Display device

Abstract

To make a display device redundant.SOLUTION: A display device 100 includes a display monitor 60 which displays an operation state of a mixer drum 3 of a mixer truck 1, and a first lamp 61 and second lamp 62 which display the operation state of the mixer drum 3 with lighting modes thereof.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a display device.

Background Art

[0002] Patent Document 1 discloses a liquid crystal display provided in the cab of a mixer truck that performs display processing of an image or the like in response to notification information transmitted from a controller, a management server, or the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a failure occurs in a display device that displays the operating state of a mounted object on a special vehicle such as a mixer truck, the operator cannot appropriately grasp the operating state of the mounted object. Therefore, even though there is no problem with the mounted object itself, the work on the special vehicle may have to be interrupted. In order to address such a situation, redundancy for the display device of the special vehicle is required.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a display device capable of stably grasping the operating state of a mounted object on a special vehicle.

Means for Solving the Problems

[0008] Further, the present invention A display device mounted on a special vehicle, comprising a display monitor for displaying the operating state of the mounting on the special vehicle, and a display lamp for displaying the operating state of the mounting by its lighting mode, a controller that controls the operations of a display monitor and a display lamp andIt is provided with, and the controller is configured to be communicable with an ECU that controls a special vehicle. The display lamp is configured to be able to display a normal operating state indicating that the mounted object is operating normally, an abnormal occurrence state indicating that an abnormality has occurred in the operation of the mounted object, and a communication abnormality state indicating that a communication abnormality has occurred between the controller and the ECU, and is characterized by preferentially displaying in the order of the communication abnormality state, the abnormal occurrence state, and the normal operating state.

[0009] In this invention, since the priority of the communication abnormality state, which is difficult for the operator to grasp, is set high, the convenience of the display device is improved.

[0010] Also, the present invention A display device mounted on a special vehicle, comprising a display monitor for displaying the operating state of the mounting on the special vehicle, and a display lamp for displaying the operating state of the mounting by its lighting mode, A controller that controls the operation of a display monitor and a display lamp, and a temperature detection unit that measures the temperature of the controller is provided Well, when the temperature measured by the temperature detection unit is equal to or higher than a predetermined limit temperature, the controller executes high-temperature standby control to stop without starting the display monitor, and the display lamp is configured to be able to display that the high-temperature standby control is being executed.

[0011] In this invention, since the display lamp can grasp that the display monitor is not started by the high-temperature standby control, the operator can take appropriate measures for the temperature drop of the controller. For this reason, it becomes easy to quickly return from the high-temperature standby state, and the convenience of the display device is improved.

Effects of the Invention

[0014] According to the present invention, the operating state of the mounted object of the special vehicle can be stably grasped by the display device.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0016] Hereinafter, with reference to the drawings, a display device 100 according to an embodiment of the present invention will be described.

[0017] The display device 100 is mounted on a mixer truck 1 which is a special vehicle. First, the overall configuration of the mixer truck 1 will be described below.

[0018] As shown in FIG. 1, the mixer truck 1 transports mortar, ready-mixed concrete, etc. (hereinafter referred to as "fresh concrete") in a mixer drum 3 mounted on a gantry 2.

[0019] As shown in FIGS. 1 and 2, the mixer truck 1 includes a mixer drum 3 mounted on the gantry 2 and capable of loading fresh concrete, a mixer drum drive device 10 (hereinafter simply referred to as "drive device 10") for rotationally driving the mixer drum 3, an ECU 40 for controlling the drive of the mixer drum 3, an operating device 50 for manually operating the mixer drum 3, and a display device 100 provided in the cab C.

[0020] As shown in FIG. 1, the mixer drum 3 is a bottomed cylindrical container rotatably mounted on the gantry 2, and has an opening (not shown) at its rear end. The mixer drum 3 is mounted so that its rotation axis is inclined gradually higher from the front to the rear of the vehicle.

