CN115675445A - Vehicle control method, system, equipment, storage medium and vehicle based on rear wheels - Google Patents
Vehicle control method, system, equipment, storage medium and vehicle based on rear wheels Download PDFInfo
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- CN115675445A CN115675445A CN202211436479.4A CN202211436479A CN115675445A CN 115675445 A CN115675445 A CN 115675445A CN 202211436479 A CN202211436479 A CN 202211436479A CN 115675445 A CN115675445 A CN 115675445A
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Abstract
The present disclosure provides a vehicle control method, system, device, storage medium and vehicle based on rear wheels, comprising: acquiring vehicle information, and judging the deflection direction of a rear wheel according to the vehicle information to obtain the deflection direction of the rear wheel; obtaining front wheel steering angle information, and determining a rear wheel deflection angle based on a vehicle mass center side deflection angle by using the front wheel steering angle information; and controlling the rear wheel of the vehicle based on the rear wheel deflection direction and the rear wheel deflection angle. The method solves the problems that in the running process of the vehicle, due to factors such as overhigh speed or tire adhesion force change and the like, wheels slip, and the vehicle is under-steered or over-steered.
Description
Technical Field
The present disclosure relates to the field of vehicle control technologies, and in particular, to a method, a system, a device, a storage medium, and a vehicle for controlling a vehicle based on rear wheels.
Background
In the running process of a vehicle, particularly in the running process of a curve, due to factors such as overhigh speed or tire adhesion force change, wheels slip, the problem of insufficient or over-steering of the vehicle is easy to occur, the vehicle is out of control, and safety accidents are caused.
In view of this, how to avoid the problem of vehicle understeer or oversteer and improve driving stability and safety has become an important research problem.
Disclosure of Invention
In view of the above, the present disclosure is directed to a method, a system, a device, a storage medium and a vehicle for controlling a vehicle based on rear wheels, so as to solve the problem of understeer or oversteer when the vehicle is running.
In view of the above object, a first aspect of the present disclosure provides a rear wheel-based vehicle control method, the method including:
acquiring vehicle information, and judging the deflection direction of a rear wheel according to the vehicle information to obtain the deflection direction of the rear wheel;
obtaining front wheel steering angle information, and determining a rear wheel deflection angle based on a vehicle mass center side deflection angle by using the front wheel steering angle information;
and controlling the rear wheel of the vehicle based on the rear wheel deflection direction and the rear wheel deflection angle.
Based on the same inventive concept, a second aspect of the present disclosure proposes a rear wheel-based vehicle control system, comprising:
the information acquisition module is configured to acquire vehicle information and judge the deflection direction of the rear wheel according to the vehicle information to obtain the deflection direction of the rear wheel;
the angle calculation module is configured to acquire front wheel steering angle information and calculate a rear wheel deflection angle according to a rear wheel steering angle relation function, wherein the rear wheel steering angle relation function is calculated by a vehicle two-degree-of-freedom model algorithm;
a rear wheel control module configured to control a rear wheel of the vehicle based on the rear wheel yaw direction and the rear wheel yaw angle.
Based on the same inventive concept, a third aspect of the present disclosure proposes an electronic device comprising a memory, a processor and a computer program stored on the memory and executable by the processor, the processor implementing the method as described above when executing the computer program.
Based on the same inventive concept, a fourth aspect of the present disclosure proposes a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method as described above.
Based on the same inventive concept, a fifth aspect of the present disclosure provides a vehicle including the vehicle-mounted function position complementing system of the second aspect or the electronic device of the third aspect or the storage medium of the fourth aspect.
As can be seen from the foregoing, the present disclosure provides a rear wheel-based vehicle control method, which determines a deflection direction of a rear wheel based on acquired vehicle information, and improves accuracy of the determination; calculating according to a two-degree-of-freedom model algorithm of the vehicle to obtain a rear wheel steering angle relation function, and calculating the rear wheel steering angle of the vehicle based on the obtained front wheel steering angle and the calculated rear wheel steering angle relation function, so that the calculation result is more accurate; the rear wheels of the vehicle are controlled based on the deflection direction of the rear wheels and the deflection angle of the rear wheels, and the rear wheels of the vehicle are correspondingly adjusted through the scheme under the condition that the vehicle is under-steered or over-steered, so that the steering condition of the vehicle is controlled, and the stability of the vehicle and the driving safety are improved.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a rear wheel based vehicle control method according to an embodiment of the present disclosure;
FIG. 2 is a first partial flowchart of an embodiment according to another application scenario of the present disclosure;
FIG. 3 is a second flowchart of an embodiment according to another application scenario of the present disclosure;
FIG. 4 is a block diagram of a rear wheel based vehicle control system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by one having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
As described above, during the running of the vehicle, particularly when running on a curve, there is a problem that the vehicle is under-steered or oversteered due to the slipping of the wheels caused by the excessively high vehicle speed or the variation of the tire adhesion.
Based on the above description, the present embodiment proposes a rear wheel-based vehicle control method, as shown in fig. 1, the method including:
In specific implementation, vehicle information is acquired, wherein the vehicle information comprises vehicle basic information and vehicle running information, and the vehicle basic information comprises at least one of the following information: vehicle mass or vehicle tire information, the vehicle operation information including at least one of: vehicle corner information, vehicle running speed or vehicle gear information. Judging the deflection direction of the rear wheels according to the vehicle information to obtain a rear deflection direction, judging to obtain a vehicle state according to the vehicle information, and determining the reverse deflection of the rear wheels and the front wheels of the vehicle in response to the fact that the vehicle is in an understeer state; in response to the vehicle being in an oversteer condition, it is determined that the rear wheels of the vehicle are deflecting in the same direction as the front wheels. According to the scheme, the deflection direction of the rear wheel is judged based on the acquired vehicle information, so that the judgment accuracy is improved, meanwhile, the deflection angle of the rear wheel is obtained based on the deflection direction of the rear wheel and subsequent calculation, the adjustment of the deflection of the vehicle by adjusting the rear wheel of the vehicle is realized, and the stability of the vehicle in the driving process is improved.
