JPH0663926B2 - Battery car self-diagnosis device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a self-diagnosis device for a battery vehicle.

(Prior Art) Generally, in an electric vehicle such as a battery forklift,
When an abnormality occurs in the electrical system, an external analyzer is used to detect the abnormality. That is, connect the connector of this analyzer and the connector of each part on the electric car side,
The abnormal point is detected by measuring the voltage on the electric vehicle side and detecting the difference between the measured value and the set voltage.

(Problems to be solved by the invention) However, in the above-mentioned abnormality detection method, it is not possible to immediately confirm the location of the abnormality in the electric vehicle, and it is necessary to stop the analysis of the abnormality by the analyzer and repair the abnormality. Analysis and repair work are complicated and time-consuming.

Furthermore, since the analysis work is performed by connecting the connector between the analyzer and the electric car, it is impossible to detect an abnormality of the electric car part which is not output to the outside by the connector.

Therefore, the object of the present invention is to perform self-diagnosis inside the electric vehicle by the function of the electric vehicle itself, and it is possible to easily recognize the abnormal portion in the work vehicle without requiring time to detect the abnormality, and the work can be performed easily. It is to provide a simple control device.

Configuration of the Invention (Means for Solving Problems) In order to solve the above-mentioned problems, the present invention preliminarily determines whether or not the input means, the instruction means, and the driving means for traveling and cargo handling normally operate. A self-diagnosis means for diagnosing in a predetermined order, and when the self-diagnosis means judges an abnormal part, a plurality of light emitting parts of the battery capacity meter in the capacity display state are appropriately selected and displayed corresponding to the abnormal part. The gist of the invention is that it comprises a display control means for instructing.

(Operation) By adopting the above-described configuration, the present invention uses the signal from the display control means to display the capacity of the battery when the self-diagnosis means detects an abnormality in a part in the input means, the instruction means and the drive means. The plurality of light emitting units of the battery indicator for performing the above perform display corresponding to the abnormal portion.

(Embodiment) An embodiment of the present invention embodied in a control device for a battery-powered forklift will be described in detail below with reference to the drawings.

A forklift vehicle 1 shown in FIG. 3 travels forward and backward by forward and reverse rotations of drive wheels 2 provided at a rear portion thereof, and further includes a mast 4 provided at a front portion and a fork 3 supported thereby. 5, the cargo handling operation is performed. The cargo handling mechanism 5 is driven by the expansion and contraction operations of the lift cylinder L, the tilt cylinder, and the reach cylinder (none of which is shown), and the reach cylinder moves the mast 4 along the guide portion 6 extending toward the front of the vehicle 1. Move back and forth. The lift cylinder L raises and lowers the fork 3 along the mast 4, and the tilt cylinder tilts the fork 3.

FIG. 2 (a) shows a drive system electric circuit of a forklift. Of these, a cargo handling main circuit P as driving means for cargo handling will be described. The cargo handling motor 7 includes a battery 8 via a cargo handling contactor 8a. Connected to the positive terminal. The cargo handling motor 7 is a series-wound motor including an armature 9 and a field winding 10. The field winding 10 has a minus terminal of the battery 8 via a cargo handling transistor 11 and a current sensor 12 for controlling a chopper. It is connected to the. Then, the cargo handling contact 8a is held in the illustrated ON state, and the cargo handling transistor 11 is controlled to be turned on / off to control the rotation speed of the cargo handling motor 7.

Next, the traveling main circuit M as the driving means for traveling will be described. The traveling motor 13 is connected to the plus terminal of the battery 8 via a current sensor 14 and a regenerative contactor 15. The traveling motor 13 includes an armature 16 and a field winding.
A series-wound motor consisting of 17 is used, and a forward contactor 18 and a reverse contactor 18 are provided at both ends of the field winding 17, respectively.
When 19 is connected, a bypass contactor 20 and a main transistor 22 are connected in parallel between these contactors 18, 19 and the battery 8. Then, as shown in the figure, turn on the regenerative contactor 15 and turn on both contactors.
18, 19 are held at the forward position, and the traveling motor 13 is rotated in the forward direction to advance the vehicle 1. At this time, the traveling motor 13 has the main transistor 22
The rotation speed is increased / decreased by the chopper control, and the traveling speed of the vehicle 1 is adjusted accordingly.

A regeneration transistor 23 and a regeneration resistor are provided between the armature 16 of the traveling motor 13 and the positive terminal of the battery 8.
23a is connected in series. Further, flywheel diodes 24 and 25 are connected between the forward and backward contactors 18 and 19 of the field winding 17 of the traveling motor 13 and the positive terminal of the battery 8, respectively, and a regenerative contactor. A regenerative flywheel diode 26 is also connected between 15 and the negative terminal of the battery 8.

