EGR valve test system

Abstract

The EGR valve testing system comprises a tool, an upper computer and a controller, and the tool is used for fixedly installing an EGR valve and installing a detection sensor used for measuring the displacement or angle variation of the EGR valve when the EGR valve is opened at a set position; the upper computer is used for sending a detection starting signal, generating a test fitting curve according to a received detection signal and comparing the test fitting curve with standard data; the control board card is used for receiving a starting signal sent by an upper computer to control the forward and reverse rotation module, the first MOS driving module, the second MOS driving module and the third MOS driving module to act, collecting detection signals of the detection sensor, the Hall sensor and the current collection module and transmitting the detection signals to the upper computer.

Description

Technical Field

[0001] This application relates to the technical field of EGR valves, and specifically to an EGR valve test system. Background Art

[0002] In the engine exhaust gas recirculation system, the EGR valve is mainly used to regulate and control the flow of recirculated exhaust gas. The electric EGR valve controls the opening degree of the valve through an internal DC motor. There are two ways to control the opening degree of the valve, namely axial and rotational. In the axial direction, the motor uses a transmission mechanism to push the valve axially along the valve stem to open the valve, and the opening degree is controlled by controlling the axial displacement of the valve; in the rotational mode, the motor drives the valve to rotate around the valve stem through a transmission mechanism to open the valve, and the opening degree is controlled by controlling the rotation angle of the valve; thereby adjusting the exhaust gas flow, so that the exhaust gas and fresh air are mixed in a certain proportion and then returned to the cylinder for recirculation, in order to reduce the combustion temperature and combustion speed in the cylinder, and reduce the NOX emissions.

[0003] After the electric EGR valve is assembled, it is usually necessary to test each product. However, the existing test devices can only test analog signals, do not have the function of detecting the real-time position of the valve, and cannot test the relationship between the actual current and the valve displacement or angle, nor the test fitting curve of the relationship between the position data output by the Hall sensor on the EGR valve and the actual displacement or angle of the valve. Summary of the Invention

[0004] The purpose of this application is to provide an EGR valve test system to solve the problems in the prior art.

[0005] To achieve the above purpose, this application provides the following technical solution: An EGR valve test system, including:

[0006] A tooling 100 for fixedly installing the EGR valve 300 and installing a detection sensor 200 at a set position for measuring the displacement or angle change when the valve of the EGR valve 300 is opened;

[0007] An upper computer 500 for sending a detection start signal or a duty cycle control signal and generating a test fitting curve according to the received detection signal, and comparing it with the standard data;

[0008] A controller 700, including:

[0009] A forward and reverse module for controlling the forward and reverse rotation of the motor of the EGR valve 300;

[0010] A current acquisition module for acquiring the motor current signal;

[0011] A first MOS drive module for controlling the green light of the alarm lamp 600 to turn on;

[0012] The fourth MOS driving module is used to control the red light of the alarm lamp 600 to turn on;

[0013] The second MOS driving module is used to be electrically connected to the forward and reverse module to drive the motor to rotate forward and reverse at a set rotational speed;

[0014] The third MOS driving module is used to control the cylinder 800 to drive the plug 900 to connect or disconnect from the terminal 400 of the EGR valve 300;

[0015] The digital display voltmeter is used to visually observe the actual voltage value supplied to the motor;

[0016] The power supply module is used to provide direct current with a set voltage;

[0017] And:

[0018] The control board is electrically connected to the host computer 500, and is electrically connected to the forward and reverse module, the current acquisition module, the first MOS driving module, the second MOS driving module, the third MOS driving module, the fourth MOS driving module, the Hall sensor on the EGR valve 300, and the detection sensor 200 through a wiring board. It is used to receive the detection start signal or duty cycle control signal sent by the host computer to control the forward and reverse module, the first MOS driving module, the second MOS driving module, and the third MOS driving module to act, and collect the detection signals of the detection sensor 200, the Hall sensor, and the current acquisition module and transmit them to the host computer 500.

[0019] Further, the power supply module includes:

[0020] The first power supply module is used to provide direct current with an adjustable voltage of 0 - 36V to the motor;

[0021] The third power supply module is used to provide 5V direct current to the digital display voltmeter;

[0022] The fourth power supply module is used to provide 5V direct current to the Hall sensor;

[0023] The second power supply module is used to provide 24V direct current to the third power supply module, the fourth power supply module, the forward and reverse module, and the current acquisition module.

