1. A vehicle turn warning method characterized by comprising:

acquiring a first speed signal of a left wheel of a vehicle and a second speed signal of a right wheel of the vehicle in real time;

comparing the magnitudes of the first speed signal and the second speed signal,

when the first speed signal is continuously detected to be smaller than the second speed signal, determining that the vehicle enters a left-turning state and giving a left-turning alarm;

and when the first speed signal is continuously detected to be larger than the second speed signal, determining that the vehicle enters a right turning state and performing right turning alarm.

2. The vehicle turning warning method according to claim 1, wherein when it is continuously detected that the first speed signal is less than the second speed signal, it is determined that the vehicle enters a left-turning state and a left-turning warning is performed, specifically:

when the first speed signal is less than the second speed signal after A times of continuous detection, determining that the vehicle enters a left-turning state and giving a left-turning alarm;

or when the first speed signal is continuously detected to be smaller than the second speed signal and the first difference value between the first speed signal and the second speed signal is smaller than a first threshold value, determining that the vehicle enters a left-turn state and giving a left-turn alarm;

or when X times of first speed signals are continuously detected to be smaller than second speed signals and Y times of first difference values of the first speed signals and the second speed signals are detected to be smaller than a first threshold value, determining that the vehicle enters a left-turning state and giving a left-turning alarm; wherein X is greater than or equal to Y and Y is greater than the second threshold.

3. The vehicle turning warning method according to claim 1, wherein when it is continuously detected that the first speed signal is greater than the second speed signal, it is determined that the vehicle enters a right turning state and a right turning warning is performed, specifically:

when the first speed signal is greater than the second speed signal after B times of continuous detection, determining that the vehicle enters a right turning state and giving a right turning alarm;

or when the first speed signal is continuously detected to be greater than the second speed signal and the second difference value of the first speed signal and the second speed signal is greater than a third threshold value, determining that the vehicle enters a right turning state and giving a right turning alarm;

or when M times of continuous detection that the first speed signal is greater than the second speed signal and N times of detection that a second difference value between the first speed signal and the second speed signal is greater than a third threshold value are continuously detected, determining that the vehicle enters a right turning state and performing right turning alarm, wherein M is greater than or equal to N and N is greater than a fourth threshold value.

4. The vehicle turn warning method according to claim 1, wherein after determining that the vehicle enters the left turn state, the vehicle turn warning method further includes:

when the first difference value is continuously detected to be larger than the fifth threshold value, determining that the vehicle exits from the left turning state and stopping the left turning alarm;

or when the first difference value is larger than the fifth threshold value for Z times continuously detected, determining that the vehicle exits the left-turning state and stopping the left-turning alarm.

5. The vehicle turn warning method according to claim 1, wherein after determining that the vehicle enters the right turn state, the vehicle turn warning method further includes:

when the second difference value is continuously detected to be smaller than the sixth threshold value, determining that the vehicle exits the right turning state and stopping the right turning alarm;

or when the second difference value is less than the sixth threshold value for Q times continuously detected, determining that the vehicle exits the right turning state and stopping the right turning alarm.

6. The vehicle turning warning method according to any one of claims 1 to 5, wherein the first speed signal is one of a rotation speed of a left wheel of the vehicle and a first CAN message sent by an ABS controller; the second speed signal and the first speed signal are the same type of speed signals, and the second speed signal is one of the rotating speed of the right wheel of the vehicle and a second CAN message sent by the ABS controller.

7. The vehicle turning alarm method according to claim 6, wherein the ABS controller is configured to receive a first wheel speed signal generated by a left wheel speed sensor of the ABS steering axle and a second wheel speed signal generated by a right wheel speed sensor of the ABS steering axle, convert the received first wheel speed signal and the received second wheel speed signal into a first CAN message and a second CAN message, and send the first CAN message and the second CAN message to the vehicle turning alarm, and the vehicle turning alarm is configured to compare the sizes of the first CAN message and the second CAN message or compare the first CAN message and the second CAN message after respectively converting the sizes of the first CAN message and the second CAN message into the rotating speed of the left wheel and the rotating speed of the right wheel.

