JP2017149314A - Display device for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display information related to a motor generator, in addition to information related to an engine, without size increase of a display device, cost increase and reduction of visibility of display information.SOLUTION: A display device for a work vehicle comprises: a liquid crystal display device 31 having plural display parts 31A-31F for displaying information related to an engine in segment display; and a display electronic control unit for controlling operation of the liquid crystal display device 31. The liquid crystal display device 31 comprises an auxiliary display part 31G for displaying information related to a motor generator on an empty region thereof. The auxiliary display part 31G comprises a display portion for four digits in 7 segment display. The display electronic control unit comprises a control part for the auxiliary display part which operates the display portion on a first digit of the auxiliary display part 31G, as a first display portion 31Ga for displaying a state of the motor generator by characters, and operates the residual display portion for three digits, as a second display portion 31Gb for displaying a residual quantity of a battery by numerical values.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a display device for a work vehicle including a liquid crystal display having a plurality of display units for displaying information related to an engine, and a display electronic control unit for controlling the operation of the liquid crystal display.

  As a display device for a work vehicle as described above, an engine speed display area for displaying the engine speed, an hour meter display area for displaying the accumulated operating time of the engine, a temperature of engine cooling water, on a liquid crystal display of about 4 inches There are a plurality of display units for displaying information related to the engine, such as a water temperature meter region for displaying the fuel and a fuel meter region for displaying the remaining amount of fuel supplied to the engine (see, for example, Patent Document 1). .

JP 2013-252747 A (paragraph numbers 0020, 0041, 0042, FIG. 6, FIG. 11)

  In recent work vehicles, a hybrid work vehicle including a motor generator in addition to an engine has been developed as a power source. In such a hybrid work vehicle, display information displayed by the display device needs to display information related to the motor generator in addition to information related to the engine. To that end, it is conceivable to increase the size of the liquid crystal display in accordance with the increase in the amount of information to be displayed. In this case, however, the size of the display device is increased and the cost is greatly increased by increasing the size of the liquid crystal display. It will cause a rise. In addition, although it is conceivable to reduce the size of each display unit in accordance with an increase in the amount of information to be displayed, in this case, the visibility of information displayed on each display unit of the liquid crystal display is reduced. It will be.

  In other words, the development of a display device that can display information related to the motor generator in addition to information related to the engine without causing an increase in the size of the display device, a significant increase in cost, or a reduction in the visibility of the display information. It is desired.

As means for solving the above problems, a display device for a work vehicle
A liquid crystal display having a plurality of display units for segmentally displaying information on the engine, and a display electronic control unit for controlling the operation of the liquid crystal display;
The liquid crystal display includes an auxiliary display unit that displays information about the motor generator in an empty area of the display area,
The auxiliary display unit has a 7-segment display and a 4-digit display part,
The display electronic control unit operates the display part of the first digit or the fourth digit in the auxiliary display unit as a first display part for displaying the state of the motor generator, and the remaining three digits. A control unit for an auxiliary display unit that operates the display part as a second display part that numerically displays the remaining amount of the battery is provided.

According to this means, the cost can be reduced as compared with the case where a dot matrix type liquid crystal display is provided.
In addition, a space-saving, inexpensive 7-segment display and an auxiliary display unit having a 4-digit display part are additionally provided in the empty area of the liquid crystal display, so that the size of the liquid crystal display is not increased. Information relating to the motor generator can be additionally displayed without reducing the size of each display unit.
With regard to the display on the auxiliary display unit, if the motor generator is in the power running state, for example, the first display part (the first or fourth digit display part) of the auxiliary display unit is controlled by the control operation of the control unit. ), It is possible to notify the driver that the current state of the motor generator is the power running state by setting “P” which is an acronym of “Power” which is easily associated with the power running state. it can.
If the state of the motor generator is in the regenerative state, “C”, which is an acronym for “Charge” that is easily associated with the regenerative state, for example, in the first display portion of the auxiliary display unit by the control operation of the control unit. If the setting is made so that is displayed, the driver can be informed that the current state of the motor generator is in the regenerative state.
Further, if the state of the motor generator is neither the power running state nor the regenerative state, the control operation of the control unit, for example, if nothing is displayed on the first display part of the auxiliary display unit, The driver can be informed that the state of the motor generator is neither the power running state nor the regenerative state.
Then, by setting the control unit so that the remaining amount of the battery is displayed as a percentage in the second display portion (the remaining three-digit display portion) of the auxiliary display unit, for example, the remaining amount of the battery Can be notified to the driver.
As a result, an inexpensive segment method is adopted for the liquid crystal display, and a space-saving and inexpensive auxiliary display section is additionally provided in the empty area of the liquid crystal display, thereby increasing the size and cost of the display device. In addition to the information about the engine, the state of the motor generator and the remaining amount of the battery can be suitably displayed in a state that is easy for the driver to visually recognize without causing an increase.

As one of the means for making the present invention more suitable,
The control unit performs blinking control based on the power level of the motor generator to shorten the blinking interval of the first display portion as the power level is higher.

According to this means, for example, if the state of the motor generator is the power running state, the higher the power level in the power running state, the shorter the blinking interval of “P” displayed in the first display portion, and the blinking operation. Get faster. Conversely, as the power level in the power running state decreases, the blinking interval of “P” displayed on the first display portion becomes longer and the blinking operation becomes slower. Thereby, it is possible to notify the driver of the power level of the motor generator in the power running state.
For example, if the state of the motor generator is in the regenerative state, the higher the power level in the regenerative state, the shorter the blinking interval of “C” displayed on the first display part and the faster the blinking operation. Conversely, the lower the power level in the regenerative state, the longer the blinking interval of “C” displayed on the first display portion, and the slower the blinking operation. As a result, the driver can be informed of the power level in the regenerative state of the motor generator.
As a result, it is possible to display the power level of the motor generator in the power running state and the regenerative state in a state where the driver can easily recognize without adding a new display unit.

As one of the means for making the present invention more suitable,
The control unit is configured to display a display state of the auxiliary display unit based on information from an in-vehicle main electronic control unit, a standard information display state that displays the state of the motor generator and the remaining battery level, and the motor generator. Display switching control is performed to switch between an abnormality information display state that displays an abnormality in the electric system including the maintenance information display state that displays information necessary for maintenance of the electric system.

