WO2018072357A1

WO2018072357A1 - Vehicle speed control method and device

Info

Publication number: WO2018072357A1
Application number: PCT/CN2017/071866
Authority: WO
Inventors: 刘均; 宋朝忠; 欧阳张鹏
Original assignee: 深圳市元征科技股份有限公司
Priority date: 2016-10-20
Filing date: 2017-01-20
Publication date: 2018-04-26
Also published as: CN106564374A; CN106564374B

Abstract

A vehicle speed control method and a vehicle speed control device. The method comprises the following steps: monitoring traveling information of a vehicle during traveling of the vehicle; determining, according to the traveling information, whether the traveling environment is unfavorable for traveling of the vehicle; if yes, limiting the maximum rotation speed of the engine to a preset rotation speed, and limiting the maximum vehicle speed by limiting the maximum rotation speed; and if not, cancelling, if the maximum rotation speed of the engine is limited to the preset rotation speed, the limitation. The device comprises: a monitoring module used for monitoring traveling information of a vehicle during traveling of the vehicle; a determining module used for determining, according to the traveling information, whether the traveling environment is unfavorable for traveling of the vehicle; a speed limiting module used for limiting the maximum rotation speed of the engine to a preset rotation speed when it is determined that the traveling environment is unfavorable for traveling of the vehicle according to the obtained traveling information of the vehicle, and limiting the maximum vehicle speed by limiting the maximum rotation speed; and a canceling module used for canceling, when it is determined that the traveling environment is favorable for traveling of the vehicle according to the obtained traveling information of the vehicle, and the maximum rotation speed of the engine is limited to the preset rotation speed, the limitation. On the basis of different vehicle traveling environments, the method and device actively limits the maximum speed of a vehicle when the traveling environment is poor, and thus avoids potential safety hazards; moreover, the vehicle can be ensured to travel at a high speed when the traveling environment is good.

Description

Vehicle speed control method and device

Technical field

The invention relates to the field of automobiles, and in particular to a method and a device for controlling a speed of a vehicle.

Background technique

At present, cars are driving in different driving conditions, whether on mountain roads or heavy rains, or on clear highways: the maximum speed that a vehicle can reach is the same. However, when the driving environment is not good, if the driver is driving at a high speed, it is very likely to cause a traffic accident, which brings safety hazards to the driver of the vehicle and other vehicle drivers, and if the maximum speed of the vehicle is set at the factory, It is not possible to drive the vehicle at a high speed when the driving environment is good.

Summary of the invention

The main object of the present invention is to provide a vehicle speed control method, which aims to limit the maximum vehicle speed when the driving environment is not good, to avoid safety hazards, and to ensure that the vehicle can travel at a high speed when the driving environment is good.

To achieve the above object, a vehicle speed control method provided by the present invention includes the following steps:

Monitoring the driving information of the vehicle during the running of the vehicle;

Determining, according to the driving information, whether the driving environment is unfavorable for driving the vehicle;

If yes, limiting the maximum speed of the engine to a preset speed, limiting the maximum speed by limiting the maximum speed;

If not, the limit is cancelled if the maximum speed of the engine has been limited to the preset speed.

Preferably, the monitoring the driving information of the vehicle during the running of the vehicle comprises: monitoring an operation signal transmitted by the control circuit of the wiper;

Determining whether the driving environment is unfavorable for driving the vehicle according to the driving information comprises: determining that the working time of the wiper exceeds the first preset time length according to an operation signal transmitted from the control circuit of the wiper, determining that Yes.

Preferably, the monitoring the driving information of the vehicle during the running of the vehicle comprises: monitoring information about a road surface angle of the vehicle from the gyroscope;

Determining whether the driving environment is unfavorable for driving the vehicle according to the driving information comprises: determining that the road surface angle is greater than a preset angle and continuing to exceed the second preset time according to the information of the road surface angle of the vehicle traveled by the gyroscope When it is judged as yes.

Preferably, the monitoring the driving information of the vehicle during the running of the vehicle comprises:

Monitor real-time images taken by the driving recorder;

The determining whether the driving environment is unfavorable for driving the vehicle according to the driving information comprises: determining that it is YES when it is determined that there is rain or fog in the real-time image according to the real-time image captured by the driving recorder.

