CN112061124A

CN112061124A - Vehicle three-level speed limit control system and control method

Info

Publication number: CN112061124A
Application number: CN202010958585.3A
Authority: CN
Inventors: 孟祥柳
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2020-12-11

Abstract

The invention belongs to the field of vehicle speed limit control, and discloses a vehicle three-level speed limit control system which comprises a request signal generating part, a speed limit value acquiring module, a speed limit part, a vehicle speed sensor, an electronic accelerator and an electronic control unit, wherein the request signal generating part is provided with a function button for selecting the entering and exiting of a speed limit function mode, and the speed limit function mode comprises a manual speed limit mode and a positioning speed limit mode; the speed limiting part receives a control instruction of the request signal generating part and is used for selecting a speed limiting function mode and operation of the vehicle three-level speed limiting control system; the speed limit value acquisition module is used for acquiring a real-time speed limit value; the vehicle speed sensor is used for generating a vehicle speed signal to obtain a real-time vehicle speed value; the electronic accelerator is provided with a position sensor for generating a position signal and controlling the power output of a target vehicle, and the position signal corresponds to the stepping angle of the electronic accelerator and is used for judging the next operation of a driver.

Description

Vehicle three-level speed limit control system and control method

Technical Field

The invention relates to the field of automobile safe driving control, in particular to a vehicle three-level speed limit control system and a control method.

Background

At present, a cruise system and an adaptive cruise mode are generally adopted for vehicle cruise, the cruise system is generally called as a cruise system, the cruise function is started through the on-off of a control switch, the vehicle is maintained in a speed interval to realize the cruise function, the cruise system function is released through one operation step, the lower speed limit of the vehicle is limited under the condition that the peak value of the running speed of the vehicle is limited under the starting state of the function, the value of the cruise system is mainly reflected in the ideal road condition, the vehicle can run in the set speed interval through the cruise system function without controlling the running speed of the vehicle in real time, the artificial control and overspeed risks are reduced, and the cruise system is generally applied to medium-high-speed vehicles at present. However, it has the following disadvantages:

in the most basic way of releasing the cruise system of a vehicle, the brake device is controlled to generate a release signal of the cruise system to release the cruise system, and the cruise system is frequently operated in a short distance interval, so that the necessary deceleration and acceleration actions cannot be reduced, and excessive repeated operations are generated to induce traffic accidents.

When the vehicle runs on a road with complex road conditions, such as local protrusion or depression of the front road, vehicle faults can be caused by the current speed, the adjustment of the running speed is inevitable in the driving process, particularly on a road section with complex road conditions, a matching system of distance measurement and speed control mechanism is carried in some cases, the safety and speed control problems under the following condition are solved to a certain extent, the identification accuracy caused by the special object properties of the road surface, such as the shielding of the camera by foreign matters and the local deformation of the road surface, is not enough to make the system make theoretical response based on different measures, and the camera and the ranging radar technology with higher accuracy are still in the research and development test stage, therefore, a series of actions or combination of actions to be performed for acceleration, deceleration, braking and steering within a short distance still can not be judged and operated manually fundamentally.

The design logic of the cruise system is that a signal is sent to a control element through a switch, the control element controls a power source to keep an output torque which enables the vehicle speed to be relatively stable, the cruise system is started once, the vehicle running speed is limited by a control unit, and if any link of a communication signal generation switch → a communication signal transmission wire → a signal receiving and processing component → a communication information execution component fails, the vehicle running speed cannot be controlled in a normal mode, so the design logic of limiting the vehicle running speed has a safety hazard for the vehicle running.

The method for releasing the cruise system mainly comprises three methods, namely, the method for releasing the cruise system through closing a control signal comprises the following steps that the release mechanism of the cruise system needs steps, so that the required time is finished, the method for releasing the cruise system mainly comprises the following three methods, namely, 1, the method mostly needs manual exit, a driver needs to leave the road surface by eyes at the moment before the accident happens, a control switch is found accurately, the system receives an instruction to exit the cruise system, the driver adjusts the current speed again, and cannot perform deceleration action at the first time, so that the method is very dangerous and cannot meet the requirement of emergency; 2, by pressing the electronic accelerator control release system, as for driving habits, the first reflection of a driver is avoidance or deceleration, and the cruise system can be released by pressing the electronic accelerator based on the setting of the system, but the system does not accord with the instinctive reaction of the common driver, so that misoperation is easy to occur, and dangerous consequences are caused; "3" the system is released by pressing down the brake pedal, which is the most common method, but not all the emergency faults are that the brake component can be pressed down, such as the front wheel tire burst and the guide component sudden fault, it is correct to stabilize the direction and stop the acceleration action at the same time, so that the vehicle decelerates gradually under the action of the running resistance, and finally the vehicle speed is reduced by the brake system, if the fault occurs when the system is opened, the operation requirement for the driver is far higher than the normal level, which is very dangerous, there are no completely same accident sites in the world, for most drivers, it is difficult to use experience one to make reasonable operation to release the system, if the brake is released, the strength needs to be mastered, the excessive brake will increase the difficulty of vehicle control, even directly cause the vehicle to be out of control, the communication switch is closed or the electronic throttle is pressed, so that the short precious time is missed, and the use of the cruise system has potential safety hazards.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a vehicle three-level speed limit control system, which comprises a request signal generating part, a speed limit value acquiring module, a speed limit part, a vehicle speed sensor, an electronic throttle and an electronic control unit,

the request signal generating part is provided with a function button for selecting the entering and exiting of the speed limiting function mode, and the speed limiting function mode comprises a manual speed limiting mode and a positioning speed limiting mode;

the speed limiting part receives a control instruction of the request signal generating part and is used for selecting a speed limiting function mode and operation of the vehicle three-level speed limiting control system;

the speed limit value acquisition module is used for acquiring a real-time speed limit value;

the vehicle speed sensor is used for generating a vehicle speed signal to obtain a real-time vehicle speed value;

the electronic accelerator is provided with a position sensor for generating a position signal and controlling the power output of a target vehicle, and the position signal corresponds to the stepping angle of the electronic accelerator and is used for judging the next operation of a driver;

when receiving the request signal generating part to select to enter the corresponding speed limiting mode, the speed limiting part is configured to:

receiving position signals generated by a position sensor in real time, judging the next operation of a driver, reading real-time data of a speed limit value acquisition module in real time according to a functional mode selected by a request signal generation part to determine a speed limit value, combining the real-time vehicle speed value and the speed limit value, processing and calculating, and autonomously modifying the position signals input to an electronic control unit, wherein the electronic control unit carries out operation and processing on the basis of the position signals processed by the speed limit part, converts the position signals into corresponding acceleration signals, and controls the vehicle to run according to the control logic of a three-level speed limit system so as to realize the speed limit of the vehicle;

when the real-time speed is lower than the speed limit value, the parameter change of the position signal generated by the electronic throttle directly controls the running speed of the vehicle, and the vehicle is in a first-stage normal state stage of the three-stage speed limit system;

when the real-time speed reaches the speed limit value, the speed limit part automatically modifies the parameter value of the position signal generated by the electronic throttle, so that the real-time speed does not exceed the speed limit value, and the vehicle is in the second stage speed limit stage of the three-stage speed limit system;

when the real-time speed reaches the speed limit value and the stepping angle corresponding to the position signal generated by the electronic throttle exceeds the allowable span, the driver is proved to need to control the vehicle to accelerate, the speed limit part autonomously modifies the position signal parameter value output to the electronic control unit to control the vehicle to accelerate gradually, and the vehicle is in the third stage of the three-stage speed limit system at this moment.