According to this means, when the control unit detects an abnormality such as a motor generator or a battery based on information from the main electronic control unit, the display state of the auxiliary display unit is displayed from the standard information display state to the abnormality information display. Switch to state. In the abnormal information display state, for example, the auxiliary display unit generates an abbreviation “Error” such as “Er01” and a two-digit error code corresponding to the abnormal content at that time by the control operation of the control unit. If it is set to be displayed, it is possible to inform the driver that an abnormality has occurred in the electric system and the details of the abnormality at that time.
Further, the control unit performs switching operation from the normal operation mode to the maintenance mode for performing maintenance on the electric system such as the motor generator or the battery on the vehicle body side based on the information from the main electronic control unit. When this is detected, the display state of the auxiliary display unit is switched from the standard information display state to the maintenance information display state. Then, in the maintenance information display state, by setting the sensor identifier such as “Sa03” and the AD value to be displayed on the auxiliary display unit by the control operation of the control unit, for example, during maintenance of the electric system Necessary information can be notified to the driver.
As a result, it is possible to appropriately inform the driver of an abnormality in the electric system and information required for maintenance without additionally installing a new display unit.

As one of the means for making the present invention more suitable,
The liquid crystal display is arranged in a part that is laterally removed from an area where the driver's view is blocked by the steering wheel in the dashboard,
The auxiliary display unit is disposed at an end of the liquid crystal display on the steering wheel side.

According to this means, various information displayed on the liquid crystal display can be easily viewed by the driver without being obstructed by the steering wheel.
Then, the auxiliary display unit is positioned at the driver side in the liquid crystal display, so that the auxiliary display unit is provided with a space-saving auxiliary display unit in an empty area of the liquid crystal display. Information on the electric system displayed on the display unit can be easily seen by the driver.

As one of the means for making the present invention more suitable,
The auxiliary display unit includes a battery symbol indicating the battery,
The control unit executes symbol blinking control for blinking the battery symbol when the remaining amount of the battery falls below a set value.

  According to this means, it is possible to notify the driver that the remaining amount of the battery has fallen below the set value simply by additionally providing a battery symbol in the auxiliary display section.

As one of the means for making the present invention more suitable,
As the set value, a first set value and a second set value lower than the first set value are set,
In the symbol flashing control, the control unit determines the flashing interval of the battery symbol when the remaining amount of the battery falls below the second set value, and the remaining amount of the battery falls below the first set value. Make it shorter than the case.

According to this means, it is possible to notify the driver of the battery depletion in two stages only by setting the first set value and the second set value as set values.
As a result, the driver can be notified more clearly of the battery level.

As one of the means for making the present invention more suitable,
The in-vehicle main electronic control unit includes an electric mode in which a traveling device is driven only by power from the motor generator as a driving mode for traveling,
The liquid crystal display includes a rotation speed display section that has a 4-segment display portion in a 7-segment display and displays the engine rotation speed numerically.
The display electronic control unit includes a display switching unit that switches a display state of the rotation speed display unit,
When the electric mode is selected, the display switching unit displays the display state of the rotational speed display unit from the standard display state that displays the engine rotational speed to the character display that is the electric mode. When the selection of the electric mode is canceled, the display state of the rotation speed display unit is switched from the auxiliary display state to the standard display state.

According to this means, while the electric mode is selected, the display state of the rotation speed display unit becomes the auxiliary display state. In the auxiliary display state, by the control operation of the display switching unit, for example, in the rotation speed display unit, the abbreviation “ELEC”, which is an abbreviation of “ELECTRIC”, which is easily associated with the electric mode, or “battery” If the setting is made so that a certain “batt” is displayed, the driver can be informed that the current driving mode for traveling is the electric mode.
In addition, when the selection of the electric mode is cancelled, the display state of the rotation speed display unit becomes the standard display state. In the standard display state, the control operation of the display switching unit displays the numerical value of the engine rotational speed on the rotational speed display unit, thereby informing the driver that the current driving mode for traveling is not the electric mode. I can inform you.
In other words, by effectively using the rotation speed display portion that is unnecessary in the electric mode, it is possible to notify the driver whether or not the driving mode for driving is the electric mode without adding a new display portion. .

As one of the means for making the present invention more suitable,
A water temperature symbol indicating the temperature of the engine cooling water and a cell temperature symbol indicating the temperature of the battery cell are provided in adjacent locations of the temperature display unit, and an oil supply symbol indicating fuel supply, and a charge symbol indicating charging, Deployed adjacent to the remaining amount display area,
The display electronic control unit includes a symbol switching unit that switches a symbol to be displayed.
The symbol switching unit displays the water temperature symbol and the refueling symbol without displaying the cell temperature symbol and the charging symbol in a vehicle-mounted state in which information on the engine can be acquired, and the engine In a vehicle-mounted state in which acquisition of information regarding this is impossible, the cell temperature symbol and the charging symbol are displayed without displaying the water temperature symbol and the fueling symbol.

According to this means, when the work vehicle includes only the engine as its power source, or includes an engine and a motor generator, for example, since the vehicle is in a vehicle-mounted state in which information on the engine can be acquired, the symbol The switching unit displays the water temperature symbol and the fueling symbol without displaying the cell temperature symbol and the charging symbol. Accordingly, the display information on the temperature display unit is the temperature of the engine coolant, and the driver can be notified that the display information on the remaining amount display unit is the remaining amount of fuel. In addition, the remaining amount of fuel can be notified to the driver.
In addition, when the work vehicle includes only an electric motor or a motor generator as its power source, for example, since it is an in-vehicle state in which information on the engine cannot be acquired, the symbol switching unit includes a water temperature symbol and a fueling symbol. The cell temperature symbol and the charge symbol are displayed without displaying. Thereby, the display information of the temperature display unit is the temperature of the battery cell, and the driver can be notified that the display information of the remaining amount display unit is the remaining amount of the battery, the temperature of the battery cell, and The driver can be informed of the remaining battery level.
That is, a single display device can be configured to have a dual-purpose specification that can be mounted on an engine specification work vehicle, a hybrid specification work vehicle, and an EV specification work vehicle.
As a result, compared to the case where a dedicated display device corresponding to each specification is mounted on a work vehicle having different specifications, it can be advantageous in terms of cost and parts management.

It is a left view of a multipurpose work vehicle. It is a top view of a multipurpose work vehicle. It is a rear view of the boarding part which shows arrangement | positioning, such as a display apparatus and a transmission lever. It is a block diagram which shows a part of control structure of a multipurpose work vehicle. It is a front view of a display apparatus. It is a front view of the principal part of the liquid crystal display part which shows the display state of the auxiliary | assistant display part in a power running state. It is a front view of the principal part of the liquid crystal display part which shows the display state of the auxiliary | assistant display part in a regeneration state. It is a front view of the principal part of the liquid crystal display part which shows the display state of the auxiliary | assistant display part in the state which is neither a power running state nor a regeneration state. It is a front view of the principal part of the liquid crystal display part which shows the abnormal information display state of an auxiliary | assistant display part. It is a front view of the principal part of the liquid crystal display part which shows the maintenance information display state of an auxiliary | assistant display part. It is a front view of the principal part of the liquid crystal display part which shows the standard display state of a rotation speed display part. It is a front view of the principal part of the liquid crystal display part which shows the auxiliary | assistant display state of a rotation speed display part. It is a front view of the principal part of the liquid crystal display part which shows the distance display state of an integrated display part. It is a front view of the principal part of the liquid crystal display part which shows the time display state of an integral display part. In another embodiment, it is a front view of the principal part of the liquid crystal display part which shows the state in which the temperature display part displays the temperature of engine cooling water, and the remaining amount display part displays the remaining amount of fuel. It is a front view of the principal part of the liquid crystal display part which shows the state in which the temperature display part displays the temperature of a battery cell in another embodiment, and the residual amount display part is displaying the residual amount of a battery.

