An outrigger circuit fault self-diagnosis device and method for an aerial work vehicle

Abstract

A self-diagnosis device for the outrigger circuit of an aerial work platform, comprising a controller, a detection resistor board and a position detection travel switch; the detection resistor board consists of detection resistor A and detection resistor B, and the resistance values of detection resistor A and detection resistor B are different; the position detection travel switch includes a normally open switch and a normally closed switch; the detection resistor A and the detection resistor B are respectively connected in series with the normally open switch and the normally closed switch; the position detection travel switch is connected to the input end of the controller, and the controller infers the fault types of the circuit and the detection switch based on the different detected resistance values.

Description

Technical Field

[0001] The present invention relates to the technical field of outrigger fault diagnosis for aerial work platforms, and specifically to a self-diagnosis device for outrigger circuit faults of an aerial work platform. Background Art

[0002] As a typical aerial manned operation device, the safety and stability of the operation of an aerial work platform are the most basic requirements. Among them, the compaction detection of the four vertical outriggers is the most important indicator for detecting the stability of the whole vehicle. The vertical outrigger compaction detection travel switch is installed on the upper part of the valve lock of the vertical outrigger cylinder. Its detection wire harness is laid along the hydraulic oil circuit inside the horizontal outrigger and needs to be stretched as the horizontal cylinder expands and contracts. Because the internal space of the horizontal outrigger is relatively narrow, the wire harness often fails due to extrusion or wear. The traditional fault determination method is that the maintenance personnel on-site disassemble the outrigger seal plate, disconnect the connected connectors, and use a multimeter to detect the continuity between each wire core and the structural member, and between each wire core. The process is cumbersome and time-consuming. And if the fault does not reappear during the detection, it is very difficult to locate the fault point in one detection.

[0003] Chinese Patent CN10103529346B discloses a circuit fault diagnosis method and device. This solution forms a voltage division circuit by adding a group of resistor networks together with the detection switch to reflect the state of the wire. The controller determines the fault type of the wire by detecting the voltage value of the input point. This solution has the following problems: To implement this function, it is necessary to output the voltage value of the resistor network. When the external circuit is short-circuited to the ground, a large current will be formed instantaneously in the loop, which may cause the controller input port or the detection switch to burn out, with a relatively high risk. In addition, this device can only detect the fault state of the wire and cannot detect the fault state of the detection switch. The fault detection is not comprehensive enough, and when the detection switch fails, it will cause inaccurate detection results. Summary of the Invention

[0004] In order to overcome the defects existing in the above-mentioned prior art, the present invention provides a self-diagnosis device and method for outrigger circuit faults of an aerial work platform, which can diagnose the outrigger circuit faults and detection switch faults of an aerial work platform at a very low cost.

[0005] The technical solution adopted by the present invention: A self-diagnosis device for outrigger circuit faults of an aerial work platform includes a controller, a detection resistor board, and a position detection travel switch; the detection resistor board is composed of a detection resistor A and a detection resistor B, and the resistance values of the detection resistor A and the detection resistor B are different; the position detection travel switch includes a normally open switch and a normally closed switch; the detection resistor A and the detection resistor B are respectively connected in series with the normally open switch and the normally closed switch; the position detection travel switch is connected to the input end of the controller.

[0006] Preferably, the position detection travel switch is connected to the input end of the controller through a detection wire.

[0007] A method for self-diagnosing leg circuit faults of an aerial work vehicle includes the following steps:

[0008] S1: Install the position detection travel switch on the vertical leg of the aerial work vehicle, connect it to the input end of the controller through a detection wire, and the controller detects the branch resistance;

[0009] S2: The controller determines the fault type according to the detected branch resistance and divides it into the following situations:

[0010] Result 1: In the case of no fault, when the vertical leg is not compacted in place, the normally open switch is in the open state, the normally closed switch is in the closed state, and the resistance value detected by the controller is the resistance value of the detection resistor B;

[0011] Result 2: In the case of no fault, when the vertical leg is compacted in place, the normally open switch is in the closed state, the normally closed switch is in the open state, and the resistance value detected by the controller is the resistance value of the detection resistor A;

[0012] Result 3: When a fault occurs where two sets of contacts of the detection travel switch conduct simultaneously, the resistance value detected by the controller is the parallel resistance value of the detection resistor A and the detection resistor B;

[0013] Result 4: When a fault occurs where two sets of contacts of the detection travel switch disconnect simultaneously, the resistance value detected by the controller is infinite.

[0014] Preferably, the following situations are also included in step S2:

[0015] Result 5: When the detection wire is short-circuited, the resistance value detected by the controller is 0 ohm;

[0016] Result 6: When the detection wire is open-circuited, the resistance value detected by the controller is infinite.

[0017] The beneficial effects of the present invention: With extremely low cost, the present invention can diagnose the working state and working type of the detection switch and the circuit by collecting the resistance value through the analog input port of the controller, and can indicate the fault state through a display screen or other means, which can help maintenance personnel quickly and accurately judge the fault type and fault cause. Moreover, during the working process of the present invention, no large current will be formed in the electrical circuit, avoiding component burnout, and effectively improving the service life of the device. Brief Description of the Drawings

[0018] Figure 1 It is the schematic diagram of the device of the present invention.

