Vehicle-mounted relay electrical characteristic testing device

Abstract

An electrical characteristic testing device for a vehicle-mounted relay belongs to the technical field of electrical element detection and comprises a main control board, a voltage and current display meter, a resistance meter, a switching power supply, an industrial control all-in-one machine, a temperature and humidity sensor and a direct-current programmable power supply, a G port of the voltage and current display meter and an I-port of the voltage and current display meter are connected in parallel to a negative electrode output port of the direct-current programmable power supply, a V port of the voltage and current display meter and an I + port of the voltage and current display meter are connected in parallel to the main control board, and a positive electrode output port of the direct-current programmable power supply is connected with the main control board. A communication positive electrode interface of the temperature and humidity sensor, a communication port A of the direct-current programmable power supply, a communication port A of the voltage and current display meter and the resistance meter are connected in parallel and then connected to an RXD port of the industrial control all-in-one machine and the like. According to the utility model, automatic testing of electrical characteristics of the vehicle-mounted relay is realized, manpower is reduced, testing time is shortened, and testing efficiency and accuracy are improved.

Description

Technical Field

[0001] This utility model belongs to the field of electrical component testing technology, and in particular relates to a device for testing the electrical characteristics of vehicle relays. Background Technology

[0002] As a crucial component of the emergency braking circuit of high-speed trains, on-board relays are essential for ensuring the reliable and stable operation of these trains. On-board relay testing equipment is primarily used for the testing and acceptance of on-board relays. In addition to regularly receiving a large number of new relays, the maintenance depot also needs to periodically test the electrical characteristics of relays in use to ensure they meet requirements. Relay testing and acceptance typically require short lead times and high precision.

[0003] Currently, domestic signal maintenance depots typically use relay testing devices to test various parameters of onboard relays. However, onboard relays need to be collected and transported back to the maintenance depot for unified maintenance on a regular basis, making on-site testing impossible. Regular maintenance not only requires replacing all onboard relays in use, but also wastes time during transportation. The onboard relay maintenance and testing tasks are heavy, the testing period is short, and the maintenance depot is under great pressure. Utility Model Content

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a vehicle relay electrical characteristic testing device, which realizes automatic testing of vehicle relay electrical characteristics, reduces manpower, shortens testing time, and improves testing efficiency and accuracy.

[0005] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0006] A vehicle-mounted relay electrical characteristic testing device includes a main control board, a voltage and current display meter, a resistance meter, a switching power supply, an industrial control computer, a temperature and humidity sensor, and a DC power supply. The main control board is connected to the industrial control computer via a serial port. The main control board is also connected to the resistance meter and the switching power supply. The temperature and humidity sensor is connected to the switching power supply. The G port and I- port of the voltage and current display meter are connected in parallel to the negative output port of the DC power supply. The V port and I+ port of the voltage and current display meter are connected in parallel to the main control board. The positive output port of the DC power supply is connected to the main control board. The positive communication interface of the temperature and humidity sensor and the communication interface of the DC power supply are also connected. Port A of the voltage and current display meter, communication port A of the voltage and current display meter, and resistance meter are connected in parallel to the RXD port of the industrial control computer. The negative communication interface of the temperature and humidity sensor, communication port B of the DC power supply, communication port B of the voltage and current display meter, and resistance meter are connected in parallel to the TXD port of the industrial control computer. The industrial control computer is connected to the main control board through the communication interface DB9. The main control board is provided with a main control board connection terminal for connecting to the relay test base. The main control board is provided with a microcontroller. Each input pin of the microcontroller is used to connect to the series circuit and parallel circuit of the relay contacts under test. Each output pin of the microcontroller is used to connect to the logic switching control circuit of the test circuit of the relay under test.

[0007] Furthermore, the main control board includes a main control circuit, a logic conversion circuit, a communication circuit, and a logic conversion control circuit. The main control circuit is connected to the communication circuit, and the communication circuit is connected to the communication interface COM1. The main control circuit is also connected to the logic conversion control circuit, and the logic conversion control circuit is connected to the logic conversion circuit. The logic conversion control circuit is also connected to the switching power interface CZ4. The logic conversion circuit is connected to the resistance test interface CZ3, the drive power interface CZ5, and the relay test base connection terminals CZ1-CZ2.