  Hereinafter, an embodiment in which a display device for a work vehicle according to the present invention is applied to a multi-purpose work vehicle of a parallel hybrid specification which is an example of a work vehicle will be described with reference to the drawings as an example for carrying out the present invention. .

The direction indicated by the arrow F in FIG. 1 is the front side of the multipurpose work vehicle, and the direction indicated by the arrow U is the upper side of the multipurpose work vehicle.
Further, the direction indicated by the arrow F shown in FIG. 2 is the front side of the multipurpose work vehicle, and the direction indicated by the arrow R is the right side of the multipurpose work vehicle.

  As shown in FIGS. 1 and 2, a multipurpose work vehicle exemplified in this embodiment includes a body frame 1 that forms a framework of a vehicle body, and a gasoline engine (hereinafter referred to as an engine) disposed as a power source at the front and rear center sides of the vehicle body. 2), a motor generator 3, a two-seater riding section 4 disposed on the front and rear center side of the vehicle body, a fuel tank 5 disposed on the right side of the vehicle body, left and right front wheels 6A, and left and right rear wheels 6B. The wheel-type traveling device 6 has a load carrier 7 connected to the rear portion of the vehicle body so as to be able to move up and down, and a swingable bonnet 8. The engine 2 and the motor generator 3 are interlocked and connected to each other via an electromagnetic clutch (not shown) or the like.

  The power from the power source is transmitted to the gear type transmission 11 through the centrifugal clutch 9 and the belt type continuously variable transmission 10. Then, the power for driving the front wheels taken out from the gear type transmission 11 is transferred to the left and right front wheels 6A via the first transmission shaft 12, the front wheel differential device 13, the left and right second transmission shafts 14, and the like. Communicated. Further, the power for driving the front wheels taken out from the gear type transmission 11 is transmitted to the left and right rear wheels 6B via the left and right third transmission shafts 15 and the like.

  Although not shown, the gear-type transmission 11 includes a transmission mechanism, a rear wheel differential mechanism, left and right brakes, and the like in its casing. The speed change mechanism switches the power from the power source to forward power and reverse power, and switches the forward power to high and low two stages.

  As shown in FIGS. 1 to 3, the riding section 4 includes a driver seat 16 disposed on the left side, a passenger seat 17 disposed on the right side, a steering wheel 18 for steering the front wheels disposed in front of the driver seat 16, and steering. A front-rear rocking shift lever 19 disposed adjacent to the right side of the wheel 18, a display device 20 for displaying various information, a left and right door 21, a protective frame 22, and the like are provided. The shift lever 19 includes a neutral position N, a low speed forward position L on the front side of the vehicle body relative to the neutral position N, a high speed forward position H on the front side of the vehicle body relative to the low speed forward position L, and a reverse position R on the rear side of the vehicle body relative to the neutral position N. , And can be switched and held. The transmission lever 19 is operatively linked to the transmission mechanism via a control cable (not shown).

  As shown in FIGS. 1, 2, and 4, this multipurpose work vehicle includes an in-vehicle main electronic control unit (hereinafter referred to as a main ECU) 23, and a battery 24 that is charged with electric power from the motor generator 3, It has.

  The main ECU 23 is configured by a microcomputer including a CPU, an EEPROM, and the like. The main ECU 23 is connected to in-vehicle electrical components such as the motor generator 3 and the display device 20 via in-vehicle communication such as CAN (Controller Area Network) or a power line so as to be communicable or capable of transmitting power. The battery 24 is a lithium ion battery connected to each electrical component such as the motor generator 3 and the main ECU 23 via the converter unit 25 or the like. The battery 24 includes a management system that monitors the voltage, current, temperature, and the like, and performs a charge / discharge restriction or protection of the battery 24 by stopping when an abnormality is detected. The motor generator 3 functions as a traveling motor with the electric power supplied from the battery 24 to compensate for the output shortage of the engine 2 at the time of high load work or starting. Further, the motor generator 3 functions as a generator with the power from the engine 2, thereby supplying electric power obtained from the engine power to the battery 24. The converter unit 25 includes an inverter, an AC-DC converter, a DC-DC converter, and the like.

  As shown in FIGS. 3 and 4, this multi-purpose work vehicle includes a key switch 26 that intermittently energizes each electrical component such as the main ECU 23. The key switch 26 can be switched between an “OFF” position, an “ON” position, and a “START” position, and can be held between the “OFF” position and the “ON” position. It is urged to return to the “ON” position. When the key switch 26 is manually operated to the “OFF” position, the key switch 26 is switched to a cut-off state in which the power supply from the battery 24 to each electrical component is cut off. When the key switch 26 is artificially operated to the “ON” position, the key switch 26 is switched to a connection state in which each electrical component is energized from the battery 24. When the key switch 26 is manually operated to the “START” position, the key switch 26 commands the main ECU 23 to start the engine 2 while maintaining the connection state.

  Although not shown, the main ECU 23 transmits an engine start command from the key switch 26 to an engine electronic control unit (hereinafter referred to as an engine ECU). The engine ECU starts the engine 2 by operating a starter motor or the like based on the engine start command. The engine ECU is configured by a microcomputer including a CPU, an EEPROM, and the like.

  As shown in FIGS. 3 and 4, the main ECU 23 includes a main control unit 23A that controls the operation of the motor generator 3 and the electromagnetic clutch, a determination unit 23B that determines the operation position of the key switch 26, and a driving for driving. A drive switching unit 23C for switching modes is provided. The main ECU 23 has, as driving modes for traveling, an electric mode in which the traveling device 6 is driven only by power from the motor generator 3, an engine driving mode in which the traveling device 6 is driven only by power from the engine 2, and the motor generator 3. And a hybrid drive mode for driving the traveling device 6 using both the power from the engine 2 and the power from the engine 2.

