KR100734878B1 - Controller for work vehicle - Google Patents

Abstract

Provided is a control device for a work vehicle which enables the cause of an occurrence of a cause of an overcurrent easily when the overcurrent abnormality is generated in an electric circuit.

A control device for a work vehicle having an electric circuit for controlling a working machine (3) and a drive actuator (49, 46, 45) such as a running machine and equipped with a protective device for an overcurrent, 11 to 19, and these circuit breakers 11 to 19 are installed concentrically at predetermined positions of the vehicle body.

Description

[0001] CONTROLLER FOR WORK VEHICLE [0002]

1 is a side view of a hydraulic excavator to which the present invention is applied.

2 is a perspective view of a CB box and a mounting portion of a battery according to the present invention.

3 is a circuit block diagram of a control apparatus having an electric circuit using the CB of the present invention.

4 is a side view showing another embodiment of the installation position of the CB box.

Fig. 5 is a plan view of Fig. 4. Fig.

6 is an explanatory diagram of the CB box.

DESCRIPTION OF THE REFERENCE NUMERALS (S)

2 … The upper swing body 2a ... Turning frame

3 ... Work machine 4 ... Cab

5, 6 ... Step cover 7 ... battery

8 … Step plate 8a ... step

10 ... CB box 11 ~ 19 ... CB

20 ... Fuse box 31 ... Start switch

32 ... Battery relay 33 ... Wiper motor

34 ... Working machines etc 35 ... headlight                 

36 ... Electric feed pump 37 ... Pump controller

38 ... Engine controller 39 ... Monitor device

41 ... Travel solenoid valve 42 ... Swing solenoid valve

43 ... Cutoff canceling solenoid valve 44 ... Torque control solenoid valve

45 ... Driving motor 46 ... Swing motor

47 ... Variable displacement hydraulic pump 48 ... Switching valve

49 ... Hydraulic cylinders for working machines 51 ... sensor

52 ... Interlock switch 61 ... Injector

62 ... Feed pump

The present invention relates to a control device for a work vehicle capable of improving maintenance management such as fault diagnosis when an overcurrent due to a short circuit load is broken.

BACKGROUND ART [0002] In recent work vehicles, a control device for controlling an actuator based on an electric signal is widely used in order to realize high performance, high performance and high maintenance management. These control devices include a controller which is constituted by a computer as a main body, performs predetermined arithmetic processing on the basis of detection signals of various sensors, and outputs a control command in accordance with the calculation result, And a driving device for driving the various actuators in response to the control command. In addition, in order to protect the controller, each driving device, each actuator, and the wiring from excessive current from flowing when a failure of various sensors or various actuators, a short circuit of the wiring to these devices, An overcurrent protection function such as a current limiting circuit and a fuse, and a protective device are provided.

In the case of a construction machine, a fuse is provided at a predetermined place so as to be replaceable with an ordinary one that melts and blocks when an overcurrent flows, thereby protecting the circuit.

If a part of the circuit load fails and an overcurrent flows due to a short circuit, the fuse of the circuit is melted and blocked to protect the circuit. In this case, a field engineer (so-called service man) can identify the cause of the failure and replace the fuse with an alternative fuse to use the control device again.

However, in the circuit protection method using the fuse as described above, the following problems arise.

If the fuse is melted and blocked, it is a normal procedure for the field engineer to replace the fuse with a new one after determining the cause of the fault. However, in recent control devices, many loads (actuator driving circuits and sensors, etc.) are often connected to one control device in order to realize high performance, high performance, and high maintenance performance. The load path is complicated, and the multiple paths are branched. Therefore, it is difficult to immediately identify the cause of the failure in a short period of time. On the other hand, in order to determine the cause of the failure, the fuse is temporarily replaced and the power supply of the control apparatus is turned on again. Therefore, until the real cause is finally known, the power is turned on several times, and a plurality of fuses are melted and blocked. As a result, a large number of preliminary fuses are required, which increases the maintenance cost and, in the case where there is no preliminary fuse at the time of fault repair, it is very difficult to find the cause of the fixing.

