JP2010215003A - Power source system control device for working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power source system control device for a working vehicle capable of suppressing excessive discharge of a battery. <P>SOLUTION: The power source system control device 10 is provided with a battery relay 22 provided on an electric equipment line 20 between the battery 12 and an electric equipment 30; an ignition switch 24 capable of selecting any one of modes of an off mode, an on mode and a start mode of an engine 16; and a controller 26 for controlling the electric equipment line 20 so as to close it by the battery relay 22 by detecting selection of the on mode. When starting of the engine 16 is not detected within a predetermined time from the time when it is detected that it is switched from the off mode to the on mode, the controller 26 is constituted so as to open the electric equipment line 20 by the battery relay 22 even if it is detected that the on mode is selected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power supply system control device for a work machine such as a construction machine.

  Conventionally, work machines such as hydraulic excavators, cranes (wreckers), wheel loaders, etc. have either a battery relay provided on the electrical component line between the battery and electrical components, and one of the off mode, on mode, and engine start mode. The power supply system control apparatus which has an ignition switch which can select these modes, and a controller for controlling a battery relay etc. is provided (for example, refer patent document 1, 2). The controller controls the battery relay to close the electrical component line by detecting that the on mode or the start mode is selected in the ignition switch.

  The electrical component line is connected to various electrical components such as a starter motor for starting the engine and a light. By detecting that the start mode is selected, the controller closes the electrical component line and can supply the electric power charged in the battery to the starter motor, and the engine starts when the starter motor rotates. ing. Note that when the operator releases the ignition switch, the ignition switch automatically switches from the start mode to the on mode.

  In addition, a generator that is driven by the engine and can generate electricity is connected to the electrical component line. After the engine is started, electricity generated by the generator is supplied to electrical components such as lights. ing. The electricity generated by the generator is also used for charging the battery. This prevents the battery from being excessively discharged.

JP 2002-115634 A JP 2008-69644 A

  However, for example, after the operator switches the ignition switch from the off mode to the on mode, the on mode continues while the engine is stopped by leaving the work machine without switching from the on mode to the start mode for some reason. There are things to do. In such a case, since the generator is not operating, the electric power charged in the battery is continuously supplied to the electrical component such as the light. As a result, the battery may be excessively discharged and the so-called battery may be raised.

  This invention is made in view of this problem, Comprising: It aims at providing the power supply system control apparatus of the working machine which can suppress the excessive discharge of a battery.

  The present invention provides a battery relay provided in an electrical component line between a battery and electrical components, an ignition switch that can select any one of an off mode, an on mode, and an engine start mode, and an on mode And a controller that controls the battery relay to close the electrical component line by detecting that the switch has been selected, and the controller is configured to detect the engine being switched from the off mode to the on mode at a predetermined time. When the start of the engine is not detected, the above problem is solved by the power supply system control device for the work machine configured to open the electrical component line by the battery relay even if it is detected that the on mode is selected. .

  In this power supply system control device for a work machine, when the controller does not detect engine start at a predetermined time from the detection of switching from the off mode to the on mode, it detects that the on mode is selected. Even if the on-mode is continuously selected with the engine stopped, the power charged in the battery is written, etc. Is not continuously supplied to other electrical components. Therefore, excessive discharge of the battery can be suppressed.

  It should be noted that a generator that can generate electric power when driven by the engine is further included, and the controller may detect the start of the engine by detecting the start of the generator.

  Thus, by controlling the battery relay based on the detection of the start of the generator that plays the role of supplying power to the electrical components and charging the battery, excessive discharge of the battery can be reliably suppressed.

  In addition, the controller detects the stop of the generator after detecting the start of the generator in a state where it is detected that the ON mode is selected, and further detects the stop of the generator for a predetermined time. If the start of the generator is not detected again, the electrical component line may be opened by the battery relay even if it is detected that the on mode is selected.

  By doing in this way, even when the engine and generator which should be operating originally stop for some reason, excessive discharge of the battery can be suppressed.

  Even if the controller detects that the ON mode is selected, after opening the electrical component line by the battery relay, the controller enters a locked state so that the electrical component line is not closed, and the OFF mode is selected in the ignition switch. The lock state may be reset by detecting this.

  Thus, even if the controller detects that the ON mode is selected, after the electrical component line is opened by the battery relay, it is locked so as not to close the electrical component line, so that the battery is not discharged excessively. It can suppress more reliably. Further, since the lock state is reset by detecting that the off mode is selected in the ignition switch, the lock state can be easily reset.

