JP2021197817A - Work vehicle - Google Patents

Abstract

To curb unnecessary power consumption.SOLUTION: A work vehicle (1) comprises: an accelerator lever (201) to set a rotation speed of a motor (40); a battery output determination section (15) which determines whether the motor is in a no-load state; an automatic idling function setting section (13) which activates an automatic idling function when the motor is determined to be in the no-load state; and a motor rotation speed control section 14 which rotates the motor (40) at the rotation speed lower than the rotation speed set through the accelerator lever (201).SELECTED DRAWING: Figure 1

Description

The present invention relates to a work vehicle equipped with an electric motor.

In recent years, electrification is progressing in passenger cars, large vehicles such as buses and trucks, and work vehicles such as construction machinery and agricultural machinery. Since the rotation speed of the electric motor is determined by the position of the operation unit such as the accelerator sensor, if the accelerator sensor is in the high rotation position, the electric motor will maintain high rotation even when the work is not in progress. .. In this case, the power of the battery is greatly consumed even though the work is not in progress.

Therefore, for example, Patent Document 1 describes a configuration in which a reference rotation speed of an electric motor is switched according to a traveling mode or a working mode in an electric work vehicle.

Further, Patent Document 2 describes a power transmission device that performs idle stop control that connects a clutch after the engine rotation speed becomes equal to or higher than a predetermined value and cuts off the supply of electric power from the battery to the electric motor. ing.

Japanese Unexamined Patent Publication No. 2010-158934 (published on July 22, 2010) International Publication No. 2012/057024 (released May 3, 2012)

As described above, if the accelerator sensor is in the high rotation position, the electric motor will maintain high rotation even when the work is not in progress. The technique described in Patent Document 1 switches the reference rotation speed depending on whether the working mode or the traveling mode is used, and the rotation of the electric motor is maintained according to the position of the accelerator sensor even when the work is not in progress. become. Therefore, it is not possible to suppress the consumption of wasteful power.

Further, Patent Document 2 only describes that the supply of electric power to the electric motor is cut off when the engine speed is equal to or higher than a predetermined value, and the control of the electric motor during work or the like is described. No.

One aspect of the present invention has been made in view of the above problems, and an object of the present invention is to realize a work vehicle capable of suppressing unnecessary power consumption.

In order to solve the above-mentioned problems, the work vehicle according to one aspect of the present invention is a work vehicle provided with an electric motor, and the operation unit for setting the rotation speed of the electric motor and the work by the electric motor or It is set by the no-load state determination unit that determines whether or not the vehicle is in the no-load state, which is a state in which the vehicle is not running, and the operation unit when the no-load state determination unit determines that the no-load state is present. The auto-idle function setting unit for effectively setting the auto-idle function for rotating the electric motor at a rotation speed lower than the number of rotations, and the operation of the electric motor when the auto-idle function is enabled. It is provided with a motor rotation speed control unit that rotates at a rotation speed lower than the rotation speed set by the unit.

Conventionally, the electric motor continues to rotate at the rotation speed set by the operation unit regardless of whether or not it is in a no-load state. On the other hand, according to the above configuration, when it is determined that the electric motor is not working or running and is in a no-load state, the electric motor is rotated at a rotation speed lower than the rotation speed set by the operation unit. Enable the auto idle function to rotate with. Therefore, unlike the conventional case, the electric motor does not continue to rotate at the rotation speed set by the operation unit even though it is in a no-load state, so that wasteful power consumption is suppressed. can do.

In the work vehicle according to one aspect of the present invention, the no-load state determination unit acquires the energy value supplied to the electric motor at predetermined intervals, and uses the energy value every time the energy value is acquired. It may be the one that determines whether or not it is in the no-load state.

According to the above configuration, since the no-load state is determined using the energy value supplied to the electric motor, the no-load state can be appropriately determined. The energy value supplied to the electric motor includes, for example, the output power and output current of the battery that supplies power to the electric motor, the output power of the inverter that controls the rotation speed of the electric motor, and the output current.