Further, when the request signal generating part is received to select to enter a corresponding speed limiting mode, the electronic control unit receives a control instruction of the speed limiting part and controls the vehicle to run;

the speed limit portion is configured to:

when the target vehicle does not enter the speed-limiting function mode, the position signal generated by the electronic throttle is changed, the position signal is directly input to the electronic control unit through the speed-limiting part, and the electronic control unit converts the position signal generated by the electronic throttle into an acceleration signal to directly control the power output of the target vehicle;

when the request signal generating part selects to enter the speed limit function mode and the real-time vehicle speed is less than the speed limit value acquired by the speed limit value acquiring module, the position signal generated by the electronic throttle is directly input to the electronic control unit through the speed limit part, and the electronic control unit converts the position signal into an acceleration signal to directly control the power output of the target vehicle; at the moment, the vehicle is in a first stage normal state stage of the three-stage speed limiting system;

when the real-time vehicle speed reaches the speed limit value acquired by the speed limit value acquisition module, the speed limit part integrates the position information of the electronic accelerator, and autonomously modifies the position signal output to the electronic control unit, the electronic control unit receives the modified position signal, so that the speed per hour of the target vehicle does not exceed the target speed limit value, and the vehicle is in a second-stage speed limit stage of the three-stage speed limit system;

and step four, when the stepping angle of the electronic accelerator exceeds the allowable span range set in the speed limit stage, proving that the driver needs to accelerate temporarily, wherein the speed limit part synthesizes the position information of the electronic accelerator, autonomously modifies the position signal output to the electronic control unit, takes the position signal output to the electronic control unit by the current speed limit part as a base point, synthesizes the further change of the stepping angle of the electronic accelerator, controls the target vehicle to continuously and gradually increase the real-time speed, enables the real-time speed of the target vehicle to exceed the target speed limit value, and then the vehicle is in a third stage subsequent acceleration stage of the three-stage speed limit system.

Furthermore, the connection modes of the speed limiting part and the electronic control unit are selectively divided into serial connection and parallel connection;

the speed limiting part is connected in series with a signal transmission line of the sensor and the electronic control unit;

the electronic control unit and the speed limiting part are connected in parallel, and the electronic control unit and the speed limiting part simultaneously read position signals required by the speed limiting function, wherein when the speed limiting part and the electronic control unit are connected in parallel, when the three-level speed limiting system operates, the electronic control unit preferentially reads and executes control signals transmitted by the speed limiting part.

Furthermore, the speed limit value acquisition module comprises a GPS positioning module and a speed setting module, and the GPS positioning module is used for acquiring a first speed limit value of the GPS positioning module in real time when the vehicle is in a positioning speed limit mode; the speed setting module is used for manually setting a second speed limit value when the vehicle is in a manual speed limit mode.

Further, in the third step, when the vehicle is in the speed limit stage and the real-time vehicle speed reaches the speed limit value, and when the stepping angle of the electronic accelerator is within the allowable fluctuation span range, the third-level speed limit system determines that the driver wants to keep driving at the speed limit value, and controls the position signal, and is configured to: when the real-time speed is lower than a speed limit value, a position signal generated by a position sensor directly controls the power output of a vehicle, when the real-time speed reaches the speed limit value, a speed limit part autonomously modifies the position signal output to an electronic control unit to enable the vehicle not to exceed a target speed limit value, when the stepping action of an electronic accelerator is increased, the position signal generated by the position sensor and received by the speed limit part exceeds the upper limit of the allowable fluctuation span of a speed limit stage, the fact that a driver needs to temporarily accelerate is proved, and the position signal output to the electronic control unit is autonomously modified by the speed limit part to enable the target vehicle to gradually accelerate; wherein, the allowable fluctuation span of the position signal generated by the position sensor means that the three-stage speed limiting system corresponds to the stepping angle of the electronic accelerator according to the position signal generated by the position sensor, the acceleration signal generated by the stepping angle correspondingly generates a relative driving speed, the position information of the electronic accelerator corresponding to the real-time speed is determined according to the parameter, the three-stage speed limiting system judges the next operation of the driver by setting the fluctuation range of the acceleration signal and integrating the stepping angle of the electronic accelerator, when the real-time vehicle speed reaches the speed limiting value, the electronic accelerator is allowed to fluctuate at a certain angle, so that the real-time vehicle speed is kept relatively stable in the fluctuation range, the fluctuation range is used for determining the parameter basis of mutual transition between the second stage and the third stage in the three-stage speed limiting system, when the fluctuation angle of the electronic accelerator is lower than the allowable fluctuation range, and proving that a driver needs to control the vehicle to decelerate, directly controlling the real-time vehicle speed by the stepping angle of the electronic accelerator until the real-time vehicle speed reaches the speed limit value again, and repeating the steps to control the vehicle running state.

Further, when the real-time speed of the target vehicle is reduced to the speed limit value again, the system enters the second-stage speed limit stage from the third-stage successive acceleration stage, and when the target vehicle speed is lower than the speed limit value, the third-stage speed limit system enters the first-stage normal state stage from the second-stage speed limit stage, so that the target vehicle is controlled to run circularly until the driver sets and exits the speed limit system through the function button of the request signal generating part.

When the request signal generating part is received, the speed limiting function mode is selected through the control button, if the real-time vehicle speed value is larger than the speed limiting value, the speed limiting system does not interfere with the control signal until the real-time vehicle speed does not exceed the target speed limiting value, and the steps are repeated to control the vehicle to run.