[0021] A hopper 4 is provided at the upper rear of the opening of the mixer drum 3. The raw concrete fed into the opening is guided to the opening by the hopper 4. A flow guide 5 and a chute 6 are provided at the lower rear of the opening of the mixer drum 3. The raw concrete discharged from the opening is guided to the chute 6 by the flow guide 5 and discharged in a predetermined direction by the chute 6.

[0022] As shown in Fig. 2, the mixer drum 3 is rotationally driven using the traveling engine 7 mounted on the mixer vehicle 1 as a drive source. The drive device 10 is driven by the rotation of the engine 7 and rotationally drives the mixer drum 3 by the fluid pressure of the working fluid.

[0023] The rotational motion of the crankshaft (not shown) in the engine 7 is transmitted to the drive device 10 by a power take-off mechanism 8 (PTO: Power take-off) for constantly extracting power from the engine 7 and a drive shaft (not shown) connecting the power take-off mechanism 8 and the drive device 10.

[0024] In the drive device 10, hydraulic oil is used as the working fluid. Note that in the drive device 10, other incompressible fluids may be used instead of hydraulic oil as the working fluid.

[0025] The drive device 10 includes a hydraulic pump 20 as a fluid pressure pump that is driven by the engine 7 to discharge the working fluid, a hydraulic motor 30 as a two-speed fluid pressure motor that is driven by the hydraulic pump 20 to rotationally drive the mixer drum 3, and an electromagnetic proportional valve 21 that controls the flow of the hydraulic oil supplied from the hydraulic pump 20 to the hydraulic motor 30. The drive device 10 can rotate the mixer drum 3 forward and backward and increase and decrease its speed.

[0026] The hydraulic pump 20 is rotationally driven by the power constantly extracted from the engine 7 via the power take-off mechanism 8. Therefore, the rotational speed of the hydraulic pump 20 is greatly affected by the change in the rotational speed of the engine 7 accompanying the driving state of the vehicle. Thus, in the mixer truck 1, the ECU 40 controls the rotational speed of the hydraulic motor 30 so that the mixer drum 3 assumes the target rotational state according to the rotational speed of the engine 7.

[0027] The hydraulic pump 20 is a swash plate type axial piston pump with variable capacity. The hydraulic oil discharged from the hydraulic pump 20 is supplied to the hydraulic motor 30, causing the hydraulic motor 30 to rotate. The rotation of the hydraulic motor 30 is transmitted to the mixer drum 3 via the speed reducer 9. The hydraulic pump 20 is controlled such that as the pump discharge pressure led to the actuator (not shown) increases due to the operation of the actuator, the pump discharge amount decreases against the tilting spring that biases the swash plate. The pump discharge pressure led to the actuator is adjusted by a load sensing valve (not shown). The load sensing valve adjusts the pump discharge pressure led to the actuator so that the differential pressure between the discharge pressure of the hydraulic pump 20 and the pressure (load pressure) supplied to the hydraulic motor 30 becomes a predetermined value.

[0028] When the mixer drum 3 is driven forward by the hydraulic pump 20, the fresh concrete in the mixer drum 3 is agitated. On the other hand, when the mixer drum 3 is driven in reverse by the hydraulic pump 20, the fresh concrete in the mixer drum 3 is discharged to the outside through the flow guide 5 and the chute 6 from the opening at the rear end.

[0029] The hydraulic motor 30 is a swash plate type axial piston motor with variable capacity. The hydraulic motor 30 is rotationally driven by receiving the supply of the hydraulic oil discharged from the hydraulic pump 20. The hydraulic motor 30 is provided with a solenoid valve (not shown) that receives a two-speed switching signal from the ECU 40 and adjusts the tilting angle of the swash plate (not shown). The capacity of the hydraulic motor 30 is switched in two stages between a small capacity for high-speed rotation (2-speed) and a large capacity for normal rotation (1-speed) when the solenoid valve is switched.

[0030] The hydraulic motor 30 is provided with a rotation sensor 30a as a rotation speed detector. The rotation sensor 30a detects the rotation direction and the rotation speed of its output shaft (not shown), and outputs a rotation direction signal and a rotation speed signal to the ECU 40.