And 102, acquiring front wheel steering angle information, and determining a rear wheel deflection angle based on a vehicle mass center side deflection angle by using the front wheel steering angle information.
In specific implementation, front wheel steering angle information is obtained through a vehicle steering wheel, the front wheel steering angle information comprises a vehicle front wheel deflection angle, and a rear wheel steering angle relation function is obtained through calculation based on a vehicle two-degree-of-freedom model algorithm. And obtaining the deflection angle of the rear wheel of the vehicle according to the deflection angle of the front wheel of the vehicle and the relation function of the rear wheel rotation angle. According to the scheme, the rear wheel steering angle relation function is calculated according to the vehicle two-degree-of-freedom model algorithm, the vehicle rear wheel deflection angle is calculated based on the obtained front wheel deflection angle and the calculated rear wheel steering angle relation function, the calculation result is more accurate, the vehicle deflection is adjusted together with the rear wheel deflection direction determined in the step, and the driving safety is improved.
And 103, controlling the rear wheels of the vehicle based on the rear wheel deflection direction and the rear wheel deflection angle.
When the method is specifically implemented, the deflection direction of the rear wheel and the deflection angle of the rear wheel are sent to a controller, and the controller controls the rear wheel of the vehicle based on control information, wherein the control information comprises the deflection direction of the rear wheel and the deflection angle of the rear wheel, so that the driving smoothness is improved, and the safety risk in driving is reduced.
By the scheme, the deflection direction of the rear wheel is judged based on the acquired vehicle information, so that the judgment accuracy is improved; calculating according to a two-degree-of-freedom model algorithm of the vehicle to obtain a rear wheel steering angle relation function, and calculating the rear wheel steering angle of the vehicle based on the obtained front wheel steering angle and the calculated rear wheel steering angle relation function, so that the calculation result is more accurate; the rear wheels of the vehicle are controlled based on the deflection direction of the rear wheels and the deflection angle of the rear wheels, and the rear wheels of the vehicle are correspondingly adjusted through the scheme under the condition that the vehicle is under-steered or over-steered, so that the steering condition of the vehicle is controlled, and the stability of the vehicle and the driving safety are improved.
In some embodiments, step 101 specifically includes:
step 1011, obtaining vehicle information, and determining the slip ratio or the slip rotation ratio of the vehicle wheels according to the vehicle information.
In specific implementation, vehicle information is acquired through a sensor, and the vehicle information comprises wheel speed, rolling radius of a tire, longitudinal vehicle speed, gear information, vehicle acceleration information and the like. The vehicle comprises a wheel speed sensor and a vehicle speed sensor, wherein the wheel speed sensor is used for collecting the wheel speed of the vehicle, the vehicle speed sensor is used for collecting the longitudinal vehicle speed of the vehicle, a tire rolling radius map is obtained according to a drum experiment, the tire rolling radius is determined according to the tire pressure and the vehicle speed information of the vehicle, and the slip ratio of the vehicle wheel is calculated through the following formula:
K＝(u-ω·R)/u
wherein K is the slip ratio of the vehicle tire, ω is the wheel speed of the vehicle tire, R is the rolling radius of the vehicle tire, and u is the longitudinal speed of the vehicle;
calculating the slip rate of the vehicle wheels by the formula:
S＝(ω·R-u)/(ω·R)
where S is the slip of the vehicle tire, ω is the wheel speed of the vehicle tire, R is the rolling radius of the vehicle tire, and u is the longitudinal speed of the vehicle.
Through the scheme, the slip rate or the slip rate of the vehicle wheel is calculated and is used for subsequently judging the deflection direction of the rear wheel, so that the judgment is more accurate.
Step 1012, in response to at least one of the vehicle front wheel slip ratio satisfying the first threshold range or the vehicle rear wheel slip ratio satisfying the second threshold range or the vehicle rear wheel slip ratio satisfying the third threshold range or the vehicle rear wheel slip ratio satisfying the fourth threshold range, determining that the vehicle is in an understeer state and the rear wheel deflection direction is in a reverse deflection with respect to the front wheels.
When the method is specifically implemented, the slip rate or the slip ratio of the vehicle wheels is calculated, when the slip rate of at least one front wheel of the vehicle meets a first threshold range or the slip ratio meets a second threshold range, and when the slip rate of a rear wheel of the vehicle meets a third threshold range or the slip ratio meets a fourth threshold range, the vehicle is determined to be in an understeer state, the deflection direction of the rear wheel is determined to be the reverse deflection with the front wheel, so that after the deflection angle of the rear wheel is obtained through calculation in the subsequent steps, the rear wheel is controlled to be adjusted according to the deflection direction of the reverse deflection with the front wheel and the deflection angle of the rear wheel, the slipping-out of the tangential direction of a delay arc line of the head of the vehicle is avoided, and potential safety hazards are reduced.
For example, if the first threshold range is 10% or more, the second threshold range is-10% or less, the third threshold range is 10% or more, and the fourth threshold condition is that the slip ratio is-10% or less, then at least one of the vehicles has a front wheel slip ratio of 10% or more or a slip ratio of-10% or less, and a rear wheel slip ratio of 10% or less or-10% or less, then the vehicle is determined to be in an understeer state, in which the rear wheel is deflected in a direction opposite to the front wheel.
And step 1013, in response to that at least one vehicle rear wheel slip ratio meets a first threshold range or the slip ratio meets a second threshold range, and when a vehicle front wheel slip ratio meets a third threshold range or the slip ratio meets a fourth threshold range, determining that the vehicle is in an oversteer state, and the rear wheel deflection direction is in the same direction as the front wheel deflection.
During specific implementation, the slip rate or the slip ratio of the vehicle wheels is calculated, the vehicle is determined to be in an oversteering state in response to the fact that the slip rate of at least one rear wheel of the vehicle meets a first threshold range or the slip ratio meets a second threshold range and the slip rate of a front wheel of the vehicle meets a third threshold range or the slip ratio meets a fourth threshold range, the deflection direction of the rear wheel is determined to be in the same direction as that of the front wheel, so that after the deflection angle of the rear wheel is calculated in the subsequent step process, the rear wheel is controlled to be adjusted according to the deflection direction in the same direction as that of the front wheel and the deflection angle of the rear wheel, the sliding out of the tangential direction of the rear extension arc line of the vehicle is avoided, and potential safety hazards are reduced.