The drive switching unit 23C switches the driving mode for traveling to the electric mode when detecting the switching of the key switch 26 from the “OFF” position to the “ON” position based on the information from the determination unit 23B.
When the drive switching unit 23C detects the switching of the key switch 26 from the “ON” position to the “START” position based on the information from the determination unit 23B, the drive switch selection switch 27 provided in the riding unit 4 is selected. Switch to the drive mode selected by manual operation. The selection switch 27 can be switched between a first state in which the engine drive mode is selected and a second state in which the hybrid drive mode is selected. The drive switching unit 23C switches the travel drive mode to the engine drive mode when the selection switch 27 is in the first state. When the selection switch 27 is in the second state, the drive switching unit 23C switches the travel drive mode to the hybrid drive mode.
Accordingly, the driver can select the electric mode as the driving mode for traveling by operating the key switch 26 from the “OFF” position to the “ON” position, and the vehicle body can be operated without operating the engine 2. It can be run. Then, in a state where the engine 2 is operated by operating the key switch 26 from the “ON” position to the “START” position, the driver operates the selection switch 27 to change the driving mode for traveling to the engine driving mode. It is possible to switch to the driving mode.

  In the electric mode, the main control unit 23A switches the electromagnetic clutch to the disengaged state, disengages the linkage between the engine 2 and the motor generator 3, and uses the motor generator 3 as a travel motor. The main control unit 23A controls the operation of the inverter of the converter unit 25 based on the output of the pedal sensor 29 that detects the depression operation amount of the accelerator pedal 28 provided in the riding unit 4. The inverter outputs a drive control current (for example, a PWM signal) according to the depression operation amount of the accelerator pedal 28 to the motor generator 3 based on the control operation of the main control unit 23A. The operating state of the speed change mechanism is switched according to the operation position of the speed change lever 19.

  In the engine drive mode, the main control unit 23A switches the electromagnetic clutch to the connected state, and uses the motor generator 3 as a generator that generates power with the power from the engine 2. The main control unit 23A transmits the output of the pedal sensor 29 to the engine ECU. The engine ECU controls the output rotation speed of the engine 2 based on the output of the pedal sensor 29 and the output of the rotation sensor 30 that detects the output rotation speed of the engine 2. The operating state of the speed change mechanism is switched according to the operation position of the speed change lever 19.

  In the hybrid drive mode, the main controller 23A transmits the output of the pedal sensor 29 to the engine ECU, and the inverter of the electromagnetic clutch and converter unit 25 based on the output of the pedal sensor 29, the hybrid control program, and the like. Control the operation of. The engine ECU controls the output rotational speed of the engine 2 based on the output of the pedal sensor 29 and the output of the rotation sensor 30. The inverter outputs a drive control current (for example, a PWM signal) corresponding to the required assist force to the motor generator 3 based on the output of the pedal sensor 29 and the control program for hybrid. The operating state of the speed change mechanism is switched according to the operation position of the speed change lever 19.

  That is, the driver can perform forward / reverse switching and switching between two levels of forward and backward driving power by operating the speed change lever 19 regardless of switching of the driving mode for traveling, and the accelerator pedal 28. The vehicle speed can be adjusted by depressing the vehicle.

  As the pedal sensor 29, a rotary potentiometer or the like can be employed. As the rotation sensor 30, an electromagnetic pickup type or the like can be adopted.

As shown in FIGS. 3 to 5, the display device 20 includes a liquid crystal display 31 having a plurality of display units for segmentally displaying information about the engine 2, a lamp unit 32 having various warning lamps composed of light emitting diodes, and the like, A display electronic control unit (hereinafter referred to as a display ECU) 33 for controlling the operation of the liquid crystal display 31 and the lamp unit 32 is provided.
In other words, the display device 20 includes the segment type liquid crystal display 31, thereby reducing the cost compared to the case where the display device 20 includes the dot matrix type liquid crystal display.

  As shown in FIG. 5, the liquid crystal display 31 includes a vehicle speed display unit 31 </ b> A that displays the vehicle speed, a shift display unit 31 </ b> B that displays the operation position of the shift lever 19, an accumulated travel distance or an accumulated engine operating time as a plurality of display units. A display unit 31C for displaying the engine speed, a display unit 31D for displaying the engine speed, a temperature display unit 31E for displaying the temperature of the engine cooling water, and a remaining amount display unit 31F for displaying the remaining amount of fuel. ing. The vehicle speed display unit 31 </ b> A has a 7-segment display and a 2-digit display part, and is disposed at a central position in the liquid crystal display 31. The speed change display unit 31B has a 14-segment display and a one-digit display part, and is disposed at a position on the left side of the vehicle speed display unit 31A in the liquid crystal display 31. The integrated display unit 31C has a 7-segment display and a 6-digit display part, and is arranged at a position above the vehicle speed display unit 31A in the liquid crystal display 31. The rotation speed display unit 31D has a 7-segment display and a 4-digit display part, and is disposed at a position below the vehicle speed display unit 31A in the liquid crystal display 31. The temperature display unit 31E includes a seven-segment display part for displaying a bar graph, and is disposed at a position on the right side of the vehicle speed display unit 31A and the integration display unit 31C in the liquid crystal display 31. The remaining amount display unit 31F includes a 7-segment display portion for displaying a bar graph, and is disposed at a position on the right side of the vehicle speed display unit 31A and the rotation speed display unit 31D in the liquid crystal display 31.

  The liquid crystal display 31 includes, as a plurality of symbols, a distance symbol 31a indicating an accumulated travel distance, a time symbol 31b indicating an accumulated engine operating time, a rotation speed symbol 31c indicating an engine speed, and a water temperature symbol 31d indicating the temperature of engine cooling water. , And a fueling symbol 31e indicating fueling. The distance symbol 31a and the time symbol 31b are arranged adjacent to the left side of the integrated display portion 31C in the liquid crystal display 31. The rotation speed symbol 31c is arranged adjacent to the right side of the rotation speed display portion 31D in the liquid crystal display 31. The water temperature symbol 31d is disposed adjacent to the right side of the temperature display unit 31E in the liquid crystal display 31. The fueling symbol 31e is disposed adjacent to the right side of the remaining amount display portion 31F in the liquid crystal display 31.

  The lamp unit 32 includes various warning lamps such as an engine lamp 32A for notifying an abnormality of the engine, an engine oil lamp 32B for notifying an abnormality of the lubrication system, a fuel supply lamp 32C for notifying that the remaining amount of fuel has decreased below a set value, and And a battery charge lamp 32D for notifying abnormality of the charging system.