In the above electric circuit, as shown in FIG. 2 (b), a regenerative circuit E is configured (only necessary members are shown), the regenerative contactor 15 is turned off, and the forward and reverse contactors 18, 19 is held in the reverse position, the base current is supplied to the main transistor 22 and the regeneration transistor 23, the current is supplied to the traveling motor 13 via the regeneration flywheel diode 26, and the armature 16 is generated. Increase power. When the electromotive force exceeds a certain value, the regeneration transistor 23 is connected to the main transistor.
22 is turned off, a regenerative current is made to flow from the armature 16 to the plus terminal of the battery 8 via both flywheel diodes 24 and 25, and the traveling motor 13 is regeneratively braked.

Subsequently, a control configuration of the traveling main circuit M and the cargo handling main circuit P described above will be described with reference to FIG.

A central processing unit (hereinafter referred to as CPU) 27 as a self-diagnosis means and a display control means has a read-only memory (ROM) 28 as a storage means and a readable / writable memory (R).
AM) 29 is connected. The ROM 28 stores a control program for the CPU 27, standard data for diagnosing whether or not each electric system part is functioning normally, a traveling program, and a cargo handling program. Further, the RAM 29 temporarily stores digital data corresponding to analog data input from various input members. The CPU 27 and the ROM 28 constitute an instruction means for instructing the traveling main circuit M and the cargo handling main circuit P to perform a predetermined operation based on a signal from the input side when the forklift is traveling and loading.

The connection configuration of the input side of the CPU 27 will be described. A traveling accelerator as an input means that is turned on / off by the stepping operation of the traveling accelerator and the cargo handling accelerator, and increases and decreases the rotational speeds of the traveling motor 13 and the cargo handling motor 7. The sensor 30 and the cargo handling accelerator sensor 31 are A / D converters 32 and 33, respectively.
Connected through. Further, the current sensors 12 and 14 of both main circuits M and P are connected via the A / D converter 34, respectively, and their analog output values are digitally converted to CP.
It is designed to be input to U27. Further, a traveling main circuit M is connected to the CPU 27 through a plugging sensor Ms, and a forward and reverse limit switch 35 is selectively switched by operating a direction lever.
a and 35b are connected respectively. In addition, the CPU 27 has a lift limit switch 36 that is turned on / off by operating the lift lever, reach lever, and tilt lever.
The a, reach limit switch 36c, and tilt limit switch 36b are connected. These switch groups 36a, 36
By turning b and 36c on and off, the cargo handling motor 7
The cargo handling pump controlled by is rotated.

A battery voltage detector 37 that detects the voltage of the battery 8 is connected to the CPU 27.
Based on the battery voltage output from the CPU 27, the CPU 27 calculates the remaining capacity of the battery 8 and outputs the remaining capacity data one by one.
Write to RAM29. Furthermore, the CPU27 has a brake switch.
61, the park brake switch 62, the key switch 38, and the dip switch 39 are connected, and the drive control of both main circuits M and P is started by the ON operation of the key switch 38, and the abnormality of the electric system when the vehicle 1 is traveling. The self-diagnosis mode for checking the presence or absence of is started. When the dip switch 39 is pressed while the vehicle 1 is stopped, the CPU2
7 is the abnormality analysis mode that analyzes the abnormality of the electrical system,
Processing operation for abnormality analysis is performed.

The forward limit switch 35a, the reverse limit switch 35b, the brake switch 61, and the park brake switch 62 are operation means for traveling, and the lift switch.
The 36a, the tilt switch 36b, and the reach switch 36c constitute an operating means for cargo handling.

Further, contactor drive circuits 40 to 44 are connected to the output side of the CPU 27, respectively, and a regenerative contactor 15, a forward contactor 18, a reverse contactor 19, a bypass contactor 20,
Opening and closing of the cargo contactors 8a are controlled. further,
The cargo handling transistor 11, the traveling transistor 22, and the regeneration transistor 23 are connected to the CPU 27 through three transistor drive circuits 45 to 47, respectively.
Controls 11,22,23 on / off. These members connected to the output side are driven and controlled according to the program stored in the ROM 28 in accordance with the operation of the members on the input side,
Further, the presence / absence of abnormality of the members on the input side and the output side is detected.

