CN115959148A

CN115959148A - Vehicle control method, vehicle control device and vehicle system

Info

Publication number: CN115959148A
Application number: CN202310088610.0A
Authority: CN
Inventors: 孙晓鹏; 李淑珍; 刘中秀
Original assignee: Weichai Power Co Ltd; Weifang Weichai Power Technology Co Ltd
Current assignee: Weichai Power Co Ltd; Weifang Weichai Power Technology Co Ltd
Priority date: 2023-02-02
Filing date: 2023-02-02
Publication date: 2023-04-14

Abstract

The application provides a control method of a vehicle, a control device of the vehicle and a vehicle system, wherein the method comprises the following steps: establishing an optimization function according to a first model and a second model, wherein the first model is a model which is established according to the speed of a vehicle, the required rotating speed of an engine and the load of the engine and used for calculating the consumption rate of the engine, the second model is a model which is established according to the transmission efficiency of a gearbox, the optimization target is the ratio of the consumption rate to the transmission efficiency, and the variable comprises the required rotating speed; under the condition that the target vehicle is in a steady-state working condition, optimizing the optimization function according to the actual transmission efficiency of the target gearbox, the actual vehicle speed value of the target vehicle and the actual load value of the target engine to obtain the current optimal value of the target vehicle, wherein the current optimal value is the minimum corresponding required rotating speed value of the optimization target determined by current optimization; and determining a target required rotating speed value at least according to the current optimal value, and adjusting the current required rotating speed value of the target vehicle to the target required rotating speed value.

Description

Vehicle control method, vehicle control device and vehicle system

Technical Field

The present disclosure relates to the field of vehicle control technologies, and in particular, to a vehicle control method, a vehicle control device, and a vehicle system.

Background

The universal characteristic of the engine refers to a relation curve of the rotating speed, the torque and the fuel consumption rate of the engine, and two variables are known, and the other variable can be determined. In the prior art, the required rotating speed of the vehicle engine is regulated and controlled only according to the thermal efficiency and universal characteristics of the engine, the consideration factor is not comprehensive enough, and the fuel consumption control effect of the whole vehicle is poor.

Disclosure of Invention

The main purpose of the present application is to provide a control method for a vehicle, a control device for a vehicle, and a vehicle system, so as to at least solve the problem in the prior art that the effect of reducing the overall fuel consumption of the vehicle is poor by a method for regulating and controlling the required rotation speed of an engine.

In order to achieve the above object, according to one aspect of the present application, there is provided a control method of a vehicle, including: establishing an optimization function according to a first model and a second model, wherein the first model is a model which is established according to the speed of a vehicle, the required rotating speed of an engine of the vehicle and the load of the engine and is used for calculating the consumption rate of the engine, the second model is a model which is used for calculating the transmission efficiency of a gearbox of the vehicle, the optimization target of the optimization function is the ratio of the consumption rate to the transmission efficiency, and the variable of the optimization function comprises the required rotating speed; optimizing, namely optimizing the optimization function according to the actual transmission efficiency of a target gearbox, the actual speed value of the target vehicle and the actual load value of a target engine under the condition that the target vehicle is in a steady-state working condition to obtain the current optimal value of the target vehicle, wherein the target engine and the target gearbox are respectively the engine and the gearbox of the target vehicle, and the current optimal value is the minimum corresponding required rotating speed value of the optimization target determined by current optimization; a first determination step of determining a target required rotation speed value at least according to the current optimal value, and adjusting the current required rotation speed value of the target vehicle to the target required rotation speed value.

Optionally, optimizing the optimization function according to the actual transmission efficiency of the target gearbox, the actual vehicle speed value of the target vehicle, and the actual load value of the target engine to obtain the current optimal value of the target vehicle, including: an obtaining substep, obtaining a first optimization time; an adjustment substep, setting the current required rotating speed value to be increased or decreased by a preset step length from the current required rotating speed value to obtain an adjusted rotating speed value; a calculating sub-step, calculating the value of the optimization target according to the optimization function, the adjusted rotating speed value, the actual transmission efficiency, the actual vehicle speed value and the actual load value, and increasing the first optimization times by a first preset value to obtain new first optimization times; a loop sub-step of looping the adjusting sub-step and the calculating sub-step at least once until at least one of first conditions is satisfied, and in a case that at least one of the first conditions is satisfied, determining that the adjusted rotation speed value corresponding to the minimum one of the values of the plurality of optimization objectives is the current optimal value, the first conditions including: the adjusted rotating speed value is larger than the maximum value of the current required rotating speed value or smaller than the minimum value of the current required rotating speed value, and the first optimization times are larger than or equal to a second preset value.

Optionally, determining a target required rotation speed value according to at least the current optimal value includes: determining the consumption of the target engine corresponding to the current optimal value as the current consumption; and determining the target required rotating speed value according to the current optimal value, the current consumption, the previous j-time optimal value and the previous j-time consumption, wherein the previous j-time optimal value is the required rotating speed value corresponding to the minimum optimization target determined by j-time optimization before current optimization, the previous j-time consumption is the consumption corresponding to the previous j-time optimal value, j is more than or equal to 1, and j is an integer.

Optionally, determining the target required rotation speed value according to the current optimal value, the current consumption, the optimal value of the previous j times, and the consumption of the previous j times includes: determining the current optimal value as the target required rotating speed value under the condition that the current consumption is smaller than the previous consumption for j times; and in the case that the current consumption is greater than or equal to one of the previous j consumptions, determining that a target consumption is the minimum value of the previous j consumptions, and the optimal value of the previous j optimal values is the target required rotating speed value.

Optionally, after the first determining step, the method further comprises: an adjusting step, namely increasing a preset second optimization frequency by a third preset value to obtain a new second optimization frequency; a second determination step of determining whether or not the current required rotation speed value satisfies at least one of second conditions including: the current required rotating speed value is larger than the maximum value of the current required rotating speed value or smaller than the minimum value of the current required rotating speed value, and the second optimization time is larger than or equal to a fourth preset value; a loop step of looping the optimizing step, the first determining step, the adjusting step, and the second determining step at least once in a case where the current required rotational speed value does not satisfy at least one of the second conditions until the current required rotational speed value satisfies at least one of the second conditions.

Optionally, before optimizing the optimization function according to the actual transmission efficiency of the target gearbox, the actual vehicle speed value of the target vehicle and the actual load value of the target engine, the method further comprises: and under the condition that the actual rotating speed value of the target vehicle meets the required rotating speed range and the actual vehicle speed value meets the required vehicle speed range, determining that the target vehicle is in the steady-state working condition.

Optionally, before the optimization function is established according to the first model and the second model, the method further includes: determining the net torque of the engine according to the speed of the vehicle and the load of the engine, and establishing a corresponding relation among the net torque, the required rotating speed and the consumption rate to obtain a first model; and determining the transmission pressure of a transmission structure of the gearbox according to the pump group swing angle of the gearbox, establishing a corresponding relation between the transmission pressure and the transmission efficiency, and obtaining the second model, wherein the transmission structure comprises the pump group and a motor.

Optionally, the gearbox is a mechanical hydraulic stepless gearbox, and the transmission efficiency is hydraulic efficiency.

According to another aspect of the present application, there is provided a control apparatus of a vehicle, including: an establishing unit configured to establish an optimization function based on a first model and a second model, wherein the first model is a model that calculates a consumption rate of an engine of a vehicle based on a vehicle speed of the vehicle, a required rotation speed of the engine of the vehicle, and a load of the engine, the second model is a model that calculates a transmission efficiency of a transmission of the vehicle, an optimization target of the optimization function is a ratio of the consumption rate to the transmission efficiency, and a variable of the optimization function includes the required rotation speed; the optimizing unit is used for optimizing the optimizing function according to the actual transmission efficiency of a target gearbox, the actual speed value of the target vehicle and the actual load value of a target engine under the condition that the target vehicle is in a steady-state working condition to obtain the current optimal value of the target vehicle, wherein the target engine and the target gearbox are respectively the engine and the gearbox of the target vehicle, and the current optimal value is the minimum corresponding required rotating speed value of the optimized target determined by current optimizing; and a first determining unit configured to determine a target required rotation speed value based on at least the current optimum value and adjust the current required rotation speed value of the target vehicle to the target required rotation speed value in the first determining step.

