CN116022144B - New energy automobile constant-speed cruising and decelerating control method and control system - Google Patents
New energy automobile constant-speed cruising and decelerating control method and control system Download PDFInfo
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Abstract
The invention provides a control method and a control system for constant-speed cruising and decelerating of a new energy automobile, wherein the control method comprises the following steps: acquiring an opening request of constant-speed cruising, and activating a vehicle constant-speed cruising mode according to the opening request; in the constant-speed cruising mode, when the target vehicle speed set by a user is identified to be lower than the current vehicle speed, activating a deceleration control function, and calculating target deceleration torque required by the vehicle to decelerate from the current vehicle speed to the target vehicle speed; according to the working condition of the vehicle, adopting a corresponding deceleration control mode to perform deceleration control on the vehicle; and when the current speed of the vehicle is reduced to the target speed, exiting the corresponding deceleration control mode. The invention can meet the constant-speed cruising and decelerating requirements of the vehicle under different working conditions, improves the constant-speed cruising and decelerating performance of the vehicle, improves the applicability and the safety of the constant-speed cruising, reduces the frequent exit risk of the constant-speed cruising caused by larger fluctuation of the vehicle speed, increases the application scene of the constant-speed cruising, and further brings better constant-speed cruising experience to users.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a constant-speed cruising and decelerating control method and a control system for a new energy automobile.
Background
The constant speed cruising SYSTEM (CCS) is a SYSTEM for keeping the automatic constant speed running of the automobile by using the electronic CONTROL technology, which is also called as a speed CONTROL SYSTEM, an automatic driving SYSTEM and the like, and has the main functions of locking the speed per hour of the automobile according to the requirement of the user, the automobile can automatically keep a fixed speed per hour running without stepping on a pedal by the user in the running process, and when the automobile runs on a highway, the fatigue of the user can be effectively reduced, meanwhile, the unnecessary speed change is reduced, and the consumption of energy is saved.
Along with the increasing popularization of new energy automobiles, the auxiliary driving configuration of the constant-speed cruising system is also standardized more and more, and compared with the traditional constant-speed cruising control method of the fuel oil automobile, the new energy automobile motor has an energy recovery function and can realize better constant-speed cruising and decelerating control. At present, the new energy automobile constant speed cruises and decelerates generally adopts the energy recovery torque of sliding to control the vehicle deceleration process, and because the working condition of the vehicle is complex, under different working conditions, the energy recovery torque of sliding is adopted to control the vehicle to decelerate, and the following problems exist:
1) When a user actively sets deceleration, the magnitude of the deceleration of the torque of the recovery of the sliding energy is more limited, the deceleration is generally smaller and is only within 0.1-0.15g, the deceleration effect is limited, the deceleration requirement of the user can not be rapidly met, and the user experience is influenced;
2) When a non-user actively sets a deceleration requirement, when the vehicle encounters a long downhill working condition, the vehicle is decelerated by recovering deceleration torque by the sliding energy, the vehicle deceleration requirement cannot be met, the vehicle is still continuously accelerated under the action of gravity, a constant-speed cruising mode is easy to exit, and stable constant-speed cruising cannot be realized;
3) The vehicle energy recovery capability is influenced by relevant factors such as battery electric quantity, battery temperature, motor recovery power and the like, and the possible sliding energy recovery deceleration can be smaller than 0.1-0.15g, so that more working condition coverage cannot be realized, and if the vehicle energy recovery capability condition cannot be met at this time, the deceleration target of constant-speed cruising cannot be realized, constant-speed cruising is caused, and the user experience is influenced.
Through the analysis, the existing new energy automobile controls the vehicle to decelerate through the sliding energy recovery torque, and the constant-speed cruising and decelerating requirements of the vehicle under different working conditions cannot be effectively covered.
In view of this, overcoming the drawbacks of the prior art is a problem to be solved in the art.