For example, the first threshold range is 10% or more, the second threshold range is-10% or less, the third threshold range is 10% or more, and the fourth threshold condition is that the slip ratio is-10% or less, then at least one vehicle rear wheel slip ratio is 10% or more or less-10% or less, the front wheel slip ratio is 10% or less-10%, and the vehicle is determined to be in an oversteer state, where the rear wheel deflection direction is the same as the front wheel deflection direction.
In some embodiments, step 1011 specifically includes:
in step 1011A, the vehicle state is determined according to the vehicle information.
In specific implementation, vehicle information is acquired, wherein the vehicle information comprises vehicle running information, vehicle gear information and the like, and the current running state of the vehicle is judged according to the acquired vehicle information, wherein the vehicle running state comprises a driving state or a braking state.
In response to determining that the vehicle state is a driving state, a slip rate of the vehicle wheel is determined according to the vehicle information, step 1011B.
In specific implementation, according to the vehicle running state, in response to the fact that the vehicle running state is determined to be the driving state, the slip rate of the vehicle wheel is calculated according to the information of the wheel speed of the vehicle wheel, the rolling radius of the tire, the longitudinal vehicle speed and the like.
Step 1011C, in response to determining that the vehicle state is a braking state, determining a slip rate of the vehicle wheel according to the vehicle information.
In specific implementation, the vehicle running state comprises a driving state and a braking state; and in response to determining that the vehicle running state is a braking state, calculating the slip rate of the vehicle wheel according to the information of the wheel speed of the vehicle wheel, the rolling radius of the tire, the longitudinal vehicle speed and the like.
By the scheme, the corresponding slip rate or slip ratio is calculated according to different vehicle states, the calculated amount is reduced, the calculation speed is increased, the corresponding control operation on the vehicle wheels can be realized in a shorter time, and the driving safety is improved.
In some embodiments, step 1011A specifically includes:
in step 1011Aa, vehicle acceleration information and gear information are acquired.
During specific implementation, vehicle acceleration information and gear information are obtained through a vehicle internal sensor, and a vehicle state is judged according to the vehicle acceleration information and the gear information, wherein the vehicle state refers to states of a vehicle under different accelerations and different gears, and includes one of the following states: a forward drive state, a forward braking state, a reverse braking state, or a reverse drive state.
And a step 1011Ab of judging the vehicle state according to the vehicle acceleration information and the gear information.
In specific implementation, the direction of the vehicle acceleration pointing to the head of the vehicle is a positive value, the direction pointing to the tail of the vehicle is a negative value, and the vehicle state is determined to be a forward driving state in response to the fact that the gear information is a forward gear and the acceleration information is a positive value; in response to the fact that the gear information is a forward gear and the acceleration information is a negative value, determining that the vehicle state is a forward braking state; in response to the fact that the gear information is a reverse gear and the acceleration information is a positive value, determining that the vehicle state is a reverse braking state; and determining that the vehicle state is a reverse driving state in response to the fact that the gear information is a reverse gear and the acceleration information is a negative value.
According to the scheme, the vehicle state is judged according to the acquired vehicle acceleration information and the acquired vehicle gear information, the slip ratio or slip ratio of the vehicle is calculated according to the judged vehicle state, so that the deflection direction of the rear wheel of the vehicle is judged, the judgment result is more accurate, the vehicle steering is adjusted based on the deflection direction of the rear wheel and the deflection angle of the rear wheel obtained in the subsequent step, and the stability and safety of vehicle operation are improved.
In some embodiments, step 102 comprises: acquiring front wheel steering angle information, and processing the front wheel steering angle information based on a rear wheel steering angle relation function determined by a vehicle mass center side slip angle to obtain a rear wheel steering angle; and the rear wheel steering angle relation function is obtained according to a vehicle two-degree-of-freedom model algorithm.
In specific implementation, vehicle front wheel steering angle information is obtained through a vehicle steering wheel, the vehicle front wheel steering angle information comprises a vehicle front wheel deflection angle, and the vehicle front wheel deflection angle is processed based on a rear wheel steering angle relation function determined by a vehicle mass center side deflection angle to obtain a rear wheel deflection angle; and calculating a two-degree-of-freedom model algorithm of the vehicle to obtain the rear wheel steering angle relation function.
In some embodiments, before step 102, the method specifically further includes:
and 1021, obtaining a vehicle mass center slip angle function according to a vehicle two-degree-of-freedom model algorithm, wherein the vehicle mass center slip angle function comprises a plurality of parameter information, and the mass center slip angle is one of the plurality of parameter information.
When the steering vehicle is used for steering driving, due to the influence of the centripetal force, the tire of the vehicle is added with the cornering force, so that the tire cornering angle is generated, the mass center cornering angle of the whole vehicle is further influenced, the smaller the mass center cornering angle is, the smaller the tire sideslip trend is, and the better the steering stability is. The vehicle operation information comprises the longitudinal vehicle speed, the lateral vehicle speed, the vehicle yaw rate, the vehicle mass center slip angle and the like of the vehicle, and a vehicle mass center slip angle function is obtained based on a vehicle two-degree-of-freedom model algorithm according to the vehicle operation information. The vehicle mass center slip angle function at least comprises the following parameter information: vehicle mass center slip angle, vehicle mass center slip angular velocity, vehicle lateral speed, vehicle acceleration. The vehicle mass center side slip angle function is obtained through calculation according to the scheme, and the rear wheel side slip angle is obtained through calculation according to the function, so that the vehicle is controlled, the side slip trend of the tire is weakened, and the driving smoothness is improved.
In some embodiments, step 1021 specifically includes:
based on a vehicle two-degree-of-freedom model algorithm, a vehicle mass center slip angle function is obtained and expressed as:
wherein m is the vehicle mass, a is the distance from the center of mass to the front axle, b is the distance from the center of mass to the rear axle, and k 1 Yaw stiffness, k, of the front axle 2 Is the cornering stiffness of the rear axle, delta 1 For front wheel deflection angle, delta 2 Is the rear wheel deflection angle, u is the longitudinal vehicle speed, v is the lateral vehicle speed,
is the vehicle acceleration, beta is the vehicle mass center slip angle, omega r Is the vehicle yaw rate.