As shown in FIGS. 4 to 8, the liquid crystal display 31 includes an auxiliary display unit 31 </ b> G that displays information related to the motor generator 3 in an empty area of the display area. The auxiliary display unit 31G has a 7-segment display and a 4-digit display part. The display ECU 33 operates the first digit display part of the auxiliary display unit 31G as the first display part 31Ga for displaying the state of the motor generator 3 as characters, and the remaining three digit display part is used as the remaining part of the battery 24. A control unit 33A for an auxiliary display unit that is operated as a second display part 31Gb that numerically displays the amount is provided.
In other words, in the empty area of the liquid crystal display 31, it is possible to add an auxiliary display unit 31G having a 4-digit display portion with a space-saving and inexpensive 7-segment display, without increasing the size of the liquid crystal display 31. Information regarding the motor generator 3 can be additionally displayed without reducing the size of each display unit such as the vehicle speed display unit 31A.
With respect to the display on the auxiliary display unit 31G, if the state of the motor generator 3 is a power running state (a state in which the motor generator 3 is used as a travel motor), the control unit 33A performs the control operation of the auxiliary display unit 40G. It is set so that “P”, which is an acronym of “Power” that is easily associated with the power running state, is displayed on one display portion 31Ga (see FIG. 6). Thereby, it is possible to notify the driver that the current state of the motor generator 3 is the power running state.
If the state of the motor generator 3 is the regenerative state (the state where the motor generator 3 is used as a generator), the regenerative state is changed at the first display portion 31Ga of the auxiliary display portion 31G by the control operation of the control portion 33A. “C”, which is an acronym for “Charge” that is easy to associate, is set to be displayed (see FIG. 7). Thereby, it is possible to notify the driver that the current state of the motor generator 3 is the regenerative state.
Furthermore, if the state of the motor generator 3 is neither the power running state nor the regenerative state, it is set so that nothing is displayed on the first display portion 31Ga of the auxiliary display portion 31G by the control operation of the control portion 33A. (See FIG. 8). Thereby, it is possible to inform the driver that the current state of the motor generator 3 is neither the power running state nor the regenerative state.
And in the 2nd display part 31Gb of the auxiliary | assistant display part 31G, it sets so that the remaining amount of the battery 24 may be displayed as a percentage by the control action of 33 A of control parts (refer FIGS. 6-8). Thereby, the remaining amount of the battery 24 can be notified to the driver.
As a result, it is possible to increase the size of the display device 20 by adopting an inexpensive segment method as the liquid crystal display 31 and additionally installing a space-saving and inexpensive auxiliary display unit 31G in the empty area of the liquid crystal display 31. Without causing a significant increase in cost, in addition to information related to the engine 2, the state of the motor generator 3 and the remaining amount of the battery 24 can be suitably displayed in a state in which the driver can easily see.

As shown in FIGS. 6 and 7, the control unit 33 </ b> A performs blinking control that shortens the blinking interval of the first display portion 31 </ b> Ga as the power level is higher, based on the power level of the motor generator 3.
Thereby, if the state of the motor generator 3 is the power running state, the higher the power level in the power running state, the shorter the blinking interval of “P” displayed on the first display part 31Ga and the faster the blinking operation. . Conversely, as the power level in the power running state decreases, the blinking interval of “P” displayed on the first display portion 31Ga becomes longer and the blinking operation becomes slower. Therefore, it is possible to notify the driver of the power level of the motor generator 3 in the power running state.
If the state of the motor generator 3 is the regenerative state, the higher the power level in the regenerative state, the shorter the blinking interval of “C” displayed on the first display part 31Ga and the faster the blinking operation. Conversely, the lower the power level in the regenerative state, the longer the blinking interval of “C” displayed on the first display part 31Ga and the slower the blinking operation. Therefore, the power level in the regenerative state of the motor generator 3 can be notified to the driver.
As a result, it is possible to display the power level of the motor generator 3 in the power running state and the regenerative state in a state where the driver can easily recognize without adding a new display unit.

As shown in FIGS. 4, 9, and 10, the control unit 33 </ b> A displays the display state of the auxiliary display unit 31 </ b> G, the state of the motor generator 3, and the remaining amount of the battery 24 based on information from the main ECU 23. Display switching control is performed to switch between a standard information display state, an abnormality information display state that displays an abnormality in the electric system including the motor generator 3, and a maintenance information display state that displays information necessary for maintenance of the electric system.
Specifically, when the control unit 33A detects an abnormality such as the motor generator 3 or the battery 24 based on information from the main ECU 23, the control unit 33A changes the display state of the auxiliary display unit 31G from the standard information display state. Switch to the information display state. In the abnormal information display state, the control unit 33A performs the control operation, and the auxiliary display unit 31G generates an abbreviation of “Error” such as “Er01” and a two-digit error code corresponding to the abnormal content at that time. Is displayed (see FIG. 9). As a result, it is possible to inform the driver that an abnormality has occurred in the electric system and the details of the abnormality at that time.
Further, based on information from the main ECU 23, the control unit 3A performs a switching operation from the normal operation mode to the maintenance mode for performing maintenance on the electric system such as the motor generator 3 or the battery 24 on the vehicle body side. If it is detected, the display state of the auxiliary display unit 31G is switched from the standard information display state to the maintenance information display state. In the maintenance information display state, if the control unit 33A is controlled to display the sensor identifier such as “Sa03” and the AD value on the auxiliary display unit 31G, for example, Information necessary for maintenance can be notified to the driver (see FIG. 10).
As a result, it is possible to appropriately inform the driver of an abnormality in the electric system and information required for maintenance without additionally installing a new display unit.

  The switching command between the operation mode and the maintenance mode for the main ECU 23 is configured to be output based on a combined operation of two switches among a plurality of switches such as the selection switch 27 provided in the riding section 4. Alternatively, the output may be based on the operation of a switch dedicated for switching between the operation mode and the maintenance mode.

As shown in FIG. 3, the liquid crystal display 31 is a dash that is a portion deviated to the right from a region where the driver's field of view is blocked by the steering wheel 18 in the dashboard 34 and is a portion close to the driver. The board 34 is arranged at the left and right intermediate portion.
Thereby, various information displayed on the liquid crystal display 31 can be easily visually recognized by the driver without being obstructed by the steering wheel 18.

As shown in FIGS. 3 and 5, the auxiliary display portion 31 </ b> G is disposed at a lower portion of the left end portion of the liquid crystal display 31 that is an end portion on the steering wheel side of the liquid crystal display 31.
As a result, the auxiliary display unit 31G is positioned at the position on the driver side in the liquid crystal display 31. As a result, while adopting a configuration in which a space-saving auxiliary display unit 31G is provided in an empty area of the liquid crystal display 31, information on the electric system displayed on the auxiliary display unit 31G is easily visible to the driver. Can do.

As illustrated in FIGS. 5 to 10, the auxiliary display unit 31 </ b> G includes a battery symbol 31 f indicating the battery 24. The controller 33A executes symbol blinking control for blinking the battery symbol 31f when the remaining amount of the battery 24 falls below a set value (see FIG. 7).
Thereby, it is possible to notify the driver that the remaining amount of the battery 24 has fallen below the set value only by additionally installing the battery symbol 31f in the auxiliary display portion 31G.

