Off-line detection equipment for sensor in rail transit system

Abstract

The utility model discloses off-line detection equipment for a sensor in a rail transit system. The off-line detection equipment comprises a power supply device, a testing device and a control device, the power supply device comprises a power supply and a plurality of contactors and is used for providing a test power supply for the sensor in the test device; the testing device comprises a plurality of sensors to be tested; the control device is in communication connection with the power supply device and the test device, and is used for controlling opening and closing of a contactor in the power supply device, adjusting a power supply of the power supply device, enabling the power supply to output a corresponding test power supply, and selecting any corresponding to-be-tested sensor for offline test. According to the utility model, off-line full-load detection can be carried out on the sensor involved in the vehicle-mounted system, the detection efficiency is high, and the detection effect is good.

Description

Technical Field

[0001] The utility model belongs to the field of detection equipment of sensors in rail transit systems, and in particular relates to off-line detection equipment of sensors in rail transit systems. Background Art

[0002] Rail transit systems have gradually become popular in many cities. With the increase in the number of subway trains and the increase in the number of years of operation, the number of trains entering the overhaul is increasing. The sensors in the on-board system need to be tested regularly to ensure the normal operation of the train. However, there has been a lack of offline detection equipment for sensors in rail transit systems. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes an off-line detection device for sensors in a rail transit system.

[0004] In order to achieve the above object, the technical solution of the utility model is as follows:

[0005] The utility model discloses an off-line detection device for a sensor in a rail transit system, comprising: a power supply device, a test device and a control device;

[0006] The power supply device includes: a power supply and a plurality of contactors, which are used to provide test power to the sensors in the test device;

[0007] The test device includes: a plurality of sensors to be tested;

[0008] The control device is respectively connected to the power supply device and the test device for controlling the opening and closing of the contactor in the power supply device, adjusting the power supply of the power supply device to output the corresponding test power, and selecting any corresponding sensor to be tested for offline testing.

[0009] Based on the above technical solution, the following improvements can be made:

[0010] As a preferred solution, the power supply device includes: an adjustable constant current source P1, an adjustable constant voltage source P2, a power supply contactor K1, a power supply contactor K2, an output contactor K3, and an output contactor K4;

[0011] The input end of the adjustable constant current source P1 is electrically connected to the external input power supply through the power supply contactor K1, and the output end thereof is electrically connected to a plurality of current sensors in the test device through the output contactor K3, so as to form a first test loop;

[0012] The input end of the adjustable constant voltage source P2 is electrically connected to the external input power supply through the power supply contactor K2, and the output end thereof is electrically connected to a plurality of voltage sensors in the test device through the output contactor K4, so as to form a second test loop;

[0013] The adjustable constant current source P1, the adjustable constant voltage source P2, the power supply contactor K1, the power supply contactor K2, the output contactor K3, and the output contactor K4 are respectively connected to the control device for communication.

[0014] As a preferred solution, the power supply device further includes: a current reference sampling sensor V1 and a voltage reference sampling sensor V2;

[0015] The current reference sampling sensor V1 is connected in series in the first test loop;

[0016] The voltage reference sampling sensor V2 is connected in parallel in the second test loop;

[0017] The current reference sampling sensor V1 and the voltage reference sampling sensor V2 are respectively connected to the control device for communication.

[0018] As a preferred solution, the test device includes: a plurality of current sensors to be tested and a plurality of voltage sensors to be tested;

[0019] All current sensors to be tested are connected in series in the first test loop;

[0020] All voltage sensors to be tested are connected in parallel in the second test circuit;

[0021] The current sensor to be tested and the voltage sensor to be tested are both in communication connection with the control device.

[0022] As a preferred solution, the control device includes: a controller and a main power supply;

[0023] The main power supply is used to provide power to the controller;

[0024] The controller is used to control the opening and closing of the power supply contactor K1, the power supply contactor K2, the output contactor K3, and the output contactor K4, to adjust the output value of the adjustable constant current source P1 and the adjustable constant voltage source P2, and to collect feedback data from the current reference sampling sensor V1, the voltage reference sampling sensor V2, the current sensor to be tested, and the voltage sensor to be tested.

