Automobile CAN / LIN bus testing device with wireless signal display

Abstract

The utility model discloses an automobile communication bus testing device with a wireless signal display function. The automobile communication bus testing device comprises a host and a signal display, in the host, a probe interface is used for accessing an automobile communication bus through a probe, a detection signal input module is used for switching the type of the accessed automobile communication bus and the connection polarity according to the control of a main control module, and a communication bus signal identification and conversion module is used for identifying an automobile communication bus signal. The wireless signal transmitting module is used for transmitting a wireless signal to the signal display and converting an automobile communication bus signal and a transceiving signal of the main control module; in the signal display, a wireless signal receiving module is used for receiving a wireless signal sent by the host and converting the wireless signal into an electric signal, and a signal display module is used for displaying the state that the host receives an automobile communication bus signal. When the host is used for detecting the communication signal of the automobile bus, the state of the host receiving the communication signal of the automobile bus can be displayed through the signal display, and convenience is brought to a user.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile equipment detection, and specifically relates to a kind of automobile CAN / LIN bus testing device with wireless signal display. BACKGROUND

[0002] In the process of repairing automobile electrical module, the communication line voltage is often normal but cannot communicate. The traditional solution needs to use CAN analyzer connected to computer software to check communication data, which requires higher professional ability of user, and the number of detection and repair equipment is large, occupies large space, and the connection arrangement is complicated and inconvenient to carry.

[0003] Chinese patent CN202322788969.7 proposes a test device for detecting vehicle CAN serial port and LIN serial port performance, which can be connected to communication interface through probe, and CAN signal or LIN signal data communication condition can be observed through display window of the device. The device is separated from man-machine in special scene, and cannot monitor data in real time. For example, when detecting host is connected to automobile electrical module, and user wants to operate control in automobile console, it is difficult to see CAN bus or LIN bus data communication condition in real time, which affects repair efficiency.

[0004] Therefore, a new device is needed to solve the above problems. UTILITY MODEL CONTENT

[0005] To solve the problems in the prior art, the utility model provides a kind of automobile communication bus testing device with wireless signal display, when using host to detect automobile bus communication signal, the state of host receiving automobile communication bus signal can be displayed through signal display, which is convenient for user to use and improves monitoring and diagnosis efficiency.

[0006] The technical scheme adopted by the utility model is as follows:

[0007] A kind of automobile communication bus testing device with wireless signal display, comprising: host and signal display;

[0008] The host includes:

[0009] Probe interface is used to access automobile communication bus through probe;

[0010] Host control module is used to control the signal sending, receiving and display of the host;

[0011] Detection signal input module is connected to the probe interface and host control module, and is used to switch the type of automobile communication bus accessed and the polarity of connection according to the control of the host control module;

[0012] A communication bus signal identification conversion module is connected to the detection signal input module and the main control module, and is used to identify the automobile communication bus signal and convert the automobile communication bus signal and the transceiving signal of the main control module;

[0013] A wireless signal transmitting module is connected to the main control module, and is used to convert the electric signal transmitted by the main control module into a wireless signal and transmit the wireless signal to the signal display;

[0014] The signal display comprises:

[0015] A wireless signal receiving module is used to receive the wireless signal transmitted by the main control module and convert the wireless signal into an electric signal;

[0016] A signal display module is used to display the state of the main control module receiving the automobile communication bus signal;

[0017] A slave module is connected to the wireless signal receiving module and the signal display module, and is used to control the display of the signal display module according to the received wireless signal.

[0018] Further, the main control module, the detection signal input module, the communication bus signal identification conversion module and the wireless signal transmitting module are arranged on a circuit board embedded in the main control module.