In the work vehicle according to one aspect of the present invention, the auto-idle function setting unit enables the auto-idle function when the number of times the no-load state determination unit determines that the no-load state is determined is continuous for a predetermined number of times or more. It may be set to.

According to the above configuration, the auto idle function is enabled when the number of times the no-load state determination unit determines that the no-load state is determined is continuous for a predetermined number of times or more, that is, when a predetermined time elapses in the no-load state. do. That is, the auto idle function is not enabled when the load is momentarily unloaded. As a result, it is possible to prevent the rotation speed of the electric motor from being raised or lowered more than necessary.

In the work vehicle according to one aspect of the present invention, when the auto-idle function setting unit is effectively setting the auto-idle function and the no-load state determination unit determines that the auto-idle function is not in the no-load state, the auto-idle function is set. The function may be disabled.

According to the above configuration, when it is determined that the auto idle function is not in the no-load state while the auto idle function is enabled, the auto idle function is disabled. As a result, the rotation speed of the electric motor is set by the operation unit and becomes the rotation speed, so that the work or the like by the electric motor can be appropriately performed.

In the work vehicle according to one aspect of the present invention, the no-load state determination unit is used when the energy value exceeds the first threshold value or when the number of times the energy value exceeds the second threshold value continues for a predetermined number of times or more. , It may be determined that it is not in a no-load state.

According to the above configuration, when the energy value exceeds the first threshold value, or when the number of times the energy value exceeds the second threshold value continues for a predetermined number of times or more, it is determined that the state is not in the no-load state, so that the auto idle function is immediately activated. It is possible to deal with cases where it should be disabled and cases where it should be disabled after a certain period of time. The first threshold value is a value corresponding to an operation in which the auto idle function should be immediately disabled, and the second threshold value is invalid if the auto idle function is continued, although it is not necessary to immediately disable the auto idle function. It is a value corresponding to the operation to be set to.

In the work vehicle according to one aspect of the present invention, when the auto idle function setting unit is effectively setting the auto idle function and there is an operation on the operation unit, the no-load state determination unit is not in the no-load state. It may be determined that.

It is considered that the operation on the operation unit is due to the operator's intention to perform the work by the electric motor. Then, according to the above configuration, when the auto idle function is enabled and there is an operation on the operation unit, it is determined that the state is not in the no-load state, and the auto idle function is invalidated. As a result, it is possible to avoid a situation in which the auto idle function is effectively set and the rotation speed of the electric motor remains low even though the operator is trying to perform some work by the electric motor.

According to one aspect of the present invention, when it is determined that there is no load, which is a state in which the electric motor is not working or running, the electric motor is rotated at a rotation speed lower than the rotation speed set by the operation unit. Enable the auto idle function to rotate with. Therefore, unlike the conventional case, the electric motor does not continue to rotate at the rotation speed set by the operation unit even though it is in a no-load state, so that wasteful power consumption is suppressed. It has the effect of being able to do it.

It is a functional block diagram which shows the composition of the main part of the work vehicle which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the operation part seen from the driver's seat of a work vehicle. It is a flowchart which shows the flow chart of the process in a work vehicle, and is the flowchart which shows the flow chart which shows the process flow of enabling the auto idle function. It is a flowchart which shows the flow of processing in a work vehicle, and is the flowchart which shows the flow of processing which sets the auto idle function to OFF. It is a flowchart which shows the flow of the process based on the enable / disable of the auto idle function. It is a functional block diagram which shows the composition of the main part of the work vehicle which concerns on Embodiment 2 of this invention. It is a flowchart which shows the flow of processing in a work vehicle, and is the flowchart which shows the flow of processing which sets a traveling mode function to OFF. It is a figure for demonstrating the traveling mode function. It is a figure for demonstrating the traveling mode function.