As the set value, a first set value (for example, a value of 30% at full charge) and a second set value (for example, a value of 15% at full charge) lower than the first set value are set. Has been. In the symbol blinking control, the control unit 33A determines the blinking interval of the battery symbol 31f when the remaining amount of the battery 24 falls below the second set value, compared to when the remaining amount of the battery 24 falls below the first set value. shorten.
Thereby, it is possible to notify the driver of the decrease in the battery 24 in two stages simply by setting the first set value and the second set value as set values.
As a result, the driver can be notified more clearly of the degree of battery 24 depletion.

As shown in FIGS. 4, 5, 11, and 12, the display ECU 33 includes a display switching unit 33B that switches the display state of the rotation speed display unit 31D. When the electric mode is selected as the driving mode for traveling, the display switching unit 33B changes the display state of the rotational speed display unit 31D from the standard display state (see FIG. 11) displaying the engine rotational speed to the electric mode. It switches to the auxiliary display state (refer to FIG. 12) for displaying characters. Further, when the selection of the electric mode is cancelled, the display switching unit 33B switches the display state of the rotation speed display unit 31D from the auxiliary display state to the standard display state.
That is, while the electric mode is selected, the display state of the rotation speed display unit 31D is in the auxiliary display state. In the auxiliary display state, “ELEC”, which is an abbreviation of “ELECTRIC” that is easily associated with the electric mode, is displayed on the rotation speed display unit 31D by the control operation of the display switching unit 33B (see FIG. 12). . Thereby, it is possible to notify the driver that the current driving mode for traveling is the electric mode.
On the other hand, while the selection of the electric mode is cancelled, the display state of the rotation speed display unit 31D becomes the standard display state. In the standard display state, the engine speed is numerically displayed on the rotation speed display unit 31D by the control operation of the display switching unit 33B (see FIG. 11). Thus, the driver can be informed that the current driving mode for traveling is an engine driving mode or a hybrid driving mode other than the electric mode.
That is, by effectively using the rotation speed display portion 31D that is unnecessary in the electric mode, the driver can be informed whether the driving mode for driving is the electric mode without adding a new display portion. it can.

As shown in FIGS. 11 and 12, the display switching unit 33B does not display the rotation speed symbol 31c when the electric mode is selected as the driving mode for traveling (see FIG. 12). Further, the display switching unit 33B displays the rotation speed symbol 31c when the selection of the electric mode is canceled (see FIG. 11).
Thereby, it is possible to inform the driver whether the current driving mode for traveling is the electric mode, or the engine driving mode or the hybrid driving mode other than the electric mode, in a state where it is easier to visually recognize.

  As shown in FIGS. 4, 5, 13, and 14, the display device 20 includes a changeover switch 35 that enables switching of information displayed on the integration display unit 31 </ b> C. The display switching unit 33B switches the display state of the integrated display unit 31C between the distance display state and the time display state based on an artificial operation of the changeover switch 35. Specifically, in the distance display state, the display switching unit 33B displays the distance symbol 31a without displaying the time symbol 31b and “h”, which is a unit of time, and integrates with the integration display unit 31C. The travel distance is displayed (see FIG. 13). In the time display state, the display ECU 33 displays the time symbol 31b and “h” as a unit of time without displaying the distance symbol 31a, and displays the accumulated engine operating time on the accumulated display portion 31C. (See FIG. 14).

As shown in FIGS. 3 and 4, the speed change lever 19 includes a notification lamp 36 made of a light emitting diode as a notification device 36 that notifies the selected driving mode for traveling at the upper end portion of the grip portion 19 </ b> A. Yes. The main ECU 23 controls the operation of the notification lamp 36 by the main control unit 23A. The main control unit 23A turns on the notification lamp 36 if the selected driving mode for traveling is the electric mode. Further, the main control unit 23A causes the notification lamp 36 to blink if the selected driving mode for traveling is the engine driving mode. Then, the main control unit 23A turns off the notification lamp 36 if the selected driving mode for traveling is the hybrid driving mode.
In other words, the currently selected driving mode for traveling is notified by using the speed change lever 19 that is easy to enter the driver's field of view by being adjacent to the steering wheel 18. The driver can be informed of the mode more reliably.
When the notification lamp 36 is provided on the steering wheel 18, a sliding contact that allows the steering wheel 18 to rotate is required for the electrical system extending over the notification lamp 36, whereas the notification lamp 36 is attached to the speed change lever 19. When it is provided, a sliding contact becomes unnecessary. As a result, the cost required for installing the notification lamp 36 can be reduced.

  Note that the alarm 36 may be provided at a portion other than the grip portion of the speed change lever 19. In addition, for example, the alarm 36 can display a notification lamp that can change the emission color according to the selected driving mode for traveling, or 7 segments that display abbreviations corresponding to the selected driving mode for traveling. A display provided with a light emitting diode may be adopted.

  The main ECU 23 controls the operation of the electronic buzzer 37 provided on the dashboard 34 by the control operation of the main control unit 23A. The main control unit 23A generates an operation sound when a switch operation such as the selection switch 27 provided in the boarding unit 4 is appropriately performed, so that the switch operation at that time is valid or invalid. To the passenger.

The main control unit 23A switches between a sound generation mode that generates an operation sound and a mute mode that does not generate an operation sound, based on the operation state of the changeover switch 38 provided on the dashboard 34.
Thus, the passenger can arbitrarily select the sound generation mode and the mute mode by operating the changeover switch 38, and when silence is required, the generation of the operation sound can be avoided.

[Another embodiment]
The present invention is not limited to the configuration exemplified in the above embodiment, and a typical alternative embodiment of the present invention will be exemplified below.

(1) The engine 2 may be a diesel engine equipped with a common rail system.

(2) The motor generator 3 may be an in-wheel type.

(3) The traveling device 6 may be a semi-crawler specification including a pair of left and right wheels and a pair of left and right crawlers, or a full crawler specification including a pair of left and right crawlers.

(4) The battery 24 may be a nickel metal hydride battery.

(5) The display device 20 does not include the temperature display unit 31E and the remaining amount display unit 31F in the liquid crystal display 31, but a segment type temperature composed of a pointer-type temperature display unit and a remaining amount display unit or a light emitting diode. A display unit and a remaining amount display unit may be provided.

(6) In the liquid crystal display 31, the arrangement of the auxiliary display unit 31 </ b> G can be variously changed according to the position of the empty area in the liquid crystal display 31. For example, if there is an empty area on the left side of the integration display unit 31C in the liquid crystal display 31, the auxiliary display unit 31G may be provided on the left side of the integration display unit 31C. Further, if there is an empty area on the left side of the shift display unit 31B in the liquid crystal display 31, an auxiliary display unit 31G may be provided on the left side of the shift display unit 31B.