[0019] Further, the detection signal input module comprises a first relay, a second relay, a first switch and a second switch, the first normally open end and the second normally closed end of the first relay are connected to the positive end of the probe interface, the second normally open end and the first normally closed end of the first relay are connected to the negative end of the probe interface, the first common end of the first relay is connected to the first common end of the second relay, the second common end of the first relay is connected to the second common end of the second relay, the first normally open end of the second relay is grounded, the second normally open end of the second relay is connected to the LIN bus signal end, the first normally closed end of the second relay is connected to the CAN bus low signal end, and the second normally closed end of the second relay is connected to the CAN bus high signal end; the signal polarity control end of the main control module controls the power supply or power loss of the coil of the first relay through the first switch, and the signal switching control end of the main control module controls the power supply or power loss of the coil of the second relay through the second switch.

[0020] Further, the communication bus signal identification conversion module comprises a CAN signal identification conversion unit and a LIN signal identification conversion unit;

[0021] The CAN signal identification conversion unit is connected with the CAN bus high signal end, the CAN bus low signal end, the CAN bus high signal detection end, the CAN bus low signal detection end, the CAN signal sending end and the CAN signal receiving end of the master control module, is used for detecting the voltage of the CAN bus high signal end and the CAN bus low signal end and transmitting to the master control module, and is used for converting the CAN bus signal and the transceiving signal of the CAN signal of the master control module.

[0022] The LIN signal identification conversion unit is connected with the LIN bus signal end, the LIN bus signal detection end, the LIN bus signal sending end and the LIN bus signal receiving end of the master control module, is used for detecting the voltage of the LIN bus signal end and transmitting to the master control module, and is used for converting the LIN bus signal and the transceiving signal of the LIN signal of the master control module.

[0023] Further, the host further comprises a first power module, the first power module comprises a first battery, a first power switch unit, a first voltage conversion unit for providing 5V power, a second voltage conversion unit for providing 3.3V power and a third voltage conversion unit for providing 12V power, the first battery is connected with the first voltage conversion unit and the third voltage conversion unit through the first power switch unit, the second voltage conversion unit is connected with the first voltage conversion unit, and the first power switch unit is controlled to be turned on or turned off by the first power switch in the first power switch unit and the master control module.

[0024] Further, the host further comprises a key switch and a display screen, and the key switch and the display screen are connected with the master control module.

[0025] Further, the signal display comprises a signal display shell, and the signal display module, the slave control module and the wireless signal receiving module are arranged on the embedded circuit board in the signal display shell.

[0026] Further, the signal display module is an LED lamp, and the LED lamp is controlled to be lighted by the slave control module.

[0027] Further, the signal display further comprises a second power module, the second power module comprises a second battery and a second power switch, the second power switch is arranged in the signal display shell, and the second battery supplies power to the wireless signal receiving module, the signal display module and the slave control module through the second power switch.

[0028] The utility model discloses beneficial effects are:

[0029] The utility model provides a kind of automobile communication bus testing device with wireless signal display, by probe insertion into the interface of automobile communication bus, when there is signal transmission on automobile communication bus, the type and the polarity of the connected automobile communication bus can be switched by detecting signal input module, the signal transmitted on automobile communication bus can be identified by communication bus signal identification conversion module, and the signal transmitted on automobile communication bus is converted into the signal that main control module can receive by signal receiving port;After main control module receives the signal transmitted on automobile communication bus, wireless signal is sent by wireless signal transmitting module, the received wireless signal is converted into electric signal by the wireless signal receiving module of signal display, and is transmitted to slave control module, slave control module controls signal display module to display according to the received signal, to reflect whether host receives the state of automobile communication bus signal. By using the utility model, user can check whether automobile bus communication signal is received in nearby position in automobile maintenance, convenient for the use of user, can improve monitoring diagnosis efficiency, improve maintenance efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the electrical principle block diagram of the utility model a kind of automobile communication bus testing device with wireless signal display embodiment;

[0031] Figure 2 It is the structural schematic diagram of the utility model a kind of automobile communication bus testing device with wireless signal display embodiment;

[0032] Figure 3 It is detecting signal input module circuit principle diagram;

[0033] Figure 4 It is CAN signal identification conversion unit circuit principle diagram;

[0034] Figure 5 It is LIN signal identification conversion unit circuit principle diagram;

[0035] Figure 6 It is the electrical principle block diagram of first power module;

[0036] Figure 7 It is the display state of display screen;

[0037] Figure 8 It is another display state of display screen;

[0038] Figure 9 It is the electrical principle block diagram of first power module.