[0031] A closed circuit L is provided between the hydraulic pump 20 and the hydraulic motor 30, and hydraulic oil circulates in this closed circuit L. An electromagnetic proportional valve 21 is provided in the closed circuit L. The electromagnetic proportional valve 21 has a pair of solenoids 21a, 21b, and controls the energization of the pair of solenoids 21a, 21b according to a control signal from the ECU 40, thereby controlling the flow of the hydraulic oil led from the hydraulic pump 20 to the hydraulic motor 30. By controlling the electromagnetic proportional valve 21 in this way, the rotation direction and the rotation speed of the hydraulic motor 30 are controlled.

[0032] The ECU 40 controls the drive device 10, and is composed of a microcomputer equipped with a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an I / O interface (Input / Output Interface), etc. The RAM stores data in the processing of the CPU, the ROM stores in advance the control program of the CPU, etc., and the I / O interface is used for input and output of information with the connected devices. The control of the drive device 10 is realized by operating the CPU, the RAM, etc. according to the program stored in the ROM.

[0033] The ECU 40 is provided, for example, in the cab C. When the engine 7 is started by an operator operating an ignition switch (not shown) in the cab C, ignition power is input to the ECU 40. Thereby, the ECU 40 is driven.

[0034] The ECU 40 controls the operation of the mixer drum 3 according to the operation input by the operation device 50, determines the traveling state of the mixer truck 1, and controls the permission and prohibition of the operation by the operation device 50 according to the traveling state (interlock control).

[0035] For example, the ECU 40 performs interlock control of the operating device 50 according to the vehicle speed of the mixer truck 1 acquired by the vehicle speed sensor 55 and the operating state of the parking brake (not shown) acquired from the parking brake switch 56. When the vehicle speed of the mixer truck 1 is zero and the parking brake is actuated, the mixer truck 1 is determined to be in a stopped state. In this case, the operation by the operating device 50 is permitted (the interlock is released). When the vehicle speed of the mixer truck 1 is zero and the parking brake is not actuated, the mixer truck 1 is placed in a running standby state. In this case, since it is assumed that the mixer truck 1 is in a temporary stop during running, the operation by the operating device 50 is prohibited. When the vehicle speed of the mixer truck 1 is greater than zero and the parking brake is not actuated, the mixer truck 1 is placed in a running state. In this case, the operation by the operating device 50 is prohibited.

[0036] Also, when it is determined that the mixer truck 1 is in a running state, an automatic stirring operation is performed in which the ECU 40 automatically rotates the mixer drum 3 forward to stir the fresh concrete. During the automatic stirring operation, the operating device 50 is under interlock, and the operation of the mixer drum 3 by the operating device 50 is disabled.

[0037] Further, the ECU 40 detects abnormalities occurring in the drive device 10 and the operating device 50. The detection of abnormalities is based on the presence or absence of signals of each component of the drive device 10 and the operating device 50 (for example, sensors such as solenoids 21a, 21b, rotation sensor 30a, etc., and each switch of the operating device 50 described later) that transmit and receive signals to and from the ECU 40, and abnormal current values of the signals. Since known techniques can be used for detecting abnormalities in the drive device 10 and the operating device 50, detailed description thereof is omitted in this specification. When the ECU 40 detects an abnormality, an error signal is transmitted to the controller 65 of the display device 100 described later.

[0038] The operating device 50 is provided, for example, one in the driver's cab and three at different positions behind the vehicle. Each operating device 50 has the same function, and in FIG. 2, only a single operating device 50 is illustrated.

[0039] The operating device 50 includes a knob-type operation switch 51 for switching the rotation direction and rotation speed of the mixer drum 3, a stirring release button 52 for stopping the automatic stirring of the mixer drum 3, and an emergency stop button 53 for emergently stopping the operation of the mixer drum 3.

[0040] The operation switch 51 is a circular dial-type (volume-type) operation means, and the rotation direction of the mixer drum 3 is switched according to its operation position. Also, the rotation speed of the mixer drum 3 is controlled according to the operation position of the operation switch 51.