That is, for example, the cargo handling contactor 8a is turned on / off by relay control of the contactor drive circuit 40 associated with the on / off operation of the key switch 38, and when in the on state, the current sensor 12 detects the current flow and The transistor 11 is on / off controlled by operating the cargo handling accelerator switch 31, and a change in current flowing at this time is also detected by the current sensor 12. The regenerative contactor 15 is turned on / off by the control of the contactor drive circuit 41 associated with the operation of the key switch 38, and when it is in the on state, it is a forward or reverse limit switch.
35a and 35b are turned on, and the current sensor 14 detects a current according to the operation amount of the traveling accelerator.

The forward contactor 18 and the reverse contactor 19 are switched from the forward position to the reverse position by the switching operation of the forward and reverse limit switches 35a and 35b, respectively, and the reverse voltage generated at this time is detected by the plugging sensor Ms. .

The travel transistor 22 is driven by the operation of the travel accelerator 30 via the transistor drive circuit 46, and the change in the current flowing through the travel motor 13 when it is turned on is detected by the current sensor 14. . Further, the bypass contactor 20 is driven by the contactor drive circuit in accordance with the operation of the traveling accelerator 30, and the current flowing when it is in the ON state is detected by the current sensor 14.

Further, a battery capacity meter 49 is connected to the output side of the CPU 27 via a display drive circuit 48. As shown in FIG. 4, this battery capacity meter 49 has one check lamp 50.
And the six first to sixth indicator lamps 51 arranged side by side
To 56 and one battery lamp 57 provided at the bottom. These lamps 50, 51 to 56, 57 are formed of light emitting diodes and emit light in yellow, green and red, respectively, and all the lamps 50, 51 to 5 are turned on when the key switch 38 is turned on.
By turning on 6,57 for 2 seconds, it is confirmed that the lamp is not burned out. This battery capacity meter
Reference numeral 49 indicates the decrease in the remaining capacity of the battery 8 detected by the battery voltage detector 37 in the normal state from the F side (non-discharge side) of the first to sixth indicator lamps 51 to 56 to the E side (total discharge side). And turn off the lights one by one to display digitally. Then, when the remaining capacity of the battery 8 exceeds a preset allowable remaining value, the battery lamp 57 is turned on and a warning is displayed.

Further, by the input operation of the key switch 38, the CPU 27 sets the self-diagnosis mode at predetermined time intervals and searches for an abnormality in each part according to a predetermined program. The display operation of is performed. And when CPU27 confirms the abnormality in the electric system,
The CPU 27 turns on the check lamp 50, suspends the battery capacity display function of the battery capacity meter 49 at the same time as this lighting, and selects one or more of the indicator lamps 51 to 56 according to the result of the self-diagnosis operation. , The abnormal part is lit and displayed in a predetermined display mode corresponding to each part.
Further, when the DIP switch 39 is operated while the vehicle 1 is stopped, the CPU 27 shifts to the abnormality analysis mode with the check lamp 50 blinking, and all the lamps 50, 51 to 56, 57 are used for abnormality analysis. Display.

Further, a charge panel 58 is connected to the CPU 27 so that it can be input and output, and is connected to an external device such as a battery charger when the battery 8 is charged.

Now, the overdischarge prevention function of the control device configured as described above will be described below.

When the battery 8 is over-discharged, the CPU 27 prohibits simultaneous energization of both contactor drive circuits 40 and 44, energizes only one of the contactor drive circuits 40, switches the regenerative contactor 15 to the ON position, and drives the main drive. The circuit M is preferentially energized.
Therefore, the traveling motor 13 is rotationally driven to move the vehicle 1 to the vicinity of the external charging device, and the external device charges the battery 8 via the charge panel 58.

Therefore, when the battery 8 is overdischarged, the vehicle 1
The minimum current required to move the main circuit M for traveling
However, there is no fear of premature consumption due to excessive burden.

Note that if only cargo handling operations are performed after overdischarging, the CPU27
Via the contactor drive circuit 44, the cargo handling contactor 8a
Turn on. Therefore, the cargo handling operation can be continued to the required minimum without being left in the middle of the work.

Next, the self-diagnosis function of the present control device will be described.

As described above, when the key switch 38 is turned on, the CP
It is determined whether or not there are three or more of U27 itself, ROM28, and RAM29, and then the CPU27 is set to the self-diagnosis mode at every predetermined time. Then, the traveling transistor 22, the cargo handling transistor 11, the current sensors 12 and 14, the forward contactor 18, the reverse contactor 19, the bypass contactor 20,
The traveling accelerator sensor 30, the cargo handling accelerator sensor 31, and the battery 8 are checked for any abnormalities in the voltage of 14 parts at predetermined intervals, and the indicator lamps 51 to 56 of the capacity meter 49 are displayed in an appropriate lighting mode. . It should be noted that the indicator lamps 51 to 56 that are turned off are shown by hatching in the drawings.

