JP2890070B2 - Vehicle failure management system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to failure display of a plurality of components of a vehicle such as a construction machine, storage of a failure history,
The present invention relates to a vehicle failure management device that performs monitoring.

[0002]

2. Description of the Related Art FIG. 6 shows the construction of a conventional fault display and diagnosis system for construction machines.

As shown in FIG. 6, in the conventional apparatus, the control of the construction machine is divided into a plurality of controllers, and it is determined for each controller that a device in charge of each controller is faulty, and the fault is determined. When a failure occurs, a signal indicating that a failure has occurred is transmitted to a display device such as a monitor panel.

[0004]

In this case, since the history of the failure is not taken in the conventional apparatus, when a failure occurs, the operator connects the sensor or actuator of each controller to the sensor or the actuator in order to investigate the cause of the failure. Although a T-branch or the like is connected to the connection part to check the signals (current, voltage, etc.) of the sensor or actuator, when using the T-branch, it is necessary to disconnect the connector once and connect the T-branch. There was a drawback that failures such as poor contact of the connector part were difficult to find. Also, in the conventional device, it takes a lot of time to pursue the cause,
There is a problem that the machine has a long downtime and the user has a large loss.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a vehicle failure management device that can easily and quickly find a failure whose cause is difficult to find, thereby shortening maintenance time and increasing efficiency. The purpose is to provide.

[0006]

According to the present invention, a plurality of controllers to which sensors or actuators are connected are connected to a master controller via a communication network, and each controller detects a failure of a sensor or an actuator which is in charge of each controller. Each controller is provided with a failure detection device for transmitting failure data indicating an item, and timer means for measuring an elapsed time after receiving failure data from each controller, and each failure item from each controller, A memory for storing and storing failure information including the elapsed time corresponding to the failure item, a display for displaying the failure information, and an operation instruction for sequentially displaying the failure information stored and stored in the memory on the display. Operating means are provided in the master controller.

[0007]

According to the configuration of the present invention, each controller periodically transmits failure data indicating whether or not a failure has occurred in a sensor or an actuator assigned to each controller to the master controller. When the occurrence of a failure is detected, a failure code corresponding to the failure and failure information including the elapsed time of the failure are stored in a memory. The stored failure information is immediately displayed on the display depending on the content of the failure, and the stored information is sequentially read out and displayed by a predetermined operation via the operation means.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows an embodiment of the present invention. This embodiment is mounted on a construction machine such as a power shovel.

Various sensors and actuators in the construction machine are divided and connected to a plurality of controllers 1 to n. Each of the controllers 1 to n has a fault for detecting a failure of the sensor or actuator connected to the controller. Each has a detection unit.

The plurality of controllers 1 to n are connected to a master controller 10 via a network communication bus BS.
It is connected to the. The master controller 10 includes a network interface unit 11, a CPU 12, a monitor operation panel 13, and a memory 14.

The failure detectors of the controllers 1 to n constantly detect various failures of sensors and actuators assigned to the controllers, and transmit failure data as shown in FIG. 3 to the master controller 10, for example.
The failure data in FIG. 3 assumes the pump controller of the power shovel shown in FIG. 2 as one controller, and an engine rotation sensor 20 and a pressure sensor 21 are connected to the pump controller as sensors.
A solenoid 22 for controlling a hydraulic valve is connected as an actuator.

The failure items in this pump controller are as follows, and these failure items are assigned to one bit each to form 4-byte failure data of NO1 to NO4.

