Vehicle driving hazard warning system and control method thereof

Abstract

The invention provides a vehicle driving hazard warning system and a control method thereof, an MCU chip with a radar signal processing function, a BCM, a power management module, and a Zigbee module; the radar module is composed of an MCU chip and a radar antenna, which are connected by a signal line; the power management module is composed of a DC / DC chip, a power management chip and an LDO, and is used to supply power to various devices; the MCU chip is respectively connected to the Zigbee module through a UART bus, and is connected to the BCM through a CAN bus; the invention can form a "local area network" of vehicles between rear vehicles on the same road; when the front vehicle finds an obstacle and there is a collision risk, the rear vehicle can be notified in time to avoid the obstacle in advance, so as to prevent a chain rear-end collision accident caused by the rear vehicle's failure to avoid in a hurry.

Description

Technical Field

[0001] The present invention belongs to the field of vehicle safe driving, and in particular relates to a vehicle driving hazard warning system and a control method thereof. Background Art

[0002] With the rapid development of electronic technology, intelligent driving assistance systems have become an important part of the trend of automobile intelligence. One of the main reasons for rear-end collisions is that the distance between the front and rear vehicles is not enough. When the front car stops suddenly or changes lanes, the rear car cannot react in time, resulting in a rear-end collision or scratch. Such accidents endanger the personal safety of the driver. The collision rate of cars equipped with intelligent driving assistance systems has dropped significantly. It can be seen that intelligent assisted driving systems can effectively improve driving safety and reduce the incidence of accidents. Summary of the invention

[0003] Purpose of the invention

[0004] In order to solve the dangers in intelligent driving in the prior art, the present invention proposes a vehicle driving hazard warning system and a control method thereof.

[0005] Technical solution adopted by the present invention

[0006] The present invention proposes a vehicle driving hazard warning system, comprising an MCU chip with radar signal processing function, a BCM, a power management module, and a Zigbee module; the radar module is composed of an MCU chip and a radar antenna, which are connected by a signal line; the power management module is composed of a DC / DC chip, a power management chip and an LDO, and is used to supply power to each device; the MCU chip is respectively connected to the Zigbee module through a UART bus, and is connected to the BCM through a CAN bus;

[0007] The MCU chip uses AWR1642 chip, the CAN transceiver uses TCAN1042, and the Zigbee module uses CC2530 chip;

[0008] The CAN_FD1_RX and CAN_FD1_TX of the MCU chip, i.e. the AWR1642 chip, are connected to the CAN_TX and CAN_RX pins of the CAN transceiver respectively; the AW_RS232_RX and AW_RS232_RX are connected to the UART_TX and UART_RX pins of the Zigbee module respectively; the M2, K2, H2, F2, B4, and B5 pins are the antenna pin group of the radar module;

[0009] The J5 port of the CAN transceiver is connected to the CAN bus terminal of the BCM, and the CAN_TX pin and CAN_RX pin are connected to the CAN_FD1_RX and CAN_FD1_TX of the MCU respectively; the MCU receives the vehicle status information sent by the BCM through the CAN bus;

[0010] The UART_RX and UART_TX pins of the Zigbee module are connected to the AW_RS232_RX and AW_RS232_TX pins of the MCU chip to send and receive interactive information between the vehicle system and other vehicle systems;

[0011] The RF_P and RF_N of the Zigbee module are antenna pins, i.e. the output and receiving ends of the interactive information;

[0012] The TX1 and TX2 pins of the AWR1642 chip are connected to the transmitting antenna group 20, and the RX1 to RX4 pins of the AWR1642 chip are connected to the receiving antenna group 30. The AWR1642 chip sends the millimeter wave modulated signal to the radar antenna, and the radar antenna returns the target echo signal to obtain the target position information.

[0013] Furthermore, the AWR1642 chip also connects to the BCM body side through CAN_FD1_RX and CAN_FD1_TX to feedback body side information.

[0014] Furthermore, the power module is composed of TI's power management chip, of which the LDO chip model is TPS7A52, the DC / DC chip model is LM53625, and the buck-boost chip is LP87702; the external power supply is input from the J1 port with 12V, and the 12V voltage is converted into 5V and 3.3V respectively through the DC / DC chip model LM53625 and the LDO chip model LP87702 to power the MCU chip; the VCC_LDO_OUT pin of the LDO chip is connected to the A2 and B2 pins of the MCU chip, and the 3.3V voltage end of the power module is input to the REST pin of the MCU chip.