[0008] Furthermore, the main control circuit includes a PIC18 integrated circuit, a crystal oscillator circuit, and an address selection circuit. The PIC18 integrated circuit is connected to the crystal oscillator circuit and the starting capacitor through pins 13 and 14. Pin 27 of the PIC18 integrated circuit is connected in parallel with pull-up resistor R15 and jumper terminal JP3, pin 28 is connected in parallel with pull-up resistor R14 and jumper terminal JP4, pin 29 is connected in parallel with pull-up resistor R13 and jumper terminal JP5, and pin 30 is connected in parallel with pull-up resistor R12 and jumper terminal JP6 to form the address selection circuit. Pins 25 and 26 of the PIC18 integrated circuit are connected to the communication circuit, and pins RA0, RA1, and RA2 of the PIC18 integrated circuit are connected to the logic conversion control circuit.

[0009] Furthermore, the communication circuit consists of a MAX232 communication chip and peripheral circuits. Pins 11 and 12 of the MAX232 communication chip are connected to the main control circuit, and the communication circuit is connected to pins 2, 3, and 5 of the communication interface DB9 through pins 13, 14, and 15 of the MAX232 communication chip, respectively.

[0010] Furthermore, the logic conversion circuit consists of a Panasonic relay DS2Y-S-DC24V and a high-frequency small-signal diode 1N4148. The negative terminal of the diode 1N4148 is connected to pin 1 of the Panasonic relay, and the positive terminal is connected to pin 16 of the Panasonic relay. The output terminal of the ULN2003 driver array of the logic conversion control circuit is connected to pin 16 of the Panasonic relay, and pin 1 is connected to 24V+. The state conversion of one or more Panasonic relays is completed according to the output state of the ULN2003 driver array, and a test circuit is built.

[0011] Furthermore, the logic conversion control circuit includes a 74hc595 driver circuit and a ULN2003 driver array. The 74hc595 driver circuit includes three 74hc595 driver chips U3, U4, and U5. Pin 9 of driver chip U3 is connected to pin DS of driver chip U4, and pin 9 of driver chip U4 is connected to pin DS of driver chip U5 to form a cascaded circuit. Pins DS, SH_CP, and ST_CP of driver chip U3 are connected to the active circuit, pins SH_CP and ST_CP of driver chip U4 are connected to the main control circuit, and pins SH_CP and ST_CP of driver chip U5 are connected to the main control circuit. The output terminal of the 74hc595 driver circuit is connected to the input terminal of the ULN2003 driver array. The ULN2003 driver array includes chips IC1, IC2, and IC3. Pin 9 of IC1, IC2, and IC3 is connected to terminal CZ4-1, and pin 8 is connected to terminal CZ4-2.

[0012] Furthermore, the 24V output port of the switching power supply is connected in parallel with the connection terminal CZ4-2 of the main control board, the output port COM2 of the switching power supply is connected in parallel with the connection terminal CZ4-1 of the main control board, the 5V output port of the switching power supply is connected in parallel with the connection terminal CZ4-4 of the main control board, and the output port COM1 of the switching power supply is connected in parallel with the connection terminal CZ4-3 of the main control board.

[0013] Furthermore, the 24V output port of the switching power supply is connected in parallel with the VCC of the temperature and humidity sensor, and the COM2 output port of the switching power supply is connected in parallel with the GND of the temperature and humidity sensor.

[0014] Furthermore, the device performs electrical characteristic tests on the vehicle relay, including contact resistance, coil resistance, set voltage, reset voltage, pull-in time, release time, and bounce-back time.

[0015] Furthermore, the vehicle-mounted relays include bistable relays and monostable relays, wherein the bistable relays include JC-B040 and SBMGS-400-110; and the monostable relays include JC-A040 and AMGS-400-130.

