Work vehicle

Abstract

To provide a work vehicle even as an electric work vehicle, the maintenance timing of which can be appropriately understood.SOLUTION: A work vehicle provided with a travel electric motor that allows a travel vehicle body to travel and a work machine electric motor that drives a work machine mounted on the travel vehicle body includes a high-voltage battery that drives the travel electric motor and the work machine electric motor and a low-voltage battery that supplies power to a vehicle controller. The work vehicle is provided with power-on time integration means that integrates the power-on time until a key switch is turned off after the key switch is turned on and motor driving time integration means that integrates the electric motor driving time in an operation mode in which the travel electric motor and the work machine electric motor are driven or either one is independently driven, and the integrated power-on time by the power-on time integration means and the integrated motor driving time by the motor driving time integration means are stored.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a work vehicle such as a lawnmower that is driven through a park or the like to mow the grass therein, and more particularly to an electric work vehicle equipped with a battery. [Background technology]

[0002] In a work vehicle equipped with a work time counter that accumulates the time the power is on, there is a configuration in which the work time is measured by stopping the accumulation while the vehicle is not traveling, the engine is stopped, and the work equipment is stopped (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-122244 A Summary of the Invention [Problem to be solved by the invention]

[0004] According to Patent Document 1, the time that the engine is actually running, the work vehicle is operating, or the work equipment is operating is accurately counted, so that this can be accurately reflected in the work management and labor management of workers.

[0005] However, the time measurement required to determine the appropriate timing for maintenance in an electric work vehicle is different from that in an engine-driven work vehicle.

[0006] In view of the above, the present invention provides an electric work vehicle that is capable of properly determining when maintenance is due. [Means for solving the problem]

[0007] In order to solve the above problems, the invention described in claim 1 provides a work vehicle equipped with a traveling motor 10 for traveling on a traveling body 1 and a work machine motor 16 for driving a work machine 4 attached to the traveling body 1, the work vehicle is equipped with a high-voltage battery 11 for driving the traveling motor 10 and the work machine motor 16, and a low-voltage battery 13 for supplying power to a vehicle controller 20, and is provided with a power-on time integrating means Ss for integrating the power-on time from when a key switch 38 is turned ON until when the key switch 38 is turned OFF, a motor drive time integrating means (Sm) for integrating the motor drive time during a drive mode in which the traveling motor (10) and the working motor (16) are both driven or are driven independently; The power-on accumulated time Ts calculated by the power-on time accumulating means Ss and the motor drive accumulated time Tm calculated by the motor drive time accumulating means Sm are stored.

[0008] The invention described in claim 2 is the invention described in claim 1, in which the motor drive integrated time Tm calculated by the motor drive time integrating means Sm is an integrated drive time of only the traveling electric motor 10.

[0009] The invention described in claim 3 is the invention described in claim 1, in which the motor drive integrated time Tm calculated by the motor drive time integrating means Sm is an integrated drive time of only the electric motor 16 for the work machine. Effect of the Invention

[0010] According to the invention described in claim 1, the timing of maintenance of the high-voltage battery 11 and the low-voltage battery 13 can be managed by displaying the power-on accumulated time Ts using the power-on time accumulation means Ss, and the timing of maintenance of the traveling motor 10 and the work machine electric motor 16 can be managed by displaying the motor drive accumulated time Tm using the motor drive time accumulation means Sm.

[0011] The invention as recited in claim 2 has the effect as recited in claim 1, and further has the effect of accurately measuring the timing of maintenance of the drive wheels and other propulsion systems by calculating the accumulated driving time of only the propulsion motor 10.

[0012] The invention described in claim 3 has the effect described in claim 1, and further has the effect of accurately measuring the timing of maintenance of the PTO shaft, the rotating parts of the work machine, etc. by calculating the cumulative driving time of only the work machine electric motor 16. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a left side view of a work vehicle according to an embodiment of the present invention. [Diagram 2] 2 is a left side view of the work vehicle with a bonnet cover in an open position. FIG. [Diagram 3] FIG. 2 is a perspective view of the work vehicle with the exterior of the work vehicle omitted. [Figure 4] FIG. 2 is a block diagram of a drive system of the work vehicle. [Diagram 5] FIG. 4 is a front view of a steering meter of the work vehicle. [Figure 6] FIG. 2 is a block diagram of communication of the control panel meter. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] As shown in Fig. 1, the work vehicle is a riding lawnmower having a traveling body 1, a pair of left and right front wheels 2 provided at the front of the traveling body 1, a pair of left and right rear wheels 3 provided at the rear of the traveling body 1, and a working implement 4 for cutting grass or the like provided between the front wheels 2 and the rear wheels 3 on the underside of the traveling body 1. In addition, a storage section 5 is provided at the front of the upper side of the traveling body 1, a control section 6 on which a driver sits is provided behind the storage section 5, a safety frame (ROPS) 8 for protecting the driver is provided behind the control section 6, and a grass collection container 7 for storing grass cut by the control section 4 is provided below the safety frame 8.

