The present invention claims priority under 35 U.S.C. ยง 119 to Japanese Application, 2022-112435, filed on Jul. 13, 2022, the entire contents of which being incorporated herein by reference.
The present invention relates to a control system for a work vehicle including a work implement.
Work vehicles that include a work implement have been conventionally known. For example, lawn mowing vehicles that include a lawn mowing device as a work implement driven to perform a lawn mowing work have been conventionally known. As such a work vehicle, an electric work vehicle including a traveling motor that is an electric motor that drives wheels and a work motor that is an electric motor that drives a work implement is also considered.
For example, Patent Document 1 describes a work vehicle in which each of traveling motors that are left and right electric motors drives wheels at a corresponding side and a work motor drives a rotation blade of a lawn mowing device (work implement).
It is also described that the vehicle described in Patent Document 1 includes an ROS switch that corresponds to a backward work permission switch. When the vehicle is about to move in a backward direction with the lawn mowing device activated, the blade of the lawn mowing device stops under normal conditions. When the ROS switch is closed, that is, is turned ON, an operation of the work motor is enabled by performing an operation of causing the vehicle to travel in the backward direction. Thus, mowing in the backward direction can be performed without being interrupted.
In the vehicle described in Patent Document 1, there is still room for improvement from a viewpoint of enhancing safety when the backward work permission switch is operated OFF.
It is an object of the present invention to further enhance safety in a control system for a work vehicle when a backward work permission switch is operated OFF.
A first control system for a work vehicle according to the present invention is a control system for a work vehicle that includes a work implement and includes a work operation unit that instructs driving of the work implement by an ON operation performed by a user, a traveling operation unit that instructs forward traveling, backward traveling, and stopping of the work vehicle by an operation performed by the user, a control device that controls driving of the work implement in accordance with the operation of the work operation unit, controls traveling of the work vehicle in accordance with the operation of the traveling operation unit, and forcibly stops the work implement when the work vehicle travels backward, and a backward work permission switch that disables forced stopping of the work implement at a start of backward traveling of the work vehicle by the ON operation performed by the user, in a case where the backward work permission switch is operated ON and the work operation unit is operated ON, the control device drives the work implement when the work vehicle travels backward and, in a case where the backward work permission switch is operated OFF and the work operation unit is operated ON, the control device forcibly stops the work implement both when the work vehicle is traveling backward and when the work vehicle is shifted from a backward traveling state to a stop state.
According to the first control system for a work vehicle described above, work efficiency can be increased and safety of the vehicle when the backward work permission switch is operated OFF can be further enhanced. Specifically, even when the vehicle travels backward, the work implement can be driven by control performed with the backward work permission switch operated ON, and therefore, a work while the vehicle is traveling backward is enabled and the work efficiency can be increased. Moreover, the work implement is forcibly stopped by control performed with the backward work permission switch operated OFF not only when the vehicle is traveling backward but also when the vehicle is shifted from a backward traveling state to a stop state. Thus, it is easier for a driver to prevent, in a case where the driver intentionally operates the backward work permission switch OFF, an obstacle from approaching the work implement in operation during backward traveling in which it is harder for the driver to see an area ahead of the vehicle in a travel direction than in forward traveling, so that safety can be further enhanced. It is also possible to prevent the driver from unintentionally and abruptly restarting driving of the work implement when the vehicle stops from backward traveling. Thus, safety can be further enhanced.
