal. In other words, a signal is output every time the flywheel makes one rotation, and the rotation speed of the flywheel can be detected by detecting this signal.

Since the main ECU 50 calculates the engine speed based on the signal output from the crank position sensor 40a, the crank position sensor 40a also serves as the engine rotation sensor. The main ECU 50 also calculates the rotational speed of the PTO shaft 17 (PTO rotational speed) by converting the calculated engine rotational speed.
The water temperature sensor 40b is a sensor that detects the temperature of the engine coolant as a voltage value. The fuel sensor 40c is a sensor that detects, with a variable resistor, the position of the float in the fuel tank that changes depending on the remaining amount of fuel. The vehicle speed sensor 40d is a sensor that detects the vehicle speed based on the number of rotations of a sensor rotor provided in the transmission 12. The oil temperature sensor 40e is a sensor that detects the temperature of the mission oil.

The shuttle rotation sensor 40 f is a sensor that detects the rotation speed of the output shaft of the master clutch of the transmission 12. The accelerator lever sensor 40g is a sensor for detecting the operation position of the accelerator lever and setting the engine speed. The accelerator pedal sensor 40h is a sensor that detects the amount of operation of the accelerator pedal.
The engine control ECU 60 and the main ECU (main control unit) 50 provided in the tractor 2 will be described with reference to FIG. FIG. 1 is a block diagram showing a control system in the tractor 2.

  The engine control ECU 60 includes, for example, a CPU and the like, and is based on an accelerator pedal operation amount detected by the accelerator pedal sensor 40h, a crank position detected by the crank position sensor 40a, and the like, an injector, a common rail, a supply pump, and the like. Is to control. The control of the engine control ECU 60 according to the present embodiment is the same as the control of a general diesel engine. For example, in the control of the injector, the fuel injection amount, the injection timing, and the fuel injection rate are set, and the supply pump and the common rail are set. In this control, the fuel injection pressure is set.

  The main ECU (main control unit) 50 is composed of a CPU, for example, and the main ECU 50 is connected to a detector (each sensor 40 and the switch 20 described above). The main ECU 50 performs each control (shift, hydraulic pressure, double speed) based on information (detection information) obtained from each sensor 40, the switch 20, etc., and displays sensor information and control information necessary for the control on a display device ( The entire tractor 2 is controlled while being shared with the meter panel 30, the liquid crystal monitor 80) and the engine control ECU 60.

  As an example, the shift control will be described. When the change input of the main shift stage number is made by the shift button (up / down) of the shift lever 20d during traveling, the main ECU 50 instructs the shift valve 90 to perform a main shift operation corresponding to the change input. For example, when a shift-up is input by a shift button during traveling at the main shift speed of 2nd speed, the main ECU 50 instructs the shift valve 90 to change the main shift speed to 3rd speed.

  When the shift is instructed, the shift valve 90 operates the electromagnetic ON-OFF valve to overlap the pressure of the main shift (second speed-3 speed) clutch and the pressure on the clutch side of the main shift (HL). Shifting from the 2nd speed to the 3rd speed is performed. Further, in the clutch control of the main transmission (HL) at this time, the axle load is calculated based on the engine speed set by the accelerator pedal sensor 40h and the actual engine speed from the crank position sensor 40a, and the control pressure of the clutch is set. Set.

  In the operation of the main ECU 50, when the operation state and the driving state of the tractor 2 detected by each sensor 40 are input to the main ECU 50, the main ECU 50 uses the input state of the tractor 2 as detection information to detect a vehicle communication network ( CAN communication network) N. The above-described engine control ECU 60 and display devices such as a meter panel 30 and a liquid crystal monitor 80 described later operate by acquiring detection information output to the CAN communication network N.