[0041] The stirring release button 52 is a push-button type switch. When it is pressed during the above-described automatic stirring operation, the interlock for the operating device 50 is released, enabling the control of the mixer drum 3 by the operating device 50 during the travel of the mixer truck 1. Thereby, operations such as discharging fresh concrete during the travel of the mixer truck 1 become possible, for example.

[0042] The emergency stop button 53 is a push-button type switch. By pressing the emergency stop button 53, the rotation of the mixer drum 3 is stopped regardless of the working state of the mixer drum 3.

[0043] Next, with reference to FIGS. 2 to 5, the specific configuration of the display device 100 will be described.

[0044] The display device 100 displays the operating states of the mixer truck 1 and the mixer drum 3. As shown in FIGS. 2 and 3, the display device 100 includes a housing 101, a display monitor 60 for displaying the states of the mixer truck 1 and the mixer drum 3, a first lamp 61 and a second lamp 62 as a plurality of display lamps, and a controller 65 for controlling the operation of the display monitor 60, the first lamp 61, and the second lamp 62.

[0045] The display monitor 60 functions as an input unit that receives the operator's operation input and also functions as a display capable of displaying images, i.e., a so-called touch panel. As shown in FIG. 2, the display monitor 60 is attached to the front surface of the housing 101. By operating the display monitor 60, it is possible to switch the screen displayed on the display monitor 60, set the information to be displayed, etc. Note that the display monitor 60 is not limited to a touch panel, and any display capable of displaying at least images may be used. The display monitor 60 is switched between activation and deactivation by switching a power switch (not shown) provided on the housing 101.

[0046] The first lamp 61 and the second lamp 62 are each LED lamps and emit light in different colors. The first lamp 61 and the second lamp 62 are attached to the front surface of the housing 101, just like the display monitor 60. Note that the first lamp 61 and the second lamp 62 may emit light in the same color.

[0047] The controller 65 is composed of a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an I / O interface (Input / Output interface), etc. The RAM stores data in the processing of the CPU, the ROM stores in advance the control program of the CPU, etc., and the I / O interface is used for input / output of information with the connected devices. By operating the CPU, the RAM, etc. according to the program stored in the ROM, control of the display monitor 60, the first lamp 61, and the second lamp 62 is realized.

[0048] A small microcomputer housed inside the housing 101 is used for the controller 65. Similar to the ECU 40, the controller 65 is activated when the ignition switch is turned ON by the operator and ignition power is supplied. When the controller 65 is activated, the controller 65 executes an application stored in advance and executes a display process for causing the display monitor 60 to display information.

[0049] The controller 65 communicates with the ECU 40 and the operating device 50 at predetermined time intervals, either by wire or wirelessly. The controller 65 receives information indicating the running state of the mixer truck 1 and the operating state of the mixer drum 3 from the ECU 40. Further, the controller 65 receives operation signals of the operation switch 51, the agitation release button 52, and the emergency stop button 53 of the operating device 50 from the operating device 50. The controller 65 is configured to be able to display on the display monitor 60 information indicating the running state of the mixer truck 1, the operating state of the mixer drum 3, and the operating state of the operating device 50 according to the information received from the ECU 40 and the operating device 50.

[0050] The information indicating the running state of the mixer truck 1 includes information such as the stopped state, running state, and running standby state determined by the ECU 40. Further, the information indicating the operating state of the mixer drum 3 indicates the operation of the drive device 10 and includes information regarding the rotation direction (agitation rotation, discharge rotation, rotation stop), rotation speed, presence or absence of automatic agitation, and abnormalities occurring in the drive device 10 of the mixer drum 3. The information indicating the operating state of the operating device 50 includes the operation position of the operation switch 51 of the operating device 50, the ON-OFF of the agitation release button 52 and the emergency stop button 53, the presence or absence of the operation right of each operating device 50 (presence or absence of interlock), and information on abnormalities occurring in the operating device 50.