[0039] In the figure:

[0040] 100 - host, 101 - host housing, 102 - key, 110 - probe interface, 120 - master module, 130 - detection signal input module, 140 - communication bus signal identification conversion module, 141 - CAN signal identification conversion unit, 142 - LIN signal identification conversion unit, 150 - wireless signal transmission module, 160 - first power module, 161 - first battery, 162 - first power switch unit, 163 - first voltage conversion unit, 164 - second voltage conversion unit, 165 - third voltage conversion unit, 170 - key switch, 180 - display screen, 200 - signal display, 210 - wireless signal receiving module, 181 - communication state display mode area, 220 - signal display module, 230 - slave module, 240 - second power module, 241 - second battery, 242 - second power switch. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the 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 of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] The terms "first", "second", "third" in the present application are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship or movement between components in a certain posture (as shown in the drawings); it should be noted that when a component is referred to as "fixed to", "arranged on", "connected to" another component, it can be directly on another component or there can be a middle component. When a component is considered as "connected" to another component, it can be directly connected to another component, or there can be one or more middle components. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes, and are not the only embodiments.

[0043] As Figures 1-7 To solve the problems existing in the prior art, the utility model provides a kind of automobile communication bus testing device embodiment with wireless signal display, when using host to detect automobile bus communication signal, the state of host receiving automobile communication bus signal can be shown by signal display, it is convenient for user's use, and monitoring diagnosis efficiency is improved.

[0044] Specifically, referring toFigure 1 and Figure 2 An embodiment of the automobile communication bus testing device with wireless signal display comprises a host computer 100 and a signal display 200.

[0045] The host computer 100 comprises a probe interface 110, a master control module 120, a detection signal input module 130, a communication bus signal identification conversion module 140 and a wireless signal transmission module 150. The probe interface 110 is used to access the automobile communication bus through a probe. The master control module 120 is used to control the signal transmission, reception and display of the host computer 100. The detection signal input module 130 is connected to the probe interface 110 and the master control module 120, and is used to switch the type of the accessed automobile communication bus and the polarity of the connected probe under the control of the master control module. The communication bus signal identification conversion module 140 is connected to the detection signal input module 130 and the master control module 120, and is used to identify the automobile communication bus signal and convert the automobile communication bus signal into a signal that can be received by the master control module 120. The wireless signal transmission module 150 is connected to the master control module 120, and is used to convert the electrical signal transmitted by the master control module 120 into a wireless signal and transmit the wireless signal to the signal display 200.

[0046] The signal display 200 comprises a wireless signal receiving module 210, a signal display module 220 and a slave control module 230. The wireless signal receiving module 210 is used to receive the wireless signal transmitted by the host computer 100 and convert the wireless signal into an electrical signal. The signal display module 220 is used to display the state of whether the host computer 100 receives the automobile communication bus signal. The slave control module 230 is connected to the wireless signal receiving module 210 and the signal display module 230, and is used to control the display of the signal display module 230 according to the received wireless signal.

[0047] The working principle of the embodiment of the utility model is as follows: after the user accesses the probe in the probe interface 110, the probe is inserted into the interface of the automobile communication bus. When there is signal transmission on the automobile communication bus, the signal will be accessed through the probe interface 110. The detection signal input module 130 switches the type of the accessed automobile communication bus and the polarity of the connected probe under the control of the master control module 120. The communication bus signal identification conversion module 140 identifies the signal transmitted on the automobile communication bus and converts the signal into a signal that can be received by the master control module 120 through the signal receiving port. After receiving the signal transmitted on the automobile communication bus, the master control module 120 transmits the wireless signal through the wireless signal transmission module 150. The wireless signal receiving module 210 of the signal display 200 converts the received wireless signal into an electrical signal and transmits the electrical signal to the slave control module 230. The slave control module 230 controls the signal display module 220 to display according to the received signal, so as to reflect the state of whether the host computer 100 receives the automobile communication bus signal.