  In addition, even if the controller detects that the ON mode is selected, after opening the electrical component line by the battery relay, the controller is locked so that the electrical component line is not closed, and the start mode is selected by the ignition switch. The lock state may be reset by detecting this.

  Also in this case, excessive discharge of the battery can be more reliably suppressed, and the locked state can be easily reset.

  According to the present invention, excessive discharge of the battery can be suppressed.

The block diagram which shows typically the outline | summary of a structure of the power supply system control apparatus of the working machine which concerns on embodiment of this invention. Flow chart showing operation of the power supply system control device Time series diagram showing an example of the relationship between the signal input to the input terminal of the controller and the signal output from the output terminal of the controller

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram schematically showing an outline of a configuration of a power supply system control device for a work machine according to the present embodiment.

  The power supply system control device 10 of the work machine has a battery relay 22 provided in the electrical component line 20 between the battery 12 and the electrical component 30, and any one of an off mode, an on mode, and a start mode of the engine 16. An ignition switch 24 that can be selected and a controller 26 that controls the battery relay 22 to close (connect) the electrical component line 20 by detecting that the ON mode has been selected.

  The power supply system control device 10 detects that the on mode is selected when the controller 26 does not detect the start of the engine 16 at a predetermined time from when the controller 26 detects that the mode has been switched from the off mode to the on mode. Even in such a case, the electric component line 20 is opened (cut) by the battery relay 22. Other configurations are not particularly important for understanding the present embodiment, and thus the description thereof is omitted as appropriate.

  The battery 12 is, for example, a lead storage battery. In the present embodiment, the battery 12 having an output voltage of 12V is connected in series to output a voltage of 24V. The battery 12 installed on the side close to the battery relay 22 as an electric circuit is connected to the battery relay 22 at the positive electrode, and the negative electrode of the other battery 12 is connected to the body (not shown) of the work machine. Etc. constitute the ground.

  In addition to the battery 12 and the electrical component 30, the electrical component line 20 includes an ignition switch 24, a controller 26, a starter motor 28 for starting the engine 16, and a generator 18 that can generate power when driven by the engine 16. Etc. are connected. In the present embodiment, for the sake of convenience, one electrical component 30 is illustrated in FIG. 1, but actually, for example, a plurality of electrical components such as headlights and room lights are connected to the electrical component line 20. The electrical component 30 represents these.

  The engine 16 is a diesel engine, for example. The engine 16 may be another reciprocating engine such as a gasoline engine, a gas turbine engine, or the like. The generator 18 is, for example, an AC generator or a DC generator, and is configured to be mechanically driven by the engine 16 to generate power and supply the generated power to the electrical component line 20. The current supplied from the generator 18 to the electrical component line 20 is a direct current, and the positive electrode side of the generator 18 is connected to the electrical component line 20 and the negative electrode side is connected to the ground (not shown). When the generator 18 is an AC generator, the generated AC current is converted into a DC current by a rectifier and supplied to the electrical component line 20. The starter motor 28 is a DC motor and is configured to rotate by a DC current supplied from the battery 12. The starter motor 28 may be configured to be supplied with a direct current from the battery 12 via a starter relay (not shown).

  The battery relay 22 includes an input side contact 22A connected to the battery 12 side, an output side contact 22B connected to the electrical component 30 side, and an electromagnetic coil 22C for opening and closing the input side contact 22A and the output side contact 22B. The input side contact 22A and the output side contact 22B are selectively opened and closed depending on whether or not current is supplied from the controller 26 to the electromagnetic coil.

  The ignition switch 24 is a key switch, for example, and can be selectively switched to any one of an off mode, an on mode, and a start mode of the engine 16. Specifically, the ignition switch 24 includes an input terminal 24A connected to the electrical component line 20 and two output terminals 24B and 24C, and only one output terminal 24B is electrically connected to the input terminal 24A in the on mode. In the start mode, the output terminals 24B and 24C are both electrically connected to the input terminal 24A.

  The controller 26 is a kind of computer such as a microcomputer. The controller 26 has three input terminals IN1, IN2, and IN3 and two output terminals OUT1 and OUT2. Further, the controller 26 has an input terminal POWER connected to the electrical component line 20.

  The input terminal IN1 is connected to the output terminal 24B of the ignition switch 24. The input terminal IN2 is connected to the output terminal 24C of the ignition switch 24. The input terminal IN3 is connected to the generator 18.

  The output terminal OUT1 is connected to the starter motor 28. When a direct current is supplied from the battery 12 to the starter motor 28 via the starter relay, the output terminal OUT1 is connected to an electromagnetic coil (not shown) of the starter relay. The output terminal OUT2 is connected to the electromagnetic coil 22C of the battery relay 22. The electromagnetic coil is also connected to the ground.