8. The vehicle turning warning device is characterized by comprising a first obtaining module and a first comparing module;

the first acquisition module is used for acquiring a first speed signal of a left wheel of the vehicle and a second speed signal of a right wheel of the vehicle in real time;

the first comparison module is used for comparing the magnitude of the first speed signal with the magnitude of the second speed signal, and when the first speed signal is continuously detected to be smaller than the second speed signal, the vehicle is determined to enter a left-turn state and a left-turn alarm is carried out; and when the first speed signal is continuously detected to be larger than the second speed signal, determining that the vehicle enters a right turning state and performing right turning alarm.

9. A vehicle turning alarm system is characterized by comprising a vehicle turning alarm device, an ABS controller, a steering axle left wheel speed sensor and a steering axle right wheel speed sensor;

the ABS controller is used for receiving a first wheel speed signal and a second wheel speed signal sent by a steering axle left wheel speed sensor and a steering axle right wheel speed sensor, converting the first wheel speed signal and the second wheel speed signal into a first CAN message and a second CAN message, and sending the first CAN message and the second CAN message to a vehicle turning alarm;

the vehicle turn warning device is configured to compare a first CAN message and a second CAN message received according to the vehicle turn warning method according to any one of claims 1 to 7, and perform a vehicle turn warning according to a comparison result, wherein the first CAN message is a first speed signal, and the second CAN message is a second speed signal.

Background

At present, the alarm control strategy of the vehicle turning alarm basically adopts the strategy that the alarm detects the input of a left steering lamp switch and a right steering lamp switch or the input of a steering wheel steering angle sensor, and then the alarm is given out through logic judgment. The strategy for detecting the input of the left and right steering lamp switches is adopted, so that the alarm cannot give an alarm correctly because of the non-civilized driving behavior of a driver (the steering lamp switch is not turned on when the vehicle turns right/left), particularly, pedestrians/vehicles in a right turning blind area of the vehicle cannot be effectively reminded when the vehicle turns right, and great potential safety hazards of road traffic exist; the strategy of adopting the corner input of the steering wheel corner sensor requires that the vehicle is provided with the corner sensor, most of trucks are not directly provided with the corner sensor due to cost, and the strategy scheme has high cost and cannot be comprehensively popularized and implemented.

Therefore, in order to solve the problems that the alarm cannot be correctly given and the steering wheel angle sensor is high in cost due to the fact that the operation of a driver is not standard, the input or judgment basis of the vehicle turning alarm needs to be improved and innovated, and therefore the problem of the vehicle turning alarm is solved.

After the input and judgment basis of the vehicle turning alarm is changed, a complete judgment strategy is still lacked in the prior art, the complex turning situation in the actual vehicle running process cannot be coped with, frequent reminding or wrong reminding is generated, so that wrong decisions are made for the following vehicles behind, and great potential safety hazards are generated.

In conclusion, a vehicle turning alarm method, a vehicle turning alarm device and a vehicle turning alarm system which are low in cost, easy to popularize, free of influence of wrong operation of a driver when a decision is made according to actual turning of a vehicle, and capable of adapting to complex turning conditions are needed, and the vehicle turning alarm requirement is met.

Disclosure of Invention

The purpose of the invention is: the vehicle turning alarming method, the device and the system are low in cost and easy to popularize, decision making is carried out according to actual turning of the vehicle, the decision making is not influenced by misoperation of a driver, and the vehicle turning alarming method, the device and the system can adapt to complex turning conditions, so that the vehicle turning alarming requirement is met.

In order to achieve the above object, the present invention provides a vehicle turning warning method including:

and acquiring a first speed signal of a left wheel of the vehicle and a second speed signal of a right wheel of the vehicle in real time.

Comparing the magnitude of the first speed signal with the magnitude of the second speed signal, and determining that the vehicle enters a left-turning state and giving a left-turning alarm when the first speed signal is continuously detected to be smaller than the second speed signal; and when the first speed signal is continuously detected to be larger than the second speed signal, determining that the vehicle enters a right turning state and performing right turning alarm.

Further, when it is continuously detected that the first speed signal is smaller than the second speed signal, it is determined that the vehicle enters a left turn state and a left turn alarm is performed, specifically:

and when the first speed signal is less than the second speed signal after X times of continuous detection, determining that the vehicle enters a left-turning state and giving a left-turning alarm.

Or when the first speed signal is continuously detected to be smaller than the second speed signal and the first difference value of the first speed signal and the second speed signal is smaller than the first threshold value, determining that the vehicle enters a left-turning state and performing a left-turning alarm.