In the present embodiment, the main ECU 50 only needs to control the display device (the meter panel 30 and the liquid crystal monitor 80) in addition to the overall control of the tractor 2 as described above. Note that the control of the tractor 2 in the main ECU 50 is not limited to the illustrated shift control, and may be any control that performs control necessary for the operation of the tractor 2.
As shown in FIG. 1, the main ECU 50 according to the present embodiment controls the detection information output means 51, the identification information output means 52, and the control information output means 53, and controls the display device (meter panel 30, liquid crystal monitor 80). Have to do.

  The detection information output means 51, the identification information output means 52, and the control information output means 53 are configured by a control program stored in the main ECU 50, for example. The control program can be rewritten by, for example, a personal computer connected from the outside. In addition, these means may be comprised not only with the control program but with an electronic circuit, and may be comprised with things other than a control program and an electronic circuit.

  The detection information output means 51 outputs detection information indicating the state detected by each sensor 40 to the display device via the CAN communication network N. Specifically, the detection information output means 51 acquires various detection information such as the engine speed, the coolant temperature, the remaining fuel amount, and the vehicle speed from each of the sensors 40 described above. The detection information output means 51 replaces the acquired detection information with an electrical signal conforming to the CAN communication standard, and outputs it to the CAN communication network N.

More specifically, the detection information output means 51 replaces the detection information such as the engine speed, the remaining fuel amount, the water temperature, and the vehicle speed with an 8-bit electrical signal and puts it on the CAN communication data frame DF to place the CAN communication network N. Output to.
The detection information output means 51 outputs not only the actual measurement value detected by each sensor 40 but also warning information that the actual measurement value detected by the sensor 40 indicates an abnormal state as detection information.

  For example, when the measured value of the remaining amount of fuel indicates an abnormal value such as close to 0, the detection information output unit 51 replaces the detection information indicating that the fuel is insufficient with a warning signal, and transmits data for CAN communication. It is put on the frame DF and output to the CAN communication network N. When the actual measured value of the water temperature is an abnormally high value, the detection information output means 51 replaces the detection information indicating that the water temperature is abnormal with a warning signal, puts it on the data frame DF of CAN communication, and Output to the communication network N.

Since there are various types of detection information for each type of sensor 40, a communication protocol such as data arrangement is determined between the main ECU 50 and the display device so that each detection information can be distinguished.
The identification information output means 52 outputs identification information for identifying a display device that displays detection information. The identification information is information for identifying which of the meter panel 30 and the liquid crystal monitor 80 the display device that displays the detection information output from the detection information output means 51 is.

  The identification information output means 52 has a combination of the types of detection information and a display device (the meter panel 30 and the liquid crystal monitor 80) for displaying the detection information in advance. For example, the meter panel 30 for the remaining amount of fuel detected by the fuel sensor 40c, the meter panel 30 for the engine speed determined based on the signal output from the crank position sensor 40a, and the crank position sensor A combination of the liquid crystal monitor 80 and the like is held in advance for the PTO rotation speed obtained based on the signal output by 40a.

  Based on this combination, the identification information output means 52 outputs first identification information designating the meter panel 30 for the detection information corresponding to the meter panel 30, and for the detection information corresponding to the liquid crystal monitor 80. Outputs second identification information for designating the liquid crystal monitor 80. The combination (pattern) of the type of detection information and the display device (meter panel 30 and liquid crystal monitor 80) for displaying the detection information can be changed as appropriate by rewriting the control program constituting the identification information output means 52. It has become.

The control information output means 53 outputs control information for designating the display form of the detection information output from the detection information output means 51 on the display.
Here, the display means a segment type display unit D1, a single type LED display unit D2, and a pointer type display unit D3, which will be described in detail later. The meter panel 30 and the liquid crystal monitor 80, which are display devices, It is configured by combining three types of displays. The control information output means 53 outputs control information indicating in what display form the detection information is displayed on the display. A plurality of control information is prepared corresponding to a plurality of displays. For example, the first control information for controlling the display mode of the segment type display unit D1 and the display mode of the single type LED display unit D2 are controlled. There are second control information for controlling the display mode and third control information for controlling the display mode of the pointer type display unit D3.

