JP6781182B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine configured to start an engine based on a start switch start instruction and a wireless authentication device authentication.

Patent Document 1 discloses a hydraulic excavator configured to start an engine based on a start instruction of a start switch and authentication of a wireless authentication device. More specifically, the hydraulic excavator is an engine based on a start switch that outputs an engine start instruction, a wireless authentication device that wirelessly authenticates between the mobile key, and a start switch start instruction and wireless authentication device authentication. It is equipped with a vehicle body controller that outputs a start command. Further, the hydraulic excavator includes an engine control unit (hereinafter referred to as an ECU) and a starter.

The vehicle body controller energizes the coil of the C relay to close the contacts of the C relay. As a result, an electric signal via the contact of the C relay is input to the ECU as an engine start command. The ECU energizes the coil of the starter relay in response to the engine start command to close the contacts of the starter relay. As a result, the starter is driven by being supplied with electric power from the battery through the contacts of the starter relay to start the engine.

Patent Document 2 discloses a hydraulic excavator including an electric device connected to the positive electrode side of a battery and a disconnect switch connected to the negative electrode side (earth side) of the battery. Then, for example, when repairing an electric device or when it is desired to suppress the discharge of the battery while the hydraulic excavator is stopped, the disconnect switch is switched from the closed state to the open state by the operation of the driver. As a result, the connection between the battery and the ground is cut off, and the power supply from the battery to the electric device is cut off.

Japanese Unexamined Patent Publication No. 2016-118033

Japanese Unexamined Patent Publication No. 2016-169482

It is assumed that the disconnect switch of Patent Document 2 is provided for the hydraulic excavator provided with the wireless authentication device of Patent Document 1. More specifically, it is assumed that the wireless authentication device and the like are connected to the positive electrode side of the battery as described in Patent Document 1, and the disconnect switch is connected to the negative electrode side of the battery as described in Patent Document 2. To do. Alternatively, unlike the description in Patent Document 2, it is assumed that the disconnect switch is connected to the positive electrode side of the battery and intervenes between the battery and the wireless authentication device or the like.

In these cases, if the disconnect switch is open when the driver operates the start switch, power is not supplied to the wireless authentication device or the like. Therefore, the certification of the wireless authentication device cannot be obtained, and the engine does not start. Alternatively, if there is a problem in the wireless communication between the wireless authentication device and the mobile key (specifically, if the battery of the mobile key runs out), the authentication of the wireless authentication device cannot be obtained and the engine does not start. Therefore, the driver cannot grasp whether the cause of the engine not starting is the disconnect switch side or the wireless authentication device side.

The present invention has been made in view of the above matters, and an object of the present invention is to grasp whether the cause is on the disconnect switch side or the wireless authentication device side when the engine is not started by operating the start switch. Is to provide construction machinery that can be.

In order to achieve the above object, the present invention comprises a start switch that outputs an engine start instruction, a wireless authentication device that wirelessly authenticates between the mobile key, a start switch start instruction, and the wireless authentication device. In a construction machine including a vehicle body controller that outputs an engine start command based on the certification of the vehicle body controller and an engine start device that starts the engine in response to the engine start command of the vehicle body controller, the wireless authentication device and the vehicle body controller from the battery. A first power supply line that supplies power to the engine, a second power supply line that supplies power from the battery to the engine starting device, and a second power supply line that are provided in a closed state. The vehicle body controller includes a disconnect switch that switches between an open state and switches between supply and non-supply of power from the battery to the engine starting device, and the vehicle body controller has the disconnect switch open or closed. It is determined whether or not the switch is present, and when it is determined that the disconnect switch is in the open state, a display device is displayed to that effect.

According to the present invention, when the engine is not started by the operation of the start switch, it is possible to grasp whether the cause is on the disconnect switch side or the wireless authentication device side.

It is a side view which shows the structure of the hydraulic excavator in one Embodiment of this invention. It is a figure which shows the structure of the electric circuit of the hydraulic excavator in one Embodiment of this invention. It is a flowchart which shows the processing procedure of the vehicle body controller in one Embodiment of this invention.

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing the structure of the hydraulic excavator in the present embodiment. After that, the front side (left side in FIG. 1), the rear side (right side in FIG. 1), the left side (front side with respect to the paper in FIG. 1), and the right side (left side in FIG. 1) and the right side (front side in FIG. The back side with respect to the middle paper surface in FIG. 1) is simply referred to as a front side, a rear side, a left side, and a right side.

The hydraulic excavator of the present embodiment includes a crawler type lower traveling body 1 and an upper swivel body 2 provided so as to be swivel above the lower traveling body 1, and the lower traveling body 1 and the upper swivel body 2 are provided. It constitutes the car body. The lower traveling body 1 travels by the traveling motor, and the upper rotating body 2 rotates by the rotating motor.

