KR20130086872A - Engine start safety appratus for construction equipment - Google Patents

Abstract

PURPOSE: An engine start safety device for construction equipment is provided to normally drive by operating an auxiliary driving device when a main driving device is malfunctioned. CONSTITUTION: An engine start safety device for construction equipment comprises a main driving switch (30), an auxiliary driving switch (80), a controller (20), a driving unit, a starting motor (40), and a starting controller (110). The main driving switch and the auxiliary driving switch output a signal for determining a driving direction. The controller outputs the signal for determining the driving direction according to the operation of the main driving switch. The driving unit is connected to the main driving switch by the controller and is directly connected to the auxiliary driving switch. The starting motor is driven by driving power receiving from a first starting relay when a key start of a driver is operated. The signal outputted by the auxiliary driving switch is inputted in one side of the starting controller. The starting controller applies the signal to a switching terminal of the first starting relay according to the operation of the key start of the driver so that driving power can be applied to the starting motor. The starting controller stops the starting motor by controlling the first starting relay when the key start is operated in a state where the auxiliary driving switch is operated to a driving position.

Description

Starting safety devices for construction machinery {ENGINE START SAFETY APPRATUS FOR CONSTRUCTION EQUIPMENT}

The present invention relates to a starting safety device for a construction machine, and more particularly to a starting safety device for a construction machine in which a starting safety function can be implemented in the same manner as a conventional traveling device even when the auxiliary driving device is provided. .

A traveling system of a conventional construction machine is designed to select forward and backward through a Forward Neutral Reverse (FNR) lever 2 attached to a steering column 1 as shown in FIG. 1.

When the driving system of such construction machine is inadvertently operated by the driver while the FNR lever 2 is operated in the forward or reverse direction, the construction machine starts to move forward and backward regardless of the driver's will at the same time as safety is started. There is a possibility of causing an accident. In order to solve this problem, conventionally, when the FNR lever 2 is operated in the forward or backward direction, when the key start proceeds, the safety device is provided so as not to start the vehicle.

On the other hand, in recent years, in order to facilitate the driver's operation or to prepare for a problem in the main driving system, a technology for installing an auxiliary FNR switch in addition to the above-described FNR lever is being developed. Even when the auxiliary FNR switch is installed in this way, it is necessary to prevent driving from starting at the same time as starting up and causing a safety accident. However, in order to secure such a safety function even when the auxiliary FNR switch is added, the same structure as that for the safety function of the existing FNR switch needs to be additionally secured, resulting in a complicated structure and a complicated control. In addition, durability that must be ensured even in the frequent operation of the auxiliary FNR switch, the structure and control that ensures durability even if somewhat complicated for the implementation of the above-described safety function is required. Therefore, a safety device of simpler and more stable structure is needed.

The present invention has been made to solve the above problems, and an object thereof is to provide an auxiliary traveling device with a simple structure and to provide a starting safety device for a construction machine that can effectively prevent safety accidents.

To this end, according to the first aspect of the present invention, the starting safety device of a construction machine according to the present invention, the main travel switch for outputting a signal for determining the driving direction by the driver's operation; An auxiliary traveling switch provided separately from the main driving switch and outputting a signal for determining a driving direction by an operation of the driver; A controller for outputting a signal for determining the travel direction in response to an operation of the main travel switch; Traveling means connected to the main travel switch and the controller and directly connected to the auxiliary travel switch; A starter motor driven by driving power through a first start relay when a driver starts a key start; A start controller outputs a signal output by the operation of the auxiliary travel switch to one side and applies a signal to a switching terminal of the first start relay in response to a key start operation of a driver to apply the driving power to the start motor. And the start controller is configured to prohibit driving of the start motor by controlling the first start relay when the key start operation is performed while the auxiliary travel switch is operated to the travel position.

 The start safety device of the construction machine may include an auxiliary start relay installed between the auxiliary travel switch and the start controller to change a signal input to the start controller in response to whether the auxiliary travel switch is operated. The start controller may be configured to prohibit driving of the start motor even when the key start operation is performed when it is confirmed that the auxiliary travel switch is operated by the auxiliary start relay.