Or when A times of first speed signals are continuously detected to be smaller than second speed signals and Y times of first difference values of the first speed signals and the second speed signals are detected to be smaller than a first threshold value, determining that the vehicle enters a left-turning state and giving a left-turning alarm; wherein X is greater than or equal to Y and Y is greater than the second threshold.

Further, when it is continuously detected that the first speed signal is greater than the second speed signal, it is determined that the vehicle enters a right turn state and a right turn alarm is performed, specifically:

and when the first speed signal is greater than the second speed signal after B times of continuous detection, determining that the vehicle enters a right turning state and giving a right turning alarm.

Or when the first speed signal is continuously detected to be larger than the second speed signal and the second difference value of the first speed signal and the second speed signal is larger than a third threshold value, determining that the vehicle enters a right turning state and giving a right turning alarm.

Or when M times of continuous detection that the first speed signal is greater than the second speed signal and N times of detection that a second difference value between the first speed signal and the second speed signal is greater than a third threshold value are continuously detected, determining that the vehicle enters a right turning state and performing right turning alarm, wherein M is greater than or equal to N and N is greater than a fourth threshold value.

Further, after determining that the vehicle enters the left-turn state, the vehicle turn warning method further includes:

and when the first difference value is continuously detected to be larger than the fifth threshold value, determining that the vehicle exits the left-turning state and stopping the left-turning alarm.

Or when the first difference value is larger than the fifth threshold value for Z times continuously detected, determining that the vehicle exits the left-turning state and stopping the left-turning alarm.

Further, after determining that the vehicle enters the right turn state, the vehicle turn warning method further includes: and when the second difference value is continuously detected to be smaller than the sixth threshold value, determining that the vehicle exits the right turning state and stopping the right turning alarm.

Or when the second difference value is less than the sixth threshold value for Q times continuously detected, determining that the vehicle exits the right turning state and stopping the right turning alarm.

Further, the first speed signal is one of the rotating speed of the left wheel of the vehicle and a first CAN message sent by an ABS controller; the second speed signal and the first speed signal are the same type of speed signals, and the second speed signal is one of the rotating speed of the right wheel of the vehicle and a second CAN message sent by the ABS controller.

Furthermore, the ABS controller is used for receiving a first wheel speed signal generated by the ABS steering axle left wheel speed sensor and a second wheel speed signal generated by the ABS steering axle right wheel speed sensor, converting the received first wheel speed signal and the received second wheel speed signal into a first CAN message and a second CAN message and then sending the first CAN message and the second CAN message to the vehicle turning alarm, and the vehicle turning alarm is used for comparing the sizes of the first CAN message and the second CAN message or comparing the first CAN message and the second CAN message after respectively converting the first CAN message and the second CAN message into the rotating speed of the left wheel and the rotating speed of the right wheel.

The invention also discloses a vehicle turning alarm device which comprises a first obtaining module and a first comparing module.

The first obtaining module is used for obtaining a first speed signal of a left wheel of the vehicle and a second speed signal of a right wheel of the vehicle in real time.

The first comparison module is used for comparing the magnitude of the first speed signal with the magnitude of the second speed signal, and when the first speed signal is continuously detected to be smaller than the second speed signal, the vehicle is determined to enter a left-turn state and a left-turn alarm is carried out; and when the first speed signal is continuously detected to be larger than the second speed signal, determining that the vehicle enters a right turning state and performing right turning alarm.

The invention also discloses a vehicle turning alarm system which comprises a vehicle turning alarm device, an ABS controller, a steering axle left wheel speed sensor and a steering axle right wheel speed sensor.

The ABS controller is used for receiving a first wheel speed signal and a second wheel speed signal sent by a left wheel speed sensor and a right wheel speed sensor of a steering axle, converting the first wheel speed signal and the second wheel speed signal into a first CAN message and a second CAN message, and sending the first CAN message and the second CAN message to the vehicle turning alarm.

The vehicle turning alarm device is used for comparing a received first CAN message with a received second CAN message according to the vehicle turning alarm method, and carrying out vehicle turning alarm according to a comparison result, wherein the first CAN message is a first speed signal, and the second CAN message is a second speed signal.