A second control system for a work vehicle according to the present invention is a control system for a work vehicle that includes a work implement, and includes a work operation unit that instructs driving of the work implement by an ON operation performed by a user, a traveling operation unit that instructs forward traveling, backward traveling, and stopping of the work vehicle by an operation performed by the user, a control device that controls driving of the work implement in accordance with the operation of the work operation unit, controls traveling of the work vehicle in accordance with the operation of the traveling operation unit, and forcibly stops the work implement when the work vehicle travels backward, and a backward work permission switch that disables forced stopping of the work implement at a start of backward traveling of the work vehicle by the ON operation performed by the user, in a case where the backward work permission switch is operated ON and the work operation unit is operated ON, the control device drives the work implement when the work vehicle travels backward, in a case where the backward work permission switch is operated OFF and the work operation unit is operated ON, the control device forcibly stops the work implement when the work vehicle travels backward, and after forcibly stopping the work implement, the control device drives the work implement only when the work vehicle finishes backward traveling and the work operation unit is shifted to an OFF operation and then is shifted to an ON operation again.
According to the second control system for a work vehicle described above, similar to the first control system for a work vehicle, work efficiency can be increased and safety of the vehicle when the backward work permission switch is operated OFF can be further enhanced. Furthermore, after forced stopping of the work implement when the work vehicle is traveling backward, the driver can limit restart of driving of the work implement to a case where the driver intentionally switches the work operation unit from the OFF operation to the ON operation, so that an even higher sense of safety can be given to the driver.
A third control system for a work vehicle according to the present invention is a control system for a work vehicle that includes two traveling motors at left and right coupled to two wheels at left and right and driven independently from each other, two operation levers that are arranged separately at left and right of a driver's seat and each of which instructs a rotation direction and rotation speed of one of the wheels located at a corresponding side by moving of the corresponding operation lever in a front-rear direction, and a work implement, and includes a work operation unit that instructs driving of the work implement by an ON operation performed by a user, a control device that controls driving of the work implement in accordance with the operation of the work operation unit, controls traveling of the work vehicle in accordance with operations of the two operation levers, and forcibly stops the work implement when the work vehicle travels backward, and a backward work permission switch that disables forced stopping of the work implement at a start of backward traveling of the work vehicle by the ON operation performed by the user, in a case where the backward work permission switch is operated OFF and the work operation unit is operated ON, the control device forcibly stops the work implement at least one of when it is determined that the two wheels at left and right rotate in a backward direction and when it is determined that average speed of the two wheels at left and right is equal to or higher than a predetermined value in terms of speed in the backward direction.
According to the third control system for a work vehicle described above, not only when both of the two wheels merely rotate in the backward direction but also when the average speed of the two wheels is equal to or higher than the predetermined value in terms of speed in the backward direction, it is determined that the vehicle is traveling backward. Thus, a turn in which it is difficult for the driver to see the travel direction only by viewing, such as a turn in which the rotation directions of the two wheels are opposite to each other and the vehicle moves while turning in the backward direction as a whole, is also set as backward traveling. Therefore, safety can be further enhanced by performing control to forcibly stop the work implement by determining backward traveling when the backward work permission switch is operated OFF.
In the first control system for the work vehicle described above, the control device may be configured to forcibly stop the work implement when the work vehicle travels backward in a case where the backward work permission switch is operated OFF and the work operation unit is operated ON, and to drive the work implement, after forcibly stopping the work implement, only when the work vehicle finishes backward traveling and the work operation unit is shifted to the OFF operation and then is shifted to the ON operation again.
According to the above-described configuration, similar to the second control system for a work vehicle described above, after forcibly stopping the work implement, when the work vehicle is traveling backward, the driver can limit restart of driving of the work implement to a case where the driver intentionally switches the work operation unit from the OFF operation to the ON operation, so that an even higher sense of safety can be given to the driver.
In the above-described configuration, a configuration in which the above-described configuration includes two traveling motors at left and right coupled to two wheels at left and right and driven independently from each other and two operation levers as the traveling operation units that are arranged separately at left and right of a driver's seat and each of which instructs a rotation direction and rotation speed of one of the wheels located at a corresponding side by moving of the corresponding operation lever in a front-rear direction, and, in a case where the backward work permission switch is operated OFF and the work operation unit is operated ON, the control device forcibly stops the work implement at least one of when it is determined that the two wheels at left and right rotate in a backward direction and when it is determined that average speed of the two wheels at left and right is equal to or higher than a predetermined value in terms of speed in the backward direction may be employed.