[0015] As shown in FIGS. 2 to 5, the housing section 5 is provided with a high-voltage battery 11 that stores electricity to be supplied to a traveling motor 10 that drives the rear wheels 3, etc., and the high-voltage battery 11 is covered with a bonnet cover 12.

[0016] A low-voltage battery 13 is disposed in front of the traveling motor 10 and high-voltage battery 11. This low-voltage battery 13 is configured to be able to supply power to the steering meter, various lamps such as headlights, control units, etc. This low-voltage battery 13 can also be covered with the bonnet cover 12.

[0017] The output rotation of the traveling electric motor 10 is configured to drive a hydrostatic continuously variable transmission (hereinafter, referred to as HST) 15 disposed in the center of the vehicle body 1 via a transmission belt 14 or the like. The HST 15 is configured to rotate the rear wheels 3 and the front wheels 2 by appropriately changing the speed using the output of a hydraulic motor that receives pressure oil from a hydraulic pump, with a known configuration.

[0018] In addition, the pump shaft of the HST 15 is extended rearward so as to drive an air compressor 17.

[0019] Furthermore, a work machine electric motor 16 that drives the work machine 4 is disposed in an appropriate location at the rear lower part of the vehicle body 1, and a driving force is transmitted between this work machine electric motor 16 and the work machine 4 via a connecting shaft.

[0020] The safety frame 8 is formed from a left support pillar 8L extending in the vertical direction, a right support pillar 8R extending in the vertical direction, and an inverted U-shaped connecting portion 8A connecting the upper parts of the left support pillar 8L and the right support pillar 8R.

[0021] Next, a control unit that drives the traveling motor 10 and the working machine motor 16 with a high voltage supplied from the high voltage battery 11 (e.g., 48V) will be described. As shown in Fig. 4, the traveling motor 10 is controlled through a vehicle controller 20 and a traveling driver unit 21 that are connected to each other so that they can exchange information via CAN (controller area network) communication. On the other hand, the working machine motor 16 is controlled through a vehicle controller 20 and a working machine driver unit 22 that are connected to each other so that they can exchange information via CAN communication. When the traveling motor 10 and the working machine motor 16 are switched off, regenerative braking is activated by the inertial force of the traveling vehicle body 1 and the inertial force of the working machine blade, and when the regenerative braking is activated, the traveling motor 10 and the working machine motor 16 function as a charging device that charges the high voltage battery 11.

[0022] An on-board charger 23 and a battery monitoring system (BMS) 24 that monitors the temperature, charging state, voltage protection, and short-circuit state of each cell of the high-voltage battery 11 are connected to the vehicle controller 20. The vehicle controller 20 is connected to a low-voltage battery (e.g., 12 V) 13 to receive power, and the low-voltage battery 13 is supplied with power from the high-voltage battery 11 after being stepped down via a DC-DC converter 25, enabling it to be charged.

[0023] The high-voltage battery 11 incorporates relay contacts such as a relay for an on-board charger 23 and a relay for a battery monitoring device 24 (both not shown) which are arranged on the output side of the vehicle controller 20, and is configured so that the relay contacts can be turned ON and OFF based on a command signal from the vehicle controller 20.

[0024] Next, the control panel meter 30 in Fig. 5 will be described. It is equipped with a liquid crystal display 31, and is configured so that the remaining charge of the high voltage battery 11 is displayed as a percentage in large characters on the central display 31a. An upper display 31b is provided above this central display 31a, and switches between displaying, for example, the RPM of the work machine electric motor 16 and the vehicle speed. A lower display 31c is provided below the central display 31a, and is configured to display the power-on time or motor drive time, which will be described later, in slightly smaller characters.

[0025] As shown in FIG. 6, the steering meter 30 and the vehicle controller 20 are connected by a wired communication line 33. The vehicle controller 20, which receives state of charge (SOC) information from the battery monitoring device (BMS) 24, can calculate the remaining battery charge. The state of charge is a numerical value received from the battery monitoring device 24. A battery remaining charge calculation unit 34 can calculate the remaining battery charge (%) from the state of charge (SOC) using the relational expression: state of charge (%) = (remaining capacity / capacity at full charge) x 100. The calculated remaining battery charge (%) is displayed on the central display unit 31a of the liquid crystal display unit 31 via the wired communication line 33.