[0051] Further, the controller 65 controls the lighting modes of the first lamp 61 and the second lamp 62, and the first lamp 61 and the second lamp 62 also display information regarding the operating states of the mixer truck 1 and the mixer drum 3. The control of the lighting modes of the first lamp 61 and the second lamp 62 will be described in detail later.

[0052] The display device 100 further includes a temperature sensor 66 as a temperature detection unit that measures the temperature of the CPU of the controller 65. When the temperature inside the display device 100 rises, there is a possibility that the display monitor 60 may not be able to display information properly. If incorrect information is displayed on the display monitor 60, performing work based on the information on the display monitor 60 may cause work defects or accidents. Therefore, the controller 65 executes high-temperature standby control in which, when the temperature of the temperature sensor 66 becomes equal to or higher than a pre-stored limit temperature used as a threshold value, the display monitor 60 is not activated even if the power switch is ON. This suppresses the possibility of incorrect information being displayed on the display monitor 60.

[0053] Next, the control of the lighting modes of the first lamp 61 and the second lamp 62 will be described with reference to FIGS. 4 and 5.

[0054] As shown in FIG. 4, in the present embodiment, seven statuses are set as the statuses displayed by the first lamp 61 and the second lamp 62. The first lamp 61 and the second lamp 62 display seven statuses by combinations of lighting modes such as turning off, turning on, and blinking of each lamp. Note that blinking is a mode in which turning off and turning on are alternately executed.

[0055] The statuses displayed by the first lamp 61 and the second lamp 62 are roughly classified into a monitor stop state indicating a state in which the display monitor 60 is not activated, an operating state of the mixer vehicle 1 and the mixer drum 3, and an external operation state representing a state in which a specific operation input has been made by an operator.

[0056] The monitor stop state includes a stop state in which the power of the display monitor 60 is OFF and the display monitor 60 is not activated, and a high-temperature standby state in which the power is ON and the display monitor 60 is not activated because the temperature of the CPU of the controller 65 is equal to or higher than the limit temperature.

[0057] The operating state includes a normal operating state indicating that the mixer truck 1, the drive device 10, and the operating device 50 are operating normally, an abnormal occurrence state indicating that an abnormality has occurred in any of the mixer truck 1, the drive device 10, and the operating device 50 and they are not operating normally, and a communication abnormal state indicating that a communication abnormality has occurred between the ECU 40 and the controller 65.

[0058] The normal operating state is a state in which no error signal is input from the ECU 40 and the operating device 50 to the controller 65.

[0059] The abnormal occurrence state is, for example, a state in which the ECU 40 detects an abnormality in the solenoids 21a, 21b of the electromagnetic proportional valve 21 provided in the drive device 10, the battery of the mixer truck 1, or the operating device 50, and an error signal indicating that the abnormality has been detected is input from the ECU 40 to the controller 65.

[0060] The communication abnormal state is a state in which the communication regularly performed between the ECU 40 and the controller 65 at a predetermined interval is not executed.

[0061] The external operation state includes an emergency stop state indicating that the emergency stop button 53 of the operating device 50 is pressed, and an administrator mode state indicating that an application is being executed in the administrator mode by the operator's operation input. The administrator mode is a mode that is executed when, for example, an administrator is authenticated by performing a predetermined operation on a display monitor that is a touch panel, and is a mode in which settings of information displayed on the display monitor, settings of operations that an operator can perform, etc. can be changed.

[0062] The controller 65 assigns priorities to the seven states shown in FIG. 4 and causes them to be displayed on the first lamp 61 and the second lamp 62. In this embodiment, the larger the number indicated by "No" in FIG. 4, the higher the priority is set. When it corresponds to both a state with a high priority and a state with a low priority, the state with a high priority is preferentially displayed over the state with a low priority. Specifically, the priorities are set in descending order as the monitor stop state, the operating state, and the external operation state. Also, in the operating state, the abnormal occurrence state has a higher priority than the normal operating state, and the communication abnormal state has a higher priority than the abnormal occurrence state.

[0063] Next, with reference to the flowchart shown in FIG. 5, the lighting control of the first lamp 61 and the second lamp 62 by the controller 65 will be described.