[0014] The traveling 2-speed switching solenoid is short-circuited. • The two-stage relief solenoid is short-circuited. • The diverging solenoid is short-circuited. • The turning brake solenoid is short-circuited. • The limit switch is separated solenoid. Disconnection solenoid disconnection ・ Turning brake solenoid disconnection ・ Limit switch disconnection solenoid disconnection ・ Service solenoid disconnection ・ Auto decel output failure ・ Rotation sensor failure ・ Pressure sensor power failure ・ Second pressure sensor failure ・ First pressure sensor failure ・ Limit switch EPC solenoid disconnection • Limit switch EPC solenoid short circuit 2 • Limit switch EPC solenoid short circuit 1 • TVC2 valve solenoid disconnection • TVC2 valve solenoid short circuit 2 • TVC2 valve solenoid short circuit 1 • TVC Valve solenoid disconnection • TVC1 valve solenoid short circuit 2 • TVC1 valve solenoid short circuit 1 That is, when a failure occurs in a certain failure item, each of the controllers 1 to n sets the bit in the failure data corresponding to the failure item in which the failure occurred to “ 1 "and transmits it to the master controller 10.

The CPU 12 of the master controller 10
By using the polling method, the failure data from the plurality of controllers 1 to n is periodically received sequentially via the network interface 11 and whether or not there is a bit in which “1” is written in the received failure data is determined. Is checked, and if there is a bit in which “1” is written, an error code corresponding to the failure item of this bit (for example, “15” added below each failure item in FIG. 3,
Write a code such as “2E” into the memory 14. As shown in FIG. 4, the memory 14 has an area for accumulating and storing a plurality of failure items (in this case, 20 items). One failure item storage area includes an error code storage area for storing an error code and an error code storage area. And a time data storage area for storing time data indicating the elapsed time from the occurrence of the failure of the corresponding failure item. Further, the memory 14 has a failure item number data storage area for storing failure item number data indicating the number of currently occurring failure items, and a sum check data for storing sum check data for performing a sum check of the error code. Has a data storage area.

When writing an error code in the memory 14, the CPU 12 checks whether the error code to be written is already written in the memory,
Only an error code different from the error code already written in the memory 14 is stored in the new storage area of the memory 14. Further, error codes are written in the failure item storage areas 1 to 20 for 20 items in the memory 14 in the order in which the failure first occurred, and when the storage area for 20 items becomes full, the oldest failure is determined. The corresponding failure data is updated with the failure data corresponding to the newest failure.

When writing an error code into the memory 14, the CPU 12 initializes the time data storage area of the writing area to zero, starts a time counting operation from the time when the error code is written, and sets a predetermined time ( Each time one hour elapses, the elapsed time up to that time is written to the time data storage area. Of course, when a plurality of failures occur in parallel,
U12 counts the elapsed time for each failure. In this manner, the memory 14 is stored in each controller 1 at that time.
To n and the elapsed time thereof are accumulated and stored.

For a serious failure item (for example, a failure item marked with a star in FIG. 3) that may cause a malfunction or breakage of the machine, the CPU 12 issues an alarm to instruct the operator to take necessary actions. While the buzzer 15 sounds, an error code or the like is displayed on the display unit of the monitor operation panel 13. For example, if the turning brake is short-circuited or disconnected, an error code such as "E: 03 (meaning that a turning redundant switch (a switch that enables turning) is turned on)" is displayed.

The above is the operation for centrally managing, storing, and urgently displaying the failure items.

Next, the failure history reference mode will be described with reference to the flowchart of FIG.

The monitor operation panel 13 is provided with eight switches SW1 to SW8 as shown in FIG.
SW1 is a master switch.

When none of these switches SW1 to SW8 is turned on, the current time is displayed on the display section of the monitor operation panel (clock display mode, step 130).

The eight switches SW1 to SW
8 of the master switches SW1 and SW2 at the same time
When the button is pressed for more than a second, the mode shifts to the failure history display mode, and the error code of the failure item number 1 in the memory 14 and the elapsed time thereof are displayed. In this failure history mode, if the number of failure items in the memory 14 is 0, "no failure" is displayed on the display unit. When a plurality of failures have occurred, if the master switch SW1 and the switch SW3 are simultaneously turned on thereafter, the error code of the next failure item number and the elapsed time thereof are displayed. Subsequently, by sequentially turning on the master switch SW1 and the switch SW3 simultaneously, the error code of the next failure item number and the elapsed time thereof are sequentially displayed (failure history display mode, steps 120, 140 to 190). ).