[0024] Further, a signal isolation module is provided between the control board and the first power supply module, and the second power supply module is also used to provide 24V direct current to the signal isolation module.

[0025] Further, the EGR valve test system further includes a signal switching module and an oscilloscope. When the signal output by the Hall sensor is a digital signal, the signal input terminal of the oscilloscope is electrically connected to the output terminal of the Hall sensor. According to whether the signal output by the Hall sensor is a digital signal or an analog signal, the signal switching module is used to switch the electrical connection between the output terminal of the oscilloscope or the output terminal of the Hall sensor and the control board.

[0026] Further, the second power supply module is further configured to provide 24V DC power to the signal switching module.

[0027] The present application further provides an EGR valve automatic test method, which uses the above-mentioned EGR valve test system and includes the following steps:

[0028] S1: Install and fix the EGR valve 300 on the tooling 100, and make the detection sensor 200 linked with the valve.

[0029] S2: Confirm whether the signal output by the Hall sensor of the EGR valve 300 is a digital signal or an analog signal, select the corresponding plug 900 and install it at the output end of the cylinder 800, and operate the signal switching module to make the electrical connection between the control board and the corresponding plug 900.

[0030] S3: Click the "Start Test" button on the operation interface of the upper computer 500 to send a detection start signal to the control board.

[0031] S4: After receiving the detection start signal, the control board outputs a power control signal to the first power supply module. The first power supply provides a target voltage to the EGR valve 300. At the same time, the control board controls the third MOS drive module to output a control signal for extending the cylinder 800, and the cylinder 800 drives the plug 900 to connect with the wiring terminal 400 of the EGR valve 300.

[0032] S5: The upper computer 500 outputs a duty cycle control signal according to the set timing.

[0033] S6: The control board receives the duty cycle control signal and outputs a set pulse signal. The signal passes through the second MOS drive module and the negative pole of the first power supply module to form the negative pole of the power supply of the EGR valve 300. The change in the duty cycle output by the upper computer 500 acts on the negative pole of the EGR valve 300, and the motor of the EGR valve 300 starts to act to open the valve.

[0034] S7: The motor of the EGR valve 300 drives the actuator to open the valve, causing a change in the Hall sensor signal. The control board collects the Hall sensor signal and transmits it to the host computer 500. At the same time, the displacement or angular state change formed by the opening of the valve is collected by the detection sensor 200. The detection sensor 200 outputs the corresponding change amount to the control board, and the control board collects the signal and transmits it to the host computer 500.

[0035] S8: The host computer 500 fits multiple test fitting curves based on the relationship between the uploaded Hall sensor signal and the change in the duty cycle control signal sent by the detection sensor 200 and the host computer 500, and compares them with the standard data for judgment.

[0036] S9: If the result is judged to be qualified, the qualified signal port of the control board will output a high-level signal for 1S, causing the first MOS drive module to trigger and turn on the green light of the alarm light 600. If the test is unqualified, the unqualified signal port of the control board will output a high-level signal for 1S, causing the fourth MOS drive module to trigger and turn on the red light of the alarm light 600.

[0037] Further, in step S4:

[0038] The power control signal output by the control board to the first power module is an adjustable analog signal. The analog signal is transmitted to the first power module after passing through the signal isolation module. The first power module outputs the target voltage to the motor of the EGR valve 300 according to this analog signal. The target voltage is displayed in real time by a digital display voltmeter, and the operator visually confirms whether it is consistent with the set parameters. At the same time, the third power module provides 5V DC power to the digital display voltmeter. The fourth power module provides 5V DC power to the Hall sensor.

[0039] Further, in step S4: The positive output of the first power module passes through the current acquisition module. The current acquisition module collects the current change on the line and transmits it to the control board, and the control board feeds it back to the host computer 500.

[0040] Further, in step S2, when the Hall sensor of the EGR valve 300 outputs a digital signal, an oscilloscope is set on the line between the selected plug 900 and the signal switching module. When the Hall sensor of the EGR valve 300 outputs an analog signal, there is no oscilloscope on the line between the selected plug 900 and the signal switching module.