According to the above-described configuration, similar to the third control system for a work vehicle described above, a turn in which it is difficult for the driver to see the travel direction only by viewing, such as a turn in which the rotation directions of the two wheels are opposite to each other and the vehicle moves while turning in the backward direction as a whole, is also set as backward traveling. Therefore, safety can be further enhanced by performing control to forcibly stop the work implement by determining backward traveling when the backward work permission switch is operated OFF.
According to a control system for the work vehicle, safety can be further enhanced when a backward work permission switch is operated OFF.
An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. In the following description, a case where a work vehicle is a lawn mowing vehicle will be described, but the work vehicle is not limited thereto and may be any other work vehicle including a work implement that performs one or more works of a snow removal work, an excavation work, a construction work, and an agricultural work. Although, in the following description, basically, a case where the present invention is applied to a vehicle including two operation levers at left and right that correspond to travel instruction tool also serving as steering instruction will be described, this is merely an example and the present invention may be applied to a vehicle in which a steering wheel is used as a turning indicator and an accelerator pedal provided at a front side of a seat is used as a travel instruction tool. In this case, traveling of the travel instruction tool is used to mean traveling excluding turning. Shapes, a number of components, arrangement relationship of parts, or the like described below are merely examples for illustrative purposes and may be changed as appropriate to comply with specifications of the work vehicle. In the following description, similar elements in all of the drawings are denoted by a same reference numeral and redundant description will be omitted or simplified.
With reference to
The vehicle 10 is a passenger self-propelled lawn mowing vehicle suitable for lawn mowing. The vehicle 10 includes the left wheel 12 and the right wheel 13 (
The left wheel 12 and the right wheel 13 are rear wheels supported at both left and right sides at a rear side of a main frame 20 that is a vehicle body and serve as main drive wheels. The main frame 20 is formed of metal, such as steel or the like, into a beam structure or the like. The main frame 20 includes side plate portions 20a and 20b that extend approximately in a front-rear direction at both left and right ends and a coupling portion 20c that couples the side plate portions 20a and 20b at the left and right sides. Between rear end portions of the left and right side plate portions 20a and 20b, a driver's seat 21 on which a driver as a user sits is fixed at an upper side.
The left and right operation levers 22 and 23 are arranged separately on left and right of the driver's seat 21, respectively, and each of the left and right operation levers 22 and 23 instructs a rotation direction and rotation speed of a corresponding one of the left wheel 12 and the right wheel 13 at a corresponding side by moving the corresponding one of the operation levers 22 and 23 in a front-rear direction. Specifically, in the main frame 20, two guide panels 26 and 27 are fixed at both of left and right sides of the driver's seat 21, and the two operation levers 22 and 23 at left and right are supported on the main frame 20 so that each of the two levers 22 and 23 at left and right projects upward from a corresponding one of the two guide panels 26 and 27. The left operation lever 22 corresponds to a travel instruction tool that instructs acceleration/deceleration, stopping, and forward/reverse rotation of the left traveling motor 30, and the right operation lever 23 corresponds to a travel instruction tool that instructs acceleration/deceleration, stopping, and forward/reverse rotation of the right traveling motor 31. Respective tip end portions of the operation levers 22 and 23 are gripped by the driver and are used for instructing rotation directions and rotation speeds of the left wheel 12 and the right wheel 13. The left operation lever 22 is operated for instructing a drive state of the left wheel 12. The right operation lever 23 is operated for instructing a drive state of the right wheel 13. Each of the