[0048] By using the embodiment of the utility model, the user can check whether the automobile bus communication signal is received at any time in the nearby position in the automobile maintenance, the user's use is facilitated, and the maintenance efficiency can be improved.

[0049] It should be noted that, in the specific implementation, the main control module 120 is a microprocessor; the slave control module 230 can be a microprocessor, or a remote control switch decoding chip, for example, the model of the remote control switch decoding chip is RFE272; the wireless signal transmitting module 150 and the wireless signal receiving module 210 are matched, and have the same communication frequency band.

[0050] In some embodiments, referring to Figure 2 , the host 100 includes a host shell 101, the probe interface 110 is arranged on the surface of the host shell 101, and the main control module 120, the detection signal input module 130, the communication bus signal identification conversion module 140 and the wireless signal transmitting module 150 are arranged on the circuit board embedded in the host shell.

[0051] In some embodiments, referring to Figure 3 , the detection signal input module 130 includes a first relay U1, a second relay U2, a first switch Q1 and a second switch Q2, the first normally open end NO1 and the second normally closed end NC2 of the first relay U1 are connected to the positive end P+ of the probe interface, the second normally open end NO2 and the first normally closed end NC1 of the first relay U1 are connected to the negative end P- of the probe interface, the first common end COM1 of the first relay U1 is connected to the first common end COM1 of the second relay U2, the second common end COM2 of the first relay U1 is connected to the second common end COM2 of the second relay U2, the first normally open end NO1 of the second relay U2 is grounded, the second normally open end NO2 of the second relay U2 is connected to the LIN bus signal end LIN, the first normally closed end NC1 of the second relay U2 is connected to the CAN bus low signal end CANL, and the second normally closed end of the second relay U2 is connected to the CAN bus high signal end CANH; the signal polarity control end CANHL of the main control module 120 controls the power supply or power loss of the coil of the first relay U1 through the first switch Q1, and the signal switching control end CAN-LIN of the main control module 120 controls the power supply or power loss of the coil of the second relay U2 through the second switch Q2.

[0052] In a specific implementation, the first switch Q1 and the second switch Q2 are both NMOS tubes, the gate of the first switch Q1 is connected to the signal polarity control end CANHL of the master control module 120, the source is grounded, the resistor R1 is connected between the gate and the source, the drain is connected to the coil of the first relay U1 between the 5V power supply VCC-5V, the cathode of the diode D1 is connected to the 5V power supply VCC-5V, and the anode is connected to the drain of the first switch Q1; the gate of the second switch Q2 is connected to the signal switching control end CAN-LIN of the master control module 120, the source is grounded, the resistor R2 is connected between the gate and the source, the drain is connected to the coil of the second relay U2 between the 5V power supply VCC-5V, the cathode of the diode D2 is connected to the 5V power supply VCC-5V, and the anode is connected to the drain of the second switch Q2.

[0053] The master control module 120 switches the polarity between the two ends of the probe interface by controlling the high and low levels of the signal polarity control end CANHL. When the signal polarity control end CANHL is high, the coil of the first relay U1 is powered, the first common end COM1 is connected to the first normally open end NO1, and the second common end COM2 is connected to the second normally open end NO2. At this time, the positive end P+ of the probe interface is connected to the CAN bus low signal end CANL or the ground end, and the negative end P- of the probe interface is connected to the CAN bus high signal end CANH or the LIN bus signal end LIN. When the signal polarity control end CANHL is low, the coil of the first relay U1 is de-energized, the first common end COM1 is connected to the first normally closed end NC1, and the second common end COM2 is connected to the second normally closed end NC2. At this time, the positive end P+ of the probe interface is connected to the CAN bus high signal end CANH or the LIN bus signal end LIN, and the negative end P- of the probe interface is connected to the CAN bus low signal end CANL or the ground end. After the host computer 100 is powered on, the first relay U1 is controlled by the signal polarity control end CANHL to make continuous state switching until the communication bus signal recognition conversion module 140 detects and recognizes the communication bus signal. The state of the first relay U1 will no longer be switched thereafter.

