CN118024897A

CN118024897A - Control method, control device and storage medium for vehicle range extender system

Info

Publication number: CN118024897A
Application number: CN202410361036.6A
Authority: CN
Inventors: 陈韶新; 连凤霞; 孙明峰
Original assignee: Weichai New Energy Power Technology Co ltd; Weichai Power Co Ltd
Current assignee: Weichai New Energy Power Technology Co ltd; Weichai Power Co Ltd
Priority date: 2024-03-27
Filing date: 2024-03-27
Publication date: 2024-05-14

Abstract

The application provides a control method, a control device and a storage medium of a vehicle range extender system, wherein the method comprises the following steps: judging whether the vehicle has a torque limiting fault or not; under the condition that the vehicle has a torque limiting fault, a first rotating speed range is determined, and the rotating speed of the engine is always the same as that of the motor; acquiring target power of a vehicle; under the condition that a target rotating speed corresponding to target power exists in a first rotating speed range, determining the target rotating speed from the first rotating speed range at least according to the target power, and determining target torque, wherein the target rotating speed and the target torque are corresponding rotating speeds and torques when the torque limiting fault occurs and the range extender system operates according to the target power by adopting the highest efficiency; the rotational speed of the engine and the rotational speed of the motor are adjusted to the target rotational speed, and the torque of the engine and the torque of the motor are adjusted to the target torque. According to the method, the optimal efficiency working point in the available working area of the system is found, so that the high-efficiency operation of the system is ensured while the power requirement is met.

Description

Control method, control device and storage medium for vehicle range extender system

Technical Field

The present application relates to the field of vehicle range extender control, and more particularly, to a control method of a vehicle range extender system, a control device of a vehicle range extender system, a computer-readable storage medium, and an electronic device.

Background

A range extender for a vehicle is a device for extending the range of a vehicle. The device can help the vehicle save fuel, reduce exhaust emission and improve the fuel utilization rate. Range extenders typically use hydrogen, natural gas, methanol, or other renewable energy sources as fuel to produce energy through chemical reactions to provide additional power to the vehicle. Therefore, the endurance mileage of the automobile can be prolonged, the dependence on traditional fuel oil is reduced, and the automobile is more friendly to the environment.

The range extender may provide additional electrical energy or increase output power to address complex operating conditions. For the power request of a vehicle control unit (Vehicle Control Unit, VCU for short), the range extender combines the external characteristic curves and the high-efficiency intervals of the engine and the motor to provide a power output curve with highest efficiency. When the actual operation condition is severe and complex, torque limitation can be made on the engine and the motor for protecting the range extender system.

When the whole vehicle has a heat radiation function fault or hardware faults of the motor and the engine, the available working interval of the motor or the engine can be reduced, the motor controller and the engine controller can reduce the maximum available torque of the motor or the engine, the range extender system is limited in torque, the output power is limited, and when the required power of the whole vehicle is larger, the power requirement of the whole vehicle cannot be met.

Disclosure of Invention

The application mainly aims to provide a control method of a vehicle range extender system, a control device of the vehicle range extender system, a computer readable storage medium and electronic equipment, so as to at least solve the problem that the output power of the range extender is limited after a torque limiting fault occurs in a vehicle in the prior art, so that the high power requirement of the vehicle cannot be met.

In order to achieve the above object, according to one aspect of the present application, there is provided a control method of a vehicle range extender system including an engine of a vehicle and an electric motor of the vehicle, the method comprising: judging whether the vehicle has a torque limiting fault or not; determining a first rotation speed range under the condition that the torque limiting fault occurs in the vehicle, wherein the first rotation speed range is the maximum rotation speed range of the engine and the motor after the torque limiting fault occurs in the vehicle, and the rotation speed of the engine is always the same as the rotation speed of the motor; acquiring target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment; determining a target rotating speed from the first rotating speed range according to at least the target power under the condition that the target rotating speed corresponding to the target power exists in the first rotating speed range, and determining a target torque, wherein the target rotating speed and the target torque are respectively corresponding rotating speeds and torques when the range extender system operates according to the target power with the highest efficiency after the torque limiting fault occurs; the rotational speed of the engine and the rotational speed of the motor are adjusted to the target rotational speed, and the torque of the engine and the torque of the motor are adjusted to the target torque.

Optionally, determining the target rotational speed from the first rotational speed range and determining a target torque based at least on the target power includes: acquiring the environmental temperature in the environment where the range extender system is located at the current moment; determining a motor operating condition MAP corresponding to the ambient temperature, the motor operating condition MAP representing a mapping relationship between a rotational speed of the motor, a torque of the motor, and an efficiency of the motor, and an engine universal characteristic representing a mapping relationship between a rotational speed of the engine, a torque of the engine, and an efficiency of the engine; and inputting the target power, the first rotation speed range, the motor working condition MAP table and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque.

Optionally, the optimizing algorithm is one of the following: genetic algorithm, simulated annealing algorithm, swarm intelligence algorithm, and particle swarm algorithm.

Optionally, inputting the target power, the first rotation speed range, the motor operating mode MAP table and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining output of the optimizing algorithm as the target rotation speed and the target torque, including: determining an optimizing objective function eta _Tmax＝f₁(n_M,η_eff×T_E)×f₂(n_E,T_E) and an efficiency range, wherein eta _Tmax is a target maximum efficiency, the target maximum efficiency is the highest efficiency of the range extender system after the torque limiting fault occurs, f ₁(n_M,T_M) is an efficiency function of the motor, f ₂(n_E,T_E) is an efficiency function of the engine, n _M is the rotating speed of the motor, T _M is the torque of the motor, n _E is the rotating speed of the engine, T _E is the torque of the engine, eta _eff is the torque utilization rate of the engine, T _M＝η_eff×T_E, and the efficiency range is [0, 100% ]; determining algorithm parameters, wherein the algorithm parameters at least comprise: particle number, learning factor, inertial weight, maximum acceleration, number of iterations, initial position and velocity of particles; and according to the optimizing target function, the efficiency range and the algorithm parameters, the target power, the first rotation speed range, the motor working condition MAP table and the universal characteristic curve of the engine are used as input values to an optimizing algorithm, and the output of the optimizing algorithm is obtained to be the target rotation speed and the target torque.

Optionally, inputting the target power, the first rotation speed range, the motor operating mode MAP table and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining output of the optimizing algorithm as the target rotation speed and the target torque, including: determining a plurality of preparation working points according to the target power, the first rotation speed range, the motor working condition MAP table and the universal characteristic curve of the engine, wherein the power of the vehicle when running at each preparation working point is the target power, one preparation working point corresponds to one preparation rotation speed and one preparation torque, and each preparation rotation speed is in the first rotation speed range; respectively determining the working efficiency corresponding to each preparation working point to obtain a plurality of working efficiencies, wherein the working efficiency of the preparation working point is related to the efficiency of the motor and the efficiency of the engine corresponding to the preparation working point; comparing the working efficiency, and determining the working efficiency with the highest value as the highest efficiency of the range extender system after the torque limiting fault occurs; and determining the preparation working point corresponding to the highest efficiency as a target working point, and determining the preparation rotating speed and the preparation torque corresponding to the target working point as the target rotating speed and the target torque.