[0016] The beneficial effects of this invention are as follows: This invention enables automatic testing of parameters such as contact resistance, coil resistance, set voltage (pull-in voltage), reset voltage (release voltage), pull-in time, and release time of vehicle-mounted relays. Test results are automatically saved, the testing process requires no manual intervention, and the test results are relatively accurate. In particular, the test of the bounce time is automatically measured, greatly shortening the testing time and improving testing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the vehicle-mounted relay electrical characteristic testing device of this utility model;

[0018] Figure 2 This is a schematic diagram of the connection between the switching power supply and the main control board CZ4;

[0019] Figure 3 This is a schematic diagram showing the connection between the industrial control all-in-one computer, the temperature and humidity sensor, and the DC power supply.

[0020] Figure 4 This is a schematic diagram of the structure of an industrial control all-in-one computer;

[0021] Figure 5 A schematic diagram of the main control board structure;

[0022] Figure 6 A schematic diagram of the main control board interface;

[0023] Figure 7 This is a schematic diagram of a vehicle-mounted relay base;

[0024] Figure 8 A schematic diagram of the main control circuit of the main control board;

[0025] Figure 9 A schematic diagram of the logic conversion circuit of the main control board;

[0026] Figure 10 A schematic diagram of the communication circuit of the main control board;

[0027] Figure 11 This is a schematic diagram of the logic conversion control circuit of the main control board.

[0028] In the diagram: 1 is the main control board, 2 is the voltage and current display meter, 3 is the resistance meter, 4 is the switching power supply, 5 is the industrial control all-in-one machine, 6 is the temperature and humidity sensor, 7 is the DC flow control power supply, 8 is the main control circuit, 9 is the communication circuit, 10 is the logic conversion control circuit, and 11 is the logic conversion circuit. Detailed Implementation

[0029] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] This utility model provides a device for testing the electrical characteristics of vehicle-mounted relays, such as... Figure 1 As shown, the system includes a main control board 1, a voltage and current display meter 2, a resistance meter 3, a switching power supply 4, an industrial control all-in-one computer 5, a temperature and humidity sensor 6, and a DC power supply 7. The main control board 1 is connected to the industrial control all-in-one computer 5 via a serial port. Specifically, the industrial control all-in-one computer 5 can be an LJD-eWinA8-LH070, using RS232 full-duplex serial communication mode to connect with the main control board, ensuring the accuracy of information transmission. The main control board 1 is connected to the resistance meter 3 and the switching power supply 4, and the temperature and humidity sensor 6 is connected to the switching power supply 4. Specifically, the industrial control all-in-one computer 5 uses RS2485 half-duplex communication mode to communicate with the voltage and current display meter 2, the resistance meter 3, the DC power supply 7, and the temperature and humidity sensor 6 respectively. The communication adopts a master-slave query-response mode to prevent mutual interference between the devices. Specifically, the test ports 1, 2, 3 and 4 of the ohmmeter 3 are connected to the CZ3-2, CZ3-1, CZ3-4 and CZ3-3 terminals of the main control board 1, respectively. The test contacts are switched and selected by the logic circuit of the main control board 1 to complete the test of the relay contact resistance and coil resistance.

[0031] like Figure 1 and 2 As shown, the 24V output port of the switching power supply 4 is connected in parallel with the connection terminal CZ4-2 of the main control board 1, the output port COM2 is connected in parallel with the connection terminal CZ4-1 of the main control board 1, the 5V output port of the switching power supply 4 is connected in parallel with the connection terminal CZ4-4 of the main control board 1, and the output port COM1 is connected in parallel with the connection terminal CZ4-3 of the main control board 1. The 24V output port of the switching power supply 4 is connected in parallel with the VCC of the temperature and humidity sensor 6, and the output port COM2 is connected in parallel with the GND of the temperature and humidity sensor 6.