Preferably, when the real-time image captured by the driving recorder is monitored, a portion of the image detecting area is irradiated with a strong light using a parallel beam.

Preferably, the maximum speed of the limit engine is a preset speed, and limiting the maximum speed by limiting the maximum speed includes:

Sending a speed limit signal to the engine management system;

When the rotational speed of the engine is higher than the preset rotational speed, the rotational speed of the engine is reduced by reducing the fuel injection amount of the engine.

In addition, in order to achieve the above object, the present invention further provides a vehicle speed control device, where the vehicle speed control device includes: a monitoring module, configured to monitor driving information of the vehicle during running of the vehicle;

a determining module, configured to determine, according to the driving information, whether the driving environment is unfavorable for driving the vehicle;

a speed limit module, when determining that the driving environment is unfavorable for the vehicle to travel according to the obtaining the driving information of the vehicle, limiting the maximum speed of the engine to a preset speed, and limiting the maximum speed by limiting the maximum speed;

The canceling module cancels the restriction when it is determined that the driving environment is not unfavorable for the vehicle to travel according to the driving information of the vehicle, and the maximum speed of the engine has been limited to the preset speed.

Preferably, the monitoring module comprises: a first monitoring unit, configured to monitor an operation signal transmitted by a control circuit of the wiper;

The determining module includes: a first determining unit, configured to determine, when the working time of the wiper exceeds a first preset duration according to an operation signal sent by the control circuit of the wiper.

Preferably, the monitoring module comprises: a second monitoring unit, configured to monitor information about a road surface angle of the vehicle from the gyroscope;

The determining module includes: a second determining unit, configured to determine, when the road surface angle is greater than a preset angle according to the information of the road surface angle of the vehicle transmitted by the gyroscope, and continues to exceed the second preset time length, Yes.

Preferably, the monitoring module comprises: a third monitoring unit, configured to monitor a real-time image taken by the driving recorder;

The determining module includes: a third determining unit, configured to determine, when it is determined that there is rain or fog in the real-time image according to the real-time image captured by the driving recorder.

Preferably, the third monitoring unit performs a strong light illumination on a portion of the picture detection area using a parallel beam.

Preferably, the speed limit module comprises:

a sending unit, configured to send a speed limit signal to the engine management system;

a speed reduction unit that reduces the engine speed by reducing the fuel injection amount of the engine when the engine speed is higher than the preset speed.

The invention monitors the driving information of the vehicle during the running of the vehicle; determines whether the driving environment is unfavorable for the driving of the vehicle according to the driving information; if yes, limits the maximum speed of the engine to a preset speed, and limits the maximum speed by limiting the maximum speed The vehicle speed; if not, if the maximum speed of the engine has been limited to the preset speed, the limit is cancelled. Therefore, according to different driving conditions of the vehicle, the maximum speed of the vehicle is actively limited when the driving environment is not good, and safety hazards are avoided. At the same time, when the driving environment is good, the vehicle can be driven at a high speed.

DRAWINGS

1 is a schematic flow chart of an embodiment of a vehicle speed control method according to the present invention;

2 is a schematic flow chart of another embodiment of a vehicle speed control method according to the present invention;

3 is a schematic diagram of functional modules of an embodiment of a vehicle speed control apparatus according to the present invention;

4 is a schematic diagram of a refinement function module of a restriction module in another embodiment of the vehicle speed control device of the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The present invention provides a vehicle speed control method. Referring to FIG. 1, in a first embodiment of the vehicle speed control method of the present invention, the vehicle speed control method includes:

Step S10, monitoring driving information of the vehicle during running of the vehicle;

Step S20: determining, according to the driving information, whether the driving environment is unfavorable for driving the vehicle;

Whether the driving environment of the vehicle is favorable for driving the vehicle is determined by analyzing the driving information, for example, determining whether the driving environment is rainy or foggy.

If it is determined that the driving environment is unfavorable for driving the vehicle according to the driving information of the vehicle, step S30 is executed to limit the maximum speed of the engine to a preset speed, and limit the maximum speed by limiting the maximum speed;

When the driving environment is unfavorable for the vehicle to travel, in order to be safer, the present invention adopts the maximum speed of the engine that actively limits the vehicle to limit the maximum vehicle speed of the vehicle, and avoids a safety accident caused by high-speed driving when the driving environment of the vehicle is not good.