Particularly, in the case of a vehicle failure at a place distant from a service center having a field engineer, such as a crushing field in a deep mountain, it takes time for a field engineer to travel between the field engineer and the service center, It is required to complete repairing the fault only by performing the operation at the site as much as possible. For this reason, it is necessary to grasp the fault situation in detail, to estimate the cause of the fault, to fully leave the repair parts, etc., and to leave the site, and to inform the operator of the vehicle when the power is turned on several times It may be necessary. At this time, since the fuse is hardly provided by the power supply re-supply in many cases, the fault situation can not be grasped in detail, and as a result, the field engineer increases the number of round trips between sites, there is a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides a control apparatus for a work vehicle in which when an overcurrent abnormality is generated in an electric circuit of a control apparatus, Purpose.

In order to achieve the above object, a first invention of a control apparatus for a working vehicle according to the present invention is a control apparatus for a working vehicle, comprising: a working vehicle having an electric circuit for controlling a driving actuator such as a working machine and a running vehicle, In the control device, the protective device has a circuit breaker, and the protection circuit breaker is installed concentrically at a predetermined position of the vehicle body.

According to the first invention, even if the circuit breaker is tripped due to the overcurrent of the load, the power supply can be immediately turned on again after the power supply is turned on several times, so that the fault situation can be grasped easily and the trouble diagnosis can be easily performed. In addition, there is a case in which the circuit breaker is not tripped, and the vehicle can be moved and moved without using any function (for example, when only one of the actuators is not driven). In this case, It is possible to move to a place close to the service center, which makes it easier to repair. Further, since the circuit breaker is installed concentrically at a predetermined position, the circuit breaker is easily operated, and maintenance is very good.

The second invention is based on the first invention, wherein the circuit breaker is provided in the vicinity of a power source battery.

According to the second invention, the distance between the circuit breaker and the power source battery is shortened, and the number of circuit parts protected by the circuit breaker can be increased. Therefore, reliability and maintenance of the electric circuit can be improved.

A third invention is characterized in that, in the first invention, the electric circuit provided with the circuit breaker is a power supply circuit to a controller such as a monitor device, an engine controller, and a pump controller.

According to the third invention, in order to investigate whether any one of the plurality of current loads causes a short circuit when the circuit breaker of the control device to which a large number of current loads are connected, such as the monitor device, the engine controller and the pump controller, It is possible to grasp the fault situation by turning on the power again. Therefore, it is possible to greatly facilitate the repair of these devices. It is economical because it is completed without a plurality of spare fuses as in the prior art.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, a hydraulic excavator will be described as an example of a working vehicle.

1 is a side view of a hydraulic excavator to which the present invention is applied. The hydraulic excavator shown in Fig. 1 is provided with a lower traveling body 1 that is driven and driven by a traveling motor controlled by receiving pressure oil from a hydraulic pump rotating by the power of an engine (not shown). An upper cruising body 2 is pivotally mounted on a substantially central portion of the lower cruising body 1 and is swiveled by a swing motor (not shown). A work machine 3 such as a boom, an arm, and a bucket is vertically swingably mounted on a substantially central portion of the upper portion of the upper swing body 2 on the revolving frame 2a. A hydraulic cylinder (boom cylinder 3a) And the like). A cab 4 is mounted on the front left end of the revolving frame 2a and a battery 7 is provided on the right front of the revolving frame 2a. A first step cover 5 is provided above the battery 7 so as to be openable and closable, and covers the upper portion of the battery 7. Further, the first step cover 5 may be rotatable in the front-rear direction or the left-right direction to be openable and closable. A second step cover 6 is provided behind the first step cover 5 so as to incline rearward upward and the inner frame 9 covered with the second step cover 6 is provided with a circuit breaker Box (hereinafter referred to as a CB box) 10 is provided. A predetermined number of circuit breaker (hereinafter referred to as CB) for overcurrent protection of the power supply circuit of the control device is provided in the CB box 10 as will be described later in detail. A rail 5b is provided at the lateral end of the upper surface of the step covers 5,

