KR0136225B1 - The diagnostic apparatus and method for constructional apparatus controller - Google Patents

Abstract

Is it necessary to replace the controller by judging by itself whether the controller is functioning properly for the controller that is in charge of the whole function of the construction equipment, and prompting the equipment user or A / S man to judge the failure of the controller itself. Otherwise, it is a controller error diagnosis device and diagnostic method for prompt processing of the trouble spot in case of equipment failure by identifying failures related to other parts or sensors.Integrator, low frequency oscillator and minutes for signal processing An abnormality diagnosing device of an electrical circuit comprising a controller abnormality diagnosing circuit composed of a period, a comparison circuit, and an abnormality determining circuit installed in a control unit, and transmitting a signal warning the abnormal state through the abnormality diagnosing circuit to an abnormality diagnosis indicator of an output unit And abnormal diagnostic method.

Description

Fault diagnosis device and diagnostic method of construction equipment controller

1 is a block diagram of the diagnostic control signal processing system of the present invention,

2 is a detailed block diagram of the abnormal diagnostic apparatus of the present invention,

3 is an electric circuit diagram of an embodiment of an abnormality determination circuit of the apparatus of the present invention.

Explanation of symbols on the main parts of the drawings

1 input unit 2 control unit

3: output part 4: diagnostic circuit

5: central processing unit 6: control unit fault diagnosis circuit

12: diagnostic output unit 13: fault diagnosis indicator

The present invention is to quickly diagnose the circuit abnormality in the central processing unit (CPU) of the electrical operation unit of the construction equipment or the controller (controller) that performs the electronic control function to display the fault condition and the location of the fault. The present invention relates to an abnormality diagnosis device for a controller and a method for diagnosing the same.

In the construction equipment such as the excavator, when a breakdown or short circuit occurs on the monitor, controller, sensor, or other electrical equipment during start-up or operation, the comparator of the controller's internal circuit compares the reference voltage and the voltage when the abnormality occurs. Sends an error signal such as disconnection or short to the central processing unit (CPU) of the control unit, and determines the abnormality in the central processing unit, and then outputs the error signal to an output means having a display function such as an LED or a 7-segment LED. Not only the user can detect the presence of abnormality by sending the abnormality site was also found by the combined output signal from the LED.

However, if an abnormality occurs in the central processing unit due to unknown electronic noise or a defect in the CPU itself, the conventional central processing unit detects and displays the abnormality caused by the command signal. Since the function is paralyzed and the operator cannot know the exact fault portion, the diagnosis apparatus substantially loses its original function, and in this case, there was a significant problem in finding and repairing the fault.

In addition, Japanese Patent Application Laid-open No. Hei 2-7199 is a known related art. In the conventional invention, a diagnosis computer and a control computer are separately provided in a controller, and an abnormal state is diagnosed by comparing data in both computers. Since it is configured to do so, in the controller having only a central processing unit (microcomputer) there is a problem that can not diagnose itself if the microcomputer itself is abnormal.

In addition, there is another related technology, Korean Patent Publication No. 92-9027, which checks the operation of the microcomputer to detect and detect the cause of failure when the operation of the computer control system is abnormal and to improve the economics and maintenance. It is configured to display the data contents of the input / output ports and registers with the micro computer through the display system. Therefore, the user should judge the abnormality of the computer control system, that is, the controller, and when the diagnosis function of the computer system is lost. Information on each component's abnormality can be viewed only by external operation, and the user has no choice but to determine the abnormality. If the abnormality occurs in the computer control system, that is, the microcomputer itself, which is a key element inside the controller, Discard each data content There is a problem that can not even determine whether the signal is normal or abnormal because it can not even play.

In order to solve the above problems, the present invention diagnoses whether the central processing unit itself detects an abnormality so that the user can quickly detect and repair the equipment even when the construction unit is started or during the operation. The method of diagnosing the abnormality through the comparator and the like by the signal from the electrical circuit fault diagnosis device and the central processing unit with the indicator to warn the circuit and the fault condition was devised.

Hereinafter, described in detail by the accompanying drawings as follows.

FIG. 1 is a block diagram of a diagnostic control signal processing system of the fault diagnosis apparatus of the present invention, FIG. 2 is a detailed block diagram of the fault diagnosis apparatus of the electric circuit of the present invention, and FIG. 3 is an electric circuit diagram of an abnormality determination circuit of the device of the present invention.

In FIG. 1, the central processing unit 5 of the control unit 2 performs a self-diagnosis function against a signal of an input unit 1 indicating a disconnection or internal damage state on a line from an electric operation unit such as a work switch or a sensor. In the conventional abnormality diagnosing device which outputs an abnormal signal to the output unit 3 having a status display function, it is continuous from the central processing unit 5 to detect and troubleshoot whether or not the central processing unit 5 itself is abnormal. An abnormality diagnosis circuit 6 of a control unit that receives and sends an ordinary signal is attached to the control unit 2, and a signal for warning that an abnormal state is transmitted through the control unit abnormality diagnosis circuit 6 is an abnormality diagnosis indicator 13 of the output unit 3. It is configured to be delivered to.