According to another aspect of the present application, there is also provided a vehicle system including: a target vehicle: a controller of the target vehicle comprising one or more processors, 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 instructions for performing any of the methods.

According to the technical scheme, firstly, an optimization function with an optimization target of the ratio of consumption rate to transmission efficiency is established according to a first model for calculating the consumption rate of an engine of a vehicle and a second model for calculating the transmission efficiency of a gearbox of the vehicle, wherein the first model is established according to the vehicle speed, the required rotating speed of the engine and the load, and variables of the optimization function comprise the required rotating speed; then, under the condition that the target vehicle runs in a steady-state working condition, optimizing the optimization function according to the actual transmission efficiency, the actual vehicle speed value and the actual load value corresponding to the target vehicle, determining the required rotating speed value of the target vehicle when the current optimization target is minimum, and obtaining a current optimal value; and finally, determining a target required rotating speed value at least according to the current optimal value, and adjusting the current required rotating speed value of the target vehicle to the target required rotating speed value, thereby realizing the dynamic regulation and control of the required rotating speed value of the target vehicle. The method comprehensively considers the influence of the transmission efficiency of a vehicle gearbox and the universal characteristics of an engine on the vehicle oil consumption, establishes an optimization function with the optimization target of the minimum ratio of the consumption rate to the transmission efficiency, carries out transient optimization based on an optimization method under the condition that the whole vehicle runs stably to obtain the optimal engine rotating speed, and adjusts the current required rotating speed value of the vehicle according to the engine rotating speed, so that the consumption rate of the vehicle is low, the transmission efficiency is high, the problem that the effect of reducing the whole vehicle oil consumption by a regulation and control method of the engine required rotating speed in the prior art is poor is solved, the whole vehicle oil consumption can be reduced, and the whole vehicle oil consumption economy is comprehensively improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments and illustrations of the application are intended to explain the application and are not intended to limit the application. In the drawings:

fig. 1 illustrates a hardware configuration block diagram of a mobile terminal that performs a control method of a vehicle according to an embodiment of the present application;

FIG. 2 illustrates a flow chart diagram of a control method of a vehicle provided in accordance with an embodiment of the present application;

FIG. 3 illustrates a schematic representation of a universal characteristic of an engine provided in accordance with an embodiment of the present application;

FIG. 4 illustrates a flow chart diagram of another method of controlling a vehicle provided in accordance with an embodiment of the present application;

FIG. 5 illustrates a control flow diagram for a vehicle provided in accordance with an embodiment of the present application;

fig. 6 shows a block diagram of a control apparatus of a vehicle according to an embodiment of the present application.

Wherein the figures include the following reference numerals:

102. a processor; 104. a memory; 106. a transmission device; 108. and an input/output device.

Detailed Description

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

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

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Moreover, 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 introduced in the background art, in the prior art, a method for regulating and controlling a required rotation speed of an engine has a poor effect of reducing the overall fuel consumption of a vehicle, and to solve the above problems, embodiments of the present application provide a method for controlling a vehicle, a device for controlling a vehicle, and a vehicle system.

The technical solution 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.

The method embodiments provided in the embodiments of the present application may be executed in a mobile terminal, a computer terminal, or a similar computing device. Taking the mobile terminal as an example, fig. 1 is a hardware structure block diagram of the mobile terminal of a control method of a vehicle according to an embodiment of the present invention. As shown in fig. 1, the mobile terminal may include one or more (only one shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), and a memory 104 for storing data, wherein the mobile terminal may further include a transmission device 106 for communication functions and an input-output device 108. It will be understood by those skilled in the art that the structure shown in fig. 1 is only an illustration, and does not limit the structure of the mobile terminal. For example, the mobile terminal may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.

The memory 104 may be used to store computer programs, for example, software programs and modules of application software, such as a computer program corresponding to the method for displaying the device information in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer programs stored in the memory 104, so as to implement the method. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the mobile terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. The specific example of the network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a Network adapter (NIC) that can be connected to other Network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used to communicate with the internet in a wireless manner.

In the present embodiment, a control method for a vehicle running on a mobile terminal, a computer terminal or a similar computing device is provided, it is noted that the steps shown in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and that while a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown or described herein.

Fig. 2 is a flowchart of a control method of a vehicle according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:

step S201, establishing an optimization function according to a first model and a second model, wherein the first model is a model which is established according to the speed of a vehicle, the required rotating speed of an engine of the vehicle and the load of the engine and is used for calculating the consumption rate of the engine, the second model is a model which is used for calculating the transmission efficiency of a gearbox of the vehicle, the optimization target of the optimization function is the ratio of the consumption rate to the transmission efficiency, and the variable of the optimization function comprises the required rotating speed;

the vehicle comprises an engine and a gearbox, wherein the gearbox is a mechanical hydraulic stepless gearbox; the vehicle speed, the required rotational speed, the vehicle speed of the engine, the consumption rate, and the transmission efficiency are all operating parameters of the vehicle. The vehicle speed of the vehicle is the actual vehicle speed of the vehicle; the required rotating speed is the preset rotating speed of the vehicle engine, and the actual rotating speed of the vehicle engine is controlled to run along with the required rotating speed in the running process of the vehicle, namely the actual rotating speed is controlled to gradually reach the required rotating speed and fluctuates in a required rotating speed range determined according to the required rotating speed; the speed of the engine is the load factor of the engine, and the relative concept of the torque percentage of the engine at a specific rotating speed is represented, namely the ratio of the torque emitted by the engine under a partial throttle valve at a certain rotating speed to the maximum torque emitted by the engine when the throttle valve is fully opened; the consumption rate is the fuel consumption rate of the automobile, namely the consumed oil amount per kilowatt hour, and the index is an important index for measuring the fuel economy of the engine. The transmission efficiency is the hydraulic efficiency of the mechanical hydraulic stepless gearbox.

In an embodiment of the present application, the optimization function includes a value range of the required rotation speed, the optimization objective, and an extremum of the optimization objective, and specifically, the optimization function is

Wherein X is the required rotation speed, [ X ] ₁ ，x _n ]Is the value range, x ₁ Is the minimum value of the value range, x _n Is the maximum value of the value range, f (X) is the optimization objective, also called objective function, B _e For the consumption rate, η is the transmission efficiency, and minf (X) represents the minimum value of the optimization objective.

Step S202, an optimization step, namely, under the condition that a target vehicle is in a steady-state working condition, optimizing the optimization function according to the actual transmission efficiency of a target gearbox, the actual vehicle speed value of the target vehicle and the actual load value of a target engine to obtain the current optimal value of the target vehicle, wherein the target engine and the target gearbox are respectively the engine and the gearbox of the target vehicle, and the current optimal value is the minimum corresponding required rotating speed value of the optimization target determined by current optimization;

specifically, the target vehicle is a vehicle that needs to be controlled. The actual transmission efficiency, the actual vehicle speed value, the actual load value and the current optimal value are all the specific values of the operating parameters of the target vehicle. And the current optimal value is the corresponding required rotating speed value when the ratio of the actual consumption rate and the actual transmission efficiency of the target vehicle obtained by the current optimization is minimum.

The optimization process of step S202 is a process of finding a required rotation speed corresponding to the minimum optimization target, that is, the minimum ratio of the actual consumption rate of the target vehicle to the actual transmission efficiency; the steady state operating condition is the operating condition of the target engine at a constant speed, a constant load, a stable temperature and a stable pressure. The consumption rate of the engine is divided by the transmission efficiency to obtain an optimization target, namely the smaller the ratio of the consumption rate of the engine to the transmission efficiency is, the smaller the fuel consumption rate of the engine is, or the higher the transmission efficiency of the gearbox is, namely the smaller the fuel consumption rate of the whole vehicle is, and further the higher the fuel economy of the whole vehicle is.

Step S203, a first determining step of determining a target required rotation speed value at least according to the current optimal value, and adjusting the current required rotation speed value of the target vehicle to the target required rotation speed value.