A working device 3 is connected to the front side of the upper swivel body 2. The work device 3 includes a swing post 4 rotatably connected to the front side of the upper swing body 2 in the left-right direction, a boom 5 rotatably connected to the swing post 4 in the up-down direction, and a boom 5 in the up-down direction. An arm 6 rotatably connected to the arm 6 and a bucket 7 rotatably connected to the arm 6 in the vertical direction are provided. The swing post 4, boom 5, arm 6, and bucket 7 are rotated by a swing cylinder, a boom cylinder 8, an arm cylinder 9, and a bucket cylinder 10, respectively.

The upper swivel body 2 includes a swivel frame 11 forming a basic structure, a cab type cab 12 provided on the left side of the swivel frame 11, and a fuel tank and a hydraulic oil tank provided on the right side of the swivel frame 11 (FIG. (Not shown) and a counterweight 13 provided at the rear end of the swivel frame 11.

A machine room is formed between the driver's cab 12 and the counterweight 13, and the engine 14 and the hydraulic pump 15 driven by the engine 14 are provided in the machine room. The plurality of hydraulic actuators (specifically, a traveling motor, a swivel motor, a swing cylinder, a boom cylinder 8, an arm cylinder 9, and a bucket cylinder 10) described above are driven by pressure oil from the hydraulic pump 15. ..

Next, the electric circuit of the hydraulic excavator of this embodiment will be described. FIG. 2 is a diagram showing a configuration of an electric circuit of a hydraulic excavator according to the present embodiment. FIG. 3 is a flowchart showing a processing procedure of the vehicle body controller in the present embodiment.

The electric circuit of this embodiment includes a battery 20, a wireless authentication device 21, a start switch 22, a monitor 23 (display device), a vehicle body controller 24, an engine control unit (hereinafter referred to as an ECU) 25, a starter 26, and an electrical component 27 (details). Is provided with, for example, a light) and a disconnect switch 28. The wireless authentication device 21 authenticates with a mobile key (authentication key) 29 possessed by the driver, and includes an authentication controller 30 and an antenna 31. The battery 20, the disconnect switch 28, and the starter 26 are arranged in the above-mentioned machine room, and the wireless authentication device 21, the start switch 22, and the monitor 23 are arranged in the above-mentioned driver's cab 12.

Power supply lines 32A, 32B, and 32C are connected to the positive electrode side of the battery 20. The power supply line 32A supplies power from the battery 20 to the monitor 23, the vehicle body controller 24, and the authentication controller 30 of the wireless authentication device 21. The power supply line 32B supplies power from the battery 20 to the starter 26 via the contacts of the starter relay 33. The power supply line 32C supplies power from the battery 20 to the ECU 25 and the electrical component 27 via the contacts of the power relay 34. The ECU 25 and the starter 26 constitute an engine starting device for starting the engine in response to the engine starting command of the vehicle body controller described in the claims.

Although the disconnect switch 28 does not intervene in the power supply line 32A (in other words, between the battery 20 and the monitor 23, the vehicle body controller 24, and the authentication controller 30 of the wireless authentication device 21), the power supply lines 32B and 32C (in other words, in other words). For example, it is provided so as to intervene between the battery 20 and the ECU 25, the starter 26, and the electrical component 27). Then, the driver switches the disconnect switch 28 between the closed state and the open state, so that the supply and non-supply of electric power from the battery 20 to the ECU 25 and the electrical component 27 can be switched.

The vehicle body controller 24, the ECU 25, and the authentication controller 30 each have an arithmetic control unit (for example, a CPU) that executes arithmetic processing or control processing based on a program, and a storage unit (for example, ROM) that stores the results of the program or arithmetic processing. , RAM) and the like. The vehicle body controller 24, the ECU 25, and the authentication controller 30 are connected together with the monitor 23 so as to be able to communicate with each other via a communication line (CAN: Controller Area Network).

The start switch 22 is composed of, for example, a push switch, and outputs an instruction signal to the vehicle body controller 24 by the operation of the driver. As a result, for example, when the engine 14 is stopped and the ECU 25 and the electrical component 27 are not energized, a start instruction for instructing the start of the engine 14 and the energization of the ECU 25 and the electrical component 27 is output, and the engine 14 is in the driving state and the ECU 25 is energized. And in the energized state of the electrical component 27, a stop instruction for instructing the stop of the engine 14 and the de-energization of the ECU 25 and the electrical component 27 is output.

When the activation instruction is input from the activation switch 22 (step S101 in FIG. 3), the vehicle body controller 24 activates the monitor 23 and outputs an access command to the authentication controller 30 of the wireless authentication device 21. (Step S102 in FIG. 3). The authentication controller 30 of the wireless authentication device 21 transmits a request command via the antenna 31 in response to an access command from the vehicle body controller 24.

The mobile key 29 is adapted to transmit an ID code to the wireless authentication device 21 in response to a request command from the wireless authentication device 21. Although not shown, the mobile key 29 includes a receiver for receiving a request command, a transmitter for transmitting an ID code, a microcomputer for controlling the receiver and the transmitter, a receiver, a transmitter, and a transmitter. It has a battery that supplies power to the microcomputer and a transponder with an ID code set.

The authentication controller 30 of the wireless authentication device 21 determines that the authentication is correct when the valid ID code is received from the mobile key 29 via the antenna 31, and determines that the authentication is not performed when the valid ID code is not received. The authentication result is output to the vehicle body controller 24.