[0015] The present invention proposes a vehicle driving hazard warning method. The AWR1642 chip sends a millimeter wave modulated signal to a radar antenna, and the radar antenna returns a target echo signal. The target echo signal is processed by a radio frequency module and pulse Doppler technology to obtain target position information.

[0016] Information is exchanged with the BCM vehicle body through CAN_FD1_RX and CAN_FD1_TX; information is exchanged with the Zigbee module through the AW_RS232_RX and AW_RS232_TX pins;

[0017] The steps include:

[0018] Establishing a local area network and early warning activation steps

[0019] When the vehicle speed is greater than the warning value, the vehicle driving hazard warning system is activated, the Zigbee module searches for the vehicle behind and automatically establishes a connection with it to form a local area network; the radar module starts to monitor the road conditions ahead in real time; at the same time, the MCU chip receives and processes the pedal brake signal sent by the BCM in real time;

[0020] Steps to determine collision

[0021] The MCU chip processes radar signals to obtain information about the distance of the obstacle ahead, and obtains vehicle speed information from the BCM. Based on the relationship between distance and speed, it determines through calculation whether the vehicle is likely to collide. If it is determined that there is a possibility of collision, the vehicle sends an alarm signal and also sends an alarm message to the vehicle behind through the Zigbee module.

[0022] LAN communication steps

[0023] When the vehicle performs emergency braking, it can also send an alarm message to the vehicle behind to notify the vehicle behind to avoid the obstacle in advance.

[0024] Furthermore, the vehicle speed> warning value is 20km / h.

[0025] 3. Beneficial effects of the present invention

[0026] (1) Although the prior art can warn the following vehicle, such as automatically turning on the double-jumping lights when a dangerous situation occurs, the following vehicle may not be able to see the double-jumping light signal due to reasons such as line of sight (fog, heavy rain, obstruction by the front vehicle, etc.). When the front vehicle stops suddenly or breaks down, it still cannot avoid the vehicle in time, resulting in a rear-end collision. The technical solution described in the present invention can form a "local area network" of vehicles within a certain range. When the front vehicle finds a dangerous situation, it can promptly notify the rear vehicle to avoid the obstacle in advance to prevent a chain rear-end collision caused by the rear vehicle's failure to avoid the obstacle in a hurry, greatly improving driving safety.

[0027] (2) The MCU chip in the system of the present invention receives and processes the pedal brake signal of the BCM in real time. When the vehicle brakes suddenly, it can also send an alarm message to the vehicle behind to notify the vehicle behind to avoid the obstacle in advance. The radar may not be able to make accurate identification due to weather or contamination. By processing the pedal brake signal sent by the BCM, the overall alarm accuracy of the system can be effectively improved, further improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 , one A diagram of the architecture of a vehicle driving hazard warning system.

[0029] Figure 2 , one Schematic diagram of the working conditions of a vehicle driving hazard warning system.

[0030] Figure 3 , one A power module circuit diagram of a vehicle driving hazard warning system.

[0031] Figure 4 , one A CAN transceiver circuit diagram of a vehicle driving hazard warning system.

[0032] Figure 5 , one A Zigbee module circuit diagram of a vehicle driving hazard warning system.

[0033] Figure 6 , one MCU chip circuit diagram of a vehicle driving hazard warning system. DETAILED DESCRIPTION

[0034] The following is a clear and complete description of the technical solutions in the examples of the present invention in conjunction with the accompanying drawings in the examples of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present invention.

[0035] The examples of the present invention will be described in further detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] In order to further improve the safety of driving and protect the personal and property safety of the driver, the present invention provides a vehicle driving hazard warning system and a control method thereof, which includes: an MCU chip with radar signal processing function, a BCM, a power management module, and a Zigbee module. Among them, the radar module is composed of an MCU chip and a radar antenna, and the two are connected by a signal line; the power management module is composed of a DC / DC chip, a power management chip and an LDO, and is mainly used to power devices such as the MCU chip. The MCU chip is connected to the Zigbee module through a UART bus and to the BCM through a CAN bus. Preferably, the Zigbee module uses TI's CC2530 chip, the CAN transceiver uses TI's TCAN1042, and the power module is composed of TI's power management chip, wherein the LDO chip model is TPS7A52, the DC / DC chip model is LM53625, and the buck-boost chip is LP87702.