[Embodiment 1]
Hereinafter, one embodiment of the present invention will be described in detail. First, the work vehicle 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing an outline of the work vehicle 1. In the present embodiment, the functions of the work vehicle 1 as a work vehicle and the functions related to traveling can be realized by using known techniques, and thus are not described here. Further, the work vehicle 1 will be described here by taking a tractor as an example, but the work vehicle 1 is not limited to the tractor. In addition to the tractor, it may be a construction machine vehicle or the like used for construction / construction.

As shown in FIG. 1, the work vehicle 1 includes an electronic control unit (ECU) 10, an operation unit 20, a battery pack 30, a motor (electric motor) 40, and an inverter 50.

The electronic control unit 10 is a unit that controls electronically in the work vehicle 1, and includes an operation position acquisition unit 11, a battery output acquisition unit 12, an auto idle function setting unit 13, and a motor rotation speed control unit 14.

The operation position acquisition unit 11 acquires the operation in the operation unit 20, specifically, the operation position of the accelerator lever (operation unit) 201 and the accelerator pedal 202, which will be described later, and notifies the auto idle function setting unit 13.

The battery output acquisition unit 12 acquires the output of the battery pack 30 at a predetermined cycle. The output of the battery pack 30 is the output power or the output current from the battery pack 30. The battery output acquisition unit 12 may acquire the output power or the output current of the inverter 50 instead of the output from the battery pack 30. That is, it can be said that the battery output acquisition unit 12 acquires the energy value supplied to the motor 40.

The auto idle function setting unit 13 includes a battery output determination unit (no load state determination unit) 15 to determine whether or not the work vehicle 1 is in the no load state, and when the work vehicle 1 is in the no load state, the auto idle function function. Is enabled.

The no-load state is a state in which the work vehicle 1 is not running or working. Whether or not the work vehicle 1 is in the no-load state is determined by the battery output determination unit 15. The battery output determination unit 15 determines whether or not the work vehicle 1 is in the no-load state by determining whether or not the output of the battery pack 30 is equal to or less than a predetermined value for a certain period of time from the battery output acquisition unit 12. judge. For example, the battery output determination unit 15 determines that the battery pack 30 is in a no-load state when the output power from the battery pack 30 is 4.0 [kw] or less for 3 [seconds].

The auto idle function means that even when the operating position of the accelerator lever 201 shown in FIG. 2 is at a position where the motor 40 rotates at a high speed, the rotation speed of the motor 40 is set at a low speed when there is no load. It is a thing. For example, when the maximum rotation speed of the motor 40 based on the operation position of the accelerator lever 201 is 2800 [r / min] and no load is applied, the rotation speed of the motor 40 is irrespective of the operation position of the accelerator lever 201. Is 1000 [r / min].

The motor rotation speed control unit 14 controls the rotation speed of the motor 40 according to whether or not the auto idle function is set by the auto idle function setting unit 13. That is, if the auto idle function is invalid, the motor rotation speed control unit 14 controls the rotation speed of the motor 40 based on the operation position of the accelerator lever 201 acquired by the operation position acquisition unit 11, and the auto idle function is effective. If so, the rotation speed of the motor 40 is controlled according to whether or not there is no load.

The operation unit 20 operates the work vehicle 1 and includes an accelerator lever 201, an accelerator pedal 202, a brake pedal 203, a shuttle lever 204, a clutch pedal 205, a main shift lever 206, and an auxiliary shift lever 207. FIG. 2 shows an example of the operation unit 20. In the example shown in FIG. 2, the accelerator lever 201 is arranged on the right side of the steering wheel, the shuttle lever 204 is arranged on the left side, the brake pedal 203 and the accelerator pedal 202 are arranged on the right side of the foot, and the clutch pedal 205 is arranged on the left side. Further, the main shift lever 206 and the auxiliary shift lever 207 are arranged on the left side of the seat.