Furthermore, the speed limiting part is provided with a speed compensation module, when the vehicle is in a second stage speed limiting stage and the real-time vehicle speed is changed, the speed compensation module reads that the stepping angle of the electronic accelerator is in an allowable fluctuation range, and proves that a driver wants to keep the current vehicle speed to run, and the speed compensation module correspondingly adjusts the position signal output to the electronic control unit based on the calculation of the position signal of the electronic accelerator and the comparison data of the real-time vehicle speed and the speed limiting value obtained in the speed limiting mode so as to increase or reduce power output and enable the real-time vehicle speed to approach the speed limiting value selected by the request signal generating part in the speed limiting function mode to run.

Further, the speed compensation module comprises:

the information acquisition unit is used for receiving signals from the speed limit value acquisition module, the position sensor and the vehicle speed sensor and transmitting the signals to the central processing unit;

the central processing unit is used for receiving and executing the signals of the information acquisition unit, processing and calculating output control signals;

and the signal output unit is used for receiving the control signal output by the central processing unit and outputting the signal to the electronic control unit.

Furthermore, the speed limiting part is also provided with a function button for adjusting the fluctuation range, and the function button is used for adjusting the allowable fluctuation range of the transition between the second-stage speed limiting state and the third-stage relay acceleration state.

Further, the speed limit part is further provided with a function button for adjusting the target speed limit value, and the function button is configured to: and adjusting the numerical value of the target speed limit value obtained by the three-stage speed limit system through the selected speed limit function mode by pressing a key arranged on the instrument desk.

Furthermore, the modified parameters are stored in a storage unit of the speed limiting part, and the restarted speed limiting system preferentially uses the last stored parameter setting.

Further, when the real-time speed limit value changes, the three-level speed limit system naturally generates a current speed limit value and a previous speed limit value, the speed limit value acquisition module transmits a current changed speed limit value signal to the running instrument for a driver to make the basis of the next operation, at the moment, the three-level speed limit system executes a control program of the previous speed limit value until the real-time speed is lower than the previous speed limit value, a position signal generated by the electronic throttle directly controls the real-time speed of the vehicle, and the speed limit part repeats the control steps according to the comparison of the current speed limit value and the real-time speed to control the vehicle to run.

Further, the speed limiting part includes:

the electronic control unit is used for acquiring signals output by functional components equipped in a target vehicle, performing comprehensive processing and calculation, and controlling the power output of the target vehicle by converting position signals generated by an electronic throttle into corresponding acceleration signals;

and the speed limit module is used for receiving signals from the speed limit value acquisition module, the position sensor and the vehicle speed sensor, carrying out comprehensive processing and calculation and then outputting a control signal to the electronic control unit, and the electronic control unit carries out comprehensive processing and calculation on the power output of the control target vehicle based on a control instruction.

Further, the speed limit module includes:

the input unit is used for receiving the speed-limiting function state information sent by the function button of the request signal generating part and transmitting the speed-limiting function state information to the central processing unit;

the man-machine interaction unit is used for operating through the real-time speed and speed limit value signals displayed by the running instrument and outputting the signals to the central processing unit;

the storage unit is used for storing the execution parameters set by the man-machine interaction unit in a speed-limiting state and transmitting the execution parameters to the central processing unit;

the central processing unit is used for receiving and executing the signals of the input unit, the storage unit, the human-computer interaction unit and the information acquisition unit, and processing and calculating output control signals;

Furthermore, the electronic control unit is internally provided with the system self-checking module which is used for acquiring control signals of all the functional sensors and data feedback of the execution component, is used for fault self-checking of the target vehicle, displays information corresponding to the fault on a driving instrument and is used as a judgment basis for a driver to perform the next operation;

when the system self-checking module checks the three-stage speed limiting system fault, the control program of the electronic control unit is preferentially executed.

The invention also provides a vehicle three-level speed limit control method, which comprises the following steps:

step one, manually selecting a speed limiting function mode, wherein the speed limiting mode comprises a manual speed limiting mode and a positioning speed limiting mode;

step two, after the selected speed limiting mode is determined, the current speed limiting value and the real-time vehicle speed value are obtained and compared; when the current speed limit value is smaller than the real-time speed, the speed limit function is not immediately executed, the stepping angle of the electronic accelerator directly determines the corresponding power output until the real-time speed does not exceed the current speed limit value, and then the three-stage speed limit system executes the following steps to control the vehicle to run according to the running state of the vehicle;

in the first state, when the real-time vehicle speed is less than the target speed limit value, the power output of the vehicle is directly controlled based on a signal for inputting the power change control until the speed limit value is reached;

when the real-time speed reaches the target speed limit value, limiting a signal for continuously accelerating to ensure that the real-time speed of the target vehicle does not exceed the target speed limit value until the real-time speed is lower than the target speed limit value, and repeating the step two;

and in the third state, when the position signal change of the corresponding electronic throttle is higher than the set allowable fluctuation range, the vehicle enters a third-stage speed relay stage based on the control instruction.

The invention has the beneficial effects that:

1. compared with a cruise system, the system and the method for limiting the driving speed in a grading way are different from constant-speed driving, and the speed limiting system does not interfere with the lower limit speed of a driving vehicle, so that even in an emergency, necessary releasing action does not exist, the operation steps are reduced, and compared with the conventional cruise system, the system is safer in structure and simpler in operation.

2. Under complex road conditions, the invention can adjust the speed of the vehicle in real time according to the road conditions, and does not have the limit of the lowest speed like a cruise system, and when a driver performs a series of actions such as acceleration, deceleration, braking, steering and the like based on the road surface, or the actions are combined, the function of limiting the peak value of the vehicle speed by the speed limiting system can not be removed, and the defect that the cruise system is frequently operated due to external factors is avoided.

3. The speed limiting system is structurally characterized in that a functional component for directly limiting the lowest power output is not arranged in the speed limiting system, the lowest speed per hour of the vehicle depends on the state of a generating device of an acceleration electric signal, when the speed limiting system component or a connecting component has a fault, the speed limiting function is lost, compared with the structure component in the prior art, the speed out-of-control condition is reduced with higher probability, and therefore, the speed limiting system is safer compared with the prior art.

4. When the three-stage speed limiting system fails, the control program of the electronic control unit is preferentially executed, so that the danger of vehicle runaway caused by the failure of the speed limiting system is reduced.

Drawings

FIG. 1 is a flow chart of a three-stage speed limit control for a vehicle;

FIG. 2 is a block diagram of a three-level speed limit control system for a vehicle;

FIG. 3 is a schematic structural diagram of a speed compensation module arranged according to the three-level speed limiting system.

Detailed Description

The following describes the safety control system of the vehicle according to the present invention with reference to the accompanying drawings.

Fig. 2 shows a schematic structural diagram of a three-stage speed limit control system of a vehicle provided by the embodiment. The control system includes: a request signal generating part 1, a speed limit value obtaining module 2, a speed limit part 5, an electronic control unit 6, an electronic throttle 4, a position sensor 41 and a power source 8.

