Vehicle speed control method, system and vehicle

Abstract

The present application relates to a vehicle speed control method, system, and vehicle. The method includes: in response to turning on a switch for limiting the maximum speed of the vehicle, determining the vehicle's pre-travel road and obtaining the speed limit of the pre-travel road; obtaining the vehicle's current driving speed and acceleration; when the distance between the vehicle and the entrance of the pre-travel road is less than or equal to a preset distance threshold, determining whether the vehicle is maintaining full-speed driving; if the vehicle is maintaining full-speed driving, adjusting the acceleration according to a preset adjustment amplitude, and controlling the driving speed to be adjusted to the speed limit for a preset adjustment duration; if the vehicle is not maintaining full-speed driving, not adjusting the acceleration. The vehicle speed control method, system, and vehicle of the present application adjust the acceleration when the vehicle is maintaining full-speed driving to control the driving speed to be adjusted to the speed limit for a preset adjustment duration, thereby avoiding safety accidents caused by speeding.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a vehicle speed control method, system and vehicle. Background Art

[0002] The maximum speed of existing pure electric vehicles cannot be set by the driver, and can only be determined by how deeply the accelerator pedal is stepped on. On roads with frequent speed limits, drivers can easily exceed the speed limit, causing life-threatening danger.

[0003] Some models with limited features, such as cruise control, require drivers to frequently depress the accelerator and brake pedals to keep the vehicle below the maximum speed limit, such as 120 km / h, when driving on highways for extended periods. This situation can quickly lead to fatigue in the driver's legs and feet, severely impacting the driving experience.

[0004] In view of the above problems, those skilled in the art have been seeking solutions. Summary of the Invention

[0005] The technical problem to be solved by the present application is to provide a vehicle speed control method, system and vehicle in view of the defects of the above-mentioned prior art, so as to avoid safety accidents caused by vehicle speeding.

[0006] In order to achieve the above objectives, this application is implemented through the following technical solutions:

[0007] A vehicle speed control method comprises the following steps:

[0008] In response to turning on a switch for limiting the maximum speed of the vehicle, determining a road on which the vehicle is to travel and obtaining a speed limit on the road on which the vehicle is to travel;

[0009] Obtaining the current speed and acceleration of the vehicle;

[0010] When the distance between the vehicle and the entrance of the planned driving road is less than or equal to a preset distance threshold, determining whether the vehicle maintains full speed driving;

[0011] If the vehicle is traveling at full speed, the acceleration is adjusted according to a preset adjustment range, and the driving speed is controlled to be adjusted to the speed limit within a preset adjustment time;

[0012] If the vehicle is not traveling at full speed, the acceleration is not adjusted.

[0013] Optionally, the step of controlling the driving speed to be adjusted to the speed limit within a preset adjustment time includes:

[0014] Acquire the corresponding current maximum output torque of the vehicle according to the driving speed;

[0015] The engine speed of the vehicle is adjusted according to the maximum output torque to control the current driving speed to be adjusted to the speed limit within a preset adjustment time.

[0016] Optionally, the step of obtaining the corresponding current maximum output torque of the vehicle according to the driving speed includes:

[0017] determining the corresponding maximum output torque coefficient according to the driving speed;

[0018] The current maximum output torque of the vehicle is determined according to the product of the rated maximum output torque of the vehicle and the maximum output torque coefficient.

[0019] Optionally, the step of determining the corresponding maximum output torque coefficient according to the driving speed includes:

[0020] Setting a first reference speed and a second reference speed according to the speed limit, wherein the speed limit is greater than the first reference speed and less than the second reference speed;

[0021] When the driving speed is less than or equal to the first reference speed, setting the maximum output torque coefficient to 1;

[0022] When the driving speed is greater than or equal to the second reference speed, setting the maximum output torque coefficient to 0;

[0023] When the driving speed is between the first reference speed and the second reference speed, the maximum output torque coefficient of the vehicle is set to a preset coefficient value, and the preset coefficient value is between 0 and 1.

[0024] Optionally, the method further includes: when the distance between the vehicle and the planned driving road is less than or equal to a preset distance threshold, controlling the current driving speed to slowly switch to the speed limit through voice commands.