[0032] The G port and I- port of the voltage and current display meter 2 are connected in parallel to the negative output port of the DC current control power supply 7. The V port and I+ port of the voltage and current display meter 2 are connected in parallel to the CZ5-1 port of the main control board 1. The positive output port of the DC current control power supply 7 is connected to the CZ5-2 terminal of the main control board to measure the voltage and current values ​​during the operation of the relay under test. Specifically, the 12 port and 8 port of the voltage and current display meter are connected in parallel to the negative output port of the DC current control power supply. The 11 port and 7 port of the voltage and current display meter are connected in parallel to the CZ5-1 port of the main control board. The negative output port is connected to the CZ5-2 terminal of the main control board. The DC current control power supply can power the relay to realize the automatic testing of the set voltage (pull-in voltage), reset voltage (release voltage), bounce time, pull-in time, and release time.

[0033] The positive communication interface of the temperature and humidity sensor 6, the communication port A of the DC power supply 7, the communication port A of the voltage and current display meter 2, and the ohmmeter 3 are connected in parallel to the RXD port of the industrial control computer 5; the negative communication interface of the temperature and humidity sensor 6, the communication port B of the DC power supply 7, the communication port B of the voltage and current display meter 2, and the ohmmeter 3 are connected in parallel to the TXD port of the industrial control computer 5. Specifically, the 485+ communication interface of the temperature and humidity sensor 6, port A of the DC power supply 7, port 4 of the voltage and current display meter, and port 7 of the ohmmeter are connected in parallel to the RXD port of the industrial control computer J10; the 485- communication interface of the temperature and humidity sensor, port B of the DC power supply 7, port 3 of the voltage and current display meter, and port 6 of the ohmmeter are connected in parallel to the TXD port of the industrial control computer J10 to complete the reading of relevant test data during the testing process.

[0034] The industrial control all-in-one computer 5 is connected to the main control board 1 via the communication interface DB9. The main control board 1 is provided with a main control board connection terminal for connecting to the relay test base. The main control board 1 is provided with a microcontroller. Each input pin of the microcontroller is used to connect to the series circuit and parallel circuit of the relay contacts under test. Each output pin of the microcontroller is used to connect to the logic switching control circuit of the test circuit of the relay under test.

[0035] like Figure 6-7 As shown, the terminals on the main control board 1, connecting terminals CZ1~CZ2, are respectively connected to the contacts corresponding to the relay test base JCZ.

[0036] like Figure 5As shown, the main control board 1 includes a main control circuit 8, a logic conversion circuit 11, a communication circuit 9, and a logic conversion control circuit 10. The main control circuit 8 is connected to the communication circuit 9, and the communication circuit 9 is connected to the communication interface COM1. The main control circuit 8 is also connected to the logic conversion control circuit 10, and the logic conversion control circuit 10 is connected to the logic conversion circuit 11. The logic conversion control circuit 10 is also connected to the switching power interface CZ4. The logic conversion circuit 11 is connected to the resistance test interface CZ3, the drive power interface CZ5, and the relay test base connection terminals CZ1-CZ2.

[0037] Specifically, such as Figure 8-11 As shown, the main control circuit 8 includes a PIC18 integrated circuit, a crystal oscillator circuit, and an address selection circuit. The PIC18 integrated circuit is connected to the crystal oscillator circuit and the starting capacitor through pins 13 and 14. Pin 27 of the PIC18 integrated circuit is connected in parallel with pull-up resistor R15 and jumper terminal JP3, pin 28 is connected in parallel with pull-up resistor R14 and jumper terminal JP4, pin 29 is connected in parallel with pull-up resistor R13 and jumper terminal JP5, and pin 30 is connected in parallel with pull-up resistor R12 and jumper terminal JP6, forming the address selection circuit. The PIC18 integrated circuit determines the address of the main control board by detecting the high and low level states of the corresponding pins.

[0038] The communication circuit 9 consists of a MAX232 communication chip and peripheral circuits. Pins 25 and 26 of the PIC18 integrated circuit are connected to pins 11 and 12 of the MAX232 communication chip U2, respectively. The communication circuit is connected to pins 2, 3 and 5 of the DB9 connector through pins 13, 14 and 15 of the MAX232 communication chip U2, respectively, to complete the information interaction between the main control board and external devices.