The accelerator lever 201 is mainly used during work. When the lever is pulled toward you, the rotation speed of the motor 40 (and engine (not shown)) increases, and when the lever is pushed forward, the motor 40 (and) The number of revolutions of the engine) decreases. The accelerator pedal 202 is mainly used when traveling on the road. When the pedal is depressed, the rotation speed of the motor 40 (and the engine) increases, and when the foot is released from the pedal, the rotation speed is set by the accelerator lever 201. The number of revolutions of 40 (and the engine) decreases.

The brake pedal 203 forcibly stops the work vehicle 1 and is independent on the left and right sides. By connecting the left and right with a connecting bracket (not shown), the brakes on both the left and right wheels can be applied at the same time. The shuttle lever 204 switches between forward movement and reverse movement of the work vehicle 1. When the lever is lifted and pushed forward, the shuttle lever 204 moves forward, and when the lever is pulled toward the front, the shuttle lever 204 moves backward. The clutch pedal 205 intermittently transfers the power of the engine to each operating unit. When the pedal is depressed, the clutch is disengaged, and when the foot is released from the pedal, the clutch is engaged. The main shifting lever 206 and the auxiliary shifting lever 207 change the vehicle speed with respect to the operating positions of the accelerator lever 201 and the accelerator pedal 202, and the auxiliary shifting lever 207 is set to be finer with respect to the operating positions of the main shifting lever 206. Is to do.

The battery pack 30 is a battery that can be charged and discharged, and operates the motor 40 by supplying electric power to the motor 40 via the inverter 50.

The inverter 50 controls the rotation of the motor 40 according to the instruction of the motor rotation speed control unit 14.

[Processing flow]
Next, with reference to FIGS. 3 and 4, a flow of processing for enabling and disabling the auto idle function in the work vehicle 1 will be described. FIG. 3 is a flowchart showing the flow of processing for setting the auto idle function to be valid, and FIG. 4 is a flowchart showing the flow of processing for setting the auto idle function to be invalid.

As shown in FIG. 3, in the process of effectively setting the auto idle function, first, the battery output acquisition unit 12 acquires the output from the battery pack 30 (S101). Then, the battery output determination unit 15 determines whether or not the output acquired by the battery output acquisition unit 12 is equal to or less than the ON threshold value (S102). The ON threshold value is a threshold value for determining whether or not the work vehicle 1 is in a no-load state, and is determined based on the output of the battery pack 30 when the work vehicle 1 is working or not running. Then, when the output acquired by the battery output acquisition unit 12 is equal to or less than the ON threshold value (YES in S102), the battery output determination unit 15 adds “1” to the no-load state count (S103). The no-load state count is a value for determining whether or not the work vehicle 1 is in the no-load state. Then, the battery output determination unit 15 determines whether or not the no-load state count exceeds the count threshold value (S104). Then, when the no-load state count exceeds the count threshold value (YES in S104), the battery output determination unit 15 determines that there is no load state, and the auto idle function setting unit 13 effectively sets the auto idle function (YES in S104). S105).

On the other hand, when it is determined in step S102 that the output of the battery pack 30 is not equal to or less than the ON threshold value (NO in S102), the battery output determination unit 15 resets the no-load state count (S106), and when a predetermined time elapses. (YES in S107), the process returns to step S101. Then, the battery output acquisition unit 12 acquires the output of the battery pack 30. That is, the "predetermined time" in step S107 can be said to be a cycle in which the battery output acquisition unit 12 acquires the output of the battery pack 30. For example, if the predetermined time is 0.5 seconds, the battery output acquisition unit 12 acquires the output of the battery pack 30 at intervals of 0.5 seconds.

Further, in step S104, if the no-load state count does not exceed the count threshold value (NO in S104), the process proceeds to step S107, and when a predetermined time elapses (YES in S107), the process returns to step S101. That is, in this case, the process returns to step S101 while the no-load state count is maintained.