[0025] The present application also provides a vehicle speed control system, comprising: a large screen controller, a camera, a chassis domain controller, and a vehicle controller;

[0026] The large screen controller, the camera, and the chassis domain controller are respectively connected to the vehicle controller;

[0027] The large screen controller is provided with a navigation map, and the navigation map and the camera are used to obtain the speed limit of the road on which the vehicle is to travel, and to obtain the distance between the vehicle and the entrance of the road on which the vehicle is to travel;

[0028] The chassis domain controller is used to obtain the current driving speed and acceleration of the vehicle;

[0029] The vehicle controller is used to: when the distance between the vehicle and the entrance of the pre-driving road is less than or equal to a preset distance threshold, determine whether the vehicle is maintaining a full-speed driving state; and, if the vehicle is maintaining a full-speed driving state, adjust the acceleration according to a preset adjustment amplitude, and control the driving speed to be adjusted to the speed limit for a preset adjustment time; and, if the vehicle is not maintaining a full-speed driving state, not adjust the acceleration.

[0030] Optionally, the large-screen controller is further used to output an alarm message when the distance between the vehicle and the entrance of the planned driving road is less than or equal to a preset distance.

[0031] Optionally, the vehicle controller is further used to: obtain the corresponding current maximum output torque of the vehicle based on the driving speed, and determine the current maximum output torque of the vehicle based on the product of the rated maximum output torque of the vehicle and the maximum output torque coefficient.

[0032] Optionally, the vehicle speed control system also includes a motor controller and a motor; the motor controller is connected to the vehicle controller and the motor, and is used to adjust the engine speed of the vehicle according to the maximum output torque to control the current driving speed to the limit speed within a preset adjustment time.

[0033] The present application also provides a vehicle, comprising the above-mentioned vehicle speed control system.

[0034] The vehicle speed control method, system and vehicle of the present application adjust the acceleration while the vehicle is driving at full speed to control the driving speed to the speed limit within a preset adjustment time, thereby avoiding safety accidents caused by speeding.

[0035] In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present application will be described in detail below with reference to the accompanying drawings and specific implementation methods;

[0037] Figure 1 This is a flow chart of a vehicle speed control method provided by an embodiment of the present application;

[0038] Figure 2 This is a functional module diagram of a vehicle speed control system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0039] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] Figure 1 This is a flow chart of a vehicle speed control method provided by an embodiment of the present application. Figure 1 , the present application provides a vehicle speed control method, comprising the following steps:

[0041] S1: In response to turning on a switch for limiting the maximum speed of the vehicle, determining a road on which the vehicle will travel and obtaining a speed limit on the road on which the vehicle will travel.

[0042] S2: Get the vehicle's current speed and acceleration.

[0043] S3: When the distance between the vehicle and the entrance of the planned driving road is less than or equal to a preset distance threshold, determine whether the vehicle maintains a full-speed driving state.

[0044] S4: If the vehicle maintains full speed, the acceleration is adjusted according to a preset adjustment range, and the driving speed is controlled to be adjusted to the speed limit within a preset adjustment time.

[0045] S5: If the vehicle is not traveling at full speed, no acceleration adjustment is made.

[0046] In one embodiment, the process before step S2 may further include: a user manually inputting a speed limit of the planned travel road when the vehicle is stationary, and the vehicle storing the speed limit of the planned travel road locally.

[0047] In one embodiment, the preset distance threshold is 0.5 km, and in other embodiments it may be greater than 0.5 km.

[0048] In one embodiment, the preset adjustment range is ±1 m / s2. In other embodiments, a larger adjustment range, such as ±3 m / s2, may be selected for different vehicles.

[0049] Optionally, if the vehicle maintains full speed, the deceleration can be adjusted according to a preset adjustment range.

[0050] For example, when a vehicle with navigation enabled is traveling at full speed on a road with a 60 km / h speed limit and is 0.5 km from the entrance to the intended road, and the next road has a speed limit of 40 km / h, the vehicle will issue a voice and / or text reminder, such as "40 km / h speed limit ahead, please drive safely." Meanwhile, the driver continues traveling at full speed. To ensure driving safety, the acceleration at full speed is limited to, for example, ±1 m / s², to ensure the vehicle slowly decelerates to 40 km / h. Alternatively, if the driver does not maintain full speed during the speed limit switch, acceleration is not limited, and normal driving takes precedence. If the vehicle does not have navigation enabled, the driver can actively limit the speed based on the current road speed limit sign, or issue a voice command to control the vehicle to limit acceleration at full speed.

[0051] Optionally, the step of controlling the driving speed to be adjusted to the speed limit within a preset adjustment time includes:

[0052] Obtain the current maximum output torque of the corresponding vehicle according to the driving speed;

[0053] The vehicle's engine speed is adjusted according to the maximum output torque to control the driving speed to the speed limit within a preset adjustment time.

[0054] Optionally, the step of obtaining the current maximum output torque of the corresponding vehicle according to the driving speed includes:

[0055] Determine the corresponding maximum output torque coefficient according to the driving speed;

[0056] The current maximum output torque of the vehicle is determined according to the product of the rated maximum output torque of the vehicle and the maximum output torque coefficient.