[0064] When the ignition switch is turned ON, the controller 65 executes the processing shown in FIG. 5 at a predetermined control interval.

[0065] In step S10, it is determined whether the power button of the display monitor 60 is ON. If the power button is OFF, the process proceeds to step S11 and the status is set to the stop state (No. 1). If the power button is ON, the process proceeds to step S12.

[0066] In step S12, it is determined whether the CPU temperature of the controller 65 measured by the temperature sensor 66 is less than the limit temperature. If the CPU temperature is equal to or higher than the limit temperature, the controller 65 does not operate the display monitor 60. In this case, the process proceeds to step S13 and the status is set to the high-temperature standby state (No. 2). If the CPU temperature of the controller 65 is less than the limit temperature, the process proceeds to step S14 and the status is set to the normal operating state (No. 3). When the status is set in steps S11, S13, and S14, the process proceeds to step S15 and an application that executes display processing on the display monitor 60 is started.

[0067] Next, in steps S16 to S23, it is determined whether it corresponds to the remaining statuses (No. 4 to 7), and if it does, the status information is updated to the corresponding status.

[0068] First, in step S16, it is determined whether a predetermined operation is performed by the operator and the application is being executed in the administrator mode. If the application is being executed in the administrator mode, the process proceeds to step S17, and the status is set to the administrator mode state (No. 7). If the application is not being executed in the administrator mode, the process proceeds to step S18.

[0069] In step S18, it is determined whether the emergency stop button 53 is ON. If the emergency stop button 53 is ON, in step S19, the status is set to the emergency stop state (No. 6). If the emergency stop button 53 is not ON, the process proceeds to step S20.

[0070] In step S20, it is determined whether communication is being performed at a predetermined time interval between the ECU 40 and the controller 65. If communication is not being performed between the ECU 40 and the controller 65, in step S21, the status is set to the communication error state (No. 5). If the communication between the ECU 40 and the controller 65 is being performed normally, the process proceeds to step S22.

[0071] In step S22, it is determined whether the input data from the ECU 40 to the controller 65 contains an error signal. If an error signal is contained, in step S23, the status is set to the abnormality detection state (No. 4).

[0072] When the status is updated in steps S17, S19, S21, and S23, and when it is determined as NO in step S22, the process proceeds to step S24, and the first lamp 61 and the second lamp 62 are lit in a manner corresponding to the current status shown in FIG. 4. Note that when it is determined as NO in step S24, the first lamp 61 and the second lamp 62 are lit in a manner corresponding to the status set in any of steps S11, S13, and S14.

[0073] As described above, by executing the control shown in FIG. 5, the controller 65 controls the lighting modes of the first lamp 61 and the second lamp 62 according to the priorities of the statuses shown in FIG. 4. Thereby, even when appropriate information is not displayed on the display monitor 60 due to a failure or the like, the current operating states of the mixer vehicle 1 and the mixer drum 3 (drive device 10) can be grasped from the lighting modes of the first lamp 61 and the second lamp 62. Further, since the controller 65 controls the lighting modes of the first lamp 61 and the second lamp 62 according to the priorities shown in FIG. 4, the operator can appropriately grasp more important information.

[0074] According to the above embodiment, the following effects can be obtained.

[0075] In the display device 100, the normal operating state and the abnormal occurrence state as the operating state of the mixer drum 3 are displayed by the first lamp 61 and the second lamp 62. Therefore, even when the display monitor 60 cannot display information appropriately, the operator can appropriately grasp the state of the mixer drum 3 from the displays of the first lamp 61 and the second lamp 62. Accordingly, the operator can determine whether to continue or interrupt the work based on the displays of the first lamp 61 and the second lamp 62, and the work efficiency of the mixer vehicle 1 can be improved.