Disclosure of Invention
The invention provides a solution to the technical problem that the existing new energy automobile can not effectively cover the deceleration requirements of the automobile under different working conditions by controlling the deceleration of the automobile through the sliding energy recovery torque.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for controlling constant-speed cruising and decelerating of a new energy automobile, which comprises the following steps:
s10, acquiring an opening request of constant-speed cruising, and activating a vehicle constant-speed cruising mode according to the opening request;
s20, in a constant-speed cruising mode, when the fact that the target vehicle speed set by a user is lower than the current vehicle speed is identified, activating a deceleration control function, and calculating target deceleration torque required by the vehicle to decelerate from the current vehicle speed to the target vehicle speed;
s30, adopting a corresponding deceleration control mode to perform deceleration control on the vehicle according to the working condition of the vehicle;
and S40, when the current speed of the vehicle is reduced to the target speed, exiting the corresponding deceleration control mode.
Preferably, in S20, the calculating a target deceleration torque required for decelerating the vehicle from the current vehicle speed to the target vehicle speed includes:
s21, calculating a difference value between the target vehicle speed and the current vehicle speed;
s22, calculating a target deceleration according to a difference value between the target vehicle speed and the current vehicle speed;
s23, calculating target deceleration torque according to the target deceleration.
Preferably, when the target deceleration torque does not exceed the coasting energy recovery torque, in S30, the deceleration control method is adopted to perform deceleration control on the vehicle according to the working condition of the vehicle, including:
s31, decelerating the vehicle by adopting the coasting energy recovery torque.
Preferably, when the target deceleration torque does not exceed the sum of the coasting energy recovery torque and the braking energy recovery torque, in S30, the deceleration control method is adopted to perform deceleration control on the vehicle according to the working condition of the vehicle, including:
s32, decelerating the vehicle by adopting the electric braking torque.
Preferably, in S32, the step of decelerating the vehicle by using electric braking torque specifically includes:
s321, calculating a difference value between the target deceleration torque and the coasting energy recovery torque;
s322, the difference between the target deceleration torque and the coasting energy recovery torque is sent to a brake controller as a required electric brake torque request, and electric brake is overlapped on the vehicle through the brake controller.
Preferably, when the target deceleration torque exceeds the sum of the coasting energy recovery torque and the braking energy recovery torque, in S30, the deceleration control is performed on the vehicle by adopting a corresponding deceleration control mode according to the working condition of the vehicle, including:
s33, decelerating the vehicle by adopting hydraulic braking.
Preferably, in S33, the step of decelerating the vehicle by hydraulic braking specifically includes:
s331, calculating a difference value of the sum of the target deceleration torque, the maximum coasting energy recovery torque and the maximum braking energy recovery torque;
and S332, sending the difference value of the sum of the target deceleration torque, the maximum coasting energy recovery torque and the maximum braking energy recovery torque to a brake controller as a required hydraulic braking torque request, and superposing hydraulic braking on the vehicle through the brake controller.
Preferably, for the hybrid vehicle, when the target deceleration torque does not exceed the sum of the coasting energy recovery torque, the braking energy recovery torque and the engine reverse towing torque, in S30, the deceleration control is performed on the vehicle by adopting a corresponding deceleration control mode according to the working condition of the vehicle, including:
s34, the engine reverse towing torque is increased to reduce the speed of the vehicle.
Preferably, if the user sets the vehicle navigation information, when it is identified that there is a long downhill in front of the vehicle, in S30, the deceleration control is performed on the vehicle by adopting a corresponding deceleration control manner according to the working condition of the vehicle, including:
and S35, reminding the user to reduce the target vehicle speed, actively activating a deceleration control function, and performing deceleration control on the vehicle in a mode of S31, S32, S33 or S34 according to the gradient, the gradient length and the speed information of the vehicle.
In a second aspect, the present invention provides a constant-speed cruising and decelerating control system for a new energy automobile, including:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor, for controlling the new energy automobile constant speed cruising and decelerating control method according to the first aspect.
