Work vehicle

Abstract

To provide a work vehicle capable of suppressing cost increase of a system for power generation detection.SOLUTION: A work vehicle includes: an engine control part 22 for controlling the actuation of an engine 10; a power generation part 21 driven by the engine 10; and a display control part 19 for actuating an alarm display 20 when abnormality of the power generation part 21 is discriminated based on a power generation signal from the power generation part 21. When the power generation part 21 is a rectifying system integrated type power generation device in which an AC generator and a rectifying system are formed in an integrated manner, a power generation signal is transmitted to the display control part 19, and the display control part 19 actuates the alarm display 20 based on the power generation signal. When the power generation part 21 is a separation type power generation device 28 in which the AC generator 26 and the rectifying system 27 are provided respectively, the power generation signal is transmitted to the engine control part 22 from the rectifying system 27, and the display control part 19 actuates the alarm display 20 by an instruction from the engine control part 22.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work vehicle equipped with an engine. [Background technology]

[0002] Engine-mounted work vehicles are equipped with a power generator that rotates as the engine rotates and charges the battery. Known power generators include a separate type called a dynamo, which has an AC generator and a rectifier system separately, and an alternator-integrated type called a rectifier system, which has an AC generator and a rectifier system integrated into one unit.

[0003] In a configuration using a separate power generation device (dynamo), for example, as described in Patent Document 1, the detection signal of the dynamo is input to a control device via a rectification system such as a frequency detector, and the control device controls the operation of a display device provided in the driving section. The display device is configured to operate, for example, a warning indicator that displays engine abnormalities, etc., in response to a command from the control device.

[0004] In addition, in a configuration using a rectification system integrated power generation device (alternator), for example, as described in Patent Document 2, the detection signal of the alternator is input to a display control unit that controls the operation of a display device provided in the driving unit, and the display control unit operates a warning indicator that displays engine abnormalities, etc. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-337109 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-14759 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-described conventional configuration, as described above, when a separate-type generator is used as a power generation detection system for detecting the power generation state of a generator, the detection signal is input to different targets, and the control device and display control unit perform different abnormality detection operations depending on the different configurations. As a result, different power generation detection systems must be prepared for each case, which leads to increased costs. Furthermore, when the power generation method is switched from a separate-type generator to a rectifier system-integrated generator due to the need to increase the power generation capacity as a vehicle option, the entire power generation detection system for detecting the power generation state must be changed, resulting in increased costs.

[0007] An object of the present invention is to provide a work vehicle that can suppress an increase in the cost of a power generation detection system. [Means for solving the problem]

[0008] A characteristic configuration of the work vehicle according to the present invention is that it comprises an engine, an engine control unit that controls the operation of the engine, a power generation unit driven by the engine, a warning indicator that warns of abnormalities in the power generation unit, and a display control unit that activates the warning indicator when it determines that there is an abnormality in the power generation unit based on a power generation signal from the power generation unit; when the power generation unit is a rectification system integrated power generation unit in which an AC generator and a rectification system are integrally formed, the power generation signal is sent to the display control unit, and the display control unit is configured to activate the warning indicator based on the power generation signal; and when the power generation unit is a separate type power generation unit in which an AC generator and a rectification system are separately provided, the power generation signal is sent from the rectification system to the engine control unit, and the display control unit is configured to activate the warning indicator in response to instructions from the engine control unit.

[0009] According to the present invention, when the power generation unit is a rectification system-integrated power generation device, a power generation signal is sent to the display control unit. When the display control unit receives a signal indicating a normal power generation signal from the power generation unit, it does not activate the warning indicator. When the power generation unit receives a signal indicating an abnormality as a power generation signal for some reason, the display control unit activates the warning indicator. As a result, the operator is notified of the abnormal state.

[0010] On the other hand, when the power generation unit is a separate power generation unit, a power generation signal is sent from the rectification system to the engine control unit. When the engine control unit receives a signal indicating normality as a power generation signal from the power generation unit, the engine control unit instructs the display control unit not to activate the warning indicator. When the power generation unit receives a signal indicating an abnormality as a power generation signal for some reason, the engine control unit instructs the display control unit to activate the warning indicator. As a result, the operator can be notified of the abnormal condition.

[0011] In this way, regardless of whether the power generation unit is a rectification system integrated power generation unit or a separate power generation unit, it is possible to respond appropriately and notify the operator of an abnormal condition if an abnormality occurs in the power generation unit.