[0041] Advantages of this application: The EGR valve test system and the automatic EGR valve test method provided by this application adopt a tooling, host computer and controller structure. After the operator installs the EGR valve to be tested on the tooling, the test system can automatically complete the electrical connection with the EGR valve to be tested with one-key operation, apply a voltage load to the EGR valve, control the forward and reverse rotation of the motor, and collect the current signal, the displacement or angle signal of the valve, and the Hall sensor signal of the EGR valve in real time through the current acquisition module, and upload them to the host computer. The software program in the host computer automatically fits the measurement curve of the mutual relationship between the current, the displacement or angle of the valve, and compares it with the standard data to make a judgment, and outputs a control signal for controlling the alarm lamp according to the judgment result to give an obvious pass or fail signal; among them, the voltage output to the EGR is also displayed by a digital display voltmeter. The operator can visually compare it with the set parameters and can also fine-tune the voltage to meet the needs of high-precision detection, realize full-range monitoring, and completely perform detection and judgment by the equipment, reducing the intervention of test personnel, significantly improving the detection accuracy of the EGR valve in the production process, and greatly improving the detection automation degree and detection operation efficiency. Description of the Drawings

[0042] Figure 1 It is a schematic structural diagram of this EGR valve test system;

[0043] Figure 2 It is a partial schematic diagram of the tooling structure of this EGR valve test system;

[0044] Figure 3 It is a schematic diagram of the first power supply module of this EGR valve test system;

[0045] Figure 4 It is a schematic diagram of the second power supply module of this EGR valve test system;

[0046] Figure 5 It is a schematic diagram of the third power supply module of this EGR valve test system;

[0047] Figure 6 It is a schematic diagram of the fourth power supply module of this EGR valve test system;

[0048] Figure 7 It is a schematic diagram of the forward and reverse rotation module of this EGR valve test system;

[0049] Figure 8 It is a schematic diagram of the signal switching module of this EGR valve test system;

[0050] Figure 9 It is a schematic diagram of the signal isolation module of this EGR valve test system;

[0051] Figure 10Schematic diagram of the current acquisition module of this EGR valve test system;

[0052] Figure 11 Schematic diagram of the pin wiring of the wiring board of this EGR valve test system;

[0053] Figure 12 Schematic diagram of the wiring of the MOS drive module of this EGR valve test system;

[0054] Figure 13 Duty cycle fitting curve graph obtained by this EGR valve test system (the horizontal axis is the duty cycle and the vertical axis is the signal);

[0055] Figure 14 Valve displacement fitting curve graph obtained by this EGR valve test system (the horizontal axis is the signal and the vertical axis is the displacement value);

[0056] Figure 15 Response time fitting curve graph obtained by this EGR valve test system;

[0057] Figure 16 Signal angle change fitting curve graph obtained by this EGR valve test system (the horizontal axis is the signal and the vertical axis is the valve rotation angle value). Specific implementation mode

[0058] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0059] Please refer to Figures 1-16 , an EGR valve test system provided by the present application includes: a tooling 100, a host computer 500, and a controller 700;

[0060] The tooling 100 is used to fixedly install the EGR valve 300 and install the detection sensor 200 for measuring the displacement or angular change when the valve of the EGR valve 300 is opened at a set position. Here, a support 101 for installing and fixing the EGR valve 300 is provided on the tooling 100. The support 101 is of a hollow structure. When the EGR valve 300 is installed on the support 101, its valve port end is exposed at the lower end of the support 101. When the valve of the EGR valve is an axially opening structure, the detection sensor 200 uses an infrared distance sensor, which is installed below the support 101 and its infrared emission and receiving ends face the valve to detect the axial displacement of the valve; when the valve of the EGR valve is a rotary structure, the detection sensor 200 uses a rotary encoder, which is installed below the support 101 and is connected to the rotating shaft end of the valve through a coupling, so as to detect the angle turned by the valve in real time when the valve rotates; here, the red wire VCC of the encoder is connected to the 8th pin of the wiring board U5, the black wire of the encoder is connected to the 15th pin of the wiring board U5, the gray wire of the encoder is connected to the 48th pin of the wiring board U5, and the green wire of the encoder is connected to the 42nd pin of the wiring board U5; when using an infrared distance sensor, the 28th pin of the wiring board U5 is connected to the signal end of the infrared sensor.

