Engineering machinery circuit signal detection device and method thereof

Abstract

The invention provides an engineering machinery circuit signal detection device and a method thereof, and belongs to the technical field of circuit signal detection.According to the device, signal parameters are freely switched within a vehicle-mounted range, simulation numerical values are actively created and transmitted to an engineering machinery equipment controller or an electric appliance, the fault range of sensing alarm faults can be rapidly judged, and the fault detection efficiency is improved. According to the vehicle-mounted detection system, the labor intensity of maintenance personnel and the dependence on a manufacturer service computer are reduced, signal parameters can be freely switched in a vehicle-mounted range, simulation values are actively created and transmitted to an engineering equipment controller or an electric appliance, and finally, difficult faults are efficiently solved by utilizing various types of detection methods.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit signal detection, and in particular, to a circuit signal detection device and method for construction machinery. Background Art

[0002] Signals in electronic circuits are all electrical signals. An electrical signal refers to a voltage or current that changes over time, and information is transmitted, exchanged, stored, retrieved, etc. through electrical signals. The forms of electrical signals are diverse and can be classified from different perspectives. In electronic circuits, signals are divided into analog signals and digital signals.

[0003] Currently, when detecting the circuit signals of construction machinery equipment, it is generally detected by a multimeter. The multimeter can only measure voltage, resistance, and current, and the fault troubleshooting method is single. Since the circuit signals of construction machinery equipment are generated by various proportional pumps, solenoid valves, sensors, and relays, when diagnosing faults through a multimeter, it is not conducive to quickly determining the fault point, especially the electromechanical connection fault, which relatively reduces the detection efficiency and increases the work intensity of maintenance personnel. Therefore, we propose a circuit signal detection device and method for construction machinery to solve the above problems. Summary of the Invention

[0004] The present invention discloses a circuit signal detection device and method for construction machinery to solve any of the above and other potential problems in the prior art.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A circuit signal detection device for construction machinery includes: a CPU central processing unit, a test function selection switch, a transformer, a lithium battery, a voltage adjustment switch, a current adjustment switch, a signal detection device control board, an adjustable power supply control board, a relay test switch, a relay detection socket, a backlight switch, a display screen, a proportional valve test interface, a solenoid valve, a sensor test interface, a lithium battery charging port, a placement container (for fixing the above various accessories), a yellow normally open indicator light, and a red normally closed indicator light.

[0007] The CPU central processing unit is fixed at the exact center inside the placement container, directly connected to the display screen, close to the display screen at the upper middle side of the front of the housing, and close to the inner side of the front panel of the housing; the detection function selection switch is fixed outside the placement container, at the lower left side of the front of the housing; the transformer is fixed at the upper middle side inside the placement container, covering the upper half of the CPU central processing unit when viewed from the back of the detection device; the adjustable power control board is directly connected to the voltage / current regulation switch and is close to the voltage / current regulation switch at the outer top of the placement container; the lithium battery is fixed at the inner bottom of the placement container; the voltage regulation switch is fixed at the outer top of the placement container, biased to the left; the current regulation switch is fixed at the outer top of the placement container, biased to the right; the signal detection device control board is fixed at the exact center inside the placement container, covering the lower half of the CPU central processing unit when viewed from the back of the detection device; the relay test switch is fixed outside the placement container, at the middle left side of the front of the housing; the display screen is fixed outside the placement container, at the upper middle side of the front of the housing; the test interface is fixed outside the placement container, at the lower middle part of the right side of the housing; the external switches and jacks are designed considering the installation position of the internal circuit board, as well as factors such as waterproofing and convenient operation.

[0008] As a preferred embodiment of the engineering machinery signal detection device described in the present invention, the detection device control board is connected to components such as the adjustable power control board and the test function selection switch, and provides a 0 - 5 - 24V voltage output to the solenoid valve and the sensor test interface.

[0009] As a preferred embodiment of the engineering machinery signal detection device described in the present invention, the detection device control board conveys the acquired detection parameters to the CPU central processing unit. After performing a function operation on the parameters obtained from the detection device control board, the CPU central processing unit transfers the parameters to the display screen to display the detection data.

