Rapid test equipment for CAN bus of intelligent networked automobile

Abstract

The utility model relates to intelligent networked automobile CAN bus rapid test equipment, which comprises a power supply module, a voltage conversion module, a single-chip microcomputer module, a liquid crystal screen, a red indicating lamp, a green indicating lamp, a buzzer, a common ground wiring port and a DB9 plug interface used for acquiring electric signals of a CAN bus, and is characterized in that the power supply module is connected with the single-chip microcomputer module through the voltage conversion module; the single-chip microcomputer module is connected with a red indicating lamp, a green indicating lamp, a buzzer, a common ground wiring port and the liquid crystal screen at the same time, and the DB9 plugging port is connected with an AD conversion interface of the single-chip microcomputer module. According to the utility model, the detection time of a tester can be quickly shortened, the test result can be more intuitively and accurately given, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to testing equipment, and relates to a quick testing equipment for a CAN bus of an intelligent network-connected vehicle. Background Art

[0002] The rapid development of intelligent connected technology is ushering in a new era for the automotive industry. The integrated application of advanced technologies such as autonomous driving, vehicle networking, and artificial intelligence has significantly enhanced vehicle safety, comfort, and convenience. However, with the continuous advancement of intelligent connected technology, the importance of testing has become increasingly prominent. Testing is a critical step in ensuring the stable operation and functional integrity of intelligent connected systems. It involves comprehensive and meticulous verification of the system's hardware, software, network communications, and overall performance. Only through rigorous testing can potential issues be identified and corrected, ensuring the safe and reliable operation of intelligent connected vehicles in diverse environments. Intelligent connected vehicles integrate numerous advanced technologies, and the CAN bus, as the core network for internal vehicle communications, demands extremely high technical complexity and stability. The CAN bus transmits data between various sensors, controllers, and actuators within the vehicle, ensuring interoperability among various systems. As the functionality of intelligent connected vehicles continues to increase, the volume and complexity of data on the CAN bus are also increasing. Therefore, testing and debugging the CAN bus is a crucial means of ensuring the technical stability and reliability of intelligent connected vehicles.

[0003] There are generally two types of CAN buses in smart connected vehicles: one for the entire vehicle and the other for millimeter-wave sensors. Both types of CAN buses require testing during production, assembly, testing, and maintenance to ensure the normality of the CAN bus electrical signals. The CAN bus is a differential communication signal line consisting of two high-frequency voltage signals, CANH and CANL. When testing the CAN bus, smart connected vehicle testers require tools such as multimeters, oscilloscopes, and CAN analyzers to determine its normality. This requires a high level of skill from the tester and requires considerable time to conduct the test. The measured results must be compared with the normal CAN bus electrical signals before a conclusion can be drawn. Summary of the Invention

[0004] In order to overcome the shortcomings of existing technologies, the utility model provides a smart connected vehicle CAN bus rapid testing device. It is very important to help smart connected vehicle testers directly test the status of the CAN bus. It can not only quickly improve the tester's detection time, but also provide test results more intuitively and accurately, thereby improving detection efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A rapid test device for the CAN bus of an intelligent connected vehicle comprises a power supply module, a voltage conversion module, a single-chip microcomputer module, a liquid crystal display (LCD), a red indicator light, a green indicator light, a buzzer, a common ground wiring port, and a DB9 plug interface for collecting electrical signals from the CAN bus. The power supply module is connected to the single-chip microcomputer module via one voltage conversion module and is simultaneously connected to the LCD screen via another voltage conversion module. The single-chip microcomputer module is simultaneously connected to the red indicator light, the green indicator light, the buzzer, the common ground wiring port, and the LCD screen. The DB9 plug interface is connected to an AD conversion interface of the single-chip microcomputer module.

[0007] Furthermore, the power supply module is used to power the entire device. The power supply is a 6V DC power supply, which is formed by four 1.5V batteries connected in series.

[0008] Furthermore, the voltage conversion module converts the DC 6V voltage into 5V or 3.3V voltage for use by the single-chip microcomputer module and the OLED liquid crystal screen.