[0039] The logic conversion circuit 11 consists of a Panasonic DS2Y-S-DC24V relay and a high-frequency small-signal diode 1N4148. The cathode of the diode 1N4148 is connected to pin 1 of the Panasonic relay, and the anode is connected to pin 16 of the Panasonic relay. The output of the ULN2003 driver array of the logic conversion control circuit is connected to pin 16 of the Panasonic relay, and pin 1 is connected to 24V+. Based on the output state of the ULN2003 driver array, it completes the state conversion of one or more Panasonic relays, thus building a test circuit. The logic conversion circuit 11 is connected to the resistance test interface CZ3. By switching the Panasonic relays in the logic conversion circuit, the test interface is connected to the test point of the relay under test. The logic conversion circuit 11 is also connected to the drive power interface CZ5. By switching the Panasonic relays in the logic conversion circuit, the drive of the relay under test is completed. The relay test base connection terminals CZ1-CZ2 are connected to connect each point of the relay under test to the main control circuit.

[0040] The logic conversion control circuit consists of a 74HC595 driver circuit and a ULN2003 driver array, controlling the peripheral circuits. In the 74HC595 driver circuit, pin 9 of the 74HC595 driver chip U3 is connected to pin DS of the 74HC595 driver chip U4, and pin 9 of the 74HC595 driver chip U4 is connected to pin DS of the 74HC595 driver chip U5, forming a cascaded circuit. The main control circuit is connected to pins DS, SH_CP, and ST_CP of the 74HC595 driver chip U3 via pins RA0, RA1, and RA2, and to pins SH_CP and ST_CP of the 74HC595 driver chip U4 via pins RA1 and RA2. The main control circuit is connected to the SH_CP and ST_CP pins of the 74hc595 driver chip U5 via pins RA1 and RA2. By changing the state of pins RA0, RA1, and RA2 of the main control circuit, the output state of the 74hc595 driver circuit is controlled. The output terminal of the 74hc595 driver circuit serves as the input terminal of the ULN2003 driver array. Pin 9 of the ULN2003 chips IC1, IC2, and IC3 in the ULN2003 driver array is connected to terminal CZ4-1, and pin 8 is connected to terminal CZ4-2, converting the 5V voltage signal input to the output pin of the 74hc595 driver circuit into a 24V output signal output from the output terminal of the ULN2003 driver array. The 24V output port of the switching power supply 4 is connected in parallel with the connection terminal CZ4-2 of the main control board 1, the output port COM2 of the switching power supply 4 is connected in parallel with the connection terminal CZ4-1 of the main control board 1, the 5V output port of the switching power supply 4 is connected in parallel with the connection terminal CZ4-4 of the main control board 1, and the output port COM1 of the switching power supply 4 is connected in parallel with the connection terminal CZ4-3 of the main control board 1.

[0041] The vehicle-mounted relay electrical characteristic testing device of the present invention can be integrated into a box. By adopting a portable box structure, vehicle-mounted relays can be tested not only in the maintenance depot, but also on-site. Automatic testing of the electrical characteristics of vehicle-mounted relays is achieved through information interaction and logic control between the industrial control integrated computer and the lower computer, i.e., the main control board 1, which greatly improves the testing efficiency and accuracy of relays in the electrical section.

[0042] This utility model is designed for testing four types of vehicle-mounted relays used in large quantities by electrical depots. It is used to test the electrical characteristics of the relays, including contact resistance, coil resistance, set voltage (pull-in voltage), reset voltage (release voltage), pull-in time, and release time. All tests are automated.

[0043] The four types of vehicle relays that this utility model can test are as follows: Bistable relays: JC-B040, SBMGS-400-110; Monostable relays: JC-A040, AMGS-400-130.