[0010] As a preferred embodiment of the engineering machinery signal detection device described in the present invention, the CPU central processing unit provides an effective current of 0 - 0.82A to the proportional valve test interface to adjust the proportional pump to achieve changes in the proportional fan speed and the need for speed measurement, and at the same time, the current value is displayed in real time on the display screen.

[0011] As a preferred embodiment of the engineering machinery signal detection device described in the present invention, after inserting a relay into the relay detection socket, the relay test switch is turned to the power-on end. When a normally open relay is detected normally, the yellow normally open indicator light lights up. When a normally closed relay is detected normally, the red normally open indicator light lights up.

[0012] An engineering machinery circuit signal detection method includes the following steps:

[0013] S1. When detecting the proportional valve: unplug the in-vehicle proportional valve plug. First, use the proportional valve test interface on the detection device to connect to the plug on the in-vehicle valve block body (not the circuit), and then start the device. Turn on the power switch of the detection device, turn the test function selection switch to the current measurement gear, and turn the current adjustment switch. When adjusted to 0 - 0.2A, the various types of fans controlled by the proportional valve are at the highest speed at this time; when in the range of 0.2 - 0.5A, the speed is in an adjustable state; when at 0.5 - 0.82A, it is at the lowest speed. This verifies the integrity of the mechanical / oil circuit.

[0014] S2. When detecting the solenoid valve: unplug the in-vehicle solenoid valve plug. First, use the red and black wire clips in the solenoid valve and sensor test interface on the detection device to connect to the positive and negative pins on the in-vehicle valve block body (not the circuit) respectively, and then turn on the vehicle ignition to the first gear for power on. Turn on the power switch of the detection device, turn the test function selection switch to the voltage / resistance measurement gear, and turn the voltage adjustment switch. When the voltage is adjusted from 0V to 14.5V and above (14.5 - 20.62V), the solenoid valve starts to work, enabling the oil / gas circuit to pass through the valve block or making corresponding mechanical actions. This verifies the integrity of the solenoid valve oil / gas circuit.

[0015] S3. When detecting the sensor: unplug the common in-vehicle three-pin sensor plug. First, use the red, yellow, and black wire clips in the solenoid valve and sensor test interface on the detection device to connect to the positive, signal, and negative pins on the sensor connection circuit (not the sensor) respectively, and then turn on the ignition to the first gear for power on, and check for new fault codes on the in-vehicle screen. Turn on the power switch of the detection device, turn the test function selection switch 2 to the voltage / resistance measurement gear, and turn the voltage adjustment switch. When the voltage is adjusted to any value within the effective transmission voltage range of 0.5 - 4.5V of the in-vehicle sensor, if the fault code on the in-vehicle screen can be automatically cleared, it can be determined that the sensor is normal.

[0016] S4. When detecting the relay: insert the relay to be tested into the relay test socket 11, turn on the power switch of the detection device, and toggle the relay test switch up and down. When detecting a normal relay, the normally open and normally closed contacts will act respectively, and the corresponding yellow normally open indicator light and red normally closed indicator light will also light up and remain on respectively.

[0017] 1. In the past, for the "three highs" problem, electricians always debated endlessly about whether there was a problem with the spiral coil of the proportional pump, the control circuit, or the hydraulic pump and the medium circulation. Now, by observing the corresponding speed of the fan through the simulated current value, if the speed is normal, it can be judged as a circuit fault.

[0018] 2. In the past, for the solenoid valve, the method of "finding a connection to power" for detection has become the past. Now, by connecting the tester, it can be immediately known whether the valve is normally open and closed. If there is an abnormal open and closed state, it means there is a fault with the valve.

[0019] 3. In the past, for "replacement", when there was a sensor failure, it was usually necessary to "remove and test one by one, touch and replace one by one". Now, by flexibly adjusting the feedback signal or the voltage to the ground, it is possible to confirm whether the vehicle alarm has been eliminated. If it can be eliminated, it means that the sensor is faulty.

[0020] 4. In the past, for "difficult to measure", when using a multimeter to measure a relay, the resistance values often did not differ much, but the actual functions were different. Now, by inserting the relay into the test socket and toggling the on-off switch up and down, and observing whether the normally open and normally closed indicator lights light up correspondingly and the sound of the relay's suction, it is possible to accurately and quickly determine the condition of the relay.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: By freely switching signal parameters within the vehicle range and actively creating analog values to be transmitted to the device controller, it is possible to efficiently solve the types of construction machinery circuit faults that were difficult to judge in the past, improve the efficiency of construction machinery circuit signal detection, effectively reduce the labor intensity of maintenance personnel, break the technical monopoly of manufacturers, and further improve work efficiency; its size is comparable to that of a multimeter, which is convenient for maintenance personnel to use outdoors and improves the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention.