When the power source of the target vehicle is an internal combustion engine, the speed limiting part 5 controls the power output of the vehicle by controlling the fuel injection quantity of the engine, so as to realize the speed limiting function of the vehicle.

When the power source of the target vehicle is the motor, the speed-limiting part 5 controls the power output of the vehicle by controlling the motor driving power supply, thereby realizing the speed-limiting running function of the vehicle.

The request signal generating part 1 is used for selecting the entering and exiting of a speed-limiting control system, wherein the speed-limiting function mode comprises a manual speed-limiting mode and a positioning speed-limiting mode.

The speed limit value acquisition module 2 is used for acquiring a speed limit value.

The speed limiting part 5 comprises a vehicle speed signal transmitted by a vehicle speed sensor 11 for acquiring a real-time vehicle speed value of the vehicle, and the speed limiting part 5 is used for sending a control instruction after comprehensive processing and calculation according to the function mode selected by the request signal generating part 1 and combining the real-time vehicle speed value and the speed limiting value so as to realize the automatic speed limiting function of the vehicle. And the electronic control unit 6 controls the vehicle to run based on the control instruction.

The connection mode of the speed limiting part 5 and the electronic control unit 6 is divided into two types:

in a first mode, the speed limiting part 5 is connected in series in a signal transmission line between a functional sensor required by the speed limiting function and an electronic control unit, the speed limiting part 5 modifies a sensor signal of a corresponding function, and the electronic control unit 6 realizes the speed limiting function of the vehicle based on the modified control signal; when the speed limiting function quits, the position signal received by the speed limiting part directly controls the vehicle to run.

And in the second mode, the electronic control unit and the speed limiting part are connected in parallel, the electronic control unit reads position signals required by the speed limiting function at the same time, when the speed limiting function operates, the electronic control unit preferentially reads the position signals transmitted by the speed limiting part 5 to operate the speed limiting function of the vehicle, and when the speed limiting function quits, the electronic control unit directly reads the position signals to control the vehicle to run.

As shown in fig. 1, when the three-stage speed limit control system is turned on, the speed limit control is divided into three stages:

first-stage normality stage: when the real-time vehicle speed is less than the target speed limit value, the electronic control unit 6 directly controls the power output state of the target vehicle based on the received position signal;

the second stage speed limiting stage: when the target vehicle reaches the target speed limit value through acceleration, the speed limit part 5 autonomously modifies the position signal generated by the position sensor 41 and received by the electronic control unit 6 by acquiring and receiving data comparison between the real-time vehicle speed and the target speed limit value, so that the speed per hour of the target vehicle does not exceed the target speed limit value;

when the position signal generated by the position sensor 41 exceeds the upper limit of the real-time speed limiting signal set by the three-stage speed limiting system, the temporary acceleration requirement of the driver is proved, the three-stage speed limiting system enters a third-stage free acceleration stage from a second speed limiting stage, the electronic control unit 6 controls the target vehicle to accelerate gradually according to the current power output based on the position electric signal processed by the speed limiting part 5 until the real-time speed of the target vehicle is reduced to the target speed limiting value again, the three-stage speed limiting system enters a second stage from the third stage again, and when the target vehicle speed is lower than the target speed limiting value, the three-stage speed limiting system enters a first stage from the second stage so as to circularly control the target vehicle to run until the driver exits the three-stage speed limiting system through the function button setting of the request signal generating.

The speed restriction portion 5 is configured to: and under the state that the three-stage speed limiting system is started, the real-time speed and the target speed limiting value are compared in real time through the speed limiting part 5, when the real-time speed is less than, equal to, greater than or exceeds the upper limit of a real-time speed limiting signal, the steps are repeated to control the vehicle to run, the speed limiting part 5 outputs a control electric signal according to the setting of the speed limiting system, and the electronic control unit 6 controls the vehicle to run according to the control mechanism of the three-stage speed limiting system based on the received acceleration electric signal. When the speed limit part 5 obtains that the real-time speed value of the vehicle is not greater than the speed limit value through data comparison, the electric signal change output by the position sensor 41 directly acts on the electronic control unit 6, and at the moment, the electronic throttle 4 is in a normal electronic throttle mode and is in a first-stage normal state of the three-stage speed limit system; continuously stepping on the electronic accelerator 4, when the speed limiting part 5 obtains a vehicle real-time speed value reaching a target speed limiting value through data comparison, the speed limiting part automatically modifies a position signal output to the electronic control unit 6 at the moment, the speed limiting part 5 sends a control instruction through data comparison, the electronic control unit 6 enables the vehicle real-time speed value not to exceed the speed limiting value based on the processed position signal, and the second-stage speed limiting stage of the three-stage speed limiting system is realized at the moment; when the vehicle is in the second speed limit state, the stepping angle of the electronic accelerator 4 is in the allowable fluctuation range, and the real-time vehicle speed changes, the speed compensation module 21 corrects the position signal output to the electronic control unit 6 in real time based on the comparison data, so that the real-time vehicle speed is close to the highest target speed limit value, the operation frequency of a driver is reduced, the stability of the real-time vehicle speed in the interval is saved, and the driving experience and the economical efficiency are improved. For example, the target vehicle state is configured to be that the speed limit value is 60km/h, the real-time power source 8 is internal combustion engine power, the automatic transmission vehicle has the current real-time vehicle speed of 60km/h, and is the second stage speed limit stage of the speed limit system, the road surface state is an uphill road section, the stepping angle fluctuation of the electronic accelerator is in the allowable range along with the gradual increase of the vehicle driving resistance, the intention of the driver for changing the current vehicle speed is proved, if the position signal output to the electronic control unit 6 is continuously limited to be unchanged as the position signal before the uphill, the vehicle driving speed is inevitably and gradually reduced and is lower than the speed limit value, in order to solve the problem, the second stage speed limit stage of the speed limit system is provided with a speed compensation mechanism, when the stepping angle of the electronic accelerator 4 is in the allowable fluctuation range of the system, the driver is proved not to have the intention of changing the real-, the position signal output to the electronic control unit 6 is automatically modified after comprehensive processing and calculation to increase the power output of the vehicle, so that the vehicle speed approaches to the target speed limit value obtained under the speed limit function mode selected by the request signal generating part 1 for driving; for example, the target vehicle state is configured to be that the speed limit value is 60km/s, the real-time power source 8 is internal combustion engine power, the automatic transmission vehicle, the current real-time vehicle speed is 60km/s, the second stage speed limit stage of the speed limit system is provided, the speed limit part 5 judges that the road surface state is a downhill road section through data comparison and power output is unchanged, the position signal output to the electronic control unit 6 is continuously controlled to be unchanged before the downhill along with the gradual reduction of the driving resistance of the vehicle, the driving speed of the vehicle is inevitably increased gradually and exceeds the speed limit value, in order to solve the problem, the second stage speed limit stage of the speed limit system is provided with a speed compensation mechanism, when the position signal of the electronic accelerator 4 is in the fluctuation range allowed by the system, the driver is proved not to change the intention of the real-, the position signal output to the electronic control unit 6 is automatically modified after comprehensive processing and calculation to reduce the power output of the vehicle, so that the vehicle speed approaches to the target speed limit value obtained under the speed limit function mode selected by the request signal generating part 1 for driving;