(7) The liquid crystal display 31 may be provided in a portion that is deviated leftward from a region where the driver's field of view is blocked by the steering wheel 18 in the dashboard 34. In this arrangement, it is desirable that the auxiliary display portion 31G is disposed at the right end portion of the liquid crystal display 31 that is the end portion on the steering wheel side of the liquid crystal display 31.

(8) The display ECU 33 operates the display part of the fourth digit in the auxiliary display part 31G as the first display part 31Ga for displaying the state of the motor generator 3 by the control operation of the control part 33A, and the rest The three-digit display part may be configured to operate as a second display part 31Gb that numerically displays the remaining amount of the battery 24.

(9) When the power level of the motor generator 3 reaches the maximum value in the flashing control in which the control unit 33A for the auxiliary display unit shortens the flashing interval of the first display part 31Ga as the power level of the motor generator 3 increases. In addition, the first display portion 31Ga may be continuously lit.

(10) The control unit 33A for the auxiliary display unit may be configured not to perform the flashing control that shortens the flashing interval of the first display part 31Ga as the power level of the motor generator 3 is higher.

(11) The control unit 33A for the auxiliary display unit performs the battery blinking control for blinking the battery symbol 31f when the remaining amount of the battery 24 falls below the set value, along with the battery symbol 31f and the battery remaining adjacent to the battery symbol 31f. The unit of quantity ("%" in FIGS. 5 to 8) may be blinked.

(12) The setting value used for the symbol blinking control can be variously changed. For example, the set value may be set to a value of 25% when fully charged.

(13) The set value used for the symbol blinking control may be, for example, only one of the first set value and the second set value described above. In addition, the third set value may be used in addition to the first set value and the second set value to notify the driver of the decrease in the battery 24 in three stages.

(14) The display switching unit 33B, when the hybrid drive mode is selected as the drive mode for travel, according to the travel state automatically switched by the control operation of the main ECU 23 based on the control program for hybrid, etc. You may be comprised so that the display state of rotation speed display part 31D may be switched.
According to this configuration, for example, in the hybrid drive mode, when the traveling state is automatically switched to the electric state in which the traveling device 6 is driven only by the power from the motor generator 3 by the control operation of the main ECU 23, the display is performed. The switching unit 33B switches the display state of the rotational speed display unit 31D from the standard display state that displays the engine rotational speed to the auxiliary display state that displays characters in the electric mode (electrical state). Further, in the hybrid drive mode, the driving state is an engine driving state in which the traveling device 6 is driven only by the power from the engine 2 or the power from the motor generator 3 and the power from the engine 2 by the control operation of the main ECU 23. Is switched automatically to the hybrid drive state in which the traveling device 6 is driven, the display switching unit 33B switches the display state of the rotation speed display unit 31D from the auxiliary display state to the standard display state. .
Thus, by effectively using the rotation speed display unit 31D that is unnecessary in the electric state in the hybrid drive mode, the current driving state in the hybrid drive mode is It is possible to inform the driver whether the vehicle is in a state, an engine drive state other than that, or a hybrid drive state.

(15) In the auxiliary display state of the rotational speed display unit 31D, the display switching unit 33B is, for example, “batt” or “bAtt”, which is an abbreviation of “battery” that is easily associated with the electric mode in the rotational speed display unit 31D. Alternatively, “SLnt”, which is an abbreviation of “silent” meaning quietness, “StLt”, which is an abbreviation of “sterlth”, or the like may be displayed.

(16) The display switching unit 33B may be configured to always display the rotation speed symbol 31c regardless of whether the electric mode is selected as the driving mode for traveling or when the selection is canceled. .

(17) When the electric mode is selected as the driving mode for traveling, the display switching unit 33B displays the accumulated traveling distance on the integrated display unit 31C, and the engine driving mode or hybrid as the driving mode for traveling. When the drive mode is selected, the integrated display unit 31C may be configured to display the integrated engine operating time.
Further, when the electric mode is selected as the driving mode for traveling, the display switching unit 33B displays the distance symbol 31a without displaying the time symbol 31b, and displays the accumulated traveling distance in the accumulated display unit 31C. When the engine driving mode or the hybrid driving mode is selected as the driving mode for traveling, the time symbol 31b is displayed without displaying the distance symbol 31a, and the integrating engine 31C displays the integrating engine. The operation time may be displayed.

(18) The display device 20 may be configured such that the symbols displayed on the liquid crystal display 31 are switched according to the specifications of the work vehicle on which the display device 20 is mounted.
Specifically, as shown in FIGS. 15 and 16, in the liquid crystal display 31, the display device 20 includes a water temperature symbol 31 d indicating the temperature of engine cooling water and a cell temperature symbol 31 g indicating the temperature of the battery cell. The temperature display unit 31E is disposed adjacent to the temperature display unit 31E. Further, an oil supply symbol 31e indicating refueling and a charge symbol 31h indicating charging are arranged in an adjacent portion of the remaining amount display portion 31F. The display ECU 33 includes a symbol switching unit 33C that switches symbols to be displayed. The symbol switching unit 33C displays the water temperature symbol 31d and the refueling symbol 31e without displaying the cell temperature symbol 31g and the charging symbol 31h in a vehicle-mounted state in which information about the engine 2 can be acquired. In addition, in a vehicle-mounted state in which information about the engine 2 cannot be acquired, the cell temperature symbol 31g and the charging symbol 31h are displayed without displaying the water temperature symbol 31d and the fuel supply symbol 31e.
According to this configuration, for example, when the work vehicle includes only the engine 2 as the power source, or includes the engine 2 and the motor generator 3, the vehicle is in a vehicle-mounted state in which information on the engine 2 can be acquired. Therefore, the symbol switching unit 33C displays the water temperature symbol 31d and the fuel supply symbol 31e without displaying the cell temperature symbol 31g and the charging symbol 31h. Thereby, the display information on the temperature display unit 31E is the temperature of the engine coolant, and the driver can be notified that the display information on the remaining amount display unit 31F is the remaining amount of fuel. The driver can be informed of the temperature and the remaining amount of fuel.
Further, when the work vehicle includes, for example, only the electric motor or the motor generator 3 as its power source, since the information on the engine 2 cannot be acquired, the symbol switching unit 33C includes the water temperature symbol 31d. The fuel temperature symbol 31g and the charging symbol 31h are displayed without displaying the fueling symbol 31E31e. Thereby, the driver can be notified that the display information on the temperature display unit 31E is the temperature of the battery cell, and the display information on the remaining amount display unit 31F is the remaining amount of the battery 24. And the driver can be informed of the remaining amount of the battery 24.
In other words, the single display device 20 can be configured to have a combined specification that can be mounted on an engine specification work vehicle, a hybrid specification work vehicle, and an electric specification work vehicle.
As a result, compared with the case where a dedicated display device 20 corresponding to each specification is mounted on a work vehicle having different specifications, it can be advantageous in terms of cost and parts management.
As a matter of course, the display ECU 33 displays the temperature of the engine coolant on the temperature display unit 31E when the water temperature symbol 31d is displayed and the cell temperature symbol 31g is not displayed. The display ECU 33 causes the temperature display unit 31E to display the temperature of the battery cell when the cell temperature symbol 31g is displayed and the water temperature symbol 31d is not displayed.
Further, the display ECU 33 displays the remaining amount of fuel in the remaining amount display portion 31F in a state where the fuel supply symbol 31e is displayed and the charging symbol 31h is not displayed. The display ECU 33 displays the remaining amount of the battery 24 in the remaining amount display unit 31F in a state where the charging symbol 31h is displayed and the refueling symbol 31e is not displayed.