  The controller 26 detects the selection of the on mode or the start mode in the ignition switch 24 via the input terminals IN1 and IN2, and closes the electrical component line 20 by the battery relay 22 via the output terminal OUT2. It is configured.

  Further, the controller 26 is configured to issue a signal for instructing the starter motor 28 to rotate via the output terminal OUT1 by detecting that the start mode is selected in the ignition switch 24 via the input terminal IN2. Has been.

  The controller 26 is configured to detect the start of the engine 16 by detecting the start of the generator 18 via the input terminal IN3.

  Next, the operation of the power system controller 10 for the work machine will be described with reference to the flowchart of FIG. In the initial state, the ignition switch 24 is in the off mode, and the controller 26 is in the sleep state.

  When the operator operates the ignition switch 24 to switch from the off mode to the on mode, the controller 26 detects that the ignition switch 24 has been switched from the off mode to the on mode via the input terminal IN1 (S102). The electrical component line 20 is closed by the relay 22 (S104). As a result, the power charged in the battery can be supplied to the starter motor 28 and the electrical component 30.

  Here, for example, when the operator leaves the work machine without switching the ignition switch 24 from the on mode to the start mode for some reason, the on mode may continue with the engine 16 stopped. In such a case, since the generator 18 is not operating, the electric power charged in the battery 12 is supplied to the electrical component 30.

  On the other hand, when the controller 26 detects that the mode has been switched from the off mode to the on mode (S102), the controller 26 starts counting the time from when the mode is switched from the off mode to the on mode (S106). Further, the controller 26 determines whether or not the start of the engine 16 has been detected (S108) and determines whether or not a predetermined time has elapsed since the time when the engine was switched from the off mode to the on mode (S110). The step (S108) for determining whether or not the start of the engine 16 has been detected and the step (S110) for determining whether or not a predetermined time has elapsed since the time when the off mode was switched to the on mode. They may be executed in the reverse order or may be executed simultaneously.

  If it is determined that the start of the engine 16 is not detected (S108), and it is determined that a predetermined time has not elapsed since the time when the engine was switched from the off mode to the on mode (S110), the engine 16 is started. The step (S108) for determining whether or not an on-mode has been detected and the step (S110) for determining whether or not a predetermined time has elapsed since the on mode was selected are repeated.

  On the other hand, when it is determined that the start of the engine 16 is not detected (S108), and it is determined that a predetermined time has elapsed from the time when the off mode is switched to the on mode (S110), the controller 26 Even if it is detected that the on mode is selected, the electrical component line 20 is opened by the battery relay 22 (S112). Therefore, even when the on mode is selected in the ignition switch 24, the electric power charged in the battery 12 is not continuously supplied to the electrical component 30, and excessive discharge of the battery 12 is suppressed.

  The controller 26 enters the sleep state after the electrical component line 20 is opened by the battery relay 22 (S112). Even if the operator operates the ignition switch from this state to switch from the on mode to the start mode, the controller 26 The battery relay 22 is locked so as not to close the electrical component line 20 (S114). The locked state of the controller 26 is reset when the controller 26 detects that the off mode is selected by the operator operating the ignition switch (S116) (S118). After the reset, the operator operates the ignition switch 24 to switch from the off mode to the on mode in the same manner as described above, whereby the electrical component line 20 can be closed by the battery relay 22.

  On the other hand, if the operator operates the ignition switch 24 to switch from the on mode to the start mode before the predetermined time has elapsed from the time when the mode is switched from the off mode to the on mode, the controller 26 switches the ignition via the input terminal IN2. The switch 24 detects that the start mode has been selected, and rotates the starter motor 28 via the output terminal OUT1. Thereby, the engine 16 is started, and the generator 18 is mechanically driven by the engine 16 to start power generation. When the engine 16 is started and the operator releases the ignition switch 24, the ignition switch 24 automatically switches from the start mode to the on mode. The controller 26 detects the start of the engine 16 by detecting the start of the generator 18 via the input terminal IN3 (S108). After the engine 16 is started in this way, the electric power generated by the generator 18 is supplied to the electrical component 30. The electricity generated by the generator 18 is also used for charging the battery 12. Accordingly, in this case as well, excessive discharge of the battery 12 is suppressed.

  Further, after the engine 16 is started, when the operator operates the ignition switch 24 to switch from the on mode to the off mode due to the end of the target work or the like, the controller 26 turns on the ignition switch 24 via the input terminal IN1. Is switched to the off mode (S120), and the electrical equipment line 20 is opened by the battery relay 22 (S122). As a result, the engine 16 is stopped and the supply of power from the battery 12 to the starter motor 28 and the electrical component 30 is cut off, and excessive discharge of the battery 12 is suppressed.

