JPH01196532A - Self diagnosis device for battery-operated vehicle - Google Patents

Abstract

PURPOSE:To enable display of abnormal contents even after natural restoration of an abnormal part, by holding the abnormal part into a memory holding means comprising a nonvolatile memory when a self diagnosis means has judged it to display the memory contents. CONSTITUTION:A key switch SW, a mode selection switch 14, operators 7-9, a battery depression detector 18, an hour meter 22 and various depression detecting sensors 27 are connected to a CPU19. In a diagnosis, the CPU19 performs a self diagnosis of abnormality of an electric system according to a diagnosis program stored in a ROM 22. Then, when abnormality is recognized, the CPU19 displays the results thereof. It is so arranged that abnormality is stored into an EEPROM23 together with the time at which it is generated and abnormal parts recorded is displayed sequentially by switching a switch SW over to a record display position. This enables display of abnormal contents even after natural restoration of the abnormal parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a self-diagnosis system for battery vehicles.

[Conventional technology]

Generally, in a self-diagnosis device for a battery-powered industrial vehicle, an abnormal part is detected by using a microcomputer to detect a difference between a voltage value of each electrical part and a preset value. When an abnormal part is detected, the details of the abnormality are displayed on the display device according to instructions from the microcomputer, and the operator is made aware of this.

[Problem to be solved by the invention]

However, in the self-diagnosis device described above, minor abnormalities such as poor contact of contacts may be spontaneously repaired during work ma, and although the abnormality is displayed once, the display disappears when the repair is completed. Therefore, if the operator neglects to visually check the display, it becomes impossible to confirm the faulty part. Then, when the power is turned off, the contents stored in the working memory of the microcomputer are erased, so the abnormality will no longer be displayed, and even though the relevant part has the cause of the failure, the abnormality will not be detected. Unchecked, leaving a vehicle maintenance issue.

This invention was made in order to solve the above-mentioned problems, and its purpose is to make it possible to confirm the abnormality even after the abnormal part has been repaired naturally, and to provide a battery-powered vehicle that is effective for vehicle maintenance. The objective is to provide a diagnostic system.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a self-diagnosis means for diagnosing whether or not an electric part for traveling and cargo handling operates normally, and a control means when the self-diagnosis means determines that an abnormal part is present. display means for displaying the abnormal parts according to a signal from the self-diagnosis means; The present invention has mode switching means for switching to a mode for instructing display of the storage contents of the storage means and for causing the display means to display the storage contents of the storage means.

[Effect]

By employing the above-described means, the present invention stores the abnormality determined by the self-diagnosis means in the storage means even after the power is turned off. After the mode switching means switches the mode of the control means, the contents stored in the storage means are displayed on the display means.

〔Example〕

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

In FIG. 2, a standing forklift vehicle 1 is provided with a drive wheel 2 at its rear, and a mast 3 provided at its front supports a fork 4 that is raised and lowered along the mast 3.

Further, a microcomputer M is housed in the storage case 5, and a steering wheel 6 and an accelerator lever 7 are provided on the top surface of the microcomputer M, as well as a lift lever 8.
, tilt lever 9, and other various operating devices for cargo handling are provided. Then, by operating the accelerator lever 7, the driving wheels 2 of the vehicle 1 are rotated via the running motor 10 shown in FIG. 1, and the vehicle 1 runs in the direction selected by rotating the steering wheel 6. Furthermore, by operating the lift lever 8 and the tilt lever 9, a known electromagnetic switching valve in the cargo handling hydraulic circuit is controlled, so that the lift cylinder 12
and tilt cylinder 13 (FIG. 1) are extended and contracted to perform various cargo handling operations such as raising and lowering the fork 4 along the mast 3 and tilting the fork 4.

Further, as shown in FIG. 3, an instrument panel P is provided on the upper surface of the storage case 5, including a key switch SW for starting and stopping the vehicle 1, a mode changeover switch 14 as a mode changeover means, and a display. A Pufftelli capacity meter 15 and a digital clock 16 are provided as means.

This battery capacity meter 15 is provided with one tie, a clamp 24, six indicator lamps 25 arranged on the left and right, and one battery lamp 26 provided at the bottom. These lamps 24 to 26 are formed of light emitting diodes,
The lamps 24 to 26 emit light in yellow, green, and red, and when the key switch SW is turned on, all the lamps 24 to 26 light up for two seconds, thereby confirming that there is no failure in the lamps 24 to 26.

