CN103954467A - Fault detector of excavator - Google Patents

Abstract

The invention discloses a fault detector of an excavator. The fault detector of the excavator comprises a detection wiring harness, an electric device drive module, a meter control panel and a power line. The electric device drive module is used for driving to-be-detected electric devices in an air conditioner system, an electronic throttle control system and a flameout system for simulated working state demonstration. The meter control panel comprises an electric device working state demonstration control button, an electric device working state indicator lamp and a display module, wherein the electric device working state demonstration control button is used for controlling the electric device drive module to achieve simulation demonstration of the working state of the to-be-detected electric devices; the electric device working state indicator lamp is used for displaying the working state of the to-be-detected electric devices; the display module is used for displaying related data information and/or related data information change situations of the to-be-detected electric devices in the air conditioner system, the electronic throttle control system and the flameout system under the simulated working state. The fault detector of the excavator can rapidly and accurately detect electric devices which cannot be easily detected or are large in detection difficulty in the maintenance process of the excavator and remove faults, and operation is visual, easy and convenient.

Description

An Excavator Fault Detector

technical field

The invention relates to an excavator fault detector, which is suitable for rapid detection and elimination of electrical systems such as an electronic throttle control system, an air-conditioning system, and a flameout system of the excavator.

Background technique

In the field of excavator fault detection technology, common fault detectors include Hitachi excavator computer fault detector, Carter detector-ET, imported Kobelco-8 detector and so on.

Hitachi excavator computer failure detector, also known as computer small doctor, is suitable for various models of Hitachi excavators, and can detect the pressure of the hydraulic pump of the excavator, the speed of the engine, and the quality of various sensors. The Hitachi excavator instrument displays only a few limited data for the operator, such as: water temperature, water level, fuel level, engine oil level, engine oil pressure, air filter, etc. In the process of repairing, it is impossible to have a detailed understanding of the technical status of the vehicle only by relying on the above-mentioned data. During the repair process, the Hitachi excavator computer fault detector only provides more display information for the operator.

Carter Tester-ET is used in data analysis, fault codes, throttle motor calibration, timing calibration, hydraulic flow matching, time adjustment, computer version repair, computer board configuration modification and EFI engine maintenance. The diagnostic function includes broken cylinder test , Surpass test and swing test, which are applicable to the detection of all engines of Carter series.

Originally imported Kobelco-8 tester, supports Volvo's full range of vehicles and construction machinery equipment, equipped with multi-language software, needs a notebook with a serial port, supported models include Hitachi ZX, Komatsu-6, Komatsu-7, Sumitomo, Daewoo (24C04), Shengang-6, support excavator computer board program matching and throttle program repair.

As mentioned above, the existing excavator fault detectors all communicate with the excavator's engine OEM or excavator ECU to read the fault code, so as to determine which electrical system of the excavator has a problem, and it is aimed at the excavator. controller. This type of fault detector cannot detect the executive electrical components or small control modules of the excavator well.

The excavator's executive electrical devices and small control modules include throttle motor, throttle knob, flameout motor, flameout solenoid valve, air conditioner control panel, air conditioner amplifier, air conditioner anti-frost sensor and fuel level sensor. It is difficult or impossible to detect the above-mentioned executive electrical devices or small control modules using conventional methods. Listed below are the traditional detection methods for each executive electrical device and small control module, and the deficiencies encountered during the detection process.

1. Throttle motor detection

As shown in Figure 1, the throttle motor is divided into two parts, namely the stepping motor part and the position feedback device part. The traditional detection method needs to separate and detect the two parts independently.

There are two ways to detect the state of the stepper motor: one is to measure the resistance between the R terminal and the B terminal of the stepper motor. Since the motor has a large resistance range under normal conditions, accurate measurement cannot be achieved. When the motor When the coil is short-circuited and damaged, the resistance value may also appear within the normal range, and the detection effect is not ideal. Another method is to directly supply power to the two terminals of the motor. The rotation of the motor indicates that it is normal. However, since the two terminals of the motor are located inside a connector, when powering the two terminals of the motor, the The negative wire is connected to the terminal plug in the narrow space of the connector, which is very easy to cause the danger of short circuit of the positive and negative poles.

The detection of the position feedback device requires the maintenance personnel to be very familiar with the three detection terminals, analyze and measure with a multimeter according to the line number, record the measurement results and calculate whether the technical state is good, that is, VW+VY=WY(WY is a fixed value), however, this detection method requires higher skills for maintenance personnel.