[0026] Furthermore, rotation speed information of the traveling electric motor 10 can be received from the traveling driver unit 21, and the vehicle speed is calculated from this rotation speed information in the vehicle speed calculation unit 35. The vehicle speed can be displayed on the upper display portion 31b of the liquid crystal display unit 31. Similarly, rotation speed information of the work machine electric motor 16 can be received from the work machine driver unit 22, and this rotation speed can be displayed on the upper display portion 31b of the liquid crystal display unit 31. Note that a selection switch 36 can be used to arbitrarily select whether to display the vehicle speed or the rotation speed on the upper display portion 31b.

[0027] As described above, the power-on time or the motor drive time is displayed on the lower display section 31c of the liquid crystal display section 31. The selection is based on the operation of a second selection switch 37 arranged in a position symmetrical to the selection switch 36. Incidentally, the power-on accumulated time Ts is calculated by a power-on time accumulating means Ss, which counts the time from when the key switch 38 serving as the power switch is turned ON to when the key switch 38 is turned OFF, and accumulates the accumulated time.

[0028] On the other hand, the motor drive accumulated time Tm is calculated by a motor drive time accumulating means Sm to accumulate the drive time of the traveling electric motor 10 or the work machine electric motor 16 in the drive mode, and the drive time of the traveling electric motor and the work machine electric motor drive time are accumulated by a timer means which can input a drive output signal and a drive stop signal from the traveling driver unit 21 or the work machine driver unit 22. The motor drive time during a so-called drive mode in which the traveling electric motor 10 and the work machine electric motor 16 are both driven or independently driven is accumulated, and the motor drive time during this drive mode is displayed as the motor drive accumulated time Tm.

[0029] By displaying the power-on accumulated time Ts using the power-on time accumulation means Ss, the maintenance timing of the high-voltage battery 11 and the low-voltage battery 13 can be managed, and by displaying the motor drive accumulated time Tm using the motor drive time accumulation means Sm, the maintenance timing of the traveling motor 10 and the work machine electric motor 16 can be managed.

[0030] The motor drive time accumulation means Sm may manage the motor drive accumulated time Tm as follows. That is, the motor drive accumulated time Tm may be the accumulated drive time of only the traveling motor 10, or the accumulated drive time of only the work machine motor 16. By accumulating the accumulated drive time of only the traveling motor 10, the maintenance timing of the driving system such as the drive wheels can be accurately measured, and by accumulating the accumulated drive time of only the work machine motor 16, the maintenance timing of the PTO shaft, the work machine rotating part, etc. can be accurately measured.

[0031] Furthermore, the following configuration may be used. In the above case, the integration is performed during the driving mode, that is, when the traveling electric motor 10 and the work machine electric motor 16 are both driven or each is driven independently, so the configuration is such that integration is not performed during the charging mode, but the configuration may be such that integration is performed during this charging mode as well. In this way, if the period during charging is included, the total battery usage time during the driving mode and the charging mode can be known. [Explanation of symbols]

[0032] 1. Vehicle body 4 Work equipment 10. Electric motor for driving 11 High voltage battery 13 Low voltage battery 16 Electric motor for work equipment 20 Vehicle Controller 38 Key Switches Ss Power-on time accumulation means Sm Motor drive time integration means Ts Power-on cumulative time Tm Motor drive cumulative time

Claims

1. A work vehicle equipped with a traveling electric motor (10) that travels on a traveling body (1) and a work machine electric motor (16) that drives a work machine (4) attached to the traveling body (1), comprising a high-voltage battery (11) that drives the traveling electric motor (10) and the work machine electric motor (16) and a low-voltage battery (13) that supplies power to a vehicle controller (20), a power-on time integrating means (Ss) that integrates the power-on time from when a key switch (38) is turned on until the key switch (38) is turned off, and a motor drive time integrating means (Sm) that integrates the motor drive time during a drive mode in which the traveling electric motor (10) and the work machine electric motor (16) are both driven or are independently driven, and the power-on integrated time (Ts) by the power-on time integrating means (Ss) and the motor drive integrated time (Tm) by the motor drive time integrating means (Sm) are stored.

2. 2. The work vehicle according to claim 1, wherein the motor drive integrated time (Tm) calculated by the motor drive time integrating means (Sm) is an integrated drive time of the traveling electric motor (10) alone.

3. 2. The work vehicle according to claim 1, wherein the motor drive integrated time (Tm) calculated by the motor drive time integrating means (Sm) is an integrated drive time of only the work machine electric motor (16).

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