The mode selector switch 14 is switched between a normal working position shown by a solid line and a recording display position shown by a two-dot chain line. are digitally displayed by extinguishing them one by one from the F side (no discharge side) to the E side (full discharge side). When the remaining capacity of the battery exceeds a preset allowable remaining value, the pantry lamp 26 lights up to display a warning as shown in FIG. 4 (a).

Further, in the above state, an abnormality is periodically searched for in the electrical system, and when there is an abnormality, the check clamp 24 is turned on as shown in FIG. 4(b), and at the same time, the battery capacity meter 15 is The display function is temporarily stopped, one or more indicator lamps 25 are selected according to the search results, and a self-diagnosis display is performed to display abnormal parts in a predetermined lighting display mode corresponding to each part. .

Furthermore, when the mode selector switch SW is switched to the record display position, the indicator lamps 25 are lit corresponding to each part in the same display mode as when displaying self-diagnosis, and the record of the part where there was an abnormality before is displayed. I do. Note that when the battery capacity meter 15 displays the record, the clock 16 displays the time when the abnormality occurred in the corresponding part.

FIG. 1 shows the electrical configuration of this invention. That is, the key switch SW and the mode changeover switch 14 are each connected to the microcomputer M. Further, the microcomputer M is connected to a traveling operating device such as the accelerator lever 7, and a cargo handling operating device such as the lift lever 8 and tilt lever 9 through an angle detection sensor 17 that detects the amount of operation. , a battery voltage detector 18, an hour meter 22, and a group of various voltage detection sensors 27 are connected.

The microcomputer M includes a central processing unit (hereinafter referred to as CPU) 19 as a self-diagnosis means and a control means;
The read-only memory (R
The CPU 19 includes a drive motor 10, a lift cylinder 12, a tilt cylinder 13, and a battery capacity meter 1.
5, a clock 16, and an abnormality recording memory (EEPROM) 23 as a nonvolatile storage means are connected to each.

Then, when the key switch SW is operated and the mode changeover switch 14 is in the normal working position, the CPU 20
According to the control program stored in the M 20, it operates in the normal work mode and detects the angle as the accelerator lever 7 and other travel operation devices and the lift lever 8 and tilt lever 9 and other cargo handling operation devices are operated. Based on the operation amount signal output from the sensor 17, a signal for traveling or cargo handling work is output to control devices such as the travel motor 10, the lift cylinder 12 and the tilt cylinder 13 of the cargo handling hydraulic circuit to drive these. . Furthermore, according to the voltage value detected by the battery voltage detector 18, a signal is output to the battery capacity meter 15, and the indicator lamps 25 of the capacity meter 15 are turned on in the number corresponding to the detected voltage value to check the remaining capacity of the battery. Display.

In addition, by inputting the key switch SW, the CPU 19
performs a self-diagnosis to search for abnormalities in the electrical system according to a diagnostic program stored in the ROM 20. That is, when the voltage of the electrical part is detected by the various voltage sensor groups 23, a voltage detection signal is output to the CPU 19. Then,
Based on this detection signal, the CPU 19 reads data on each reference voltage value stored in the ROM 20, and compares the voltage value obtained at that time with this reference voltage value to determine whether there is an abnormality in the electrical system. Even during this self-diagnosis operation, the battery capacity meter 15 displays the remaining capacity of the battery according to the battery voltage value detected by the battery voltage detector 18. As mentioned above, when an abnormality is detected in the electrical system,
CPU1 according to the program stored in ROM20
9 is converted from a mode that instructs to display the battery capacity to a mode that instructs to display abnormal parts, and the battery capacity meter 1
5 to perform a self-diagnosis display.

The abnormality detection result of the CPU 19 during the self-diagnosis operation of the CPU 19 is converted into data together with the time when the abnormality occurred as measured by the hour meter 22, and is sequentially stored in the EEPROM 23. When the entire storage area of the EEPROM 23 is filled with data, the input data is written over the oldest data.

