CN102848920B - A kind of method for limiting speed of automobile and speed-limiting device - Google Patents

Abstract

The invention discloses a speed limit method for a car, which includes: step 1, turning on the speed limit mode of the car, and obtaining the set first speed limit; Identify the speed limit sign on the speed limit plate in the video data, thereby obtaining the second speed limit; Step 3, judge whether the second speed limit is less than the first speed limit, if so, use the second speed limit as the current speed limit speed limit, otherwise, the first speed limit is used as the current speed limit; Step 4, vehicle speed control is performed based on the current speed limit. The invention maintains the vehicle within a relatively safe speed range through the way that the vehicle independently adapts to the speed limit on the speed limit plate, avoids the vehicle from overspeeding, and reduces the possibility of traffic accidents of the vehicle.

Description

Speed-limiting method and speed-limiting device for automobile

technical field

The invention relates to the technical field of automobiles, in particular to an automobile speed limiting method and a speed limiting device.

Background technique

In our daily life, we often hear the phrase "nine out of ten accidents are fast", which shows that fast speed is considered to be one of the most important factors causing traffic accidents. In order to reduce the speed of vehicles on dangerous road sections, road The traffic department, according to the road alignment characteristics and traffic accident statistics, limits different vehicle speeds for different road sections, and prompts them in the form of speed limit signs. But for some drivers, often due to speculation or carelessness, they exceed the speed limit sign, causing unnecessary tickets or even a traffic accident.

For the limit of the speed of the car, there is already a speed limiter technology, which is generally: EMS (Engine Management System, engine management system) adjusts the engine freezing torque according to the limit speed set by the driver. For example: the driver sets the speed limit to 60kph, then the engine EMS adjusts the torque to limit the vehicle speed below 60kph. However, if the speed limit of the driving section is 55kph at this time, the driver may still drive over the speed limit.

Contents of the invention

The purpose of the present invention is to provide a speed-limiting method and a speed-limiting device for automobiles, which can maintain the vehicle within a relatively safe speed range through the vehicle's autonomous adaptation to the speed limit on the speed-limit plate, avoiding the speeding of the vehicle, and reducing the speed of the vehicle. the possibility of vehicle accidents.

In order to achieve the above object, the invention provides a speed-limiting method of an automobile, comprising:

Step 1, turn on the speed limit mode of the car to obtain the set first speed limit;

Step 2, the camera acquires video data around the road, and the camera control unit recognizes the speed limit sign on the speed limit plate from the video data, thereby obtaining the second speed limit;

Step 3, judging whether the second speed limit is lower than the first speed limit, if yes, use the second speed limit as the current speed limit, otherwise use the first speed limit as the current speed limit;

Step 4: Carry out vehicle speed control based on the current speed limit.

Preferably, in the above-mentioned rate-limiting method, the step four includes:

Judging whether the current vehicle speed is less than the current speed limit, if yes, no speed regulation is performed, otherwise, judging whether the engine accelerator pedal is activated;

If said engine accelerator pedal is activated, no speed limiting measures are taken;

If the accelerator pedal of the engine is not activated, an alarm is issued and a speed limit measure is taken until the current vehicle speed is less than the current speed limit.

Preferably, in the above speed limiting method, the speed limiting measures include: adjusting the engine torque.

Preferably, in the above speed limiting method, the speed limiting measures further include: braking or reducing fuel supply.

Preferably, in the above speed limiting method, the warning includes: displaying the speed value on the display screen in a flickering manner and/or issuing a sound prompt.

Preferably, the above speed limiting method also includes:

If the current speed limit is the second speed limit, calculate the running distance below the current speed limit, and if the running distance is greater than a distance threshold, use the first speed limit as the Current speed limit.

Preferably, in the above-mentioned speed limit method, in the step 1, the first speed limit is set through the speed setting button, and if the first speed limit is not set, then by reading the last time limit in the memory The first speed limit is obtained by using the set value when exercising.

Preferably, in the above-mentioned speed limit method, if the time that the speed setting button is pressed each time is longer than the first threshold, the increase or decrease of the first limit speed is 5 kilometers per hour; if the If the time that the speed setting button is pressed each time is less than the first threshold, the increase or decrease of the first speed limit is 1 km/h.