[0054] The main control module 120 switches the connected automotive communication bus type by controlling the high and low levels of the CAN-LIN control terminal. When the CAN-LIN control terminal is high, the coil of the second relay U2 is energized, the first common terminal COM1 is connected to the first normally open terminal NO1, and the second common terminal COM2 is connected to the second normally open terminal NO2. At this time, the LIN bus signal terminal LIN and the ground terminal are connected to both ends of the probe interface. When the CAN-LIN control terminal is low, the coil of the first relay U1 is de-energized, the first common terminal COM1 is connected to the first normally closed terminal NC1, and the second common terminal COM2 is connected to the second normally closed terminal NC2. At this time, the CAN bus high signal terminal CANH and the CAN bus low signal terminal CANL are connected to both ends of the probe interface. The main control module 120 can switch the connected automotive communication bus type according to the user's selection.

[0055] In some embodiments, see Figure 4 , Figure 5 The communication bus signal identification and conversion module 140 includes a CAN signal identification and conversion unit 141 and a LIN signal identification and conversion unit 142.

[0056] The CAN signal identification and conversion unit 141 is connected to the CAN bus high signal terminal CANH, the CAN bus low signal terminal CANL, and the CAN bus high signal detection terminal CANH_SEN, CAN bus low signal detection terminal CANL_SEN, CAN signal transmitting terminal CAN_TXD, and CAN signal receiving terminal CAN_RXD of the main control module 120. It is used to detect the voltage of the CAN bus high signal terminal CANH and the CAN bus low signal terminal CANL and transmit it to the main control module 120, and to convert the CAN bus signal with the CAN signal transmit / receive signal of the main control module 120.

[0057] The LIN signal identification and conversion unit 142 is connected to the LIN bus signal terminal LIN and the LIN bus signal detection terminal LINSEN, LIN bus signal transmission terminal LIN_RXD and LIN bus signal reception terminal LIN_TXD of the main control module 120. It is used to detect the voltage of the LIN bus signal terminal LIN and transmit it to the main control module 120, and to convert the LIN bus signal and the LIN signal of the main control module into transmit and receive signals.

[0058] See Figure 4In a specific implementation, the CAN signal recognition and conversion unit 141 can include a CAN communication conversion chip U3, a common mode inductor L1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a TVS tube D3, a TVS tube D4, a capacitor C1, and a capacitor C2. The model of the CAN communication conversion chip U3 can be SIT1040. The transmission data input pin TXD of the CAN communication conversion chip U3 is connected to the CAN signal transmission end CAN_TXD of the host module 120, and the reception data output pin of the CAN communication conversion chip U3 is connected to the CAN signal reception end CAN_RXD of the host module 120. The CAN signal high level pin CANH and the CAN signal low level pin CANL of the CAN communication conversion chip U3 are connected to the CAN bus low signal end CANL and the CAN bus high signal end CANH through the common mode inductor L1. The CAN signal low level pin CANL of the CAN communication conversion chip U3 is also connected to the CAN bus low signal detection end CANL_SEN of the host module 120 through voltage division by the resistor R3 and the resistor R4, and is grounded through the TVS tube D3. The CAN signal high level pin CANH of the CAN communication conversion chip U3 is also connected to the CAN bus high signal detection end CANH_SEN of the host module 120 through voltage division by the resistor R5 and the resistor R6, and is grounded through the TVS tube D4. The resistor R7 is connected in parallel between the CAN bus low signal end CANL and the CAN bus high signal end CANH. The CAN bus low signal end CANL is grounded through the capacitor C1, and the CAN bus high signal end CANH is grounded through the capacitor C2.