The starting safety device of the construction machine further includes a second starting relay switched by a signal input from the controller to control a signal applied to a switching terminal of the first starting relay, wherein the second starting relay When the main driving switch is operated in the key-on state, the driving power applied to the starting motor is cut off even when the key start operation is performed by changing a signal input to the switching terminal of the first starting relay, and the first starting The relay is blocked from applying the driving power to the starter motor by the driving of the second start relay when the key start operation is performed while the main drive switch is operated, and the auxiliary drive switch is operated. The driving power by the start controller when the key start operation is performed in It characterized in that the block is to be applied to the starter motor.

The start safety device of the construction machine, The auxiliary driving select switch for connecting one of the signal output from the auxiliary driving switch and the signal output from the controller by the operation of the main driving switch; further comprising a; It is characterized by.

According to the present invention, when a defect occurs in the main traveling device, the auxiliary traveling device is operated to enable normal driving.

According to the present invention, since the circuit configuration of the auxiliary traveling device is possible only by adding a switch and a relay in the existing circuit, there is an effect that it is possible to minimize the cost increase.

1 is a view showing an FNR lever of a traveling system of a conventional construction machine.
2 is a diagram illustrating an example of a start safety device of a construction machine equipped with an auxiliary FNR switch according to an embodiment of the present invention.
3 is a circuit diagram of a start safety device of a construction machine according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The configuration of the present invention and the operation and effect thereof will be clearly understood through the following detailed description.

Prior to the detailed description of the present invention, the same components will be denoted by the same reference numerals even if they are displayed on different drawings, and the detailed description will be omitted when it is determined that the well-known configuration may obscure the gist of the present invention. do.

2 is a view showing an example of a start safety device of a construction machine equipped with an auxiliary FNR switch according to an embodiment of the present invention. The main focus is on enabling the same start-up safety functions.

The starting safety device of the construction machine according to the present invention has a form in which an auxiliary FNR switch 3 is added to the joystick of the main traveling system, as shown in FIG. 2. (b) is a side view of the joystick to which the auxiliary FNR switch 3 is attached, and (c) is a front view of the joystick to which the auxiliary FNR switch 3 is attached.

3 is a circuit diagram of a start safety device of a construction machine according to an embodiment of the present invention.

The electronic control unit (ECU) 10 is an electronic control device for controlling a state of an engine, an automatic transmission, and an ABS of a vehicle by a computer, and is connected to the controller 20.

The controller 20 receives a key on or key start signal and is connected to the main travel switch 30, the ECU 10, and the second start relay 70. The controller 20 is also connected to the travel solenoid 50 via an auxiliary travel selection switch 90.

The controller 20 checks whether the start state of the construction machine is a key-on state or a key start state, receives a signal for the driving direction from the main drive switch 30, and the ECU 10 and the second start relay 70. To control. More specifically, when the controller 20 receives the forward or backward signal from the main travel switch 30 when the start state of the construction machine is the key on state, the controller 20 sends a fuel cutoff signal to the ECU 10 to inject fuel. At the same time, the start motor 40 is not operated by controlling the second start relay 70 to cut off power input to the first start relay 60.

In addition, when the start state of the construction machine is a key start state, the controller 20 controls a valve of the travel solenoid 50 according to the input signal when receiving a signal for the travel direction from the main travel switch 30.

The main driving switch 30 is connected to the controller 20, and is connected to the second start relay 70 and the driving solenoid 50 through the controller 20, and determines the driving direction by the driver's operation. Output the signal.

The starter motor 40 is an electric motor for starting the engine of the vehicle and is connected to the first starter relay 60 to be driven by receiving driving power.

The driving solenoid 50 is connected to the auxiliary driving select switch 90, and receives a signal for the driving direction from the main driving switch 30 or the auxiliary driving switch 80 according to the selective connection of the auxiliary driving select switch 90. It controls the driving direction (forward or backward) by input.

The first start relay 60 transfers the driving power to the start motor 40 by driving the second start relay 70 when the key start operation is performed while the main travel switch 30 is operated. Blocks authorization In addition, the first start relay 60 applies the driving power to the start motor 40 by the start controller 110 when the key start operation is performed while the auxiliary travel switch 80 is operated. Block doing

The second start relay 70 is switched by a signal input from the controller 20 to interrupt a signal applied to the switching terminal of the first start relay 60.