If it is determined that the driving environment is not unfavorable for the vehicle running according to the obtaining the driving information of the vehicle, step S40 is performed, and if the maximum speed of the engine has been limited to the preset speed, the restriction is cancelled.

When the driving environment of the vehicle is not unsafe, if the maximum speed of the engine has been limited, the maximum speed limit of the vehicle should be canceled to ensure that the user can drive at a high speed, and if there is no limit, no processing is performed.

Specifically, when the vehicle is traveling on a snowy road surface, by monitoring the driving information of the vehicle, the driving information indicates that the vehicle is continuously slipping, it is confirmed that the driving environment is unfavorable for the vehicle to travel. Limit the maximum engine speed to 2000 rev / min, the corresponding vehicle speed is 40 km / h, so that the vehicle does not drive at high speed; when it is not judged that the vehicle is driving in the snow according to the driving information, it is checked whether the maximum engine speed has been It is restricted, if it is restricted, the engine maximum speed is 2000 rpm, so that the vehicle can run at full speed. The embodiment enables the vehicle to automatically select different maximum vehicle speeds according to different driving environments, that is, to ensure the safety when the driving environment is not good, and to ensure that the vehicle can travel at a high speed when the driving environment is good.

In the second embodiment of the vehicle speed control method of the present invention, the step S10 includes: monitoring an operation signal transmitted by the control circuit of the wiper;

By setting a monitoring circuit for the control circuit of the automobile wiper, the first level signal is sent when the wiper is in operation, and the second level signal is sent periodically when in the working state, when the wiper ends working The third level signal is transmitted, and the time during which the wiper operates is judged by the time difference between the occurrence of the third level signal and the first level signal.

In some embodiments, when the wiper begins to operate, a level signal is sent and continues until the wiper stops operating, and the wiper operating time is calculated based on the duration of the level signal.

The step S20 includes: when it is determined that the working time of the wiper exceeds the first preset duration according to the operation signal transmitted from the control circuit of the wiper, the determination is yes.

When the wiper is operated for more than a predetermined period of time, the vehicle is considered to be traveling in the rain or in an environment that affects the driver's line of sight. Specifically, the first preset time is 2 minutes. When the wiper starts to work, the control circuit of the wiper sends a first level signal indicating the start, and then every 20 seconds. Receiving a second level signal indicating that the operation is coming from the monitoring circuit, when the third level signal indicating the end is received, the time when the entire wiper is turned on does not exceed 2 minutes. Determining whether the driving environment is not unfavorable for the vehicle to travel, checking whether the maximum engine speed has been limited, and if so, releasing the engine maximum speed limit; as described above, if it is the 20th time, it is received. When the third level signal is obtained, it can be obtained that the entire wiper has been turned on for more than 2 minutes, and it is judged that the driving environment of the vehicle is not conducive to the running of the vehicle, and the maximum speed of the engine is immediately limited to 2000 rpm. Limit the maximum speed and avoid traffic accidents caused by high-speed vehicles.

According to the first embodiment of the vehicle speed control method of the present invention, in the third embodiment of the vehicle speed control method of the present invention, the step S10 includes: monitoring information of a road surface angle of the vehicle from the gyroscope;

The step S20 includes: when it is determined that the road surface angle is greater than a preset angle according to the information of the road surface angle of the vehicle transmitted by the gyroscope and continues to exceed the second preset time length, the determination is yes.

Specifically, the preset angle is 20 degrees, and the second preset time is 60 seconds, and the gyroscope has the capability of detecting vehicle turning data. When the vehicle turns, the preset turning times To: turn 10 times less than a certain angle, the rotation angle is 140 degrees, more specifically, the driving angle of the vehicle is from the second preset time, and the information transmitted by the gyroscope exceeds one Presetting the percentage of data, while the vehicle is running, continuously receiving the angle information sent by the gyroscope, the gyroscope detects that the vehicle is traveling at an elevation angle of 21 degrees or at a depression angle of 21 degrees for 61 seconds, more specifically within 61 seconds. 90% of the data from the gyroscope indicates that the vehicle is actually moving uphill or downhill at 21 degrees, limiting the maximum engine speed to 2000 rpm, under continuous monitoring, if The gyroscope checks that the vehicle is driven at an elevation angle or a depression angle of 19 degrees for 61 seconds, then cancels the 2000 rpm limit of the engine; and when it detects that the vehicle has 11 turns less than 140 degrees in 60 seconds , that the vehicle is not Driving in a driving environment, limiting the maximum engine speed to 2000 rpm. This makes it possible to actively limit the maximum engine speed in corners, rain, or mountain roads to limit the maximum vehicle speed and ensure safety.