  The segment type display unit D1 not only can freely display numbers, symbols, characters, etc., but can also freely display desired numbers, symbols, characters at predetermined positions, and has various display forms. The display form in the segment type display unit D1 is a form in which the detection information is expressed as to which kind of the detection information is to be displayed among numbers, symbols and characters, or in which position the detection information is to be displayed. That is.

The first control information designates a specific display form from among various display forms that the segment type display unit D1 has. For example, the engine speed, which is detection information, can be displayed numerically and left-justified or right-justified on the segment type display unit D1 by the first control information.
The single LED display unit D2 can be freely changed in display form not only by turning on, turning off, and blinking but also by changing lighting time, turn-off time, blinking interval, and brightness at the time of lighting. The second control information designates a specific display form from various display forms of the single LED display unit D2, and in which form the detection information is displayed among lighting, extinguishing and blinking. Or it is the information regarding the display form of what should be done about the lighting time at the time of showing detection information, a light extinction time, a blinking interval, and the brightness at the time of lighting.

For example, according to the second control information, a warning as detection information can be displayed on the single LED display unit D2 by blinking at intervals of 1 second, or can be displayed by lighting for several seconds.
As will be described later, the pointer type display unit D3 displays detection information according to the position indicated by the tip of the needle portion 76, and freely changes the position indicated by the needle portion 76 based on a numerical value obtained from the detection information. Can do. The third control information designates a specific display form from among various display forms of the pointer type display unit D3, and indicates which position the needle unit 76 indicates with respect to the numerical value obtained from the detection information. It is the information regarding a display form.

For example, the rotation angle of the needle portion 76 can be changed in arbitrary units with respect to the numerical value obtained from the detection information by the third control information. Even with the same numerical value (for example, 100), the position pointed to by the needle portion 76 can be in the middle of the rotation range, or can be in a state where it is swung to one end of the rotation range.
Here, the meter panel 30 and the liquid crystal monitor 80 constituted by a combination of the segment type display unit D1, the single type LED display unit D2, and the pointer type display unit D3 will be described with reference to FIGS.

As shown in FIG. 2A, the meter panel 30 includes a single LED display unit D2 (also referred to as LED display unit D2), a segment display unit D1a, and a plurality of pointer display units D3a to D3c. ing.
Specifically, when the meter panel 30 of FIG. 2A is viewed from the front, a single LED display unit D2 having 16 LED display units is provided in the center of the meter panel 30, and the single LED display unit D2 is provided. A segment type display portion D1a is provided on the upper side. Further, the left side of the single LED display D2 is an engine rotation pointer type display D3a (also referred to as a rotation pointer type display unit D3a), and the right side is a fuel pointer type display unit D3b and a water temperature pointer type display unit. D3c is provided side by side.

The single LED display unit D2 displays detection information detected by each sensor 40 by turning on, turning off, and blinking the LED element. Specifically, the single LED display section D2 is provided with a fuel LED display section D2a, a water temperature LED display section D2b, and the like.
The fuel LED display portion D2a is turned on when the fuel in the fuel tank becomes a predetermined amount or less based on the detection information from the fuel sensor 40c. The water temperature LED display D2c is lit when the temperature of the cooling water rises to a predetermined value or more based on the detection information from the water temperature sensor 40b, or when the water temperature sensor 40b becomes abnormal due to a failure or the like.

In addition, the meter panel 30 is provided with a double speed turn LED display, a differential lock LED display, an engine preheating LED display, etc., but the description thereof is omitted.
With reference to FIG.2 (b), the segment type | formula display part D1a is demonstrated. The segment type display unit D1a displays various information by turning on or off a plurality of liquid crystal segments (segment elements) 70. The segment type display portion D1a is composed of 82 liquid crystal segments 70 and three symbol display portions 71a to 71c that are also made of liquid crystals. Each of these three symbol display portions 71 a to 71 c can be regarded as one liquid crystal segment 70.