[0059] The CAN communication conversion chip U3 functions as a signal transmission between the host module 120 and the CAN bus. Through voltage division by the resistor R3 and the resistor R4, and by the resistor R5 and the resistor R6, the host module 120 can collect the voltage of the CAN bus. The common mode inductor L1 functions as signal isolation, the TVS tube D3 and the TVS tube D4 function as overvoltage protection, and the capacitor C1 and the capacitor C2 function as filtering.

[0060] Referring to Figure 5In a specific implementation, the LIN signal identification and conversion unit 142 may include a LIN communication conversion chip U4, resistors R8, R9, and R10, an NMOS transistor Q3, a capacitor C3, and a diode D5. The LIN communication conversion chip U4 may be a SIT1021T. The receiver data output pin RXD of the LIN communication conversion chip U4 is connected to the LIN signal receiving terminal LIN_RXD of the main control module 120, and the transmitter data input pin TXD of the LIN communication conversion chip U4 is connected to the LIN signal transmitting terminal LIN_TXD of the main control module 120. The LIN bus pin LIN of the LIN communication conversion chip U4 is connected to the LIN bus signal terminal LIN. The 12V power supply VCC-12V is connected to the LIN bus signal terminal LIN through diode D5 and resistor R8. The LIN bus signal terminal LIN is connected to the LIN bus signal detection terminal LINSEN of the main control module 120 after being divided by resistors R9 and R10. The connection between resistor R10 and ground is controlled by NMOS transistor Q3. The battery power pin BAT of the LIN communication conversion chip U4 is connected to the 12V power supply VCC-12V and grounded through capacitor C3.

[0061] The LIN communication conversion chip U4 serves as the signal transmission between the main control module 120 and the LIN bus. Through the voltage division of resistors R9 and R10, the main control module 120 can acquire the voltage of the LIN bus. The main control module 120 also controls whether to acquire the voltage of the LIN bus by controlling the on and off of the NMOS transistor Q3.

[0062] In some embodiments, see Figure 1 , Figure 6 The main unit 100 also includes a first power module 160, which includes a first battery 161, a first power switch unit 162, a first voltage conversion unit 163 for providing 5V power, a second voltage conversion unit 164 for providing 3.3V power, and a third voltage conversion unit 165 for providing 12V power. The first battery 161 is connected to the first voltage conversion unit 163 and the third voltage conversion unit 165 through the first power switch unit 162. The second voltage conversion unit 164 is connected to the first voltage conversion unit 163. The first power switch unit 162 is controlled to be turned on or off by its internal first power switch S1 and the main control module 120. The first power switch S1 is triggered by a button 102 located on the main unit housing 101.

[0063] In specific implementation, see Figure 6The first power switch unit 162 further comprises a PMOS tube Q4, an NMOS tube Q5, a resistor R11, a resistor R12, a diode D6, a diode D7 and a capacitor C4. The source of the PMOS tube Q4 is connected to the power output end of the first battery 161, the drain is connected to the power input end of the first voltage conversion unit 163 and the third voltage conversion unit 165, and the gate is connected to the drain of the NMOS tube Q5. The resistor R11 is connected in parallel between the source and the gate of the PMOS tube Q4. The gate of the NMOS tube Q5 is connected to the power control end POW_EN of the host control module 120, the source is grounded, and the resistor R12 is connected in parallel between the gate and the source. The anode of the diode D7 is connected to the drain of the NMOS tube Q5, the cathode of the diode D7 is connected to the cathode of the diode D6 and one end of the first power switch S1, the other end of the first power switch S1 is grounded, the anode of the diode D6 is connected to the power switch state end of the host control module 120 and one end of the capacitor C4, and the other end of the capacitor C4 is grounded. The first power switch S1 can be a touch switch.