As described above, when the state in which the output of the battery pack 30 is smaller than the ON threshold value continues for a predetermined time or longer, it is determined that the battery pack 30 is in a no-load state, and the auto idle function can be effectively set. For example, if the predetermined interval is 0.5 seconds and the output of the battery pack 30 is smaller than the ON threshold value for 3 seconds or longer, and the no-load state is set, the no-load state count is "6". When it exceeds, it can be determined that there is no load. In this case, the count threshold is "6".

Further, when the output of the battery pack 30 becomes equal to or higher than the ON threshold value, the no-load state count is reset in step S106. Therefore, the no-load state count to be determined in step S104 is continuously "battery output <ON threshold value". It is the integrated value when it is determined that. It can be said that this is the number of times that the battery output determination unit 15 continuously determines that there is no load. Therefore, in step S104, it can be said that it is determined whether or not the number of times the battery output determination unit 15 determines that the no-load state is continuous is a predetermined number of times (count threshold value) or more.

Further, according to the above, when it is determined that there is no load, the auto idle function is enabled, so that the auto idle function is automatically enabled without any operation by the operator. Therefore, the power consumption of the motor 40 can be reduced without imposing a burden on the operator.

Further, as shown in FIG. 4, in the case of the process of disabling the auto idle function, the battery output acquisition unit 12 first acquires the output from the battery pack 30 (S201). Then, the battery output determination unit 15 determines whether or not the output acquired by the battery output acquisition unit 12 is larger than the OFF threshold value A (first threshold value) (S202). When it is larger than the ON threshold value A (YES in S202), the auto idle function setting unit 13 invalidates the setting of the auto idle function (S209).

On the other hand, when it is not larger than the ON threshold value A (NO in S202), the battery output determination unit 15 determines whether or not the output acquired by the battery output acquisition unit 12 is larger than the OFF threshold value B (second threshold value). (S203). Then, when it is larger than the OFF threshold value B (YES in S203), the battery output determination unit 15 adds "1" to the time count (S204). The time count is a value for determining whether or not the work vehicle 1 is no longer in the no-load state. Then, the battery output determination unit 15 determines whether or not the time count exceeds the count threshold value (S205). Then, when the time count exceeds the count threshold value (YES in S205), the battery output determination unit 15 determines that the no-load state is no longer present, and the auto idle function setting unit 13 sets the auto idle function to invalid (S209). ..

On the other hand, when it is determined in step S203 that the output of the battery pack 30 is not equal to or less than the OFF threshold value B (NO in S203), the battery output determination unit 15 resets the time count (S206). After that, the auto idle function setting unit 13 determines whether or not the accelerator lever 201 of the operation unit 20 has been operated from the operation position acquired by the operation position acquisition unit 11 (S207). Then, when there is no operation of the accelerator lever 201 (NO in S207) and a predetermined time elapses (YES in S208), the process returns to step S201. Then, the battery output acquisition unit 12 acquires the output of the battery pack 30.

Further, in step S205, if the time count does not exceed the count threshold value (NO in S205), the process proceeds to step S208, and when the predetermined time elapses (YES in S208), the process returns to step S201. That is, in this case, the process returns to step S201 while the time count is maintained.

Further, in step S207, when the accelerator lever 201 is operated (YES in S208), the auto idle function setting unit 13 sets the auto idle function to invalid (S209).

As described above, when the output of the battery pack 30 is the OFF threshold value A or less, the state where the output of the battery pack 30 is the OFF threshold value B or less continues for a predetermined time or more, or when the accelerator lever 201 is operated, the accelerator lever 201 is operated. It can be set to disable the auto idle function. By setting the OFF threshold value to two, the OFF threshold value A and the OFF threshold value B, the work that should instantly disable the auto idle function (for example, depressing the accelerator pedal 202) and the auto idle function are instantly disabled. It is not necessary to do this, but if it continues, it is possible to handle an operation (for example, touching the steering) in which the auto idle function should be disabled. It should be noted that OFF threshold value A> OFF threshold value B.