The present invention also provides a speed limiting device for an automobile, comprising:

The engine control unit is used to: turn on the speed limit mode of the car to obtain the set first speed limit;

The camera is used to: acquire video data around the road;

The camera control unit is used to: identify the speed limit sign on the speed limit board from the video data, so as to obtain the second speed limit;

The engine control unit is further configured to: judge whether the second speed limit is lower than the first speed limit, if yes, use the second speed limit as the current speed limit, otherwise use the first speed limit as the current speed limit. the current speed limit; the vehicle speed is controlled by the current speed limit.

Preferably, in the above-mentioned speed limiting device, the engine control unit is used to: judge whether the current vehicle speed is lower than the current speed limit, and if yes, do not adjust the vehicle speed; otherwise, judge whether the engine accelerator pedal is activated; if the engine accelerator pedal If the pedal is activated, no speed limit measures are taken; if the engine accelerator pedal is not activated, an alarm is issued and speed limit measures are taken until the current vehicle speed is less than the current speed limit.

Preferably, the above speed limiting device also includes:

Human-machine control unit. It is used for: displaying the speed value by flashing on the display screen and/or issuing a sound prompt to perform the warning.

Preferably, the above speed limiting device also includes:

The speed setting button is used to: input the speed setting signal;

The button conversion unit is used for: if the time when the speed setting button is pressed each time is greater than the first threshold, the increase or decrease change value of the first speed limit is 5 kilometers per hour; if the speed setting If the key is pressed each time for less than the first threshold, then the increase or decrease change value of the first speed limit is 1 km/h.

Embodiments of the present invention at least have the following technical effects:

1) From the perspective of speed limit, the embodiment of the present invention maintains the vehicle within a relatively safe speed range by autonomously adapting to the speed limit on the speed limit plate. On the one hand, the possibility of traffic accidents on the vehicle is greatly reduced. , At the same time save the driver a lot of speeding tickets.

2) The embodiment of the present invention not only considers the second speed limit on the speed limit plate, but also considers the first speed limit set by the vehicle itself, and the minimum value of the two is taken to ensure no speeding.

3) The embodiment of the present invention infers that the section of the speed limit sign has passed by the distance threshold value, avoiding the problem of driving at the speed limit sign after passing the speed limit section of the speed limit sign.

Description of drawings

Fig. 1 is the flow chart of the steps of the method embodiment of the present invention;

Fig. 2 is the control logic diagram of the workflow provided by the method embodiment of the present invention;

Fig. 3 is a structural diagram of a speed limiting device provided by an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, specific embodiments will be described in detail below with reference to the accompanying drawings.

Fig. 1 is the step flowchart of the method embodiment of the present invention, as shown in Fig. 1, the embodiment of the present invention provides a kind of speed limiting method of automobile, it is characterized in that, comprises:

Step 101, turning on the speed limit mode of the car to obtain the set first speed limit;

Step 102, the camera acquires video data around the road, and the camera control unit recognizes the speed limit sign on the speed limit sign from the video data, thereby obtaining a second speed limit;

Step 103, judging whether the second speed limit is lower than the first speed limit, if yes, use the second speed limit as the current speed limit, otherwise use the first speed limit as the current speed limit;

Step 104, perform vehicle speed control according to the current speed limit.

It can be seen that, from the perspective of limiting the speed of the vehicle, the embodiment of the present invention maintains the vehicle within a relatively safe speed range by automatically adapting the vehicle to the speed limit on the speed limit plate. On the one hand, the possibility of traffic accidents on the vehicle is greatly reduced. , At the same time save the driver a lot of speeding tickets. Moreover, the embodiment of the present invention not only considers the second speed limit on the speed limit plate, but also considers the first speed limit set by the vehicle itself, and the minimum value of the two is taken to ensure no speeding.

Wherein, identifying the speed limit sign on the speed limit plate from the video data can be realized by conventional image comparison technology, because the shape and size of the speed limit plate are generally determined, and the content of the speed limit plate is generally determined. The number of the speed limit, such as "60" means that the speed limit is 60 km/h, so it is a mature technology to find the image with the speed limit plate from the video stream and recognize the number on the speed limit plate. No longer.