In the fourth embodiment of the vehicle speed control method of the present invention, the step S10 includes: monitoring a real-time image captured by the driving recorder according to the first embodiment of the vehicle speed control method of the present invention;

The step S20 includes: when it is determined that there is rain or fog in the real-time image according to the real-time image taken by the driving recorder, the determination is yes.

Using the real-time image taken by the driving recorder, the image is captured at a high frequency, and each image is sampled and analyzed to determine the driving environment of the vehicle. For example, if there are many bright spots in the image, it can be considered as rainy. Yes.

Specifically, when the vehicle is traveling in the rain, the driving recorder is sampled in a preset time frame, and more specifically, the screen is sampled and analyzed every 30 seconds continuously within five minutes. When there are a large number of bright spots in the fixed area, it is judged to be traveling in the rain; if a large gray-white background appears on the screen, it is judged to be traveling in the fog. Actively limit the maximum speed of the engine to 2000 rev / min. Under continuous monitoring, if the picture is sampled and analyzed every 30 seconds for five minutes, when the bright spot or gray background of the fixed area of the picture disappears, cancel The engine is limited to 2000 rpm. This makes it possible to actively limit the maximum engine speed in rainy days to limit the maximum vehicle speed and ensure safety.

In the embodiment of the vehicle speed control method of the present invention, in order to obtain a more favorable analysis picture, a portion of the picture detection area is irradiated with a strong light using a parallel beam when the sampling picture is taken, so that the captured raindrop is more easily recognized.

Referring to FIG. 2, in a fifth embodiment of the vehicle speed control method according to the present invention, in the fifth embodiment of the vehicle speed control method of the present invention, when the running environment is unfavorable for the vehicle to travel, the maximum speed of the limit engine is The preset speed is limited by limiting the maximum speed to include the maximum speed:

Step S31, sending a speed limit signal to the engine management system;

There are many ways to reduce the engine speed, and the intake air amount or the exhaust amount is passively reduced, but in order to protect the engine, the engine management system or ECU (Electronic) is adopted. Control Unit: Electronic Control Unit) to control the engine to actively reduce the speed.

Step S32, when the rotational speed of the engine is higher than the preset rotational speed, the rotational speed of the engine is reduced by reducing the fuel injection amount of the engine.

Specifically, a speed limit signal that satisfies the CAN protocol is transmitted to the engine management system through the CAN bus. When the engine speed is turned to 2000 rpm, the engine management system actively adjusts the engine, reduces fuel injection, reduces the engine speed, and starts normal after the speed drops 2000 rpm. Fuel injection, so that the engine speed will not exceed 2000 rev / min, thus limiting the maximum speed, limiting the maximum speed of the vehicle when the driving environment is not good, to ensure safety.

The present invention also provides a vehicle speed control apparatus. Referring to FIG. 3, in the first embodiment of the vehicle speed control method of the present invention, the vehicle speed control apparatus includes:

The monitoring module 10 is configured to monitor driving information of the vehicle during running of the vehicle;

The determining module 20 is configured to determine, according to the driving information, whether the driving environment is unfavorable for driving the vehicle;

The speed limit module 30, when determining that the driving environment is unfavorable for the vehicle running according to the obtaining the driving information of the vehicle, limiting the maximum speed of the engine to a preset speed, and limiting the maximum speed by limiting the maximum speed;

The canceling module 40 cancels the limit when it is determined that the driving environment is not unfavorable for the running of the vehicle according to the driving information of the vehicle, and the maximum speed of the engine has been limited to the preset speed.