[0057] Optionally, the step of determining the corresponding maximum output torque coefficient according to the driving speed includes:

[0058] Setting a first reference speed and a second reference speed according to a speed limit, wherein the speed limit is greater than the first reference speed and less than the second reference speed;

[0059] When the driving speed is less than or equal to the first reference speed, the maximum output torque coefficient is set to 1;

[0060] When the driving speed is greater than or equal to the second reference speed, the maximum output torque coefficient is set to 0;

[0061] When the driving speed is between the first reference speed and the second reference speed, the maximum output torque coefficient of the vehicle is set to a preset coefficient value, and the preset coefficient value is between 0 and 1.

[0062] In one embodiment, the range of the preset coefficient value between 0 and 1 is obtained by simulating vehicle parameters, including a drag curve, a transmission ratio, and a half-load mass. The range of the preset coefficient value varies depending on the type of vehicle.

[0063] In one embodiment, the preset coefficient value is in a linear functional relationship with the current driving speed of the vehicle, and as the driving speed decreases, the preset coefficient value gradually increases.

[0064] In one embodiment, during vehicle travel, when the output torque requested by the user does not exceed the vehicle's current maximum output torque, the vehicle's travel is controlled based on the output torque requested by the user. As the driver steps on the pedal to accelerate, if the output torque requested by the user exceeds the maximum output torque, the vehicle's torque output is controlled based on the maximum output torque obtained in the previous step. This can achieve control of the vehicle's maximum speed limit and avoid overtaking and traffic accidents.

[0065] Optionally, the method further includes: when the distance between the vehicle and the planned driving road is less than or equal to a preset distance threshold, controlling the driving speed to be adjusted to the speed limit for a preset adjustment time through voice instructions.

[0066] The present application also provides a vehicle speed control system, comprising: a large screen controller 10, a camera 20, a chassis domain controller 30, and a vehicle controller 40;

[0067] The large screen controller 10, camera 20, and chassis domain controller 30 are respectively connected to the vehicle controller 40;

[0068] The large screen controller 10 is provided with a navigation map 11, and the navigation map 11 and the camera 20 are used to obtain the speed limit of the road to be traveled by the vehicle, and obtain the distance between the vehicle and the entrance of the road to be traveled;

[0069] The chassis domain controller 30 is used to obtain the current speed and acceleration of the vehicle;

[0070] The vehicle controller 40 is used to: when the distance between the vehicle and the entrance of the pre-driving road is less than or equal to a preset distance threshold, determine whether the vehicle is maintaining full speed driving; and, if the vehicle is maintaining full speed driving, adjust the acceleration according to a preset adjustment amplitude, and control the driving speed to be adjusted to the speed limit for a preset adjustment time; and, if the vehicle is not maintaining full speed driving, do not adjust the acceleration.

[0071] In one embodiment, the large-screen controller 10 is equipped with an automatic maximum speed limit switch. When this switch is on, the maximum speed set by the manufacturer is used as the default. When the automatic maximum speed limit switch is turned on, the large-screen controller 10 outputs a control signal to the vehicle controller 40 to enable wireless communication with the large-screen controller 10. After the driver turns on the automatic maximum speed limit switch, the navigation map 11 identifies the speed limit of the current road in real time based on the road information currently located by the vehicle. When there is no network, the navigation map 11 obtains the speed limit based on the local map. Furthermore, when there is no network or local map, the navigation map 11 outputs fault feedback information to the large-screen controller 10.

[0072] In one embodiment, when the driver turns on the automatic maximum speed limit switch, the camera 20 will also synchronously identify the current road speed limit sign in real time to determine the current road speed limit. Optionally, when the camera 20 fails, it outputs fault feedback information to the large screen controller 10.

[0073] Preferably, if both the navigation map 11 and the camera 20 are in good condition, the speed limit obtained by the camera 20 is selected with higher priority than that obtained by the navigation map 11; if both the navigation map 11 and the camera 20 fail to identify the speed limit of the current road in real time, the automatic maximum speed limit switch is automatically turned off and the large-screen controller 10 broadcasts an alarm message to remind the driver.

[0074] Optionally, the large screen controller 10 is also used to output an alarm message when the distance between the vehicle and the entrance of the planned driving road is less than or equal to a preset distance.

[0075] Optionally, the vehicle controller 40 is further configured to obtain the corresponding current maximum output torque of the vehicle according to the driving speed, and determine the current maximum output torque of the vehicle according to the product of the rated maximum output torque of the vehicle and the maximum output torque coefficient.