Further, when the output of the battery pack 30 becomes equal to or higher than the OFF threshold value B, the time count is reset in step S206. Therefore, the time count to be determined in step S205 is continuously “battery output> OFF threshold value B”. It is the integrated value when it is determined that. This can be said to be the number of times that the battery output determination unit 15 continuously determines that "battery output> OFF threshold value B". Therefore, in step S205, it can be said that it is determined whether or not the number of times that the battery output determination unit 15 determines that "battery output> OFF threshold value B" is continuous is a predetermined number of times (count threshold value) or more.

Next, with reference to FIG. 5, processing will be described when the auto idle function is set and when it is not set. FIG. 5 is a flowchart showing a flow of processing based on whether the auto idle function is enabled or disabled.

As shown in FIG. 5, when the auto idle function is enabled (ON) (YES in S301), the motor rotation speed control unit 14 rotates based on the auto idle function, that is, when there is no load, the rotation is low. When the rotation speed of the motor 40 is controlled so as to be (S302) and the auto idle function is not effective (OFF) (NO in S301), the motor rotation speed control unit 14 rotates based on the operation position of the accelerator lever 201. The rotation speed of the motor 40 is controlled so as to be (S303).

[Embodiment 2]
Other embodiments of the present invention will be described below. For convenience of explanation, the same reference numerals are given to the members having the same functions as the members described in the above-described embodiment, and the description thereof will not be repeated.

The work vehicle 1A according to the present embodiment is different from the work vehicle 1 described in the above-described first embodiment in that it has a traveling mode function. In the traveling mode, when the traveling mode function is enabled (ON), the rotation speed of the motor 40 is controlled by the degree of depression of the accelerator pedal 202 according to the positions of the main shifting lever 206 and the auxiliary shifting lever 207, while traveling. When the mode function is disabled (OFF), the rotation speed of the motor 40 becomes constant according to the position of the accelerator lever 201. In addition, instead of the mechanical transmission, control by stepless speed change may be performed.

Generally, the motor 40 has a rotation speed corresponding to the operating position of the accelerator lever 201. Therefore, if the operating position of the accelerator lever 201 is in the high rotation position, the motor 40 will continue to rotate at high rotation. This is the same even when the work vehicle 1 is stopped or traveling at a low speed. In this case, the motor 40 unnecessarily maintains high rotation.

The work vehicle 1 according to the present embodiment is provided with the travel mode function, and when the travel mode function is enabled, the rotation speed of the motor 40 is controlled by the degree of depression of the accelerator pedal 202. Therefore, it is possible to prevent the motor 40 from continuing to rotate at a high rotation speed even though the vehicle is not traveling or is traveling at a low speed.

The enable / disable of the travel mode function can be set by a switch (not shown) included in the operation unit 20. When the traveling mode function is disabled, it can be automatically performed by the traveling mode setting unit 18 described later.

FIG. 6 shows a functional block diagram of the work vehicle 1A according to the present embodiment. As shown in FIG. 6, the work vehicle 1A includes a travel mode setting unit 18 in the electronic control unit 10A instead of the auto idle function setting unit 13 of the work vehicle 1.

The travel mode setting unit 18 includes a battery output determination unit 19, and determines whether or not the work vehicle 1A is in a no-load state while not traveling, and is not traveling and is not in a no-load state. In addition, the driving mode function is disabled.

Similar to the first embodiment, the no-load state is a state in which work or the like is not performed in the work vehicle 1A. Whether or not the work vehicle 1A is in the no-load state is determined by the battery output determination unit 19. The battery output determination unit 19 determines whether or not the work vehicle 1 is in the no-load state by determining whether or not the output of the battery pack 30 is equal to or less than a predetermined value for a certain period of time from the battery output acquisition unit 12. judge.