The controller abnormal diagnosis circuit 6 includes an integrator 7 and a low frequency oscillator 8 and a divider 9 for signal processing in the two devices 7 and 8, as shown in FIG. Comprising a comparison circuit 10 that can be contrasted with the input range value of the normal state and the abnormality determination circuit 11 for determining whether or not the normal state, the abnormality determination circuit 11 is the center as shown in FIG. If the processing device 5 is normal, the signal determination input unit 0 of the comparison circuit sends out a signal of a certain level during high low, and if abnormal, high is emitted. The signal judging output section 9 outputs the signal high inverted by the signal judging input section 0 back to low, and this signal and the high signal always output from the abnormal signal output section q are low signals due to OR logic on the circuit. This low signal enters the diagnostic output section 12 and displays the fault diagnosis. The number 13 is displayed on the instrument 13 in a normal operating state.

If the central processing unit 5 is abnormal, a high signal enters the signal determination input unit 0, and the signal becomes high regardless of the high signal of the signal determination output unit 9, and this signal becomes the diagnostic output unit 12. The central processing unit 5 displays the number or letter of the abnormal signal on the abnormality diagnosis indicator 13 through). However, when the signal input to the signal determination input unit 0 is abnormally operated, the abnormality display 13 directly indicates that the central processing unit 5 is abnormal by the output signal of the abnormal signal output unit q.

The operation method of the present invention configured as described above is as follows.

When the program is executed when the control unit 2 is operated, pulse output high and low clock signals are continuously output from the output terminal of the central processing unit 5, which is a signal of a constant level through the integrator 7. The signal output through the integrator (7) enters the divider (9) and controls the signal output from the low frequency oscillator (8). The signal is outputted to detect the occurrence of abnormality by the abnormal judgment circuit 11 at a moment by determining whether the abnormality has occurred, and when the abnormal signal is continued, the abnormal judgment circuit 11 has a practical abnormality in the central processing unit 5. It is determined that the error has occurred and sends an error occurrence signal to the diagnostic output unit 12, by this signal outputs the error occurrence signal from the error diagnosis indicator 13 composed of a general LED or 7 segment LED.

In more detail, when an abnormality occurs due to a program momentary deviation, the continuous pulse type high and low clock signals generated by the central processing unit 5 itself are integrated in the integrator 7 and converted into a high signal. The high signal outputs the low frequency oscillator 8 low signal from the divider 9, and resets the central processing unit 5 in m · sec units by the output signal from the comparison circuit 10. Normally, however, if an abnormality occurs in the central processing unit 5, only a low signal is continuously output. Accordingly, the low signal is integrated in the integrator 7 and converted into a low signal. The high signal of 8) is outputted, and according to this signal, the comparison circuit 10 sends an abnormal occurrence signal to the abnormal determination circuit 11, and when the abnormal occurrence signal continues, the abnormal determination circuit 11 outputs the diagnostic output unit. this Therefore send a signal generated by the signal, which will be alert to the user such that the at least Diagnostic period 13 the central processing unit is in the abnormal state.

As described above, in the controller having only the central processing unit (microcomputer), when an abnormality occurs in the microcomputer itself, the electric circuit is configured to diagnose the abnormal state by itself. It is possible to easily diagnose not only the fault condition of but also the fault condition of the microcomputer.

In addition, when the central processing unit (microcomputer) inside the controller loses its own function, it configures a separate circuit to diagnose and display it, and configures the circuit to directly inform the external user of the status. As the user immediately recognizes the cause of the abnormality, the user can quickly find and repair the fault.

Claims (3)

An abnormal condition is displayed by performing a self-diagnosis function by the central processing unit 5 of the control unit 2 on the signal from the input unit 1 indicating the disconnection or internal damage state on the line from the electrical operation unit or the sensor of the construction equipment. In the abnormality diagnosis device for outputting an abnormal signal to the output unit 3 having a function, the integrator 7 and the low frequency oscillator 8 and the divider 9 for signal processing thereof and a range in a predetermined input state The controller abnormal diagnosis circuit 6, which is composed of a comparison circuit 10 that can be compared with a value, and an abnormal judgment circuit 11 that determines whether it is in a normal state, is installed in the controller 2, and the controller abnormal diagnosis circuit 6 is provided. Abnormal diagnosis device of the controller by the electrical circuit, characterized in that configured to be transmitted to the abnormal diagnostic indicator 13 of the output unit (3) to warn that the abnormal state. 2. The apparatus of claim 1, wherein the abnormality determination circuit (11) comprises a power supply unit, a plurality of comparators, an oscillator, a resistor, and a capacitor. The continuous clock signal from the central processing unit 5 is integrated in the integrator 7, the integrated signal and the signal from the low frequency oscillator are input to the divider 9, and the output signal is subjected to the central processing. In case of normal operation, the device 5 resets the output value to the central processing unit 5 through the comparison circuit, and when the central processing unit 5 operates abnormally, the comparison circuit 10 and the abnormal determination circuit ( 11) The method for diagnosing abnormality by the controller abnormality diagnosing circuit characterized in that it outputs an error occurrence signal to the diagnostic output unit 12 and the abnormality diagnosis indicator 13 by determining that it is an abnormal state.