Specifically, the current required rotation speed value refers to a set current required rotation speed value of the target vehicle, and the current required rotation speed value of the target vehicle is dynamically regulated and controlled through step S201, step S202 and step S203. In step S203, a target required rotation speed value is determined at least according to the current optimal value, for example, the target required rotation speed value is determined as the current optimal value, or the target rotation speed value is determined as a predetermined multiple of the current optimal value, or the target required rotation speed value is determined according to the current optimal value and other parameter values.

According to the embodiment, firstly, an optimization function with an optimization target of the ratio of consumption rate to transmission efficiency is established according to a first model for calculating the consumption rate of an engine of a vehicle and a second model for calculating the transmission efficiency of a gearbox of the vehicle, wherein the first model is established according to the vehicle speed, the required rotating speed of the engine and the load, and variables of the optimization function comprise the required rotating speed; then, under the condition that the target vehicle runs in a steady-state working condition, optimizing the optimization function according to the actual transmission efficiency, the actual vehicle speed value and the actual load value corresponding to the target vehicle, determining the required rotating speed value of the target vehicle when the current optimization target is minimum, and obtaining a current optimal value; and finally, determining a target required rotating speed value at least according to the current optimal value, and adjusting the current required rotating speed value of the target vehicle to the target required rotating speed value, thereby realizing the dynamic regulation and control of the required rotating speed value of the target vehicle. The method comprehensively considers the influence of the transmission efficiency of a vehicle gearbox and the universal characteristics of an engine on the vehicle oil consumption, establishes an optimization function with the optimization target of the minimum ratio of the consumption rate to the transmission efficiency, carries out transient optimization based on an optimization method under the condition that the whole vehicle runs stably to obtain the optimal engine rotating speed, and adjusts the current required rotating speed value of the vehicle according to the engine rotating speed, so that the consumption rate of the vehicle is low, the transmission efficiency is high, the problem that the effect of reducing the whole vehicle oil consumption by a regulation and control method of the engine required rotating speed in the prior art is poor is solved, the whole vehicle oil consumption can be reduced, and the whole vehicle oil consumption economy is comprehensively improved.

Specifically, the limiting condition of the optimization target may include that the actual vehicle speed value of the target vehicle is not changed, that is, the optimization process is a process of performing transient optimization with a minimum ratio of the fuel consumption rate of the target vehicle to the transmission efficiency of the target transmission as an objective function under the condition that the vehicle speed of the target vehicle is ensured to be not changed.

In practical applications, the transmission of a vehicle comprises a transmission structure including a pump stack and a motor, and in an exemplary embodiment of the present application, before establishing the optimization function according to the first model and the second model, the method further comprises: determining the net torque of the engine according to the speed of the vehicle and the load of the engine, and establishing a corresponding relation among the net torque, the required rotating speed and the consumption rate to obtain the first model; and determining the transmission pressure of a transmission structure of the gearbox according to the pump set swing angle of the gearbox, establishing a corresponding relation between the transmission pressure and the transmission efficiency, and obtaining the second model. In this embodiment, the net torque of the engine is calculated according to the vehicle speed and the load of the engine, then the corresponding relationship among the net torque, the required rotation speed and the consumption rate is established to obtain the first model, that is, the first model includes the corresponding relationship among the net torque, the required rotation speed and the consumption rate, the value of the net torque is obtained through the vehicle speed and the load, and then the consumption rate value corresponding to the net torque and the required rotation speed can be determined from the first model according to the value of the net torque and the required rotation speed, so that the calculation relationship between the required rotation speed and the consumption rate can be established more simply, quickly and accurately to obtain the first model; the transmission pressure of the transmission structure of the gearbox is determined according to the swing angle of the gearbox pump group, the corresponding relation between the transmission pressure and the transmission efficiency is established, and the second model is obtained, namely the second model comprises the corresponding relation between the transmission pressure and the transmission efficiency, the specific numerical value of the transmission pressure is obtained through the swing angle, the transmission efficiency corresponding to the specific numerical value can be determined from the second model, the calculation relation between the swing angle and the transmission efficiency can be determined simply, quickly and accurately, and the second model is obtained.

Specifically, the engine outputs a large portion of the remaining power, in addition to the power (torque) consumed by the accessories, and this portion of the fully output power (torque) is the net torque. Determining the net torque of the engine based on the vehicle speed of the vehicle and the load on the engine may be: calculating power of an engine as a product of the vehicle speed of the vehicle and the vehicle speed of the engine according to the vehicle speed of the vehicle and the load of the engine; and determining the net torque according to the power and a predetermined relation, wherein the predetermined relation represents the corresponding relation between the power and the net torque, and the predetermined relation can be recorded in a table form or a graph format. The specific implementation manner of establishing the corresponding relationship among the net torque, the required rotating speed and the consumption rate to obtain the first model may be: and establishing a corresponding relation among the net torque, the required rotating speed and the consumption rate according to the universal characteristics of the engine to obtain the first model. The universal characteristic is information representing the relationship among the three parameters according to the rotating speed, the torque and the fuel consumption rate of the engine, and can be in a table form or a graph format, namely, a plurality of equal fuel consumption rate curves are drawn on a graph by taking the rotating speed as an abscissa and the torque as an ordinate, so as to obtain a universal characteristic graph of the engine shown in fig. 3.

Specifically, determining the transmission pressure of the transmission structure of the gearbox according to the pump set pivot angle of the gearbox, and establishing a corresponding relationship between the transmission pressure and the transmission efficiency to obtain the second model, specifically including: determining the corresponding pump flow according to the swing angle; converting the pump flow into a valve pressure of a shift operating valve of a transmission; calculating a vehicle gear according to the valve pressure; and calculating the transmission efficiency according to the vehicle gear and the actual vehicle speed of the vehicle.

It should be noted that, when the transmission case is a mechanical hydraulic stepless transmission case, the transmission structure is a hydraulic structure of the mechanical hydraulic stepless transmission case, the hydraulic structure includes a hydraulic pump set and a hydraulic motor, and the pump flow is a hydraulic flow. The power assembly system based on a mechanical hydraulic stepless variable transmission (HMCVT) is widely applied to the agricultural machinery market due to the advantages of high working efficiency, small shift impact and the like, however, the efficiency of the HMCVT hydraulic structure can affect the fuel consumption of the whole vehicle operation, the existing HMCVT tractor fuel consumption reduction technology only considers the thermal efficiency and the universal characteristics of an engine, does not consider the transmission efficiency of the hydraulic stepless transmission, cannot comprehensively improve the fuel consumption economy of the whole vehicle, is complex in design, and is not suitable for the HMCVT power assembly system. The method and the device consider the universal characteristics of the engine and the transmission efficiency of the mechanical hydraulic stepless gearbox at the same time, and optimize the optimal engine rotating speed and gearbox transmission ratio under the condition of unchanged vehicle speed, so that the fuel economy of the whole vehicle operation can be greatly improved, and the whole vehicle operation cost is reduced.

The method and the device simultaneously consider the universal characteristics of the engine and the transmission efficiency of the hydraulic stepless gearbox, take the minimum ratio of the fuel consumption rate to the gearbox efficiency as a target function under the condition of ensuring that the vehicle speed is unchanged, carry out transient optimization based on an optimization method, obtain the optimal engine rotating speed and gearbox transmission ratio, realize the cooperative optimization of the engine and the gearbox, and effectively reduce the running fuel consumption of the whole vehicle.

In order to further realize the cooperative optimization of the engine and the gearbox and effectively reduce the fuel consumption of the whole vehicle, in an alternative scheme, the optimization function is optimized according to the actual transmission efficiency of a target gearbox, the actual vehicle speed value of a target vehicle and the actual load value of a target engine to obtain the current optimal value of the target vehicle, as shown in fig. 4, the method comprises the following steps:

step S2021: an obtaining substep, obtaining a first optimization time;

specifically, the first optimization time is a preset initial time, such as equal to 1.

Step S2022: an adjustment substep, setting the current required rotating speed value to be increased or decreased by a preset step length from the current required rotating speed value to obtain an adjusted rotating speed value;

the person skilled in the art can flexibly set the predetermined step size according to actual needs, for example, starting from the current required rotation speed value, increasing 10rpm or decreasing 10rpm to obtain an adjusted rotation speed value. Before the vehicle is controlled, an initial current demanded speed value is set for the vehicle, typically based on the power demand of the engine and the throttle demand. In the subsequent control process, the current required rotating speed value is adjusted in real time.