2. Throttle knob detection

As shown in Figure 2, the detection method of the throttle knob is the same as the detection method of the position feedback device of the throttle motor, and the maintenance personnel are also required to be very familiar with the three detection terminals of the throttle knob, which requires high skills for maintenance personnel.

3. Flame-off motor detection

As shown in Figure 3, the flame-out motor includes a motor part and a position plate part. There are five wires in the flame-out motor, and the internal structure is also relatively complicated. The internal logic relationship is different in different positions. Using traditional detection methods, the multimeter measurement method is almost impossible to measure. Only if you are very familiar with the internal structure of the flame-out motor and understand its It is only possible to measure the logical relationship between the five wires in different positions, which is impossible for market maintenance personnel who have not been engaged in research and development work.

4. Detection of flameout solenoid valve

As shown in Figure 4, there are two existing detection methods for the flameout solenoid valve: one is to measure the resistance value, the resistance between the R terminal and the B terminal is 24.1Ω; the resistance between the W terminal and the B terminal is 0.33Ω. When measuring with a multimeter, since the multimeter itself has an internal resistance of about 0.3, there is a deviation in the measurement of the resistance value. In addition, the tester needs to memorize the standard data and the signal line to be tested. The other is the direct wiring method, the R terminal is the positive pole, and the B terminal is the negative pole connected to the 12V power supply, touch W to the positive power supply, and the steel needle retracts to indicate that the flame-off solenoid valve is in good condition. This detection method requires the skills of maintenance personnel. The level is relatively high, and once there is a wiring error, the flameout solenoid valve is easy to burn out.

5. Inspection of air conditioning control panel

For the detection of excavator air-conditioning control panels, some air-conditioning control panels cannot be actually tested. Although the other part of the air conditioner control panel can be detected by a multimeter, it is necessary to know the corresponding detection wire harness and turn the temperature adjustment knob during the detection process, which is difficult to complete alone.

6. Air conditioning amplifier detection

For air-conditioning amplifiers, effective detection cannot be carried out in actual maintenance.

7. Air conditioner anti-frost sensor detection

Find the two wires corresponding to the anti-frost sensor of the air conditioner in the wiring harness, and use a multimeter to detect. When the temperature of the anti-frost sensor of the air conditioner increases, the data displayed by the multimeter gradually decreases; when the temperature of the anti-frost sensor of the air conditioner When it decreases, the data displayed by the detector increases gradually. Traditional inspection methods require inspectors to be familiar with the wiring harness and find the two terminals to be measured from the wiring harness.

8. Fuel level sensor detection

The traditional detection method is to take the fuel level sensor out of the fuel tank, use a multimeter to measure the two signal lines of the connector terminal of the fuel level sensor, and move the fuel float slowly from the low end to the top, and the multimeter shows that the data will gradually change from 83Ω to the top. Reduced to 3Ω, this detection method requires the detection personnel to use the multimeter proficiently, and it is difficult for a detection personnel to operate independently.

In addition to the traditional maintenance methods mentioned above, some maintenance personnel will also use the electrical component replacement method, that is, select new electrical components to replace suspected faulty electrical components. Electrical components were also burned, causing huge losses.

Contents of the invention

Aiming at the above-mentioned technical problems existing in the prior art, the present invention proposes an excavator fault detector, which can quickly and accurately detect and eliminate electrical systems such as electronic throttle control system, air-conditioning system and flameout system, and is intuitive and simple to operate , which reduces the skill requirements for maintenance personnel in the fault detection process.

In order to achieve the above object, the present invention adopts the following technical solutions:

An excavator fault detector, comprising:

The detection wire harness is used to connect the electrical components to be detected in the air conditioning system, electronic throttle control system and flameout system. At the end of each detection wire harness, there is a connector that matches the plug connector of the electrical device to be detected;

The electric device driving module is used to drive the electric device to be detected in the air conditioning system, the electronic throttle control system and the flameout system to perform a simulated working state demonstration, and judge whether the electric device is good or bad according to the working state demonstration of the electric device to be detected;

The instrument control panel, including the control button for the demonstration of the working state of the electrical device, the indicator light of the working status of the electrical device and the display module;

The working state demonstration control button of the electrical device is used to control the driving module of the electrical device to realize the simulation demonstration of the working state of the electrical device to be detected;

The working status indicator light of the electrical device is used to display the working status of the electrical device to be detected, and judge whether the electrical device is good or bad according to the light on or off of the working status indicator of the electrical device;

The display module is used to display the relevant data information and/or the change of the relevant data information of the electrical components to be detected in the air conditioning system, the electronic throttle control system and the flameout system in the simulated working state, and at the same time display the situation and/or the waiting time according to the above data information. Demonstration of the working status of the electrical device to judge whether the electrical device under test is good or bad;

And the power cord, used to connect the power supply.