[0061] The host computer 500 is used to send a detection start signal or a duty cycle control signal and generate a test fitting curve according to the received detection signal, and compare it with the standard data;

[0062] The controller 700 includes: a forward and reverse module U1, a current acquisition module U4, a first MOS drive module JP1, a second MOS drive module JP2, a third MOS drive module JP3, a digital display voltmeter JP4, a power module, and a control board;

[0063] The forward and reverse module U1 is used to control the forward and reverse rotation of the motor of the EGR valve 300;

[0064] The current acquisition module U4 is used to collect the motor current signal;

[0065] The first MOS drive module JP1 is used to control the green light of the alarm lamp 600 to turn on;

[0066] The fourth MOS drive module JP5 is used to control the red light of the alarm lamp 600 to turn on;

[0067] The second MOS drive module JP2 is used to be electrically connected to the forward and reverse module to drive the motor to rotate forward and reverse at a set speed;

[0068] The third MOS drive module JP3 is used to control the cylinder 800 to drive the plug 900 to connect or disconnect from the terminal 400 of the EGR valve 300;

[0069] The digital display voltmeter JP4 is connected to the output terminal of the first power supply module DC1, which is used to visually observe the actual voltage value supplied to the motor, facilitating the operator to visually observe and compare with the set parameters. Here, the model of the digital display voltmeter JP4 is preferably GP3-5135;

[0070] The power supply module is used to provide direct current with a set voltage;

[0071] The control board (not shown) is electrically connected to the host computer 500 and is also electrically connected to the forward and reverse module U1, the current acquisition module U4, the first MOS drive module JP1, the second MOS drive module JP2, the third MOS drive module JP3, the fourth MOS drive module JP5, the Hall sensor on the EGR valve 300, and the detection sensor 200 through the wiring board U5. It is used to receive the detection start signal or the duty cycle control signal sent by the host computer 500 to control the actions of the forward and reverse module U1, the first MOS drive module JP1, the second MOS drive module JP2, and the third MOS drive module JP3, and to collect the detection signals of the detection sensor 200, the Hall sensor, and the current acquisition module U4 and transmit them to the host computer 500. Here, the model of the control board is PCI6024E, and the current acquisition module U4 is a DC current transmitter, preferably with the model HY194-BSI. Other DC current transmitters of the same type can also be used; the wiring board U5 uses a wiring board of the ACC68C model.

[0072] See Figure 3 、 Figure 7 、 Figure 11 and Figure 12, the third pin of the first MOS driver module JP1 is grounded, the first and second pins are respectively connected to the 50th pin and the 16th pin of the wiring board U5, and the fourth pin of the first MOS driver module JP1 is electrically connected to the green light of the alarm lamp 600; the third pin of the fourth MOS driver module JP5 is grounded, the first and second pins are respectively connected to the 50th pin and the 51st pin of the wiring board U5, and the fourth pin of the fourth MOS driver module JP5 is electrically connected to the red light of the alarm lamp 600; the first and second pins of the second MOS driver module JP2 are respectively connected to the 55th pin and the 2nd pin of the wiring board U5, receiving the duty cycle control signal transmitted by the wiring board U5. The third and fourth pins of the second MOS driver module JP2 are respectively connected to the first pin of the first power module DC1 and a set of normally open and normally closed static contacts corresponding to the relay K2 of the forward and reverse module U1. When the positive and negative of the power supply are reversed relative to the positive and negative of the EGR valve 300 motor under the control of the relay K2, the duty cycle control signal can still be superimposed with the motor power supply to control the rotation of the motor; the third pin of the third MOS driver module JP3 is grounded, the fourth pin is electrically connected to the solenoid valve electrical signal of the cylinder 800 to control the action of the cylinder 800, and the first and second pins of the third MOS driver module JP3 are respectively connected to the 50th pin and the 49th pin of the wiring board U5, receiving the control signal transmitted by the control board through the wiring board U5.

[0073] Preferably, the power supply module includes: a first power supply module DC1, a second power supply module DC2, a third power supply module DC3, and a fourth power supply module DC4;

[0074] The first power supply module DC1 is used to provide direct current with an adjustable voltage of 0 - 36V to the motor;

[0075] The second power supply module DC2 is a switching power supply, which is used to provide 24V direct current to the third power supply module, the fourth power supply module, the forward and reverse module, and the current acquisition module;

[0076] See Figure 4 , the fourth and fifth pins of the second power supply module DC2 are respectively connected to the live wire and the neutral wire after being stepped down to 36V by the power transformer, the third pin is grounded, and the second and first pins respectively output direct current of positive 24V and negative 24V;