Step S2023: a calculating substep, calculating a value of the optimization target according to the optimization function, the adjusted rotating speed value, the actual transmission efficiency, the actual vehicle speed value and the actual load value, and increasing the first optimization times by a first preset value to obtain new first optimization times;

and substituting the adjusted rotating speed value, the actual transmission efficiency, the actual vehicle speed value and the actual load value into the optimization function, and calculating a corresponding optimization target. The first predetermined value is also a preset arbitrary value, and is used to calculate the number of optimization times, for example, the first predetermined value may be set to 1, that is, after the optimization target is obtained, a new first optimization time =1+1=2 is calculated.

Step S2024: a loop sub-step of looping the adjusting sub-step and the calculating sub-step at least once until at least one of first conditions is satisfied, and in a case that at least one of the first conditions is satisfied, determining that the adjusted rotation speed value corresponding to the minimum one of the values of the plurality of optimization objectives is the current optimal value, the first conditions including: the adjusted rotating speed value is larger than the maximum value of the current required rotating speed value or smaller than the minimum value of the current required rotating speed value, and the first optimization times are larger than or equal to a second preset value.

The maximum value of the current required rotating speed value and the minimum value of the current required rotating speed value are preset boundary values, and the second preset value is also a preset value and used for limiting the cycle number. In step S2024, when at least one of the first conditions is satisfied, the adjustment substep and the calculation substep are not continuously executed in a loop, but a minimum value is selected from the values of the optimization objectives obtained in the loop, and the required rotation speed value corresponding to the minimum value is the current optimal value determined in the loop.

In the embodiment, the adjustment sub-step and the calculation sub-step are circularly executed according to the current operating condition of the target automobile, so that real-time optimization is realized, the lower fuel consumption rate of the engine corresponding to the optimal engine rotating speed is further ensured to be optimized, and the higher transmission efficiency of the corresponding gearbox is further ensured, thereby further solving the problem that the regulating and controlling method of the engine required rotating speed in the prior art has a poor effect of reducing the overall fuel consumption of the automobile, further ensuring that the specific fuel consumption of the whole automobile is lower, and the fuel consumption of the whole automobile is lower.

In addition, the specific implementation manner of the optimizing step is not limited to the above manner, and optionally, the optimizing function is optimized according to the actual transmission efficiency of the target gearbox, the actual vehicle speed value of the target vehicle, and the actual load value of the target engine, and the obtaining of the current optimal value of the target vehicle may also be implemented by: determining a set of required rotating speed values according to the maximum value of the current required rotating speed value and the minimum value of the current required rotating speed value; determining an optimizing array according to the required rotating speed value set, the actual transmission efficiency, the actual vehicle speed value and the actual load value, wherein the optimizing array comprises a plurality of groups of data, and each group of the plurality of groups of data comprises one numerical value in the required rotating speed value set, the actual transmission efficiency, the actual vehicle speed value and the actual load value; substituting the optimizing arrays into the optimizing function to obtain corresponding values of a plurality of optimizing targets; and determining the numerical value in the set of required rotating speed values corresponding to the minimum one of the values of the optimization targets as the current optimal value.

In order to further ensure that the target required rotating speed value is taken as the current required rotating speed value of the target vehicle, the scheme of regulating and controlling the target engine can significantly reduce the overall fuel consumption of the vehicle, specifically, the step of determining the target required rotating speed value at least according to the current optimal value comprises the following steps: determining the consumption of the target engine corresponding to the current optimal value as the current consumption; and determining the target required rotating speed value according to the current optimal value, the current consumption, the previous j-time optimal value and the previous j-time consumption, wherein the previous j-time optimal value is the required rotating speed value corresponding to the minimum optimization target determined by j-time optimization before current optimization, the previous j-time consumption is the consumption corresponding to the previous j-time optimal value, j is more than or equal to 1, and j is an integer. That is to say, the target required rotating speed value not only needs to consider the current optimizing result, but also needs to consider the optimizing results of previous times, so as to further ensure that the corresponding engine required rotating speed can be more accurately determined when the oil consumption is small under the current vehicle speed, and further realize effective control on the fuel consumption of the target vehicle.

Specifically, the consumption is the fuel consumption of the target engine, namely, how much fuel is consumed per hour, in order to simplify the control process of the vehicle, j may be 1, that is, after each optimization determination of the optimal value, the consumption corresponding to the current optimized value is compared with the consumption corresponding to the optimal value determined last time, and when the consumption corresponding to the current optimized value is greater than the consumption corresponding to the optimal value determined last time, the target required rotation speed value is determined to be the optimal value determined last time; of course, in order to further ensure that the overall fuel consumption is low, j may also take other values, such as 3,5 or 10, and after determining the optimal value corresponding to each optimization, the consumption corresponding to the optimal value currently being optimized is compared with the consumption corresponding to the optimal value determined by the previous 3 times, or the previous 5 times or the previous 10 times of optimization, and the minimum value is selected from the plurality of consumption, and the corresponding optimal value is the target required rotation speed value.

Of course, the manner of determining the target required rotation speed value at least according to the current optimal value is not limited to the manner, and in another alternative embodiment, the determining the target required rotation speed value at least according to the current optimal value includes: and determining the target required rotating speed value as the current optimal value according to the current optimal value.

Further, determining the target required rotating speed value according to the current optimal value, the current consumption, the optimal value of the previous j times and the consumption of the previous j times comprises: determining the current optimal value as the target required rotating speed value under the condition that the current consumption is smaller than the previous j-time consumption; and in the case that the current consumption is greater than or equal to one of the previous j-times consumption, determining that the target consumption is the minimum value of the previous j-times consumption, wherein the optimal value of the previous j-times optimal value is the target required rotating speed value. Through the embodiment, the finally determined target required rotating speed value can be further ensured to be the required rotating speed value with the minimum fuel consumption in the optimal value of the multiple optimizing processes, so that the fuel economy of the whole vehicle is further improved.

Specifically, the consumption may be calculated in a specific manner as follows: multiplying the optimal value by the corresponding net torque to obtain required power; and multiplying the required power and the corresponding consumption rate to obtain the corresponding consumption.

In order to further realize the real-time optimization and real-time regulation of the required rotating speed of the vehicle, in another exemplary embodiment, after the first determining step, the method further comprises:

step S301: adjusting, namely increasing a third preset value to a preset second optimization time to obtain a new second optimization time;

step S302: a second determination step of determining whether or not the current required rotation speed value satisfies at least one of second conditions including: the current demand rotating speed value is larger than the maximum value of the current demand rotating speed value or smaller than the minimum value of the current demand rotating speed value, and the second optimization times are larger than or equal to a fourth preset value;

step S303: a loop step of looping the optimizing step, the first determining step, the adjusting step, and the second determining step at least once in a case where the current required rotational speed value does not satisfy at least one of the second conditions until the current required rotational speed value satisfies at least one of the second conditions.

In the embodiment, after the current required rotating speed value of the target vehicle is adjusted to the target required rotating speed value, the optimization times are updated, and when the optimization times do not meet at least one of the second conditions, the optimizing step, the first determining step, the adjusting step and the second determining step are executed in a circulating manner at least once, so that the intelligent identification of the current working condition of the target vehicle and the real-time optimizing and regulating of the current required vehicle speed are further realized, and the low oil consumption of the target vehicle in the running process is further ensured.

Specifically, the second optimization time is a preset initial time, for example, equal to 1. The third predetermined value is also any preset value for counting the number of optimization times, for example, the third predetermined value may be set to 1, i.e. after the first determination step is performed once, a new second optimization time =1+1=2 is calculated. The maximum value of the current required rotation speed value and the minimum value of the current required rotation speed value are both preset boundary values, and the fourth preset value is also a preset value and used for limiting the cycle number.