When the changeover switch SW is switched to the record display position, the CPU 19 is switched to a mode in which the contents of the EEPROM 23 are displayed according to the program stored in the ROM 20, and the display of remaining battery capacity or self-diagnosis of the battery capacity meter 15 is stopped. The abnormal parts stored in the EPROM 23 are sequentially displayed, and furthermore, the display of the current time of the clock 16 is stopped and the time when this abnormality has occurred is displayed.

Now, the operation of the self-diagnosis system configured as described above will be explained with reference to FIG.

When the mode changeover switch SW is set to the self-diagnosis position in step Sl (hereinafter simply referred to as S), the CPU 19 selects the various voltage sensors 2 and 2 in S2.
7 reads the voltage value of each electrical part detected. And S
In step 3, these voltage values are compared with the reference voltage value stored in the ROM 20, and it is determined whether the difference between the two values exceeds an allowable range. If this judgment result is YES, this abnormal part is converted into data in S4 and EEFRO
The abnormality is displayed by appropriately selecting and lighting the indicator lamp 25 of the battery capacity meter 15 in S5, and then the process returns to Sl and detects the position of the mode changeover switch SW. In addition,
If the determination result in S3 is No, the process returns to Sl.

If the mode changeover switch SW is set to the recording display position in Sl, the CPU 19
reads data regarding past electrical system abnormalities stored in the EEPROM 23.

After this, in accordance with the data read from the EEPRO, M23, in S7, the electrical parts that have had abnormalities in the past are sequentially displayed on the battery capacity meter 15, and the time when this abnormality occurred is displayed on the clock 16, and then Return to Sl.

Since the EEPROM 23 in this embodiment is a non-volatile memory, the stored contents are preserved without being erased even after the key switch SW is turned off. and,
If you input the key switch SW again, the EEFROM
23, new electrical system abnormalities are sequentially stored following the previous data. And the mode changeover switch 14
By the switching operation, these data are read out by the CPU 19, and a record display based on this is made on the battery capacity meter 15, so that past abnormalities in the electrical system can be easily confirmed even after the key switch SW is turned off.

In addition, even if a minor abnormality such as a contact failure is repaired naturally while the vehicle 1 is in operation, the abnormality detected once will become EE.
This is stored in the PROM 23 and displayed on the battery capacity meter 15. Therefore, the maintenance of the electrical system can be ensured by confirming the location of the defective factor.

Furthermore, when the battery capacity meter 15 performs the memory display, by displaying the time when this abnormality occurred on the clock 16, the work content of the vehicle 1 can be confirmed retroactively to the time when the abnormality occurred, and It becomes possible to analyze the reason.

The present invention is not limited to the embodiments described above; for example, (1) the hour meter 22 is omitted and the time measured by the clock 16 when an abnormality occurs is directly transmitted to the EEP via the CPU 16;
Arbitrary changes can be made without departing from the spirit of the invention, such as storing it in the ROM 23 or applying it to various battery vehicles other than forklifts.

Effects of the Invention As described in detail above, according to the present invention, the details of the abnormality can be displayed even after the abnormal part has been naturally repaired, and the excellent effect of being effective in maintaining the vehicle is exhibited.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the electrical configuration of this invention, Figure 2 is a block diagram showing the electrical configuration of this invention.
The figure is a side view showing a standing forklift, Fig. 3 is a plan view showing the instrument panel, Figs. It is a flowchart showing the operation of CPU#. A mode changeover switch 14 as a mode changeover means, a battery capacity meter 15 as a display means, a CPU 19 as a control means and self-diagnosis means, and an EE as a memory storage means.
PROM23゜Patent Applicant Toyota Industries Corporation Representative Patent Attorney On 1) Hiroshi N.
Figure 4 (a) Figure 4 (b)

Claims (1)

[Scope of Claims] 1. Self-diagnosis means for diagnosing whether or not electrical parts for traveling and cargo handling operate normally; and when this self-diagnosis means determines an abnormal part, according to a signal from the control means. In a battery vehicle equipped with a display means for displaying the abnormal part, the storage storage means made of a non-volatile memory sequentially stores the abnormal parts determined by the self-diagnosis means, and the control means for displaying the abnormal part. A self-diagnosis system for a battery-powered vehicle, comprising mode switching means for switching from an instructing mode to an instructing mode for displaying the stored contents of a memory storing means, and displaying the stored contents of the memory storing means on a display means.