  In detail, in this segment type display part D1a, the segment group (it is called 7 segments) 72 comprised by the eight segments by the seven segments 70 is arrange | positioned at the upper stage, and eight lower stage left-right directions. A segment group 73 configured in an R shape with six segments is disposed on the upper left side, and a segment group 74 composed of 11 segments is disposed on the upper right side. Two segments 75 composed of dots (.) Are arranged between the seven segments arranged in the lower stage, and characters (AUTO, n / min) and symbols (gears, triangles, hourglasses) are arranged in the upper and lower stages. Etc.), three symbol display parts 71a to 71c are arranged. A segment type display portion D1a is constituted by these segment groups.

In the segment type display unit D1a, for example, numbers, characters, symbols, and the like can be displayed by 7 segments. Further, it is possible to display that a specific function of the tractor 2 is operating by the three symbol display portions 71a to 71c arranged around the 7 segments.
Each of the pointer-type display units D3a to D3c includes a needle unit 76 that rotates at a predetermined angle around the rotation center, and a gauge display unit 77 that is disposed so as to overlap the needle unit 76. Various types of information are displayed according to the scale drawn on the gauge display section 77 and the position of the scale indicated by the tip of the rotated needle section 76.

For example, when the meter panel 30 is viewed from the front, a water temperature pointer type display unit D3c is provided at the right end, and a fuel pointer type display unit D3b is provided to the left of the water temperature pointer type display unit D3c. .
When the tip of the needle section 76 points to the upper end of the gauge display section 77, the water temperature pointer type display section D3c indicates that the coolant temperature of the engine 11 is higher than the allowable range, When the tip of the needle portion 76 indicates the lower end of the gauge display portion 77, it indicates that the cooling water is at a very low temperature.

The pointer type indicator D3b for fuel indicates that the fuel is full when the tip of the needle 76 points to the upper end of the gauge indicator 77, and the tip of the needle 76 points to the lower end of the gauge indicator 77. Indicates that the remaining fuel in the fuel tank is low (or has run out).
The rotating pointer type display portion D3a rotates until the tip of the needle portion 76 turns clockwise (clockwise) from the lower left to the lower right. When the tip of the needle part 76 points to the lower left of the gauge display part 77, it indicates that the engine speed is low, and that the engine speed increases as the tip of the needle part 76 rotates clockwise. .

The meter panel 30 configured as described above includes a first slave control unit C1. The first slave control unit C1 is composed of, for example, a CPU or the like, and includes an identification information determination unit C1a and a display control unit C1b.
The identification information determination unit C1a determines whether or not the meter panel 30 is designated by the identification information output by the identification information output unit 53. The identification information determination unit C1a receives the identification information output from the detection information output unit 51, the identification information output unit 52, and the control information output unit 53 of the main ECU 50 via the CAN communication network N. The identification information determination unit C1a is configured to display on the meter panel 30 data such as detection information and control information sent from the main ECU 50 based on the identification information sent from the main ECU 50. Whether or not to accept data (detection information, control information) is determined.

When the identification information determination unit C1a determines that the data (detection information, control information) is received (received), the display control unit C1b displays a display (for example, a segment type display unit) provided with the detection information on the meter panel 30. The detection information is converted based on the control information so that the display form of D1a) is obtained.
For example, when the display control means C1b receives the water temperature (detection information), the display control means C1b converts the signal corresponding to the water temperature in the data frame DF into a voltage that is a display form of the water temperature pointer type display unit D3c of the meter panel 30. The converted voltage is output to the pointer type display unit D3c for water temperature.

  That is, the display control means C1b outputs the detection information output from the detection information output means 51 from the control information output means 53 when it is determined by the identification information determination means 53 that it is specified in the identification information. It is means for controlling the display so that the display form specified by the control information is obtained. The operations of the identification information determination unit C1a and the display control unit C1b in the first sub control unit C1 will be described in detail later.

The liquid crystal monitor 80 will be described with reference to FIG.
Similar to the meter panel 30, the liquid crystal monitor 80 includes a segment type display unit D1b having seven segments (segment group 72). In the segment type display unit D1b, three 7 segments are arranged in each of the upper and lower stages. One segment 75 composed of dots (.) Is arranged between the three seven segments in the lower stage.