Specifically, when the vehicle is traveling on a snowy road surface, the driving information of the vehicle is monitored by the monitoring module 10, and the determining module 20 determines, according to the driving information, that the vehicle does not stop sliding, and confirms that the driving environment is not For the driving of the vehicle, the speed limit module 30 is activated to limit the maximum engine speed to 2000 rpm, and the corresponding vehicle speed is 40 km/h, so that the vehicle does not travel at a high speed; when the judging module 20 does not judge the driving information according to the driving information When the vehicle is traveling in snow, the start cancel module 40 checks whether the maximum engine speed has been limited, and if so, cancels the engine maximum speed of 2000 rpm. Allows the vehicle to travel at full speed. The embodiment enables the vehicle to automatically select different maximum vehicle speeds according to different driving environments, that is, to ensure the safety when the driving environment is not good, and to ensure that the vehicle can travel at a high speed when the driving environment is good.

In the second embodiment of the vehicle speed control device of the present invention, the monitoring module 10 includes: a first monitoring unit for monitoring the operation of the control circuit of the wiper. signal;

The determining module 20 includes: a first determining unit, configured to determine, when the working time of the wiper exceeds a first preset duration according to an operation signal sent by the control circuit of the wiper.

When the wiper is operated for more than a predetermined period of time, the vehicle is considered to be traveling in the rain or in an environment that affects the driver's line of sight. Specifically, the first preset time is 2 minutes. When the wiper starts to work, the control circuit of the wiper sends a first level signal indicating the start, and then every 20 seconds. Receiving, by the first monitoring unit, a second level signal indicating that the first level is received, and when the first monitoring unit receives the third level signal indicating the end, Obtaining that the entire wiper is not turned on for more than 2 minutes, the first determining unit determines that the driving environment is not unfavorable for the vehicle to travel, and checks whether the maximum engine speed has been limited, and if not, cancels the The maximum speed limit of the engine; as described above, if the third level signal is received by the first monitoring unit in the 20th time, it can be obtained that the entire wiper has been turned on for more than 2 minutes, then the first The judging unit judges that the driving environment of the vehicle is not conducive to the running of the vehicle, and immediately limits the maximum speed of the engine to 2000 rpm, limits the maximum speed, and avoids the high speed of the vehicle. Driving causes a traffic accident.

In the third embodiment of the vehicle speed control device of the present invention, the monitoring module 10 includes: a second monitoring unit for monitoring the road surface angle of the vehicle from the gyroscope. information;

The determining module 20 includes: a second determining unit, configured to determine, when the road surface angle is greater than a preset angle according to the information of the road surface angle of the vehicle transmitted by the gyroscope, and continues to exceed the second preset time length, Yes.

Specifically, the preset angle is 20 degrees, and the second preset time is 60 seconds, and the gyroscope has the capability of detecting vehicle turning data. When the vehicle turns, the preset turning times To: turn 10 times less than a certain angle, the rotation angle is 140 degrees, more specifically, the driving angle of the vehicle is from the second preset time, and the information transmitted by the gyroscope exceeds one Presetting the percentage of data, while the vehicle is running, the second monitoring unit continuously receives the angle information sent by the gyroscope, and the gyroscope checks that the vehicle travels at an elevation angle of 21 degrees or at a depression angle of 21 degrees for 61 seconds. Specifically, when 90% of the information transmitted by the gyroscope in 61 seconds indicates that the vehicle is actually traveling uphill or downhill at 21 degrees, the second determining unit determines that the vehicle is in a driving environment unfavorable for traveling. And limiting the maximum rotational speed of the engine to 2000 rpm, and if the gyroscope detects that the vehicle is traveling at an elevation angle or a depression angle of 19 degrees for 61 seconds under the continuous monitoring of the second monitoring unit, the second determining unit Judge the vehicle In a driving environment that is not conducive to driving, canceling the 2000 rpm limit of the engine; and when the second monitoring unit detects that the vehicle has 11 turns less than 140 degrees in 60 seconds If the vehicle is considered to be driving in an environment unfavorable for driving, the second determining unit determines that the vehicle is limited to a maximum speed of 2000 rpm in the driving environment that is unfavorable for driving, so that Too many turns, or in the rain, or in the mountain road can also actively limit the maximum engine speed to limit the maximum speed of the vehicle, to ensure safety.