Optionally, after obtaining the target power of the vehicle, the method further comprises: and reducing the power value of the target power until the maximum reduction number is reached or the target rotating speed corresponding to the target power exists in the first rotating speed range under the condition that the target rotating speed corresponding to the target power does not exist in the first rotating speed range.

Optionally, after determining whether the vehicle has a torque limiting failure, the method further includes: under the condition that the vehicle does not have the torque limiting fault, acquiring the target power and the actual power of the vehicle at the current moment; increasing torque of the engine such that the actual power is equal to the target power, in a case where the actual power is smaller than the target power; reducing torque of the engine such that the actual power is equal to the target power, in a case where the actual power is greater than the target power; and under the condition that the actual power is equal to the target power, keeping the torque of the engine at the current moment unchanged.

According to another aspect of the present application, there is provided a control device of a vehicle range extender system including an engine of a vehicle and an electric motor of the vehicle, the device comprising: the judging unit is used for judging whether the vehicle has a torque limiting fault or not; a first determining unit, configured to determine a first rotation speed range when the torque limiting fault occurs in the vehicle, where the first rotation speed range is a maximum rotation speed range of the engine and the motor after the torque limiting fault occurs in the vehicle, and the rotation speed of the engine is always the same as the rotation speed of the motor; the acquisition unit is used for acquiring the target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment; a second determining unit, configured to determine, in a case where a target rotational speed corresponding to the target power exists in the first rotational speed range, the target rotational speed from the first rotational speed range according to at least the target power, and determine a target torque, where the target rotational speed and the target torque are respectively a rotational speed and a torque corresponding to when the range extender system operates with the highest efficiency according to the target power after the torque limiting failure occurs; an adjusting unit that adjusts a rotation speed of the engine and a rotation speed of the motor to the target rotation speed, and adjusts a torque of the engine and a torque of the motor to the target torque.

According to another aspect of the present application, there is provided a computer-readable storage medium including a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute any one of the control methods of the vehicle range extender system.

According to another aspect of the present application, there is provided an electronic apparatus including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising a control method for executing any one of the vehicle range extender systems.

By applying the technical scheme of the application, the control method of the vehicle range extender system comprises the steps that firstly, whether the vehicle has a torque limiting fault or not is judged; then, under the condition that the torque limiting fault occurs in the vehicle, a first rotating speed range is determined, wherein the first rotating speed range is the maximum rotating speed range of the engine and the motor after the torque limiting fault occurs in the vehicle, and the rotating speed of the engine is always the same as that of the motor; then, obtaining target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment; determining a target rotating speed from the first rotating speed range according to at least the target power under the condition that the target rotating speed corresponding to the target power exists in the first rotating speed range, and determining a target torque, wherein the target rotating speed and the target torque are respectively corresponding rotating speeds and torques when the range extender system operates according to the target power with the highest efficiency after the torque limiting fault occurs; finally, the rotational speed of the engine and the rotational speed of the motor are adjusted to the target rotational speed, and the torque of the engine and the torque of the motor are adjusted to the target torque. According to the method, through characteristic analysis of the range extender system, an efficiency optimal working point in a usable working area of the system is found, the high-efficiency operation of the system is ensured while the power requirement is met, and the problem that the high-power requirement of the vehicle cannot be met due to the fact that the output power of the range extender is limited after the vehicle has a torsion limiting fault in the prior art is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

Fig. 1 shows a flow chart of a control method of a range extender system for a vehicle according to an embodiment of the application;

FIG. 2 is a schematic diagram of a control method of a vehicle range extender system in the event of a torque limiter fault according to an embodiment of the present application;

FIG. 3 illustrates a schematic diagram of a control method for a vehicle range extender system in the event of an infinite torsion fault, according to an embodiment of the present application;

FIG. 4 is a flow chart of another method of controlling a range extender system for a vehicle according to an embodiment of the present application;

FIG. 5 shows a block diagram of a control device for a range extender system for a vehicle, provided in accordance with an embodiment of the present application;

Fig. 6 shows a block diagram of a control device of another vehicle range extender system according to an embodiment of the application.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As described in the background art, in the prior art, when the heat dissipation function of the whole vehicle is faulty or the hardware of the motor or the engine is faulty, the available working interval of the motor or the engine is reduced, the motor controller and the engine controller reduce the maximum available torque of the motor or the engine, the range extender system is limited in output power, and when the required power of the whole vehicle is high, the power requirement of the whole vehicle cannot be met, so as to solve the problem that the high power requirement of the vehicle cannot be met due to the limitation of the output power of the range extender after the torsion limitation fault of the vehicle in the prior art.

The technical solutions in 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.

In the present embodiment, a control method of a range extender system for a vehicle operating on a mobile terminal, a computer terminal, or the like is provided, and it is to be noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order different from that shown or described herein.

Fig. 1 is a flowchart of a control method of a range extender system for a vehicle according to an embodiment of the application. As shown in fig. 1, the range extender system for a vehicle includes an engine of the vehicle and an electric motor of the vehicle, the method comprising the steps of:

step S101, judging whether the vehicle has a torque limiting fault or not;

In particular, a range extender for a vehicle is a device for extending the range of a vehicle. The device can help the vehicle save fuel, reduce exhaust emission and improve the fuel utilization rate. Range extenders typically use hydrogen, natural gas, methanol, or other renewable energy sources as fuel to produce energy through chemical reactions to provide additional power to the vehicle. Therefore, the endurance mileage of the automobile can be prolonged, and the utilization rate of the traditional fuel oil by the automobile is reduced, so that a certain protection effect on the environment is achieved.

The range extender may provide additional electrical energy or increase output power to address complex operating conditions. Aiming at a power request of a vehicle electric control unit (Vehicle Control Unit, VCU for short), the range extender combines the external characteristic curves and high-efficiency intervals of an engine and a motor to provide a power output curve with highest efficiency. When actual operation conditions are severe and complicated, torque limitation can be made on the engine and the motor for protecting the range extender system, when the heat dissipation function of the whole vehicle is failed or the motor and the hardware of the engine are failed, the available working interval of the motor or the engine can be reduced, the motor controller and the engine controller can reduce the maximum available torque of the motor or the engine, the range extender system is limited, the output power is limited, and when the required power of the whole vehicle is high, the power requirement of the whole vehicle cannot be met. Therefore, when the engine or the motor is required to be limited in torsion, the range extender system can still generate power with the highest efficiency, and the power request of the VCU is met.