  It should be noted that although the off mode is not selected in the ignition switch 24 and the engine 16 and the generator 18 are supposed to be operating originally, for example, the lack of fuel, the malfunction of the engine 16 and the generator 18, etc. The engine 16 and the generator 18 may stop for some reason. The controller 26 determines whether or not the generator 18 has stopped despite the fact that the off mode is not selected in the ignition switch 24 (S124). When the controller 26 detects that the generator 18 has stopped, the controller 26 starts counting time from the point in time when the stop of the generator 18 is detected (S126). Further, the controller 26 determines whether or not the generator 18 has been started again (S128), and determines whether or not a predetermined time has elapsed since the stop of the generator 18 was detected (S130). . It should be noted that the step (S128) for determining whether or not these generators 18 have been started again and the step (S130) for determining whether or not a predetermined time has elapsed from the point in time when the stop of the generator 18 is detected. , May be executed in the reverse order, or may be executed simultaneously.

  If it is determined that the generator 18 has not been started again (S128), and it has been determined that the predetermined time has not elapsed since the detection of the stop of the generator 18 (S130), the generator 18 is turned on again. The step (S128) for determining whether or not the engine has been started and the step (S130) for determining whether or not a predetermined time has elapsed since the detection of the stop of the generator 18 are repeated.

  On the other hand, if it is determined that the generator 18 has not been started again (S128), and it is determined that a predetermined time has elapsed since the time when the generator 18 was detected to be stopped (S130), the controller 26 is turned on. Even if it is detected that the mode is selected, the electrical component line 20 is opened by the battery relay 22 (S112). Therefore, even when the engine 16 or the generator 18 that should be operating normally stops for some reason, excessive discharge of the battery 12 can be suppressed.

  FIG. 3 is a time-series diagram illustrating an example of a relationship between signals input to the input terminals IN1, IN2, and IN3 of the controller 26 and signals output from the output terminals OUT1 and OUT2. In FIG. 3, from the time when the controller 26 is switched from the off mode to the on mode, which is a condition for the controller 26 to open the electrical component line 20 by the battery relay 22 even if it is detected that the on mode is selected. The predetermined time is shown. Reference numeral t <b> 2 indicates a time lag from when the ignition switch 24 is switched from the on mode to the off mode until the battery relay 22 actually opens the electrical component line 20. Further, the symbol t3 indicates that the controller 26 detects the stop of the generator 18, which is another condition for opening the electrical component line 20 by the battery relay 22, even if it is detected that the on mode is selected. The predetermined time is shown. Note that t1 and t3 may be set to the same time or different times.

  As described above, when the engine 16 is started before the predetermined time has elapsed from the time when the mode is switched from the off mode to the on mode, the electric power generated by the generator 18 is supplied to the electrical component 30, and Since the electric power generated by the generator 18 is also used for charging the battery, excessive discharge of the battery 12 is suppressed. If the engine 16 does not start until the predetermined time has elapsed from the time when the mode is switched from the off mode to the on mode, the controller 26 opens the electrical component line 20 by the battery relay 22 (S112). The charged electric power is not continuously supplied to the electrical component 30, and excessive discharge of the battery 12 is suppressed. That is, in any case, excessive discharge of the battery 12 is suppressed.

  Further, even if the engine 16 and the generator 18 are stopped for some reason after the engine 16 is started, the restart of the generator 18 is not detected at a predetermined time from when the stop of the generator 18 is detected. In this case, since the controller 26 opens the electrical component line 20 by the battery relay 22 even when it is detected that the on mode is selected (S112), the power charged in the battery 12 is also supplied to the electrical component 30 in this case. Therefore, excessive discharge of the battery 12 is suppressed.

  Further, the controller 26 controls the battery relay 22 based on the detection of the start of the generator 18 that plays the role of supplying power to the electrical component 30 and charging the battery 12, so that excessive discharge of the battery 12 is ensured. Can be suppressed.

  Moreover, even if the controller 26 detects that the ON mode is selected, after opening the electrical component line 20 by the battery relay 22 (S112), the controller 26 is locked so as not to close the electrical component line 20 ( S114), the excessive discharge of the battery 12 can be more reliably suppressed. The locked state is reset when the controller 26 detects that the off mode is selected in the ignition switch 24 (S116) (S118), so that the locked state can be easily reset.

  Note that the lock state may be reset when the controller 26 detects that the start mode is selected in the ignition switch 24. Also in this case, excessive discharge of the battery 12 can be more reliably suppressed, and the controller 26 can be easily reset.