Compared with the prior art, the vehicle turning alarm method, the vehicle turning alarm device and the vehicle turning alarm system have the beneficial effects that: directly acquiring a first speed signal of a left wheel of the vehicle and a second speed signal of a right wheel of the vehicle as a logic decision basis of turning alarm, so that dependence of turning alarm on the driving state of a driver according to whether a steering lamp of the driver is turned on or not is avoided; meanwhile, the first speed signal and the second speed signal are adopted, a steering wheel corner sensor does not need to be additionally arranged, and the cost is low and the popularization is easy; the decision is made according to the size of the first speed signal and the second speed signal in a continuous range, so that the warning of turning warning is more accurate, and the potential safety hazard caused by wrong warning for the following vehicle when the driver finely adjusts the direction is avoided.

Drawings

FIG. 1 is a schematic flow chart of a vehicle turn warning method of the present invention;

FIG. 2 is a schematic view of a vehicle turn warning device according to the present invention;

FIG. 3 is a schematic diagram of a vehicle turn warning system according to the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1:

referring to the attached figure 1, the invention discloses a vehicle turning alarm method, which is applied to the alarm during the turning of a vehicle and mainly comprises the following steps:

and step S1, acquiring a first speed signal of the left wheel of the vehicle and a second speed signal of the right wheel of the vehicle in real time.

Step S2, comparing the first speed signal and the second speed signal, when the first speed signal is detected to be less than the second speed signal continuously, determining that the vehicle enters a left-turn state and giving a left-turn alarm; and when the first speed signal is continuously detected to be larger than the second speed signal, determining that the vehicle enters a right turning state and performing right turning alarm.

In step S1, the first speed signal is one of a rotation speed of a left wheel of the vehicle and a first CAN message sent by the ABS controller; the second speed signal and the first speed signal are the same type of speed signals, and the second speed signal is one of the rotating speed of the right wheel of the vehicle and a second CAN message sent by the ABS controller.

In an embodiment of the present invention, the ABS controller is configured to receive a first wheel speed signal generated by an ABS steering axle left wheel speed sensor and a second wheel speed signal generated by an ABS steering axle right wheel speed sensor, convert the received first wheel speed signal and the received second wheel speed signal into a first CAN message and a second CAN message, and send the first CAN message and the second CAN message to the vehicle turn alarm, and the vehicle turn alarm is configured to compare sizes of the first CAN message and the second CAN message or convert the first CAN message and the second CAN message into a rotating speed of a left wheel and a rotating speed of a right wheel respectively and compare the rotating speeds.

In step S1, the skilled person can specifically select the first speed signal and the second speed signal as other measurable data related to the left wheel or the right wheel of the vehicle according to the technical solution disclosed in the present invention, as long as the related data contains comparable wheel speed characteristics of the vehicle. Therefore, the disclosed CAN message and wheel speed in this embodiment are the preferred technical solutions, and the ABS controller commonly existing in the existing vehicle is utilized, and the ABS controller constantly detects the wheel speed signals of the ABS steering axle left wheel speed sensor and the ABS steering axle right wheel speed sensor, and converts the "steering axle left wheel relative wheel speed" signal and the "steering axle right wheel relative wheel speed" signal into the CAN message according to the 1939 protocol.

In this embodiment, since the CAN packet is a binary packet, which is not beneficial to the description of the technical solution, in order to make the social public understand and use the technical solution better, the binary packet is converted into a decimal value for explaining the technical solution of the present invention, and the binary system of the packet cannot be used as the technical feature for limiting the present invention.

In step S2, when it is continuously detected that the first speed signal is smaller than the second speed signal, it is determined that the vehicle enters a left turn state and a left turn warning is performed, specifically:

and when the first speed signal is less than the second speed signal after A times of continuous detection, determining that the vehicle enters a left-turning state and giving a left-turning alarm.

Or when the first speed signal is continuously detected to be smaller than the second speed signal and the first difference value of the first speed signal and the second speed signal is smaller than the first threshold value, determining that the vehicle enters a left-turning state and performing a left-turning alarm.

Or when X times of first speed signals are continuously detected to be smaller than second speed signals and Y times of first difference values of the first speed signals and the second speed signals are detected to be smaller than a first threshold value, determining that the vehicle enters a left-turning state and giving a left-turning alarm; wherein X is greater than or equal to Y and Y is greater than the second threshold.