And 1022, determining a rear wheel steering angle relation function based on the vehicle mass center side slip angle function when the plurality of parameter information meet preset conditions.
In specific implementation, according to the obtained vehicle mass center side slip angle function, when the parameter information meets the preset condition, a rear wheel steering angle relation function is obtained.
According to the scheme, the rear wheel steering angle relation function is obtained through calculation of the vehicle mass center side slip angle function, and the rear wheel deflection angle is obtained through calculation based on the rear wheel steering angle relation function in the execution process of the subsequent steps, so that the rear wheel deflection angle is more accurate.
In some embodiments, step 1022 specifically includes:
based on the vehicle centroid side slip angle function, the plurality of parameter information meeting preset conditions comprises: the centroid slip angle is zero and the acceleration is zero; determining a rear wheel steering relationship function expressed as:
during the running process of the vehicle, preferably when the vehicle runs on a curve, the front wheel state comprises an uncontrolled state or a non-uncontrolled state.
The method comprises the steps of obtaining stress information of a vehicle tire, determining that a front wheel of the vehicle is in an out-of-control state when the tire is stressed to break through a friction circle, executing the steps of the embodiment, and adjusting the deflection of the vehicle by adjusting the deflection direction of a rear wheel of the vehicle and the deflection angle of the rear wheel.
And when the stress of the tire does not break through the friction circle, determining that the front wheel of the vehicle is in a non-runaway state, executing the steps of the embodiment, and adjusting the deflection of the vehicle by adjusting the deflection direction of the rear wheel of the vehicle and the deflection angle of the rear wheel. Alternatively, the first and second electrodes may be,
when the tire is stressed and does not break through the friction circle, determining that the front wheel of the vehicle is in a non-runaway state, and executing the steps of the following embodiment, wherein the front wheel and the rear wheel of the vehicle are adjusted to realize the adjustment of the deflection of the vehicle, and the steps comprise:
and step 10A, acquiring an actual deflection angle of a front wheel, performing operation processing on the actual deflection angle of the front wheel to obtain an expected deflection angle of the front wheel, and controlling the front wheel of the vehicle according to the expected deflection angle of the front wheel.
In specific implementation, the acquired vehicle information includes an actual deflection angle of the front wheel, a front wheel steering angle control coefficient is acquired, and the expected deflection angle of the front wheel is obtained by performing operation processing on the actual deflection angle of the front wheel and the front wheel steering angle control coefficient. The actual deflection angle of the front wheel is the deflection angle of the current front wheel of the vehicle obtained through a steering wheel; the front wheel steering angle control coefficient is a coefficient reflecting the relation between the actual deflection angle of the front wheel and the expected deflection angle of the front wheel, can be obtained by table lookup and is related to the vehicle speed and the average slip ratio of the front wheel of the vehicle or the average slip ratio of the front wheel; the desired yaw angle of the front wheels is a yaw angle required for the front wheels when the front wheels are controlled in order to ensure the stability of the vehicle when the vehicle is steered.
And step 10B, adjusting the rear wheels of the vehicle, wherein the adjusting step is the same as the step of the embodiment.
Based on the same inventive concept, in response to the vehicle being in a driving state, another embodiment of the present disclosure in an application scenario is shown in fig. 2, and includes:
in step 201, vehicle information is acquired.
In specific implementation, an ECU (Electronic Control Unit) is used for monitoring and acquiring vehicle information, wherein the vehicle information includes basic vehicle information, vehicle running information, front wheel steering angle information and the like, the basic vehicle information includes vehicle mass, vehicle tire information and the like, the vehicle running information includes vehicle steering angle information, vehicle running speed, vehicle gear information and the like, and the front wheel steering angle information is acquired through a steering wheel. By means of the scheme, the rear wheel deflection direction is judged in the subsequent steps based on the acquired vehicle information, and the judgment accuracy is improved.
And step 202, judging vehicle gear information.
During specific implementation, vehicle gear information is acquired through a vehicle internal sensor, wherein the gear information comprises a forward gear (D gear) and a reverse gear (R gear), and a basis is made for subsequent judgment of the deflection direction of the rear wheel of the vehicle.
And step 203, judging the running state of the vehicle according to the longitudinal acceleration information of the vehicle.
In specific implementation, a vehicle speed sensor is arranged in the vehicle, the longitudinal vehicle speed of the vehicle is acquired through the vehicle speed sensor, the longitudinal acceleration of the vehicle is calculated according to the acquired longitudinal vehicle speed of the vehicle, and the running state of the vehicle is judged according to the longitudinal acceleration information of the vehicle, wherein the running state of the vehicle comprises a driving state and a braking state. According to the scheme, the running state of the vehicle is judged according to the longitudinal acceleration information of the vehicle, and in the subsequent step, the slip rate of the vehicle wheels is calculated in response to the fact that the running state of the vehicle is a driving state; and responding to the fact that the vehicle running state is a braking state, calculating the slip rate of the vehicle wheels for subsequent judgment of the deflection direction of the rear wheels of the vehicle.
And step 204, calculating the slip rate of the vehicle wheels.
In specific implementation, vehicle information is acquired through a sensor, and the vehicle information comprises wheel speed, rolling radius of a tire, longitudinal vehicle speed, gear information, vehicle acceleration information and the like. The vehicle comprises a wheel speed sensor and a vehicle speed sensor, the wheel speed sensor is used for collecting the wheel speed, the vehicle speed sensor is used for collecting the longitudinal vehicle speed of the vehicle, a tire rolling radius map is obtained according to a rotary drum experiment, and the tire rolling radius is determined according to the tire pressure and the vehicle speed information of the vehicle. And calculating the slip rate or the slip rate of the vehicle wheels according to the vehicle information, and judging the deflection direction of the rear wheels according to the calculated slip rate. Calculating the slip rate of the vehicle wheels by the formula:
S＝(ω·R-u)/(ω·R)
where S is the slip ratio of the vehicle tire, ω is the wheel speed of the vehicle tire, R is the rolling radius of the vehicle tire, and u is the longitudinal speed of the vehicle.