[0025] As a preferred solution, the controller includes: a MUC unit, a DAC analog output unit, a contactor control unit, a contactor feedback unit, a reference sampling unit, a multiplexing unit and a plurality of ADC sampling units;

[0026] The MUC unit is electrically connected to the DAC analog output unit, the contactor control unit, the contactor feedback unit, the reference sampling unit, and the multiplexing unit respectively to realize the central control;

[0027] The DAC analog output unit is used to convert the output value signal of the adjustable constant current source P1 and the adjustable constant voltage source P2 sent by the MUC unit into a signal that the adjustable constant current source P1 and the adjustable constant voltage source P2 can accept;

[0028] The contactor control unit is used to isolate the contactor signal sent by the MUC unit and control the corresponding contactor action;

[0029] The contactor feedback unit is used to isolate the corresponding contactor status signal and transmit it back to the MUC unit;

[0030] The reference sampling unit is used to collect feedback data from the current reference sampling sensor V1 and the voltage reference sampling sensor V2, and transmit it back to the MUC unit;

[0031] A plurality of ADC sampling units are used to collect feedback data of the current sensor to be tested and the voltage sensor to be tested;

[0032] The multiplexing unit is used to select the corresponding ADC sampling unit and transmit the sampled data back to the MUC unit.

[0033] As a preferred solution, an ADC sampling unit is correspondingly connected to a current sensor to be tested or a voltage sensor to be tested.

[0034] As a preferred solution, the controller further includes: an internal power supply, which is electrically connected to the main power supply and is used to convert the main power supply into the operating voltage required by each unit in the controller.

[0035] As a preferred solution, the control device also includes: a host computer, which is communicatively connected with the controller and is used to set parameters for the controller and realize human-computer interaction.

[0036] The utility model discloses an off-line detection device for sensors in a rail transit system, which can perform off-line full-load detection on sensors involved in the vehicle-mounted system, has high detection efficiency and good detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is a schematic diagram of an offline detection device provided in an embodiment of the utility model.

[0039] Figure 2This is a ±15V analog unit power supply circuit diagram of the internal unit provided in an embodiment of the utility model.

[0040] Figure 3 A +15V digital unit power supply circuit diagram of an internal unit provided in an embodiment of the utility model.

[0041] Figure 4 A +5V MCU unit power supply circuit diagram provided in an embodiment of the utility model.

[0042] Figure 5 A +3.3V MCU unit power supply circuit diagram provided for an embodiment of the utility model.

[0043] Figure 6 A circuit diagram of a contactor feedback unit provided in an embodiment of the utility model.

[0044] Figure 7 A circuit diagram of a contactor control unit provided in an embodiment of the utility model.

[0045] Figure 8 A circuit diagram of a DAC analog output unit provided in an embodiment of the utility model.

[0046] Fig. 9 A reference power supply circuit diagram of an ADC sampling unit provided in an embodiment of the utility model.

[0047] Fig.10 A circuit diagram of a 12-bit ADC sampling unit provided in an embodiment of the utility model.

[0048] Fig.11 A circuit diagram of a multiple-way selection unit provided in an embodiment of the utility model.

[0049] Among them: 1 power supply device 1, 2 testing device 2 and 3 control device 3. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0052] In addition, the expression of “comprising” an element is an “open” expression, which simply means that a corresponding component exists, and should not be interpreted as excluding additional components.

[0053] In order to achieve the purpose of the utility model, in some embodiments of an offline detection device for a sensor in a rail transit system, as Figure 1 As shown, the offline detection device includes: a power supply device 1, a test device 2 and a control device 3;

[0054] The power supply device 1 comprises: a power supply and a plurality of contactors, which are used to provide a test power supply for the sensor in the test device;

[0055] The testing device 2 comprises: a plurality of sensors to be tested;

[0056] The control device 3 is respectively connected to the power supply device and the test device for controlling the opening and closing of the contactor in the power supply device, adjusting the power supply of the power supply device to output the corresponding test power, and selecting any corresponding sensor to be tested for offline testing.

[0057] Each device is described in detail below.

[0058] Further, the power supply device 1 includes: an adjustable constant current source P1, an adjustable constant voltage source P2, a power supply contactor K1, a power supply contactor K2, an output contactor K3, and an output contactor K4;

[0059] The input end of the adjustable constant current source P1 is electrically connected to an external input power source (380VAC power source) through a power supply contactor K1, and the output end thereof is electrically connected to a plurality of current sensors in the test device through an output contactor K3, forming a first test loop;

[0060] The input end of the adjustable constant voltage source P2 is electrically connected to the external input power supply through the power supply contactor K2, and the output end thereof is electrically connected to a plurality of voltage sensors in the test device through the output contactor K4, so as to form a second test loop;

[0061] The adjustable constant current source P1, the adjustable constant voltage source P2, the power supply contactor K1, the power supply contactor K2, the output contactor K3, and the output contactor K4 are respectively connected to the control device for communication.

