阅读说明：本技术 一种混合动力汽车最大车速的控制方法 (Control method for maximum speed of hybrid electric vehicle ) 是由 严文文 于 2021-05-25 设计创作，主要内容包括：本发明属于混合动力汽车控制技术领域,具体为一种混合动力汽车最大车速的控制方法,包括步骤一：车辆数据接收,接收车速、驾驶员需求功率、发动机需求功率、电机需求功率,确定最大车速限定状态；步骤二：获取发动机和电机的最佳经济数据,通过实验测得发动机和电机的效率图,并制定出各自的最佳经济曲线；步骤三：计算发动机和电机在各自需求功率下的最佳经济转速,考虑发动机和电机需求功率占比和转速对效率的影响计算得到目标转速,通过目标转速、车速以及主减速比计算得到目标速比,其结构合理,使整车动力得到合理的分配,提高了整车的续航能力和燃油经济性。(The invention belongs to the technical field of hybrid electric vehicle control, and particularly relates to a control method for the maximum speed of a hybrid electric vehicle, which comprises the following steps: receiving vehicle data, receiving vehicle speed, driver required power, engine required power and motor required power, and determining a maximum vehicle speed limit state; step two: acquiring the optimal economic data of the engine and the motor, measuring efficiency maps of the engine and the motor through experiments, and making respective optimal economic curves; step three: the optimal economic rotating speed of the engine and the motor under the respective required power is calculated, the target rotating speed is calculated by considering the required power ratio of the engine and the motor and the influence of the rotating speed on the efficiency, and the target speed ratio is calculated by the target rotating speed, the vehicle speed and the main reduction ratio.)

1. A control method for the maximum speed of a hybrid electric vehicle is characterized in that: the method comprises the following steps:

the method comprises the following steps: receiving vehicle data, receiving vehicle speed, driver required power, engine required power and motor required power, and determining a maximum vehicle speed limit state;

step two: acquiring the optimal economic data of the engine and the motor, measuring efficiency maps of the engine and the motor through experiments, and making respective optimal economic curves;

step three: calculating the optimal economic rotating speeds of the engine and the motor under respective required powers, calculating to obtain a target rotating speed by considering the required power ratio of the engine and the motor and the influence of the rotating speed on efficiency, and calculating to obtain a target speed ratio through the target rotating speed, the vehicle speed and the main reduction ratio;

step four: collecting running road information, recording the speed of a vehicle when the vehicle starts a slope auxiliary control system as an initial speed by a vehicle control unit when the vehicle ascends a slope, simultaneously collecting the current speed of the vehicle in real time, comparing the current speed with the initial speed, and recording the difference value between the current speed and the initial speed;

step five: obtaining a driving signal according to the operation of a driver on an accelerator pedal and a brake pedal, and prejudging the current driving condition of the vehicle according to the driving signal; the vehicle control unit receives current running condition information and simultaneously collects vehicle demand torque and battery SOC state information; reasonably selecting a power distribution scheme according to the current driving working condition, the required torque of the whole vehicle and the SOC state of the battery, and reasonably distributing power;

step six: and sending the distribution result to a speed ratio control actuator for execution.

2. The method for controlling the maximum vehicle speed of the hybrid vehicle according to claim 1, characterized in that: the accelerator pedal stroke and the accelerator pedal stroke change rate are obtained by analyzing and processing signals acquired by an accelerator pedal sensor; the brake pedal stroke and the brake pedal stroke change rate are obtained by analyzing and processing signals acquired by a brake pedal sensor; the vehicle speed is obtained by analyzing and processing signals acquired by a vehicle speed sensor through a signal processor.

3. The method for controlling the maximum vehicle speed of the hybrid vehicle according to claim 1, characterized in that: the method for fuzzy processing comprises the following steps: obtaining the membership grade of the driving working condition by adopting an if-then rule, wherein the membership grade of the driving working condition comprises XC, CS and GS, then resolving ambiguity to obtain a driving working condition signal, and obtaining the current driving working condition by signal processing and analysis, wherein the driving working condition corresponding to the membership grade of the driving working condition XC, CS and GS is as follows: and performing power distribution according to the current running condition, the required torque of the whole vehicle and the SOC state of the battery.

Technical Field

The invention relates to the technical field of hybrid electric vehicle control, in particular to a method for controlling the maximum speed of a hybrid electric vehicle.

Background

With the development of the automobile industry, people pay more and more attention to the environmental protection of automobiles. In order to ensure that the automobile has sufficient power and simultaneously consider environmental protection, the hybrid electric vehicle becomes the mainstream of the current clean energy automobile. The hybrid electric vehicle can make up the defect of short driving range of the pure electric vehicle, and can greatly reduce fuel consumption and exhaust emission compared with the traditional vehicle. The power sources of the hybrid electric vehicle are provided with an engine and a power battery, the vehicle is designed with a maximum speed limiting function in order to ensure the driving safety, but when the vehicle needs to carry out maximum speed control, how to determine the power distribution and the total power of each power source is solved, and meanwhile, the problem that the speed is obviously prevented from being overshot and the speed limiting effect is ensured is solved.

Therefore, a novel method for controlling the maximum speed of the hybrid electric vehicle is provided to solve the problems.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

Therefore, the invention aims to provide a control method of the maximum speed of a hybrid electric vehicle, so that the power of the whole vehicle is reasonably distributed, and the cruising ability and the fuel economy of the whole vehicle are improved.

