阅读说明：本技术 一种纯电动汽车驱动控制方法 (Pure electric vehicle drive control method ) 是由 周稼铭 何洪文 刘艳芳 王书翰 董鹏 徐向阳 衣丰艳 胡东海 衣杰 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种纯电动汽车驱动控制方法,包括如下步骤：S1,判断是否收到制动信号,是,执行步骤S2；否,执行步骤S3；S2,将蓄电池与驱动电机断开连接,将超级电容与驱动电机连接；驱动电机发电并充入到超级电容中；S3,采集超级电容端电压和蓄电池SOC；S4,初步判断是否进行双驱动控制；是,执行步骤S5；否,执行步骤S6；S5,控制蓄电池和超级电容同时给驱动电机供电；S6,获取车辆行驶速度和加速度；S7,根据车辆行驶速度和加速度,判断是否进行双驱动控制:是,进入步骤S8,否,进入步骤S9；S8,控制蓄电池和超级电容同时给驱动电机供电；S9,控制蓄电池给驱动电机供电。解决了汽车续航里程较低,严重限制了纯电动汽车使用的问题。(The invention discloses a pure electric vehicle drive control method, which comprises the following steps: s1, judging whether a braking signal is received, if yes, executing step S2; otherwise, go to step S3; s2, disconnecting the storage battery from the driving motor, and connecting the super capacitor with the driving motor; the driving motor generates power and charges the power into the super capacitor; s3, acquiring the terminal voltage of the super capacitor and the SOC of the storage battery; s4, preliminarily judging whether to perform dual-drive control; if yes, go to step S5; otherwise, go to step S6; s5, controlling the storage battery and the super capacitor to simultaneously supply power to the driving motor; s6, acquiring the running speed and the acceleration of the vehicle; s7, judging whether to carry out double-drive control according to the running speed and the acceleration of the vehicle, if so, going to step S8, and if not, going to step S9; s8, controlling the storage battery and the super capacitor to simultaneously supply power to the driving motor; and S9, controlling the storage battery to supply power to the driving motor. The problem of car continuation of the journey mileage lower, seriously restrict pure electric vehicles to use is solved.)

1. A pure electric vehicle drive control method is applied to a pure electric vehicle powered by a storage battery and a super capacitor, and is characterized in that: the control method comprises the following steps:

s1, judging whether a braking signal is received, if yes, executing step S2; otherwise, go to step S3;

s2, disconnecting the storage battery from the driving motor, and connecting the super capacitor with the driving motor; the driving motor generates power and charges the power into the super capacitor;

s3, acquiring the terminal voltage of the super capacitor and the SOC of the storage battery;

s4, preliminarily judging whether to perform dual-drive control; if yes, go to step S5; otherwise, go to step S6;

s5, controlling the storage battery and the super capacitor to simultaneously supply power to the driving motor;

s6, acquiring the running speed and the acceleration of the vehicle;

s7, judging whether to carry out double-drive control according to the running speed and the acceleration of the vehicle, if so, going to step S8, and if not, going to step S9;

s8, controlling the storage battery and the super capacitor to simultaneously supply power to the driving motor;

and S9, controlling the storage battery to supply power to the driving motor.

2. The pure electric vehicle drive control method according to claim 1, characterized in that: step S4 specifically includes:

s401, judging whether the voltage of the super capacitor end is larger than 45V, if so, executing step S5; if not, executing step S402;

s402, judging whether the SOC of the storage battery is less than 0.2, if so, executing a step S5; if not, step S6 is performed.

3. The pure electric vehicle drive control method according to claim 2, characterized in that: before step S1, the method further includes:

s01, acquiring road condition information, and constructing a comprehensive working condition according with the driving condition characteristics of the pure electric vehicle according to the road condition information;

s02, calculating a vehicle driving state transition probability matrix;

step S5 and step S8 each include the steps of:

a, solving an optimal power distribution ratio based on Markov decision-making calculation according to the driving state transition probability matrix;

and B, controlling a storage battery and a super capacitor to supply power to the driving motor according to the optimal power distribution ratio.

4. The pure electric vehicle drive control method according to claim 3, wherein step B specifically comprises,

b1, acquiring the state parameters of the current vehicle, and calculating the power required by the vehicle according to the state parameters of the current vehicle;

b2, determining the required storage battery output power and the required super capacitor output power according to the required power and the optimal power distribution ratio;

b3, controlling the storage battery and the super capacitor to supply power according to the required storage battery output power and the required super capacitor output power respectively.

5. The pure electric vehicle drive control method according to claim 3, characterized in that: step S01 specifically includes:

s011, collecting actual road running condition data of the pure electric vehicle, and extracting a kinematic segment;

and S012, extracting and classifying the characteristic values of the kinematic segments based on a principal component analysis and cluster analysis method, extracting a representative driving condition by using a correlation coefficient, and constructing a comprehensive working condition according with the characteristics of the driving condition of the pure electric vehicle.

6. The pure electric vehicle drive control method according to claim 1, wherein in step S01, the step of obtaining the road condition information is to use a GPS vehicle-mounted data acquisition device to acquire and process basic road data of a driving experiment, and obtain characteristic information of driving conditions such as a track, a displacement, and a speed of the vehicle.

7. The pure electric vehicle drive control method according to claim 1, characterized in that: when the terminal voltage of the super capacitor is collected, if the boundary voltage lower than 35V is collected at a certain moment, the super capacitor enters a low-voltage working state, and meanwhile, the collection of voltage signals is suspended until a braking signal is obtained.