Aiming at the defects in the prior art, the invention has the following beneficial effects:
the invention can meet the constant-speed cruising and decelerating requirements of the vehicle under different working conditions, improves the constant-speed cruising and decelerating performance of the vehicle, improves the applicability and the safety of the constant-speed cruising, can continuously and stably ensure the realization of the constant-speed cruising and decelerating function when the recovery capacity of a power system is sufficient or insufficient, reduces the frequent exit risk of the constant-speed cruising caused by the large fluctuation of the vehicle speed, increases the application scene of the constant-speed cruising, expands the application range of the constant-speed cruising, and further brings better constant-speed cruising experience to users.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments of the present invention will be briefly described below. It is evident that the drawings described below are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of a constant-speed cruising and decelerating control flow of a new energy automobile provided in embodiment 1;
fig. 2 is a schematic diagram of a constant-speed cruising and decelerating control process of the pure electric vehicle provided in embodiment 1;
fig. 3 is a schematic diagram of a process of constant-speed-cruise control of the hybrid electric vehicle according to embodiment 1;
fig. 4 is a schematic diagram of a constant-speed cruising and decelerating control system of a new energy automobile provided in embodiment 2.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In addition, the technical features of each embodiment or the single embodiment provided by the invention can be combined with each other at will to form a feasible technical scheme, and the combination is not limited by the sequence of steps and/or the structural composition mode, but is necessarily based on the fact that a person of ordinary skill in the art can realize the combination, and when the technical scheme is contradictory or can not realize, the combination of the technical scheme is not considered to exist and is not within the protection scope of the invention claimed.
Example 1:
the driving process of the vehicle is roughly divided into the following three processes: when the vehicle is started or accelerated, the vehicle starts accelerating after a certain acceleration is obtained; after the cruise control function is started, the vehicle enters a cruise control mode; when the vehicle needs to be decelerated or parked, the vehicle starts to decelerate after a certain deceleration is obtained.
In order to solve the technical problem that the existing new energy automobile controls the vehicle to decelerate through the sliding energy recovery torque and cannot effectively cover the deceleration requirement of the vehicle under different working conditions, the embodiment 1 provides a new energy automobile constant-speed cruising deceleration control method, as shown in fig. 1, comprising the following steps:
s10, acquiring an opening request of the constant-speed cruising, and activating a vehicle constant-speed cruising mode according to the opening request.
In this step, the start request of the cruise control is preferably obtained through a man-machine exchange mode, and when the vehicle receives a start request instruction of the cruise control issued by the user, the vehicle enters a cruise control mode.
S20, in the constant-speed cruising mode, when the fact that the target vehicle speed set by a user is lower than the current vehicle speed is identified, activating a deceleration control function, and calculating target deceleration torque required by the vehicle to decelerate from the current vehicle speed to the target vehicle speed.
Due to traffic conditions or driving lines of sight, the user may need to reduce the current vehicle speed in the constant speed cruise mode, namely: the current speed of the vehicle in the constant speed cruising mode is adjusted to a lower target speed, for example, in the constant speed cruising mode, the current speed of the vehicle is 120km/h, and the speed limit of the next road segment is 100km/h, so that the user can actively adjust the current speed of the vehicle to the target speed of 100km/h.
The torque is a special moment for rotating wheels of a vehicle, is inversely related to the rotating speed of a motor under the condition of fixed power, and is the physical quantity reflecting acceleration and deceleration and load capacity of the vehicle in a certain range, and is equal to the product of force and force arm, wherein the faster the rotating speed is, the smaller the torque is, and the larger the torque is.
In the constant-speed cruising mode, if the power controller of the vehicle recognizes that a user actively sets a lower target vehicle speed, the vehicle automatically activates a deceleration control function and calculates a target deceleration torque required for decelerating the vehicle from the current vehicle speed to the target vehicle speed.
In calculating the target deceleration torque, in S20, the calculating the target deceleration torque required for decelerating the vehicle from the current vehicle speed to the target vehicle speed includes:
s21, calculating a difference value between the target vehicle speed and the current vehicle speed.
Let the current vehicle speed be V0 and the target difference be Vt, then:
V＝V 0 -V t
wherein V is the difference between the target vehicle speed and the current vehicle speed.
S22, calculating target deceleration according to the difference value between the target vehicle speed and the current vehicle speed.
According to the acceleration calculation formula, there are:
V t ＝V 0 +at
wherein a is the target deceleration (a < 0), and t is time.
Due to V 0 -V t As such, the target deceleration a can be calculated, as is known.
S23, calculating target deceleration torque according to the target deceleration.
The target deceleration torque may be further calculated in combination with the motor power and torque formula.
S30, adopting a corresponding deceleration control mode to perform deceleration control on the vehicle according to the working condition of the vehicle.