With reference to FIGS. 8 and 9, the relationship between the pedal depression degree (pedal angle) of the accelerator pedal 202 and the rotation speed of the motor 40 will be described when the traveling mode function is ON and OFF. Here, it is assumed that the work vehicle 1 includes a main shift lever 206 and an auxiliary shift lever 207, and the shift by the main shift lever 206 is a stepless shift.

Reference numeral 801 in FIG. 8 indicates the relationship between the pedal depression degree (pedal angle) of the accelerator pedal 202 and the rotation speed of the motor 40 when the traveling mode function is enabled (ON) and the vehicle moves forward. As shown by reference numeral 801 when the traveling mode function is enabled, the rotation speed of the motor 40 increases as the degree of depression of the accelerator pedal 202 increases. The "H speed", "M speed", and "L speed" in FIG. 8 are operating positions of the auxiliary shift lever 207, and are in the order of "H speed" → "M speed" → "L speed". The degree of increase in the rotation speed of the motor 40 with respect to the degree of depression of the accelerator pedal 202 becomes small.

Reference numeral 802 in FIG. 8 indicates the relationship between the pedal depression degree (pedal angle) of the accelerator pedal 202 and the rotation speed of the motor 40 when the traveling mode function is disabled (OFF). As shown by reference numeral 802, when the traveling mode function is disabled, the rotation speed of the motor 40 becomes constant at R_OFF. Here, it is assumed that the rotation speed of the motor 40 based on the operation position of the accelerator lever 201 is R_OFF.

Further, FIG. 9 shows the relationship between the pedal depression degree (pedal angle) of the accelerator pedal 202 and the rotation speed of the motor 40 when the traveling mode function is effective and the vehicle moves backward. As shown by reference numeral 901 in FIG. 9, the traveling mode function is effective, and the rotation speed of the motor 40 increases as the degree of depression of the accelerator pedal 202 increases, as in the case of moving backward and moving forward. However, the degree to which the rotation speed of the motor 40 increases becomes smaller than in the case of moving forward. This is because the required speed is slower in the case of reverse movement than in the case of forward movement. It should be noted that this is not essential, and the relationship between the degree of depression of the accelerator pedal 202 and the rotation speed of the motor 40 may be the same in the case of forward movement and the case of reverse movement.

Next, with reference to FIG. 7, the flow of processing when the traveling mode function is disabled will be described. Here, it is assumed that the traveling mode function is enabled in advance. In the process of disabling the traveling mode function, first, the battery output acquisition unit 12 acquires the output from the battery pack 30 (S401). Then, the battery output determination unit 19 determines whether or not the output acquired by the battery output acquisition unit 12 is larger than the mode threshold value A while the work vehicle 1A is not running (S402). When it is larger than the mode threshold value A (YES in S402), the traveling mode setting unit 18 invalidates (OFF) the setting of the traveling mode function (S408).

On the other hand, when it is not larger than the mode threshold value A (NO in S402), the battery output determination unit 19 determines whether or not the output acquired by the battery output acquisition unit 12 is larger than the mode threshold value B (S403). Then, when it is larger than the mode threshold value B (YES in S403), the battery output determination unit 19 adds "1" to the time count (S404). Then, the battery output determination unit 19 determines whether or not the time count exceeds the count threshold value (S405). Then, when the time count exceeds the count threshold value (YES in S405), the battery output determination unit 19 determines that the no-load state is no longer present, and the travel mode setting unit 18 disables the travel mode function (S209).

On the other hand, when it is determined in step S403 that the output of the battery pack 30 is not larger than the mode threshold value B (NO in S403), the battery output determination unit 19 resets the time count (S406). Then, when the predetermined time elapses (YES in S407), the process returns to step S401. Then, the battery output acquisition unit 12 acquires the output of the battery pack 30.

Further, in step S405, if the time count does not exceed the count threshold value (NO in S405), the process proceeds to step S407, and when the predetermined time elapses (YES in S407), the process returns to step S401. That is, in this case, the process returns to step S401 while the time count is maintained.