the speed limiting part 5 is used for obtaining an electric signal change range of the electronic throttle and corresponding position signals of the electronic throttle, when the vehicle is in a second stage speed limiting stage and the corresponding position signal change is higher than a set allowable fluctuation range, the fact that a driver needs to accelerate temporarily is proved, the speed limiting part 5 sends a control instruction based on the position signal change of the electronic throttle, the electronic control unit 6 controls power output to gradually improve output torque according to current real-time power output based on the control instruction, and the third stage speed limiting state of the three-stage speed limiting system is achieved at the moment; when the position signal of the electronic throttle is lower than the position signal of the second stage speed limiting stage, the third stage speed limiting system enters the second stage speed limiting stage again and circulates according to the position signal, for example, the target vehicle is configured as follows: the power source 8 of the target vehicle is electric power, the motor is used as the driving force for driving the vehicle, the speed limit value is set to be 100km/h, the output rotating speed of the real-time motor is 1500r/min, the real-time vehicle speed is 100km/h, the electronic accelerator 4 is continuously stepped on, at the moment, the speed limit system is positioned in the second stage speed limit stage, the speed limit part 5 limits the change of the acceleration electric signal, the output rotating speed of the motor keeps unchanged, so that the vehicle does not exceed the speed limit value for speed limit running, the speed limit part 5 obtains the stepping opening degree of the electronic accelerator to be 35% of the total opening travel through the calculation of the electronic accelerator electric signal, optionally, the speed limit section of the electronic accelerator is +/-5% of the travel opening degree, the electronic accelerator 4 is continuously stepped on, when the travel opening degree of the electronic accelerator 5 reaches 40% of the total travel, the target vehicle is proved to, at the moment, the target vehicle enters a third-stage speed limiting state of the speed limiting system, and the real-time rotating speed of the motor is increased gradually by taking 1500r/min as a base point, so that the vehicle is accelerated gradually.

The electronic control unit 6, namely a vehicle control unit of a power system of a target vehicle, performs operation by acquiring signals of each sensor in real time, and converts the operation result into a control signal, including converting a position signal generated by the electronic throttle 4 into an acceleration signal, comprehensively processing and calculating based on the received control signal, outputting the control signal to control a specific execution component of the target vehicle, and using the processing result for controlling the power output and the driving speed of the vehicle; when the three-level speed limiting system operates, the electronic control unit 6 preferentially reads and executes the position signal parameters from the speed limiting part 5, and further the electronic control unit 6 is also provided with a self-checking module, when the three-level speed limiting system exits or the speed limiting system fails, the control program of the electronic control unit 6 is preferentially executed, the position signal generated by the electronic throttle 4 is directly read, and the running state of the vehicle is controlled to run.

When the request signal generating part 1 is received and the speed limiting system is selected to be exited through the control button, the speed limiting part 5 directly controls the vehicle to normally run. When the request signal generating part 1 is received to select the speed limit function mode and the real-time vehicle speed value is not greater than the speed limit value, the speed limit part 5 directly controls the vehicle to normally run. When the control button is received to select the speed limit function mode and the real-time vehicle speed value is larger than the speed limit value, the speed limit part 5 defaults that the speed limit system is in a third stage free acceleration stage, and the speed limit system does not interfere with the control signal until the real-time vehicle speed is reduced to the target speed limit value. As the electric signal for improving the transition from the second-stage speed limit state to the third-stage speed limit state, an adjusting button for adjusting the allowable fluctuation range of the position signal of the electronic throttle is arranged, and because each driver is not suitable or sensitive to the opening degree of the speed limit interval, acceleration and deceleration results beyond will are easily caused, and a control switch capable of adjusting the opening degree is arranged, the condition can be avoided, so that the action of the speed limit system can meet the selection of different objects; optionally, the button for adjusting the speed limit interval is configured to: the opening of the speed-limiting section is reduced or increased by pressing a key arranged on the instrument desk, the further improvement is that the modified parameters are stored in a storage unit of the speed-limiting part 5, and the speed-limiting system after restarting preferentially uses the last stored parameter setting. Since most vehicle users are relatively fixed, the set parameters are kept in the storage unit, and the step of repeated setting by the users is avoided.

When the target vehicle slides on a steep slope and the real-time speed exceeds the control of the three-level speed limiting system, the driver controls the running state of the vehicle through a braking system configured for the vehicle.

When the vehicle needs to decelerate in time, a driver makes braking action of a corresponding degree through a braking system configured for the vehicle, and the running state of the vehicle is controlled.

The vehicle three-level speed limit control system can autonomously select any one functional mode of a normal running mode, a manual speed limit mode and a positioning speed limit mode according to needs, is flexible to select, can freely switch various control modes, and is convenient and quick; when the positioning speed limiting mode is selected, the vehicle speed can be automatically limited according to the speed limiting value in the GPS positioning module, so that the real-time vehicle speed does not exceed the speed limiting value in the second-stage speed limiting state in the third-stage speed limiting system, the classification limitation of the vehicle speed is completed through the electronic accelerator 4, the operation habit is met, the energy is saved, the violation or accident caused by overspeed is effectively reduced, and meanwhile, the functions of acceleration, deceleration and overspeed prevention of the vehicle are met under the condition that the speed limiting system is not removed.

The system in the embodiment further comprises an electronic throttle 4 and a position sensor 41. The electronic throttle 4 is used for accelerating the vehicle so that the vehicle runs normally. The position sensor 41 is disposed on the electronic accelerator 4, and is configured to acquire a stepping signal of the electronic accelerator 4.

The speed limit value acquisition module 2 comprises a GPS positioning module 32 and a speed setting module 31, wherein the GPS positioning module 32 is used for acquiring a first speed limit value in a navigation map in real time when the vehicle is in a positioning speed limit mode. The speed setting module 31 is used for manually setting a second speed limit value when the vehicle is in the manual speed limit mode. When the vehicle is in the manual speed limiting mode and the positioning speed limiting mode, the speed limiting values are acquired in different modes, so that different speed limiting values need to be acquired in different modes. When the vehicle is in the positioning speed-limiting mode, the speed-limiting value does not need to be input, and the system directly obtains the speed-limiting value from the GPS positioning module. The existing vehicle or mobile phone generally comprises a GPS navigator, so that the second speed limit value can be acquired very conveniently and updated in real time without manual change.