Further, the electrical components to be detected include an air conditioner amplifier, an air conditioner control panel, an air conditioner anti-frost sensor, a fuel level sensor, a throttle motor, a throttle knob, a flameout motor, and a flameout solenoid valve; switch button.

Further, the above-mentioned electric device drive module includes an air-conditioning system drive module, an electronic throttle control system drive module, and a flameout system drive module.

Further, the control buttons for demonstrating the working state of the electrical components include the switch button of the air conditioner amplifier, the forward rotation and reverse rotation buttons of the throttle motor, the expansion and contraction buttons of the flameout motor, and the closing and opening buttons of the flameout solenoid valve.

Further, the above-mentioned working state indicator light of the electric device is an air conditioner amplifier indicator light.

Further, a fuse box is provided at the end of the above-mentioned power cord, and when the positive and negative poles of the power cord are connected reversely, the fuse box will be blown.

The advantages of the present invention are:

The invention can quickly and accurately detect and eliminate the executive electrical devices and small control modules that are difficult to detect or difficult to detect during excavator maintenance, and the operation is intuitive and simple, reducing the skill requirements for maintenance personnel in the fault detection process. It can also effectively prevent some electrical components with good performance from returning to the factory.

Description of drawings

Figure 1 is a schematic diagram of the internal structure of the accelerator motor;

Figure 2 is a schematic diagram of the internal structure of the throttle knob;

Fig. 3 is a schematic diagram of the internal structure of the flame-out motor;

Figure 4 is a schematic diagram of the internal structure of the flameout solenoid valve;

Fig. 5 is a structural schematic diagram of the excavator fault detector in the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

An excavator fault detector, comprising:

The detection wire harness is used to connect the electrical components to be detected in the air conditioning system, electronic throttle control system and flameout system. At the end of each detection wire harness, there is a connector that matches the plug connector of the electrical device to be detected;

The electric device driving module is used to drive the electric device to be detected in the air conditioning system, the electronic throttle control system and the flameout system to perform a simulated working state demonstration, and judge whether the electric device is good or bad according to the working state demonstration of the electric device to be detected;

The instrument control panel, including the control button for the demonstration of the working state of the electrical device, the indicator light of the working status of the electrical device and the display module;

The working state demonstration control button of the electrical device is used to control the driving module of the electrical device to realize the simulation demonstration of the working state of the electrical device to be detected;

The working status indicator light of the electrical device is used to display the working status of the electrical device to be detected, and judge whether the electrical device is good or bad according to the light on or off of the working status indicator of the electrical device;

The display module is used to display the relevant data information and/or the change of the relevant data information of the electrical components to be detected in the air conditioning system, the electronic throttle control system and the flameout system in the simulated working state, and at the same time display the situation and/or the waiting time according to the above data information. Demonstration of the working status of the electrical device to judge whether the electrical device under test is good or bad;

And the power cord, used to connect the power supply.

As shown in FIG. 5 , specifically, the electrical components to be detected include an air conditioner amplifier, an air conditioner control panel, an air conditioner anti-frost sensor, a fuel level sensor, a throttle motor, a throttle knob, a flameout motor, and a flameout solenoid valve. There is also a master switch button on the meter control panel, which is used to control the working conditions of the meter control panel. When the meter master switch button is turned on, the meter control panel is in the working state. When the meter master switch button is turned off, the meter control panel does not work. .

The electrical device drive module includes an air-conditioning system drive module, an electronic throttle control system drive module and a flameout system drive module. Each drive module is used to drive the air-conditioning system, the electronic throttle control system, and the electrical components to be tested in the flameout system to demonstrate the simulated working status.