[0076] Also, generally, when an abnormality occurs in the operation of the mixer truck 1 or the mixer drum 3, an abnormal signal is detected by a sensor or the like, and in some cases, an operator may also detect the abnormality visually or the like. On the other hand, it is difficult for the operator to grasp the communication abnormality between the ECU 40 and the controller 65 by himself / herself. Therefore, in the display device 100, the communication abnormality state is displayed by the first lamp 61 and the second lamp 62 with priority over the abnormality occurrence state, so that information that is difficult to grasp can be left to the operator, improving convenience.

[0077] Also, in the display device 100, the stopped state where the display monitor 60 is stopped because the power is OFF and the high-temperature standby state where the display monitor 60 is stopped by high-temperature standby control are distinguished and displayed by the first lamp 61 and the second lamp 62. For this reason, if it is the high-temperature standby state, the operator can take appropriate measures due to the temperature drop of the controller 65, so it becomes easier to quickly return from the high-temperature standby state. Therefore, the convenience of the display device 100 is improved.

[0078] Also, in the display device 100, at least one of the first lamp 61 and the second lamp 62 is set to blink in the communication abnormality state (No. 5), the emergency stop state (No. 6), and the administrator mode state (No. 7) with relatively high priority. The blinking of the lamp repeats turning off and on, and since the appearance changes for the operator over time, it is easy for the operator to recognize. Therefore, by setting the blinking display mode for the state with relatively high priority, the operator can be quickly notified of the state.

[0079] Next, a modification example of this embodiment will be described. The following modification examples are also within the scope of the present invention, and it is also possible to combine the configurations shown in the modification examples with the configurations described in the above-described embodiment, or to combine the configurations described in the following different modification examples with each other.

[0080] In the above-described embodiment, the display device 100 has been described as being provided in the mixer truck 1 as a special vehicle. In contrast, the use of the display device 100 is not limited to the mixer truck 1, and it may be mounted on special vehicles other than the mixer truck 1, such as a packer truck (garbage truck), a dump truck, a ladder fire truck, a pruning and pulverizing truck, etc.

[0081] Also, in the above-described embodiment, the seven statuses shown in FIG. 4 have been described as the statuses displayed by the first lamp 61 and the second lamp 62, but these are merely examples and are not limited thereto. The first lamp 61 and the second lamp 62 only need to represent the operating state of the mixer drum 3 which is at least a mounted object, and the information to be displayed can be arbitrarily set. Further, the operating state of the mixer drum 3 represented by the first lamp 61 and the second lamp 62 only needs to include at least one of a normal operating state in which it is operating normally and an abnormal occurrence state in which an abnormality has occurred. Also, the priority of the status is not limited to the above description and can be arbitrarily set according to needs.

[0082] Also, in the above-described embodiment, the display device 100 includes two lamps, the first lamp 61 and the second lamp 62, but it is not limited thereto. The display device 100 may include three or more display lamps. By providing the display device 100 with a plurality of display lamps, it becomes easier to represent the operating state of the mixer drum 3 and the like, in addition to simply turning on and off the display monitor 60, depending on the lighting pattern.

[0083] Also, the display device 100 is not limited to having a plurality of display lamps, and may have a single display lamp. When the display device 100 has a single display lamp, it is desirable to set a plurality of blinking patterns (time intervals for repeating lighting) of the display lamp so that a plurality of states such as the operating state of the mixer drum 3 are displayed by the plurality of blinking patterns.

[0084] In the above embodiment, the first lamp 61 and the second lamp 62 are LED lamps that emit light in different colors. In contrast, the display lamp may be a white LED lamp including chips of three colors: red, green, and blue. When the display device 100 includes a single display lamp, by using a white LED lamp as the display lamp, even a single light source can express a plurality of colors, so that a plurality of operating states of the mixing drum 3 can be expressed, which is particularly effective.

[0085] Further, in addition to the first lamp 61 and the second lamp 62, the display device 100 may include a speaker that notifies an operator of information by sound. In this case, the first lamp 61 and the second lamp 62 and the speaker may notify information of the same content, or may notify different information from each other.

[0086] Hereinafter, the configuration, operation, and effects of the embodiments of the present invention will be collectively described.