According to an alternative aspect of the application, before optimizing the optimization function based on an actual transmission efficiency of a target gearbox, an actual vehicle speed value of the target vehicle and an actual load value of a target engine, the method further comprises: and under the condition that the actual rotating speed value of the target vehicle meets the required rotating speed range and the actual vehicle speed value meets the required vehicle speed range, determining that the target vehicle is in the steady-state working condition. Therefore, the optimal required engine speed is optimized on the premise that the vehicle runs stably and has enough power.

In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the following will describe in detail the implementation process of the control method of the vehicle of the present application with reference to specific embodiments.

The present embodiment relates to a specific control method of a vehicle, as shown in fig. 5, including the steps of:

step S1: when the whole vehicle normally runs, firstly collecting the actual rotating speed, the vehicle speed and other running parameters of an engine, and setting the first optimization times i =1;

step S2: and judging whether the current whole vehicle runs in a stable working condition or not according to the actual rotating speed, the actual vehicle speed, the gear and the like of the current engine. If the actual rotating speed and the actual speed of the engine can well follow the required rotating speed and the required speed of the engine, the situation that the whole vehicle is in stable operation at present is shown, and collaborative optimization control can be carried out; otherwise, the cooperative optimization control cannot be carried out, so that the running stability and dynamic property of the whole vehicle can be ensured.

And step S3: collecting the pressure and the swing angle of a hydraulic structure of the gearbox, and calculating the net torque output by the engine according to the variables such as the actual speed, the load and the like;

and step S4: calculating the fuel consumption rate of the engine at the moment according to the required rotating speed and the net torque of the engine and the universal characteristic curve based on the engine; meanwhile, calculating the hydraulic efficiency of the hydraulic structure based on the pressure and the swing angle of the hydraulic structure;

step S5: the fuel consumption rate of the engine is further divided by the hydraulic efficiency of the hydraulic structure to obtain an optimization target, namely the smaller the ratio of the fuel consumption rate of the engine to the hydraulic efficiency of the hydraulic structure is, the smaller the fuel consumption rate of the engine is or the higher the transmission efficiency of the gearbox is, namely the smaller the fuel consumption rate of the whole vehicle is, and further the fuel economy of the whole vehicle is improved;

step S6: calculating the fuel consumption of the finished automobile at the ith time according to the fuel consumption rate of the finished automobile, the required rotating speed of the engine and the net torque of the engine;

step S7: comparing the fuel consumption of the ith whole vehicle with the fuel consumption of the ith-1 whole vehicle, if the fuel consumption of the ith whole vehicle is small, setting the current optimal engine speed as the engine speed optimized for the ith time, and otherwise, setting the current optimal engine speed as the engine speed optimized for the ith-1 time;

step S8: and judging whether the currently set optimal engine speed reaches the upper and lower limits of the engine speed (namely the maximum value and the minimum value of the currently required speed value) and whether the optimization times reach the set optimization times, if the currently set optimal engine speed reaches the upper and lower limits of the engine speed or the optimization times reach the set maximum optimization times, stopping the optimization, and outputting the currently set optimal engine speed. Otherwise, the number of optimization times i is added by 1, the currently set engine speed is adjusted up by 10rpm or adjusted down by 10rpm, and the step S2 is continued to be returned to for a new round of optimization.

The control method of the embodiment can simultaneously give consideration to the universal characteristics of the engine and the transmission efficiency of the mechanical hydraulic gearbox, and the control method is collaborative and optimized, so that the fuel economy of the whole vehicle is effectively improved. And a transient optimization method is adopted based on an optimization theory, real-time judgment is carried out according to the current running working condition of the whole vehicle, and real-time optimization is carried out, so that the optimal engine rotating speed is optimized on the premise of ensuring the running stability and dynamic property of the whole vehicle, the method is suitable for various working conditions such as transition, transportation, farmland and flat ground of a tractor, the applicability is strong, and the fuel consumption of the running of the whole vehicle can be obviously reduced.

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 different than presented herein.

The embodiment of the present application further provides a control device of a vehicle, and it should be noted that the control device of the vehicle according to the embodiment of the present application may be used to execute the control method for the vehicle according to the embodiment of the present application. The device is used for implementing the embodiments and the preferred embodiments, and the description is omitted for the description. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware or a combination of software and hardware is also possible and contemplated.

The following describes a control device for a vehicle according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a control apparatus of a vehicle according to an embodiment of the present application. As shown in fig. 6, the apparatus includes:

a building unit 10 configured to build a first model and a second model, wherein the first model is a model for calculating a consumption rate of an engine of a vehicle, the model is built according to a vehicle speed of the vehicle, a required rotation speed of the engine of the vehicle, and a load of the engine, the second model is a model for calculating a transmission efficiency of a transmission of the vehicle, an optimization target of the optimization function is a ratio of the consumption rate to the transmission efficiency, and a variable of the optimization function includes the required rotation speed;

the vehicle comprises an engine and a gearbox, wherein the gearbox is a mechanical hydraulic stepless gearbox; the vehicle speed, the required rotation speed, the vehicle speed of the engine, the consumption rate and the transmission efficiency of the vehicle are all running parameters of the vehicle. The vehicle speed of the vehicle is the actual vehicle speed of the vehicle; the required rotating speed is a preset rotating speed of the vehicle engine, and in the running process of the vehicle, the actual rotating speed of the vehicle engine is controlled to run along with the required rotating speed, namely the actual rotating speed is controlled to gradually reach the required rotating speed and fluctuates within a required rotating speed range determined according to the required rotating speed; the speed of the engine is the load factor of the engine, and the relative concept of the torque percentage of the engine at a specific rotating speed is represented, namely the ratio of the torque emitted by the engine under a partial throttle valve at a certain rotating speed to the maximum torque emitted by the engine when the throttle valve is fully opened; the consumption rate is the fuel consumption rate of the automobile, namely the consumed oil amount per kilowatt hour, and the index is an important index for measuring the fuel economy of the engine. The transmission efficiency is the hydraulic efficiency of the mechanical hydraulic stepless gearbox.

In an embodiment of the application, the optimization function includes a value range of the required rotation speed, the optimization objective and an extremum of the optimization objective, and specifically, the optimization function is

The optimizing unit 20 is configured to perform optimizing on the optimization function according to an actual transmission efficiency of a target transmission case, an actual vehicle speed value of the target vehicle, and an actual load value of a target engine when the target vehicle is in a steady-state working condition, so as to obtain a current optimal value of the target vehicle, where the target engine and the target transmission case are respectively an engine and a transmission case of the target vehicle, and the current optimal value is a minimum required rotation speed value corresponding to the optimization target determined by the current optimizing;

specifically, the target vehicle is a vehicle that needs to be controlled. The actual transmission efficiency, the actual vehicle speed value, the actual load value and the current optimal value are all the specific values of the operating parameters of the target vehicle. And the current optimal value is the corresponding required rotating speed value when the ratio of the actual consumption rate of the target vehicle to the actual transmission efficiency obtained by the current optimization is minimum.

The optimizing process of the optimizing step is a process of searching for a corresponding required rotation speed when the optimization target is minimum, that is, the ratio of the actual consumption rate of the target vehicle to the actual transmission efficiency is minimum; the steady state operating condition is the operating condition of the target engine at a constant speed, a constant load, a stable temperature and a stable pressure. The consumption rate of the engine is divided by the transmission efficiency to obtain an optimization target, namely the smaller the ratio of the consumption rate of the engine to the transmission efficiency is, the smaller the fuel consumption rate of the engine is or the higher the transmission efficiency of the gearbox is, namely the smaller the fuel consumption rate of the whole vehicle is, and further the fuel economy of the whole vehicle is higher.

A first determining unit 30, configured to perform a first determining step, determine a target required rotation speed value according to at least the current optimal value, and adjust the current required rotation speed value of the target vehicle to the target required rotation speed value.

Specifically, the current required rotating speed value refers to a set current required rotating speed value of the target vehicle, and the current required rotating speed value of the target vehicle is dynamically regulated and controlled through the establishing step, the optimizing step and the first determining step. In the first determining step, the target required rotation speed value is determined at least according to the current optimal value, and may be determined only according to the current optimal value, for example, the target required rotation speed value is determined to be the current optimal value, or the target rotation speed value is determined to be a predetermined multiple of the current optimal value, or the like, and may also be determined according to the current optimal value and other parameter values.