That is, after the key switch 38 is input, as shown in FIG. 5, step S1 (hereinafter, the step is simply represented by S)
At, the program for traveling and cargo handling stored in the ROM 28 is read out, and the traveling operation and the cargo handling operation are executed in accordance with this program. While this program is running, CPU27
Reads the voltage values of the predetermined 14 parts in S2, and S3
Then, the read voltage value is compared with the data value for diagnosis stored in the ROM 28 in a predetermined order, and it is determined whether or not both values are within a predetermined error range. Then, if the determination result is NO, after performing error processing according to a predetermined program corresponding to the abnormal portion in S4, S5
At the same time, the check lamp 50 of the capacity meter 49 is turned on to notify the abnormality of the electric system and the indicator lamp
After selecting 51 to 56 as appropriate and illuminating in a display mode corresponding to the abnormal part and displaying the failed part for a predetermined time, S1
Return to. Note that the determination result in S3 is YES.
In case of, the process returns to S1 and the above operation is repeated.

When an abnormality is found in the CPU27 self-diagnosis in the self-diagnosis result of S3 described above, the vehicle 1 is treated as error processing in S4.
After stopping the traveling function and cargo handling function of Fig. 6, Fig. 6 (a)
As shown by, all the indicator lamps 51 to 56 of the capacity meter 49 are turned on to display an error. When an abnormality in the RAM 29 is confirmed, a predetermined display is displayed on the capacity meter 49 and the traveling and cargo handling functions of the vehicle 1 are disabled. When an abnormality in the ROM 28 and the battery 8 is detected, the traveling and cargo handling functions are stopped, and the charging panel 58 is cut off during charging to render the battery unchargeable.

Further, when the CPU 27 confirms the abnormal voltages of the traveling main circuit M and the cargo handling main circuit P, respectively, the traveling operation or the cargo handling function of the vehicle 1 is stopped, and the capacity meter 49 is shown in FIGS. 6 (b) and 6 (c). Display an error. In addition, the CPU 27 uses the current sensor 14,
When 12 abnormalities are detected, the traveling function and the cargo handling function of the vehicle 1 are stopped according to the functions of the main circuits M and P in which the corresponding sensors 14 and 12 are installed.

When the voltage values of the forward contactor 18 and the reverse contactor 19 are detected to be abnormal, the CPU 27 makes the vehicle 1 inoperable and outputs a signal to the capacity meter 49 to output the sixth signal.
As shown in FIG. 3D, only the second indicator lamp 52 is turned on to display an error. Further, when the bypass contactor 20 shows an abnormal voltage value, the CPU 27 causes the duty ratio to be 80% even when the traveling accelerator is fully opened.
The output is controlled so that

Further, the CPU 27 sequentially reads the voltage values of the traveling accelerator sensor 30 and the cargo handling accelerator sensor 31, and these accelerator sensors 30 and 31 have a voltage value relative to the operation amount of the traveling accelerator and the cargo handling accelerator due to a disconnection, a short circuit, or the like. When they are different, the CPU 27 limits the duty ratio during traveling or during cargo handling to 50% according to the functions of the accelerator sensors 30 and 31.

As described above, the capacity meter 49 digitally displays the remaining capacity of the battery 8 as the key switch 38 is input. At the same time, the CPU 27 detects whether or not there is an abnormality in the region group in a predetermined cycle, performs error processing such as stopping the traveling operation only when there is an abnormality, and then the capacity meter 49 replaces the capacity display with the abnormal part. Is displayed only for a predetermined time.

After that, the CPU 27 follows the traveling / loading program,
Signals relating to the traveling operation and the cargo handling operation of the vehicle 1 are output to each part. Therefore, the self-diagnosis function is exerted and the failed portion is confirmed without disturbing the battery remaining capacity display function of the capacity meter 49.

When the faulty part is confirmed, the DIP switch 39
Based on the operation of, the self-diagnosis function of the CPU 27 is switched to the abnormality analysis function, that is, the analyzer function, and the detailed analysis of the faulty part of the electric system is started.

Prior to operating the DIP switch 39 described above, the vehicle 1
The mast 4 is moved to the frontmost along the guide portion 6 and holds the fork 3 at the lowest position. And
The vehicle 1 is jacked up until the drive wheels 2 are separated from the ground, and the vehicle 1 is prevented from starting during the test of the traveling system switch group.

After that, when the DIP switch 39 is operated, the preparation for the analyzer mode is completed, and the capacity system 49 is in a state in which all the indicator lamps 51 to 56 and the battery lamp 57 are turned off and the check lamp is turned on as shown in FIG. Only 50 starts blinking.