Step S102, when the torque limiting fault occurs in the vehicle, determining a first rotation speed range, wherein the first rotation speed range is the maximum rotation speed range of the engine and the motor after the torque limiting fault occurs in the vehicle, and the rotation speed of the engine is always the same as the rotation speed of the motor;

In particular, since the engine and the motor of the vehicle are actually of a coaxial structure, the rotational speed of the engine and the rotational speed of the motor are substantially the same at all times, i.e., the rotational speed of the engine is adjusted or the rotational speed of the motor is adjusted to be substantially the same. Similarly, the torque of the engine and the torque of the motor are always the same.

Step S103, obtaining the target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment;

Specifically, the target power of the vehicle is actually the power required by the whole vehicle at the current moment, where the power required by the whole vehicle refers to the total power required by the whole vehicle when running, and the total power includes the power requirements of an engine, a transmission system, auxiliary equipment and the like. This value is typically determined by the vehicle manufacturer during the design and production process and is calculated and validated based on factors such as the type, size, weight, powertrain, etc. of the vehicle. The power required by the whole vehicle directly influences the power performance, fuel economy, running stability and other aspects of the vehicle.

Step S104, when a target rotating speed corresponding to the target power exists in the first rotating speed range, determining the target rotating speed from the first rotating speed range according to at least the target power, and determining a target torque, wherein the target rotating speed and the target torque are respectively corresponding rotating speed and torque when the range extender system operates according to the target power with the highest efficiency after the torque limiting fault occurs;

Specifically, when a torque limiting fault occurs and the optimal working point of the system efficiency cannot meet the power demand at the current moment, a new optimal working point of the torque limiting range extender system meeting the power demand and having the highest efficiency is found through an optimizing algorithm, and the running state of the range extender system is adjusted to the optimal working point to run, so that the system efficiency is improved while the power demand of the whole vehicle is met.

Wherein determining the target rotational speed from the first rotational speed range and determining the target torque based at least on the target power comprises the steps of:

Step S201, obtaining the environmental temperature in the environment where the range extender system is located at the current moment;

step S202, determining a motor operating mode MAP table corresponding to the ambient temperature and a universal engine characteristic curve, wherein the motor operating mode MAP table represents a mapping relation among the rotating speed of the motor, the torque of the motor and the efficiency of the motor, and the universal engine characteristic curve represents a mapping relation among the rotating speed of the engine, the torque of the engine and the efficiency of the engine;

Step S203, inputting the target power, the first rotation speed range, the motor condition MAP table, and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque.

Specifically, when the torque limiting fault occurs in the system, the working point optimizing is performed in the available working area of the system aiming at the target power, and if the working point in the available working area of the system meets the power requirement, the working point with the optimal efficiency is output, so that the vehicle can meet the power requirement and simultaneously ensure the high-efficiency operation of the system.

Wherein the optimizing algorithm is one of the following: genetic algorithm, simulated annealing algorithm, swarm intelligence algorithm, and particle swarm algorithm.

Specifically, the optimizing algorithm is used for optimizing the working point in the available working area of the system, so that the optimizing efficiency of the system can be improved, and the optimal working point can be accurately found. In practical application, a proper optimizing algorithm can be selected for optimizing according to practical conditions.

The target power, the first rotation speed range, the motor condition MAP table, and the universal characteristic curve of the engine are input as input values into an optimizing algorithm, and the output of the optimizing algorithm is the target rotation speed and the target torque, comprising the following steps:

Step S301 of determining an optimizing objective function η _Tmax＝f₁(n_M,η_eff×T_E)×f₂(n_E,T_E) and an efficiency range, wherein η _Tmax is a target maximum efficiency, the target maximum efficiency is a maximum efficiency of the range extender system after the torque limiting fault occurs, f ₁(n_M,T_M) is an efficiency function of the motor, f ₂(n_E,T_E) is an efficiency function of the engine, n _M is a rotation speed of the motor, T _M is a torque of the motor, n _E is a rotation speed of the engine, T _E is a torque of the engine, η _eff is a torque utilization rate of the engine, T _M＝η_eff×T_E is a torque range of [0, 100% ];

Step S302, determining algorithm parameters, where the algorithm parameters at least include: particle number, learning factor, inertial weight, maximum acceleration, number of iterations, initial position and velocity of particles;

Step S303, inputting the target power, the first rotation speed range, the motor operating mode MAP table and the universal characteristic curve of the engine as input values into an optimizing algorithm according to the optimizing target function, the efficiency range and the algorithm parameters, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque.

Specifically, the optimal working point can be accurately found.

Here, let the motor (hereinafter simply referred to as the motor) efficiency be η _M, the engine efficiency be η _E, the range extender system efficiency be η _T, and the range extender system efficiency η _T＝η_E×η_M when the system efficiency loss is not considered. Let motor speed n _M, torque T _M, engine speed n _E, torque T _E, according to the Map of the motor and the universal characteristic curve of the engine, the working environment is unchanged, the efficiency of the motor and the engine have a mapping relationship with the corresponding rotational speed and torque, the motor efficiency can be represented as η _M＝f₁(n_M,T_M), and the engine efficiency can be represented as η _E＝f₂(n_E,T_E.

Wherein torque and torque are actually different names of the same physical quantity, and there is no substantial distinction between them. In physics and engineering, torque and torque are generally used to describe the moment action to which an object is subjected, i.e., the effect of a moment along the axis of rotation of the object. The unit of torque and torque is newton-meters (n·m), which represents the moment generated per unit force over a unit distance. Thus, torque and torque may be used interchangeably and are related by different names of the same physical quantity. Thus, the torques and torques above and below are meant to be the same.

The optimizing objective function can be expressed as η _Tmax＝f₁(n_M,T_M)×f₂(n_E,T_E). Under the power generation working condition, the engine rotating speed is consistent with the motor rotating speed, the engine output torque is slightly larger than the motor power generation torque, the engine torque utilization rate is eta _eff, and the objective function can be expressed as eta _Tmax＝f₁(n_M,η_eff×T_E)×f₂(n_E,T_E. By taking the motor over-temperature torque limiting as an example, the maximum available torque of different rotating speeds at the current temperature can be obtained through a table look-up mode, the current target power is matched, and meanwhile, the working point with the optimal efficiency is found. When the required power is determined, the efficiency of each working point of the motor and the engine is also determined, so that the optimal working point of the efficiency of the usable working section of the range extender system under the torque limiting working condition can be obtained through an optimizing algorithm by inputting the variable n _E、η_E、η_M.