2 is a perspective view of the CB box 10 and the battery 7 mounting portion. As shown in Fig. 2, a step plate 5a is fixedly attached to the upper surface portion (the upper side of the battery 7) of the first step cover 5. A hole 6a is formed in the second step cover 6 on the front side of the CB box 10 and the step plate 8 covers the hole 6a, As shown in Fig. The step plate 8 is provided with a concave portion provided with a step 8a.

3 is a circuit block diagram of a control apparatus having an electric circuit using the CB according to the present invention. Hereinafter, for the sake of simplicity of explanation and ease of understanding, it is assumed that the connection of the power supply circuit is functionally (mainly) explained.

In the figure, the output voltage of the battery 7 is inputted to the terminal B of the start switch 31 via the CB 11 in the CB box 10, and when the start switch 31 is turned on, And is applied to the exciting coil 32c of the battery relay 32. [ The excitation current of the battery relay 32 returns to the negative voltage terminal of the battery 7 (normally, the vehicle body ground). When the battery relay 32 is turned on, the power supply current from the battery 7 is supplied from the output (a) contact 32a (standard open) of the battery relay 32 to each of the CBs 12 and 13 The wiper motor 33 (for the window of the cab 4), the working machine 34 (illuminating the front of the working machine 3), the headlight 35 via the wiper motor 33, 14, 15, 16 and 17, (A vehicle body headlight), an electric feed oil pump 36, a pump controller 37 (which controls a hydraulic pump for the hydraulic actuator for driving the vehicle 3 and the vehicle drive) The fuses 21, 22, and 23 are supplied.

The fuses 21, 22, and 23 are supplied with power from an air conditioner, a heater, a horn 68, a radio, and a window washer motor.

The output voltage of the battery 7 directly passes through the CBs 18, 19 and 17a in the CB box 10 to control the engine controller 38 (the number of revolutions of the engine is controlled efficiently and precisely) The fuse 25 or 26 or the like is applied to the fuse 25 or 26 or the like in the fuse box 20 and the monitor device 39 (having the function of the machine interface) And for the illumination of the covers 5 and 6).

The current load of the pump controller 37 includes a traveling solenoid valve 41 and a swing solenoid valve 42 for controlling the driving of the traveling motor 45 and the swinging motor 46 and the traveling motor 45, The output torque of the variable displacement hydraulic pump 47 that supplies the pressure oil through the control valve 48 to the hydraulic cylinder 49 for the work machine (the cylinder for the boom 3a, etc.) A cutoff cancel solenoid valve 43 and a torque control solenoid valve 44 for controlling the road are connected and these solenoid valves 41, 42, 43 and 44 are controlled by the pump controller 37 It is controlled by command current. The pump controller 37 is also supplied with signals from the sensors 51 such as various pressure sensors and pressure switches, switch signals from the interlock switch 52 for controlling the actuators and from the clogging sensor 64 of the air cleaner of the engine And a detection signal of the detection signal.                     

The injector 61 (the fuel injection valve of the engine), the feed pump 62 (which feeds the fuel), and the injector 61 (the fuel injection valve of the engine) are used as the current load of the engine controller 38 (which controls the revolution speed of the engine with high efficiency and high accuracy) A sensor 63 such as engine speed, various pressures, oil temperature, and water temperature is connected. The injector 61 and the feed pump 62 are controlled by the control command current from the engine controller 38. [

The start switch 65 is supplied with a power supply current directly from the C terminal of the start switch 31 when the start switch 31 is turned on.

The wiper motor 33, the horn 68 and the buzzer 67 (used for alarm alarms during running, alarms for working machine alarms, etc.) are connected to the monitor device 39, (39).