operation levers 22 and 23 has an approximate L-shape, so that a gripping portion 24 extending in a left-right direction in an upper end portion is formed. The gripping portion 24 is gripped and operated by the driver. Each of the operation levers 22 and 23 can be rocked about a shaft extending in the left-right direction at a lower end portion. As for each of the operation levers 22 and 23, when the operation lever 22 (or 23) is tilted forward using as a reference an N position that is a neutral position near an upright position, the operation lever 22 (or 23) instructs to drive the motor 30 (or 31) at a same side as the operation lever 22 (or 23) at a target rotation number per unit time (sec-1) that is a target rotation speed corresponding to forward traveling. As the target rotation speed, a target rotation number per minute (min-1) may be set. Each of the operation levers 22 and 23 instructs to cause the target rotation number to increase as a tilt amount increases. When the operation lever 22 (or 23) is tilted backward using the N position as a reference, the operation lever 22 (or 23) instructs to drive the motor 30 (or 31) on the same side as the operation lever 22 (or 23) at a target rotational number corresponding to backward traveling and instructs to cause the target rotational number to increase as the tilt amount increases. When being moved to the N position, each of the operation lever 22 and 23 instructs to stop driving of the motor 30 (or 31) at the same side as the operation lever 22 (or 23). Thus, each operation levers 22 and 23 instructs forward traveling, backward traveling, and stopping of the vehicle by instructing the target rotation number of a corresponding one of the traveling motors 30 and 31 by an operation by the user.
Tilt positions of the two operation levers 22 and 23 at left and right in the front-rear direction are detected by a left lever sensor 50 and a right lever sensor 51 (
The two caster wheels 15 and 16 at left and right are steered wheels supported on a front end portion of the main frame 20 and also serve as front wheels. The caster wheels 15 and 16 are provided so as to be spaced apart from the left wheel 12 and the right wheel 13 in the front-rear direction of the vehicle 10. Each of the caster wheels 15 and 16 is capable of free rotation of 360 degrees or more about a shaft extending in the vertical direction (up-down direction in
As illustrated in
The battery 82 (
As illustrated in
Thus, the blade elements can rotate to cut and mow a lawn. A corresponding one of the three deck motors 60 that are work motors is coupled to each of the three lawn mowing blades 18a, 18b, and 18c. The battery 82 is coupled to each of the deck motors 60 via a deck inverter 88 (
The lawn mowing device may be configured to include, as a rotary lawn mowing tool, a lawn mowing reel that includes, for example, a spiral blade arranged around a rotation shaft parallel to a ground surface, has a function of mowing a lawn or the like, and is driven by a deck motor.
On the other hand, a configuration in which the vehicle includes only one traveling motor, instead of the two traveling motors 30 and 31 at left and right, and only one work motor, instead of the three deck motors 60, and the operation levers 22 and 23 instruct the target rotation number of the one traveling motor and the work drive switch 33 instructs driving of the one work motor may be employed.
The control device 40 controls driving of the lawn mowing device 18 in accordance with an operation of the work drive switch 33 and controls traveling of the vehicle 10 in accordance with an operation of the operation levers 22 and 23. Furthermore, when the vehicle 10 is traveling backward, the control device 40 forcibly stops driving of the lawn mowing device 18 by stopping the deck motors 60 during a normal operation in which the backward work permission switch 34 that will be described later is not operated ON.
The backward work permission switch 34 can be operated ON or OFF by the driver and forced stopping of the lawn mowing device 18 at a start of backward traveling of the vehicle 10 is disabled by an ON operation performed by the driver. By this disabling of forced stopping, it is possible to cause driving of the lawn mowing device 18 by an ON operation of the work drive switch 33 when the vehicle 10 travels backward or to maintain driving of the lawn mowing device 18 when the lawn mowing device 18 is being driven. Thus, a lawn mowing work while traveling backward is enabled.