The system in the embodiment also comprises a running instrument 7 which displays the real-time speed and the speed limit value in real time and emits flashing display. The flashing display is performed when the real-time speed of the vehicle is greater than the speed limit value in the speed limit function state. Of course, the flashing display is only a prompt to warn the owner that the driving state of the vehicle needs to be adjusted. As other implementation modes, the alarm and the vibration reminding can be replaced by sending out the alarm and the vibration reminding, or the combination of the three or the coexistence of the three, and the reasonable selection can be carried out according to the actual needs and the cost.

The system also comprises an increase and decrease speed setting key used for increasing or decreasing a second speed limit value of the vehicle in a manual speed limit mode by pressing the key, a speed limit value, namely the second speed limit value, needs to be set in the manual speed limit state, the second speed limit value needs to be manually input into the system, and the size of the second speed limit value can be adjusted according to actual needs.

The request signal generating part 1 is used for sending a control signal to the speed limiting part 5 and controlling the operation of the electronic control unit 6, wherein, a vehicle speed signal is simultaneously connected with the electronic control unit 6.

The speed limit module is used for receiving signals from the speed limit value acquisition module 2, the position sensor 41 and the speed sensor, processing and calculating the signals, and then outputting the signals to the electronic control unit 6 to further send out the control instruction to control the power source 8 to operate.

In a specific embodiment, the governor unit 5 further includes: an input unit 521, a signal acquisition unit 522, a central processing unit 523, a storage unit 101, a human-computer interaction unit 525 and a signal output unit 524. And transmitted to the central processing unit (523); the input unit 521 is used for receiving the speed limiting function status information sent from the request signal generating part 1 and transmitting the information to the central processing unit 523. The signal acquisition unit 522 is configured to receive the electrical signals from the speed limit value acquisition module 2 and the position sensor 41, and transmit the electrical signals to the central processing unit 523. The central processing unit 523 is configured to receive signals from the input unit 521 and the signal acquisition unit 522, process and calculate the signals, and then send the signals. The man-machine interaction unit 525 is used for operating through the vehicle speed and speed limit signals displayed by the running instrument 7, and the storage unit (101) is used for storing the execution parameters set by the man-machine interaction unit (525) and outputting the signals to the central processing unit 523. The signal output unit 524 is configured to receive the signal from the central processing unit 523 and output the signal to the electronic control unit 6.

When the speed-limiting part 5 and the electronic control unit 6 are connected in series, and when the system is in exit or close, the speed-limiting part 5 has no speed-limiting control function on the electronic control unit 6, and only receives a signal from the electronic throttle 4 and then directly transmits the signal to the electronic control unit 6, so that the electronic control unit 6 accelerates or decelerates the vehicle along with the signal of the electronic throttle 4. When the vehicle starts the manual speed limiting mode, the speed limiting part 5 receives a second speed limiting value from the speed setting module 31, compares the real-time vehicle speed with the second speed limiting value, synthesizes the position signal of the electronic throttle 4 and controls the vehicle to run according to the control mode of the three-level speed limiting system; when the vehicle selects the positioning speed-limiting mode, the target speed-limiting value can update the speed-limiting value in real time according to the change of the road position information, and the allowable fluctuation range of the position signal of the target speed-limiting value is synchronously updated corresponding to the stepping angle of the electronic throttle 4 corresponding to the speed-limiting value updated in real time.

The speed limiting part 5 receives a first speed limiting value from the GPS positioning module 32, when the power source 8 of the target vehicle uses an internal combustion engine as the power of the target vehicle, if the real-time vehicle speed is greater than the first speed limiting value, the speed limiting part 5 sends an instruction to the electronic control unit 6, and the electronic control unit 6 is controlled to reduce the fuel injection amount until the real-time vehicle speed is not greater than the first speed limiting value.

When the real-time speed of the target vehicle is in the second stage, the acceleration electric signal is limited by the speed limit part 5 and comprises a critical acceleration value range from the second speed limit stage to the third speed limit stage, the real-time speed signal acquired by the vehicle speed sensor 11 is compared with the speed limit value acquired by the speed limit value acquisition module 2, the increase or decrease of the vehicle speed is detected, and the information parameter that the vehicle is in a downhill slope or an uphill slope is acquired; when the power source 8 controlled by the speed limiting part 5 is a vehicle powered by an internal combustion engine, the system controls the electronic control unit 6 to increase or reduce the fuel injection quantity of the engine so as to control the real-time vehicle speed to approach the target speed limiting value; when the speed limiting part 5 controls a vehicle with a motor as a power source 8, a real-time vehicle speed signal acquired by a vehicle speed sensor 11 is compared with a target speed limiting value acquired by a speed limiting value acquisition module 2 to detect the increase or decrease of the vehicle speed to acquire information parameters of the vehicle on a downhill or uphill, if the treading angle corresponding to an acceleration signal does not exceed the allowable fluctuation range at the moment, the system proves that a driver does not have the intention of changing the vehicle speed, the system increases or decreases the output torque of the motor through a power compensation mechanism to enable the highest vehicle speed of the vehicle to approach to the speed limiting value and the highest vehicle speed of the vehicle to approach to the speed limiting value;

when the speed limit instruction is not sent, the vehicle directly controls the electronic control unit 6 to operate according to the electronic throttle 4. And the speed limit value of the manual speed limit mode is manually set. The speed limit value of the positioning speed limit mode is directly from the speed limit value in the GPS positioning module 2.

The speed limit instruction is not issued, and (1) the vehicle is in a normal running mode. Or (2) the vehicle is in a general speed limiting mode, and the real-time vehicle speed is not greater than the manually set speed limiting value in the manual speed limiting mode; or (3) the vehicle is in a positioning speed-limiting mode, and the real-time vehicle speed is not greater than the limited speed-limiting value in the vehicle-mounted GPS positioning module 32; or (4) when the speed limit system is started, the real-time speed is greater than the target speed limit value until the real-time speed does not exceed the target speed limit value. When no instruction is given, the vehicle runs normally, and the driver steps on the electronic accelerator 4 to control the speed of the vehicle.

The power source 8 is a target vehicle tractive effort producing assembly including, but not limited to, an internal combustion engine and an electric motor.

When the real-time power of the power source 8 is an internal combustion engine, the speed-limiting part 5 controls the power output of the vehicle by controlling the fuel injection quantity of the engine, so as to realize the speed-limiting running of the vehicle.