With the embodiment, the optimization target is an optimization function of the ratio of the consumption rate to the transmission efficiency by the establishing unit based on a first model calculating the consumption rate of the engine of the vehicle and a second model calculating the transmission efficiency of the transmission of the vehicle, wherein the first model is established based on the vehicle speed, the required rotation speed of the engine and the load, and the variables of the optimization function include the required rotation speed; optimizing the optimization function according to the actual transmission efficiency, the actual speed value and the actual load value corresponding to the target vehicle under the condition that the target vehicle operates in a steady-state working condition through the optimizing unit, determining the required rotating speed value of the target vehicle when the current optimization target is minimum, and obtaining the current optimal value; and the first determining unit determines a target required rotating speed value at least according to the current optimal value, and adjusts the current required rotating speed value of the target vehicle to the target required rotating speed value, so that the dynamic regulation and control of the required rotating speed value of the target vehicle are realized. The method comprehensively considers the influence of the transmission efficiency of a vehicle gearbox and the universal characteristics of an engine on the vehicle oil consumption, establishes an optimization function with the optimization target of the minimum ratio of the consumption rate to the transmission efficiency, carries out transient optimization based on an optimization method under the condition that the whole vehicle runs stably to obtain the optimal engine rotating speed, and adjusts the current required rotating speed value of the vehicle according to the engine rotating speed, so that the consumption rate of the vehicle is low, the transmission efficiency is high, the problem that the effect of reducing the whole vehicle oil consumption by a regulation and control method of the engine required rotating speed in the prior art is poor is solved, the whole vehicle oil consumption can be reduced, and the whole vehicle oil consumption economy is comprehensively improved.

In practical application, the transmission of a vehicle includes a transmission structure, the transmission structure includes a pump set and a motor, and in an exemplary embodiment of the present application, the apparatus further includes: a second determination unit, configured to determine a net torque of the engine according to a vehicle speed of the vehicle and a load of the engine before establishing an optimization function according to a first model and a second model, and establish a correspondence relationship between the net torque, the required rotation speed, and the consumption rate to obtain the first model; and the third determining unit is used for determining the transmission pressure of the transmission structure of the gearbox according to the pump set swing angle of the gearbox, establishing the corresponding relation between the transmission pressure and the transmission efficiency and obtaining the second model. In this embodiment, the net torque of the engine is calculated according to the vehicle speed and the load of the engine, then the corresponding relationship among the net torque, the required rotation speed and the consumption rate is established, so as to obtain the first model, that is, the first model includes the corresponding relationship among the net torque, the required rotation speed and the consumption rate, the value of the net torque is obtained through the vehicle speed and the load, and then the consumption rate value corresponding to the net torque, the required rotation speed and the required rotation speed can be determined from the first model according to the value of the net torque and the required rotation speed, so that the calculation relationship between the required rotation speed and the consumption rate can be established more simply, quickly and accurately, so as to obtain the first model; the method comprises the steps of determining the transmission pressure of a transmission structure of the gearbox according to the swing angle of a pump group of the gearbox, establishing the corresponding relation between the transmission pressure and the transmission efficiency to obtain a second model, namely, the second model comprises the corresponding relation between the transmission pressure and the transmission efficiency, obtaining a specific numerical value of the transmission pressure through the swing angle, determining the transmission efficiency corresponding to the specific numerical value from the second model, and ensuring that the calculation relation between the swing angle and the transmission efficiency can be determined simply, quickly and accurately to obtain the second model.

Specifically, the engine outputs a large portion of the remaining power, in addition to the power (torque) consumed by the accessories, and this portion of the fully output power (torque) is the net torque. The second determination unit may include: the first calculation module is used for calculating the power of the engine as the product of the vehicle speed of the vehicle and the vehicle speed of the engine according to the vehicle speed of the vehicle and the load of the engine; the first determining module is used for determining the net torque according to the power and a predetermined relation, wherein the predetermined relation represents a corresponding relation between the power and the net torque, and the predetermined relation can be recorded in a table form or a graph format. The second determination unit may further include: and the establishing module is used for establishing a corresponding relation among the net torque, the required rotating speed and the consumption rate according to the universal characteristics of the engine to obtain the first model. The universal characteristics are information representing the relationship among the three parameters according to the rotating speed, the torque and the fuel consumption rate of the engine, and can be in a table form or a graph format, that is, a plurality of equal fuel consumption rate curves are drawn on a graph by taking the rotating speed as an abscissa and taking the torque as an ordinate, so as to obtain a universal characteristic graph of the engine shown in fig. 3.

Specifically, the third determining unit specifically includes: the second determining module is used for determining the corresponding pump flow according to the swing angle; the conversion module is used for converting the pump flow into the valve pressure of a speed change operation valve of the gearbox; the second calculation module is used for calculating the gear of the vehicle according to the valve pressure; and the third calculation module is used for calculating the transmission efficiency according to the vehicle gear and the actual vehicle speed of the vehicle.

It should be noted that, in the case that the transmission case is a mechanical hydraulic stepless transmission case, the transmission structure is a hydraulic structure of the mechanical hydraulic stepless transmission case, the hydraulic structure includes a hydraulic pump group and a hydraulic motor, and the pump flow is hydraulic flow. The power assembly system based on the mechanical hydraulic stepless speed changing box (HMCVT) is widely applied to the agricultural machinery market due to the advantages of high working efficiency, small gear shifting impact and the like, however, the efficiency of the HMCVT hydraulic structure can influence the fuel consumption of the whole vehicle operation, the fuel consumption reduction technology of the existing HMCVT tractor only considers the heat efficiency and the universal characteristics of an engine, the transmission efficiency of the hydraulic stepless speed changing box is not considered, the fuel consumption economy of the whole vehicle can not be comprehensively improved, the design is complex, and the power assembly system is not suitable for the HMCVT power assembly system. The method and the device consider the universal characteristics of the engine and the transmission efficiency of the mechanical hydraulic stepless gearbox at the same time, and optimize the optimal engine rotating speed and gearbox transmission ratio under the condition of unchanged vehicle speed, so that the fuel economy of the whole vehicle operation can be greatly improved, and the whole vehicle operation cost is reduced.

The method and the device simultaneously consider the universal characteristics of the engine and the transmission efficiency of the hydraulic stepless gearbox, carry out transient optimization based on an optimization method by taking the minimum ratio of the fuel consumption rate to the gearbox efficiency as a target function under the condition of ensuring that the vehicle speed is not changed, obtain the optimal engine rotating speed and gearbox transmission ratio, realize the cooperative optimization of the engine and the gearbox, and effectively reduce the fuel consumption of the whole vehicle in operation.

In order to further realize the cooperative optimization of the engine and the gearbox and effectively reduce the fuel consumption of the whole vehicle, in one alternative, the optimizing unit comprises:

the obtaining module is used for obtaining the substep and obtaining the first optimization times;

The adjusting module is used for adjusting the substep, and the adjusting module is used for increasing or decreasing the current required rotating speed value by preset step length from the current required rotating speed value to obtain an adjusted rotating speed value;

the person skilled in the art can flexibly set the predetermined step size according to actual needs, for example, starting from the current demanded rotating speed value, increasing 10rpm or decreasing 10rpm to obtain an adjusted rotating speed value. Before the vehicle is controlled, an initial current demanded speed value is set for the vehicle, typically based on the power demand of the engine and the throttle demand. In the subsequent control process, the current required rotating speed value is adjusted in real time.

A fourth calculating module, configured to calculate a substep, calculate a value of the optimization target according to the optimization function, the adjusted rotation speed value, the actual transmission efficiency, the actual vehicle speed value, and the actual load value, and increase the first optimization frequency by a first predetermined value to obtain a new first optimization frequency;

and substituting the adjusted rotating speed value, the actual transmission efficiency, the actual vehicle speed value and the actual load value into the optimization function, and calculating a corresponding optimization target. The first predetermined value is also a preset arbitrary value, and is used to calculate the optimization times, for example, the first predetermined value may be set to 1, that is, after the optimization target is obtained, a new first optimization time =1+1=2 is calculated.