The control system 80 includes the start switch 35, the work drive switch 33, the backward work permission switch 34, and the two operation levers 22 and 23 at left and right, the two lever sensors 50 and 51 at left and right, the two traveling motors 30 and 31 at left and right and the traveling inverters 84 and 86, the two motor speed sensors 54 and 55 at left and right, and the three deck motors 60 and the deck inverters 88, the three deck motor speed sensors 52, and the control device 40. Although only one deck motor 60, one deck inverter 88, and one deck motor speed sensor 52 are illustrated in
The left traveling inverter 84 drives the left traveling motor 30 and the right traveling inverter 86 drives the right traveling motor 31. Each of the traveling inverters 84 and 86 includes, for example, a traveling inverter circuit including three arms each of which includes two switching elements electrically coupled in series, and a traveling inverter control device that controls the traveling inverter circuit.
Actuation of each of the traveling inverters 84 and 86 is controlled by the control device 40. Thus, the left traveling motor 30 is controlled by the control device 40 via the left traveling inverter 84. The right traveling motor 31 is controlled by the control device 40 via the right traveling inverter 86. Therefore, the left traveling motor 30 and the right traveling motor 31 are driven by the control device 40 independently from each other with respect to the direction and the rotation number. Accordingly, the left traveling motor 30 and the right traveling motor 31 independently drive the left wheel 12 and the right wheel 13 with respect to the rotation direction and the rotation number.
Furthermore, detection values of the rotation number n (sec-1) of the left traveling motor 30 are input from the left motor speed sensor 54 to the left traveling inverter control device of the left traveling inverter 84. Detection values of the rotation number n (sec-1) of the right traveling motor 31 are input from the right motor speed sensor 55 to the right traveling inverter control device of the right traveling inverter 86. The two motor speed sensors 54 and 55 at left and right detect the rotation numbers of the two traveling motors 30 and 31 at left and right, respectively. Detection values of the rotation number of each of the motor speed sensors 54 and 55 are output to the control device 40.
Each of the deck inverters 88 drives a corresponding one of the deck motors 60. Similar to the traveling inverter circuit and the traveling inverter control device of each of the traveling inverters 84 and 86, each of the deck inverters 88 also includes a deck inverter circuit and a deck inverter control device that controls the deck inverter circuit.
Furthermore, detection values of the rotation number n (sec-1) of a corresponding one of the deck motors 60 are input from a corresponding one of the deck motor speed sensors 52 to the deck inverter control device of each of the deck inverters 88. Each of the deck motor speed sensors 52 detects the rotation number of the corresponding one of the deck motors 60. Detection values of the rotation number of each of the deck motor speed sensors 52 are output to the control device 40 via a corresponding one of the deck inverters 88. Note that, in
The control device 40 includes an arithmetic unit, such as a CPU or the like, and a storage unit, such as a memory or the like, and is configured of, for example, a microcomputer. The control device 40 acquires operation positions of the two operation levers 22 and 23 from detection signals of the two lever sensors 50 and 51 at left and right to set respective target rotation numbers of the left traveling motor 30 and the right traveling motor 31 in accordance with the respective operation positions of the operation levers 22 and 23.
The control device 40 includes a left lever determination unit 47 to which a detection value is transmitted from the left lever sensor 50 and that determines a current tilt position of the left operation lever 22 from the detection value, and a right lever determination unit 48 to which a detection value is transmitted from the right lever sensor 51 and that determines a current tilt position of the right operation lever 23 from the detection value. As indicated by 5 to 6 in circles in
Furthermore, the vehicle 10 of this example includes a backward work permission switch determination unit 41, a traveling determination unit 42, a work determination unit 43, and a work drive switch determination unit 44. The backward work permission switch determination unit 41 determines whether the backward work permission switch 34 is operated OFF or ON. The traveling determination unit 42 determines a traveling state of the vehicle, that is, whether the vehicle is traveling forward, is traveling backward, or is stopped, or whether the vehicle is turning. At this time, similar to a case that will be described later with reference to a flowchart in
Determination on whether the two wheels 12 and 13 at left and right rotate in the backward direction is performed in accordance with the operation positions of the left and right levers 22 and 23 acquired from the detection signals of the left and right lever sensors 50 and 51 or the rotation directions of the left and right traveling motors 30 and 31 acquired from the detection signals of the left and right motor speed sensors 54 and 55. For example, when the operating position of each of the operation levers 22 and 23 is in the backward direction, it is determined that the two wheels 12 and 13 at left and right rotate in the backward direction and the vehicle is traveling backward. When the rotation directions of the left and right traveling motors 30 and 31 are the backward direction, it is determined that the two wheels 12 and 13 at left and right rotate in the backward direction and the vehicle is traveling backward.