[0044] The positive output port of the DC flow control power supply 7 is connected to the connection terminal CZ5-2 of the main control board 1 in parallel, and the negative output port is connected to the connection terminal CZ5-1 of the main control board 1 in parallel. The DC flow control power supply can simultaneously power the relay to realize the testing of the set voltage (pull-in voltage), reset voltage (release voltage), bounce time, pull-in time, and release time.

[0045] The specific testing method for this utility model is as follows:

[0046] Set voltage (pull-in voltage)

[0047] After receiving the command, the main control board drives a logic conversion control circuit composed of a 74HC595 driver circuit and a ULN2003 driver array through changes in the high and low levels of the microcontroller's output port. The change in the output state of the ULN2003 driver array then drives the logic conversion circuit composed of a Panasonic DS2Y-S-DC24V relay and a high-frequency small-signal diode 1N4148 to switch the test circuit. This connects all the front contacts of the relay connected to the relay base into a series circuit. One terminal of this circuit is connected to the microcontroller's input port, and the other terminal is connected to ground, forming a judgment loop. When all the front contacts of the relay are closed, the signal received by the microcontroller's input port is low (internal state 0); otherwise, it is 1. The microcontroller uses the received signal to determine whether the relay is closed. Simultaneously, the microcontroller also drives the relevant relays through its output port to build a power supply circuit, connecting the output port of the DC flow control power supply to the relay's power supply coil, thus powering the relay under test. Once the circuit switching is complete, the industrial control computer issues a command to control the DC flow control power supply to gradually increase the voltage from 0V and output it. By monitoring the changes in the microcontroller's input port, the state of the relay under test is determined. When the input port state changes from 1 to 0, all front contacts of the relay close and the relay armature closes. The industrial control computer reads the voltage value of the DC voltmeter at this moment through the 485 serial port. This voltage is the relay set voltage (pull-in voltage).

[0048] Reset voltage (release voltage)

[0049] After receiving the command, the main control board drives a logic conversion control circuit composed of a 74HC595 driver circuit and a ULN2003 driver array through the high and low level changes of the microcontroller's output port. The change in the output state of the ULN2003 driver array then drives the logic conversion circuit composed of a Panasonic DS2Y-S-DC24V relay and a high-frequency small-signal diode 1N4148 to switch the test circuit. This connects all the front contacts of the relay connected to the relay base into a parallel circuit. One terminal of this circuit is connected to the microcontroller's input port, and the other terminal is connected to ground, forming a judgment loop. When all the front contacts of the relay are closed, the signal received by the microcontroller's input port is low, and the internal program state is 0; otherwise, it is 1. The microcontroller uses the received signal to determine whether the relay is closed. Simultaneously, the microcontroller also drives the relevant relays through its output port to build a power supply circuit, connecting the output port of the DC flow control power supply to the relay's power supply coil, thus powering the relay under test. After the circuit switching is complete, the industrial control computer sends a command to control the DC current-controlled power supply to gradually increase the voltage from 0V to the magnetization value of the relay under test. At this time, all the front contacts of the relay under test are closed. Then, the output voltage of the DC current-controlled power supply is gradually decreased. The state of the relay under test is determined by monitoring the changes in the state of the microcontroller's input port. When the input port state changes from 0 to 1, all the front contacts of the relay open. The industrial control computer reads the voltage value of the DC voltmeter at this moment through the 485 serial port. This voltage is the relay reset voltage (release voltage).

[0050] Adsorption time

[0051] The circuit that tests the set voltage (pull-in voltage) calculates the time from when the relay starts to be energized by the coil until all the front contacts of the relay are closed, which is the pull-in time.

[0052] Release time

[0053] This is achieved through a circuit that tests the reset voltage (release voltage). The release time is calculated by using the internal clock crystal oscillator of the microcontroller, which measures the time from when the relay coil is de-energized until all the front contacts of the relay are disconnected.