The working condition of the vehicle refers to the working condition of the vehicle in the running process, and generally has certain complexity. The motion modes according to the vehicle mainly comprise: running conditions such as starting, accelerating, constant speed, decelerating, turning, ascending and descending slopes, stopping and the like; the control mode according to the user mainly comprises the following steps: the driving conditions of gear shifting, sliding, accelerator speed control, steering, reversing and the like; the load conditions mainly include: no-load, full-load, overload and other operating conditions.
In this step, the working condition of the vehicle, especially, the working condition that the vehicle needs to perform deceleration control when the vehicle is cruising at a constant speed, where the manner of performing deceleration control on the vehicle is mainly determined according to the magnitude of the target deceleration torque calculated in S20.
As one of the working conditions, when the target deceleration torque does not exceed the coasting energy recovery torque, in S30, the deceleration control method is adopted to perform deceleration control on the vehicle according to the working condition of the vehicle, including: s31, decelerating the vehicle by adopting the sliding energy recovery torque; under this operating mode, the required deceleration is less, and when battery available recharging power is enough, the power controller is according to battery recycling power and the available recovery torque capacity of motor contrast and is got less value, and at this moment, adopts the energy recovery moment of torsion that slides to slow down the vehicle, can improve the duration, reduces the energy consumption, and this scheme that also is commonly used at present.
As one of the working conditions, when the target deceleration torque does not exceed the sum of the coasting energy recovery torque and the braking energy recovery torque, in S30, the deceleration control is performed on the vehicle by adopting a corresponding deceleration control mode according to the working condition of the vehicle, including: s32, decelerating the vehicle by adopting electric braking torque; the electric brake torque includes: coasting energy recovery torque and braking energy recovery torque; under the working condition, the required deceleration is larger, when the available recharging power of the battery is enough, the power controller takes a smaller value according to the battery recycling power and the available recycling torque capacity of the motor, but the actual application requirement cannot be met by only adopting the sliding energy recycling torque to decelerate the vehicle, and the deceleration control of the vehicle cannot be realized quickly and efficiently, and at the moment, in order to obtain larger deceleration torque, the electric braking torque is adopted to decelerate the vehicle.
In a specific implementation, in S32, the step of decelerating the vehicle by using the electric brake torque specifically includes:
s321, calculating the difference between the target deceleration torque and the coasting energy recovery torque.
S322, the difference between the target deceleration torque and the coasting energy recovery torque is sent to a brake controller as a required electric brake torque request, and electric brake is overlapped on the vehicle through the brake controller.
Through the steps S321-S322, when the vehicle is decelerated by adopting the coasting energy recovery torque and cannot meet the actual application requirement, the deceleration control of the vehicle is realized by superposing electric brake compensation on the vehicle.
As one of the working conditions, when the target deceleration torque exceeds the sum of the coasting energy recovery torque and the braking energy recovery torque, in S30, the deceleration control is performed on the vehicle by adopting a corresponding deceleration control mode according to the working condition of the vehicle, including: s33, decelerating the vehicle by adopting hydraulic braking; in a deceleration process, only the brake pedal is depressed, and the brake wheel cylinder generates hydraulic pressure to brake; under the working condition, the required deceleration is very large, and the available recharging power of the battery is insufficient, namely: the electric braking is adopted to slow down the vehicle, so that the actual application requirement cannot be met, the speed reduction control of the vehicle cannot be quickly and efficiently realized, and at the moment, the hydraulic braking is adopted to slow down the vehicle in order to obtain larger speed reduction torque.
In a specific implementation, in S33, the step of decelerating the vehicle by hydraulic braking specifically includes:
s331, calculating a difference value of the sum of the target deceleration torque, the maximum coasting energy recovery torque and the maximum braking energy recovery torque;
and S332, sending the difference value of the sum of the target deceleration torque, the maximum coasting energy recovery torque and the maximum braking energy recovery torque to a brake controller as a required hydraulic braking torque request, and superposing hydraulic braking on the vehicle through the brake controller.
Through the steps S331-S332, when the electric braking torque is adopted to decelerate the vehicle and the actual application requirement cannot be met, the vehicle is subjected to deceleration control by superposing hydraulic brake compensation on the vehicle.
The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like, wherein the hybrid electric automobile and a vehicle driving system are combined by two or more driving systems capable of running simultaneously and are provided with a motor and an engine.
Fig. 2 is a schematic diagram of a constant-speed cruising and decelerating control process of the pure electric vehicle provided in embodiment 1.