Determination on whether the average speed of the two wheels 12 and 13 at left and right is equal to or higher than the predetermined value in terms of speed in the backward direction is also performed in accordance with the operating positions of the left and right levers 22 and 23 acquired from the detection signals of the left and right lever sensors 50 and 51 or the rotation speeds of the left and right traveling motors 30 and 31 acquired from the detection signals of the left and right motor speed sensors 54 and 55. For example, when the average speed of the two wheels 12 and 13 at left and right is estimated from the respective operating positions of the operation levers 22 and 23 and the average speed is speed (speed in the backward direction) at which the vehicle moves in the backward direction, it is determined that the vehicle is traveling backward. When the average speed of the two wheels 12 and 13 at left and right is estimated from the rotation speeds of the left and right traveling motors 30 and 31 and the average speed is speed in the backward direction and is equal to or higher than the predetermined value, it is determined that the vehicle is traveling backward.
As described above, it is determined that the vehicle is traveling backward not only when both of the two wheels 12 and 13 merely rotate in the backward direction but also when the average speed of the two wheels 12 and 13 is equal to or higher than the predetermined value in terms of speed in the backward direction, and therefore, a turn in which it is difficult for the driver to see a travel direction only by viewing, such as a turn in which the rotation directions of the two wheels 12 and 13 are opposite to each other and the vehicle moves while turning in the backward direction as a whole, is also set as backward traveling. As will be described later, safety can be further enhanced by performing control to forcibly stop driving of the lawn mowing device 18 by backward traveling determination when the backward work permission switch 34 is operated OFF.
The work determination unit 43 determines whether the lawn mowing device 18 is being driven or stopped based on the rotation speeds of the deck motors 60 acquired from the detection signals of the deck motor speed sensors 52. The work drive switch determination unit 44 determines whether the work drive switch 33 is operated OFF or ON.
Information representing corresponding determination results is transmitted to the work control unit 45 from the backward work permission switch determination unit 41, the traveling determination unit 42, the work determination unit 43, and the work drive switch determination unit 44, as indicated by 1 through 4 in the circles in
Second OFF operation control may be performed together with or instead of the first OFF operation control. In the second OFF operation control, in a case where the backward work permission switch 34 is operated OFF and the work drive switch 33 is operated ON, the work control unit 45 forcibly stops the lawn mowing device 18 when the vehicle 10 travels backward. In the second OFF operation control, after the work control unit 45 forcibly stops the lawn mowing device 18, the work control unit 45 controls the lawn mowing device 18 to drive the lawn mowing device 18 only when the vehicle 10 finishes backward traveling, the work drive switch 33 is shifted to OFF operation, and then, is shifted again to ON operation.
With the above-described control system 80, efficiency of a lawn mowing work can be increased. Specifically, by the above-described ON operation control, even when the vehicle 10 travels backward, in a case where the backward work permission switch 34 is operated ON, the lawn mowing device 18 can be driven, so that a lawn mowing work while the vehicle 10 is traveling backward is enabled and the efficiency of the lawn mowing work can be increased. Moreover, by one or both of the first and second OFF operation controls described above, the safety of the vehicle 10 when the backward work permission switch 34 is operated OFF can be further enhanced.