The analyzer mode is roughly divided into a preliminary test at the beginning and an analysis test at the main stage following the preliminary test. In the beginning, in addition to the RAM test, ROM test, main circuit test, current sensor test, accelerator test, and battery voltage test in line with the self-diagnosis mode items, a static test consisting of a DIP switch test and an analysis test of this stage. A switch input test is performed to check the functions of various switches used in.

After the static test is completed in analyzer mode,
That is, when the dip switch 39 is operated, the CPU 27 causes the RAM 29
The check is started sequentially from the beginning, and if there is no abnormality, the capacity meter
Display normal for 0.5 seconds on 49 and proceed to the check of the next item. When an abnormality is detected in an item with the CPU 27, the capacitance meter 49 displays the abnormality for 5 seconds, and then shifts to the check of the next item. When the CPU 27 detects an abnormality in the ROM 28, it does not move to the next item.

In the above static test, the presence / absence of abnormality in the same item is recognized mainly by using the same lamps 50, 51 to 56, 57 of the capacity meter 49 and lighting or blinking them. Further, when an abnormality is detected in the main circuit test or the like, the battery lamp 57 is turned off or blinks to identify whether the main circuit is a traveling system or a cargo handling system.

That is, when there is no abnormality in the RAM 29 test, the sixth indicator lamp 56 lights up as shown in FIG. 8 (a), and when an abnormality is found, as shown in FIG. 8 (b), Indicator light 56 flashes. In this test, the battery lamp 57 is kept in the off state regardless of whether there is any abnormality.

Further, in the main circuit test, when the cargo handling main circuit P or the traveling main circuit M is normal, both are shown in FIG. 9 (a).
As shown in, the fourth indicator lamp 54 is turned on and the other lamps are kept in the off state. On the other hand, when there is an abnormality in the traveling main circuit M, as shown in FIG. 9B, the fourth indicator lamp 54 blinks and the battery lamp 57 goes out, but the cargo handling main circuit P does not. When there is an abnormality, the fourth indicator lamp 54 blinks and the battery lamp 57 as shown in FIG. 9 (c).
Also flashes.

Similarly, during the accelerator test, the running accelerator sensor
When the 30 or cargo handling accelerator sensor 31 is normal, the first
The indicator lamp 51 lights up [Fig. 10 (a)], and if there is any abnormality, in addition to the blinking of the first indicator lamp 51, the battery lamp turns off or blinks [Fig. 10 (b)]. Or (c)].

Further, in the test of the DIP switch 39, the battery lamp 57 is held in the off state, all the indicator lamps 51 to 56 are extinguished when normal, and all are illuminated when abnormal.

When the above static test is completed, the capacity meter 49 displays the check lamp 50, the second and the sixth lamps as shown in FIG.
The switch input test standby state is entered with the indicator lamps 52 and 56 turned off.

In this switch input test, the brake switch 61, the parking brake switch 62, the lift switch 36a, the tilt switch 36b, the reach switch 36c, the forward limit switch 35a, and the reverse limit switch 35b are turned on / off to perform these functional operations. The presence or absence of such abnormalities is confirmed.

Below, from the brake switch 61 to the forward limit switch
When the operations up to 35a are operated in the above-mentioned order, the first indicator lamp 51 to the sixth indicator lamp 56 are turned on or off in order. That is, when the brake switch 61 is turned on, as shown in FIG.
When 51 is turned off and the park brake switch 62 and the forward limit switch 35a are turned on, as shown in FIGS. 12 (b) and (c), the second indicator lamp 52,
The seventh indicator lamps 57 light up to indicate that these switches 61, 62, 32a function normally. Then, when the reverse drive limit switch 35b is turned on, the check lamp 50 in the off state is turned on to display that there is no abnormality in the reverse drive limit switch 35b.

The switch input test described above is arbitrarily performed by the driver for the maintenance of the vehicle 1. When it is determined that the switch input test is unnecessary, the switch input test may be omitted and the analysis test described below may be directly performed.

After the static test is completed, when the capacity meter 49 is in the switch input test standby state, the lift lever and the tilt lever are simultaneously operated for 3 seconds to lift the lift switch 36a.
Also, when the tilt switch 36b is turned on, the analysis test of this stage starts. This analysis test is roughly divided into three stages,
Set the direction lever to the neutral position from the analog input test mode that is set when the analysis test mode is entered.
The contactor test and the chopper test of the main circuits M and P and the regenerative circuit E are sequentially performed by switching the forward drive position to the neutral position, turning on the forward drive limit switch 35a in the off state, and then turning it off again. .