The liquid crystal monitor 80 according to the present embodiment displays the PTO rotational speed (n / min) with three digits by three upper seven segments, and displays the vehicle speed (km / h) with three digits by three lower seven segments. .
Such a liquid crystal monitor 80 includes a second slave control unit C2. The second slave control unit C2 includes, for example, a CPU and the like, and includes an identification information determination unit C2a and a display control unit C2b.

  The identification information determination unit C2a is a unit that determines whether or not the liquid crystal monitor 80 is designated by the identification information output by the identification information output unit 53. The identification information determination unit C2a receives the identification information output from the detection information output unit 51, the identification information output unit 52, and the control information output unit 53 of the main ECU 50 via the CAN communication network N. Based on the identification information sent from the main ECU 50, the identification information determination unit C2a determines whether or not the liquid crystal monitor 80 displays data such as detection information and control information sent from the main ECU 50. Judgment is made to determine whether to accept data (detection information, control information).

When the identification information determination unit C2a determines that the data (detection information, control information) is received (received), the display control unit C2b displays the display information (for example, a segment type display unit) provided in the liquid crystal monitor 80. The detection information is converted based on the control information so that the display form of D1b) is obtained.
For example, when the display control unit C2b receives the PTO rotation number (detection information), the display unit C2b sends a signal corresponding to the PTO rotation number in the data frame DF to the segment group which is the display form of the segment type display unit D1b of the liquid crystal monitor 80. It converts into the lighting voltage for 72, and outputs the converted voltage to each segment group 72 in a predetermined position.

  In other words, the display control means C2b outputs the detection information output from the detection information output means 51 from the control information output means 53 when it is determined by the identification information determination means 53 that it is specified in the identification information. It is means for controlling the display so that the display form specified by the control information is obtained. The operations of the identification information determination unit C2a and the display control unit C2b in the second slave control unit C2 will be described in detail later.

  As described above, the main ECU 50 and the first and second slave control units transmit and receive data via the vehicle communication network N such as a CAN (Controller Area Network) communication network. The vehicle communication network may be anything as long as it can transmit and receive data between the main ECU and the first and second sub-control units. Even if it is FlexRay, it is another network. May be.

A series of flows for the meter panel 30 and the liquid crystal monitor 80 in the tractor 2 configured as described above to display the detection information detected by the sensor 40 will be described with reference to FIGS. Through the description of this flow, the operation of the first slave control unit C1 of the meter panel 30 and the operation of the second slave control unit C2 of the liquid crystal monitor 80 will also be described.
With reference to FIG. 4, the operation flow for the meter panel 30 to display the engine speed will be described.

In step S1, the crank position sensor 40a detects the rotational speed of the flywheel, and the detection information output means 51 converts the rotational speed of the flywheel into the engine rotational speed.
In step S2, the detection information output means 51 replaces the engine speed obtained in step S1 with an 8-bit signal conforming to the standard for CAN communication.
In step S3, the identification information output means 52 determines that the display device that displays the 8-bit engine speed obtained in step S2 is the meter panel 30. And the identification information output means 52 adds the 1st identification information which designates the meter panel 30 to the data frame DF which sends an engine speed in order to make the display object of an engine speed the meter panel 30. FIG. As a result, the engine speed and the meter panel 30 are associated with each other.

The first identification information output by the identification information output means 52 includes not only information for designating the display object of the engine speed on the meter panel 30 but also the engine speeds in a plurality of positions provided on the meter panel 30. Among the displays, information (display destination information) for displaying on the segment type display unit D1a and the pointer type display unit D3a for rotation is also included.
That is, the identification information output means 52 displays the engine speed on the meter panel 30 among the plurality of display devices (the meter panel 30 and the liquid crystal panel 80), and the segment type display unit D1a of the meter panel 30 and the rotating pointer type. The first identification information is output for display on the display unit D3a.