When clearing all the failure histories stored in the memory 14, when the key switch of the vehicle is turned, the master switch SW1 is kept pressed for more than 5 seconds (failure history clear mode). , Steps 100-
110).

The clock display mode and the failure history display mode are also operations performed after the key switch of the vehicle is turned. In the failure history display mode, when returning the failure item number (display in reverse order), the master switches SW1 and SW4 are operated simultaneously.

Further, in the present apparatus, vehicle information such as engine speed and pressure sensor output voltage can be displayed on the monitor operation panel 13. That is, if the master switches SW1 and SW5 are simultaneously pressed for three seconds or more, the mode is switched to the vehicle body information display mode, and the vehicle body information specified by the operator can be arbitrarily displayed.

That is, vehicle information such as engine speed and pressure sensor output voltage is input to each of the controllers 1 to n in addition to the failure items.
When the mode shifts to the vehicle body information display mode by the simultaneous operation of the master switches SW1 and SW4, the master controller issues a command to the controller in charge of the vehicle body information of the item number designated by the operator (item numbers are assigned to each body information). Send this item number. The controller having received the item number returns the vehicle body information corresponding to the received item number to the master controller 10. The master controller 10 displays the received vehicle information on the display of the monitor operation panel 13.

When the operator designates the item number of the vehicle body information, the master switches SW1 and SW3 are simultaneously operated to advance the item number, and to return the item number, similarly to the failure information. SW1 and SW4
To operate simultaneously. This body information display mode can be performed in parallel with the normal operation of the construction machine's mode switch (work mode, travel mode, etc.), so the work mode can be switched while looking at the body information. In addition to shortening the time, it is possible to easily confirm a transitional change in vehicle body information when the work mode is changed.

In the above embodiment, the master controller 10 and the plurality of controllers 1 to n are connected via the network bus. However, the master controller 10 may be connected via a single serial communication line. . Further, the master controller 10 may be provided with a function of calculating the frequency of occurrence for each failure item, and the calculated failure frequency may be stored in the memory 14 in association with the failure item. In the above embodiment, the time data storage area is updated every predetermined time. However, the time data storage area may be constantly updated.

[0030]

As described above, according to the present invention,
Each controller is connected by a network centering on the master controller, and the failure history of each controller is recorded by the master controller. The efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 illustrates an example of a controller.

FIG. 3 is a diagram exemplifying failure data;

FIG. 4 is a diagram showing a storage mode of a memory.

FIG. 5 is a flowchart illustrating an operation example of a failure history reference mode.

FIG. 6 is a diagram showing a conventional device.

[Explanation of symbols]

 1 to n Controller 10 Master controller 11 Network interface 12 CPU 13 Monitor operation panel 14 Memory 15 Alarm buzzer

Claims (3)

(57) [Claims] A plurality of controllers to which sensors or actuators are connected are connected to a master controller via a communication network, each controller detects a failure of a sensor or an actuator in charge, and transmits failure data indicating each failure item. A timer means for measuring the elapsed time from receiving the failure data from each controller while providing a failure detection device in each of the controllers, each failure item from each of the controllers and the elapsed time corresponding to this failure item A memory for accumulating and storing failure information including: a display for displaying the failure information; and an operating means for giving an operation instruction for sequentially displaying the failure information accumulated and stored in the memory on the display. A failure management device for a vehicle, comprising: 2. The vehicle fault management device according to claim 1, wherein the fault information stored in the memory includes an error occurrence frequency. 3. The master controller is provided on a monitor panel of a vehicle, and an operation instruction for sequentially displaying the display items is given by performing a composite operation of switches arranged on the monitor panel. Or the failure management device for a vehicle according to 2.