As shown in fig. 2, since the MAP table and the universal characteristic curve of the engine are affected by temperature, that is, the MAP table of the same motor is different in different environments, the universal characteristic curve of the engine is also different in the same engine, so that the MAP table and the universal characteristic curve of the engine are first determined according to the environmental temperature at the current time, and then the rotation speed of the range extender system (that is, the allowable rotation speed range of the range extender after the torque limitation of the vehicle, that is, the allowable rotation speed range of the motor and the engine after the torque limitation of the vehicle) is input. And determining the motor rotating speed and the corresponding motor torque which can realize the system target power output according to the range extender system rotating speed and the motor MAP table to obtain a plurality of preparation motor working points, and determining the engine torque which can realize the engine rotating speed corresponding to the system target power output according to the range extender system rotating speed and the universal characteristic curve of the engine to obtain a plurality of preparation engine working points. Since there are many operating points that can satisfy the condition that the system outputs the target power, but the efficiency of different operating points is different, there are a plurality of the preliminary motor operating points and the preliminary engine operating points, respectively. And then determining the motor working efficiency corresponding to each preparation motor working point, determining the engine working efficiency corresponding to each preparation engine working point, carrying out working point optimizing according to all motor working efficiencies and all engine working efficiencies, finally finding out the motor optimal working point and the engine final working point with highest efficiency under the condition of realizing the system target power output, and finally outputting the optimal working point parameters. The optimal operating point parameters include motor speed, motor torque, engine speed and engine torque.

Wherein the target power, the first rotation speed range, the motor condition MAP table, and the engine universal characteristic curve are input as input values to an optimizing algorithm, and the output of the optimizing algorithm is the target rotation speed and the target torque, comprising:

Step S401, determining a plurality of preparation working points according to the target power, the first rotation speed range, the motor working condition MAP table and the universal characteristic curve of the engine, wherein the power of the vehicle when running at each preparation working point is the target power, one preparation working point corresponds to one preparation rotation speed and one preparation torque, and each preparation rotation speed is in the first rotation speed range;

step S402, respectively determining the working efficiency corresponding to each preparation working point to obtain a plurality of working efficiencies, wherein the working efficiency of the preparation working point is related to the efficiency of the motor corresponding to the preparation working point and the efficiency of the engine;

Step S403, comparing the magnitudes of the working efficiencies, and determining the working efficiency with the highest value as the highest efficiency of the range extender system after the torque limiting fault occurs;

And step S404, determining the preliminary operation point corresponding to the highest efficiency as a target operation point, and determining the preliminary rotation speed and the preliminary torque corresponding to the target operation point as the target rotation speed and the target torque.

Specifically, since there are many working points that can meet the condition that the system outputs the target power, but the efficiency of different working points is different, it is necessary to compare the efficiency of the preliminary working points, and obtain the preliminary working point with the highest efficiency as the target working point, and make the range extender system operate by adopting the operation parameters of the target working point, so as to ensure the high-efficiency operation of the system while meeting the power requirement.

Step S105 of adjusting the rotation speed of the engine and the rotation speed of the motor to the target rotation speed, and adjusting the torque of the engine and the torque of the motor to the target torque.

Specifically, when a torque limiting fault occurs in the system, the working point at the previous moment cannot meet the power requirement, through characteristic analysis of the range extender system, the rotation speed n _E of the range extender, the efficiency eta _E of the engine and the efficiency eta _M of the motor are taken as input, eta _Tmax＝f₁(n_M,T_M)×f₂(n_E,T_E) is taken as an objective function, the optimal working point of the efficiency in the available working area of the system is searched, and the high-efficiency operation of the system is ensured while the power requirement is met. When the system has a torsion limiting fault, searching for a substitute working point in a system available working area by taking the optimal efficiency as an objective function.

Wherein, after obtaining the target power of the vehicle, the method further comprises: and decreasing a power value of the target power until a maximum number of decreases is reached or the target rotational speed corresponding to the target power is present in the first rotational speed range, when the target rotational speed corresponding to the target power is not present in the first rotational speed range.

In particular, the power requirement can be properly reduced, so that the vehicle system can still work at the optimal working point after the power is reduced, and the high-efficiency operation of the system is ensured.

Wherein the percentage of the primary reduction in power is determined based on the maximum rotational speed and torque of the motor and the engine.

After judging whether the vehicle has a torque limiting fault, the method further comprises the following steps:

Step S501, acquiring the target power and the actual power of the vehicle at the current moment when the torque limiting fault does not occur in the vehicle;

Step S502, when the actual power is smaller than the target power, increasing the torque of the engine so that the actual power is equal to the target power;

step S503 of reducing torque of the engine so that the actual power is equal to the target power when the actual power is greater than the target power;

step S504, when the actual power is equal to the target power, the torque of the engine is kept unchanged at the current time.

Specifically, according to the difference value between the required power and the actual power generated by the motor, the torque of the engine is adjusted, so that the actual power generated by the motor quickly approaches the required power value.

The range extender generally adopts a control mode of engine torque control and motor rotation speed control. Under the condition that the parts of the whole vehicle are infinitely twisted or the power limiting fault is reported, the range extender obtains the target rotating speed of the motor with highest efficiency under the current demand power by inquiring the efficiency MAP of the motor according to the demand power of the VCU, and adjusts the torque of the engine according to the difference value between the demand power and the actual power generation power of the motor, so that the actual power generation power of the motor is quickly approaching to the demand power value. And when the system state is normal, the range extender system acquires the system working point by checking the Map.

As shown in fig. 3, the VCU determines the required power of the vehicle, then inputs the required power into an efficiency MAP table of the motor, the efficiency MAP table of the motor represents a mapping relationship between the required power and a motor rotation speed with highest efficiency when the required power is satisfied, then determines the motor rotation speed with highest efficiency when the required power is satisfied through the efficiency MAP table of the motor, and sends the determined motor rotation speed to the MCU, and then the MCU controls the motor to operate according to the determined rotation speed. And then obtaining the actual output power of the motor when the motor runs according to the determined motor rotating speed, calculating the difference value between the actual output power and the required power, inputting the difference value into the PID, outputting the target engine torque to the VCU by the PID, and controlling the engine to run according to the target engine torque by the VCU so as to enable the actual output power to be equal to the required power. The PID negative feedback is adopted to continue the screwing control, the target value is the required power, and the feedback value is the actual power generation power of the motor.