In a preferred embodiment of the present invention, in the step 104, the vehicle speed is controlled in the following manner:

Judging whether the current vehicle speed is less than the current speed limit, if yes, no speed regulation is performed, otherwise, judging whether the engine accelerator pedal is activated;

If the accelerator pedal of the engine is activated, it means that the driver is actively driving, and he may be overtaking when he steps on the accelerator pedal, so speed limit measures cannot be taken at this time for safety reasons;

If the accelerator pedal of the engine is not activated, it means that it is in a normal speed limit mode, then an alarm needs to be issued, and speed limit measures are taken until the current vehicle speed is less than the current speed limit.

Wherein, the speed limiting measure includes: adjusting the engine torque. Can also include: braking or reducing fuel supply. The warning includes: the display screen blinks and displays the speed value and/or sends out a sound prompt.

Therefore, the present invention integrates the camera image processing technology and the speed limit device into one body, and can realize the function of automatically adjusting the speed limit value of the engine according to the speed on the speed limit plate, for example: during the driver's driving, the initial speed limit value setting When the driver drives to a section with a speed limit of 55kph, the system automatically adjusts the speed limit to 55kph. This can ensure that the vehicle will always travel within the speed limit.

In some cases, the following problems may also be encountered by adjusting the speed of the vehicle through the second speed limit on the speed limit plate: on some turning roads, the speed limit plate "40" may be placed, and after the curve passes, it may not be cancelled. The sign of the speed limit, so if you keep driving according to the speed limit of 40, it will cause inconvenience to the driver. Therefore, for some special speed limits, such as the speed limit below the speed limit "40", the speed limit distance in the city will not be very long, so it is necessary to adjust through these features. Therefore, in one embodiment of the present invention, it also includes: if the current speed limit is the second speed limit (here, the numerical range of the second speed limit can be further limited, for example, less than 40, because the speed limit The road section less than 40 will not be very long, and if the road section with a speed limit of 80 may be the entire highway, it will be very long), then calculate the driving distance under the current speed limit, if the driving distance is greater than the distance gate limit (such as 500 meters or 2000 meters), then it is inferred that the road section of the speed limit plate has passed, then cancel the second speed limit on the speed limit plate, and use the first speed limit set by the car itself as the first speed limit. Describe the current speed limit. In this way, the problem of running at the speed of the speed limit plate after having passed the speed limit section of the speed limit plate is avoided.

In the step 101, the first speed limit is set through the speed setting button, and if the first speed limit is not set, the set value of the last exercise in the memory is read to obtain the The first speed limit. If the time that the speed setting button is pressed each time is greater than the first threshold, the increase or decrease change value of the first speed limit is 5 kilometers per hour; if the speed setting button is pressed every time is less than the first threshold, then the increase or decrease of the first speed limit is 1 km/h.

Fig. 2 is a control logic diagram of the workflow provided by the method embodiment of the present invention. As shown in Fig. 2, the workflow control logic of the vehicle speed limiting system is as follows: after the engine is ignited, the system will enter the self-check mode, and after the self-check is completed, At this time, the driver selects the speed limit mode (standby state) by pressing the button, and the speed limit value in the man-machine control module is read from the last SLD (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory) ( speed limit device, speed limit device), the driver can adjust the speed limit value by pressing the button SET+/-, short press to increase or decrease every 1kph; long press to increase or decrease every 5kph; set the speed limit value After that, the speed limit function can be activated, or the speed limit function can be activated directly without adjusting the initialized speed limit value; at this time, the engine reads the speed limit value and records it as speed limit value 1; at this time, the camera starts to work and detects surrounding information , the camera control unit processes in real time and sends the detected speed limit value to the EMS, which is recorded as speed limit value 2. When two speed limit values are detected, the EMS (Engine Management System, engine control unit) will internally check the two values. Compare them, and take the smaller one, and record it as the speed limit value. And use the speed limit as the speed limit target to adjust. When the vehicle speed is lower than the speed limit value, EMS does not need to adjust until the system is turned off, and EMS saves the speed limit value; when the vehicle speed is greater than the speed limit value, the system judges whether the engine accelerator pedal is activated (that is, whether the electronic accelerator pedal travel switch is trigger), if the accelerator pedal is activated, it means that the speed limit value is temporarily exceeded, and no warning can be issued, or the man-machine control unit can be controlled to drive the display to give an alarm; , the real-time speed value is flashing and displayed, and an audible alarm is issued at the same time. The warning signal must be issued when the vehicle speed is greater than the set value of 3km/h. The speed limit means that the system starts to adjust the torque until the vehicle speed returns below the speed limit value; If the engine is adjusted anyway (exceeding the engine limit operating conditions), the vehicle speed cannot be reduced below the speed limit value, and the driver needs to reset the speed limit value. Or maintain the current status.