[0012] Therefore, for example, in a work vehicle equipped with a separate power generation device, even if a specification change is made to change the power generation method, such as replacing the power generation unit from a separate power generation device to a rectification system integrated power generation unit, the control device and display control unit can be used as is, and there is no need to make major changes to components, etc., thereby preventing any increase in the cost of the power generation detection system.

[0013] In the present invention, the display control unit is preferably configured to be capable of communicating information with the engine control unit, and to be configured such that when the power generation signal is detected when the engine is started, the display control unit determines that the power generation unit is the rectifier system integrated power generation unit and activates the warning indicator based on the power generation signal, and if the power generation signal is not detected when the engine is started, the display control unit determines that the power generation unit is the separate power generation unit, communicates information with the engine control unit, and activates the warning indicator based on instructions from the engine control unit.

[0014] According to this configuration, the display control unit determines whether the power generation unit is a rectification system-integrated power generation unit or a separate power generation unit depending on whether or not there is a power generation signal, and either activates the warning indicator itself or communicates with the control unit to receive instructions from the control unit. In other words, because the display control unit switches the operating state by its own judgment, additional control on the control unit side can be reduced, and the control configuration can be simplified.

[0015] In the present invention, it is preferable that a battery is provided that is charged with the power generated by the power generation unit, and that a starting device that starts the engine, the engine control unit, and the display control unit are operated using the power from the battery.

[0016] According to this configuration, the battery is charged with power from the power generation unit, and the battery supplies power to the starting device, engine control unit, display control unit, etc. Therefore, if the power generation unit fails, there is a disadvantage that the battery will run out of power and the engine will not start or will not operate normally, but because the warning display unit can appropriately warn of an abnormality in the power generation unit regardless of the type of the power generation unit, such disadvantages can be avoided. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a side view of a utility vehicle. [Figure 2] FIG. [Figure 3] 1 is a block diagram showing a power generation system having a dynamo-type power generation unit. [Figure 4] 1 is a block diagram showing a power generation system having an alternator-type power generation unit. [Figure 5] 10 is a flowchart of a control operation. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of a multipurpose vehicle, which is an example of a work vehicle according to the present invention, will be described with reference to the drawings. Note that the present invention is not limited to the following embodiment, and various modifications are possible without departing from the spirit and scope of the present invention.

[0019] In the following explanation, unless otherwise specified, the direction of arrow F in the figure is "forward," the direction of arrow B is "backward," the direction of arrow L is "left," and the direction of arrow R is "right." The direction of arrow U in the figure is "upward," and the direction of arrow D is "downward."

[0020] [Overall configuration of multipurpose vehicle] The utility vehicle shown in Figure 1 is used for multiple purposes such as transporting luggage and recreation. The utility vehicle is equipped with a body 4 having a body frame 1, front wheels 2 which are a pair of left and right running wheels provided at the front of the body frame 1 in a steerable and drivable manner, and rear wheels 3 which are a pair of left and right running wheels provided at the rear of the body frame 1 in a drivable manner.

[0021] A riding section 5 is provided in a portion of the vehicle body 4 between the front wheels 2 and the rear wheels 3. The riding section 5 is provided with a front riding section 5A and a rear riding section 5B, and a rope rope 6 that surrounds the riding space of the front riding section 5A and the riding space of the rear riding section 5B. The front riding section 5A is provided with a driver's seat 7 and a driver's section 8 located in front of the driver's seat. A luggage rack 9 is provided behind the riding section 5. Below the luggage rack 9 are provided an engine 10 as a power source, a belt-type continuously variable transmission 11 that continuously changes the speed of the power from the engine 10 and outputs it, and a power transmission device 12 that changes the speed of the power from the continuously variable transmission 11 and outputs it to the front wheels 2 and the rear wheels 3.

[0022] The power transmission device 12 has a transmission case 13 and a gear transmission mechanism provided inside the transmission case 13, and is configured to be able to change speeds between a forward transmission state, a neutral state, and a reverse transmission state by shifting the transmission gear.