[0009] The single-chip microcomputer module adopts the MK60DN512 single-chip microcomputer module to collect the signal voltages of CANH and CANL of the CAN bus, and judge the normal, open circuit and short circuit conditions of the two signal lines of the CAN bus by comparing them with the normal signal voltage, and then control the LCD screen, red indicator light, green indicator light and buzzer to express the status.

[0010] The LCD screen uses an OLED LCD screen, which can display Chinese characters to show normal and specific abnormal reasons; a green indicator light is on when normal, and a red indicator light is on when abnormal; the buzzer is silent under normal circumstances, but sounds an alarm under abnormal circumstances.

[0011] The DB9 plug interface has 9 pins, of which pin 2 is connected to CANL and pin 7 is connected to CANH. The CAN line of the intelligent connected car and this device are connected through the DB9 interface and need to share a common ground.

[0012] The technical concept of this utility model is to develop an intelligent device for CAN bus testing based on NXP's MK60DN512 single-chip microcomputer. The device collects the electrical signals of the CAN bus through the ADC module of the MK60DN512 single-chip microcomputer, compares the collected voltage signals with the standard voltage signals, and then determines whether the CANH and CANL signal lines of the CAN bus are normal or abnormal. When normal, the LCD screen, indicator lights, and buzzer indicate normality; when abnormal, the LCD screen, indicator lights, and buzzer indicate the abnormality and point out the specific abnormality.

[0013] The beneficial effects of the utility model are mainly manifested in that the state of the CAN bus can be quickly detected, and the detection speed and accuracy are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the equipment module of the present utility model.

[0015] Figure 2 This is a working diagram of the equipment of the present utility model. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Reference Figure 1 A rapid test device for the CAN bus of an intelligent connected vehicle includes a MK60 single-chip microcomputer module, a 6V DC power supply, a voltage conversion module LM1117-5V, a voltage conversion module LM1117-3.3V, a red indicator light, a green indicator light, a buzzer, an OLED liquid crystal screen, a DB9 plug interface and a common ground wiring port group. Among them, the 6V DC power supply is converted into 5V voltage by the voltage conversion module LM1117-5V to power the MK60 single-chip microcomputer; the 6V DC power supply is converted into 3.3V voltage by the voltage conversion module LM1117-3.3V to power the OLED liquid crystal screen, and the CANH and CANL two-way voltage signals of the DB9 plug interface are directly transmitted to the AD conversion module of the MK60 single-chip microcomputer; the red indicator light, the green indicator light and the OLED liquid crystal screen are directly controlled by the MK60 single-chip microcomputer; the common ground wiring port is the common ground of this device and the intelligent connected vehicle, providing the same 0V reference voltage.

[0018] Reference Figure 2, connect the CAN bus of the smart connected car to this device through the DB9 plug connector, and connect the common ground wire. After this device starts working, it will first detect the CAN signal of the DB9 interface. If the voltage of the two CAN signal lines CANH and CANL is basically consistent with the standard voltage, it is judged that the CAN communication of the smart connected car is normal, and it will be displayed in Chinese characters on the LCD screen. The green indicator light will be on, the red indicator light will not be on, and the buzzer will not sound. If the voltage of the two CAN signal lines is inconsistent with the standard voltage, then check for open circuit and short circuit respectively. If the voltage of a certain signal line is 0V, it is judged that the signal line is short-circuited to the ground, and it will be displayed on the LCD screen. If the Chinese character is abnormal, the signal line is shorted to ground, a red indicator light is on, and a buzzer sounds. If the voltage of a signal line is not 0V, nor is it normal voltage, and the voltage value does not exceed 0.5V, it means that the MK60 microcontroller ADC module has not collected anything. The signal line is judged to be open circuit, and the LCD screen shows that the signal line is open circuit. The red indicator light is on and the buzzer sounds. If the voltage of both signal lines is not 0V and the voltage of the two signal lines is equal, the two signal lines are judged to be short circuited. The LCD screen shows abnormal short circuit, the red indicator light is on, and the buzzer sounds. At this point, the detection process ends.