[0062] The power supply contactor K1, the power supply contactor K2, the output contactor K3 and the output contactor K4 are controlled by the control device. The adjustable constant current source P1 can output any adjustable DC current of 0 to 4KA after conversion, and the adjustable constant voltage source P2 can output any adjustable DC voltage of 0 to 2KV after conversion.

[0063] Further, the power supply device 1 also includes: a current reference sampling sensor V1 and a voltage reference sampling sensor V2;

[0064] The current reference sampling sensor V1 is connected in series in the first test loop;

[0065] The voltage reference sampling sensor V2 is connected in parallel in the second test loop;

[0066] The current reference sampling sensor V1 and the voltage reference sampling sensor V2 are respectively connected to the control device for communication.

[0067] The current reference sampling sensor V1 and the voltage reference sampling sensor V2 provide the control device with a real-time measured reference value of the power supply in the circuit.

[0068] Further, the test device 2 comprises: a plurality of current sensors (IT1-ITn) to be tested and a plurality of voltage sensors (IT1-ITn) to be tested;

[0069] All current sensors to be tested are connected in series in the first test loop;

[0070] All voltage sensors to be tested are connected in parallel in the second test circuit;

[0071] The current sensor to be tested and the voltage sensor to be tested are both in communication connection with the control device.

[0072] The test device provides two sets of test interfaces for current and voltage Hall sensors respectively. The number of single tests can be freely expanded according to actual needs.

[0073] Furthermore, the control device 3 includes: a controller and a main power supply.

[0074] The main power supply is used to convert 220VAC into 24VDC to provide power for the controller;

[0075] The controller is used to control the opening and closing of the power supply contactor K1, the power supply contactor K2, the output contactor K3, and the output contactor K4, to adjust the output value of the adjustable constant current source P1 and the adjustable constant voltage source P2, and to collect feedback data from the current reference sampling sensor V1, the voltage reference sampling sensor V2, the current sensor to be tested, and the voltage sensor to be tested.

[0076] Furthermore, the controller includes: a MUC unit, a DAC analog output unit, a contactor control unit, a contactor feedback unit, a reference sampling unit, a multiplexing unit, an internal power supply and a plurality of ADC sampling units.

[0077] The MUC unit is electrically connected to the DAC analog output unit, the contactor control unit, the contactor feedback unit, the reference sampling unit, and the multiplexing unit respectively to realize central control.

[0078] The MUC unit can be controlled by a single-chip microcomputer, ARM or DSP as the core. As the core component of the offline detection equipment, the unit can adopt the minimum system independent board design to facilitate maintenance and repair.

[0079] The DAC analog output unit is used to convert the output value signals of the adjustable constant current source P1 and the adjustable constant voltage source P2 sent by the MUC unit into signals that can be accepted by the adjustable constant current source P1 and the adjustable constant voltage source P2.

[0080] The main function of the DAC analog output unit is to isolate and amplify the signal (0-3.3V) sent by the MCU unit to adjust the output value of the constant current and constant voltage source into a voltage (0-10V) or current (4-20mA) signal that the controlled object can accept. Figure 8 shown.

[0081] The contactor control unit is used to isolate the contactor signal sent by the MUC unit and control the corresponding contactor action, such as Figure 7 shown.

[0082] The circuit of the contactor control unit is designed with a self-check circuit. When the MCU control signal drives D8A to act, Q7 acts accordingly, and D8B returns a pulse signal to the MCU (the pulse width is determined by the capacitance of C76). When C76 is fully discharged, the external controlled contactor K6 is energized. If the MCU issues a control command but does not receive a signal returned by D6E, the system determines that there is a fault in this hardware circuit and prompts a corresponding alarm.

[0083] The contactor feedback unit is used to isolate the corresponding contactor status signal and transmit it back to the MUC unit, such as Figure 6 shown.

[0084] When the circuit of the contactor feedback unit is collecting data, only when the MCU unit controls D7A to work, can the external feedback information be sent to the MCU unit through D7B isolation. When the MCU unit is abnormal, D7A blocks external data collection, and the external input signal is invalid, protecting the system safety.

[0085] The reference sampling unit is used to collect feedback data from the current reference sampling sensor V1 and the voltage reference sampling sensor V2, and transmit it back to the MUC unit.

[0086] The signals collected in real time by the current reference sampling sensor V1 and the voltage reference sampling sensor V2 are converted by the independent reference sampling unit of the controller and then transmitted to the MCU unit of the controller.