[0054] Test ports 1, 2, 3, and 4 of the ohmmeter are connected to terminals CZ3-3, CZ3-4, CZ3-2, and CZ3-1 on the main control board, respectively. By switching the logic circuit of the lower-level machine, the contacts and coil of the relay under test can be connected to the test ports of the micro-ohmmeter, enabling the testing of contact resistance and coil resistance. The specific method is as follows:

[0055] Contact resistance and coil resistance

[0056] After receiving the instruction, the main control board drives the logic conversion control circuit composed of the 74HC595 driver circuit and the ULN2003 driver array through the high and low level changes of the microcontroller output port. After the output state of the ULN2003 driver array changes, it drives the logic conversion circuit composed of the Panasonic relay DS2Y-S-DC24V and the high-frequency small signal diode 1N4148 to switch the test circuit. The relay can connect the front contact (or coil) of the relay under test to the test port 1, test port 2, test port 3 and test port 4 of the ohmmeter through the contact via a four-wire system. The industrial control computer reads the resistance value of the contact (or coil) measured by the micro ohmmeter through the 485 serial communication.

[0057] In summary, compared with the prior art, this utility model can achieve automatic testing of contact resistance, coil resistance, set voltage (pull-in voltage), reset voltage (release voltage), pull-in time, and release time of vehicle relays without being limited by the site. This improves the accuracy and convenience of test data, greatly shortens the overall test time, and improves test efficiency.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any modifications, alterations, substitutions, and variations made by those skilled in the art to the above embodiments are within the scope of the present invention.

Claims

1. An on-vehicle relay electrical characteristic testing device characterized by comprising: The utility model relates to a relay testing device, including master control board (1), voltage current display table (2), resistance table (3), switching power supply (4), industrial control integrated machine (5), temperature and humidity sensor (6), direct current process control power (7), master control board (1) is connected with industrial control integrated machine (5) through serial ports, master control board (1) is connected with resistance table (3), switching power supply (4), temperature and humidity sensor (6) is connected with switching power supply (4), the G port of voltage current display table (2) is connected in parallel to the negative output port of direct current process control power (7) with the I- port of voltage current display table (2), the V port of voltage current display table (2) is connected in parallel to the I+ port of voltage current display table (2) and is connected to master control board (1), the positive output port of direct current process control power (7) is connected with master control board, the communication positive interface of temperature and humidity sensor (6), the communication port A of direct current process control power (7), the communication port A of voltage current display table (2), resistance table (3) are connected to the RXD port of industrial control integrated machine (5) after parallel connection, the communication negative interface of temperature and humidity sensor (6), the communication port B of direct current process control power (7), the communication port B of voltage current display table (2), resistance table (3) are connected to the TXD port of industrial control integrated machine (5) after parallel connection, industrial control integrated machine (5) is connected with master control board (1) through communication interface DB9, be equipped with the master control board connection terminal for being connected with relay testing base on master control board (1), be equipped with singlechip on master control board (1), and each input pin of singlechip is used to be connected with the series loop and parallel loop of the relay contact of being measured, and each output pin of singlechip is used to be connected with the logic switching control loop of the relay test circuit of being measured.

2. The device for testing electrical characteristics of a vehicle relay according to claim 1, characterized in that: The master control board (1) includes a master control circuit (8), a logic conversion circuit (11), a communication circuit (9), and a logic conversion control circuit (10). The master control circuit (8) is connected with the communication circuit (9), and the communication circuit (9) is connected with a communication interface COM1. The master control circuit (8) is also connected with the logic conversion control circuit (10). The logic conversion control circuit (10) is connected with the logic conversion circuit (11). The logic conversion control circuit (10) is also connected with a switching power supply interface CZ4. The logic conversion circuit (11) is connected with a resistance test interface CZ3, a driving power supply interface CZ5, and relay testing base connection terminals CZ1-CZ2.