[0023] Figure 2 is a schematic external view of the present invention.

[0024] In the figure: 1 - CPU central processing unit, 2 - test function selection switch, 3 - transformer, 4 - 24V lithium battery, 5 - voltage adjustment switch, 6 - current adjustment switch, 7 - vehicle detector control board, 8 - adjustable power supply control board, 9 - power switch, 10 - relay test switch, 11 - relay detection socket, 12 - backlight switch, 13 - display screen, 14 - proportional valve test interface, 15 - solenoid valve and sensor test interface, 16 - lithium battery charging port, 17 - yellow normally open indicator light, 18 - red normally closed indicator light. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] As Figure 1 shown, a construction machinery circuit signal detection device of the present invention includes: CPU central processing unit, test function selection switch, transformer, lithium battery, voltage adjustment switch, current adjustment switch, signal detection device control board, adjustable power supply control board, relay test switch, relay detection socket, backlight switch, display screen, proportional valve test interface, solenoid valve and sensor test interface, lithium battery charging port, placement container (used to fix the above various accessories), yellow normally open indicator light, red normally closed indicator light.

[0027] The CPU central processing unit is fixed in the exact center inside the placement container, directly connected to the display screen, close to the display screen on the upper middle side of the front of the housing, and close to the inner side of the front panel of the housing; the detection function selection switch is fixed outside the placement container, on the lower left side of the front of the housing; the transformer is fixed on the upper middle side inside the placement container, covering the upper half of the CPU central processing unit when viewed from the back of the detection device; the adjustable power control board is directly connected to the voltage / current adjustment switch and is close to the voltage / current adjustment switch on the outer top of the placement container; the lithium battery is fixed at the bottom inside the placement container; the voltage adjustment switch is fixed on the outer top of the placement container, biased to the left; the current adjustment switch is fixed on the outer top of the placement container, biased to the right; the signal detection device control board is fixed in the exact center inside the placement container, covering the lower half of the CPU central processing unit when viewed from the back of the detection device; the relay test switch is fixed outside the placement container, on the middle left side of the front of the housing; the display screen is fixed outside the placement container, on the upper middle side of the front of the housing; the test interface is fixed outside the placement container, on the middle and lower part of the right side of the housing; the external switches and jacks are designed considering the installation positions of the internal circuit boards, as well as factors such as waterproofing and convenient operation.

[0028] As a preferred solution of a construction machinery signal detection device according to the present invention, the detection device control board is connected to components such as the adjustable power control board and the test function selection switch, and provides a 0-5-24V voltage output to the solenoid valve and the test interface.

[0029]

[0030] As a preferred solution of a construction machinery signal detection device according to the present invention, the detection device control board conveys the obtained detection parameters to the CPU central processing unit, and after the CPU central processing unit performs a power operation on the parameters obtained from the detection device control board, it is transmitted to the display screen to display the detection data.

[0031] As a preferred solution of a construction machinery signal detection device according to the present invention, the CPU central processing unit provides an effective current of 0-0.82A to the proportional valve test interface to adjust the proportional pump to achieve changes in the proportional fan speed and the requirement for measuring the speed, and at the same time, the current value is displayed in real time on the display screen.

[0032] As a preferred solution of a construction machinery signal detection device according to the present invention, after the relay test switch inserts a relay into the relay detection socket, it is turned to the power-on end. If the normally open type relay is detected normally, the yellow normally open indicator light will light up. If the normally closed type relay is detected normally, the red normally open indicator light will light up.

[0033] A method for detecting construction machinery circuit signals includes the following steps:

[0034] ​S1. When detecting the proportional valve: unplug the in-vehicle proportional valve plug. First, use the proportional valve test interface on the detection device to connect to the plug on the in-vehicle valve block body (not the circuit), and then start the device. Turn on the power switch of the detection device, move the test function selection switch to the current measurement gear, and turn the current adjustment switch. When the current is adjusted to 0 - 0.2 A, the various types of fans controlled by the proportional valve are at the highest speed at this time; when it is in the range of 0.2 - 0.5 A, the speed is in an adjustable state; when it is 0.5 - 0.82 A, it is at the lowest speed. This verifies the integrity of the mechanical / oil circuit.