In the analog input test mode described above, the analog input performed for each check item is A / D converted, and the converted value is displayed in binary or bar graph on the capacity meter 49. As shown in FIG. 4, the check lamp 50 is blinked, and the other lamps are all turned off.

The selection of the check item is executed by holding the lift lever in the non-operating position, turning the lift switch 36a off, and turning the tilt switch 36b on and off by switching the tilt lever. That is, the offset voltage value of the current sensor 14 is selected as a check item at the initial display of the capacity meter 49, and thereafter, the voltage of the traveling main circuit M, the offset voltage of the current sensor 12, the voltage of the cargo handling main circuit P, and the battery voltage. , Traveling accelerator voltage, cargo handling accelerator voltage, cargo handling offset duty, cargo handling soft start, tilt duty, reach duty, attachment duty, charging voltage,
Each item of the power controller volume and optional input is sequentially selected, and the capacity meter 49 displays the indicator lamp 51.
The display mode, that is, the code display for indicating the item selection by appropriately lighting up to 56 is performed.

When the items (1) to (3) are completed, the lift switch 36a is turned on by operating the lift lever, and the analog input test of the corresponding item is performed. Among the check items, the A / D display is a binary number display using the check lamp 50, the indicator lamps 51 to 56, and the battery lamp 57, and the other items are bar graph displays using the indicator lamps 51 to 56. Then, these A / D indications are converted in a conversion table to obtain measured values.

To give a concrete example of this analog input test, when the running main circuit voltage is selected in the item selection, the capacity meter 49 displays the 14th
As shown in FIG. 5A, the check lamp 50 is blinked and the third indicator lamp 53 is turned on to display the code. After confirming that there is no item selection error by this code display, the lift switch 36a is turned on to perform analog input. When the capacity meter 49 turns on the check lamp 50, the sixth indicator lamp 56, and the battery lamp 57 as shown in FIG. 14 (b) to display a binary number, the binary number conversion table 63 shown in FIG. By 34.18,
17.09, 0.27 are summed up to obtain a voltage value of 51.54, and it is confirmed whether this value is within a preset allowable range.

Further, when the cargo handling offset duty is selected as a check item, the capacity meter 49 displays a check lamp 50 and third to fifth indicator lamps 53 as shown in FIG. 16 (a).
Lights up to 55 and displays the code. After this, an analog input test was performed to display the capacitance meter 49 as shown in 16 (b).
When the 1,2 indicator lamps 51,52 are turned on, the numerical values 44,42 corresponding to the bar graph are read in the bar graph conversion table 65 shown in FIG.

When the analog input test is completed, the direction lever is operated to switch to the contactor test mode, and the capacitance meter 49 performs the initial display shown in FIG. 18 (a). In this contactor test, each test such as a forward contactor 18, a reverse contactor 19, a regenerative contactor 15, a bypass contactor 20, and a cargo handling contactor 8a is sequentially selected as a test item by operating the tilt lever.

That is, when the forward contactor 18 is selected as a check item in the initial display of the first half and the reverse contactor 19 is selected by operating the tilt lever, the capacity meter 49 displays
As shown in FIG. 18 (b), the first and third indicator lamps 51 and 53 are turned on while the check lamp 50 is blinking to display the code.

When a predetermined code is displayed according to the selection of the above check items, the corresponding contactor is turned on by operating the lever or the like. At this time, the other parts are held stationary and no noise is generated, and only the sound of making the contactor is confirmed by the driver. Then, when there is a normal making sound, it is recognized that the contactor is functioning normally. On the other hand, when there is no normal closing sound, abnormality of the contactor is confirmed, and the contact is inspected for damage.

After the contactor input test is completed, the chopper test mode is started by operating the direction lever.
As shown in Fig. 19 (a), the capacity meter 49 has a check lamp 50
The initial display of the chopper test is performed by blinking and the first and second indicator lamps 51, 52.

In this chopper test, the chopper functions of the traveling and cargo handling main circuits M and P and the regenerative circuit E are checked, and the tilt switch 36b in the off state is turned on by operating the tilt lever. The test items are selected by. When the running main circuit M is selected as a check item, the code display of the capacity meter 49 causes the check lamp 50 to blink and the first to third indicator lamps 51, 52, as shown in FIG. 19 (b). This is done by turning on 53.

Then, by switching the delay cushion lever back and forth, forward and reverse limit switches 35a,
35b is switched between the forward drive position and the reverse drive position, and the chopper test of the traveling main circuit M is started according to a predetermined program shown in FIG.