A loop module configured to loop the substep, wherein the adjusting substep and the calculating substep are performed at least once until at least one of first conditions is satisfied, and in a case that at least one of the first conditions is satisfied, the adjusted rotation speed value corresponding to the minimum one of the optimization target values is determined to be the current optimal value, and the first condition includes: the adjusted rotating speed value is larger than the maximum value of the current required rotating speed value or smaller than the minimum value of the current required rotating speed value, and the first optimization time is larger than or equal to a second preset value.

The maximum value of the current required rotating speed value and the minimum value of the current required rotating speed value are preset boundary values, and the second preset value is also a preset value and used for limiting the cycle number. In the loop substep, when at least one of the first conditions is satisfied, the adjustment substep and the calculation substep are not continuously performed in a loop, but a minimum value is selected from among a plurality of optimization target values obtained in the loop, and the required rotation speed value corresponding to the minimum value is the current optimal value determined in the loop.

In addition, the specific implementation manner of the optimizing step is not limited to the above manner, and optionally, the optimizing unit may further include: the third determining module is used for determining a set of required rotating speed values according to the maximum value of the current required rotating speed value and the minimum value of the current required rotating speed value; a fourth determining module, configured to determine an optimization array according to the set of required rotation speed values, the actual transmission efficiency, the actual vehicle speed value, and the actual load value, where the optimization array includes multiple sets of data, and each set of the multiple sets of data includes one value of the set of required rotation speed values, the actual transmission efficiency, the actual vehicle speed value, and the actual load value; the substituting module is used for substituting the optimizing array into the optimizing function to obtain values of a plurality of corresponding optimizing targets; and the fifth determining module is used for determining that the numerical value in the required rotating speed value set corresponding to the minimum one of the optimization target values is the current optimal value.

In order to further ensure that the target required rotating speed value is taken as the current required rotating speed value of the target vehicle, the scheme of regulating and controlling the target engine can significantly reduce the overall fuel consumption of the vehicle, specifically, the first determining unit includes: the sixth determining module is used for determining the consumption of the target engine corresponding to the current optimal value as the current consumption; a seventh determining module, configured to determine the target required rotation speed value according to the current optimal value, the current consumption, a previous j-th optimal value, and a previous j-th consumption, where the previous j-th optimal value is the required rotation speed value corresponding to the minimum optimization target determined by j-th optimization before current optimization, and the previous j-th consumption is the consumption corresponding to the previous j-th optimal value, where j is greater than or equal to 1 and j is an integer. That is to say, the target required rotating speed value not only needs to consider the current optimizing result, but also needs to consider the optimizing results of previous times, so as to further ensure that the corresponding engine required rotating speed can be more accurately determined when the oil consumption is small under the current vehicle speed, and further realize effective control on the fuel consumption of the target vehicle.

Specifically, the consumption is the fuel consumption of the target engine, that is, how much fuel is consumed per hour, and j may be 1 in order to simplify the control process of the vehicle, that is, after each optimization determination of the optimal value, the consumption corresponding to the current optimized value is compared with the consumption corresponding to the optimal value determined last time, and when the consumption corresponding to the current optimized value is greater than the consumption corresponding to the optimal value determined last time, the target required rotation speed value is determined to be the optimal value determined last time; of course, in order to further ensure that the overall fuel consumption is low, j may also take other values, such as 3,5 or 10, and after determining the optimal value corresponding to each optimization, the consumption corresponding to the optimal value currently being optimized is compared with the consumption corresponding to the optimal value determined by the previous 3 times, or the previous 5 times or the previous 10 times of optimization, and the minimum value is selected from the plurality of consumption, and the corresponding optimal value is the target required rotation speed value.

Of course, the manner of determining the target required rotation speed value at least according to the current optimal value is not limited to the manner, and in still another alternative embodiment, the first determining unit includes: and the eighth determining module is used for determining the target required rotating speed value as the current optimal value according to the current optimal value.

Further, the seventh determining module includes: a first determining submodule, configured to determine that the current optimal value is the target required rotation speed value when the current consumption is smaller than the previous consumption for j times; and a second determining sub-module, configured to determine, when the current consumption is greater than or equal to one of the previous j consumptions, that an optimal value of a target consumption corresponding to the optimal value of the previous j is the target required rotation speed value, and the target consumption is a minimum value of the previous j consumptions. Through the embodiment, the finally determined target required rotating speed value can be further ensured to be the required rotating speed value with the minimum fuel consumption in the optimal value of the multiple optimizing processes, so that the fuel economy of the whole vehicle is further improved.

In order to further realize real-time optimization and real-time regulation of the required rotation speed of the vehicle, in another exemplary embodiment, the apparatus further comprises:

an adjusting unit, configured to increase a preset second optimization time by a third predetermined value in an adjusting step after the first determining step, to obtain a new second optimization time;

a fourth determination unit configured to determine whether or not the current required rotation speed value satisfies at least one of second conditions including: the current required rotating speed value is larger than the maximum value of the current required rotating speed value or smaller than the minimum value of the current required rotating speed value, and the second optimization time is larger than or equal to a fourth preset value;

a circulation unit configured to circulate the optimizing step, the first determining step, the adjusting step, and the second determining step at least once in a case where the current required rotation speed value does not satisfy at least one of the second conditions until the current required rotation speed value satisfies at least one of the second conditions.

In the embodiment, after the current required rotating speed value of the target vehicle is adjusted to the target required rotating speed value, the optimization times are updated, and when the optimization times do not meet at least one of the second conditions, the optimizing step, the first determining step, the adjusting step and the second determining step are executed at least once in a circulating manner, so that the intelligent identification of the current working condition of the target vehicle and the real-time optimizing and regulating of the current required vehicle speed are further realized, and the low fuel consumption of the target vehicle in the running process is further ensured.

Specifically, the second optimization time is a preset initial time, for example, equal to 1. The third predetermined value is also any preset value for counting the number of optimization, for example, the third predetermined value may be set to 1, that is, after the first determination step is performed once, a new second optimization number =1+1=2 is calculated. The maximum value of the current required rotation speed value and the minimum value of the current required rotation speed value are both preset boundary values, and the fourth preset value is also a preset value and used for limiting the cycle number.

According to an optional aspect of the present application, the apparatus further comprises: and a fifth determining unit, configured to determine that the target vehicle is in the steady-state operating condition under a condition that an actual rotation speed value of the target vehicle meets a required rotation speed range and the actual vehicle speed value meets the required vehicle speed range before optimizing the optimization function according to an actual transmission efficiency of a target gearbox, the actual vehicle speed value of the target vehicle, and an actual load value of a target engine. This ensures that the optimum engine speed requirement is optimized on the premise that the vehicle runs stably and has enough power.

The control device of the vehicle includes a processor and a memory, the establishing unit, the optimizing unit, the first determining unit, and the like are stored in the memory as program units, and the program units stored in the memory are executed by the processor to realize corresponding functions. The modules are all located in the same processor; or, the modules are respectively located in different processors in any combination.

The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The number of the inner cores can be one or more, and the problem that the effect of the regulation and control method for the required rotating speed of the engine on the overall oil consumption of the vehicle is poor in the prior art is at least solved by adjusting the inner cores.

The memory may include volatile memory in a computer readable medium, random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

The embodiment of the invention provides a computer-readable storage medium, which comprises a stored program, wherein when the program runs, a device where the computer-readable storage medium is located is controlled to execute a control method of a vehicle.

Specifically, a control method of a vehicle includes:

step S201, establishing an optimization function according to a first model and a second model, wherein the first model is a model which is established according to the speed of a vehicle, the required rotating speed of an engine of the vehicle and the load of the engine and is used for calculating the consumption rate of the engine, the second model is a model which is used for calculating the transmission efficiency of a gearbox of the vehicle, the optimization target of the optimization function is the ratio of the consumption rate to the transmission efficiency, and variables of the optimization function comprise the required rotating speed;

step S202, an optimization step, namely, under the condition that a target vehicle is in a steady-state working condition, optimizing the optimization function according to the actual transmission efficiency of a target gearbox, the actual speed value of the target vehicle and the actual load value of a target engine to obtain the current optimal value of the target vehicle, wherein the target engine and the target gearbox are respectively the engine and the gearbox of the target vehicle, and the current optimal value is the minimum corresponding required rotating speed value of the optimization target determined by current optimization;

The embodiment of the invention provides a processor, which is used for running a program, wherein the program executes a control method of a vehicle when running.

