CN112764032A - Vehicle driving danger early warning system and control method thereof - Google Patents
Vehicle driving danger early warning system and control method thereof Download PDFInfo
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- CN112764032A CN112764032A CN201910999043.8A CN201910999043A CN112764032A CN 112764032 A CN112764032 A CN 112764032A CN 201910999043 A CN201910999043 A CN 201910999043A CN 112764032 A CN112764032 A CN 112764032A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003993 interaction Effects 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 230000002452 interceptive effect Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 9
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
- B60Q9/008—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for anti-collision purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- H04B5/72—
Abstract
The invention provides a vehicle driving danger early warning system and a control method thereof, wherein the vehicle driving danger early warning system comprises an MCU chip with a radar signal processing function, a BCM, a power management module and a Zigbee module; the radar module consists of an MCU chip and a radar antenna which are connected by a signal wire; the power management module consists of a DC/DC chip, a power management chip and an LDO (low dropout regulator), and is used for supplying power to each device; the MCU chip is respectively connected with the Zigbee modules through a UART bus and connected with the BCM through a CAN bus; the invention can form a vehicle local area network between the rear vehicles on the same road; when the front vehicle finds the barrier and has a collision dangerous situation, the front vehicle can timely inform the rear vehicle to avoid the barrier in advance so as to prevent the occurrence of the chain rear-end collision accident caused by the fact that the rear vehicle avoids the emergency.
Description
Technical Field
The invention belongs to the field of safe driving of vehicles, and particularly relates to a vehicle driving danger early warning system and a control method thereof.
Background
With the rapid development of electronic technology, in the trend of automobile intellectualization, an intelligent driving assistance system has become an important part. According to incomplete statistics, rear-end collisions in China account for 30% -40% of automobile accidents, wherein one of the main reasons is that the distance between front and rear automobiles is not enough, when the front automobile suddenly stops or changes lanes, the rear automobile cannot react in time to cause rear-end collisions or scraping, and the occurrence of similar accidents causes harm to the personal safety of drivers. On the contrary, according to the report issued by the national highway traffic safety administration of the United states, the collision rate of the Tesla automobile provided with the intelligent driving auxiliary system is reduced by nearly 40%. Therefore, the intelligent auxiliary driving system can effectively improve the driving safety and reduce the accident rate.
Disclosure of Invention
Objects of the invention
The invention provides a vehicle driving danger early warning system and a control method thereof in order to solve the danger in intelligent driving in the prior art.
The technical scheme adopted by the invention
The invention provides a vehicle driving danger early warning system which comprises an MCU chip with a radar signal processing function, a BCM, a power management module and a Zigbee module; the radar module consists of an MCU chip and a radar antenna which are connected by a signal wire; the power management module consists of a DC/DC chip, a power management chip and an LDO (low dropout regulator), and is used for supplying power to each device; the MCU chip is respectively connected with the Zigbee modules through a UART bus and connected with the BCM through a CAN bus;
the MCU chip adopts an AWR1642 chip, the CAN transceiver adopts a TCAN1042 chip, and the Zigbee module adopts a CC2530 chip;
the MCU chip, namely CAN _ FD1_ RX and CAN _ FD1_ TX of the AWR1642 chip are respectively connected with a CAN _ TX pin and a CAN _ RX pin of the CAN transceiver; AW _ RS232_ RX and AW _ RS232_ RX are respectively connected with a UART _ TX pin and a UART _ RX pin of the Zigbee module; m2, K2, H2, F2, B4 and B5 pins are antenna pin groups of the radar module;
a J5 port of the CAN transceiver is connected with a CAN bus end of the BCM, and a CAN _ TX pin and a CAN _ RX pin are respectively connected with CAN _ FD1_ RX and CAN _ FD1_ TX of the MCU; the MCU receives vehicle state information sent by the BCM through the CAN bus;
the UART _ RX pin and the UART _ TX pin of the Zigbee module are connected with the AW _ RS232_ RX pin and the AW _ RS232_ TX pin of the MCU chip and are used for sending and receiving 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., an output end and a receiving end of the interactive information;
the TX1 pin and the TX2 pin of the AWR1642 chip are connected with the transmitting antenna group 20, the RX1 pin to the RX4 pin of the AWR1642 chip are connected with the AWR1642 chip connected with the receiving antenna group 30 to send the millimeter wave modulation signal to the radar antenna, and the radar antenna returns a target echo signal to obtain target position information.
Furthermore, the AWR1642 chip is also connected with the BCM body end through CAN _ FD1_ RX and CAN _ FD1_ TX to feed back the body end information.