  Further, the control information output means 53 includes first control information for specifying (designating) a display form of how to display the engine speed on the segment type display unit D1a, and a pointer type display unit for rotation. The third control information for designating the display form of how to display the engine speed for D3a is added to the data frame DF for sending the engine speed. As a result, the engine speed is associated with each display mode.

In step S4, the main ECU 50 outputs the engine speed, the first control information, the third control information, and the first identification information associated with each other to the CAN communication network N.
In step S5, the identification information determination means C1a of the first slave control unit C1 includes the first identification information in the continuous data (data frame DF) output from the main ECU 50 and flowing to the CAN communication network N in step S4. It is determined whether or not.

If it is determined in step S6 that the first identification information is included in step S5, the display control means C1b displays the data associated with the first identification information, that is, the engine speed, the first control information, the first 3 Receive control information.
In step S7, when the display control means C1b receives the engine speed and the first control information, the display control means C1b converts the engine speed into the specification of the segment type display unit D1a and the converted engine speed is designated by the first control information. It is displayed on the segment type display unit D1a so as to have a display form (for example, right-justified with numbers).

In step S8, when the display control means C1b receives the engine speed and the third control information, the display control means C1b converts the engine speed into the specification of the rotating pointer type display unit D3a and converts the converted engine speed to the third control information. Is displayed on the rotating pointer type display unit D3a so as to be in the display form designated by.
By steps S7 and S8, the engine speed is displayed on both the segment type display unit D1a and the rotating pointer type display unit D3a.

In step S9, the identification information determination means C2a of the second slave control unit C2 in the liquid crystal monitor 80 includes the second identification information in the continuous data flowing through the CAN communication network N output from the main ECU 50 in step S4. Judge whether or not.
In step S10, since the second identification information is not included as a result of the determination in step S9, the identification information determination unit C2a does not receive the engine speed, the first control information, and the third control information.

With reference to FIG. 5, the operation flow for the meter panel 30 to display a warning of the remaining fuel level and a warning of the coolant temperature will be described.
In step S20, the fuel sensor 40c detects the remaining amount of fuel, and the water temperature sensor 40b detects the cooling water temperature.
In step S21, the detection information output means 51 determines whether the remaining fuel amount and the coolant temperature obtained in step S20 are values that require a warning.

In step S22, the detection information output means 51 determines that the remaining fuel amount and the cooling water temperature obtained in step S20 are values that require a warning, and outputs a fuel warning and a water temperature warning.
In step S23, the identification information output means 52 adds the first identification information to the data frame DF for transmitting the fuel warning. This associates the fuel warning with the meter panel 30. The identification information output means 52 also includes a display destination (single LED display unit D2) for displaying a fuel warning in the first identification information.

Further, the control information output means 53 provides the second control information for specifying the display form of how to display the fuel warning on the single LED display section D2 in the data frame DF for sending the fuel warning. Append. Thus, the fuel warning and the display form are associated with each other.
Similar to the fuel warning, the identification information output means 52 adds the display destination of the water temperature warning to the data frame DF for transmitting the water temperature warning to the first identification information, and the control information output means 53 displays the display information. The second control information designating the previous display form is added to the data frame DF.

The display form for displaying the fuel warning and the display form for displaying the water temperature warning may be, for example, the same type of single LED display unit D2, but may be different from each other. If they are different, the second control information output by the control information output means 53 is different.
In step S24, the main ECU 50 sends the fuel warning, the second control information, and the first identification information associated with each other, and the water temperature warning, the second control information, and the first identification information associated with each other to the CAN communication network N. Output to.

In step S25, the identification information determination unit C1a of the first slave control unit C1 determines whether or not the first identification information is included in the data output from the main ECU 50 in step S24.
If it is determined in step S26 that the first identification information is included in step S25, the fuel warning and the second control information associated with each other, the water temperature warning and the second control information associated with each other are received. To do.