To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:

a control method for the maximum speed of a hybrid electric vehicle comprises the following steps:

the method comprises the following steps: receiving vehicle data, receiving vehicle speed, driver required power, engine required power and motor required power, and determining a maximum vehicle speed limit state;

step two: acquiring the optimal economic data of the engine and the motor, measuring efficiency maps of the engine and the motor through experiments, and making respective optimal economic curves;

step three: calculating the optimal economic rotating speeds of the engine and the motor under respective required powers, calculating to obtain a target rotating speed by considering the required power ratio of the engine and the motor and the influence of the rotating speed on efficiency, and calculating to obtain a target speed ratio through the target rotating speed, the vehicle speed and the main reduction ratio;

step four: collecting running road information, recording the speed of a vehicle when the vehicle starts a slope auxiliary control system as an initial speed by a vehicle control unit when the vehicle ascends a slope, simultaneously collecting the current speed of the vehicle in real time, comparing the current speed with the initial speed, and recording the difference value between the current speed and the initial speed;

step five: obtaining a driving signal according to the operation of a driver on an accelerator pedal and a brake pedal, and prejudging the current driving condition of the vehicle according to the driving signal; the vehicle control unit receives current running condition information and simultaneously collects vehicle demand torque and battery SOC state information; reasonably selecting a power distribution scheme according to the current driving working condition, the required torque of the whole vehicle and the SOC state of the battery, and reasonably distributing power;

step six: and sending the distribution result to a speed ratio control actuator for execution.

As a preferable aspect of the method for controlling the maximum vehicle speed of the hybrid vehicle according to the present invention, wherein: the accelerator pedal stroke and the accelerator pedal stroke change rate are obtained by analyzing and processing signals acquired by an accelerator pedal sensor; the brake pedal stroke and the brake pedal stroke change rate are obtained by analyzing and processing signals acquired by a brake pedal sensor; the vehicle speed is obtained by analyzing and processing signals acquired by a vehicle speed sensor through a signal processor.

As a preferable aspect of the method for controlling the maximum vehicle speed of the hybrid vehicle according to the present invention, wherein: the method for fuzzy processing comprises the following steps: obtaining the membership grade of the driving working condition by adopting an if-then rule, wherein the membership grade of the driving working condition comprises XC, CS and GS, then resolving ambiguity to obtain a driving working condition signal, and obtaining the current driving working condition by signal processing and analysis, wherein the driving working condition corresponding to the membership grade of the driving working condition XC, CS and GS is as follows: and performing power distribution according to the current running condition, the required torque of the whole vehicle and the SOC state of the battery.

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

1. the current driving working condition of the automobile is judged by fully utilizing the control action of the driver, the driving working condition is accurately and finely divided, the power of the whole automobile is reasonably distributed, and the cruising ability and the fuel economy of the whole automobile are improved.

2. On the basis of ensuring the total output power of the automobile, the output power of the power battery and the output power of the engine are reasonably distributed, and the fuel economy is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise. Wherein:

FIG. 1 is a schematic view of the structure of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The invention provides the following technical scheme: a control method for the maximum speed of a hybrid electric vehicle comprises the following steps:

the method comprises the following steps: receiving vehicle data, receiving vehicle speed, driver required power, engine required power and motor required power, and determining a maximum vehicle speed limit state;

step two: acquiring the optimal economic data of the engine and the motor, measuring efficiency maps of the engine and the motor through experiments, and making respective optimal economic curves;

step three: calculating the optimal economic rotating speeds of the engine and the motor under respective required powers, calculating to obtain a target rotating speed by considering the required power ratio of the engine and the motor and the influence of the rotating speed on efficiency, and calculating to obtain a target speed ratio through the target rotating speed, the vehicle speed and the main reduction ratio;

step four: collecting running road information, recording the speed of a vehicle when the vehicle starts a slope auxiliary control system as an initial speed by a vehicle control unit when the vehicle ascends a slope, simultaneously collecting the current speed of the vehicle in real time, comparing the current speed with the initial speed, and recording the difference value between the current speed and the initial speed;

step five: obtaining a driving signal according to the operation of a driver on an accelerator pedal and a brake pedal, and prejudging the current driving condition of the vehicle according to the driving signal; the vehicle control unit receives current running condition information and simultaneously collects vehicle demand torque and battery SOC state information; reasonably selecting a power distribution scheme according to the current driving working condition, the required torque of the whole vehicle and the SOC state of the battery, and reasonably distributing power;

step six: and sending the distribution result to a speed ratio control actuator for execution.

Wherein: the accelerator pedal stroke and the accelerator pedal stroke change rate are obtained by analyzing and processing signals acquired by an accelerator pedal sensor; the brake pedal stroke and the brake pedal stroke change rate are obtained by analyzing and processing signals acquired by a brake pedal sensor; the vehicle speed is obtained by analyzing and processing signals acquired by a vehicle speed sensor through a signal processor.

Wherein: the method for fuzzy processing comprises the following steps: obtaining the membership grade of the driving working condition by adopting an if-then rule, wherein the membership grade of the driving working condition comprises XC, CS and GS, then resolving ambiguity to obtain a driving working condition signal, and obtaining the current driving working condition by signal processing and analysis, wherein the driving working condition corresponding to the membership grade of the driving working condition XC, CS and GS is as follows: and performing power distribution according to the current running condition, the required torque of the whole vehicle and the SOC state of the battery.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.