[0019] The circuit design for this device was completed in Altium Designer circuit design software. The red and green indicators and buzzer are controlled by the MK60 microcontroller's GPIO functions. Specifically, the red indicator is controlled by the MK60's PTB0 port. When the red indicator is on, PTB0 outputs a 3.3V high level; when it is off, it outputs a 0V low level. The green indicator is controlled by the MK60's PTB1 port. When the green indicator is on, PTB1 outputs a 3.3V high level; when it is off, it outputs a 0V low level. The buzzer is controlled by the MK60's PTB2 port. When the buzzer sounds, PTB2 outputs a 3.3V high level; when it is off, it outputs a 0V low level. The two CANH and CANL signals on the DB9 interface are used by the MK60's ADC0 and ADC1 channels, respectively, for analog data acquisition. The OLED LCD display is controlled by PTC3, PTC5, PTC6, PTC7 and PTC15 of the MK60 microcontroller.

[0020] After the circuit schematic design is completed, the MK60 microcontroller, DB9 plug interface, common ground wiring port, red indicator light, green indicator light, buzzer, OLED liquid crystal display, voltage conversion module LM1117, power supply and other modules are laid out on the PCB circuit board according to the actual size, and then the wiring is carried out according to the connection in the schematic diagram, and the power lines, ground lines and signal lines are connected on the PCB board. Finally, the PCB circuit board design of this device is completed after the circuit board pad tearing and copper cladding.

[0021] After the PCB circuit board of this equipment is manufactured, each module is welded on the PCB board to complete the final design of this equipment. Figure 2 Under the workflow control logic, this device can quickly and accurately complete intelligent connected vehicle CAN bus testing. Compared with traditional testing methods using multimeters, oscilloscopes, and CAN analyzers, the detection speed and accuracy are greatly improved. The method and device for rapid intelligent connected vehicle CAN bus testing provided by this utility model greatly facilitate the work of intelligent connected vehicle testers.

[0022] The embodiments of this specification are merely examples of implementations of the utility model and are provided for illustrative purposes only. The scope of protection of this utility model should not be considered limited to the specific forms described in these embodiments. The scope of protection of this utility model also extends to equivalent technical means that can be conceived by ordinary technicians in this field based on the concept of this utility model.

Claims

1. A rapid test device for the CAN bus of an intelligent connected vehicle, characterized in that: The device includes a power supply module, a voltage conversion module, a single-chip computer module, a liquid crystal display (LCD), a red indicator light, a green indicator light, a buzzer, a common ground wiring port, and a DB9 plug interface for collecting electrical signals from a CAN bus. The power supply module is connected to the single-chip computer module via a voltage conversion module and is simultaneously connected to the LCD via another voltage conversion module. The single-chip computer module is simultaneously connected to the red indicator light, the green indicator light, the buzzer, the common ground wiring port, and the LCD. The DB9 plug interface is connected to the AD conversion interface of the single-chip computer module.

2. A rapid test device for the CAN bus of an intelligent connected vehicle according to claim 1, characterized in that: The power supply module is used to supply power to the entire device. The power supply is a 6V DC power supply formed by four 1.5V batteries connected in series.

3. A rapid test device for the CAN bus of an intelligent connected vehicle according to claim 1 or 2, characterized in that: The voltage conversion module converts the DC 6V voltage into 5V or 3.3V voltage for use by the single chip microcomputer module and the OLED liquid crystal screen.

4. A rapid test device for the CAN bus of an intelligent connected vehicle according to claim 1 or 2, characterized in that: The single-chip microcomputer module adopts the MK60DN512 single-chip microcomputer module to collect the signal voltages of CANH and CANL of the CAN bus, and judge the normal, open circuit and short circuit conditions of the two signal lines of the CAN bus by comparing them with the normal signal voltage, and then control the LCD screen, red indicator light, green indicator light and buzzer to express the status.

5. A rapid test device for CAN bus of intelligent connected vehicles according to claim 1 or 2, characterized in that: The LCD screen uses an OLED LCD screen, which can display Chinese characters to show normal and specific abnormal reasons; a green indicator light is on when normal, and a red indicator light is on when abnormal; the buzzer is silent under normal circumstances, but sounds an alarm under abnormal circumstances.

6. A rapid test device for the CAN bus of an intelligent connected vehicle according to claim 1 or 2, characterized in that: The DB9 plug interface has 9 pins, of which pin 2 is connected to CANL and pin 7 is connected to CANH. The CAN line of the intelligent connected car and this device are connected through the DB9 interface and need to share a common ground.

Images