Furthermore, the power supply module is composed of a power supply management chip of TI company, wherein the model of the LDO chip is TPS7A52, the model of the DC/DC chip is LM53625, and the buck-boost chip is LP 87702; an external power supply is input at 12V from a J1 port, and 12V voltage is converted into 5V and 3.3V respectively through a DC/DC chip with the model of LM53625 and an LDO chip with the model of LP87702 to supply power for the MCU chip; the VCC _ LDO _ OUT pin of the LDO chip is connected with the pins A2 and B2 of the MCU chip, and the 3.3V voltage end of the power supply module is input to the REST pin of the MCU chip.
The invention provides a vehicle driving danger early warning method.A chip AWR1642 sends a millimeter wave modulation signal to a radar antenna, the radar antenna returns a target echo signal, and the target echo signal is processed by a radio frequency module and a pulse Doppler technology to obtain target position information.
Information interaction is carried out with a BCM body end through CAN _ FD1_ RX and CAN _ FD1_ TX; information interaction is carried out between the AW _ RS232_ RX pin and the AW _ RS232_ TX pin and the Zigbee module;
the method comprises the following steps:
establishing local area network, early warning starting step
When the vehicle speed is larger than the early warning value, the vehicle driving danger early warning system is started, and the Zigbee module searches for a rear vehicle and automatically establishes connection with the rear vehicle to form a local area network; the radar module starts to monitor the condition of the road ahead in real time; meanwhile, the MCU chip receives and processes the pedal braking signal sent by the BCM in real time;
step of judging collision
The MCU chip acquires the distance information of the front obstacle by processing the radar signal, acquires the speed information from the BCM at the same time, and judges whether the vehicle is possibly collided or not by calculation according to the relation between the distance and the speed; if the possibility of collision is judged, the vehicle sends an alarm signal and sends alarm information to the rear vehicle through the Zigbee module;
local area network communication procedure
When the vehicle is emergently braked, alarm information can be sent to the rear vehicle to inform the rear vehicle of avoiding obstacles in advance.
Furthermore, the vehicle speed is more than the early warning value and is 20 km/h.
3. Advantageous effects adopted by the present invention
(1) Although the prior art can remind the rear vehicle, if the double-jump lamp is automatically turned on when a dangerous condition occurs, the rear vehicle cannot observe a double-jump lamp signal due to reasons such as sight lines (fog, heavy rain, shielding of a front vehicle and the like), and when the front vehicle is suddenly stopped or breaks down, the rear-end collision accident caused by avoiding cannot be realized in time. According to the technical scheme, a local area network of the vehicles can be formed among the vehicles within a certain range, when the front vehicle finds a dangerous situation, the front vehicle can be timely informed of avoiding barriers in advance, so that a chain rear-end collision accident caused by the fact that the rear vehicle avoids the barriers urgently can be prevented, and the driving safety is greatly improved.
(2) The MCU chip in the system of the invention receives and processes the pedal brake signal of the BCM in real time, and when the vehicle is braked emergently, the MCU chip can also send alarm information to the rear vehicle to inform the rear vehicle of avoiding obstacles in advance. The radar can not accurately identify due to weather or contamination and the like, the overall alarm accuracy of the system can be effectively improved by processing the pedal brake signal sent by the BCM, and the driving safety is further improved.
Drawings
Fig. 1 is a construction diagram of a vehicle driving danger early warning system.
FIG. 2 is a schematic view of a vehicle driving risk early warning system.
Fig. 3 is a circuit diagram of a power module of a vehicle driving risk early warning system.
Fig. 4 is a circuit diagram of a CAN transceiver of a vehicle driving risk early warning system.
Fig. 5 is a circuit diagram of a Zigbee module of a vehicle driving risk early warning system.
Fig. 6 is a circuit diagram of an MCU chip of the vehicle driving risk early warning system.
Detailed Description
The technical solutions in the examples of the present invention are clearly and completely described below with reference to the drawings in the examples of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
In order to further improve the driving safety and ensure the personal and property safety of the driver, the invention provides a vehicle driving danger early warning system and a control method thereof, wherein the vehicle driving danger early warning system comprises the following steps: MCU chip, BCM, power management module, Zigbee module of radar signal processing function. The radar module consists of an MCU chip and a radar antenna, and the MCU chip and the radar antenna are connected by a signal line; the power management module consists of a DC/DC chip, a power management chip and an LDO (low dropout regulator), and is mainly used for supplying power to devices such as an MCU (microprogrammed control unit) chip and the like. The MCU chip is respectively connected with the Zigbee modules through a UART bus and connected with the BCM through a CAN bus. Preferably, the Zigbee module adopts a CC2530 chip of TI, the CAN transceiver adopts a TCAN1042 of TI, the power module is composed of a power management chip of TI, wherein the model of the LDO chip is TPS7a52, the model of the DC/DC chip is LM53625, and the buck-boost chip is LP 87702.