3. The device for testing electrical characteristics of a vehicle relay according to claim 2, characterized in that: The master control circuit (8) includes a PIC18 integrated circuit, a crystal oscillator circuit, an address selection circuit, the PIC18 integrated circuit is connected with the crystal oscillator circuit and a starting capacitor through a pin 13 and a pin 14; a pin 27 of the PIC18 integrated circuit is connected in parallel with a pull-up resistor R15 and a jumper terminal JP3, a pin 28 is connected in parallel with a pull-up resistor R14 and a jumper terminal JP4, a pin 29 is connected in parallel with a pull-up resistor R13 and a jumper terminal JP5, and a pin 30 is connected in parallel with a pull-up resistor R12 and a jumper terminal JP6, to form the address selection circuit; a pin 25 and a pin 26 of the PIC18 integrated circuit are connected with a communication circuit (9), and a pin RA0, a pin RA1 and a pin RA2 of the PIC18 integrated circuit are connected with a logic conversion control circuit (10).

4. The device for testing electrical characteristics of a vehicle relay according to claim 2, characterized in that: The communication circuit (9) is composed of a MAX232 communication chip and a peripheral circuit, a pin 11 and a pin 12 of the MAX232 communication chip are connected with the master control circuit (8), and the communication circuit (9) is connected with a pin 2, a pin 3 and a pin 5 of a communication interface DB9 through a pin 13, a pin 14 and a pin 15 of the MAX232 communication chip respectively.

5. The device for testing electrical characteristics of a vehicle relay according to claim 2, characterized in that: The logic conversion circuit (11) is composed of a Panasonic relay DS2Y-S-DC24V and a high-frequency small-signal diode 1N4148, a negative electrode of the diode 1N4148 is connected to a pin 1 of the Panasonic relay, a positive electrode is connected to a pin 16 of the Panasonic relay, an output end of a ULN2003 driving array of the logic conversion control circuit is connected to the pin 16 of the Panasonic relay, the pin 1 is connected to 24V+, and the state conversion of one or more groups of the Panasonic relay is completed according to the output state of the ULN2003 driving array to build a test circuit.

6. The device for testing electrical characteristics of a vehicle relay according to claim 2, characterized in that: The logic conversion control circuit (10) includes a 74hc595 driving circuit and a ULN2003 driving array, the 74hc595 driving circuit includes three driving chips U3, U4 and U5, a pin 9 of the driving chip U3 is connected with a pin DS of the driving chip U4, a pin 9 of the driving chip U4 is connected with a pin DS of the driving chip U5 to form a cascade circuit, a pin DS, a pin SH_CP and a pin ST_CP of the driving chip U3 are connected with the master control circuit (8), a pin SH_CP and a pin ST_CP of the driving chip U4 are connected with the master control circuit (8), and a pin SH_CP and a pin ST_CP of the driving chip U5 are connected with the master control circuit (8); an output end of the 74hc595 driving circuit is connected with an input end of the ULN2003 driving array, and the ULN2003 driving array includes chips IC1, IC2 and IC3, a pin 9 of IC1, IC2 and IC3 is connected with a terminal CZ4-1, and a pin 8 is connected with a terminal CZ4-2.

7. The electrical characteristic testing device for vehicle relay according to claim 1, characterized in that: The 24V output of the switching power supply (4) is connected in parallel with the connection terminal CZ4-2 of the main control board (1), the output COM2 of the switching power supply (4) is connected in parallel with the connection terminal CZ4-1 of the main control board (1), the 5V output of the switching power supply (4) is connected in parallel with the connection terminal CZ4-4 of the main control board (1), and the output COM1 of the switching power supply (4) is connected in parallel with the connection terminal CZ4-3 of the main control board (1).

8. The device according to claim 1, characterized in that: The 24V output of the switching power supply (4) is connected in parallel with the VCC of the temperature and humidity sensor (6), and the output COM2 of the switching power supply (4) is connected in parallel with the GND of the temperature and humidity sensor (6).

9. The device according to claim 1, characterized in that: The device tests the electrical characteristics of the vehicle-mounted relay, including contact resistance, coil resistance, setting voltage, reset voltage, pull-in time, release time, and bounce time.

10. The device according to claim 1, characterized in that: The vehicle-mounted relay includes a bistable relay and a monostable relay, wherein the bistable relay includes JC-B040 and SBMGS-400-110, and the monostable relay includes JC-A040 and AMGS-400-130.

Images