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a driving control method of an electric automobile.

Background

In order to deal with the problems of energy shortage and environmental pollution, the development of new energy automobiles is more and more concerned by governments and society of various countries, and the types of electric automobiles are as follows: the electric automobile is a vehicle which takes a vehicle-mounted power supply as power and is driven by a motor to run, meets various requirements of road traffic and safety regulations.

The main part of the power automobile is the battery, the pure electric automobile in the existing market does not have the function of intelligent distribution and use of battery electric energy, so that unnecessary energy consumption of the automobile is large when the automobile is used, the endurance mileage of the automobile is low, the use of the pure electric automobile is severely limited, how to reasonably adjust the energy distribution of the electric automobile under the condition of a complex road, the energy consumption of the whole automobile is reduced, the endurance mileage of the pure electric automobile is prolonged, and the power automobile is a main problem concerned by the industry and students

Disclosure of Invention

The invention aims to provide a driving control method of an electric automobile, which has the advantage of intelligently distributing battery electric energy and solves the problem that the electric automobile in the existing market does not have the function of intelligently distributing the battery electric energy.

In order to achieve the purpose, the invention provides the following technical scheme: a pure electric vehicle drive control method is applied to a pure electric vehicle powered by a storage battery and a super capacitor, and comprises the following steps:

s1, judging whether a braking signal is received, if yes, executing step S2; otherwise, go to step S3;

s2, disconnecting the storage battery from the driving motor, and connecting the super capacitor with the driving motor; the driving motor generates power and charges the power into the super capacitor;

s3, acquiring the terminal voltage of the super capacitor and the SOC of the storage battery;

s4, preliminarily judging whether to perform dual-drive control; if yes, go to step S5; otherwise, go to step S6;

s5, controlling the storage battery and the super capacitor to simultaneously supply power to the driving motor;

s6, acquiring the running speed and the acceleration of the vehicle;

s7, judging whether to carry out double-drive control according to the running speed and the acceleration of the vehicle, if so, going to step S8, and if not, going to step S9;

s8, controlling the storage battery and the super capacitor to simultaneously supply power to the driving motor;

and S9, controlling the storage battery to supply power to the driving motor.

The pure electric vehicle drive control method as described above, wherein optionally, step S4 specifically includes:

s401, judging whether the voltage of the super capacitor end is larger than 45V, if so, executing step S5; if not, executing step S402;

s402, judging whether the SOC of the storage battery is less than 0.2, if so, executing a step S5; if not, step S6 is performed.

The pure electric vehicle drive control method as described above, optionally before step S1, further includes:

s01, acquiring road condition information, and constructing a comprehensive working condition according with the driving condition characteristics of the pure electric vehicle according to the road condition information;

s02, calculating a vehicle driving state transition probability matrix;

step S5 and step S8 each include the steps of:

a, solving an optimal power distribution ratio based on Markov decision-making calculation according to the driving state transition probability matrix;

and B, controlling a storage battery and a super capacitor to supply power to the driving motor according to the optimal power distribution ratio.

The pure electric vehicle drive control method as described above, wherein, optionally, step B specifically includes,

b1, acquiring the state parameters of the current vehicle, and calculating the power required by the vehicle according to the state parameters of the current vehicle;

b2, determining the required storage battery output power and the required super capacitor output power according to the required power and the optimal power distribution ratio;

b3, controlling the storage battery and the super capacitor to supply power according to the required storage battery output power and the required super capacitor output power respectively.

The pure electric vehicle drive control method as described above, wherein optionally, step S01 specifically includes:

s011, collecting actual road running condition data of the pure electric vehicle, and extracting a kinematic segment;

and S012, extracting and classifying the characteristic values of the kinematic segments based on a principal component analysis and cluster analysis method, extracting a representative driving condition by using a correlation coefficient, and constructing a comprehensive working condition according with the characteristics of the driving condition of the pure electric vehicle.

Optionally, in the step S01, the acquiring the road condition information includes acquiring and processing basic road data of a driving experiment by using a GPS vehicle-mounted data acquisition device, and acquiring characteristic information of driving conditions such as a track, a displacement, and a speed of the vehicle.

The pure electric vehicle drive control method may optionally enter a low-voltage working state when the super capacitor terminal voltage is collected and a demarcation voltage lower than 35V is collected at a certain time, and meanwhile, the collection of the voltage signal is suspended until the braking signal is obtained.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the running condition of the pure electric vehicle is constructed and predicted through the actual road running condition data, the use of the battery electric quantity of the pure electric vehicle is optimally managed through an intelligent data acquisition and driving method, the economy and the service life of the pure electric vehicle are improved, and the problems that the pure electric vehicle in the existing market does not have the function of intelligent distribution and use of the battery electric energy, the unnecessary energy consumption of the vehicle is larger during use, the cruising range of the vehicle is lower, and the use of the pure electric vehicle is seriously limited are solved.

Drawings

FIG. 1 is a flowchart showing the steps of example 1 of the present invention.

Fig. 2 is a flowchart illustrating a detailed step of step S4 in embodiment 1 of the present invention;

FIG. 3 is a flowchart illustrating steps S5 and S8 according to embodiment 1 of the present invention;

FIG. 4 is a flowchart illustrating the detailed steps of step B in embodiment 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.