And step 205, judging the deflection direction of the rear wheel according to the slip ratio of the vehicle wheel.
In specific implementation, the vehicle state is judged according to the calculated slip rate of the vehicle wheels, wherein the vehicle state refers to the running state of the vehicle in the current state and comprises an understeer state and an oversteer state. According to the scheme, the deflection direction of the rear wheel is judged through the slip ratio obtained through calculation, the control of the rear wheel of the vehicle is realized together with the deflection angle of the rear wheel obtained in the following step, the judgment result is more accurate, and the driving safety is improved.
In some embodiments, step 205 specifically includes:
In specific implementation, by judging that the slip ratio of the vehicle wheels is satisfied, the slip ratio of at least one front wheel of the vehicle is calculated to be less than or equal to minus 10%, then the slip ratio of at least one rear wheel of the vehicle is calculated to be less than or equal to minus 10%, the vehicle is determined to be in an understeer state, the deflection direction of the rear wheel is determined to be the reverse deflection with the front wheel, so that the deflection angle of the rear wheel is obtained through calculation in the subsequent step process, the rear wheel is controlled to be adjusted according to the deflection direction of the reverse deflection with the front wheel and the deflection angle of the rear wheel, the slipping-out of the head of the vehicle along the tangential direction of an arc line is avoided, and potential safety hazards are reduced.
And step 2052, in response to that the slip ratio of the rear wheel of at least one vehicle is calculated to be less than or equal to minus 10 percent, and then the slip ratio of the front wheel of at least one vehicle is calculated to be less than or equal to minus 10 percent, determining that the vehicle is in an oversteer state, and the deflection direction of the rear wheel is the same as that of the front wheel.
During specific implementation, by judging that the slip rates of the vehicle wheels meet, the slip rate of at least one rear wheel of the vehicle is calculated to be less than or equal to-10%, then the slip rate of at least one front wheel of the vehicle is calculated to be less than or equal to-10%, the vehicle is determined to be in an oversteered state, the deflection direction of the rear wheel is determined to be deflected in the same direction as the front wheel, so that the deflection angle of the rear wheel is calculated in the subsequent step process, the rear wheel is controlled to be adjusted according to the deflection direction deflected in the same direction as the front wheel and the deflection angle of the rear wheel, the tangential direction sliding of a rear extension arc line of the vehicle is avoided, and potential safety hazards are reduced.
And step 2053, determining the deflection direction of the rear wheel according to the slip rate of the vehicle wheel.
In specific implementation, the deflection direction of the rear wheel of the vehicle is judged through the slip ratio of the vehicle wheel obtained through calculation, wherein the deflection direction comprises the deflection in the direction opposite to the front wheel and the deflection in the same direction as the front wheel. Determining the deflection direction of the rear wheels to be the reverse deflection of the front wheels in response to judging that the vehicle is in an understeer state according to the slip rate of the vehicle wheels; and in response to the fact that the vehicle is judged to be in an oversteer state according to the slip rate of the vehicle wheels, the deflection direction of the rear wheels is determined to be the same as the deflection direction of the front wheels, and the judgment result is more accurate.
And step 206, acquiring a front wheel deflection angle.
In specific implementation, front wheel steering angle information is obtained through a vehicle steering wheel, and the front wheel steering angle information contains a vehicle front wheel deflection angle for subsequent calculation of a rear wheel deflection angle.
And step 207, calculating a rear wheel deflection angle based on the front wheel deflection angle.
In specific implementation, a rear wheel steering angle relation function is calculated based on a vehicle two-degree-of-freedom model algorithm. And obtaining the deflection angle of the rear wheel of the vehicle according to the relationship function of the deflection angle of the front wheel of the vehicle and the steering angle of the rear wheel. According to the scheme, the rear wheel steering angle relation function is calculated according to the vehicle two-degree-of-freedom model algorithm, the vehicle rear wheel deflection angle is calculated based on the obtained front wheel deflection angle and the calculated rear wheel steering angle relation function, the calculation result is more accurate, and the driving safety is improved.
And 208, controlling the rear wheels of the vehicle according to the deflection direction of the rear wheels and the deflection angle of the rear wheels.
When the method is specifically implemented, the deflection direction of the rear wheel and the deflection angle of the rear wheel are sent to a controller, and the controller controls the rear wheel of the vehicle based on control information, wherein the control information comprises the deflection direction of the rear wheel and the deflection angle of the rear wheel, so that the driving smoothness is improved, and the safety risk in driving is reduced.
Based on the same inventive concept, in response to the vehicle being in a braking state, another embodiment of the present disclosure in an application scenario is shown in fig. 3, and includes:
in step 301, vehicle information is acquired.
In specific implementation, an ECU (Electronic Control Unit) is used for monitoring and acquiring vehicle information, wherein the vehicle information includes basic vehicle information, vehicle running information, front wheel steering angle information and the like, the basic vehicle information includes vehicle mass, vehicle tire information and the like, the vehicle running information includes vehicle steering angle information, vehicle running speed, vehicle gear information and the like, and the front wheel steering angle information is acquired through a steering wheel. According to the scheme, the subsequent steps are used for judging the deflection direction of the rear wheel based on the acquired vehicle information, so that the judgment accuracy is improved.
During specific implementation, vehicle gear information is acquired through a vehicle internal sensor, wherein the gear information comprises a forward gear (D gear) and a reverse gear (R gear), and a basis is made for subsequent judgment of the deflection direction of the rear wheel of the vehicle.
And step 303, judging the running state of the vehicle according to the longitudinal acceleration information of the vehicle.