[0077] The third power supply module DC3 is a switching power supply, which is used to provide 5V direct current to the digital display voltmeter JP4; See Figure 4 、 Figure 5The third power module DC3 adopts L7805 three-terminal voltage regulator integrated circuit chip, whose input end is connected to the second pin of the second power module DC2 to obtain 24V DC power, and the output end outputs 5V voltage and is connected to the first pin of the digital display voltmeter JP4 control module, the second pin of the digital display voltmeter JP4 control module is grounded, the third and fourth pins are respectively electrically connected to the fourth pin and the first pin of the first power module DC1, that is, connected to the positive and negative output terminals of the first power module DC1 to obtain the voltage loaded on the motor, and the fifth and sixth pins of the digital display voltmeter JP4 are connected to the display screen for displaying the voltage value.

[0078] The fourth power module DC4 is a switching power supply, which is used to provide 5V DC power to the Hall sensor. Figure 6 The fourth power module DC4 also adopts the L7805 three-terminal voltage regulator integrated circuit chip structure. Its input terminal is connected to the second pin of the second power module DC2, and its output terminal outputs a 5V voltage and is connected to the power terminal of the Hall sensor.

[0079] Preferably, a signal isolation module U3 is provided between the control board and the first power module, and the second power module is also used to provide 24V DC power to the signal isolation module U3. Here, the signal isolation module U3 adopts a 485 isolation communication module.

[0080] For details, see Figure 3 , Figure 7 , Figure 9 and Figure 11 , the 6th and 7th pins of the first power module DC1 are respectively connected to the live wire and the neutral wire of the 220V power supply, the 5th pin is grounded, the 4th and 1st pins are respectively connected to the 8th pin of the current acquisition module U4 and the 3rd pin of the second MOS driver module JP2, the 2nd and 3rd pins of the first power module DC1 are respectively electrically connected to the 5th and 6th pins of the signal isolation module U3, wherein the 6th pin of the first power module DC1 is also connected to the live wire with a switch S1 and a fuse F1; the 3rd and 4th pins of the signal isolation module U3 are respectively connected to the 21st and 55th pins of the wiring board U5, thereby, the control board sends an adjustable analog power control signal to the first power module DC1 through the 21st and 55th pins of the wiring board U5 through the signal isolation module U3, thereby adjusting the output voltage of the first power module DC1 to supply a set voltage of direct current to the motor, and here, the adjustment of the analog signal can adopt the existing technology;

[0081] The forward and reverse module U1 includes a triode Q1 and a relay K2. The base and emitter of the triode Q1 are electrically connected to the 19th and 18th pins of the terminal block U5 respectively, and the collector is connected to one end of the control coil of the relay K2. The emitter of the triode Q1 is also grounded; the other end of the control coil of the relay coil K2 is connected to the positive 24V terminal of the second power supply module DC2; the two sets of moving contacts of the relay K2 are respectively connected to the positive and negative poles of the motor. In this way, by controlling the on-off of the triode Q1 with the level signal output from the 19th and 18th pins of the terminal block U5, the forward and reverse rotation of the motor can be conveniently controlled.

[0082] Preferably, the EGR valve test system further includes a signal switching module U2 and an oscilloscope SC. When the signal output by the Hall sensor is a digital signal, the signal input terminal of the oscilloscope SC is electrically connected to the output terminal of the Hall sensor. Depending on whether the signal output by the Hall sensor is a digital signal or an analog signal, the signal switching module is used to switch the electrical connection between the output terminal of the oscilloscope SC or the output terminal of the Hall sensor and the control board.

[0083] Preferably, the second power supply module DC2 is also used to provide 24V DC power to the signal switching module U2.

[0084] See Figure 8 , the signal switching module U2 includes a manual switch S2 and a relay K1. One end of the control coil of the relay K1 is grounded and the other end is connected to the 2nd pin of the second power supply module DC2 through the manual switch S2, that is, connected to the positive 24V DC power. When the Hall sensor of the EGR valve 300 is of the type that outputs an analog signal, a stationary contact of the relay K1 is directly connected to the output terminal of the Hall sensor. When the Hall sensor of the EGR valve 300 is of the type that outputs a digital signal, an oscilloscope SC needs to be connected between a stationary contact of the relay K1 and the output terminal of the Hall sensor to decode the digital signal output by the Hall sensor; the moving contact terminal of the relay K1 is electrically connected to the 33rd pin of the terminal block U5. Among them, two plugs 900 can be set. One of the circuits is connected to the oscilloscope SC and the other is not connected, which is convenient for selection during operation, and the circuit is selectively connected through the manual switch S1 and the relay K1, which is convenient for operation.