In step S27, when the display control unit C1b receives the fuel warning and the second control information, the display control unit C1b converts the fuel warning into the specification (for example, voltage) of the fuel LED display unit D2a and the converted fuel warning. 2 Display on the fuel LED display unit D2a so that the display form (for example, blinking) specified by the control information.
In step S28, when the display control means C1b receives the water temperature warning and the second control information, the display control means C1b converts the water temperature warning into the specification (for example, voltage) of the water temperature LED display unit D2b and also converts the converted fuel warning. The water temperature LED display unit D2b is displayed so as to have a display form (for example, lighting) designated by the second control information.

In step S29, the identification information determination means C2a of the second slave control unit C2 in the liquid crystal monitor 80 includes the second identification information in the continuous data flowing in the CAN communication network N output from the main ECU 50 in step S24. Judge whether or not.
In step S30, since the second identification information is not included as a result of the determination in step S9, the identification information determination means C2a includes the fuel warning and the second control information associated therewith, the water temperature warning and the second warning information. The associated second control information is not received.

With reference to FIG. 6, the operation flow for the liquid crystal monitor 80 to display the vehicle speed and the PTO rotation speed will be described.
In step S40, the vehicle speed sensor 40d detects the vehicle speed of the tractor 2. The crank position sensor 40a detects the rotational speed of the flywheel, and the detection information output means 51 obtains the PTO rotational speed from the rotational speed of the flywheel.

In step S41, the detection information output means 51 replaces the vehicle speed and PTO rotational speed obtained in step S41 with an 8-bit signal conforming to the CAN communication standard. In step S42, the detection information output means 51 outputs the vehicle speed and PTO rotational speed obtained in step S40.
In step S43, the identification information output means 52 determines that the display device that displays the vehicle speed obtained in step S42 is the liquid crystal monitor 80, and adds the second identification information to the data frame DF that transmits the vehicle speed. As a result, the vehicle speed and the liquid crystal monitor 80 are associated with each other. Similarly, the identification information output means 52 determines that the display device that displays the PTO rotational speed obtained in step S42 is the liquid crystal monitor 80, and adds the second identification information to the data frame DF to send the PTO rotational speed. Thereby, the PTO rotation speed and the liquid crystal monitor 80 are associated with each other.

The second identification information includes a vehicle speed display destination (segment type display portion D1b) and a PTO rotation speed display destination (segment type display portion D1b).
The control information output means 53 adds the first control information on how to display the vehicle speed on the segment type display unit D1b to the data frame DF for sending the vehicle speed. Thereby, the vehicle speed and the display form are associated with each other. Further, the control information output means 53 adds the first control information on how to display the PTO rotational speed on the segment type display unit D1b to the data frame DF for sending the PTO rotational speed. As a result, the PTO rotation speed is associated with the display form.

In step S44, the main ECU 50 outputs the vehicle speed, the first control information, and the second identification information associated with each other, and the PTO rotation speed, the first control information, and the second identification information associated with each other to the CAN communication network N. To do.
In step S45, the identification information determination unit C2a of the second slave control unit C2 determines whether or not the second identification information is included in the continuous data flowing in the CAN communication network N output from the main ECU 50 in step S44. Judging.

If it is determined in step S46 that the second identification information is included in step S45, the vehicle speed and the first control information associated with each other, the PTO rotation speed and the first control information associated with each other are received.
In step S47, when the display control means C2b receives the vehicle speed and the first control information, the display control means C2b converts the vehicle speed into the specification (for example, voltage) of the segment type display unit D1b and displays the converted vehicle speed designated by the first control information. Specify the position to be displayed in the form.

For example, the display control means C2b converts a signal corresponding to the vehicle speed in the data frame DF into a lighting voltage for the segment group 72, which is a display form of the segment type display unit D1b of the liquid crystal monitor 80, and generates the first control information. Based on this, the data is output to each segment group 72 at the lower position of the liquid crystal monitor 80.
In step S48, when the display control means C2b receives the PTO rotation speed and the first control information, the display control means C2b converts the PTO rotation speed into the specification (for example, voltage) of the segment type display unit D1b and performs the first control on the converted PTO rotation speed. The display position is specified so that the display form specified by the information is obtained.