[0087] The internal power supply is electrically connected to the main power supply and is used to convert the main power supply into the operating voltage required by each unit in the controller. Specifically, it includes the following four groups of independent DC / DC power supplies.

[0088] 1) Analog circuit working power supply (±15VDC), such as Figure 2 shown.

[0089] 2) Digital circuit working power supply (+15VDC), such as Figure 3 shown.

[0090] 3) The working power supply of the MCU unit (+5VDC), such as Figure 4 shown.

[0091] 4) The working power supply of the MCU unit (+3.3VDC), such as Figure 5 shown.

[0092] The internal power supply design can improve the compatibility of this controller, avoid dependence on external power supply, and simplify external power supply.

[0093] A plurality of ADC sampling units are used to collect feedback data of the current sensor to be tested and the voltage sensor to be tested.

[0094] The ADC sampling unit serves as a bridge between the sensor and the MCU unit, and is used to convert the signals collected by each sensor into signals that can be received by the MCU unit. This unit can be designed as an independent board to facilitate network expansion. The structure is as follows Figure 4 shown.

[0095] Specifically, this circuit is compatible with the sampling of feedback signals from sensors with two output types, voltage and current. By adjusting the resistance value of R95, it can adapt to the sampling of current-type feedback signals of different signals. When the resistance at the position of R95 is removed and the resistance values ​​of R88, R89, R100, R101, and R96 are adjusted at the same time, it can adapt to the sampling of voltage-type feedback signals of different signals. In addition, when the sensor samples an AC signal, just leave R104 suspended and install a 0Ω resistor in R102; conversely, when the sensor samples a DC signal, just leave R102 suspended and install a 0Ω resistor in R104. The principle is as follows: Fig.10 ADC_Vref is a 1.5V sampling reference voltage source. Fig. 9 As shown in the figure, the ADC conversion chip can be selected as 8-bit, 12-bit, 16-bit or 32-bit according to actual needs, which will not be described in detail here.

[0096] The multiplexing unit is used to select the corresponding ADC sampling unit and transmit the sampled data back to the MUC unit. Fig.11 shown.

[0097] It is worth noting that one ADC sampling unit is correspondingly connected in communication with one current sensor to be tested or one voltage sensor to be tested.

[0098] Each sensor to be tested adopts a modular design with independent working voltage and independent ADC sampling unit, which does not interfere with each other and is easy to expand.

[0099] Furthermore, the control device also includes: a host computer, which is communicatively connected with the controller and is used to set parameters for the controller and realize human-computer interaction.

[0100] The host computer can be, but is not limited to, a computer. The host computer can also be connected to a printer for printing a test result report generated by the host computer.

[0101] The working process of the utility model is described below.

[0102] 1) Enter the relevant information of the sensor to be tested into the host computer and create a file. During the test, the host computer writes the relevant parameters into the MCU unit.

[0103] For example, the model of the current sensor to be tested is LA-205S, the upper current limit is 800A, and the number of sampling nodes is 8.

[0104] The model of the voltage sensor to be tested is LV100-2000, the voltage upper limit is 2000V, and the number of sampling nodes is 20.

[0105] 2) Connect the output end of a sensor under test to an ADC sampling unit.

[0106] 3) Taking two current sensors (LA-205S) installed at S1 and S5 as an example, the constant current source adjustment signal is 4~20mA corresponding to 0~4KA.

[0107] 4) The testing process is as follows:

[0108] The controller controls the power supply contactor K2 and the output contactor K3 to close.

[0109] The DAC analog output unit outputs 4.4mA, controls the adjustable constant current source P1 to maintain an output of 100A, and the MCU unit reads the sampling data of the current reference sampling sensor V1. The MCU unit controls the multiplexing unit to select the corresponding ADC sampling unit, reads the sampling data of the S1 position sensor, and stores it. After storage, the MCU unit controls the multiplexing unit to select the corresponding ADC sampling unit, reads the sampling data of the S5 position sensor, and completes the data collection of all sensors of a node.

[0110] The DAC analog output unit outputs 4.8mA, controls the adjustable constant current source P1 to maintain an output of 200A, and the MCU unit collects the data of the S1 and S5 position sensors.

[0111] Repeat the above steps until the sensor completes collecting 0-800A data.

[0112] 5) When all tests are completed, the MCU unit will transmit the collected data to the host computer.

[0113] The utility model discloses an off-line detection device for sensors in a rail transit system, which can perform off-line full-load detection on sensors involved in the vehicle-mounted system, has high detection efficiency and good detection effect.