[0085] See Figure 10 , the 1st pin of the current acquisition module U4 is grounded, the 5th and 11th pins are respectively connected to the 64th and 65th pins of the terminal block U5, the 2nd pin of the current acquisition module U4 is connected to the 2nd pin of the second power supply module DC2, that is, connected to the positive 24V DC power, the 8th pin of the current acquisition module U4 is connected to the 4th pin of the first power supply module DC1, and the 6th pin of the current acquisition module U4 is connected to the other set of normally open and normally closed stationary contacts corresponding to the relay K2 of the forward and reverse module U1.

[0086] The present application also provides an automatic testing method for an EGR valve. Using the EGR valve testing system as described above, it includes the following steps:

[0087] S1: Install and fix the EGR valve 300 onto the tooling 100, and make the detection sensor 200 linked with the valve. There is a support 101 for installing and fixing the EGR valve 300 on the tooling 100. The support 101 is of a hollow structure. When the EGR valve 300 is installed onto the support 101, the valve port end is exposed at the lower end of the support 101. When the valve of the EGR valve is of an axial opening structure, the detection sensor 200 uses an infrared distance sensor, which is installed below the support 101 and its infrared emission and receiving ends face the valve to detect the axial displacement of the valve; when the valve of the EGR valve is of a rotary structure, the detection sensor 200 uses a rotary encoder, which is installed below the support 101 and is connected to the rotating shaft end of the valve through a coupling, so as to detect the angle turned by the valve in real time when the valve rotates; here, the red wire VCC of the encoder is connected to the 8th pin of the wiring board U5, the black wire of the encoder is connected to the 15th pin of the wiring board U5, the gray wire of the encoder is connected to the 48th pin of the wiring board U5, and the green wire of the encoder is connected to the 42nd pin of the wiring board U5; when using an infrared distance sensor, the 28th pin of the wiring board U5 is connected to the signal end of the infrared sensor;

[0088] S2: Confirm whether the output signal of the Hall sensor of the EGR valve 300 is a digital signal or an analog signal, select the corresponding plug 900 and install it at the output end of the cylinder 800, and operate the signal switching module to make the control board electrically connected to the corresponding plug 900;

[0089] S3: Click the "Start Test" button on the operation interface of the host computer 500 to send a detection start signal to the control board;

[0090] S4: After receiving the detection start signal, the control board outputs a power control signal to the first power module. The first power supplies a target voltage to the EGR valve 300. At the same time, the control board controls the third MOS drive module to output a control signal for the cylinder 800 to extend. The cylinder 800 drives the plug 900 to be connected to the terminal 400 of the EGR valve 300 to supply power to the EGR valve 300 and export the Hall sensor signal;

[0091] S5: The host computer 500 outputs a duty cycle control signal according to the set timing;

[0092] S6: The control board receives the duty cycle control signal and outputs a set pulse signal. The signal combines with the negative pole of the first power module through the second MOS driving module to form the negative power pole of the EGR valve 300. The change in the duty cycle output by the host computer 500 acts on the negative pole of the EGR valve 300, and the motor of the EGR valve 300 starts to act to open the valve;

[0093] S7: The motor of the EGR valve 300 drives to perform the valve opening action, causing a change in the Hall sensor signal. The control board collects the Hall sensor signal and transmits it to the host computer 500. At the same time, the change in the displacement or angle state formed by the opening of the valve is collected by the detection sensor 200. The detection sensor 200 outputs the corresponding change amount to the control board, and the control board collects the signal and transmits it to the host computer 500;

[0094] S8: The host computer 500 fits multiple test fitting curves according to the relationship between the uploaded Hall sensor signal, the change in the duty cycle control signal sent by the detection sensor 200 and the host computer 500, and compares and judges with the standard data. As Figures 13 to 16 shown, the EGR valve test system of the present application can fit the duty cycle-signal curve, signal-displacement curve, response time test curve, and signal-angle curve;

[0095] S9: If the result judgment is qualified, the control board will output a 1S high-level signal through the qualified signal port, i.e., the 16th pin of the wiring board U5, to make the first MOS driving module trigger and turn on the green light of the alarm lamp 600; if the test is unqualified, the control board will output a 1S high-level signal through the unqualified signal port, i.e., the 51st pin of the wiring board U5, to make the first MOS driving module trigger and turn on the red light of the alarm lamp 600.