According to the control method of the vehicle range extender system, the vehicle range extender system comprises an engine of a vehicle and a motor of the vehicle, and whether the vehicle has a torque limiting fault or not is judged; then, when the torque limiter fault occurs in the vehicle, determining a first rotation speed range, wherein the first rotation speed range is a maximum rotation speed range of the engine and the motor after the torque limiter fault occurs in the vehicle, and the rotation speed of the engine is always the same as the rotation speed of the motor; then, obtaining the target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment; when there is a target rotational speed corresponding to the target power in the first rotational speed range, determining the target rotational speed from the first rotational speed range based on at least the target power, and determining a target torque, wherein the target rotational speed and the target torque are a rotational speed and a torque corresponding to a case where the range extender system operates at the target power with the highest efficiency after the torque limiting failure occurs, respectively; finally, the rotational speed of the engine and the rotational speed of the motor are adjusted to the target rotational speed, and the torque of the engine and the torque of the motor are adjusted to the target torque. According to the method, through characteristic analysis of the range extender system, an efficiency optimal working point in a usable working area of the system is found, the high-efficiency operation of the system is ensured while the power requirement is met, and the problem that the high-power requirement of the vehicle cannot be met due to the fact that the output power of the range extender is limited after the vehicle has a torsion limiting fault in the prior art is solved.

In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the control method of the range extender system for a vehicle of the present application will be described in detail below with reference to specific embodiments.

The embodiment relates to a control method of a specific vehicle range extender system, as shown in fig. 4, including the following steps:

step S1: determining a required power of the vehicle, and then inputting the required power to a range extender system of the vehicle;

Step S2: judging whether the vehicle triggers a torque limiting fault, determining a rated working point capable of meeting the power required by the vehicle by checking MAP under the condition that the torque limiting fault does not occur, adjusting the rotation speed and the torque of the motor and the engine to parameters corresponding to the rated working point, adjusting the rotation speed and the torque of the motor and the engine under the condition that the torque limiting fault is triggered, and searching the rotation speed and the torque of the motor and the engine at the optimal working point according to an optimizing function;

step S3: the rotation speed and the torque of the motor and the engine are regulated to parameters corresponding to the optimal working point, and the torque and the rotation speed of the optimal working point are output;

Step S4: under the condition that the optimal working point cannot be found by the optimizing function, if the fact that the power requirement of the vehicle cannot be met under the current condition is proved, a prompting signal is output, and the fact that the power requirement of the vehicle cannot be met when the optimal working point cannot be found under the current condition is prompted.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

The embodiment of the application also provides a control device of the vehicle range extender system, and the control device of the vehicle range extender system can be used for executing the control method for the vehicle range extender system. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The following describes a control device of a range extender system for a vehicle provided by an embodiment of the present application.

Fig. 5 is a schematic diagram of a control device of a vehicle range extender system according to an embodiment of the application, the vehicle range extender system including an engine of a vehicle and an electric motor of the vehicle. As shown in fig. 5, the apparatus includes a judging unit 10, a first determining unit 20, an acquiring unit 30, a second determining unit 40, and an adjusting unit 50, the judging unit 10 being configured to judge whether or not the vehicle has a torque limiter failure; the first determining unit 20 is configured to determine a first rotation speed range when the torque limiter fault occurs in the vehicle, where the first rotation speed range is a maximum rotation speed range between the engine and the motor after the torque limiter fault occurs in the vehicle, and the rotation speed of the engine is always the same as the rotation speed of the motor; the obtaining unit 30 is configured to obtain a target power of the vehicle, where the target power is a required power of the vehicle at a current time; the second determining unit 40 is configured to determine, in a case where a target rotational speed corresponding to the target power exists in the first rotational speed range, the target rotational speed from the first rotational speed range based on at least the target power, and determine a target torque, where the target rotational speed and the target torque are respectively a rotational speed and a torque corresponding to when the range extender system operates at the target power with the highest efficiency after the torque limiting failure occurs; the adjusting unit 50 is configured to adjust the rotation speed of the engine and the rotation speed of the motor to the target rotation speed, and adjust the torque of the engine and the torque of the motor to the target torque.

The control device of the vehicle range extender system comprises a vehicle engine and a vehicle motor, wherein the device comprises a judging unit, a first determining unit, an acquiring unit, a second determining unit and an adjusting unit, and the judging unit is used for judging whether the vehicle has a torque limiting fault or not; a first determining unit configured to determine a first rotation speed range when the torque limiter failure occurs in the vehicle, the first rotation speed range being a maximum rotation speed range between the engine and the motor after the torque limiter failure occurs in the vehicle, the rotation speed of the engine being the same as the rotation speed of the motor; the acquisition unit is used for acquiring the target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment; the second determining unit is configured to determine, when there is a target rotational speed corresponding to the target power in the first rotational speed range, the target rotational speed from the first rotational speed range according to at least the target power, and determine a target torque, where the target rotational speed and the target torque are respectively a rotational speed and a torque corresponding to when the range extender system operates at the target power with the highest efficiency after the torque limiting failure occurs; the adjusting unit is used for adjusting the rotation speed of the engine and the rotation speed of the motor to the target rotation speed, and adjusting the torque of the engine and the torque of the motor to the target torque. The device is through the characteristic analysis to the journey ware system, seeks the efficiency optimum operating point in the available work district of system, when satisfying the power demand, guarantees the high-efficient operation of system, solves among the prior art when the vehicle takes place to limit and turns round the problem that the output of journey ware receives the restriction and leads to unable high-power demand that satisfies the vehicle behind the trouble.

In some alternative examples, as shown in fig. 6, the second determining unit includes a first obtaining module 41, a first determining module 42, and an optimizing module 43, where the first obtaining module 41 is configured to obtain an ambient temperature in an environment where the range extender system is located at a current time; the first determining module 42 is configured to determine a motor operating condition MAP corresponding to the ambient temperature, the motor operating condition MAP representing a mapping relationship between a rotational speed of the motor, a torque of the motor, and an efficiency of the motor, and an engine universal characteristic curve representing a mapping relationship between the rotational speed of the engine, the torque of the engine, and the efficiency of the engine; the optimizing module 43 is configured to input the target power, the first rotation speed range, the motor condition MAP table, and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtain the output of the optimizing algorithm as the target rotation speed and the target torque. Therefore, when the torque limiting fault occurs in the system, the working point optimizing is performed in the available working area of the system aiming at the target power, and if the working point in the available working area of the system meets the power requirement, the working point with the optimal efficiency is output, so that the vehicle can meet the power requirement and simultaneously ensure the high-efficiency operation of the system.

In some alternative examples, the above-described optimization algorithm is one of the following: genetic algorithm, simulated annealing algorithm, swarm intelligence algorithm, and particle swarm algorithm. The optimizing algorithm is used for optimizing the working points in the available working area of the system, so that the optimizing efficiency of the system can be improved, and the optimal working points can be accurately found.