By continuously detecting the times that the first speed signal is smaller than the second speed signal, unnecessary alarm signals sent by operations such as vehicle fine adjustment, direction correction and the like can be avoided, and the alarm precision is improved; whether the vehicle enters a turning state and the speed of entering the turning state (the speed of turning) can be more accurately judged by detecting the first difference value, so that whether the speed exceeds the range set by the threshold value is determined, and a turning alarm is given when the condition is met; through the number of times of detecting first difference, increased the further screening to getting into turn alarm state, made the warning more accurate, the driving state of laminating reality more.

In this embodiment, the values of the first threshold, the second threshold and A, X, Y may be selected according to actual vehicle model, vehicle speed and other factors, where the vehicle model includes vehicle length, vehicle width and tire size. According to the technical scheme of the application, reasonable values can be obtained through limited tests by a person skilled in the art, and whether the values are the same or not, the reasonable values are within the technical scheme disclosed by the invention.

In the present embodiment, some possible modes are given, such as determining that the vehicle enters a left-turn state and performing a left-turn warning when the first speed signal is less than the second speed signal is continuously detected for 10 times; when 10 times of continuous detection that the first speed signal is smaller than the second speed signal and 8 times of detection that the first difference value between the first speed signal and the second speed signal is smaller than negative 7 (first threshold), the second threshold can be set to 7, and it is determined that the vehicle enters a left-turn state and a left-turn warning is performed.

In step S2, when it is continuously detected that the first speed signal is greater than the second speed signal, it is determined that the vehicle enters the right turn state and a right turn warning is performed, specifically:

when the first speed signal is greater than the second speed signal after B times of continuous detection, determining that the vehicle enters a right turning state and giving a right turning alarm;

or when the first speed signal is continuously detected to be greater than the second speed signal and the second difference value of the first speed signal and the second speed signal is greater than a third threshold value, determining that the vehicle enters a right turning state and giving a right turning alarm;

or when M times of continuous detection that the first speed signal is greater than the second speed signal and N times of detection that a second difference value between the first speed signal and the second speed signal is greater than a third threshold value are continuously detected, determining that the vehicle enters a right turning state and performing right turning alarm, wherein M is greater than or equal to N and N is greater than a fourth threshold value.

By the times that the continuous first speed signal is greater than the second speed signal, unnecessary alarm signals sent by operations such as vehicle fine adjustment and direction correction can be avoided, and the alarm precision is improved; whether the vehicle enters a turning state and the speed of entering the turning state (the speed of turning) can be more accurately judged by detecting the second difference value, so that whether the speed exceeds the range set by the threshold value is determined, and a turning alarm is given when the condition is met; through the number of times of detecting the second difference, the further screening of entering the turning alarm state is increased, so that the alarm is more accurate and the actual driving state is more fit.

In this embodiment, the values of the third threshold, the fourth threshold and B, M, N may be selected according to actual vehicle model, vehicle speed and other factors, where the vehicle model includes vehicle length, vehicle width and tire size. According to the technical scheme of the application, reasonable values can be obtained through limited tests by a person skilled in the art, and whether the values are the same or not, the reasonable values are within the technical scheme disclosed by the invention.

In the present embodiment, some possible modes are given, such as determining that the vehicle enters a right turn state and performing a right turn warning when the first speed signal is greater than the second speed signal is continuously detected 10 times; when it is continuously detected that the first speed signal is greater than the second speed signal 10 times and that the second difference between the first speed signal and the second speed signal is greater than 7 8 times (third threshold), the fourth threshold may be set to 7, and it is determined that the vehicle enters a right turn state and a right turn warning is performed.

In an embodiment of the present invention, after determining that the vehicle enters the left turn state, the vehicle turn warning method further includes:

and when the first difference value is continuously detected to be larger than the fifth threshold value, determining that the vehicle exits the left-turning state and stopping the left-turning alarm.

Or when the first difference value is larger than the fifth threshold value for Z times continuously detected, determining that the vehicle exits the left-turning state and stopping the left-turning alarm.

By detecting the first difference value, whether the actual driving state of the vehicle exits the turning state can be judged more accurately, and therefore the actual more accurate turning alarm is achieved.

In this embodiment, the values of the fifth threshold and Z may be selected according to actual vehicle model, vehicle speed, and other factors, where the vehicle model includes vehicle length, vehicle width, and tire size. According to the technical scheme of the application, reasonable values can be obtained through limited tests by a person skilled in the art, and whether the values are the same or not, the reasonable values are within the technical scheme disclosed by the invention.