Unlike the main travel switch 30, the auxiliary travel switch 80 is not connected to the controller 20, but is connected to the start controller 110 through the auxiliary start relay 100. In addition, the auxiliary driving switch 80 is connected to the driving solenoid 50 through the auxiliary driving selecting switch 90, and outputs a signal for determining the driving direction by the driver's operation. The auxiliary driving selecting switch 90 is a controller. 20 is connected to the auxiliary driving switch 80 and the driving solenoid 50, and selects whether to receive a signal for determining the driving direction from the main driving switch 30 or the auxiliary driving switch 80. It is a switch for. That is, one of the signal output from the auxiliary travel switch 80 and the signal output from the controller 20 by the operation of the main travel switch 30 is selected and connected to the travel means. When the auxiliary driving selection switch 90 is turned on, the auxiliary driving system is activated and the main driving system is deactivated. When the auxiliary driving selecting switch 90 is turned off, the main driving system is activated and the auxiliary driving system is deactivated.

The auxiliary start relay 100 is connected to the auxiliary travel switch 80 and the start controller 110 to change a signal input to the start controller 110 in response to whether the auxiliary travel switch 80 is operated. Do it. In addition, the auxiliary start relay 100 receives a key start signal.

The start controller 110 is connected to the auxiliary travel switch 80 through the auxiliary start relay 100 and receives a key start signal through the auxiliary start relay 100.

The start controller 110 controls the driving of the start motor 40 by controlling the first start relay 60.

The start controller 110 controls the first start relay 60 with reference to the key on signal, the key start signal, and the signals of the second start relay 70 and the auxiliary start relay 100 to rotate the start motor 40. Do not do it. In other words, when it is confirmed that the auxiliary travel switch 80 is operated by the auxiliary start relay, the start controller 110 prohibits driving of the start motor even if the key start operation is performed.

When the auxiliary driving system is activated according to the selective connection of the auxiliary drive selection switch 90 and the starting state of the construction machine is in the key-on state, an input signal is supplied from the auxiliary drive switch 80 to a signal for the driving direction. Even when input to the start relay 100, the start controller 110 is controlled to turn off the first start relay 60 to prevent the start motor 40 from operating.

When the auxiliary driving system is activated according to the selective connection of the auxiliary drive selection switch 90 and the start state of the construction machine is a key start state, a signal for the driving direction is input from the auxiliary drive switch 80 and receives an input signal. The driving solenoid 50 operates accordingly.

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

10: ECU
20: controller
30: main drive switch
40: starting motor
50: driving solenoid
60: first start relay
70: second start relay
80: auxiliary drive switch
90: auxiliary drive selection switch
100: auxiliary starting relay
110: start controller

Claims (4)

A main travel switch for outputting a signal for determining a travel direction by a driver's operation;
An auxiliary traveling switch provided separately from the main driving switch and outputting a signal for determining a driving direction by an operation of the driver;
A controller for outputting a signal for determining the travel direction in response to an operation of the main travel switch;
Traveling means connected to the main travel switch and the controller and directly connected to the auxiliary travel switch;
A starter motor driven by driving power through a first start relay when a driver starts a key start;
A start controller outputs a signal output by the operation of the auxiliary travel switch to one side, and applies a signal to a switching terminal of the first start relay in response to a key start operation of a driver to apply the driving power to the start motor. ;
Including;
And the start controller prohibits driving of the start motor by controlling the first start relay when the key start operation is performed while the auxiliary travel switch is operated to the travel position. The method of claim 1,
An auxiliary start relay provided between the auxiliary travel switch and the start controller to change a signal input to the start controller in response to whether the auxiliary travel switch is operated.
And the start controller prohibits driving of the start motor even if the key start operation is made when it is confirmed that the auxiliary travel switch is operated by the auxiliary start relay. 3. The method according to claim 1 or 2,
A second start relay which is switched by a signal input from the controller and regulates a signal applied to a switching terminal of the first start relay;
When the main driving switch is operated in the key-on state, the second start relay changes the signal input to the switching terminal of the first start relay to block driving power applied to the start motor even if the key start operation is performed. And
When the key start operation is performed while the main travel switch is operated, the first start relay is blocked from applying the driving power to the start motor by driving the second start relay, and the auxiliary travel switch Is applied to the start motor by the start controller when the key start operation is operated in the operating state, the start safety device of a construction machine. 3. The method according to claim 1 or 2,
And an auxiliary travel selection switch for connecting one of the signal output from the auxiliary travel switch and the signal output from the controller by the operation of the main travel switch to the travel means. Device.

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