In specific implementation, a vehicle speed sensor is arranged in the vehicle, the longitudinal vehicle speed of the vehicle is acquired through the vehicle speed sensor, the longitudinal acceleration of the vehicle is calculated according to the acquired longitudinal vehicle speed of the vehicle, and the running state of the vehicle is judged according to the longitudinal acceleration information of the vehicle, wherein the running state of the vehicle comprises a driving state and a braking state. According to the scheme, the running state of the vehicle is judged according to the longitudinal acceleration information of the vehicle, and in the subsequent step, the slip rate of the vehicle wheels is calculated in response to the fact that the running state of the vehicle is a driving state; and responding to the fact that the vehicle running state is a braking state, calculating the slip rate of the vehicle wheels for subsequent judgment of the deflection direction of the rear wheels of the vehicle.
In specific implementation, vehicle information is acquired through a sensor, and the vehicle information comprises wheel speed, rolling radius of a tire, longitudinal vehicle speed, gear information, vehicle acceleration information and the like. The vehicle comprises a wheel speed sensor and a vehicle speed sensor, the wheel speed sensor is used for collecting the wheel speed, the vehicle speed sensor is used for collecting the longitudinal vehicle speed of the vehicle, a tire rolling radius map is obtained according to a rotary drum experiment, and the tire rolling radius is determined according to the tire pressure and the vehicle speed information of the vehicle. And calculating the slip rate or slip ratio of the vehicle wheels according to the vehicle information, and judging the deflection direction of the rear wheels according to the calculated slip rate. Calculating the slip ratio of the vehicle wheel by the following formula:
K＝(u-ω·R)/u
where K is the slip ratio of the vehicle tire, ω is the wheel speed of the vehicle tire, R is the rolling radius of the vehicle tire, and u is the longitudinal speed of the vehicle.
And 305, judging the deflection direction of the rear wheel according to the slip rate of the vehicle wheel.
In specific implementation, the vehicle state is judged according to the calculated slip rate of the vehicle wheels, wherein the vehicle state refers to the running state of the vehicle in the current state and comprises an understeer state and an oversteer state. According to the scheme, the deflection direction of the rear wheel is judged through the slip rate obtained through calculation, the control on the rear wheel of the vehicle is realized together with the deflection angle of the rear wheel obtained in the following step, the judgment result is more accurate, and the driving safety is improved.
In some embodiments, step 305 specifically includes:
3051, in response to calculating that at least one of a slip ratio of front wheels of the vehicle is greater than or equal to 10% and a slip ratio of rear wheels of the vehicle is equal to 10%, determining that the vehicle is in an understeer state and a yaw direction of the rear wheels is a yaw direction opposite to the front wheels.
During specific implementation, by judging that the slip rates of the vehicle wheels are met, the slip rate of at least one front wheel of the vehicle is more than or equal to 10%, and the slip rate of a rear wheel of the vehicle is equal to 10%, the vehicle is determined to be in an under-steering state, the deflection direction of the rear wheel is determined to be in reverse deflection with the front wheel, so that the deflection angle of the rear wheel is obtained through calculation in the subsequent step process, the rear wheel is controlled to be adjusted according to the deflection direction in reverse deflection with the front wheel and the deflection angle of the rear wheel, the slipping of the head of the vehicle in the tangential direction of a delay arc line is avoided, and potential safety hazards are reduced.
And step 3052, in response to calculating that the slip ratio of at least one rear wheel of the vehicle is greater than or equal to 10% and the slip ratio of a front wheel of the vehicle is equal to 10%, determining that the vehicle is in an oversteer state and the deflection direction of the rear wheel is in the same direction as that of the front wheel.
During specific implementation, by judging that the slip rates of the vehicle wheels are met, the slip rate of at least one rear wheel of the vehicle is larger than or equal to 10%, and the slip rate of a front wheel of the vehicle is equal to 10%, the vehicle is determined to be in an oversteering state, the deflection direction of the rear wheel is determined to be in the same direction as that of the front wheel, so that the deflection angle of the rear wheel is obtained through calculation in the subsequent step process, the rear wheel is controlled to be adjusted according to the deflection direction in the same direction as that of the front wheel and the deflection angle of the rear wheel, the slipping-out of the tail of the vehicle in the tangential direction of a delay arc line is avoided, and potential safety hazards are reduced.
And step 3053, determining the deflection direction of the rear wheel according to the slip ratio of the vehicle wheel.
In specific implementation, the deflection direction of the rear wheel of the vehicle is judged through the slip ratio of the vehicle wheel obtained through calculation, wherein the deflection direction comprises the deflection in the direction opposite to the front wheel and the deflection in the direction same as the front wheel. Determining the deflection direction of the rear wheels to be the reverse deflection of the front wheels in response to judging that the vehicle is in an understeer state according to the slip rate of the wheels of the vehicle; and in response to the judgment that the vehicle is in an oversteer state according to the slip rate of the vehicle wheels, determining the deflection direction of the rear wheels to be the same as that of the front wheels, and obtaining a more accurate judgment result.
And step 306, acquiring a front wheel deflection angle.
In specific implementation, front wheel steering angle information is obtained through a vehicle steering wheel, and the front wheel steering angle information comprises a vehicle front wheel deflection angle for subsequent calculation of a rear wheel deflection angle.
And 307, calculating a rear wheel deflection angle based on the front wheel deflection angle.
In specific implementation, a rear wheel steering angle relation function is calculated based on a vehicle two-degree-of-freedom model algorithm. And obtaining the deflection angle of the rear wheel of the vehicle according to the relationship function of the deflection angle of the front wheel of the vehicle and the steering angle of the rear wheel. According to the scheme, the rear wheel steering angle relation function is calculated according to the vehicle two-degree-of-freedom model algorithm, the vehicle rear wheel deflection angle is calculated based on the obtained front wheel deflection angle and the calculated rear wheel steering angle relation function, the calculation result is more accurate, and the driving safety is improved.
And 308, controlling the rear wheel of the vehicle according to the deflection direction of the rear wheel and the deflection angle of the rear wheel.
When the method is specifically implemented, the deflection direction of the rear wheel and the deflection angle of the rear wheel are sent to a controller, and the controller controls the rear wheel of the vehicle based on control information, wherein the control information comprises the deflection direction of the rear wheel and the deflection angle of the rear wheel, so that the driving smoothness is improved, and the safety risk in driving is reduced.