[0096] Among them, in step S4: the power control signal output by the control board to the first power module DC1 is an adjustable analog signal. The analog signal is transmitted to the first power module after passing through the signal isolation module. The first power module outputs the target voltage to the motor of the EGR valve 300 according to this analog signal; the target voltage is displayed in real time by the digital display voltmeter, and the operator visually confirms whether it is consistent with the set parameters; at the same time, the third power module provides 5V DC power to the digital display voltmeter; the fourth power module provides 5V DC power to the Hall sensor.

[0097] Among them, in step S4: the positive output of the first power module passes through the current acquisition module. The current acquisition module collects the current change on the line and transmits it to the control board, and the control board feeds it back to the host computer 500.

[0098] Among them, in step S2, when the Hall sensor output signal of the EGR valve 300 is a digital signal, an oscilloscope SC is provided on the line between the selected plug 900 and the signal switching module; when the Hall sensor output signal of the EGR valve 300 is an analog signal, there is no oscilloscope SC on the line between the selected plug 900 and the signal switching module.

[0099] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0100] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present application.

[0101] At the same time, the content not described in detail in this specification belongs to the prior art well known to those skilled in the art.

[0102] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An EGR valve test system, characterized in that Including: A tooling (100) for fixedly installing the EGR valve (300) and installing a detection sensor (200) for measuring the displacement or angle change when the valve of the EGR valve (300) is opened at a set position; An upper computer (500) for sending a detection start signal or a duty cycle control signal, generating a test fitting curve according to the received detection signal, and comparing it with standard data; A controller (700), including: A forward and reverse rotation module for controlling the forward and reverse rotation of the motor of the EGR valve (300); A current acquisition module for acquiring the motor current signal; A first MOS drive module for controlling the green light of the alarm lamp (600) to turn on; A fourth MOS drive module for controlling the red light of the alarm lamp (600) to turn on; A second MOS drive module for being electrically connected to the forward and reverse rotation module to drive the motor to rotate forward and reverse at a set rotational speed; A third MOS drive module for controlling the cylinder (800) to drive the plug (900) to connect or disconnect from the terminal (400) of the EGR valve (300); A digital display voltmeter for visually observing the actual voltage value supplied to the motor; A power supply module for providing direct current with a set voltage; And: A control board card, electrically connected to the upper computer (500), and electrically connected to the forward and reverse rotation module, the current acquisition module, the first MOS drive module, the second MOS drive module, the third MOS drive module, the fourth MOS drive module, the Hall sensor on the EGR valve (300), and the detection sensor (200) through a wiring board, for receiving the detection start signal or the duty cycle control signal sent by the upper computer to control the actions of the forward and reverse rotation module, the first MOS drive module, the second MOS drive module, and the third MOS drive module, and acquiring the detection signals of the detection sensor (200), the Hall sensor, and the current acquisition module and transmitting them to the upper computer (500).

2. The EGR valve testing system according to claim 1, wherein The power supply module includes: A first power supply module for providing direct current with an adjustable voltage of 0 - 36V to the motor; A third power supply module for providing 5V direct current to the digital display voltmeter; A fourth power supply module for providing 5V direct current to the Hall sensor; A second power supply module for providing 24V direct current to the third power supply module, the fourth power supply module, the forward and reverse rotation module, and the current acquisition module.

3. The EGR valve testing system according to claim 2, characterized in that: A signal isolation module is provided between the control board card and the first power supply module, and the second power supply module is also used to provide 24V direct current to the signal isolation module.

4. The EGR valve testing system according to claim 2, wherein: A signal switching module and an oscilloscope are further included. When the signal output by the Hall sensor is a digital signal, the signal input end of the oscilloscope is electrically connected to the output end of the Hall sensor. According to whether the signal output by the Hall sensor is a digital signal or an analog signal, the signal switching module is used to switch the electrical connection between the output end of the oscilloscope or the output end of the Hall sensor and the control board card.

5. The EGR valve test system according to claim 4, wherein: The second power supply module is also used to provide 24V DC power to the signal switching module.

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