[0076] Optionally, the vehicle speed control system also includes a motor controller 50 and a motor 60; the motor controller 50 is connected to the vehicle controller 40 and the motor 60, and is used to adjust the engine speed of the vehicle according to the maximum output torque to control the current driving speed to the limit speed within a preset adjustment time.

[0077] The present application also provides a vehicle, characterized in that it includes the above-mentioned vehicle speed control system

[0078] The vehicle speed control method, system and vehicle of the present application adjust the acceleration while the vehicle is driving at full speed to control the driving speed to the speed limit within a preset adjustment time, thereby avoiding safety accidents caused by speeding.

[0079] Obviously, the above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments. The embodiments and descriptions are only for illustrating the principles of the present application. Any modifications, equivalent replacements, or improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A vehicle speed control method, characterized in that: The following steps are involved: In response to turning on a switch for limiting the maximum speed of the vehicle, determining a road on which the vehicle is to travel and obtaining a speed limit on the road on which the vehicle is to travel; Obtaining the current speed and acceleration of the vehicle; When the distance between the vehicle and the entrance of the planned driving road is less than or equal to a preset distance threshold, determining whether the vehicle maintains full speed driving; If the vehicle is traveling at full speed, the acceleration is adjusted according to a preset adjustment range, and the driving speed is controlled to be adjusted to the speed limit within a preset adjustment time; If the vehicle is not traveling at full speed, no adjustment is made to the acceleration; The step of controlling the driving speed to be adjusted to the speed limit within a preset adjustment time comprises: Acquire the corresponding current maximum output torque of the vehicle according to the driving speed; adjusting the engine speed of the vehicle according to the maximum output torque to control the driving speed to be adjusted to the speed limit for a preset adjustment time; The step of obtaining the corresponding current maximum output torque of the vehicle according to the driving speed includes: determining the corresponding maximum output torque coefficient according to the driving speed; The current maximum output torque of the vehicle is determined according to the product of the rated maximum output torque of the vehicle and the maximum output torque coefficient.

2. The vehicle speed control method according to claim 1, wherein: The step of determining the corresponding maximum output torque coefficient according to the driving speed includes: Setting a first reference speed and a second reference speed according to the speed limit, wherein the speed limit is greater than the first reference speed and less than the second reference speed; When the driving speed is less than or equal to the first reference speed, setting the maximum output torque coefficient to 1; When the driving speed is greater than or equal to the second reference speed, setting the maximum output torque coefficient to 0; When the driving speed is between the first reference speed and the second reference speed, the maximum output torque coefficient of the vehicle is set to a preset coefficient value, and the preset coefficient value is between 0 and 1.

3. The vehicle speed control method according to claim 1, wherein: The method further includes: controlling the driving speed to be adjusted to the speed limit for a preset adjustment time through voice commands based on a distance between the vehicle and the planned driving road being less than or equal to a preset distance threshold.

4. A vehicle speed control system, using the vehicle speed control method according to any one of claims 1 to 3, characterized in that: include: Large screen controller, camera, chassis domain controller, vehicle controller; The large screen controller, the camera, and the chassis domain controller are respectively connected to the vehicle controller; The large screen controller is provided with a navigation map, and the navigation map and the camera are used to obtain the speed limit of the road on which the vehicle is to travel, and to obtain the distance between the vehicle and the entrance of the road on which the vehicle is to travel; The chassis domain controller is used to obtain the current driving speed and acceleration of the vehicle; The vehicle controller is configured to: when the distance between the vehicle and the entrance of the planned driving road is less than or equal to a preset distance threshold, determine whether the vehicle maintains full speed driving; and, if the vehicle maintains full speed, adjusting the acceleration according to a preset adjustment amplitude, controlling the driving speed to be adjusted to the speed limit for a preset adjustment time; and, if the vehicle does not maintain full speed, not adjusting the acceleration.

5. The vehicle speed control system according to claim 4, wherein: The large screen controller is also used to output a warning message when the distance between the vehicle and the entrance of the planned driving road is less than or equal to a preset distance.

6. The vehicle speed control system according to claim 5, wherein: The vehicle controller is further configured to obtain the corresponding current maximum output torque of the vehicle according to the driving speed, and determine the current maximum output torque of the vehicle according to the product of the rated maximum output torque of the vehicle and the maximum output torque coefficient.

7. The vehicle speed control system according to claim 6, wherein: The vehicle speed control system also includes a motor controller and a motor; the motor controller is connected to the vehicle controller and the motor, and is used to adjust the engine speed of the vehicle according to the maximum output torque to control the current driving speed to the limit speed within a preset adjustment time.

8. A vehicle, characterized in that: Comprising a vehicle speed control system as claimed in any one of claims 4 to 7.

Images