In this embodiment, the optimizing module includes a first determining submodule, a second determining submodule, and an optimizing submodule, where the first determining submodule is used to determine an optimizing objective function η _Tmax＝f₁(n_M,η_eff×T_E)×f₂(n_E,T_E) and an efficiency range, where ηt _max is a target maximum efficiency, where the target maximum efficiency is a maximum efficiency of the range extender system after the torque limiter failure occurs, f ₁(n_M,T_M) is an efficiency function of the motor, f ₂(n_E,T_E) is an efficiency function of the engine, n _M is a rotational speed of the motor, T _M is a torque of the motor, n _E is a rotational speed of the engine, T _E is a torque of the engine, η ^eff is a torque utilization rate of the engine, and T _M＝η_eff×T_E is [0, 100% ]; the second determining submodule is used for determining algorithm parameters, and the algorithm parameters at least comprise: particle number, learning factor, inertial weight, maximum acceleration, number of iterations, initial position and velocity of particles; the optimizing sub-module is configured to input the target power, the first rotation speed range, the motor operating mode MAP table, and the engine universal characteristic curve as input values into an optimizing algorithm according to the optimizing objective function, the efficiency range, and the algorithm parameter, and obtain the output of the optimizing algorithm as the target rotation speed and the target torque. Thus, the optimal working point can be accurately found.

An alternative scheme, the optimizing module comprises a third determining submodule, a fourth determining submodule, a fifth determining submodule and a sixth determining submodule, wherein the third determining submodule is used for determining a plurality of preparation working points according to the target power, the first rotating speed range, the motor working condition MAP table and the universal characteristic curve of the engine, the power of the vehicle when running at each preparation working point is the target power, one preparation working point corresponds to one preparation rotating speed and one preparation torque, and each preparation rotating speed is in the first rotating speed range; a fourth determination submodule for determining the working efficiency corresponding to each of the preliminary working points to obtain a plurality of working efficiencies, wherein the working efficiency of the preliminary working points is related to the efficiency of the motor corresponding to the preliminary working points and the efficiency of the engine; a fifth determining submodule is used for comparing the working efficiency, and determining the working efficiency with the highest value as the highest efficiency of the range extender system after the torque limiting fault occurs; and a sixth determination submodule configured to determine the preliminary operating point corresponding to the highest efficiency as a target operating point, and determine the preliminary rotational speed and the preliminary torque corresponding to the target operating point as the target rotational speed and the target torque. The system can be ensured to operate with high efficiency while meeting the power requirement.

In some alternative examples, the first determining module includes an adjusting sub-module configured to reduce the power value of the target power until a maximum reduction number is reached or the target rotational speed corresponding to the target power exists in the first rotational speed range if the target rotational speed corresponding to the target power does not exist in the first rotational speed range. Therefore, the power requirement can be properly reduced, so that the vehicle system can still work at the optimal working point after the power is reduced, and the high-efficiency operation of the system is ensured.

As an optional solution, the apparatus further includes a second obtaining module, a first adjusting module, a second adjusting module, and a third adjusting module, where the second obtaining module is configured to obtain, after determining whether the vehicle has a torque limiter fault, the target power and an actual power of the vehicle at a current time when the vehicle has not the torque limiter fault; the first regulating module is used for increasing the torque of the engine so that the actual power is equal to the target power when the actual power is smaller than the target power; the second regulating module is used for reducing the torque of the engine so that the actual power is equal to the target power when the actual power is greater than the target power; the third regulation module is used for keeping the torque of the engine unchanged at the current moment under the condition that the actual power is equal to the target power. And adjusting the torque of the engine according to the difference value between the required power and the actual power generated by the motor, so that the actual power generated by the motor quickly approaches the required power value.

The control device of the vehicle range extender system comprises a processor and a memory, wherein the judging unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; or the above modules may be located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the problem that the high power requirement of the vehicle cannot be met due to the fact that the output power of the range extender is limited after the vehicle has a torque limiting fault in the prior art is solved by adjusting the parameters of the inner core.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the computer readable storage medium is located to execute a control method of the vehicle range extender system.

Specifically, the control method of the vehicle range extender system includes:

step S101, judging whether the vehicle has a torque limiting fault or not;

Specifically, when a torque limiting fault occurs in the system, the working point at the previous moment cannot meet the power requirement, through characteristic analysis of the range extender system, the rotation speed n ^E of the range extender, the efficiency eta _E of the engine and the efficiency eta _M of the motor are taken as input, eta _Tmax＝f₁(n_M,T_M)×f₂(n_E,T_E) is taken as an objective function, the optimal working point of the efficiency in the available working area of the system is searched, and the high-efficiency operation of the system is ensured while the power requirement is met. When the system has a torsion limiting fault, searching for a substitute working point in a system available working area by taking the optimal efficiency as an objective function.

Optionally, determining the target rotational speed from the first rotational speed range and determining the target torque at least according to the target power includes: acquiring the environmental temperature in the environment where the range extender system is located at the current moment; determining a motor operating MAP corresponding to the ambient temperature, the motor operating MAP representing a mapping between a rotational speed of the motor, a torque of the motor, and an efficiency of the motor, and an engine universal characteristic curve representing a mapping between a rotational speed of the engine, a torque of the engine, and an efficiency of the engine; and inputting the target power, the first rotation speed range, the motor operating condition MAP table and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque.

Optionally, the above-mentioned optimizing algorithm is one of the following: genetic algorithm, simulated annealing algorithm, swarm intelligence algorithm, and particle swarm algorithm.

Optionally, inputting the target power, the first rotation speed range, the motor condition MAP table, and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque, including: determining an optimizing objective function η _Tmax＝f₁(n_M,T_M)×f₂(n_E,η_eff×T_E) and an efficiency range, wherein η ^T _max is a target maximum efficiency, the target maximum efficiency is a maximum efficiency of the range extender system after the torque limiting fault occurs, f ₁(n_M,T_M) is an efficiency function of the motor, f ₂(n_E,T_E) is an efficiency function of the engine, n _M is a rotational speed of the motor, T _M is a torque of the motor, n _E is a rotational speed of the engine, T _E is a torque of the engine, η _e ff is a torque utilization rate of the engine, and the efficiency range is [0, 100% ]; determining algorithm parameters, wherein the algorithm parameters at least comprise: particle number, learning factor, inertial weight, maximum acceleration, number of iterations, initial position and velocity of particles; and inputting the target power, the first rotation speed range, the motor operating mode MAP table and the engine universal characteristic curve as input values into an optimizing algorithm according to the optimizing target function, the efficiency range and the algorithm parameters, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque.