[0035] S2. When detecting the solenoid valve: unplug the in-vehicle solenoid valve plug. First, use the red and black wire clips in the solenoid valve and sensor test interface on the detection device to connect to the positive and negative pins on the in-vehicle valve block body (not the circuit) respectively, and then turn on the vehicle key to the first gear for power on. Turn on the power switch of the detection device, move the test function selection switch to the voltage / resistance measurement gear, and turn the voltage adjustment switch. When the voltage is adjusted from 0 V to 14.5 V and above (14.5 - 20.62 V), the solenoid valve starts to work, enabling the oil / gas circuit to pass through the valve block or making corresponding mechanical actions. This verifies the integrity of the oil / gas circuit of the solenoid valve.

[0036] S3. When detecting the sensor: unplug the common in-vehicle three-pin sensor plug. First, use the red, yellow, and black wire clips in the solenoid valve and sensor test interface on the detection device to connect to the positive, signal, and negative pins on the sensor connection circuit (not the sensor) respectively, and then turn on the key to the first gear for power on, and check the new fault codes on the in-vehicle screen. Turn on the power switch of the detection device, move the test function selection switch 2 to the voltage / resistance measurement gear, and turn the voltage adjustment switch. When the voltage is adjusted to any value within the effective transmission voltage range of 0.5 - 4.5 V of the in-vehicle sensor, if the fault code on the in-vehicle screen can be automatically cleared, it can be determined that the sensor is normal.

[0037] S4. When detecting the relay: insert the relay to be tested into the relay test socket 11, turn on the power switch of the detection device, and toggle the relay test switch up and down. During the normal detection of the relay, the normally open and normally closed contacts will act respectively, and the corresponding yellow normally open indicator light and red normally closed indicator light will also light up and remain on respectively.

[0038] Example:

[0039] 1. Proportional valve detection method: Unplug the in-vehicle proportional valve plug. First, connect the proportional valve test interface 14 of the tester to the plug on the in-vehicle valve block body (not the circuit), and then start the device; turn on the power switch 9 of the tester, move the test function selection switch 2 to the current measurement gear, turn the current adjustment switch 6, when adjusted to 0 - 0.2A, the various types of fans controlled by the proportional valve are at the highest speed at this time, when in the range of 0.2 - 0.5A, the speed is in an adjustable state, and when at 0.5 - 0.82A, it is at the lowest speed. This verifies the integrity of the mechanical / oil circuit, that is, it can be judged that there is a fault in the control circuit aspect;

[0040] 2. Solenoid valve detection method: Unplug the in-vehicle solenoid valve plug. First, use the red and black wire clips in the solenoid valve and sensor test interface 15 of the tester to connect to the positive and negative pins on the in-vehicle valve block body (not the circuit) respectively, and then turn on the vehicle key to the first gear for power on; turn on the power switch 9 of the tester, move the test function selection switch 2 to the voltage / resistance measurement gear, turn the voltage adjustment switch 5, when the voltage is adjusted from 0V to 14.5V and above (14.5 - 20.62V), the solenoid valve starts to work, enabling the oil / gas circuit to pass through the valve block or making corresponding mechanical actions. This verifies the integrity of the solenoid valve oil / gas circuit, that is, it can be judged that there is a fault in the control circuit aspect;

[0041] 3. Sensor detection method: Unplug the common in-vehicle three-pin sensor plug. First, use the red, yellow, and black wire clips in the solenoid valve and sensor test interface 15 of the tester to connect to the positive, signal, and negative pins on the sensor connection circuit (not the sensor) respectively, and then turn on the key to the first gear for power on, and check the new fault codes on the in-vehicle screen; turn on the power switch 9 of the tester, move the test function selection switch 2 to the voltage / resistance measurement gear, turn the voltage adjustment switch 5, when the voltage is adjusted from 0V to 5V and above (5 - 20.62V), if the fault codes on the in-vehicle screen can be automatically cleared, it can be judged that the section from the circuit - controller - display screen is normal and the sensor has a fault;

[0042] 4. Relay detection method: Insert the relay to be tested into the relay test socket 11, turn on the power switch 9 of the tester, and toggle the relay test switch 10 up and down. During the normal detection of the relay, the normally open and normally closed contacts will act respectively, and the corresponding yellow normally open indicator light 17 and red normally closed indicator light 18 will also light up and remain on respectively.