(19) In the display device 20 described in the other embodiment (18), for example, the display device 20 includes a first input unit to which information on the engine 2 is input, and information on the electric motor or the motor generator 3. The symbol switching unit 33C includes information regarding the engine 2 when the communication line is connected to both the first input unit and the first input unit and the second input unit. It is configured to determine that the vehicle is in a vehicle-mounted state in which acquisition of information on the engine 2 is impossible when the communication line is connected only to the second input unit. May be.

(20) In the display device 20 described in the other embodiment (18), for example, a human operation that informs the symbol switching unit 33C whether the display device 20 is in a vehicle-mounted state in which information about the engine 2 can be acquired. The symbol switching unit 33C may be configured to determine the in-vehicle state of the display device 20 based on the operation of the artificial operation tool.

(21) In the display device 20 described in the another embodiment (18), the symbol switching unit 33C switches the symbol displayed on the liquid crystal display 31 according to the selected driving mode for traveling. It may be configured as follows.
For example, when the electric mode is selected as the driving mode for traveling, the symbol switching unit 33C displays the cell temperature symbol 31g and the charging symbol 31h without displaying the water temperature symbol 31d and the fueling symbol 31e. . In addition, when the engine driving mode or the hybrid driving mode is selected as the driving mode for traveling, the symbol switching unit 33C does not display the cell temperature symbol 31g and the charging symbol 31h, but displays the water temperature symbol 31d and the fueling symbol. 31e is displayed.

  The present invention comprises a liquid crystal display having a plurality of display units for segmentally displaying information related to the engine, and a display electronic control unit for controlling the operation of the liquid crystal display, a multi-purpose work vehicle, a tractor, a mower, The present invention can be applied to a display device mounted on a work vehicle.

2 Engine 3 Motor generator 6 Traveling device 18 Steering wheel 23 Main electronic control unit 24 Battery 31 Liquid crystal display 31A Vehicle speed display unit 31B Shift display unit 31C Accumulation display unit 31D Revolution display unit 31E Temperature display unit 31F Remaining amount display unit 31G Auxiliary Display unit 31Ga First display region 31Gb Second display region 31d Water temperature symbol 31e Refueling symbol 31f Battery symbol 31g Cell temperature symbol 31h Charging symbol 33 Electronic control unit for display 33A Control unit 33B Display switching unit 33C Symbol switching unit 34 Dashboard

Claims (8)

A liquid crystal display having a plurality of display units for segmentally displaying information on the engine, and a display electronic control unit for controlling the operation of the liquid crystal display;
The liquid crystal display includes an auxiliary display unit that displays information about the motor generator in an empty area of the display area,
The auxiliary display unit has a 7-segment display and a 4-digit display part,
The display electronic control unit operates the display part of the first digit or the fourth digit in the auxiliary display unit as a first display part for displaying the state of the motor generator, and the remaining three digits. A display device for a work vehicle, comprising: a control unit for an auxiliary display unit that operates the display part as a second display part for numerically displaying a remaining battery level.   2. The work vehicle display device according to claim 1, wherein the control unit executes flashing control for shortening a flashing interval of the first display portion as the power level is higher based on a power level of the motor generator.   The control unit is configured to display a display state of the auxiliary display unit based on information from an in-vehicle main electronic control unit, a standard information display state that displays the state of the motor generator and the remaining battery level, and the motor generator. The work vehicle according to claim 1, wherein display switching control is performed to switch between an abnormality information display state that displays an abnormality in the electric system including the state and a maintenance information display state that displays information necessary for maintenance of the electric system. Display device. The liquid crystal display is arranged in a part that is laterally removed from an area where the driver's view is blocked by the steering wheel in the dashboard,
The said auxiliary | assistant display part is a display apparatus of the working vehicle as described in any one of Claims 1-3 arrange | positioned at the edge part by the side of the steering wheel in the said liquid crystal display. The auxiliary display unit includes a battery symbol indicating the battery,
5. The work vehicle display device according to claim 1, wherein the control unit executes symbol blinking control for blinking the battery symbol when the remaining amount of the battery falls below a set value. 6. As the set value, a first set value and a second set value lower than the first set value are set,
In the symbol flashing control, the control unit determines the flashing interval of the battery symbol when the remaining amount of the battery falls below the second set value, and the remaining amount of the battery falls below the first set value. The work vehicle display device according to claim 5, wherein the display device is shorter than the case. The in-vehicle main electronic control unit includes an electric mode for driving the traveling device only with power from the motor generator as a driving mode for traveling,
The liquid crystal display includes a rotation speed display section that has a 4-segment display portion in a 7-segment display and displays the engine rotation speed numerically.
The display electronic control unit includes a display switching unit that switches a display state of the rotation speed display unit,
When the electric mode is selected, the display switching unit displays the display state of the rotational speed display unit from the standard display state that displays the engine rotational speed to the character display that is the electric mode. When the selection of the electric mode is canceled, the display state of the rotation speed display unit is switched from the auxiliary display state to the standard display state according to any one of claims 1 to 6. The display device of the work vehicle as described. A water temperature symbol indicating the temperature of the engine cooling water and a cell temperature symbol indicating the temperature of the battery cell are provided in adjacent locations of the temperature display unit, and an oil supply symbol indicating fuel supply, and a charge symbol indicating charging, Deployed adjacent to the remaining amount display area,
The display electronic control unit includes a symbol switching unit that switches a symbol to be displayed.
The symbol switching unit displays the water temperature symbol and the refueling symbol without displaying the cell temperature symbol and the charging symbol in a vehicle-mounted state in which information on the engine can be acquired, and the engine 8. The cell temperature symbol and the charging symbol are displayed without displaying the water temperature symbol and the fueling symbol in an in-vehicle state in which acquisition of information on the vehicle is impossible. Display device for work vehicles.

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