[0064] When the user long-presses the power button, the first power switch S1 is turned on, the source of the PMOS tube Q4 is grounded through the diode D7 and the first power switch S1, the PMOS tube Q4 is saturated and turned on, the first battery 161 supplies power to the equipment of the host 100, and then the power control end POW_EN of the equipment host control module 120 is high, so that the NMOS tube Q5 is saturated and turned on, thereby maintaining the on state of the PMOS tube Q4. When the user long-presses the power button again, the first power switch S1 is turned on, the power switch state end of the host control module 120 is set to low, and then the power control end POW_EN of the equipment host control module 120 is low, so that the NMOS tube Q5 is turned off. After the user releases the first power switch S1, the PMOS tube Q4 is turned off, and the host 100 is powered off.

[0065] In some embodiments, referring to Figure 1 and Figure 2 The host 100 further comprises a key switch 170 and a display screen 180, both of which are connected to the host control module 120. The display screen 180 is arranged on the host shell 101, and the key switch 170 is triggered by the key 102 arranged on the host shell 101.

[0066] The key switch 170 is used to receive the instructions of the user, for example, to switch between the CAN bus mode and the LIN bus mode, and to select whether to send the state of the host 100 receiving the automobile communication bus signal to the signal display 200.

[0067] The display screen 180 can be a liquid crystal display screen, which is used to display the working mode, the working state, the received data and the signal baud rate of the host 100, etc.

[0068] In some embodiments, referring toFigure 1 and Figure 2 The signal display 200 comprises a signal display housing 201, a signal display module 220, a slave module 230 and a wireless signal receiving module 210 arranged on a circuit board embedded in the signal display housing 201.

[0069] In some embodiments, the signal display module 220 is an LED lamp, and the LED lamp is controlled to be lighted by the slave module 230.

[0070] In a specific implementation, the LED lamp of the signal display module 220 can be exposed from the display housing 201; the LED lamp can be arranged in multiple different colors to display different states; or the LED lamp can be arranged in a flashing or non-flashing manner to display different states.

[0071] As an example, the user can set the display mode of the LED lamp of the signal display 200 through the key operation of the host 100 to meet different needs of the user. Figure 7 In one setting mode, the communication state display mode area 181 of the display screen 180 displays the "01" character, and the LED lamp of the signal display 200 flashes when there is data communication on the automobile communication bus, and is always on when there is no data communication on the automobile communication bus. Figure 8 In another setting mode, the communication state display mode area 181 of the display screen 180 displays the "10" character, and the LED lamp of the signal display 200 flashes when there is no data communication on the automobile communication bus, and is always on when there is data communication on the automobile communication bus.

[0072] In some embodiments, referring to Figure 9 The signal display 200 further comprises a second power supply module 240, the second power supply module 240 comprising a second battery 241 and a second power supply switch 242, the second power supply switch 242 being arranged on the signal display 200 housing, and the second battery 241 supplying power to the wireless signal receiving module 210, the signal display module 220 and the slave module 230 through the second power supply switch 242.

[0073] In a specific implementation, the second battery 241 can be a button cell, and the second power supply switch 242 can be a toggle switch.

[0074] The utility model is not limited to the above optional implementation, anyone can draw other various forms of products under the enlightenment of the utility model, but no matter make any change in its shape or structure, all technical solutions falling within the scope defined by the claims of the utility model fall within the protection scope of the utility model.

Claims

1. A vehicle communication bus testing device with wireless signal display, characterized by The host and a signal display are included; The host comprises: a probe interface for accessing the automobile communication bus through a probe; a master control module for controlling the signal transmission, reception and display of the host; a detection signal input module connected to the probe interface and the master control module, for switching the type of the accessed automobile communication bus and the connected polarity according to the control of the master control module; a communication bus signal identification and conversion module connected to the detection signal input module and the master control module, for identifying the automobile communication bus signal and converting the automobile communication bus signal and the transceiving signal of the master control module; a wireless signal transmission module connected to the master control module, for converting the electrical signal transmitted by the master control module into a wireless signal and transmitting the wireless signal to the signal display; The signal display comprises: a wireless signal receiving module for receiving the wireless signal transmitted by the host and converting the wireless signal into an electrical signal; a signal display module for displaying the state of the automobile communication bus signal received by the host; a slave control module connected to the wireless signal receiving module and the signal display module, for controlling the display of the signal display module according to the received wireless signal.