In this embodiment, a possible implementation is given such that when the first difference is greater than minus 3 (the fifth threshold) and occurs 8 times in succession, the alarm determines that the vehicle has exited the left turn state, and then automatically stops the left turn alarm. The value of Z should be greater than a seventh threshold, which may be 7.

In this embodiment, the vehicle remains in the left turn alert state until the left turn alert state has been entered and the exit left turn state has not been reached.

In an embodiment of the present invention, after determining that the vehicle enters the right turn state, the vehicle turn warning method further includes:

and when the second difference value is continuously detected to be smaller than the sixth threshold value, determining that the vehicle exits the right turning state and stopping the right turning alarm.

Or when the second difference value is less than the sixth threshold value for Q times continuously detected, determining that the vehicle exits the right turning state and stopping the right turning alarm.

By detecting the second difference value, whether the actual driving state of the vehicle exits the turning state can be judged more accurately, and therefore the actual more accurate turning alarm is achieved.

In this embodiment, the values of the sixth threshold and Q may be selected according to actual vehicle model, vehicle speed, and other factors, where the vehicle model includes vehicle length, vehicle width, and tire size. According to the technical scheme of the application, reasonable values can be obtained through limited tests by a person skilled in the art, and whether the values are the same or not, the reasonable values are within the technical scheme disclosed by the invention.

In this embodiment, a possible implementation is given such that when the second difference is less than 3 (fifth threshold) and occurs 8 times in succession, the alarm determines that the vehicle has exited the left turn state, and then automatically stops the left turn alarm. The value of Q should be greater than an eighth threshold, which may be 7.

In the present embodiment, the vehicle maintains the right turn warning state until the right turn warning state has been entered and the exit right turn state has not been reached.

Example 2:

referring to the attached figure 2, the invention also discloses a vehicle turning alarm device, which is applied to vehicle turning alarm and comprises a first acquisition module and a first comparison module.

The first obtaining module is used for obtaining a first speed signal of a left wheel of the vehicle and a second speed signal of a right wheel of the vehicle in real time.

The first comparison module is used for comparing the magnitude of the first speed signal with the magnitude of the second speed signal, and when the first speed signal is continuously detected to be smaller than the second speed signal, the vehicle is determined to enter a left-turn state and a left-turn alarm is carried out; and when the first speed signal is continuously detected to be larger than the second speed signal, determining that the vehicle enters a right turning state and performing right turning alarm.

This embodiment 2 is written based on embodiment 1, and includes all the technical features of embodiment 1, and those skilled in the art can set the corresponding functional modules according to the content of embodiment 1.

Example 3:

referring to the attached figure 3, the invention also discloses a vehicle turning alarm system, which is applied to the turning alarm of a vehicle and comprises a vehicle turning alarm device, an ABS controller, a steering axle left wheel speed sensor and a steering axle right wheel speed sensor.

In this embodiment, the ABS controller is configured to receive a first wheel speed signal and a second wheel speed signal sent by a left wheel speed sensor and a right wheel speed sensor of a steering axle, and convert the first wheel speed signal and the second wheel speed signal into a first CAN message and a second CAN message and send the first CAN message and the second CAN message to a vehicle turning alarm.

In this embodiment, the vehicle turning warning device uses the vehicle turning warning method described in embodiment 1 to compare a received first CAN message with a second CAN message, and perform a vehicle turning warning according to a comparison result, where the first CAN message is a first speed signal, and the second CAN message is a second speed signal.

In summary, compared with the prior art, the vehicle turning alarm method, the vehicle turning alarm device and the vehicle turning alarm system provided by the embodiment of the invention have the beneficial effects that: directly acquiring a first speed signal of a left wheel of the vehicle and a second speed signal of a right wheel of the vehicle as a logic decision basis of turning alarm, so that dependence of turning alarm on the driving state of a driver according to whether a steering lamp of the driver is turned on or not is avoided; meanwhile, the first speed signal and the second speed signal are adopted, a steering wheel corner sensor is not required to be additionally arranged, the cost is low, and the popularization is easy; the decision is made according to the size of the first speed signal and the second speed signal in a continuous range, so that the warning of turning warning is more accurate, and the potential safety hazard caused by wrong warning for the following vehicle when the driver finely adjusts the direction is avoided.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.