Each of the CBs 11 to 17a and 19 has a cutoff characteristic between a current value (rated current value) and an operation time at the time of trip according to the maximum load current in the corresponding circuit. These CBs also have a trip switch of the type that returns when the overcurrent flows and is tripped (in other words, protrudes outward from the CB main body). After tripping, the power can be turned on again by pressing this trip switch. These CBs are suitable for use environment conditions such as vibration, impact, ambient temperature, and the like at the time of operation of the working vehicle. Further, since the trip switch at the time of return is employed, it is possible to downsize it and is suitable at the time of vehicle loading.

According to the above configuration, the control device, the driving device, and the power supply circuit of the electric device are protected by the overcurrent protection circuit of the control device. Even if an overcurrent occurs due to a short circuit failure of any one of the loads, And it is also possible to immediately turn on the power supply for troubleshooting. At this time, as described in the prior art, it is not necessary to prepare a plurality of spare fuses, and power can be supplied several times, so that fault diagnosis can be easily performed and it is also very economical. Particularly, in order to enhance and precisely control the control function, a circuit according to a control device such as a pump controller 37, an engine controller 38, and a monitor device 39, to which a plurality of current loads such as actuators and sensors are respectively connected, Even if an overcurrent abnormality occurs, it is also possible to instantly remove the current load connected to the control device and to immediately check the failure situation after turning on the corresponding CB and turning on the power again. Therefore, .

Since the CB box 10 is disposed in the vicinity of the power source battery 7 and the wiring distance between the CB box 10 and the battery 7 is shortened, ) Can be widened, and reliability can be enhanced. Further, since the CB box 10 can be easily opened and closed from the outside, and the CB is installed at a position where the CB can be easily operated, workability in repairing is good.

In addition, for example, when a short circuit occurs between the motor coil and the case inside the electric motor feed pump 36 and the motor feed pump 36 is operated, The CB 15 can be turned on again to turn on the power supply and move the work vehicle in a state in which the electric feed pump 36 is not operated to move it to a predetermined service point. This makes it possible to perform fault repair more easily.

In addition, the position for installing the CB box 10 is not limited to the above-mentioned position, but may be a place where other workers can easily contact. 4 to 6 show another embodiment in which the CB box 10 is installed and a space is formed between the cab 4 and the hydraulic oil tank 71 provided at the rear of the cab 4, The CB box 10 may be provided in this space. The CB box 10 is disposed so as to facilitate the operation of pushing the trip switch after each CB is tripped. In front of the CB box 10 in this operating direction (i.e., A maintenance maintenance cover 72 that can be opened and closed is provided on the vehicle side.

By providing the CB box 10 immediately behind the cab 4, the worker's contact from the cab 4 becomes very good, so that workability at the time of fault diagnosis is good.

In addition, CB may be applied only to any equipment which is required to perform power source re-insertion a plurality of times, and a fuse may be applied other than the above. CB is not limited to having a return trip switch, and may be a circuit breaker.

According to the present invention, since CB is provided in the power supply circuit of the working vehicle, when a short-circuit failure occurs, the power supply can be re-applied several times as many times as necessary, and the fault symptom can be grasped immediately. Further, it is possible to accurately carry out the cause of the failure in a short period of time, and to improve the maintenance performance.

Claims (3)

A control device for a work vehicle having an electric circuit for controlling a working machine (3) and a drive actuator (49, 46, 45) such as a running machine and equipped with a protective device for an overcurrent, 11. The control device for a work vehicle according to claim 10, wherein the circuit breakers (11-19) are arranged in a predetermined position of the vehicle body and are provided in the vicinity of the power supply battery (7). delete The electric circuit according to claim 1, characterized in that the electric circuit provided with the circuit breakers (11 to 19) is a power supply circuit to a controller such as a monitor device (39), an engine controller (38) A control device for the working vehicle.

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