2. The automotive communication bus testing device with wireless signal display according to claim 1, characterized in that, The host comprises a host shell, the probe interface is arranged on the host shell, and the master control module, the detection signal input module, the communication bus signal identification and conversion module and the wireless signal transmission module are arranged on a circuit board embedded in the host shell.

3. The automotive communication bus testing device with wireless signal display according to claim 2, characterized in that, The detection signal input module comprises a first relay, a second relay, a first switch and a second switch, the first normally open end and the second normally closed end of the first relay are connected to the positive end of the probe interface, the second normally open end and the first normally closed end of the first relay are connected to the negative end of the probe interface, the first common end of the first relay is connected to the first common end of the second relay, the second common end of the first relay is connected to the second common end of the second relay, the first normally open end of the second relay is grounded, the second normally open end of the second relay is connected to the LIN bus signal end, the first normally closed end of the second relay is connected to the CAN bus low signal end, and the second normally closed end of the second relay is connected to the CAN bus high signal end; the signal polarity control end of the master control module controls the energization or de-energization of the coil of the first relay through the first switch, and the signal switching control end of the master control module controls the energization or de-energization of the coil of the second relay through the second switch.

4. The automotive communication bus testing device with wireless signal display according to claim 3, characterized in that, The communication bus signal identification and conversion module comprises a CAN signal identification and conversion unit and a LIN signal identification and conversion unit; The CAN signal identification and conversion unit is connected to the CAN bus high signal end, the CAN bus low signal end, the CAN bus high signal detection end, the CAN bus low signal detection end, the CAN signal transmission end and the CAN signal reception end of the master control module, for detecting the voltage of the CAN bus high signal end and the CAN bus low signal end and transmitting the voltage to the master control module, and for converting the CAN bus signal and the transceiving signal of the CAN signal of the master control module; The LIN signal recognition conversion unit is connected with the LIN bus signal end, the LIN bus signal detection end, the LIN bus signal transmission end and the LIN bus signal receiving end of the master module, and is used for detecting the voltage of the LIN bus signal end and transmitting the voltage to the master module, and converting the LIN bus signal and the transceiving signal of the LIN signal of the master module.

5. The automotive communication bus testing device with wireless signal display according to claim 2, characterized in that, The host further comprises a first power module, the first power module comprises a first battery, a first power switch unit, a first voltage conversion unit for providing 5V power, a second voltage conversion unit for providing 3.3V power and a third voltage conversion unit for providing 12V power, the first battery is connected with the first voltage conversion unit and the third voltage conversion unit through the first power switch unit, the second voltage conversion unit is connected with the first voltage conversion unit, and the first power switch unit is controlled to be turned on or turned off by the first power switch in the first power switch unit and the master module.

6. The automotive communication bus testing device with wireless signal display according to claim 1, characterized in that, The host further comprises a key switch and a display screen, and the key switch and the display screen are connected with the master module.

7. The automotive communication bus testing device with wireless signal display according to claim 1, characterized in that, The signal display comprises a signal display shell, a signal display module, a slave module and a wireless signal receiving module which are arranged on an embedded circuit board in the signal display shell.

8. The automotive communication bus testing device with wireless signal display according to claim 7, characterized in that, The signal display module is an LED lamp, and the LED lamp is controlled to be lighted by the slave module.

9. The automotive communication bus testing device with wireless signal display according to claim 2, characterized in that, The signal display further comprises a second power module, the second power module comprises a second battery and a second power switch, the second power switch is arranged in the signal display shell, and the second battery supplies power to the wireless signal receiving module, the signal display module and the slave module through the second power switch.

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