[0038] The MCU chip uses TI's AWR1642 chip that can process radar signals. It adopts advanced pulse Doppler and continuous wave radar technology, includes a RF front-end and data processing module, and has rich peripheral interfaces.

[0039] The TX1 and TX2 pins of the AWR1642 chip are connected to the transmitting antenna group 20, and the RX1 to RX4 pins of the AWR1642 chip are connected to the receiving antenna group 30. The AWR1642 chip sends the millimeter wave modulated signal to the radar antenna, and the radar antenna returns the target echo signal. The target echo signal is processed by the RF module and pulse Doppler technology to obtain the target position information.

[0040] Figure 3 , one A power module circuit diagram of a vehicle driving hazard warning system.

[0041] The external power supply is input from the J1 port at 12V, and the 12V voltage is converted to 5V and 3.3V respectively through the DC / DC chip model LM53625 and the LDO chip model LP87702 to power the MCU chip. The VCC_LDO_OUT pin of the LDO chip is connected to the A2 and B2 pins of the MCU chip, and the 3.3V voltage end of the power module is input to the R3 pin (REST pin) of the MCU chip.

[0042] Figure 4 , one A CAN transceiver circuit diagram of a vehicle driving hazard warning system.

[0043] The J5 port of the CAN transceiver is connected to the CAN bus terminal of the BCM, and the CAN_TX pin and CAN_RX pin are connected to the CAN_FD1_RX (F14 pin) and CAN_FD1_TX (H14 pin) of the MCU respectively. The MCU receives the vehicle status information sent by the BCM through the CAN bus so that the control unit can analyze and make decisions. In addition, it can also feedback the working status and fault status of the system to the vehicle body.

[0044] Figure 5 , one A Zigbee module circuit diagram of a vehicle driving hazard warning system.

[0045] The 15th pin (UART_RX pin) and 16th pin (UART_TX pin) of the Zigbee module are connected to the MCU chip to send and receive interactive information between the vehicle system and other vehicle systems. In addition, the RF_P and RF_N pins of the Zigbee module are antenna pins, i.e., the output and receiving ends of the interactive information.

[0046] Figure 6 , oneMCU chip circuit diagram of a vehicle driving hazard warning system.

[0047] MCU chip, that is, the F14 pin (CAN_FD1_RX) and H14 pin of the AWR1642 chip

[0048] (CAN_FD1_TX) is connected to the CAN_TX pin and CAN_RX pin of the CAN transceiver respectively; N4 pin

[0049] Pins 16 (UART_TX) and 15 (UART_RX) of the Zigbee module are connected to the AW_RS232_RX pins. Pins M2, K2, H2, F2, B4, and B5 are the antenna pins of the radar module.

[0050] The TX1 and TX2 pins of the AWR1642 chip are connected to the transmitting antenna group 20, and the RX1 to RX4 pins of the AWR1642 chip are connected to the receiving antenna group 30. The AWR1642 chip sends the millimeter wave modulated signal to the radar antenna, and the radar antenna returns the target echo signal. The target echo signal is processed by the RF module and pulse Doppler technology to obtain the target position information.

[0051] In addition, the AWR1642 chip also exchanges information with the BCM vehicle body through CAN_FD1_RX and CAN_FD1_TX; and exchanges information with the Zigbee module through the AW_RS232_RX and AW_RS232_TX pins.

[0052] The system of the present invention can form a "local area network" of vehicles within a certain distance on the same road. When the front vehicle finds a dangerous situation, it can promptly notify the rear vehicle to avoid the obstacle in advance to prevent a series of rear-end collisions caused by the rear vehicle's failure to avoid the danger in a timely manner, thereby greatly improving driving safety.

[0053] 1. The vehicle is started, and each module is powered on, initialized, and self-checked;

[0054] 2. After passing the self-test, enter the normal working mode;

[0055] 3. When the vehicle speed is greater than 20km / h, the vehicle driving hazard warning system is activated, the Zigbee module searches for the vehicle behind and automatically establishes a connection with it to form a "local area network"; the radar module begins to monitor the road conditions ahead in real time; at the same time, the MCU chip receives and processes the pedal brake signal sent by the BCM in real time;

[0056] 4. The MCU chip processes the radar signal to obtain the distance information of the obstacle ahead, and obtains the vehicle speed information from the BCM, and determines whether the vehicle is likely to collide through calculation. If it is determined that there is a possibility of collision, the vehicle will send an alarm signal and also send an alarm message to the vehicle behind through the Zigbee module;

[0057] 5. Due to weather and other reasons, the radar module may fail or be inaccurate. In this case, although the vehicle does not detect the possibility of a collision, when the vehicle makes an emergency brake, it can also send an alarm message to the vehicle behind to notify the vehicle behind to avoid obstacles in advance and prevent rear-end collision.