Based on the same inventive concept, corresponding to the method of any embodiment, the disclosure also provides a vehicle control system based on the rear wheels.
Referring to fig. 4, fig. 4 is a rear wheel-based vehicle control system of an embodiment, including:
the information acquisition module 401 is configured to acquire vehicle information, and determine a rear wheel deflection direction according to the vehicle information to obtain a rear wheel deflection direction;
an angle calculation module 402 configured to obtain front wheel steering angle information with which to determine a rear wheel yaw angle based on a vehicle centroid slip angle;
a rear wheel control module 403 configured to control a rear wheel of the vehicle based on the rear wheel yaw direction and the rear wheel yaw angle.
In some embodiments, the information obtaining module 401 specifically includes:
a parameter calculation unit configured to acquire vehicle information; calculating the slip rate or the slip rate of the vehicle wheels according to the vehicle information;
a direction determination unit configured to determine that the vehicle is in an understeer state and a rear wheel deflection direction is a reverse deflection to the front wheels in response to at least one of the vehicle front wheel slip ratio satisfying a first threshold range or the slip ratio satisfying a second threshold range and the vehicle rear wheel slip ratio satisfying a third threshold range or the slip ratio satisfying a fourth threshold range; or when at least one vehicle rear wheel slip ratio meets a first threshold range or the slip ratio meets a second threshold range and the vehicle front wheel slip ratio meets a third threshold range or the slip ratio meets a fourth threshold range, determining that the vehicle is in an oversteer state and the rear wheel deflection direction is the same as the front wheel deflection.
In some embodiments, the parameter calculating unit specifically includes:
a state acquisition subunit configured to determine a vehicle state from the vehicle information;
a calculation subunit configured to determine a slip rate of a vehicle wheel from the vehicle information in response to determining that the vehicle state is a driving state; alternatively, in response to determining that the vehicle state is a braking state, a slip rate of a wheel of the vehicle is determined from the vehicle information.
In some embodiments, the state acquisition subunit is specifically configured to acquire vehicle acceleration information and gear information; in response to the fact that the gear information is a forward gear and the acceleration information is a positive value, determining that the vehicle state is a forward driving state; in response to the gear information being a forward gear and the acceleration information being a negative value, determining that the vehicle state is a forward braking state; in response to the fact that the gear information is a reverse gear and the acceleration information is a positive value, determining that the vehicle state is a reverse braking state; and determining that the vehicle state is a reverse driving state in response to the fact that the gear information is a reverse gear and the acceleration information is a negative value.
In some embodiments, the calculation process of the rear wheel steering angle relation function in the angle calculation module 402 specifically includes:
the information acquisition unit is configured to acquire vehicle operation information and obtain a vehicle mass center slip angle function according to the vehicle operation information and a vehicle two-degree-of-freedom model algorithm, wherein the vehicle mass center slip angle function comprises a plurality of parameter information;
a function calculation unit configured to determine that the plurality of parameter information satisfy a preset condition, and determine a rear wheel steering angle relation function according to the vehicle centroid slip angle function.
In some embodiments, the information acquiring unit specifically includes:
based on the vehicle two-degree-of-freedom model algorithm, a vehicle mass center slip angle function is obtained and expressed as:
wherein m is the mass of the whole vehicle, a is the distance from the center of mass to the front axle, b is the distance from the center of mass to the rear axle, and k 1 Yaw stiffness, k, of the front axle 2 Yaw stiffness of the rear axle, δ 1 For the angle of deflection, delta, of the front wheel 2 Is the rear wheel deflection angle, u is the longitudinal vehicle speed, v is the lateral vehicle speed,
is the vehicle acceleration, beta is the vehicle centroid slip angle, omega r Is the vehicle yaw rate.
In some embodiments, the function calculating unit specifically includes:
based on the vehicle centroid side slip angle function, the plurality of parameter information meeting preset conditions comprises: in response to the centroid slip angle being zero and the acceleration being zero; determining a rear wheel steering relationship function expressed as:
for convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, the functionality of the various modules may be implemented in the same one or more pieces of software and/or hardware in practicing the present disclosure.
The device of the above embodiment is used for implementing a corresponding rear wheel-based vehicle control method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
Based on the same inventive concept, corresponding to the method of any embodiment, the disclosure further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the program, the method for controlling a vehicle based on a rear wheel according to any embodiment is implemented.
Fig. 5 is a schematic diagram illustrating a more specific hardware structure of an electronic device according to this embodiment, where the electronic device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein the processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 are communicatively coupled to each other within the device via a bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, or the like. The memory 1020 may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory 1020 and called to be executed by the processor 1010.
The input/output interface 1030 is used for connecting an input/output module to input and output information. The i/o module may be configured as a component within the device (not shown) or may be external to the device to provide corresponding functionality. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.
The communication interface 1040 is used for connecting a communication module (not shown in the drawings) to implement communication interaction between the present apparatus and other apparatuses. The communication module can realize communication in a wired mode (such as USB, network cable and the like) and also can realize communication in a wireless mode (such as mobile network, WIFI, bluetooth and the like).
The bus 1050 includes a path to transfer information between various components of the device, such as the processor 1010, memory 1020, input/output interface 1030, and communication interface 1040.
It should be noted that although the above-mentioned device only shows the processor 1010, the memory 1020, the input/output interface 1030, the communication interface 1040 and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only those components necessary to implement the embodiments of the present description, and not necessarily all of the components shown in the figures.
The electronic device of the foregoing embodiment is used to implement a corresponding rear-wheel-based vehicle control method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described again here.
Based on the same inventive concept, corresponding to any of the above-described embodiment methods, the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the rear-wheel-based vehicle control method according to any of the above-described embodiments.
Computer-readable media of the present embodiments, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the method for controlling a vehicle based on a rear wheel according to any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which are not described in detail herein.
Based on the same inventive concept, corresponding to the method of any of the above embodiments, the present application further provides a vehicle including the rear-wheel-based vehicle control system, or the electronic device, or the storage medium of the above embodiments, where the vehicle device implements the rear-wheel-based vehicle control method of any of the above embodiments.