[0114] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0115] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0116] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

[0117] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.

Claims

1. Offline detection equipment for sensors in rail transit systems, characterized in that: include: Power supply, test and control devices; The power supply device comprises: a power supply and a plurality of contactors, which are used to provide test power to the sensor in the test device; The testing device comprises: a plurality of sensors to be tested; The control device is respectively connected to the power supply device and the test device for controlling the opening and closing of the contactor in the power supply device, adjusting the power supply of the power supply device to output the corresponding test power, and selecting any corresponding sensor to be tested for offline testing.

2. The off-line detection device according to claim 1, characterized in that: The power supply device includes: an adjustable constant current source P1, an adjustable constant voltage source P2, a power supply contactor K1, a power supply contactor K2, an output contactor K3, and an output contactor K4; The input end of the adjustable constant current source P1 is electrically connected to an external input power source through a power supply contactor K1, and the output end thereof is electrically connected to a plurality of current sensors in the test device through an output contactor K3, so as to form a first test loop; The input end of the adjustable constant voltage source P2 is electrically connected to the external input power supply through the power supply contactor K2, and the output end thereof is electrically connected to a plurality of voltage sensors in the test device through the output contactor K4, so as to form a second test loop; The adjustable constant current source P1, the adjustable constant voltage source P2, the power supply contactor K1, the power supply contactor K2, the output contactor K3, and the output contactor K4 are respectively connected to the control device for communication.

3. The off-line detection device according to claim 2, characterized in that: The power supply device further comprises: a current reference sampling sensor V1 and a voltage reference sampling sensor V2; The current reference sampling sensor V1 is connected in series in the first test loop; The voltage reference sampling sensor V2 is connected in parallel in the second test loop; The current reference sampling sensor V1 and the voltage reference sampling sensor V2 are respectively connected to the control device for communication.

4. The off-line detection device according to claim 3, characterized in that: The testing device comprises: a plurality of current sensors to be tested and a plurality of voltage sensors to be tested; All current sensors to be tested are connected in series in the first test loop; All voltage sensors to be tested are connected in parallel in the second test circuit; The current sensor to be tested and the voltage sensor to be tested are both in communication connection with the control device.

5. The off-line detection device according to claim 4, characterized in that: The control device comprises: a controller and a main power supply; The main power supply is used to provide power to the controller; The controller is used to control the opening and closing of the power supply contactor K1, the power supply contactor K2, the output contactor K3, and the output contactor K4, to adjust the output values ​​of the adjustable constant current source P1 and the adjustable constant voltage source P2, and to collect feedback data of the current reference sampling sensor V1, the voltage reference sampling sensor V2, the current sensor to be tested, and the voltage sensor to be tested.

6. The off-line detection device according to claim 5, characterized in that: The controller includes: a MUC unit, a DAC analog output unit, a contactor control unit, a contactor feedback unit, a reference sampling unit, a multiplexing unit and a plurality of ADC sampling units; The MUC unit is electrically connected to the DAC analog output unit, the contactor control unit, the contactor feedback unit, the reference sampling unit, and the multiplexing unit, respectively, for realizing central control; The DAC analog output unit is used to convert the output value signal of the adjustable constant current source P1 and the adjustable constant voltage source P2 sent by the MUC unit into a signal that the adjustable constant current source P1 and the adjustable constant voltage source P2 can accept; The contactor control unit is used to isolate the contactor signal sent by the MUC unit and control the corresponding contactor action; The contactor feedback unit is used to isolate the corresponding contactor status signal and transmit it back to the MUC unit; The reference sampling unit is used to collect feedback data from the current reference sampling sensor V1 and the voltage reference sampling sensor V2, and transmit the feedback data back to the MUC unit; The ADC sampling units are used to collect feedback data of the current sensor to be tested and the voltage sensor to be tested; The multiplexing unit is used to select the corresponding ADC sampling unit and transmit the sampled data back to the MUC unit.

7. The off-line detection device according to claim 6, characterized in that: One of the ADC sampling units is correspondingly connected in communication with one current sensor to be tested or one voltage sensor to be tested.

8. The off-line detection device according to claim 6, characterized in that: The controller further comprises: an internal power supply, which is electrically connected to the main power supply and is used for converting the main power supply into the working voltage required by each unit in the controller.

9. The off-line detection device according to any one of claims 5 to 8, characterized in that: The control device further comprises: a host computer, which is communicatively connected with the controller and is used to set parameters for the controller and realize human-computer interaction.

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