In the fourth embodiment of the vehicle speed control device of the present invention, in the fourth embodiment of the vehicle speed control device of the present invention, the monitoring module 10 includes: a third monitoring unit, configured to monitor a real-time image taken by the driving recorder;

The determining module 20 includes: a third determining unit, configured to determine, when it is determined that there is rain or fog in the real-time image according to the real-time image captured by the driving recorder.

Specifically, when the vehicle is traveling in the rain, the driving recorder is sampled in a preset time frame, and more specifically, the third monitoring unit continuously displays the screen every 30 seconds within five minutes. Sampling analysis is carried out. When a large number of bright spots appear in the fixed area of the screen, it is judged to be traveling in the rain; if a large gray-white background appears on the screen, it is judged to be traveling in the fog. Actively limiting the maximum speed of the engine to 2000 rpm, under continuous monitoring, if the third monitoring unit continuously samples and analyzes the picture every 30 seconds within five minutes, the third determining unit determines when When the bright spot or the off-white background of the fixed area of the screen disappears, the engine's 2000 rpm limit is cancelled, so that the maximum engine speed can be actively limited in rainy days to limit the maximum vehicle speed and ensure safety.

In the embodiment of the vehicle speed control method of the present invention, in order to obtain a more favorable analysis screen, a parallel light beam is used to illuminate a part of the image detection area with a parallel light beam to make the captured raindrop more. Easy to be identified.

Referring to FIG. 4, in the fifth embodiment of the vehicle speed control device of the present invention, the speed limit module 30 includes:

The sending unit 31 is configured to send a speed limit signal to the engine management system;

The speed reduction unit 32 reduces the engine speed by reducing the fuel injection amount of the engine when the engine speed is higher than the preset speed.

Specifically, the transmitting unit 31 transmits a speed limit signal that satisfies the CAN protocol to the engine management system via the CAN bus. When the engine speed is turned to 2000 rpm, the engine management system activates the speed reduction unit 32 to adjust the engine, reduce fuel injection, and reduce the engine speed when the speed drops by 2000 rpm. The normal fuel injection started after the engine is started, so that the engine speed does not exceed 2000 rpm, thereby limiting the maximum speed, limiting the maximum speed of the vehicle when the driving environment is not good, and ensuring safety.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

A vehicle speed control method, characterized in that the vehicle speed control method comprises the following steps:

Monitoring the driving information of the vehicle during the running of the vehicle;

Determining, according to the driving information, whether the driving environment is unfavorable for driving the vehicle;

If yes, limiting the maximum speed of the engine to a preset speed, limiting the maximum speed by limiting the maximum speed;

If not, the limit is cancelled if the maximum speed of the engine has been limited to the preset speed.
The vehicle speed control method according to claim 1, wherein the maximum speed of the limit engine is a preset speed, and limiting the maximum speed by limiting the maximum speed comprises:

Sending a speed limit signal to the engine management system;

When the rotational speed of the engine is higher than the preset rotational speed, the rotational speed of the engine is reduced by reducing the fuel injection amount of the engine.
The vehicle speed control method according to claim 1, wherein the monitoring the driving information of the vehicle during the running of the vehicle comprises: monitoring an operation signal transmitted by the control circuit of the wiper;

Determining whether the driving environment is unfavorable for driving the vehicle according to the driving information comprises: determining that the working time of the wiper exceeds the first preset time length according to an operation signal transmitted from the control circuit of the wiper, determining that Yes.
The vehicle speed control method according to claim 3, wherein the limiting the maximum speed of the engine is a preset speed, and limiting the maximum speed by limiting the maximum speed comprises:

Sending a speed limit signal to the engine management system;

When the rotational speed of the engine is higher than the preset rotational speed, the rotational speed of the engine is reduced by reducing the fuel injection amount of the engine.
The vehicle speed control method according to claim 1, wherein the monitoring the driving information of the vehicle during the running of the vehicle comprises: monitoring information of a road surface angle of the vehicle from the gyro;