The working state demonstration control buttons of the electric parts include the switch button of the air conditioner amplifier, the forward rotation and reverse rotation buttons of the throttle motor, the expansion and contraction buttons of the flameout motor, and the closing and opening buttons of the flameout solenoid valve.

The working status indicator light of the electric device is the indicator light of the air conditioner amplifier.

In addition, there is a fuse box at the end of the power cord. When the positive and negative poles of the power cord are reversed, the fuse box will be blown to protect the fault detector of the excavator.

The following is a further detailed description of the detection process of the electrical device to be detected:

1 Air conditioning amplifier detection

Connect the plug connector of the air-conditioning amplifier with the corresponding connector on the excavator fault detector, turn on the main switch button of the instrument, and at the same time turn on the switch button of the air-conditioning amplifier, the indicator light of the air-conditioning amplifier is on, and then turn off the switch button of the air-conditioning amplifier. If the indicator light of the air conditioner amplifier goes out, it means that the performance status of the air conditioner amplifier is good. Compared with the traditional detection method, the detection process of the air conditioner amplifier in the present invention is intuitive and simple.

2 Air conditioner control panel detection

There are different detection methods for different types of air conditioner control panels:

One detection method is to connect the plug joint of the air conditioner control panel to the corresponding connector on the excavator fault detector, turn on the main switch button of the instrument, turn the temperature adjustment knob on the air conditioner control panel, and the display module will display continuous changes. , which indicates that the performance status of the air conditioning control panel is good.

Another detection method is to connect the plug joint of the air conditioner control panel to the corresponding connector on the excavator fault detector, turn on the main switch button of the instrument, and at the same time turn on the switch button of the air conditioner amplifier, and then turn on the wind speed knob on the air conditioner control panel To any gear of low, medium and high, turn the temperature adjustment knob on the air conditioner control panel clockwise, the indicator light of the air conditioner amplifier is on, turn the temperature adjustment knob on the air conditioner control panel counterclockwise, the indicator light of the air conditioner amplifier is off, that is, Indicates that the performance status of the air conditioning control panel is good.

Compared with the traditional detection method, the detection process of the air conditioner control panel in the present invention is intuitive and simple, and the operation difficulty is low.

3 Air conditioner anti-frost sensor detection

Connect the plug connector of the anti-frost sensor of the air conditioner to the corresponding connector on the fault detector of the excavator, and turn on the main switch button of the instrument. When the temperature of the anti-frost sensor of the air conditioner rises, the data information displayed on the display module is gradually Decrease, when the temperature of the anti-frost sensor of the air conditioner decreases, the data information displayed on the display module gradually increases, which means that the performance of the anti-frost sensor of the air conditioner is in good condition. Compared with the traditional detection method, although the detection effect is the same, for the detection of the air conditioner anti-frost sensor, the maintenance personnel do not need to have a good understanding of the wire harness of the air conditioner anti-frost sensor, which reduces the skill requirements of the maintenance personnel in the fault detection process .

4 fuel level sensor detection

Take out the fuel level sensor from the fuel tank, connect the plug connector of the fuel level sensor with the corresponding connector on the fault detector of the excavator, turn on the main switch button of the instrument, and move the fuel float slowly from the low end to the top, The data information displayed on the display module will gradually decrease from high, which means that the performance of the fuel level sensor is in good condition. Compared with the traditional detection method, the present invention reduces the detection difficulty of the fuel level sensor, and significantly reduces the maintenance personnel's proficiency in using the multimeter.

5 throttle motor detection

Connect the plug connector of the throttle motor to the corresponding connector on the excavator fault detector, turn on the main switch button of the instrument, press the forward rotation button of the throttle motor, the cable of the throttle motor will stretch out, press the reverse button of the throttle motor Turn the button, the cable of the accelerator motor will retract, which means that the motor part of the accelerator motor is normal.

At the same time, two pieces of data information of the position feedback signal will be displayed on the display module. When the throttle motor is rotating forward and the throttle motor is rotating reversely, if one piece of data information gradually increases and the other piece of data information gradually decreases, and the two requirements are satisfied. The sum of the data information is basically a fixed value, which indicates that the position feedback signal of the throttle motor is normal.

If the motor part of the throttle motor and the position feedback signal part are normal, it indicates that the performance of the throttle motor is in good condition. Compared with the traditional detection method, the invention detects the throttle motor intuitively and conveniently, and the detection result is more accurate.