The MCU chip adopts an AWR1642 chip of TI company capable of processing radar signals, adopts advanced pulse Doppler and continuous wave radar technologies, comprises a radio frequency front end and a data processing module, and has rich peripheral interfaces.
The TX1 pin and the TX2 pin of the AWR1642 chip are connected with the transmitting antenna group 20, the RX1 pin to the RX4 pin of the AWR1642 chip are connected with the AWR1642 chip connected with the receiving antenna group 30 to send the millimeter wave modulation signal to the radar antenna, the radar antenna returns a target echo signal, and the target echo signal is processed through a radio frequency module and a pulse Doppler technology to obtain target position information.
Fig. 3 is a circuit diagram of a power module of a vehicle driving risk early warning system.
An external power supply is input by a port J1 at 12V, and 12V voltage is converted into 5V and 3.3V respectively through a DC/DC chip with the model of LM53625 and an LDO chip with the model of LP87702 to supply power for the MCU chip. The VCC _ LDO _ OUT pin of the LDO chip is connected with the A2 pin and the B2 pin of the MCU chip, and the 3.3V voltage end of the power supply module is input to the R3 pin (REST pin) of the MCU chip.
Fig. 4 is a circuit diagram of a CAN transceiver of a vehicle driving risk early warning system.
The J5 port of the CAN transceiver is connected with the CAN bus end of the BCM, and the CAN _ TX pin and the CAN _ RX pin are respectively connected with the CAN _ FD1_ RX (F14 pin) and the CAN _ FD1_ TX (H14 pin) of the MCU. And the MCU receives the vehicle state information sent by the BCM through the CAN bus so that the control unit CAN analyze and make a decision. In addition, the working state and the fault state of the system can be fed back to the vehicle body end.
Fig. 5 is a circuit diagram of a Zigbee module of a vehicle driving risk early warning system.
And a 15 pin (UART _ RX pin) and a 16 pin (UART _ TX pin) of the Zigbee module are connected with the MCU chip and used for sending and receiving interactive information between the vehicle system and other vehicle systems. In addition, RF _ P and RF _ N of the Zigbee module are antenna pins, i.e., an output terminal and a receiving terminal of the interaction information.
Fig. 6 is a circuit diagram of an MCU chip of the vehicle driving risk early warning system.
An F14 pin (CAN _ FD1_ RX) and an H14 pin (CAN _ FD1_ TX) of the MCU chip, namely the AWR1642 chip are respectively connected with a CAN _ TX pin and a CAN _ RX pin of the CAN transceiver; pin N4 (AW _ RS232_ RX) and pin N5 (AW _ RS232_ RX) are connected to pin 16 (UART _ TX pin) and pin 15 (UART _ RX pin) of the Zigbee module, respectively. The M2, K2, H2, F2, B4 and B5 pins are antenna pin groups of the radar module.
The TX1 pin and the TX2 pin of the AWR1642 chip are connected with the transmitting antenna group 20, the RX1 pin to the RX4 pin of the AWR1642 chip are connected with the AWR1642 chip connected with the receiving antenna group 30 to send the millimeter wave modulation signal to the radar antenna, the radar antenna returns a target echo signal, and the target echo signal is processed through a radio frequency module and a pulse Doppler technology to obtain target position information.
Besides, the AWR1642 chip also carries out information interaction with a BCM body end through CAN _ FD1_ RX and CAN _ FD1_ TX; and information interaction is carried out with the Zigbee module through an AW _ RS232_ RX pin and an AW _ RS232_ TX pin.
The system of the invention can form a local area network of vehicles among vehicles within a certain distance on the same road, and when the front vehicle finds a dangerous situation, the front vehicle can timely inform the rear vehicle to avoid obstacles in advance, so as to prevent the occurrence of the rear-end collision accident caused by the unexpected avoidance of the rear vehicle, thereby greatly improving the driving safety.