Determining whether the driving environment is unfavorable for driving the vehicle according to the driving information comprises: determining that the road surface angle is greater than a preset angle and continuing to exceed the second preset time according to the information of the road surface angle of the vehicle traveled by the gyroscope When it is judged as yes.
The vehicle speed control method according to claim 5, wherein said limiting the maximum speed of the engine is a preset speed, and limiting the maximum speed by limiting said maximum speed comprises:

Sending a speed limit signal to the engine management system;

When the rotational speed of the engine is higher than the preset rotational speed, the rotational speed of the engine is reduced by reducing the fuel injection amount of the engine.
The vehicle speed control method according to claim 1, wherein the monitoring the driving information of the vehicle during the running of the vehicle comprises:

Monitor real-time images taken by the driving recorder;

The determining whether the driving environment is unfavorable for driving the vehicle according to the driving information comprises: determining that it is YES when it is determined that there is rain or fog in the real-time image according to the real-time image captured by the driving recorder.
The vehicle speed control method according to claim 7, wherein when the real-time image captured by the driving recorder is monitored, a portion of the image detecting area is irradiated with a strong light using a parallel light beam.
The vehicle speed control method according to claim 7, wherein the maximum speed of the limit engine is a preset speed, and limiting the maximum speed by limiting the maximum speed comprises:

Sending a speed limit signal to the engine management system;

When the rotational speed of the engine is higher than the preset rotational speed, the rotational speed of the engine is reduced by reducing the fuel injection amount of the engine.
A vehicle speed control device, characterized in that the vehicle speed control device comprises:

a monitoring module, configured to monitor driving information of the vehicle during running of the vehicle;

a determining module, configured to determine, according to the driving information, whether the driving environment is unfavorable for driving the vehicle;

a speed limit module, when determining that the driving environment is unfavorable for the vehicle to travel according to the obtaining the driving information of the vehicle, limiting the maximum speed of the engine to a preset speed, and limiting the maximum speed by limiting the maximum speed;

The canceling module cancels the restriction when it is determined that the driving environment is not unfavorable for the vehicle to travel according to the driving information of the vehicle, and the maximum speed of the engine has been limited to the preset speed.
The vehicle speed control device according to claim 10, wherein the speed limit module comprises:

a sending unit, configured to send a speed limit signal to the engine management system;

a speed reduction unit that reduces the engine speed by reducing the fuel injection amount of the engine when the engine speed is higher than the preset speed.
The vehicle speed control device according to claim 10, wherein the monitoring module comprises: a first monitoring unit for monitoring an operation signal transmitted from a control circuit of the wiper;

The determining module includes: a first determining unit, configured to determine, when the working time of the wiper exceeds a first preset duration according to an operation signal sent by the control circuit of the wiper.
The vehicle speed control device according to claim 11, wherein the speed limit module comprises:

a sending unit, configured to send a speed limit signal to the engine management system;

a speed reduction unit that reduces the engine speed by reducing the fuel injection amount of the engine when the engine speed is higher than the preset speed.
The vehicle speed control device according to claim 10, wherein the monitoring module comprises: a second monitoring unit, configured to monitor information about a road surface angle of the vehicle from the gyroscope;

The determining module includes: a second determining unit, configured to determine, when the road surface angle is greater than a preset angle according to the information of the road surface angle of the vehicle transmitted by the gyroscope, and continues to exceed the second preset time length, Yes.
The vehicle speed control device according to claim 14, wherein the speed limit module comprises:

a sending unit, configured to send a speed limit signal to the engine management system;

a speed reduction unit that reduces the engine speed by reducing the fuel injection amount of the engine when the engine speed is higher than the preset speed.
The vehicle speed control device according to claim 10, wherein the monitoring module comprises: a third monitoring unit for monitoring a real-time image taken by the driving recorder;

The determining module includes: a third determining unit, configured to determine, when it is determined that there is rain or fog in the real-time image according to the real-time image captured by the driving recorder.
The vehicle speed control apparatus according to claim 16, wherein said third monitoring unit performs a strong light illumination on a portion of the picture detection area using a parallel beam.
The vehicle speed control device according to claim 16, wherein the speed limit module comprises:

a sending unit, configured to send a speed limit signal to the engine management system;

a speed reduction unit that reduces the engine speed by reducing the fuel injection amount of the engine when the engine speed is higher than the preset speed.