[0087] The display device 100 mounted on the mixer truck 1 includes a display monitor 60 that displays the operating state of the mixer drum 3 of the mixer truck 1, and a first lamp 61 and a second lamp 62 that display the operating state of the mixer drum 3 by their lighting modes.

[0088] In this configuration, even when the display monitor 60 cannot appropriately display information, the operating state of the mixer drum 3 can be grasped by the first lamp 61 and the second lamp 62. Therefore, the operating state of the mixer drum 3 of the mixer truck 1 can be stably grasped by the display device 100.

[0089] In addition, the display device 100 includes a controller 65 that controls the operations of the display monitor 60, the first lamp 61, and the second lamp 62. The controller 65 is configured to be communicable with the ECU 40 that controls the mixer truck 1. The first lamp 61 and the second lamp 62 are configured to be able to display a normal operation state indicating that the mixer drum 3 is operating normally, an abnormal occurrence state indicating that an abnormality has occurred in the operation of the mixer drum 3, and a communication abnormality state indicating that a communication abnormality has occurred between the controller 65 and the ECU 40, and they display in order of priority with the communication abnormality state, the abnormal occurrence state, and the normal operation state.

[0090] In this configuration, since the priority of the communication abnormality state, which is difficult for the operator to grasp, is set high, the convenience of the display device 100 is improved.

[0091] In addition, the display device 100 further includes a temperature sensor 66 detection unit that measures the temperature of the controller 65. When the temperature measured by the temperature sensor 66 is equal to or higher than a predetermined limit temperature, the controller 65 executes high-temperature standby control to stop without starting the display monitor 60. The first lamp 61 and the second lamp 62 are configured to be able to display that the high-temperature standby control is being executed.

[0092] In this configuration, since the first lamp 61 and the second lamp 62 can indicate that the display monitor 60 is not started due to the high-temperature standby control, the operator can take appropriate measures for the temperature drop of the controller 65. Therefore, it becomes easier to quickly return from the high-temperature standby state, and the convenience of the display device 100 is improved.

[0093] In addition, in the display device 100, the lighting modes of the first lamp 61 and the second lamp 62 are characterized by including turning off, lighting, and blinking.

[0094] In this configuration, since the difference in the lighting modes of the first lamp 61 and the second lamp 62 is visually easy to distinguish, it becomes easier for the operator to grasp the operation state of the vehicle's mounting.

[0095] The embodiments of the present invention have been described above. However, the above embodiments merely show some application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

Explanation of Reference Numerals

[0096] 100... display device, 1... mixer truck (special vehicle), 3... mixer drum (mounted object), 40... ECU, 50... operating device, 60... display monitor, 61... first lamp (display lamp), 62... second lamp (display lamp), 65... controller, 66... temperature sensor (temperature detection unit)

Claims

1. A display device mounted on a special equipment vehicle, a display monitor for displaying the operating state of the mounted equipment of the special equipment vehicle, a display lamp for displaying the operating state of the mounted equipment by its lighting mode, and a controller for controlling the operations of the display monitor and the display lamp, wherein the controller is configured to be communicable with an ECU that controls the special equipment vehicle, the display lamp, a normal operating state indicating that the mounted equipment is operating normally, an abnormal occurrence state indicating that an abnormality has occurred in the operation of the mounted equipment, and a communication abnormal state indicating that a communication abnormality has occurred between the controller and the ECU, and is configured to be able to display them, and is characterized in that it preferentially displays them in the order of the communication abnormal state, the abnormal occurrence state, and the normal operating state.

2. A display device mounted on a special equipment vehicle, a display monitor for displaying the operating state of the mounted equipment of the special equipment vehicle, a display lamp for displaying the operating state of the mounted equipment by its lighting mode, a controller for controlling the operations of the display monitor and the display lamp, and a temperature detection unit for measuring the temperature of the controller, wherein when the temperature measured by the temperature detection unit is equal to or higher than a predetermined limit temperature, the controller executes a high-temperature standby control to stop the display monitor without starting it, and the display lamp is configured to be able to display that the high-temperature standby control is being executed.

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