When the real-time power of the power source 8 is the motor, the speed-limiting part 5 controls the power output of the vehicle by controlling the motor to drive the power source, so as to realize the speed-limiting running of the vehicle.

The workflow control logic of the vehicle active speed limiting control system is as follows: and after the vehicle power supply is switched on, the system performs self-checking, and if no system fault exists, the system enters a three-stage speed-limiting control system. And manually selecting a function mode, selecting whether to enter a speed limiting function mode, and if not, driving the vehicle to normally run by an electronic control unit 6 driven by an acceleration signal acquired by the electronic accelerator 4. When the speed limiting function mode is selected, two speed limiting function modes of a manual speed limiting mode and a positioning speed limiting mode can be provided. If the manual speed limit mode is selected, a second speed limit value is manually input.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. The utility model provides a tertiary speed limit control system of vehicle, includes request signal generation portion (1), speed limit value acquisition module (2), speed limit portion (5), speed sensor (11), electronic throttle (4), electronic control unit (6), its characterized in that:

the request signal generating part (1) is provided with a function button for selecting the entering and exiting of the speed limiting function mode, and the speed limiting function mode comprises a manual speed limiting mode and a positioning speed limiting mode;

the speed limiting part (5) receives a control instruction of the request signal generating part (1) and is used for selecting a speed limiting function mode and operation of the vehicle three-level speed limiting control system;

the speed limit value acquisition module (2) is used for acquiring a real-time speed limit value;

the vehicle speed sensor (11) is used for generating a vehicle speed signal to acquire a real-time vehicle speed value;

the electronic accelerator (4) is provided with a position sensor (41) for generating a position signal and controlling the power output of a target vehicle, and the position signal generated by the position sensor (41) corresponds to the stepping angle of the electronic accelerator (4) and is used for judging the next operation of a driver;

when receiving the request signal generating part (1) to select to enter a corresponding speed limiting mode, the speed limiting part (5) is configured to:

the method comprises the steps of receiving a position signal generated by a position sensor (41) in real time, judging the next operation of a driver, reading real-time data of a speed limit value acquisition module (2) in real time to determine a speed limit value according to a function mode selected by a request signal generation part (1), processing and calculating by combining a real-time vehicle speed value and the speed limit value, and autonomously modifying the position signal generated by the position sensor (41) input to an electronic control unit (6), wherein the electronic control unit (6) carries out operation and processing based on the position signal processed by the speed limit part (5) to control a vehicle to run according to a three-level speed limit system control logic so as to realize the speed limit of the vehicle;

when the real-time vehicle speed is lower than the speed limit value, the parameter change of the position signal directly controls the vehicle running speed, and the vehicle is in a first-stage normal state stage of the three-stage speed limit system;

when the real-time speed reaches the speed limit value, the speed limit part (5) automatically modifies the parameter value of the position signal generated by the position sensor 41, so that the real-time speed does not exceed the speed limit value, and the vehicle is in the second stage speed limit stage of the three-stage speed limit system;

when the real-time speed reaches a speed limit value and the tread angle corresponding to the position signal generated by the electronic throttle (4) exceeds the allowable span, the driver is proved to need to control the vehicle to accelerate, the speed limit part (5) automatically modifies the position signal parameter value generated by the position sensor 41 output to the electronic control unit (6) to control the vehicle to accelerate gradually, and at the moment, the vehicle is in the third stage of the acceleration stage of the three-stage speed limit system.

2. The vehicle three-level speed limit control system according to claim 1, characterized in that: when the request signal generating part (1) is received to select to enter a corresponding speed limiting mode, the electronic control unit (6) receives a control instruction of the speed limiting part (5) and controls the vehicle to run;

the speed-limiting section (5) is configured to:

when the target vehicle does not enter the speed-limiting function mode, the position signal generated by the electronic throttle (4) changes, the position signal is directly input to the electronic control unit (6) through the speed-limiting part (5), and the electronic control unit (6) converts the position signal into an acceleration signal to directly control the power output of the target vehicle;

step two, when the request signal generating part (1) selects to enter the speed limit function mode and the real-time vehicle speed is less than the speed limit value acquired by the speed limit value acquiring module (2), the position signal is directly input to the electronic control unit (6) through the speed limit part (5), and the electronic control unit (6) converts the position signal generated by the position sensor 41 into an acceleration signal to directly control the power output of the target vehicle; at the moment, the vehicle is in a first stage normal state stage of the three-stage speed limiting system;

step three, when the real-time vehicle speed reaches the speed limit value acquired by the speed limit value acquisition module (2), the speed limit part (5) integrates the position information of the electronic throttle (4), autonomously modifies the position signal output to the electronic control unit (6), the electronic control unit (6) receives the modified position signal, so that the speed per hour of the target vehicle does not exceed the target speed limit value, and the vehicle is in the second stage speed limit stage of the three-stage speed limit system;

and fourthly, when the stepping angle of the electronic throttle (4) exceeds the allowable span range set in the speed limiting stage, proving that the driver needs to accelerate temporarily, wherein the speed limiting part (5) synthesizes the position information of the electronic throttle (4), autonomously modifies the position signal output to the electronic control unit (6), takes the position signal output to the electronic control unit (6) by the current speed limiting part (5) as a base point, synthesizes the further change of the stepping angle of the electronic throttle (4), controls the target vehicle to continuously and gradually increase the real-time vehicle speed, and enables the real-time vehicle speed of the target vehicle to exceed the target speed limiting value, and the vehicle is in the third stage of the third-stage speed limiting system at the moment.

3. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that: the connection modes of the speed limiting part (5) and the electronic control unit (6) are selectively divided into serial connection and parallel connection;

the speed limiting part (5) is connected in series with a signal transmission line of the sensor and the electronic control unit;

the electronic control unit and the speed limiting part are connected in parallel, the electronic control unit and the speed limiting part read position signals required by a speed limiting function at the same time, when the speed limiting part (5) and the electronic control unit are connected in parallel, when the three-level speed limiting system operates, the electronic control unit (6) preferentially reads and executes control signals transmitted by the speed limiting part (5).

4. The vehicle three-level speed limit control system according to claim 1, characterized in that: the speed limit value acquisition module (2) comprises a GPS positioning module (32) and a speed setting module (31), wherein the GPS positioning module (32) is used for acquiring a first speed limit value of the GPS positioning module (32) in real time when the vehicle is in a positioning speed limit mode; the speed setting module (31) is used for manually setting a second speed limit value when the vehicle is in a manual speed limit mode.