Fig. 3 is a schematic diagram of a process of constant-speed-cruise control of the hybrid electric vehicle according to embodiment 1.
In particular, for a hybrid vehicle, as one of the working conditions, when the target deceleration torque does not exceed the sum of the coasting energy recovery torque, the braking energy recovery torque and the engine reverse towing torque, in S30, the vehicle is deceleration controlled by adopting a corresponding deceleration control mode according to the working condition of the vehicle, including: s34, increasing the reverse towing torque of the engine to decelerate the vehicle; under the working condition, the required deceleration is large, and the available recharging power of the battery is insufficient, namely: the electric braking is adopted to reduce the speed of the vehicle, the actual application requirement cannot be met, the speed reduction control of the vehicle cannot be realized quickly and efficiently, in order to obtain larger speed reduction torque, an engine is directly connected on the basis of the electric braking, a power system is used for connecting the engine with clutches at two ends of a transmission shaft, and the vehicle is decelerated by superposing the engine reverse traction torque on the vehicle by utilizing the engine reverse traction torque attached to the hybrid electric vehicle; further, if the vehicle is decelerated by superimposing the engine reverse torque on the vehicle, the actual application requirement still cannot be met, and the rest is transmitted to the brake controller to serve as a hydraulic brake request, at this time, S33 is executed, and the vehicle is decelerated by adopting hydraulic braking.
Based on further consideration of the complexity of the vehicle working condition, the required deceleration may be particularly large for the application scenario of long downhill, as one working condition, if the user sets the vehicle navigation information, when recognizing that there is a long downhill in front of the vehicle, in S30, the vehicle is subjected to deceleration control by adopting a corresponding deceleration control mode according to the working condition of the vehicle, including: s35, reminding a user to reduce a target vehicle speed, actively activating a deceleration control function, and performing deceleration control on the vehicle in a mode of S31, S32, S33 or S34 according to the gradient, the gradient length and the speed information of the vehicle; under the working condition, a corresponding deceleration control mode is needed to be adopted in combination with specific conditions, and when the vehicle is subjected to deceleration control in the modes of S31, S32, S33 or S34, the vehicle is needed to be selected step by step so as to ensure the stability and the safety of a constant-speed cruising mode of the vehicle; if the average gradient is greater than a certain value and the downhill distance exceeds a certain value, the acceleration of the whole vehicle is particularly high under the action of gravity, the required deceleration is particularly high for realizing the deceleration control of the vehicle, and at the moment, the power system actively reminds a user of long downhill in front, actively activates the deceleration control function and actively reduces the target vehicle speed of constant-speed cruising in advance.
In addition, as one of the working conditions, if the user does not set the vehicle navigation information, the long downhill is encountered in the constant-speed cruising process of the vehicle, the current vehicle speed is possibly higher than the target vehicle speed set by the user, when the current vehicle speed is identified to be always higher than the target vehicle speed set by the user for a certain time, the deceleration control function can be actively activated to keep the stability of the current vehicle speed and the target vehicle speed, the electric braking, the engine dragging or the hydraulic braking is actively involved in deceleration, the vehicle is reasonably controlled in a deceleration mode of S31, S32, S33 or S34, continuous deceleration is realized, and the target vehicle speed and the current vehicle speed are kept within a certain safety range, so that stable constant-speed cruising is realized.
And S40, when the current speed of the vehicle is reduced to the target speed, exiting the corresponding deceleration control mode.
In this step, when the current speed of the vehicle decreases to the target speed, the deceleration control process is completed for the vehicle, and the current speed and the target speed of the vehicle may slightly fluctuate in a smaller range without causing the constant speed cruise mode to exit, taking into account the real-time dynamic error change.
When the user resets a new target vehicle speed, for example, 90km/h, or recognizes that the vehicle has encountered a long downhill slope, the system activates the corresponding deceleration control mode again, and repeats the above-described S20-S40 process.
Example 2:
based on the embodiment 1 and based on the same general technical scheme as that of the embodiment 1, as shown in fig. 4, a schematic structural diagram of a constant-speed cruising and decelerating control system of a new energy automobile provided in this embodiment 2 includes: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor to perform the method for controlling constant speed cruising and decelerating of the new energy automobile according to embodiment 1.