The vehicle of the foregoing embodiment is used for implementing the vehicle control method based on the rear wheel according to any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described again here.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring embodiments of the present disclosure, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present disclosure are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that the embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures, such as Dynamic RAM (DRAM), may use the discussed embodiments.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made without departing from the spirit or scope of the embodiments of the present disclosure are intended to be included within the scope of the disclosure.
Claims (12)
1. A rear wheel-based vehicle control method, comprising:
acquiring vehicle information, and judging the deflection direction of a rear wheel according to the vehicle information to obtain the deflection direction of the rear wheel;
obtaining front wheel steering angle information, and determining a rear wheel deflection angle based on a vehicle mass center side deflection angle by using the front wheel steering angle information;
and controlling the rear wheels of the vehicle based on the rear wheel deflection direction and the rear wheel deflection angle.
2. The method of claim 1, wherein obtaining front wheel steering angle information, using which to determine a rear wheel steering angle based on a vehicle centroid slip angle, comprises:
acquiring front wheel steering angle information, and processing the front wheel steering angle information based on a rear wheel steering angle relation function determined by a vehicle mass center side slip angle to obtain a rear wheel steering angle; and the rear wheel steering angle relation function is obtained according to a vehicle two-degree-of-freedom model algorithm.
3. The method of claim 2, wherein processing the front wheel steering angle information based on a rear wheel steering angle relationship function determined from a vehicle center of mass slip angle to obtain a rear wheel steering angle further comprises:
obtaining a vehicle mass center slip angle function according to a vehicle two-degree-of-freedom model algorithm, wherein the vehicle mass center slip angle function comprises a plurality of parameter information, and the mass center slip angle is one of the plurality of parameter information;
and determining that the plurality of parameter information meet preset conditions, and determining a rear wheel steering angle relation function according to the vehicle mass center side slip angle function.
4. The method of claim 3, wherein the deriving a vehicle centroid slip angle function according to a vehicle two degree of freedom model algorithm comprises:
based on the vehicle two-degree-of-freedom model algorithm, a vehicle mass center slip angle function is obtained and expressed as:
wherein m is the mass of the whole vehicle, a is the distance from the center of mass to the front axle, b is the distance from the center of mass to the rear axle, and k 1 Yaw stiffness, k, of the front axle 2 Is the cornering stiffness of the rear axle, delta 1 For the angle of deflection, delta, of the front wheel 2 Is the rear wheel deflection angle, u is the longitudinal vehicle speed, v is the lateral vehicle speed,
is the vehicle acceleration, beta is the vehicle mass center slip angle, omega r Is the vehicle yaw rate.
5. The method of claim 4, wherein the plurality of parameter information satisfies a preset condition, and determining a rear wheel steering angle relationship function based on the vehicle centroid cornering angle function comprises:
the plurality of parameter information satisfying the preset condition includes: the centroid slip angle is zero and the acceleration is zero; determining a rear wheel steering angle relationship function based on the vehicle centroid slip angle function, expressed as:
6. the method according to claim 1, wherein the obtaining vehicle information and determining the rear wheel deflection direction according to the vehicle information to obtain the rear wheel deflection direction comprises:
acquiring vehicle information;
determining the slip rate or the slip rotation rate of the vehicle wheels according to the vehicle information;
in response to at least one vehicle front wheel slip ratio meeting a first threshold range or a slip ratio meeting a second threshold range, and a vehicle rear wheel slip ratio meeting a third threshold range or a slip ratio meeting a fourth threshold range, determining that the vehicle is in an understeer state and the rear wheel deflection direction is in reverse deflection with the front wheels; alternatively, the first and second electrodes may be,
and in response to the fact that at least one vehicle rear wheel slip ratio meets a first threshold range or the slip ratio meets a second threshold range, and when the vehicle front wheel slip ratio meets a third threshold range or the slip ratio meets a fourth threshold range, determining that the vehicle is in an oversteer state, and the deflection direction of the rear wheels is in the same direction as that of the front wheels.
7. The method of claim 6, the determining a slip rate or a slip rate of a vehicle wheel from the vehicle information, comprising:
judging the vehicle state according to the vehicle information;
in response to determining that the vehicle state is a driving state, determining a slip rate of a vehicle wheel according to the vehicle information; alternatively, the first and second liquid crystal display panels may be,
in response to determining that the vehicle state is a braking state, determining a slip rate of a vehicle wheel from the vehicle information.
8. The method of claim 7, wherein said determining a vehicle state from said vehicle information comprises:
acquiring vehicle acceleration information and gear information;
in response to the fact that the gear information is a forward gear and the acceleration information is a positive value, determining that the vehicle state is a forward driving state;
in response to the fact that the gear information is a forward gear and the acceleration information is a negative value, determining that the vehicle state is a forward braking state;
in response to the fact that the gear information is a reverse gear and the acceleration information is a positive value, determining that the vehicle state is a reverse braking state;
and determining that the vehicle state is a reverse driving state in response to the fact that the gear information is a reverse gear and the acceleration information is a negative value.
9. A rear wheel based vehicle control system, comprising:
the information acquisition module is configured to acquire vehicle information and judge the deflection direction of the rear wheel according to the vehicle information to obtain the deflection direction of the rear wheel;
an angle calculation module configured to obtain front wheel steering angle information with which a rear wheel yaw angle is determined based on a vehicle centroid slip angle;
a rear wheel control module configured to control a rear wheel of a vehicle based on the rear wheel yaw direction and the rear wheel yaw angle.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor when executing the program implementing a rear wheel based vehicle control method as claimed in any one of claims 1 to 8.
11. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the rear-wheel-based vehicle control method according to any one of claims 1 to 8.
12. A vehicle comprising the rear-wheel-based vehicle control system of claim 9 or the electronic device of claim 10 or the computer-readable storage medium of claim 11.
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| CN202211436479.4A CN115675445A (en) | 2022-11-16 | 2022-11-16 | Vehicle control method, system, equipment, storage medium and vehicle based on rear wheels |
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| CN202211436479.4A CN115675445A (en) | 2022-11-16 | 2022-11-16 | Vehicle control method, system, equipment, storage medium and vehicle based on rear wheels |
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