Optionally, inputting the target power, the first rotation speed range, the motor condition MAP table, and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque, including: determining a plurality of preliminary operating points according to the target power, the first rotational speed range, the motor operating MAP table and the universal characteristic curve of the engine, wherein the power of the vehicle when running at each preliminary operating point is the target power, one preliminary operating point corresponds to one preliminary rotational speed and one preliminary torque, and each preliminary rotational speed is in the first rotational speed range; respectively determining the working efficiency corresponding to each preparation working point to obtain a plurality of working efficiencies, wherein the working efficiency of the preparation working point is related to the efficiency of the motor corresponding to the preparation working point and the efficiency of the engine; comparing the working efficiency, and determining the working efficiency with the highest value as the highest efficiency of the range extender system after the torque limiting fault occurs; and determining the preliminary operating point corresponding to the highest efficiency as a target operating point, and determining the preliminary rotational speed and the preliminary torque corresponding to the target operating point as the target rotational speed and the target torque.

Optionally, after obtaining the target power of the vehicle, the method further includes: and decreasing a power value of the target power until a maximum number of decreases is reached or the target rotational speed corresponding to the target power is present in the first rotational speed range, when the target rotational speed corresponding to the target power is not present in the first rotational speed range.

Optionally, after determining whether the vehicle has a torque limiter fault, the method further includes: under the condition that the vehicle does not have the torque limiting fault, acquiring the target power and the actual power of the vehicle at the current moment; when the actual power is smaller than the target power, increasing the torque of the engine so that the actual power is equal to the target power; reducing the torque of the engine so that the actual power is equal to the target power when the actual power is greater than the target power; and under the condition that the actual power is equal to the target power, keeping the torque of the engine unchanged at the current moment.

The embodiment of the invention provides a processor, which is used for running a program, wherein the control method of the vehicle range extender system is executed when the program runs.

Specifically, the control method of the vehicle range extender system includes:

step S101, judging whether the vehicle has a torque limiting fault or not;

Optionally, inputting the target power, the first rotation speed range, the motor condition MAP table, and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque, including: determining an optimizing objective function η _Tmax＝f₁(n_M,T_M)×f₂(n_E,η_eff×T_E) and an efficiency range, wherein η ^T _max is a target maximum efficiency, the target maximum efficiency is a maximum efficiency of the range extender system after the torque limiting fault occurs, f ₁(n_M,T_M) is an efficiency function of the motor, f ₂(n_E,T_E) is an efficiency function of the engine, n _M is a rotational speed of the motor, T _M is a torque of the motor, n _E is a rotational speed of the engine, T _E is a torque of the engine, η _e ^ff is a torque utilization rate of the engine, and the efficiency range is [0, 100% ]; determining algorithm parameters, wherein the algorithm parameters at least comprise: particle number, learning factor, inertial weight, maximum acceleration, number of iterations, initial position and velocity of particles; and inputting the target power, the first rotation speed range, the motor operating mode MAP table and the engine universal characteristic curve as input values into an optimizing algorithm according to the optimizing target function, the efficiency range and the algorithm parameters, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque.

The embodiment of the invention provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:

step S101, judging whether the vehicle has a torque limiting fault or not;

The device herein may be a server, PC, PAD, cell phone, etc.

Optionally, inputting the target power, the first rotation speed range, the motor condition MAP table, and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque, including: determining an optimizing objective function η _Tmax＝f₁(n_M,T_M)×f₂(n_E,η_eff×T_E) and an efficiency range, wherein η ^T _max is a target maximum efficiency, the target maximum efficiency is a maximum efficiency of the range extender system after the torque limiting fault occurs, f ₁(n_M,T_M) is an efficiency function of the motor, f ₂(n_E,T_E) is an efficiency function of the engine, n _M is a rotational speed of the motor, T _M is a torque of the motor, n _E is a rotational speed of the engine, T _E is a torque of the engine, η _eff is a torque utilization rate of the engine, and the efficiency range is [0, 100% ]; determining algorithm parameters, wherein the algorithm parameters at least comprise: particle number, learning factor, inertial weight, maximum acceleration, number of iterations, initial position and velocity of particles; and inputting the target power, the first rotation speed range, the motor operating mode MAP table and the engine universal characteristic curve as input values into an optimizing algorithm according to the optimizing target function, the efficiency range and the algorithm parameters, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque.

The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with at least the following method steps:

step S101, judging whether the vehicle has a torque limiting fault or not;

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. 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 processor, 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 means 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.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, 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 storage media for a computer 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 Discs (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. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

1) According to the control method of the vehicle range extender system, the vehicle range extender system comprises an engine of a vehicle and a motor of the vehicle, and whether the vehicle has a torque limiting fault or not is judged; then, when the torque limiter fault occurs in the vehicle, determining a first rotation speed range, wherein the first rotation speed range is a maximum rotation speed range of the engine and the motor after the torque limiter fault occurs in the vehicle, and the rotation speed of the engine is always the same as the rotation speed of the motor; then, obtaining the target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment; when there is a target rotational speed corresponding to the target power in the first rotational speed range, determining the target rotational speed from the first rotational speed range based on at least the target power, and determining a target torque, wherein the target rotational speed and the target torque are a rotational speed and a torque corresponding to a case where the range extender system operates at the target power with the highest efficiency after the torque limiting failure occurs, respectively; finally, the rotational speed of the engine and the rotational speed of the motor are adjusted to the target rotational speed, and the torque of the engine and the torque of the motor are adjusted to the target torque. According to the method, through characteristic analysis of the range extender system, an efficiency optimal working point in a usable working area of the system is found, the high-efficiency operation of the system is ensured while the power requirement is met, and the problem that the high-power requirement of the vehicle cannot be met due to the fact that the output power of the range extender is limited after the vehicle has a torsion limiting fault in the prior art is solved.

2) The control device of the vehicle range extender system comprises a vehicle engine and a vehicle motor, wherein the device comprises a judging unit, a first determining unit, an acquiring unit, a second determining unit and an adjusting unit, and the judging unit is used for judging whether the vehicle has a torque limiting fault or not; a first determining unit configured to determine a first rotation speed range when the torque limiter failure occurs in the vehicle, the first rotation speed range being a maximum rotation speed range between the engine and the motor after the torque limiter failure occurs in the vehicle, the rotation speed of the engine being the same as the rotation speed of the motor; the acquisition unit is used for acquiring the target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment; the second determining unit is configured to determine, when there is a target rotational speed corresponding to the target power in the first rotational speed range, the target rotational speed from the first rotational speed range according to at least the target power, and determine a target torque, where the target rotational speed and the target torque are respectively a rotational speed and a torque corresponding to when the range extender system operates at the target power with the highest efficiency after the torque limiting failure occurs; the adjusting unit is used for adjusting the rotation speed of the engine and the rotation speed of the motor to the target rotation speed, and adjusting the torque of the engine and the torque of the motor to the target torque. The device is through the characteristic analysis to the journey ware system, seeks the efficiency optimum operating point in the available work district of system, when satisfying the power demand, guarantees the high-efficient operation of system, solves among the prior art when the vehicle takes place to limit and turns round the problem that the output of journey ware receives the restriction and leads to unable high-power demand that satisfies the vehicle behind the trouble.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A control method of a vehicle range extender system, characterized in that the vehicle range extender system includes an engine of a vehicle and an electric motor of the vehicle, the method comprising:

Judging whether the vehicle has a torque limiting fault or not;

Determining a first rotation speed range under the condition that the torque limiting fault occurs in the vehicle, wherein the first rotation speed range is the maximum rotation speed range of the engine and the motor after the torque limiting fault occurs in the vehicle, and the rotation speed of the engine is always the same as the rotation speed of the motor;

Acquiring target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment;

Determining a target rotating speed from the first rotating speed range according to at least the target power under the condition that the target rotating speed corresponding to the target power exists in the first rotating speed range, and determining a target torque, wherein the target rotating speed and the target torque are respectively corresponding rotating speeds and torques when the range extender system operates according to the target power with the highest efficiency after the torque limiting fault occurs;

The rotational speed of the engine and the rotational speed of the motor are adjusted to the target rotational speed, and the torque of the engine and the torque of the motor are adjusted to the target torque.

2. The control method according to claim 1, characterized in that determining the target rotational speed from the first rotational speed range and determining a target torque based at least on the target power, comprises:

acquiring the environmental temperature in the environment where the range extender system is located at the current moment;

determining a motor operating condition MAP corresponding to the ambient temperature, the motor operating condition MAP representing a mapping relationship between a rotational speed of the motor, a torque of the motor, and an efficiency of the motor, and an engine universal characteristic representing a mapping relationship between a rotational speed of the engine, a torque of the engine, and an efficiency of the engine;

And inputting the target power, the first rotation speed range, the motor working condition MAP table and the universal characteristic curve of the engine as input values into an optimizing algorithm, and obtaining the output of the optimizing algorithm as the target rotation speed and the target torque.

3. The control method according to claim 2, wherein the optimizing algorithm is one of: genetic algorithm, simulated annealing algorithm, swarm intelligence algorithm, and particle swarm algorithm.

4. The control method according to claim 2, characterized in that inputting the target power, the first rotation speed range, the motor operating MAP table, and the engine universal characteristic as input values into an optimizing algorithm, the output of the optimizing algorithm being the target rotation speed and the target torque, comprising:

Determining an optimizing objective function eta _Tmax＝f₁(n_M,η_eff×T_E)×f₂(n_E,T_E) and an efficiency range, wherein eta _Tmax is a target maximum efficiency, the target maximum efficiency is the highest efficiency of the range extender system after the torque limiting fault occurs, f ₁(n_M,T_M) is an efficiency function of the motor, f ₂(n_E,T_E) is an efficiency function of the engine, n _M is the rotating speed of the motor, T _M is the torque of the motor, n _E is the rotating speed of the engine, T _E is the torque of the engine, eta _eff is the torque utilization rate of the engine, T _M＝η_eff×T_E, and the efficiency range is [0, 100% ];

Determining algorithm parameters, wherein the algorithm parameters at least comprise: particle number, learning factor, inertial weight, maximum acceleration, number of iterations, initial position and velocity of particles;

And according to the optimizing target function, the efficiency range and the algorithm parameters, the target power, the first rotation speed range, the motor working condition MAP table and the universal characteristic curve of the engine are used as input values to an optimizing algorithm, and the output of the optimizing algorithm is obtained to be the target rotation speed and the target torque.

5. The control method according to claim 2, characterized in that inputting the target power, the first rotation speed range, the motor operating MAP table, and the engine universal characteristic as input values into an optimizing algorithm, the output of the optimizing algorithm being the target rotation speed and the target torque, comprising:

Determining a plurality of preparation working points according to the target power, the first rotation speed range, the motor working condition MAP table and the universal characteristic curve of the engine, wherein the power of the vehicle when running at each preparation working point is the target power, one preparation working point corresponds to one preparation rotation speed and one preparation torque, and each preparation rotation speed is in the first rotation speed range;

respectively determining the working efficiency corresponding to each preparation working point to obtain a plurality of working efficiencies, wherein the working efficiency of the preparation working point is related to the efficiency of the motor and the efficiency of the engine corresponding to the preparation working point;

Comparing the working efficiency, and determining the working efficiency with the highest value as the highest efficiency of the range extender system after the torque limiting fault occurs;

And determining the preparation working point corresponding to the highest efficiency as a target working point, and determining the preparation rotating speed and the preparation torque corresponding to the target working point as the target rotating speed and the target torque.

6. The control method according to any one of claims 1 to 5, characterized in that after obtaining the target power of the vehicle, the method further comprises:

And reducing the power value of the target power until the maximum reduction number is reached or the target rotating speed corresponding to the target power exists in the first rotating speed range under the condition that the target rotating speed corresponding to the target power does not exist in the first rotating speed range.

7. The control method according to any one of claims 1 to 5, characterized in that after determining whether or not the vehicle has a torque limiter failure, the method further comprises:

Under the condition that the vehicle does not have the torque limiting fault, acquiring the target power and the actual power of the vehicle at the current moment;

increasing torque of the engine such that the actual power is equal to the target power, in a case where the actual power is smaller than the target power;

reducing torque of the engine such that the actual power is equal to the target power, in a case where the actual power is greater than the target power;

and under the condition that the actual power is equal to the target power, keeping the torque of the engine at the current moment unchanged.

8. A control device of a range extender system for a vehicle, the vehicle range extender system comprising an engine of the vehicle and an electric motor of the vehicle, the device comprising:

The judging unit is used for judging whether the vehicle has a torque limiting fault or not;

A first determining unit, configured to determine a first rotation speed range when the torque limiting fault occurs in the vehicle, where the first rotation speed range is a maximum rotation speed range of the engine and the motor after the torque limiting fault occurs in the vehicle, and the rotation speed of the engine is always the same as the rotation speed of the motor;

The acquisition unit is used for acquiring the target power of the vehicle, wherein the target power is the required power of the vehicle at the current moment;

A second determining unit, configured to determine, in a case where a target rotational speed corresponding to the target power exists in the first rotational speed range, the target rotational speed from the first rotational speed range according to at least the target power, and determine a target torque, where the target rotational speed and the target torque are respectively a rotational speed and a torque corresponding to when the range extender system operates with the highest efficiency according to the target power after the torque limiting failure occurs;

an adjusting unit that adjusts a rotation speed of the engine and a rotation speed of the motor to the target rotation speed, and adjusts a torque of the engine and a torque of the motor to the target torque.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute the control method of the vehicle range extender system according to any one of claims 1 to 7.

10. An electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising a control method for executing the vehicle range extender system of any one of claims 1 to 7.