1. Starting the vehicle, and electrifying, initializing and self-checking each module;
2. after the self-checking is passed, entering a normal working mode;
3. when the vehicle speed is more than 20km/h, the vehicle driving danger early warning system is started, and the Zigbee module searches for the rear vehicle and automatically establishes connection with the rear vehicle to form a local area network; the radar module starts to monitor the condition of the road ahead in real time; meanwhile, the MCU chip receives and processes the pedal braking signal sent by the BCM in real time;
4. the MCU chip acquires the distance information of the front obstacle by processing the radar signal, acquires the speed information from the BCM and judges whether the vehicle is likely to collide by calculation. If the possibility of collision is judged, the vehicle sends an alarm signal and sends alarm information to the rear vehicle through the Zigbee module;
5. there is a possibility that the radar module may be out of order or inaccurate due to weather or the like. In this case, although the host vehicle does not detect the possibility of collision, when the host vehicle is braked suddenly, a warning message may be sent to the rear vehicle to notify the rear vehicle of early obstacle avoidance, thereby preventing the occurrence of a rear-end collision.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A vehicle driving danger early warning system is characterized in that: the device comprises an MCU chip with a radar signal processing function, a BCM, a power management module and a Zigbee module; the radar module consists of an MCU chip and a radar antenna which are connected by a signal wire; the power management module consists of a DC/DC chip, a power management chip and an LDO (low dropout regulator), and is used for supplying power to each device; the MCU chip is respectively connected with the Zigbee modules through a UART bus and connected with the BCM through a CAN bus;
the MCU chip adopts an AWR1642 chip, the CAN transceiver adopts a TCAN1042 chip, and the Zigbee module adopts a CC2530 chip;
the MCU chip, namely CAN _ FD1_ RX and CAN _ FD1_ TX of the AWR1642 chip are respectively connected with a CAN _ TX pin and a CAN _ RX pin of the CAN transceiver; AW _ RS232_ RX and AW _ RS232_ RX are respectively connected with a UART _ TX pin and a UART _ RX pin of the Zigbee module; m2, K2, H2, F2, B4 and B5 pins are antenna pin groups of the radar module;
a J5 port of the CAN transceiver is connected with a CAN bus end of the BCM, and a CAN _ TX pin and a CAN _ RX pin are respectively connected with CAN _ FD1_ RX and CAN _ FD1_ TX of the MCU; the MCU receives vehicle state information sent by the BCM through the CAN bus;
the UART _ RX pin and the UART _ TX pin of the Zigbee module are connected with the AW _ RS232_ RX pin and the AW _ RS232_ TX pin of the MCU chip and are used for sending and receiving 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., an output end and a receiving end of the interactive information;
the TX1 pin and the TX2 pin of the AWR1642 chip are connected with the transmitting antenna group 20, the RX1 pin to the RX4 pin of the AWR1642 chip are connected with the AWR1642 chip connected with the receiving antenna group 30 to send the millimeter wave modulation signal to the radar antenna, and the radar antenna returns a target echo signal to obtain target position information.
2. The vehicle driving risk early warning system according to claim 1, wherein: the AWR1642 chip is also connected with a BCM body end through CAN _ FD1_ RX and CAN _ FD1_ TX to feed back body end information.
3. The vehicle driving risk early warning system according to claim 1, wherein: the power supply module is composed of a power supply management chip of TI company, wherein the model of the LDO chip is TPS7A52, the model of the DC/DC chip is LM53625, and the buck-boost chip is LP 87702; an external power supply is input at 12V from a J1 port, and 12V voltage is converted into 5V and 3.3V respectively through a DC/DC chip with the model of LM53625 and an LDO chip with the model of LP87702 to supply power for the MCU chip; the VCC _ LDO _ OUT pin of the LDO chip is connected with the pins A2 and B2 of the MCU chip, and the 3.3V voltage end of the power supply module is input to the REST pin of the MCU chip.
4. An early warning method using the vehicle driving danger early warning system of any one of claims 1 to 3, characterized in that an AWR1642 chip sends a millimeter wave modulation signal to a radar antenna, the radar antenna returns a target echo signal, and the target echo signal is processed by a radio frequency module and a pulse Doppler technology to obtain target position information;
information interaction is carried out with a BCM body end through CAN _ FD1_ RX and CAN _ FD1_ TX; information interaction is carried out between the AW _ RS232_ RX pin and the AW _ RS232_ TX pin and the Zigbee module;
the method comprises the following steps:
establishing local area network, early warning starting step
When the vehicle speed is larger than the early warning value, the vehicle driving danger early warning system is started, and the Zigbee module searches for a rear vehicle and automatically establishes connection with the rear vehicle to form a local area network; the radar module starts to monitor the condition of the road ahead in real time; meanwhile, the MCU chip receives and processes the pedal braking signal sent by the BCM in real time;
step of judging collision
The MCU chip acquires the distance information of the front obstacle by processing the radar signal, acquires the speed information from the BCM at the same time, and judges whether the vehicle is possibly collided or not by calculation according to the relation between the distance and the speed; if the possibility of collision is judged, the vehicle sends an alarm signal and sends alarm information to the rear vehicle through the Zigbee module;
local area network communication procedure
When the vehicle is emergently braked, alarm information can be sent to the rear vehicle to inform the rear vehicle of avoiding obstacles in advance.
5. The vehicle driving risk early warning method according to claim 4, characterized in that: the vehicle speed is more than the early warning value and is 20 km/h.
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| CN201910999043.8A CN112764032A (en) | 2019-10-21 | 2019-10-21 | Vehicle driving danger early warning system and control method thereof |
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