[0023] In the power transmission device 12, the power input from the continuously variable transmission 11 is changed in speed by a gear transmission mechanism and output toward the front wheels 2 and rear wheels 3. The rear wheel output of the power transmission device 12 is transmitted to a rear wheel differential mechanism (not shown) provided inside the transmission case 13, and then transmitted from the rear wheel differential mechanism to the left and right rear wheels 3. The front wheel output of the power transmission device 12 is transmitted to a front wheel differential mechanism (not shown) by a rotating shaft (not shown) extending forward from the transmission case 13, and then transmitted from the front wheel differential mechanism to the left and right front wheels 2.

[0024] As shown in Figure 2, the driver's section 8 is equipped with a steering wheel 14 for steering the front wheels, which is located in front of the driver's seat 7, a forward / backward swinging gearshift lever 15 located adjacent to the right side of the steering wheel 14, and a display device 16 located adjacent to the right side of the gearshift lever 15 for displaying various information.

[0025] The display device 16 includes a numeric display unit 17 that displays mainly numeric information such as information about the engine 10 and vehicle speed using an LCD display, a warning display unit 18 that has various warning indicator lights illuminated by LED lamps, and a display control unit 19 that controls the operation of the numeric display unit 17 and the warning display unit 18.

[0026] The warning display unit 18 is provided with, for example, a charging warning lamp 20 as a warning indicator that notifies of an abnormality in the charging system. This charging warning lamp 20 lights up when an abnormality occurs in the power generation unit 21, which will be described later. Although not shown, the warning display unit 18 is provided with various warning lamps in addition to the charging warning lamp 20. For example, there are an engine abnormality warning lamp that notifies of an abnormality in the engine, a lubricating oil system abnormality warning lamp that notifies of an abnormality in the lubricating oil system, a fuel warning lamp that warns of low fuel remaining, and the like.

[0027] This vehicle is equipped with an engine control unit 22 that controls the operation of engine 10, and a power generation unit 21 that generates electricity when driven by engine 10. Engine control unit 22 controls the operating state of engine 10 in response to the operation states of a key switch 23, an accelerator pedal (not shown), etc.

[0028] The power generating unit 21 may be either an alternator type power generating unit 25 equipped with an alternator 24 as a rectification system integrated power generating device in which an AC generator and a rectification system are integrally formed, or a dynamo type power generating unit 28 as a separate power generating device equipped with a dynamo 26 as an AC generator and a regulator 27 as a rectification system separately. Either of these types may be adopted.

[0029] The vehicle is provided with a battery 29 that is charged with the power generated by the power generation unit 21, and the power of the battery 29 is supplied to various power systems such as a starting device 30 that starts the engine 10, an engine control unit 22, and a display control unit 19, thereby operating each device.

[0030] When the power generation unit 21 is an alternator-type power generation unit 25, a power generation signal is sent to the display control unit 19, and the display control unit 19 is configured to activate the charging warning light 20 based on the power generation signal; when the power generation unit 21 is a dynamo-type power generation unit 28, a power generation signal is sent from the regulator 27 to the engine control unit 22, and the display control unit 19 is configured to activate the charging warning light 20 in response to instructions from the engine control unit 22.

[0031] The display control unit 19 is capable of communicating information with the engine control unit 22, and is configured to, when the engine 10 starts and a power generation signal is detected, determine that the power generation unit 21 is an alternator-type power generation unit 25 and activate the charging warning light 20 based on the power generation signal; and, when the engine 10 starts and a power generation signal is not detected, determine that the power generation unit 21 is a dynamo-type power generation unit 28, communicate information with the engine control unit 22, and activate the charging warning light 20 in response to an instruction from the engine control unit 22.

[0032] Fig. 3 is a block diagram showing a power generation system having a dynamo-type power generation unit 28, and Fig. 4 is a block diagram showing a power generation system having an alternator-type power generation unit 25. Fig. 5 is a flowchart of the control operation of the display control unit 19.

[0033] 3, when a dynamo-type power generating unit 28 is provided, a dynamo 26 is operated by the rotational power of the engine 10 to generate AC power. The AC power is rectified by a regulator 27 and converted into DC power, which is supplied to a battery 29 to charge the battery 29. Meanwhile, a power generation signal is transmitted from the regulator 27 to the engine control unit 22.

[0034] The engine control unit 22 and the display control unit 19 are configured to be able to communicate control information with each other. By receiving the power generation signal, the engine control unit 22 can confirm that the dynamo 26 is operating to generate electricity. However, if the engine control unit 22 does not receive the power generation signal even though the engine 10 is operating, it determines that there is an abnormality in the charging system and sends instruction information to the display control unit 19 to activate the charging warning light 20.