For example, the display control means C2b converts a signal corresponding to the PTO rotation speed in the data frame DF into a lighting voltage for the segment group 72 which is the display form of the segment type display unit D1b of the liquid crystal monitor 80, and performs the first control. Based on the information, the information is output to each segment group 72 at the upper position of the liquid crystal monitor 80.
In step S49, the identification information determination means C1a of the first slave control unit C1 in the meter panel 30 includes the first identification information in the continuous data flowing in the CAN communication network N output from the main ECU 50 in step S44. Judge whether or not.

In step S50, since the first identification information is not included as a result of the determination in step S49, the identification information determination means C1a is associated with the vehicle speed and the first control information associated therewith, the PTO rotation speed, and this. The first control information is not received.
The tractor 2 according to the present embodiment includes a main ECU (main control unit) arranged separately from the meter panel 30 and the liquid crystal monitor 80 (display device). The main ECU 50 includes detection information output means 51, identification information output means 52, and control information output means 53.

  According to this, the main ECU 50 to which the sensor 40 is connected can control the meter panel 30 and the liquid crystal monitor 80 (display device) using the first and second identification information and the first to third control information. it can. By adopting the configuration in which each sensor 40 is connected to the main ECU 50 in this manner, the configuration of the first slave control unit C1 of the meter panel 30 and the second slave control unit C2 of the liquid crystal monitor 80 can be simplified. Moreover, since the function (control information output means 53) which outputs the control information for displaying detection information on a display apparatus is incorporated in main ECU50, the structure of the sub control part of a display apparatus is simplified more. The Therefore, even if the type and specifications of the display device are changed, the display device can be easily operated only by changing the program of the main ECU 50.

For example, in the meter panel 50, the engine speed, fuel warning, water temperature warning, fuel display form, and water temperature display form are changed from the state shown in FIG. 7A to the state shown in FIG. 7B. In this case, in the present invention, it is only necessary to change the control program for realizing the control information output means 51.
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  In the embodiment described above, the detection information is mainly the engine speed, fuel, water temperature, vehicle speed, PTO speed, etc., but the detection information is not limited to this, and is detected by the sensor 40 provided in the tractor 2. Anything is acceptable.

2 Tractor 10 Traveling vehicle body 11 Engine 12 Transmission 13 Working device 14 Cabin 15 Driver's seat 16 Three-point link mechanism 17 PTO rotary shaft 20 Switch 30 Meter panel 40 Sensor 50 Main ECU
51 Detection information output means 52 Identification information output means 53 Control information output means 60 Engine ECU
70, 75 Liquid crystal segment 71a-71c Symbol display part 72-74 Segment group 76 Needle part 77 Gauge display part 80 Liquid crystal monitor 90 Shift valve C1 1st slave control part C1a, C2a Identification information determination means C2 2nd slave control part C1b, C2b Display control means D1 Segment type display unit D2 Single type LED display unit D3 Pointer type display unit

Claims (1)

A plurality of display devices capable of displaying a state detected by a detector, and detection in which the display device is connected via a vehicle communication network and the detector is connected and the state detected by the detector A main control unit for outputting information to the plurality of display devices,
Said main control unit includes an identification information output means for outputting identification information for identifying the display device for displaying the detection information, the detection information output means for outputting the detection information,
Each of the plurality of display devices includes a display for displaying the detection information and a sub control unit for operating the display, and when specified by the identification information output by the identification information output means, Display the detection information output by the detection information output means ,
The main control unit includes control information output means for outputting control information for designating a display form for the display of the detection information,
The slave control unit
Identification information determination means for determining whether or not it is specified by the identification information output by the identification information output means;
When it is determined by the identification information determination means that the identification information is designated, the display is controlled so that the detection information output by the detection information output means has a display form designated by the control information. working machine, wherein the display control means, that you have provided a to.