Fig. 3 is the structural diagram of the speed limiting device that the embodiment of the present invention provides, as shown in Fig. 3, the speed limiting device of automobile comprises:

The engine control unit 310 is used to: turn on the speed limit mode of the car to obtain the set first speed limit;

The camera 320 is used to: obtain video data around the road;

The camera control unit 330 is configured to: identify the speed limit sign on the speed limit board from the video data, so as to obtain the second speed limit;

The engine control unit 310 is further configured to: judge whether the second speed limit is lower than the first speed limit, if yes, use the second speed limit as the current speed limit, otherwise use the first speed limit as the current speed limit. The current speed limit; the vehicle speed is controlled by the current speed limit.

The engine control unit is used for: judging whether the current vehicle speed is lower than the current speed limit, if yes, no speed regulation is performed, otherwise, judging whether the engine accelerator pedal is activated; if the engine accelerator pedal is activated, then no speed limit Measures; if the accelerator pedal of the engine is not activated, an alarm is issued and a speed limit measure is taken until the current vehicle speed is less than the current speed limit.

In one embodiment, it further includes: a man-machine control unit 340 . It is used for: displaying the speed value by flashing on the display screen and/or issuing a sound prompt to perform the warning.

In one embodiment, it also includes: a speed setting button 350, used for: inputting a speed setting signal; a button conversion unit 360, used for: if the duration of the speed setting button being pressed each time is greater than the first threshold , then the increase or decrease change value of the first speed limit is 5 kilometers per hour; if the speed setting button is pressed each time for less than the first threshold, the increase or decrease of the first speed limit The minus change value is 1 km/h.

As shown in Figure 3, the speed limiting device is a system composed of multiple components, and the specific functions of each component are as follows: the camera is used to collect the environmental information around the vehicle, and the camera control unit is used to analyze and process the collected signals , to extract the speed limit value of the speed limit plate; the speed setting button 350 is composed of 4 buttons, and the 4 buttons ON/OFF, SET\CANCEL, SET+, SET- are respectively used to open\close, cancel, and set the speed limit value Increase and decrease the set speed limit value; after the engine is ignited, the driver clicks the ON/OFF switch, and the system enters the standby state. At this time, the driver can adjust the speed limit value through SET+ and SET-. After the adjustment of the speed limit value is completed, The speed limit function can be activated by SET\CANCEL; if the driver needs to exit the speed limit function at this time, press SET\CANCEL and the system will return to the standby state. EMS is the torque adjustment and control unit of the system. It is responsible for limiting the vehicle speed according to the speed limit value input by the camera and the driver. After receiving the two speed limit values, the EMS will compare the two values and choose the smaller one. The speed limit value is used to limit the speed, the human-machine control unit is used to process the quality emitted by the engine, and the drive display screen displays the SLD status and alarm function.

It can be seen from the above that the embodiments of the present invention have the following advantages:

1) From the perspective of speed limit, the embodiment of the present invention maintains the vehicle within a relatively safe speed range by autonomously adapting to the speed limit on the speed limit plate. On the one hand, the possibility of traffic accidents on the vehicle is greatly reduced. , At the same time save the driver a lot of speeding tickets.

2) The embodiment of the present invention not only considers the second speed limit on the speed limit plate, but also considers the first speed limit set by the vehicle itself, and the minimum value of the two is taken to ensure no speeding.