As described above, the traveling mode function is disabled (OFF) when the output of the battery pack 30 is larger than the mode threshold value A and when the output of the battery pack 30 is larger than the mode threshold value B for a predetermined time or longer. Can be set. By setting two threshold values, mode threshold value A and mode threshold value B, the work that should instantly disable the running mode function (for example, work performed by rotating the motor 40 at high speed such as PTO work) and It is not necessary to disable the driving mode function instantly, but if it is to be continued, it is possible to deal with an operation (for example, touching the steering wheel) in which the driving mode function should be disabled.

[Modification example]
The work vehicle 1 may have both the functions of the first embodiment and the functions of the second embodiment. That is, the work vehicle 1 may have both an auto idle function and a traveling mode function.

[Example of implementation by software]
The control block (particularly the electronic control unit 10 (10A)) of the work vehicle 1 (1A) may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or by software. You may.

In the latter case, the work vehicle 1 (1A) includes a computer that executes instructions of a program that is software that realizes each function. This computer includes, for example, at least one processor (control device) and at least one computer-readable recording medium in which the program is stored. Then, in the computer, the processor reads the program from the recording medium and executes the program, thereby achieving the object of the present invention. As the processor, for example, a CPU (Central Processing Unit) can be used. As the recording medium, a "non-temporary tangible medium", for example, a ROM (Read Only Memory) or the like, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, a RAM (Random Access Memory) for expanding the above program may be further provided. Further, the program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. It should be noted that one aspect of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the above program is embodied by electronic transmission.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention. Further, by combining the technical means disclosed in each embodiment, new technical features can be formed.

1, 1A Work vehicle 10, 10A Electronic control unit 11 Operation position acquisition unit 12 Battery output acquisition unit 13 Auto idle function setting unit 14 Motor rotation speed control unit 15 Battery output determination unit (no load state determination unit)
18 Driving mode setting unit 19 Battery output judgment unit 20 Operation unit 30 Battery pack 40 Motor (electric motor)
50 Inverter 201 Accelerator lever (operation unit)
202 Accelerator pedal 203 Brake pedal 204 Shuttle lever 205 Clutch pedal 206 Main shift lever 207 Sub shift lever

Claims (6)

A work vehicle equipped with an electric motor
An operation unit that sets the rotation speed of the electric motor,
A no-load state determination unit for determining whether or not a no-load state is a state in which work or traveling by the electric motor is not performed, and a no-load state determination unit.
When the no-load state determination unit determines that the no-load state is present, the auto-idle function for effectively setting the auto-idle function for rotating the electric motor at a rotation speed lower than the rotation speed set by the operation unit. Setting part and
When the auto idle function is effectively set, the motor rotation speed control unit for rotating the electric motor at a rotation speed lower than the rotation speed set by the operation unit is provided. Work vehicle to do. The no-load state determination unit acquires the energy value supplied to the electric motor at predetermined intervals, and each time the energy value is acquired, the energy value is used to determine whether or not the electric motor is in the no-load state. The work vehicle according to claim 1, wherein the determination is made. 2. The auto idle function setting unit is characterized in that the auto idle function is effectively set when the number of times the no-load state determination unit determines that the no-load state is determined is continuous for a predetermined number of times or more. The work vehicle described in. The auto-idle function setting unit is characterized in that the auto-idle function is disabled when the no-load state determination unit determines that the auto-idle function is not in the no-load state while the auto-idle function is being enabled. The work vehicle according to claim 2 or 3. The no-load state determination unit determines that the no-load state is not obtained when the energy value exceeds the first threshold value or when the number of times the energy value exceeds the second threshold value continues for a predetermined number of times or more. The work vehicle according to claim 4, which is characterized. 4. The fourth aspect of the present invention is that when the auto idle function setting unit is in the process of effectively setting the auto idle function and there is an operation on the operation unit, the no-load state determination unit determines that the operation unit is not in the no-load state. Or the work vehicle according to 5.

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