[0043] The above has introduced in detail a construction machinery circuit signal detection device and its method provided by the embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

[0044] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but rather use the difference in the functions of components as the criterion for distinction. As used throughout the specification and claims, the terms "comprising" and "including" are open-ended terms and should be interpreted as "comprising / including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve the technical problems within a certain error range and basically achieve the technical effects. The subsequent description in the specification is the preferred embodiment for implementing the present application, but the description is for the purpose of explaining the general principles of the present application and is not intended to limit the scope of the present application. The protection scope of the present application shall be subject to that defined by the appended claims.

[0045] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such commodity or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0046] It should be understood that the term "and / or" used herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: the sole existence of A, the simultaneous existence of A and B, and the sole existence of B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0047] The above description shows and describes several preferred embodiments of the present application. However, as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the application concept described herein through the above teachings or the technology or knowledge in the relevant field. And the changes and variations made by those skilled in the art without departing from the spirit and scope of the present application should fall within the protection scope of the appended claims of the present application.

Claims

1. An engineering machinery circuit signal detection device, characterized in that, the engineering machinery circuit signal detection device includes: a central processing unit, a test function selection switch, a transformer, a lithium battery, a voltage adjustment switch, a current adjustment switch, a signal detection device control board, an adjustable power supply control board, a relay test switch, a relay detection socket, a display screen, a test interface and a placement container; wherein, the CPU central processing unit is fixed in the center inside the placement container, is directly connected to the display screen, is close to the display screen on the upper middle side of the front of the housing, and is close to the inner side of the front panel of the housing; it is used for the conversion of detection functions, the reception function of detection results, and transmits the processed detection results to the display screen; the detection function selection switch is fixed outside the placement container, at the lower left side of the front of the housing; it is a two-position switch, one position is the proportional valve test position, and one position is the solenoid valve and sensor test position; the function of the transformer is to convert the 24V lithium battery to 3.3V and then supply power to the CPU central processing unit 1, and it is fixed in the placement container.

2. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the lithium battery has a voltage of 24V, a capacity of 3000mAh, and a maximum current of 5A, and is fixed in the placement container.

3. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the voltage adjustment switch is a resistive switch, and the controllable effective output voltage is 0-21V, and it is fixed on the top of the placement container.

4. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the current adjustment switch is a resistive switch, and the controllable effective current range is 0.2-0.82A, and it is fixed on the top of the placement container.

5. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the signal detection device control board 7 is used to receive the selection of test functions, the signals of the adjustable power supply control board 8 and the detection of the relay, and is fixed in the placement container.

6. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the adjustable power supply control board is used for parameter adjustment of the voltage and current adjustment switches, and is fixed in the placement container.

7. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the power switch is used to turn on the internal power supply to make the instrument work normally and the display screen light up, and is fixed on the placement container; the relay detection switch is a two-position switch, one position is the power-on test position, and one position is the power-off test position, and there are normal indication lights for normally open contacts and normally closed contacts beside it, and it is fixed on the placement container; the relay detection socket is a 12 / 24V, general-purpose five-pin relay detection socket, and is fixed on the side of the placement container; the backlight switch is a push-button switch, short pressing keeps the display screen data, and long pressing lights up the display screen backlight, and is fixed on the side of the placement container.

8. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the proportional valve test interface is a round plug, with two pins, positive and negative two wires, and is used to connect to the external two-pin proportional valve test wire harness, and is movable and detachable, and is fixed on the side of the placement container.

9. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the solenoid valve and the sensor test interface are round plug connectors, three-pin, with positive, negative, and signal three wires, used for docking with the external three-pin solenoid valve and sensor test wire harness, and are movable and detachable, and are fixed on the side of the placement container.

10. The engineering machinery circuit signal detection device according to claim 1, characterized in that, the lithium battery charging port is used to recharge the lithium battery, with an input of AC100 - 240V, 50 / 60Hz, and an output of DC25.2V, 1A, and is fixed on the side of the placement container.

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