[0058] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A vehicle driving hazard warning system, characterized in that: MCU chip, BCM, power management module, and Zigbee module for radar signal processing; The radar module consists of an MCU chip and a radar antenna, which are connected by a signal line; the power management module consists of a DC / DC chip, a power management chip and an LDO, which are used to power each device; the MCU chip is connected to the Zigbee module through the UART bus and to the BCM through the CAN bus; The MCU chip uses AWR1642 chip, the CAN transceiver uses TCAN1042, and the Zigbee module uses CC2530 chip; The CAN_FD1_RX and CAN_FD1_TX of the MCU chip, i.e. the AWR1642 chip, are connected to the CAN_TX and CAN_RX pins of the CAN transceiver respectively; the AW_RS232_RX and AW_RS232_RX are connected to the UART_TX and UART_RX pins of the Zigbee module respectively; the M2, K2, H2, F2, B4, and B5 pins are the antenna pin group of the radar module; The J5 port of the CAN transceiver is connected to the CAN bus terminal of the BCM, and the CAN_TX pin and CAN_RX pin are connected to the CAN_FD1_RX and CAN_FD1_TX of the MCU respectively; the MCU receives the vehicle status information sent by the BCM through the CAN bus; The UART_RX and UART_TX pins of the Zigbee module are connected to the AW_RS232_RX and AW_RS232_TX pins of the MCU chip to send and receive interactive information between the vehicle system and other vehicle systems; The RF_P and RF_N of the Zigbee module are antenna pins, i.e. the output and receiving ends of the interactive information; The TX1 and TX2 pins of the AWR1642 chip are connected to the transmitting antenna group 20, and the RX1 to RX4 pins of the AWR1642 chip are connected to the receiving antenna group 30. The AWR1642 chip sends the millimeter wave modulated signal to the radar antenna, and the radar antenna returns the target echo signal to obtain the target position information.

2. The vehicle driving hazard warning system according to claim 1, characterized in that: The AWR1642 chip also connects to the BCM body end through CAN_FD1_RX and CAN_FD1_TX to feedback body end information.

3. The vehicle driving hazard warning system according to claim 1, characterized in that: The power module is composed of TI's power management chip, among which the LDO chip model is TPS7A52, the DC / DC chip model is LM53625, and the buck-boost chip is LP87702; the external power supply is input from the J1 port with 12V, and the 12V voltage is converted into 5V and 3.3V respectively through the DC / DC chip model LM53625 and the LDO chip model LP87702 to power the MCU chip; the VCC_LDO_OUT pin of the LDO chip is connected to the A2 and B2 pins of the MCU chip, and the 3.3V voltage end of the power module is input to the REST pin of the MCU chip.

4. A warning method using the vehicle driving hazard warning system according to any one of claims 1 to 3, characterized in that The AWR1642 chip sends the millimeter wave modulated signal to the radar antenna, which returns the target echo signal. The target echo signal is processed by the RF module and pulse Doppler technology to obtain the target position information. Information is exchanged with the BCM vehicle body through CAN_FD1_RX and CAN_FD1_TX; information is exchanged with the Zigbee module through the AW_RS232_RX and AW_RS232_TX pins; The steps include: Establishing a local area network and early warning activation steps When the vehicle speed is greater than the warning value, the vehicle driving hazard warning system is activated, the Zigbee module searches for the vehicle behind and automatically establishes a connection with it to form a local area network; the radar module starts to monitor the road conditions ahead in real time; at the same time, the MCU chip receives and processes the pedal brake signal sent by the BCM in real time; Steps to determine collision The MCU chip processes radar signals to obtain information about the distance of the obstacle ahead, and obtains vehicle speed information from the BCM. Based on the relationship between distance and speed, it determines through calculation whether the vehicle is likely to collide. If it is determined that there is a possibility of collision, the vehicle sends an alarm signal and also sends an alarm message to the vehicle behind through the Zigbee module. LAN communication steps When the vehicle performs emergency braking, an alarm message is also sent to the vehicle behind to notify the vehicle behind to avoid the obstacle in advance.

5. The early warning method according to claim 4, characterized in that: Vehicle speed> warning value is 20km / h.

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