6 Throttle knob detection

Connect the plug connector of the throttle knob to the corresponding connector on the fault detector of the excavator, turn on the main switch button of the instrument, and the display module will display two data information of the throttle knob. With the rotation of the throttle knob, if one data If the information gradually increases and the other data information gradually decreases, and the sum of the two data information is basically a fixed value, it indicates that the performance of the throttle knob is in good condition. Compared with the traditional detection method, the detection of the accelerator knob in the present invention is intuitive and simple, and the detection result is more accurate.

7 flameout motor detection

Connect the plug connector of the flame-off motor with the corresponding connector on the excavator fault detector, turn on the main switch button of the instrument, press the extend button of the flame-off motor, the pull wire of the flame-off motor will stretch out, press the retract button of the flame-off motor , the pull wire of the stalled motor will retract, which means that the performance of the stalled motor is in good condition. Compared with the traditional detection method, the detection of the flame-out motor in the present invention is intuitive and simple.

8 flameout solenoid valve detection

Connect the plug connector of the flameout solenoid valve to the corresponding connector on the excavator fault detector, turn on the main switch button of the instrument, press the close button of the flameout solenoid valve, the steel needle of the flameout solenoid valve retracts, press the flameout solenoid valve Press the button of the valve, and the steel needle of the flameout solenoid valve pops out, which means that the performance of the flameout solenoid valve is in good condition. Compared with the traditional detection method, the detection of the flameout electromagnetic valve in the present invention is intuitive and simple.

Excavator fault detector is a very suitable detection tool in excavator maintenance. It can not only quickly implement status inspection on electrical components, but also present the inspection results to maintenance personnel intuitively and easily. It is useful for fault diagnosis and maintenance. Helping, compared with the traditional detection that relies too much on empirical judgment, the present invention can accurately perform fault diagnosis.

Of course, the above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments. It should be noted that all equivalent substitutions made by any person skilled in the art under the teaching of this specification , obvious deformation forms, all fall within the essential scope of this specification, and should be protected by the present invention.

Claims (6)

1. An excavator fault detector, characterized in that it comprises: The detection wire harness is used to connect the electrical components to be detected in the air conditioning system, electronic throttle control system and flameout system. At the end of each detection wire harness, there is a connector that matches the plug connector of the electrical device to be detected; The electric device driving module is used to drive the electric device to be detected in the air conditioning system, the electronic throttle control system and the flameout system to perform a simulated working state demonstration, and judge whether the electric device is good or bad according to the working state demonstration of the electric device to be detected; The instrument control panel, including the control button for the demonstration of the working state of the electrical device, the indicator light of the working status of the electrical device and the display module; The working state demonstration control button of the electrical device is used to control the driving module of the electrical device to realize the simulation demonstration of the working state of the electrical device to be detected; The working status indicator light of the electrical device is used to display the working status of the electrical device to be detected, and judge whether the electrical device is good or bad according to the light on or off of the working status indicator of the electrical device; The display module is used to display the relevant data information and/or the change of the relevant data information of the electrical components to be detected in the air-conditioning system, the electronic throttle control system and the flameout system in the simulated working state. Demonstration of the working status of the electrical device to judge whether the electrical device under test is good or bad; And the power cord, used to connect the power supply. 2. A kind of excavator fault detection instrument according to claim 1, is characterized in that, described to-be-detected electric device comprises air-conditioning amplifier, air-conditioning control panel, air-conditioning anti-frost sensor, fuel level sensor, throttle motor, throttle Knob, flameout motor and flameout solenoid valve; the instrument control panel is also provided with an instrument master switch button. 3 . The excavator fault detector according to claim 2 , wherein the electric device drive module includes an air-conditioning system drive module, an electronic throttle control system drive module and a flameout system drive module. 4 . 4. A kind of excavator fault detection instrument according to claim 2, is characterized in that, described electric device working state demonstration control button comprises air-conditioning amplifier switch button, forward rotation and reverse rotation button of throttle motor, extension and extension of flame-out motor Compression button, and closing and opening buttons of flameout solenoid valve. 5. The excavator fault detector according to claim 2, wherein the working status indicator light of the electric device is an air conditioner amplifier indicator light. 6. The excavator fault detector according to claim 1, wherein a fuse box is provided at the end of the power cord, and the fuse box will blow when the positive and negative poles of the power cord are reversed.