[0035] 4, when an alternator-type power generating unit 25 is provided, the rotational power of the engine 10 operates the alternator 24 to generate electricity, and the rectified DC power is supplied to the battery 29 to charge the battery 29. Meanwhile, a power generation signal is transmitted from the alternator 24 to the display control unit 19. By receiving the power generation signal, the display control unit 19 can confirm that the alternator 24 is operating to generate electricity.

[0036] Display control unit 19 does not display any warning when a power generation signal is transmitted from alternator 24. However, if no power generation signal is received even though engine 10 is running, it determines that there is an abnormality in the charging system and activates charging warning lamp 20.

[0037] 5, when the display control unit 19 receives a power generation signal (steps #1 and #2) while the engine 10 has started and is rotating, it determines that the power generation unit 21 is the alternator-type power generation unit 25 (step #3). At this time, if the power generation signal continues to be received, no warning display is performed, but if the power generation signal cannot be received, it is determined that there is an abnormality in the charging system and activates the charging warning light 20 (steps #4 and #5).

[0038] When the display control unit 19 does not receive a power generation signal while the engine 10 is running after starting, it determines that the power generation unit 21 is the dynamo-type power generation unit 28 (step #6). At this time, it communicates information with the engine control unit 22 (step #7), and the engine control unit 22 recognizes that power generation is being performed by the dynamo-type power generation unit 28. If the engine control unit 22 continues to receive the power generation signal, it does not display a warning. However, if it is no longer able to receive the power generation signal, it determines that there is an abnormality in the charging system and transmits a warning command from the engine control unit 22 to the display control unit 19. When the display control unit 19 receives the warning command (step #8), it activates the charging warning light 20 (step #5).

[0039] [Another embodiment] (1) In the above embodiment, the display control unit 19 determines the type of the power generation unit 21 based on the presence or absence of a power generation signal from the power generation unit 21 and controls the operation of the charging warning light 20. However, instead of this configuration, the display control unit 19 and the engine control unit 22 may each determine the type of the power generation unit 21 based on the presence or absence of a power generation signal.

[0040] (2) In the above embodiment, the charging warning light 20 illuminated by an LED lamp is used as the warning indicator. However, various configurations may be used, such as a liquid crystal display or a fluorescent display.

[0041] (3) In the above embodiment, the vehicle is provided with front wheels 2 and rear wheels 3, but may be provided with a crawler-type traveling device. [Industrial Applicability]

[0042] The present invention can be applied to various types of work vehicles equipped with an engine in addition to multipurpose vehicles. [Explanation of symbols]

[0043] 10 Engine 19 Display control unit 20 Charging warning lamp (warning indicator) 21 Power Generation Department 22 Engine control unit 25 Alternator-type power generating unit (rectification system integrated power generating device) 26 Dynamo (alternating current generator) 27 Regulator (rectifier system) 28 Dynamo-type power generating unit (separate power generating device) 29 Battery 30 Starting Device

Claims

1. The engine and an engine control unit that controls the operation of the engine; a power generation unit driven by the engine; a warning indicator that warns of an abnormality in the power generation unit; a display control unit that activates the warning indicator when it determines that an abnormality has occurred in the power generation unit based on a power generation signal from the power generation unit, When the power generation unit is a rectification system integrated power generation device in which an AC generator and a rectification system are integrally formed, the power generation signal is transmitted to the display control unit, and the display control unit is configured to operate the warning indicator based on the power generation signal, When the power generation unit is a separate type power generation device in which an AC generator and a rectification system are separately provided, the power generation signal is transmitted from the rectification system to the engine control unit, The display control unit is configured to activate the warning indicator in response to an instruction from the engine control unit.

2. The display control unit capable of communicating information with the engine control unit, When the engine is started and the power generation signal is detected, the power generation unit is determined to be the rectification system integrated power generation unit, and the warning indicator is activated based on the power generation signal; and 2. The work vehicle according to claim 1, wherein if the power generation signal is not detected when the engine is started, the power generation unit is determined to be the separate power generation unit, information is communicated between the power generation unit and the engine control unit, and the warning indicator is activated in response to an instruction from the engine control unit.

3. a battery that is charged by the power generated by the power generation unit is provided; 3. The work vehicle according to claim 1, wherein a starting device for starting the engine, the engine control unit, and the display control unit are operated by power from the battery.

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