In summary, the invention provides the constant-speed-cruising and decelerating control method and the control system for the new energy automobile, which can meet the constant-speed-cruising and decelerating requirements of the automobile under different working conditions, improve the constant-speed-cruising and decelerating performance of the automobile, improve the applicability and the safety of the constant-speed-cruising, continuously and stably ensure the realization of the constant-speed-cruising and decelerating function when the recovery capacity of a power system is sufficient or insufficient, reduce the frequent exit risk of the constant-speed-cruising caused by the large fluctuation of the automobile speed, increase the application scene of the constant-speed-cruising, enlarge the application range of the constant-speed-cruising, and further bring better constant-speed-cruising experience to users.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, electronic device, or computer software program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, systems, electronic devices, or computer software program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a system for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
Claims (6)
1. The constant-speed cruising and decelerating control method for the new energy automobile is characterized by comprising the following steps of:
s10, acquiring an opening request of constant-speed cruising, and activating a vehicle constant-speed cruising mode according to the opening request;
s20, in a constant-speed cruising mode, when the fact that the target vehicle speed set by a user is lower than the current vehicle speed is identified, activating a deceleration control function, and calculating target deceleration torque required by the vehicle to decelerate from the current vehicle speed to the target vehicle speed;
s30, adopting a corresponding deceleration control mode to perform deceleration control on the vehicle according to the working condition of the vehicle;
the method specifically comprises the following steps:
s31, when the target deceleration torque does not exceed the coasting energy recovery torque, decelerating the vehicle by adopting the coasting energy recovery torque;
s32, when the target deceleration torque does not exceed the sum of the sliding energy recovery torque and the braking energy recovery torque, decelerating the vehicle by adopting the electric braking torque;
s33, when the target deceleration torque exceeds the sum of the sliding energy recovery torque and the braking energy recovery torque, decelerating the vehicle by adopting hydraulic braking;
s34, for the hybrid electric vehicle, when the target deceleration torque does not exceed the sum of the sliding energy recovery torque, the braking energy recovery torque and the engine reverse traction torque, the engine reverse traction torque is increased to decelerate the vehicle;
and S40, when the current speed of the vehicle is reduced to the target speed, exiting the corresponding deceleration control mode.
2. The method according to claim 1, wherein in S20, the calculating the target deceleration torque required for decelerating the vehicle from the current vehicle speed to the target vehicle speed includes:
s21, calculating a difference value between the target vehicle speed and the current vehicle speed;
s22, calculating a target deceleration according to a difference value between the target vehicle speed and the current vehicle speed;
s23, calculating target deceleration torque according to the target deceleration.
3. The method for controlling the constant-speed cruising and decelerating of the new energy automobile according to claim 2, wherein in S32, the step of decelerating the automobile by adopting the electric braking torque comprises the following steps:
s321, calculating a difference value between the target deceleration torque and the coasting energy recovery torque;
s322, the difference between the target deceleration torque and the coasting energy recovery torque is sent to a brake controller as a required electric brake torque request, and electric brake is overlapped on the vehicle through the brake controller.
4. The method for controlling constant speed cruising and decelerating of a new energy vehicle according to claim 3, wherein in S33, the step of decelerating the vehicle by hydraulic braking comprises:
s331, calculating a difference value of the sum of the target deceleration torque, the maximum coasting energy recovery torque and the maximum braking energy recovery torque;
and S332, sending the difference value of the sum of the target deceleration torque, the maximum coasting energy recovery torque and the maximum braking energy recovery torque to a brake controller as a required hydraulic braking torque request, and superposing hydraulic braking on the vehicle through the brake controller.
5. The method for controlling the constant-speed cruising and decelerating of the new energy automobile according to claim 1, wherein if the user sets the navigation information of the automobile, when recognizing that there is a long downhill in front of the automobile, in S30, the step of performing deceleration control on the automobile by adopting a corresponding deceleration control mode according to the working condition of the automobile comprises the following steps:
and S35, reminding the user to reduce the target vehicle speed, actively activating a deceleration control function, and performing deceleration control on the vehicle in a mode of S31, S32, S33 or S34 according to the gradient, the gradient length and the speed information of the vehicle.
6. The utility model provides a new energy automobile cruise control system, which is characterized in that includes:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor, for executing the new energy vehicle constant speed cruising and decelerating control method according to any one of claims 1 to 5.
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