When the authentication result is input from the wireless authentication device 21 (step S103 in FIG. 3), the vehicle body controller 24 determines whether the authentication result is positive authentication (in other words, whether the authentication of the wireless authentication device 21 is obtained). Whether or not) is determined (step S104 in FIG. 3). The vehicle body controller 24 has come to determine whether or not the disconnect switch 28 is in the open state when the activation instruction of the activation switch 22 (step S101 described above) and the authentication of the wireless authentication device 21 are obtained. (Step S105 in FIG. 3). More specifically, the current input line 35 is branched from the downstream of the disconnect switch 28 of the power supply lines 32B and 32C and is connected to the vehicle body controller 24. The vehicle body controller 24 determines whether or not the disconnect switch 28 is in the open state based on whether or not the current from the current input line 35 is less than a preset threshold value.

When the vehicle body controller 24 determines that the disconnect switch 28 is not in the open state (that is, in the closed state), the coil of the power relay 34 is energized to close the contacts of the power relay 34 (FIG. 3). Step S106). As a result, the ECU 25 and the electrical component 27 are supplied with electric power from the battery 20 via the contacts of the disconnect switch 28 and the power relay 34. Further, the vehicle body controller 24 outputs an engine start command to the ECU 25 (step S107 in FIG. 3). The ECU 25 energizes the coil of the starter relay 33 in response to an engine start command from the vehicle body controller 24 to close the contacts of the starter relay 33. As a result, the starter 26 is driven by being supplied with electric power from the battery 20 via the contacts of the disconnect switch 28 and the starter relay 33 to start the engine 14.

When the vehicle body controller 24 determines that the disconnect switch 28 is in the open state, the vehicle body controller 24 outputs a display command indicating that fact to the monitor 23 (step S108 in FIG. 3). As a result, for example, a message or mark indicating that the disconnect switch 28 is in the open state is displayed on the monitor 23 for a predetermined time set in advance.

As described above, in the present embodiment, the disconnect switch 28 is interposed in the power supply lines 32B and 32C on the ECU 25, the starter 26, and the electrical component 27 side, but the wireless authentication device 21, the monitor 23, and the vehicle body controller 24. It does not intervene in the power supply line 32A on the side. That is, the wireless authentication device 21, the monitor 23, and the vehicle body controller 24 are supplied with power from the battery 20 regardless of whether or not the disconnect switch 28 is in the open state.

Then, when the engine 14 is not started by the operation of the start switch 22, if the disconnect switch 28 is in the open state, the monitor 23 displays that fact. As a result, the driver can understand that the cause of the engine 14 not starting is on the disconnect switch 28 side. On the other hand, if the engine 14 is not started by the operation of the start switch 22 and the disconnect switch 28 is in the closed state, the display of the monitor 23 described above is not performed. At this time, if the monitor 23 is activated, it can be determined that the monitor 23 and the vehicle body controller 24 have not failed. Therefore, the driver can understand that the cause of the engine 14 not starting is on the wireless authentication device 21 side.

In the above description, the case where the present invention is applied to a hydraulic excavator has been described as an example, but the present invention is not limited to this, and the present invention may be applied to other construction machines (specifically, for example, a wheel loader). Good.

20 Battery 21 Wireless authentication device 22 Start switch 23 Monitor 24 Body controller 25 Engine control unit 26 Starter 28 Disconnect switch 29 Mobile key 32A Power supply line (first power supply line)
32B, 32C power supply line (second power supply line)
33 Starter relay 35 Current input line

Claims (3)

A start switch that outputs an engine start instruction, a wireless authentication device that wirelessly authenticates between the mobile key, and a vehicle body that outputs an engine start command based on the start switch start instruction and the authentication of the wireless authentication device. In a construction machine provided with a controller and an engine starting device for starting an engine in response to an engine starting command of the vehicle body controller.
A first power supply line that supplies power from the battery to the wireless authentication device and the vehicle body controller,
A second power supply line that supplies power from the battery to the engine starter,
It is provided between the second power supply line and includes a disconnect switch that switches between a closed state and an open state to switch between supply and non-supply of power from the battery to the engine starting device.
The vehicle body controller is characterized in that it determines whether the disconnect switch is in the open state or the closed state, and when it is determined that the disconnect switch is in the open state, the display device displays to that effect. Construction machinery to do. In the construction machine according to claim 1,
When the activation instruction of the activation switch and the authentication of the wireless authentication device are obtained, the vehicle body controller determines whether the disconnect switch is in the open state or the closed state, and the disconnect switch is opened. A construction machine characterized in that, when it is determined that the state is in a state, the display device is displayed to that effect for a predetermined time set in advance. In the construction machine according to claim 1,
A power input line branched from the downstream of the disconnect switch of the second power supply line and connected to the vehicle body controller is provided.
The vehicle body controller is characterized in that it determines whether the disconnect switch is in the open state or the closed state based on whether or not the current from the power input line is less than a preset threshold value. machine.

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