That is, simultaneously with the ON operation of the forward limit switch 35a, the CPU 27 outputs an ON signal to the traveling transistor 22 via the transistor drive circuit 46 to drive it in S7, and in S8 the CPU 27 causes the CPU 27 to output the voltage value of the transistor 22. Is within the proper range.

When the determination result in S8 is NO, in S9 the CPU 27 outputs a drive circuit abnormality signal to the capacity meter 49, and the capacity meter 49 uses the check lamp 50 and the sixth indicator lamp based on this signal.
56, the battery lamp 57 is turned on to display the first error [first
21 (a)]. From the first error display, it is confirmed that the traveling transistor 22 or the transistor drive circuit 45 has an abnormality, and appropriate error processing is performed by manual operation or the like.

On the other hand, if the determination result in S8 is YES, the current sensor in S10
It is determined whether or not the voltage value of 14 is within the proper range, and if NO, the CPU 27 determines in S11 that the sensor 14 is abnormal, and the check lamp 50 and the fifth and seventh indicator lamps of the capacity meter are determined.
The 54, 56 and the battery lamp 57 are turned on to display the second error [Fig. 21 (b)]. By this second error display,
It is confirmed that the current sensor 14 has an abnormality, and appropriate processing is performed as described above.

If the determination result in S10 is YES, the chopping operation is continued at the maximum duty of 20%, and when the forward / reverse limit switch is turned off, the CPU 27 outputs an end signal to the capacity meter 49 in S12. This capacity meter 49 is shown in Fig. 21 (c).
As shown in, the first to third indicator lamps 51, 52, 53 are turned on while the check lamp 50 is turned on, and the main driving circuit M is driven at the maximum duty.

After this, switch the direction lever to the neutral position,
When the forward and reverse limit switches 35a and 35b are turned off, the display shown in FIG. 19 (a) is displayed on the capacitance meter 49, as at the start of the chopper test of the main circuit M for traveling.
The initial display of the test of the cargo handling main circuit P is performed. After that, when the lift switch 36a is turned on by operating the lift lever, a test for the cargo handling transistor 11 and the current sensor 12 is performed in the same processing order as the test of the traveling main circuit M described above. The capacity meter 49 displays the first error and the second error in the states shown in FIGS. 22 (a) (b) (c).
Error display and test end display are performed respectively.

After completing the chopper test of the traveling and cargo handling main circuits M and P described above, turn on / off the tilt switch 36b,
Further, when the forward limit switch 35a is held on, the chopper test of the regenerative circuit E is executed according to the program shown in FIG.

In this test, at the same time when the forward limit switch 35a is turned on, an ON signal is output to the forward contactor 18 in S13, and the regenerative contactor 15 and the flywheel diodes 24, 25 are normally opened in S14. It is determined whether or not. When the determination result in S14 is NO, that is, when the regenerative contactor 15 is in the welded state and is closed, for example, the CPU 27 displays a third error message in S15, and the first and second indicator lamps 5
The third error display [FIG. 24 (a)] is displayed by the capacity meter 49 when all the lamps except 1,52 are turned on.

If the determination result in S14 is YES, whether or not the conduction of the regeneration transistor 23 and the regeneration register 23a is normal in S16 is determined by measuring the voltage of the transistor 22,
In the case of NO, the fourth error display [FIG. 24 (b)] by turning on all the lamps other than the first indicator lamp 51 in S17 is displayed by the capacity meter 49.

When the determination result in S16 is YES, in S18, the CPU 27 outputs a command to end the test to the capacity meter 49, and the capacity meter 49
The check lamp 50 of 49 blinks, and further, the indicator 49 shows a test end display [FIG. 24 (c)] in which the first, second and fourth indicator lamps 51, 52 and 54 are lit.

When the direction lever is moved to the non-actuated position after the chopper test of the regenerative circuit E is completed, the capacitance meter 49 again becomes the standby state display shown in FIG. 19 (a).

By properly combining the various item tests in the analog input test, contactor test, and chopper test described above, the cause of the abnormality in the electric system of the vehicle 1 can be clearly understood. An example will be described below.

When there is an abnormality in the traveling main circuit M, a contactor test is performed to regenerate the contactor 15, the forward contactor 18,
Each of the reverse contactors 19 is checked. When there is no sound of making any of these contactors 15, 18, 19 it is confirmed that the corresponding contactor 15, 18, 19 is abnormal.

When the sounds made by all the contactors 15, 18, 19 are confirmed, the voltage of the traveling main circuit M is measured by the analog input test. When the measured voltage value is within the allowable error range with respect to the preset standard voltage value, the running main circuit M is checked by the chopper test,
The error display of the capacity meter 49 confirms that the traveling transistor 22 or the transistor drive circuit 45 is abnormal. Also,
When there is no error display, it can be seen that the CPU 27 has an abnormality.