By each of the above-described OFF operation controls, the lawn mowing device 18 is forcibly stopped not only when the vehicle 10 is traveling backward but also when the vehicle 10 is shifted from backward traveling to a stop state. Thus, it is easier for the driver to prevent, in a case where the driver intentionally operates the backward work permission switch 34 to be OFF, an obstacle from approaching the lawn mowing device 18 in operation during backward traveling in which it is harder for the driver to see an area ahead of the vehicle 10 in the travel direction than in forward traveling, so that safety can be further enhanced. It is also possible to prevent the driver from unintentionally and abruptly restarting driving of the lawn mowing device 18 when the vehicle 10 is shifted to a stop state from backward traveling. Moreover, it is also possible to give the driver time to check whether there is an obstacle around the vehicle and other safe conditions before driving of the lawn mowing device 18 is restarted to confirm a safe condition, and thus, to give the driver a higher sense of safety. Thus, safety can be even further enhanced.
In a case where the vehicle 10 travels backward by the second OFF operation control, the lawn mowing device 18 is controlled to be driven only when the vehicle 10 finishes backward traveling and the work drive switch 33 is shifted to OFF operation (4) and then is shifted to ON operation again (5). Thus, in
Specifically, first, in Step S10 of
A, B, and C in
If a determination result is positive (YES) in at least one of Steps S13 to S16, it is determined in Step S18 that the vehicle 10 is traveling backward and the process proceeds to Step S20. In Step S20, driving of the lawn mowing device 18 is forcibly stopped, that is, when the lawn mowing device 18 is being driven, the lawn mowing device 18 is shifted to a stop state and, when the lawn mowing device 18 is in a stop state, the stop state of the lawn mowing device 18 is maintained. On the other hand, if the determination result is negative (NO) in all of Steps S13 to S16, it is determined in Step S17 that the vehicle 10 is not traveling backward and the process proceeds to Step S21. An order of determinations of Steps S13 to S16 of
In Step S21, whether the lawn mowing device 18 is being driven is determined. If a determination result of Step S21 is positive, the process proceeds to Step S24 to drive the lawn mowing device 18 or maintain driving of the lawn mowing device 18. If the determination result of Step S21 is negative, in Step S22, whether switching from the OFF operation to the ON operation that is the ON operation of the work drive switch 33 has been performed after the lawn mowing device 18 stopped is determined. If a determination result of Step S22 is positive, the process proceeds to Step S24 to drive the lawn mowing device 18 or maintain driving of the lawn mowing device 18.
On the other hand, if the determination result of Step S22 is negative, a stop state of the lawn mowing device 18 is maintained. After processes of S25, S23, S24, and S20, the process returns to a process of Step S10.
According to a configuration in which the control method illustrated in
According to a configuration in which the control method illustrated in
Note that a configuration in which, in a determination process of
In the foregoing, a case where the wheels 12 and 13 that are left and right drive wheels are driven by the electric motors has been described, but a configuration in which the left and right drive wheels are driven by hydraulic motors may be employed. In this case, the vehicle may include an engine to drive a hydraulic pump that supplies pressure oil to each of the hydraulic motors. A configuration in which, when the drive wheels are driven by the electric motors, the vehicle includes an engine and power generated by a generator driven by the engine is supplied to the battery to charge the battery may be employed.
A configuration in which, when the above-described configuration of the embodiment is applied to a vehicle in which a steering wheel is used as a turning indicator and an accelerator pedal provided in front of the seat is used as a travel instruction tool (of a single-pedal seesaw type or a two-pedal type), the left and right drive wheels are driven by a single electric motor may be employed. In this case, power of the electric motor is differentially transmitted to left and right axles to which the left and right drive wheels are coupled via a differential device. Therefore, the two drive wheels at left and right are not driven independently. In this case, instead of the backward traveling determination process illustrated in
Number | Date | Country | Kind |
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2022-112435 | Jul 2022 | JP | national |