3) The embodiment of the present invention infers that the section of the speed limit sign has passed by the distance threshold value, avoiding the problem of driving at the speed limit sign after passing the speed limit section of the speed limit sign.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. a method for limiting speed for automobile, is characterized in that, comprising:

Step 1, the speed limit pattern of opening automobile, obtains the first maximum speed limit of setting;

Step 2, camera obtains the video data of road periphery, and camera control module is from instituteState the speed limit of identifying on speed limitation board in video data and identify, thereby obtain the second maximum speed limit;

Step 3, judges that whether described the second maximum speed limit is less than described the first maximum speed limit, isUsing described the second maximum speed limit as current maximum speed limit, otherwise by described the first maximum speed limitAs described current maximum speed limit;

Step 4, carries out speed of a motor vehicle control by described current maximum speed limit;

Wherein, described step 4 comprises:

Judging whether current vehicle speed is less than described current maximum speed limit, is not carry out speed of a motor vehicle adjusting,Otherwise judge whether engine throttle pedal is activated;

If described engine throttle pedal is to be activated, do not take speed limit measure;

If described engine throttle pedal is not activated, sends alarm, and take speed limitMeasure, until described current vehicle speed is less than described current maximum speed limit.

2. method for limiting speed according to claim 1, is characterized in that, described speed limit measureComprise: engine torque is adjusted.

3. method for limiting speed according to claim 2, is characterized in that, described speed limit measureAlso comprise: brake or minimizing fuel feeding.

4. method for limiting speed according to claim 1, is characterized in that, described alarm comprises:Display screen carries out flickering display and/or the prompting of sounding to velocity amplitude.

5. according to the method for limiting speed described in any one in claim 1 to 4, it is characterized in that,Also comprise:

If described current maximum speed limit is described the second maximum speed limit, calculate described currentEnforcement distance under maximum speed limit, if described enforcement distance is greater than distance threshold value, willDescribed the first maximum speed limit is as described current maximum speed limit.

6. method for limiting speed according to claim 5, is characterized in that, in described step 1,Negotiation speed is set button and is set described the first maximum speed limit, if do not set described firstSetting value when maximum speed limit was exercised by the last time in read memory obtains described firstMaximum speed limit.

7. method for limiting speed according to claim 6, is characterized in that, if described speedThe duration that setting button is pressed is at every turn greater than the first thresholding, the increasing of described the first maximum speed limitSubtracting changing value is 5 kilometer per hours; If the duration that described Speed Setting button is pressed at every turnBe less than described the first thresholding, the increase and decrease value of described the first maximum speed limit is that 1 km is often littleTime.

8. a speed-limiting device for automobile, is characterized in that, comprising:

Control unit of engine, for: the speed limit pattern of opening automobile, obtains first of settingMaximum speed limit;

Camera, for: the video data that obtains road periphery;

Camera control module, for: the speed limit speed limitation board identified from described video dataMark, thus the second maximum speed limit obtained;

Described control unit of engine, also for: judge whether described the second maximum speed limit is less thanDescribed the first maximum speed limit, is using described the second maximum speed limit as current maximum speed limit, noUsing described the first maximum speed limit as described current maximum speed limit; By described current restriction speedDegree carries out speed of a motor vehicle control;

Wherein, described control unit of engine, also for: judge whether current vehicle speed is less than instituteState current maximum speed limit, be not carry out speed of a motor vehicle adjusting, otherwise judge that engine throttle pedal isNo being activated; If described engine throttle pedal is to be activated, do not take speed limit measure;If described engine throttle pedal is not activated, send alarm, and take speed limit measure,Until described current vehicle speed is less than described current maximum speed limit.

9. speed-limiting device according to claim 8, is characterized in that, also comprises:

Man-machine control module, for: by display screen, velocity amplitude is carried out flickering display and/or sent outGo out auditory tone cues and carry out described alarm.

10. speed-limiting device according to claim 8, is characterized in that, also comprises:

Speed Setting button, for: input speed setting signal;

Button converting unit, for: if the duration that described Speed Setting button is pressed at every turnBe greater than the first thresholding, the increase and decrease value of described the first maximum speed limit is 5 kilometer per hours;If the duration that described Speed Setting button is pressed is less than described the first thresholding at every turn, described inThe increase and decrease value of the first maximum speed limit is 1 kilometer per hour.