Specifically, a control method of a vehicle includes:

An embodiment of the present invention provides a vehicle system, including: a target vehicle: a controller of the target vehicle comprising one or more processors, 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, which when executing the programs implement at least the following:

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

The present application further provides a computer program product adapted to perform a program of initializing at least the following method steps when executed on a data processing device:

It will be apparent to those skilled in the art that the described modules or steps of the present invention may be implemented in a general purpose computing device, they may be centralized in a single computing device or distributed across a network of multiple computing devices, and they may be implemented in program code that is executable by a computing device, such that they may be stored in a memory device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different from that described herein, or they may be separately fabricated as individual integrated circuit modules, or multiple modules or steps thereof may be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

As will be appreciated by one skilled in the art, 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 so forth) 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The 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 computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

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 a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

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

the method comprehensively considers the influence of the transmission efficiency of a vehicle gearbox and the universal characteristics of an engine on the vehicle oil consumption, establishes an optimization function with the optimization target of the minimum ratio of the consumption rate to the transmission efficiency, carries out transient optimization based on an optimization method under the condition that the whole vehicle runs stably to obtain the optimal engine rotating speed, and adjusts the current required rotating speed value of the vehicle according to the engine rotating speed, so that the consumption rate of the vehicle is low, the transmission efficiency is high, the problem that the effect of reducing the whole vehicle oil consumption by a regulation and control method of the engine required rotating speed in the prior art is poor is solved, the whole vehicle oil consumption can be reduced, and the whole vehicle oil consumption economy is comprehensively improved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method of a vehicle, characterized by comprising:

establishing an optimization function according to a first model and a second model, wherein the first model is a model which is established according to the speed of a vehicle, the required rotating speed of an engine of the vehicle and the load of the engine and is used for calculating the consumption rate of the engine, the second model is a model which is used for calculating the transmission efficiency of a gearbox of the vehicle, the optimization target of the optimization function is the ratio of the consumption rate to the transmission efficiency, and the variable of the optimization function comprises the required rotating speed;

optimizing, namely optimizing the optimization function according to the actual transmission efficiency of a target gearbox, the actual speed value of the target vehicle and the actual load value of a target engine under the condition that the target vehicle is in a steady-state working condition to obtain the current optimal value of the target vehicle, wherein the target engine and the target gearbox are respectively the engine and the gearbox of the target vehicle, and the current optimal value is the minimum corresponding required rotating speed value of the optimization target determined by current optimization;

a first determination step of determining a target required rotation speed value at least according to the current optimal value, and adjusting the current required rotation speed value of the target vehicle to the target required rotation speed value.

2. The method of claim 1, wherein optimizing the optimization function based on the actual transmission efficiency of the target transmission, the actual vehicle speed value of the target vehicle, and the actual load value of the target engine to obtain the current optimal value of the target vehicle comprises:

an obtaining substep, obtaining a first optimization time;

an adjustment substep, setting the current required rotating speed value to be increased or decreased by a preset step length from the current required rotating speed value to obtain an adjusted rotating speed value;

a calculating sub-step, calculating the value of the optimization target according to the optimization function, the adjusted rotating speed value, the actual transmission efficiency, the actual vehicle speed value and the actual load value, and increasing the first optimization times by a first preset value to obtain new first optimization times;

a loop sub-step of looping the adjusting sub-step and the calculating sub-step at least once until at least one of first conditions is satisfied, and in a case that at least one of the first conditions is satisfied, determining that the adjusted rotation speed value corresponding to the minimum one of the values of the plurality of optimization objectives is the current optimal value, the first conditions including: the adjusted rotating speed value is larger than the maximum value of the current required rotating speed value or smaller than the minimum value of the current required rotating speed value, and the first optimization time is larger than or equal to a second preset value.

3. The method of claim 1, wherein determining a target demanded speed value based at least on the current optimal value comprises:

determining the consumption of the target engine corresponding to the current optimal value as the current consumption;

and determining the target required rotating speed value according to the current optimal value, the current consumption, the previous j-time optimal value and the previous j-time consumption, wherein the previous j-time optimal value is the required rotating speed value corresponding to the minimum optimization target determined by j-time optimization before current optimization, the previous j-time consumption is the consumption corresponding to the previous j-time optimal value, j is more than or equal to 1, and j is an integer.

4. The method according to claim 3, wherein determining the target required rotation speed value based on the current optimum value, the current consumption amount, the former j-th optimum value, and the former j-th consumption amount includes:

determining the current optimal value as the target required rotating speed value under the condition that the current consumption is smaller than the previous j-time consumption;

and in the case that the current consumption is greater than or equal to one of the previous j consumptions, determining that a target consumption is the minimum value of the previous j consumptions, and the optimal value of the previous j optimal values is the target required rotating speed value.

5. The method according to any one of claims 1 to 4, characterized in that after the first determining step, the method further comprises:

an adjusting step, namely increasing a preset second optimization frequency by a third preset value to obtain a new second optimization frequency;

a second determination step of determining whether or not the current required rotation speed value satisfies at least one of second conditions including: the current required rotating speed value is larger than the maximum value of the current required rotating speed value or smaller than the minimum value of the current required rotating speed value, and the second optimization time is larger than or equal to a fourth preset value;

a loop step of looping the optimizing step, the first determining step, the adjusting step, and the second determining step at least once in a case where the current required rotational speed value does not satisfy at least one of the second conditions until the current required rotational speed value satisfies at least one of the second conditions.

6. The method according to any one of claims 1 to 4, characterized in that before optimizing the optimization function based on an actual transmission efficiency of a target gearbox, an actual vehicle speed value of the target vehicle and an actual load value of a target engine, the method further comprises:

and under the condition that the actual rotating speed value of the target vehicle meets the required rotating speed range and the actual vehicle speed value meets the required vehicle speed range, determining that the target vehicle is in the steady-state working condition.

7. The method of any of claims 1-4, wherein prior to establishing the optimization function based on the first model and the second model, the method further comprises:

determining the net torque of the engine according to the speed of the vehicle and the load of the engine, and establishing a corresponding relation among the net torque, the required rotating speed and the consumption rate to obtain the first model;

and determining the transmission pressure of a transmission structure of the gearbox according to the pump group swing angle of the gearbox, establishing the corresponding relation between the transmission pressure and the transmission efficiency, and obtaining the second model, wherein the transmission structure comprises the pump group and a motor.

8. The method according to any one of claims 1 to 4, wherein the gearbox is a mechano-hydraulic continuously variable gearbox and the transmission efficiency is a hydraulic efficiency.

9. A control apparatus of a vehicle, characterized by comprising:

an establishing unit configured to establish an optimization function based on a first model and a second model, wherein the first model is a model that calculates a consumption rate of an engine of a vehicle based on a vehicle speed of the vehicle, a required rotation speed of the engine of the vehicle, and a load of the engine, the second model is a model that calculates a transmission efficiency of a transmission of the vehicle, an optimization target of the optimization function is a ratio of the consumption rate to the transmission efficiency, and a variable of the optimization function includes the required rotation speed;

the optimizing unit is used for optimizing the optimizing function according to the actual transmission efficiency of a target gearbox, the actual speed value of the target vehicle and the actual load value of a target engine under the condition that the target vehicle is in a steady-state working condition to obtain the current optimal value of the target vehicle, wherein the target engine and the target gearbox are respectively the engine and the gearbox of the target vehicle, and the current optimal value is the minimum corresponding required rotating speed value of the optimized target determined by current optimizing;

and a first determining unit configured to determine a target required rotation speed value based on at least the current optimum value and adjust the current required rotation speed value of the target vehicle to the target required rotation speed value in the first determining step.

10. A vehicle system, comprising:

a target vehicle:

a controller of the target vehicle comprising one or more processors, 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 instructions for performing the method of any of claims 1-8.