[0019] In the figure: 1. Resistance plate, 2. Position detection travel switch, 3. Detection wire, 4. Controller, 1-1 Detection resistance A, 1-2 Detection resistance B, 2-1 Normally open switch, 2-2 Normally closed switch. Detailed implementation method

[0020] To further illustrate the technical solution details and its advantages of the present invention, it is described below in conjunction with the attached drawings.

[0021] As Figure 1 shown, the leg line fault self-diagnosis device of the aerial work vehicle includes four independent detection circuits, which are respectively used to detect the compaction conditions and line faults of the left front vertical leg, right front vertical leg, left rear vertical leg and right rear vertical leg. Since the composition of each circuit is exactly the same, one of the circuits is used as an example for the embodiment here.

[0022] The leg line fault self-diagnosis device of the aerial work vehicle includes a controller 4, a detection resistance plate 1 and a position detection travel switch 2; the detection resistance plate 1 is composed of a detection resistance A 1-1 and a detection resistance B 1-2, the resistance value of the detection resistance A 1-1 is 2 KΩ, and the resistance value of the detection resistance B 1-2 is 5.1 KΩ; the position detection travel switch 2 includes a normally open switch 2-1 and a normally closed switch 2-2; the detection resistance A 1-1 and the detection resistance B 1-2 are respectively connected in series with the normally open switch 2-1 and the normally closed switch 2-2; the position detection travel switch 2 is connected to the input end of the controller 4 through a detection wire 3, and the travel switch with a built-in common terminal (COM terminal) can directly lead out the detection wire from the COM terminal. One end of the detection wire 3 is connected to the common terminal of the two sets of contacts of the position detection travel switch 2, and the other end is connected to the analog input port of the controller 4. The resistance-type input port of the controller 4 preferably has a detection range of 0~10 KΩ.

[0023] The controller 4 judges the fault types according to the detected branch resistance as follows:

[0024] Result 1: In the case of no fault, when the vertical leg is not compacted in place, the normally open switch 2-1 is in the open state, the normally closed switch 2-2 is in the closed state, and the resistance value detected by the controller 4 is the resistance value of the detection resistance B 1-2, which is 5.1 KΩ;

[0025] Result 2: In the case of no fault, when the vertical leg is compacted in place, the normally open switch 2-1 is in the closed state, the normally closed switch 2-2 is in the open state, and the resistance value detected by the controller 4 is the resistance value of the detection resistance A 1-1, which is 2 KΩ;

[0026] Result 3: When a fault occurs where the two sets of contacts of the detection travel switch 2 are simultaneously conducting, the resistance value detected by the controller 4 is the parallel resistance value of the detection resistance A 1-1 and the detection resistance B 1-2, which is 1.44 KΩ;

[0027] Result 4: When a fault occurs where two sets of contacts of the detection travel switch 2 are simultaneously disconnected, the resistance value detected by the controller 4 is infinite;

[0028] Result 5: When a short circuit occurs in the detection wire 3, the resistance value detected by the controller 4 is 0 ohm;

[0029] Result 6: When an open circuit occurs in the detection wire 3, the resistance value detected by the controller 4 is infinite.

[0030] The controller 4 can diagnose the working state and fault type of the detection switch and the circuit by collecting the resistance value through the analog input port, and indicate the fault state through the display screen or the GPS terminal, which can help the maintenance personnel quickly and accurately judge the fault and the cause of the fault.

Claims

1. A self-diagnosis method for the outrigger circuit of an aerial work platform, using a self-diagnosis device for the outrigger circuit of an aerial work platform, including a controller (4), a detection resistor board (1), and a position detection travel switch (2); the detection resistor board (1) consists of a detection resistor A (1-1) and a detection resistor B (1-2), and the resistance values of the detection resistor A (1-1) and the detection resistor B (1-2) are different; the position detection travel switch (2) includes a normally open switch (2-1) and a normally closed switch (2-2); the detection resistor A (1-1) and the detection resistor B (1-2) are respectively connected in series with the normally open switch (2-1) and the normally closed switch (2-2); the position detection travel switch (2) is connected to the input end of the controller (4). Characterized in that: This method includes the following steps: S1: Install the position detection travel switch (1) on the vertical outrigger of the aerial work platform, connect it to the input end of the controller (4) through a detection wire (3), and the controller (4) detects the branch resistance. S2: The controller judges the fault type according to the detected branch resistance, and there are the following situations: Result 1: In the case of no fault, when the vertical outrigger is not compacted in place, the normally open switch (2-1) is in the open state, the normally closed switch (2-2) is in the closed state, and the resistance value detected by the controller (4) is the resistance value of the detection resistor B (1-2). Result 2: In the case of no fault, when the vertical outrigger is compacted in place, the normally open switch (2-1) is in the closed state, the normally closed switch (2-2) is in the open state, and the resistance value detected by the controller (4) is the resistance value of the detection resistor A (1-1). Result 3: When a fault occurs where both sets of contacts of the detection travel switch (2) are conducting simultaneously, the resistance value detected by the controller (4) is the parallel resistance value of the detection resistor A (1-1) and the detection resistor B (1-2). Result 4: When a fault occurs where both sets of contacts of the detection travel switch (2) are disconnected simultaneously, the resistance value detected by the controller (4) is infinite.

2. The self-diagnosis method for the outrigger circuit of an aerial work platform according to claim 1, Characterized in that: The following situations are also included in the step S2: Result 5: When the detection wire (3) is short-circuited, the resistance value detected by the controller (4) is 0 ohm. Result 6: When the detection wire (3) is open-circuited, the resistance value detected by the controller (4) is infinite.

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