The analysis test described above is performed according to a preset program by turning on / off the lift switch 36a, the tilt switch 36b, and the like. Therefore, it is not necessary to perform a test on an analyzer device provided separately from the vehicle 1 via different connectors for each part of the electric system of the vehicle 1, and complicated work is avoided.

In addition, by configuring various tests to be performed based on the standard data for each part stored in ROM28, the data of all parts of the electrical system that need to be checked are stored in ROM28.
When stored in, unlike the conventional product in which each part is output to the outside through the connector, the check items are not limited.

Further, in the analysis test, the switches used for switching various tests and selecting items in each test are tested first, so that the tests are performed smoothly.

In addition, since the analog input value of the input portion is digitally displayed on the capacitance meter, the actually input numerical value is surely recognized.

In addition, a battery capacity meter installed on the forklift
Since 49 is used as an indicator of the failed part, it is economical because there is no need to newly install an indicator member.

EFFECTS OF THE INVENTION As described above in detail, according to the present invention, it is possible to uniformly check the abnormality of all electric system parts by the function of the vehicle, and further, it is possible to easily perform the abnormality analysis work. Exert.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electric control configuration of the present invention,
2 (a) is an electric circuit diagram showing a main circuit for traveling and cargo handling, FIG. 2 (b) is an electric circuit diagram showing a regenerative circuit, FIG. 3 is a side view showing a forklift, and FIG. Is a front view showing the battery capacity indicator, FIG. 5 is a flowchart for carrying out the self-diagnosis mode, and FIG.
(D) is a front view showing a capacitance meter for displaying an abnormality of a main part in the self-diagnosis mode, FIG. 7 is a front view showing the capacitance meter when the analyzer mode is activated, FIG. 8 (a) (b), FIG. 9 (a), (b) and (c), and FIGS. 10 (a), (b) and (c) are front views showing a capacitance meter for displaying an abnormality of a main part during a static test, respectively.
FIG. 11 is a front view showing a capacitance meter performing a switch input test standby display, and FIGS. 12 (a) to (c) are front views showing a capacitance meter performing an abnormality display in various items during a switch input test, respectively. Fig. 13 is a front view showing a capacitance meter for initial display of analog mode input, and Figs. 14 (a) and (b) are item selection mode displays and 2 in the analog input test.
A front view showing a capacitance meter for digital display of a base number, FIG. 15 is a partially cutaway front view showing a binary conversion table, and FIG. 16 (a).
FIG. 17 (b) is a front view showing the capacitance meter for displaying the item selection mode and the bar graph in the analog input test, FIG.
The figure shows the front view of the bar graph conversion table, Fig. 18 (a).
(B) is a front view of the capacity meter showing item selection during the contactor test, FIG. 19 (a) is a front view of the capacity meter performing initial display of the chopper test, and FIG. 19 (b) is a traveling and cargo owner. Front view showing a capacitance meter for selecting and displaying the chopper test of the circuit, FIG. 20 is a flow chart showing the operation of the CPU for carrying out the chopper test of the running main circuit, and FIGS. 21 (a) (b) (c). Is the front view of the capacity meter that displays the error and end display of the running main circuit chopper test, respectively.
22 (a), (b) and (c) are front views of the capacity meter that displays the error and end display of the cargo handling main circuit chopper test, respectively, and FIG. 23 shows the operation of the CPU for carrying out the chopper test of the regenerative circuit. Fig. 24 (a) is a flow chart showing it.
(B) (c) is a front view of the capacity meter which performs an error display and an end display of a regenerative circuit chopper test, respectively. CP as self-diagnosis means, instruction means and display control means
U27, ROM 28 as instructing means, traveling accelerator sensor 30 and cargo handling accelerator sensor 31 as input means, battery capacity meter 49, indicator lamps 51 to 56 as light emitting parts, cargo handling main circuit P and driving main as driving means Circuit M.

Claims (1)

[Claims] 1. A battery vehicle comprising a plurality of light emitting parts and the like provided in a driver's seat and provided with a battery capacity indicator for displaying the capacity of the battery based on the number of light emission of the plurality of light emitting parts. And a self-diagnosis means for diagnosing whether the input means, the instruction means, and the driving means for cargo handling normally operate, and a capacity display state when the self-diagnosis means judges an abnormal portion. A self-diagnosis device for a battery vehicle, comprising: a display control unit that appropriately selects a plurality of light emitting units of a certain battery capacity meter and gives a display instruction corresponding to the abnormal portion.