  In addition, even if the controller 26 detects that the ON mode is selected, the controller 26 is in a locked state so as not to close the electrical component line 20 even after the electrical component line 20 is opened by the battery relay 22 (S112). Instead, the controller 26 may close the electrical component line 20 by the battery relay 22 when the operator operates the ignition switch from this state to switch from the on mode to the start mode.

  Further, in the above embodiment, the controller 26 detects the start of the engine based on the detection of the start of the generator 18, but the controller 26 detects that the start mode is selected in the ignition switch 24. It is good also as composition which detects starting of an engine. Thus, the apparatus can be simplified by making the detection of the start mode also the detection of the start of the engine.

  In the above embodiment, the controller 26 has three input terminals IN1, IN2, and IN3 and two output terminals OUT1 and OUT2. However, the controller has input terminals and / or outputs for other uses. It is good also as a structure provided with a terminal. Alternatively, the input terminals IN1, IN2, and IN3 and the output terminals OUT1 and OUT2 may not be partly included.

  For example, in the above embodiment, as a function of the controller 26, when the start of the engine 16 is not detected at a predetermined time from the time when it is detected that the switch from the off mode to the on mode is detected, the on mode is selected. Although the function of opening the electrical component line 20 by the battery relay 22 is shown even if it is detected, the controller further has other functions, and includes an input terminal and / or an output terminal corresponding to such a function. But you can.

  Further, for example, in the above-described embodiment, the controller 26 instructs the starter motor 28 to rotate via the output terminal OUT1 by detecting that the start mode is selected at the ignition switch 24 via the input terminal IN2. However, when the start mode is selected in the ignition switch 24, the signal output from the start mode of the ignition switch 24 is directly input to the starter motor 28 or the starter relay, and the starter motor 28 It is good also as a structure which rotates. Alternatively, the signal output from the start mode of the ignition switch 24 may be indirectly input to the starter motor 28 or the starter relay via a timer other than the controller 26 to rotate the starter motor 28.

  Moreover, in the said embodiment, although the battery relay 22 is the structure provided with the input side contact 22A, the output side contact 22B, and the electromagnetic coil 22C, a battery relay is good also as a structure which does not have contacts, such as a semiconductor relay, for example. .

  Moreover, in the said embodiment, although the controller 26 is a kind of computer, it may replace with a controller and may use the controller of the structure which combined a timer and a relay, for example.

  In the above embodiment, two batteries 12 having an output voltage of 12V are connected in series to output a voltage of 24V. However, the voltage and number of the batteries are not particularly limited. For example, only one battery 12 having an output voltage of 12V may be provided and a voltage of 12V may be output.

  The present invention can be used for work machines such as hydraulic excavators, cranes (wreckers), and wheel loaders.

DESCRIPTION OF SYMBOLS 10 ... Power supply system control device 12 ... Battery 16 ... Engine 18 ... Generator 20 ... Electrical equipment line 22 ... Battery relay 24 ... Ignition switch 26 ... Controller 28 ... Starter motor 30 ... Electrical equipment

Claims (5)

The battery relay provided in the electrical component line between the battery and the electrical component, the ignition switch that can select any one of the off mode, the on mode, and the engine start mode, and the on mode is selected. A controller that controls the battery relay to close the electrical component line by detecting
If the controller does not detect the start of the engine at a predetermined time from the detection of switching from the off mode to the on mode, the controller does not detect that the on mode is selected. A power supply system control device for a work machine, wherein the electric component line is opened by a battery relay. In claim 1,
A power system control for a work machine, further comprising a generator capable of generating electric power by being driven by the engine, wherein the controller detects the start of the engine by detecting the start of the generator. apparatus. In claim 2,
The controller detects the stop of the generator after detecting the start of the generator once in a state of detecting that the on mode is selected, and further detects the stop of the generator. When it is not detected that the generator is restarted at a predetermined time, the battery relay is configured to open the electrical component line even if it is detected that the on mode is selected. Power supply system control device for work machines. In any one of Claims 1 thru | or 3,
Even if the controller detects that the on-mode is selected, after opening the electrical component line by the battery relay, the controller enters a locked state so as not to close the electrical component line, and the ignition switch A power supply system control device for a work machine, wherein the lock state is reset by detecting that an off mode is selected. In any one of Claims 1 thru | or 3,
Even if the controller detects that the on-mode is selected, after opening the electrical component line by the battery relay, the controller enters a locked state so as not to close the electrical component line, and the ignition switch A power supply system control device for a work machine, wherein the lock state is reset by detecting that a start mode is selected.

Images