5. The vehicle three-level speed limit control system according to claim 2, characterized in that: in the third step, when the vehicle is in a speed limiting stage and the real-time vehicle speed reaches a speed limiting value, the speed limiting part (5) synthesizes the treading angle of the electronic throttle (4) and is in a span range allowing fluctuation, and the third-stage speed limiting system judges that the driver wants to keep driving at the speed limiting value, and controls a position signal which is configured as follows: when the real-time vehicle speed is lower than a speed limit value, a position signal generated by a position sensor 41 directly controls the power output of a vehicle, when the real-time vehicle speed reaches the speed limit value, a speed limit part autonomously modifies the position signal output to an electronic control unit (6) to enable the vehicle not to exceed a target speed limit value, when the stepping action of an electronic throttle (4) is increased and the position signal generated by the position sensor 41 and received by the speed limit part (5) exceeds the upper limit of the allowable fluctuation span in a speed limit stage, the fact that a driver needs to temporarily accelerate is proved, and the speed limit part (5) autonomously modifies the position signal output to the electronic control unit (6) to enable the target vehicle to gradually accelerate; wherein, the allowable fluctuation span of the position signal generated by the position sensor 41 refers to that the three-stage speed limiting system corresponds to the stepping angle of the electronic throttle (4) according to the position signal generated by the position sensor 41, the acceleration signal generated by the stepping angle correspondingly generates a relative driving speed, the position information of the electronic throttle (4) corresponding to the real-time speed is determined according to the parameter, the three-stage speed limiting system judges the next operation of the driver by setting the fluctuation range of the acceleration signal and integrating the stepping angle of the electronic throttle (4), when the real-time vehicle speed reaches the speed limiting value, the certain angle fluctuation of the electronic throttle (4) is allowed, the parameter basis of the mutual transition between the second stage and the third stage in the three-stage speed limiting system is determined according to the fluctuation range, when the fluctuation angle of the electronic throttle is lower than the allowable fluctuation range, the driver is proved to need to control the vehicle to decelerate, and at the moment, the electronic accelerator treading angle directly controls the real-time vehicle speed until the real-time vehicle speed reaches the speed limit value again, and the steps are repeated to control the vehicle running state.

6. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that: when the real-time speed of the target vehicle is reduced to the speed limit value again, the system enters a second-stage speed limit stage from a third-stage successive acceleration stage again, and when the target vehicle speed is lower than the speed limit value, the third-stage speed limit system enters a first-stage normal state stage from the second-stage speed limit stage, so that the target vehicle is controlled to run circularly until a driver sets and exits the speed limit system through a function button of the request signal generating part (1);

when the request signal generating part (1) is received, the speed limiting function mode is selected through a control button, if the real-time vehicle speed value is larger than the speed limiting value, the third-level speed limiting system does not interfere with the control signal until the real-time vehicle speed does not exceed the target speed limiting value, and the steps are repeated to control the vehicle to run.

7. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that: the speed limiting part (5) is provided with a speed compensation module (21), when the vehicle is in a second stage speed limiting stage and the real-time vehicle speed is changed, the speed compensation module (21) reads that the stepping angle of the electronic throttle (4) is within an allowable fluctuation range to prove that a driver wants to keep the current vehicle speed running, and the speed compensation module (21) correspondingly adjusts the position signal output to the electronic control unit (6) based on the calculation of the position signal of the electronic throttle (4) and the speed limiting value comparison data acquired under the real-time vehicle speed and speed limiting mode to increase or reduce power output so that the real-time vehicle speed approaches the speed limiting value running under the speed limiting function mode selected by the request signal generating part (1).

8. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that: the speed limiting part (5) is also provided with a function button for adjusting the fluctuation range, and is used for adjusting the allowable fluctuation range of the transition between the second-stage speed limiting state and the third-stage relay acceleration state.

9. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that: the speed limit part (5) is also provided with a function button for adjusting the target speed limit value, and the function button is configured to: and adjusting the numerical value of the target speed limit value obtained by the three-stage speed limit system through the selected speed limit function mode by pressing a key arranged on the instrument desk.

10. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that: the modified parameters are stored in a storage unit (101) of the speed limiting part (5), and the restarted speed limiting system preferentially uses the last stored parameter setting.

11. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that: when the real-time speed limit value changes, the three-stage speed limit system naturally generates a current speed limit value and a previous speed limit value, the speed limit value acquisition module (2) transmits a current changed speed limit value signal to a driving instrument for a driver to make the basis of the next operation, at the moment, the three-stage speed limit system executes a control program of the previous speed limit value until the real-time vehicle speed is lower than the previous speed limit value, and the speed limit part (5) repeats the control steps to control the vehicle to run according to the comparison between the current speed limit value and the real-time vehicle speed.

12. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that:

the speed limit portion includes:

the electronic control unit (6) is used for acquiring signals output by functional components equipped in a target vehicle, performing comprehensive processing and calculation, and converting position signals generated by the electronic throttle (4) into corresponding acceleration signals to control the power output of the target vehicle;

and the speed limit module is used for receiving signals from the speed limit value acquisition module (2), the position sensor (41) and the vehicle speed sensor (11), outputting a control signal to the electronic control unit (6) after comprehensive processing and calculation, and comprehensively processing and calculating the power output of the control target vehicle by the electronic control unit (6) based on a control instruction.

13. The vehicle three-stage speed limit control system according to claim 1 or 2, characterized in that:

the speed limit module (51) comprises:

the input unit (521) is used for receiving the speed-limiting function state information sent by the function button of the request signal generating part (1) and transmitting the speed-limiting function state information to the central processing unit (523);

the information acquisition unit (522) is used for receiving signals from the speed limit value acquisition module (2), the position sensor (41) and the vehicle speed sensor (11) and transmitting the signals to the central processing unit (523);

the man-machine interaction unit (525) is used for operating through the signals of the real-time speed and the speed limit value displayed by the running instrument and outputting the signals to the central processing unit (523);

the storage unit (101) is used for storing the execution parameters set by the human-computer interaction unit (525) when the three-level speed limiting system operates, and transmitting the execution parameters to the central processing unit (523);

the central processing unit (523) is used for receiving and executing signals of the input unit (521), the storage unit (101), the human-computer interaction unit (525) and the information acquisition unit (522), processing and calculating output control signals;

a signal output unit (524) for receiving the control signal output from the central processing unit (523) and outputting the signal to an electronic control unit (6).

14. The three-stage speed limit control system for a vehicle according to claim 1 or 2, wherein: the electronic control unit (6) is internally provided with the system self-checking module (30) which is used for collecting control signals of all the functional sensors and data feedback of an execution component, is used for fault self-checking of a target vehicle, displays information corresponding to the fault on a driving instrument and is used as a judgment basis for a driver to perform next operation;

when the system self-checking module (30) checks the three-stage speed limiting system fault, the control program of the electronic control unit (6) is executed preferentially.

15. A three-level speed limit control method for a vehicle comprises the following steps: