CN109973226B - Torque control method and device of engine - Google Patents

Torque control method and device of engine Download PDF

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Publication number
CN109973226B
CN109973226B CN201910244000.9A CN201910244000A CN109973226B CN 109973226 B CN109973226 B CN 109973226B CN 201910244000 A CN201910244000 A CN 201910244000A CN 109973226 B CN109973226 B CN 109973226B
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torque
value
torque value
engine
group
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CN109973226A (en
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朱江苏
吕文芝
刘刚
尹东东
姚泽光
李建东
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2409—Addressing techniques specially adapted therefor
    • F02D41/2422—Selective use of one or more tables
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0404—Throttle position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0614—Actual fuel mass or fuel injection amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The application provides a torque control method and a torque control device of an engine, wherein the method comprises the following steps: acquiring a torque range corresponding to the value groups, wherein any one value group comprises a rotating speed value and an accelerator opening value which meet the preset corresponding relation of the engine, the corresponding relation is the corresponding relation of the rotating speed, the accelerator opening and the torque of the engine, and the torque range corresponding to the value group comprises at least one torque value; combining torque values that minimize the integrated specific fuel consumption of the engine as a target torque value combination; any one torque value combination is formed by taking a torque value from the torque range corresponding to each numerical value group; and under the condition that any one value group is collected, controlling to output a target torque, wherein the target torque is the torque corresponding to the value group in the target torque combination. Through the torque control scheme provided by the application, the oil consumption of the automobile in the running process can be reduced.

Description

Torque control method and device of engine
Technical Field
The present disclosure relates to the field of engines, and more particularly, to a torque control method and apparatus for an engine.
Background
The engine comprises an Electronic Control Unit (ECU), a sensor and an actuator, and the ECU performs various Control functions.
During the running process of the automobile, an ECU in the electronic control engine determines the torque of the engine according to the current rotating speed of the engine and the opening degree of an accelerator pedal, so that the ECU controls an oil sprayer to spray oil according to the oil spraying quantity corresponding to the torque.
Disclosure of Invention
The application provides a torque control method and device of an engine, and aims to solve the problem of how to reduce oil consumption in the driving process of an automobile.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a torque control method of an engine, comprising the following steps:
acquiring a torque range corresponding to a value group, wherein any value group comprises a rotating speed value and an accelerator opening value which meet the preset corresponding relation of the engine, the corresponding relation is the corresponding relation of the rotating speed, the accelerator opening and the torque of the engine, and the torque range corresponding to the value group comprises at least one torque value;
combining torque values that minimize the integrated specific fuel consumption of the engine as a target torque value combination; any one torque value combination is formed by taking a torque value from the torque range corresponding to each numerical value group;
and under the condition that any value group is collected, controlling to output a target torque, wherein the target torque is the torque corresponding to the value group in the target torque combination.
Optionally, for any torque value combination made up of one torque value from the torque range corresponding to each value set, the integrated specific fuel consumption of the engine corresponding to the torque value combination is: the sum of the specific fuel consumption corresponding to each torque value in the torque value combination;
for any one torque value in the torque value combination, the fuel consumption rate corresponding to the torque value is determined according to the torque value, the value group corresponding to the torque range to which the torque value belongs, and the equal fuel consumption rate curve.
Optionally, for any torque value combination made up of one torque value from the torque range corresponding to each value set, the integrated specific fuel consumption of the engine corresponding to the torque value combination is: the sum of the target specific fuel consumption for each torque value in the combination of torque values;
for any one torque value in the torque value combination, the target fuel consumption rate corresponding to the torque value is as follows: the product of the fuel consumption rate corresponding to the torque value and the target coefficient, wherein the fuel consumption rate corresponding to the torque value is determined according to the torque value, a numerical value group corresponding to the torque range to which the torque value belongs and an equal fuel consumption rate curve; the target coefficient is a numerical value group corresponding to the torque range to which the torque value belongs, and is the probability of occurrence in the actual running process of the automobile.
Optionally, the obtaining of the torque range corresponding to the set of values includes:
acquiring a torque value corresponding to the numerical value group meeting the preset condition; the preset conditions at least comprise the preset corresponding relation;
adding the torque value and a value in a preset step range aiming at the torque value corresponding to any one value group to obtain a torque range corresponding to the torque value;
and taking the torque range corresponding to the torque value as the torque range corresponding to the numerical value group.
Optionally, the preset condition further includes: an outer characteristic of the engine.
The present application also provides a torque control device of an engine, including:
the system comprises an acquisition module, a comparison module and a judgment module, wherein the acquisition module is used for acquiring a torque range corresponding to a numerical value set, any one numerical value set comprises a rotating speed value and an accelerator opening value which meet the preset corresponding relation of the engine, the corresponding relation is the corresponding relation of the rotating speed, the accelerator opening and the torque of the engine, and the torque range corresponding to the numerical value set comprises at least one torque value;
an execution module for combining torque values that minimize a comprehensive fuel consumption rate of the engine as a target torque value combination; any one torque value combination is formed by taking a torque value from the torque range corresponding to each numerical value group;
and the control module is used for controlling and outputting a target torque under the condition of collecting any one value group, wherein the target torque is the torque corresponding to the value group in the target torque combination.
Optionally, for any torque value combination made up of one torque value from the torque range corresponding to each value set, the integrated specific fuel consumption of the engine corresponding to the torque value combination is: the sum of the specific fuel consumption corresponding to each torque value in the torque value combination;
for any one torque value in the torque value combination, the fuel consumption rate corresponding to the torque value is determined according to the torque value, the value group corresponding to the torque range to which the torque value belongs, and the equal fuel consumption rate curve.
Optionally, for any torque value combination made up of one torque value from the torque range corresponding to each value set, the integrated specific fuel consumption of the engine corresponding to the torque value combination is: the sum of the target specific fuel consumption for each torque value in the combination of torque values;
for any one torque value in the torque value combination, the target fuel consumption rate corresponding to the torque value is as follows: the product of the fuel consumption rate corresponding to the torque value and the target coefficient, wherein the fuel consumption rate corresponding to the torque value is determined according to the torque value, a numerical value group corresponding to the torque range to which the torque value belongs and an equal fuel consumption rate curve; the target coefficient is a numerical value group corresponding to the torque range to which the torque value belongs, and is the probability of occurrence in the actual running process of the automobile.
Optionally, the obtaining module is configured to obtain a torque range corresponding to the set of values, and includes:
acquiring a torque value corresponding to the numerical value group meeting the preset condition; the preset conditions at least comprise the preset corresponding relation;
adding the torque value and a value in a preset step range aiming at the torque value corresponding to any one value group to obtain a torque range corresponding to the torque value;
and taking the torque range corresponding to the torque value as the torque range corresponding to the numerical value group.
Optionally, the preset condition further includes: an outer characteristic of the engine.
According to the torque control scheme of the engine, the torque range corresponding to the value groups is obtained, wherein any one of the value groups comprises a rotating speed value and an accelerator opening value which meet the preset corresponding relation among the rotating speed, the accelerator opening and the torque of the engine, the torque range corresponding to the value groups at least comprises one torque value, the torque values which enable the comprehensive fuel consumption rate of the engine to be the lowest are combined to serve as the target torque value combination, and the corresponding relation between the torque value which enables the comprehensive consumption rate of the engine to be the lowest and the value groups is obtained.
Therefore, under the condition that any one value group in the driving process of the automobile is collected, the torque value corresponding to the value group in the corresponding relation is controlled and output to be the target torque, the comprehensive fuel consumption rate of the engine can be minimized due to the corresponding relation formed by the engine rotating speed, the accelerator opening and the torque obtained in the torque control scheme of the engine provided by the application, and each value group appearing in the driving process of the automobile is the target torque determined according to the corresponding relation, so that the sum of the fuel injection amount of each value group determined in the driving process of the automobile is reduced compared with the prior art, namely the fuel consumption in the driving process of the automobile can be reduced by adopting the torque control scheme of the engine provided by the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a throttle MAP and a universal characteristic curve disclosed in an embodiment of the present application;
FIG. 2 is a flowchart of a method for optimizing the throttle MAP according to an embodiment of the present disclosure;
FIG. 3 is a diagram illustrating a relationship between an interpolated value set and a torque value according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a distribution probability of a value group actually appearing during an actual driving process of an automobile according to an embodiment of the present application;
FIG. 5 is a flow chart illustrating a method of torque control of an engine according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a torque control device of an engine according to an embodiment of the present disclosure.
Detailed Description
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 a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For convenience of describing the embodiments of the present application, the basic concepts of the accelerator opening, the accelerator MAP, and the universal characteristic curve will be described first.
The accelerator opening is an opening of an accelerator pedal stepped on by a driver, and for convenience of description, the opening of the accelerator pedal stepped on by the driver is referred to as an accelerator opening.
The accelerator MAP is composed of accelerator opening, engine speed, and engine torque, and represents torque required by the driver at different accelerator openings.
The universal characteristic curve of the engine comprises an external characteristic curve of the engine and an equal fuel consumption rate curve of the engine. The engine characteristic reflected by the engine characteristic curve is that the engine characteristic curve is fixed under the condition that the engine is fixed and does not change along with the change of the engine speed, the accelerator opening or the engine torque during the running process of the automobile.
Fig. 1 is a schematic diagram of a throttle MAP and all-inclusive characteristic curves, in fig. 1, the abscissa represents engine speed, the ordinate represents torque, and the legend at the upper right corner distinguishes between different throttle opening degrees using different indicators, wherein the throttle opening degrees include 0.0%, 10.0%, 20.0%, 30.0%, 40.0%, 60.0%, 80.0%, and 100.0%, and any one of the indicator throttle opening degree curves in fig. 1 represents the torque required at any engine speed at the throttle opening degree indicated by the indicator. In fig. 1, the accelerator opening curve indicated by each index constitutes an accelerator MAP reflecting a correspondence relationship among the engine speed, the accelerator opening, and the torque.
It should be noted that, in fig. 1, the values of the accelerator opening and the curves under each accelerator opening are only examples, and are only for giving a visual representation of the accelerator MAP, and the accelerator MAP shown in fig. 1 is not represented as the accelerator MAP.
In fig. 1, the remaining curves except the accelerator MAP are all characteristic curves, in which the external characteristic curve of the engine corresponds to the black bold line in fig. 1, and the equal fuel consumption rate curves correspond to the plural non-bold curves composed of one circle as the center in fig. 1.
The external characteristic curve of the engine limits the values of the engine speed, the accelerator opening and the torque in the actual running process of the automobile. Specifically, any one set of the available values of the engine speed, the accelerator opening and the torque can only be located inside an external characteristic curve of the engine, namely, any one set of the available values of the engine speed, the accelerator opening and the torque can only be located inside a bold black line in fig. 2, namely, the area formed below the bold black line and inside the left side and the right side of the bold black line.
In the present embodiment, in the case where the engine speed and the accelerator opening are determined during the running of the automobile, the ECU is required to determine the engine torque value in that case, and the ECU determines the fuel injection amount of the engine based on the determined torque value and controls the fuel injection of the injector with the determined fuel injection amount. Therefore, it can be seen that in the running process of the automobile, the fuel injection amount of each time is related to the torque value determined by the ECU at that time, in order to reduce the fuel consumption in the running process of the automobile, the accelerator MAP needs to be optimized, and specifically, under each value group consisting of specific values of the engine speed and the accelerator opening in the accelerator MAP, the torque value combination consisting of the torque values corresponding to each value group is optimized, so that the torque value combination which can make the fuel consumption reach the lowest is the optimal torque value combination.
Specifically, fig. 2 illustrates an accelerator MAP optimization method provided by the present application, applied to an ECU, including the following steps:
s201, acquiring a value set and a torque range set for any data set.
In this embodiment, the value group is a value pair consisting of an actual value of the engine speed and an actual value of the accelerator opening, where one value of the engine speed and one value of the accelerator opening are one value group. Further, a value range of the torque value is set for each value group, and for convenience of description, a value range of the torque value set for any one value group is referred to as a torque range of the value group. The torque range set for any one value set represents: when the engine speed and the accelerator opening degree are in the value group, the torque of the engine may be any one of torque values in a torque range corresponding to the value group.
For example, the engine speed of any one of the value sets may be 600r/min, the accelerator opening may be 10.0%, and the set torque range may be (700Nm, 750 Nm).
Because the value of the engine speed and the value of the accelerator opening degree generally have various values in the driving process of the automobile, a plurality of value groups can be formed by the value of the engine speed and the value of the accelerator opening degree, of course, one value can be formed, and the number of the value groups is not limited in the embodiment. In this step, the manner of acquiring the value group and the manner of acquiring the torque range of any one value group in this step will be described by taking a plurality of value groups as an example.
Specifically, the method comprises the following two steps:
the first method comprises the following steps: manually entered sets of values are obtained, as well as manually set torque ranges for each set of values. Wherein, each numerical value group of manual input can be the numerical value group that satisfies the preset condition, and wherein, the preset condition can include: the accelerator MAP in fig. 1 indicates the correspondence.
In the accelerator MAP in fig. 1, a group of values consisting of values of the engine speed, the accelerator opening and the torque outside the limitation of the engine external characteristic curve is not calculated, and in order to ensure that each group of values of the engine speed, the accelerator opening and the torque can calculate the required oil injection amount, the preset conditions required by the manually input value group and the torque value range further include: the external characteristic of the engine.
And the second method comprises the following steps: the method comprises the following steps:
a1, acquiring the manually input value sets and the torque value at each manually input value set.
Each of the manually input value groups may be a value group and a torque value that satisfy the correspondence indicated by the accelerator MAP in fig. 1.
In order to ensure that the required oil injection quantity can be calculated by each set of values of the engine speed, the accelerator opening and the torque, in the accelerator MAP in fig. 1, the manually input numerical value set and the torque value need to satisfy the external characteristic curve of the engine in addition to the accelerator MAP in fig. 1.
And A2, interpolating the manually input value sets and the torque value of each manually input value set to obtain interpolated value sets and torque values of the interpolated value sets.
Since the accelerator opening degree in the accelerator MAP in fig. 1 includes: 0.0%, 10.0%, 20.0%, 30.0%, 40.0%, 60.0%, 80.0%, and 100.0%, and the number group consisting of the throttle opening and the engine speed is small. Therefore, in this step, the obtained value group and the torque value under each value are interpolated, so that the number groups obtained after interpolation are increased.
Specifically, the interpolated value sets are associated with the torque values at each interpolated value set, as shown in FIG. 3.
In fig. 3, a first row represents interpolated values of the engine speed, a first column represents interpolated values of the accelerator opening, one engine speed value in any row and one accelerator opening value in any column form a value group, and the values in the row and the column are torque values of the value group. For example, the engine speed 625r/min and the accelerator opening 2.5% form a value set, and the torque value of the value set is 219 Nm.
And A2, determining the torque range of the torque value under any one interpolated value group according to the preset step range.
Specifically, the preset step range may be determined according to actual conditions, and the preset step range is not limited in this embodiment, for example, the preset step range may be (-5, 5). In this step, a torque range is determined for the torque value under each interpolated value group according to the preset step range. Taking a value group consisting of an engine speed 625r/min and an accelerator opening of 2.5% and a torque value of 219Nm in the value group as an example, the torque range of the torque value is (219-5, 219+5), that is, the torque range of the value group is (214, 224).
S202, a torque value combination formed by one torque value in the torque range under each interpolated value group is optimized, and the corresponding torque value combination with the lowest comprehensive fuel consumption rate is obtained and is an optimal torque value combination.
In this embodiment, a torque value in the torque range of each interpolated value group may be used to obtain a plurality of torque value combinations, for any one torque value combination, a value group is formed by any one torque value in the torque value combination and the value group corresponding to the torque range to which the torque value belongs, and according to the equal fuel consumption rate curve, the fuel consumption rate required by the value group may be determined. In this step, the sum of the injected fuel quantities corresponding to the respective torque values in any one of the torque value combinations is referred to as the integrated fuel consumption rate corresponding to the torque value combination, and for the convenience of description, the integrated fuel consumption rate is referred to as the total injected fuel quantity.
Specifically, for any one torque value combination, an objective function expression for calculating the total fuel injection amount corresponding to the torque value combination is shown in the following formula (1):
Q＝x1+x2+x3+......+xn (1)
in the formula, Q represents the total fuel injection quantity, x, corresponding to any one torque value combination1……xnAnd respectively representing the fuel injection quantity corresponding to each torque value in the torque value combination, wherein the value of n is the total quantity of the torque values in the torque value combination.
In this embodiment, the essence of the optimization is: and determining the corresponding torque value combination with the lowest total fuel injection quantity from a plurality of torque value combinations formed by determining one torque value from the torque range of each value set. Specifically, in this step, an existing optimization algorithm may be adopted to determine an optimal torque value combination, and details of a specific optimization process are not described in this embodiment.
Through the optimization of the step, the corresponding relation between the value group and the torque value in the optimal torque value combination, that is, one torque value corresponding to one value group, can be obtained.
In this embodiment, for the value groups that may theoretically occur during the running of the automobile, the torque value combination formed by taking one torque value from the torque range in each value group is optimized to obtain the optimal torque value combination, that is, the optimal torque value combination determined in this step is the torque value combination with the lowest total fuel injection amount in the torque value combinations formed by the torque values corresponding to the value groups in the running of the automobile.
In the actual driving process of the automobile, the actually appearing value group may not be the value group which may exist in the embodiment, that is, the value group which appears in the actual driving process may be only one part of the value group which is optimized in the embodiment, and in order to obtain which actually appearing value groups are in the actual driving process of the automobile and the probability of the actually appearing any value group, the value groups which appear in the actual driving process of the automobile are counted to obtain a distribution probability diagram of the value groups shown in fig. 4.
It should be noted that the distribution probability table of the value groups in fig. 4 is obtained by counting the value groups that appear during a certain number of driving of a certain vehicle, and does not represent the distribution probabilities of the value groups that appear during all driving of all vehicles.
In fig. 4, the abscissa indicates the engine speed, the ordinate indicates the accelerator opening, and the value obtained by subtracting any one of the engine speed and any one of the accelerator opening in the graph indicates: the probability of occurrence of a numerical group consisting of the engine speed and the accelerator opening. As can be seen from FIG. 4, when the engine speed is (1050 ~ 1100) and the accelerator opening is (0 ~ 5), the probability of occurrence of this value group is 7.84%.
As can be seen from fig. 4, in the actual driving process of the vehicle corresponding to fig. 4, some value groups do not appear, the probability of some value groups appearing is higher, and the probability of some value groups appearing is lower. Therefore, in the present embodiment, in order to obtain a torque value combination that minimizes the total fuel injection amount during actual running of the vehicle, the present embodiment provides a method for controlling the vehicle. In this step, the objective function is updated, and the updated objective function is shown in the following formula (2):
Q1＝ax1+bx2+cx3+......+nxn (2)
in the formula, Q1Indicating the updated total fuel injection, x, for any one torque value combination1……xnRespectively representing the fuel injection quantity corresponding to each torque value in the torque value combination, wherein the value of n is the total quantity of the torque values in the torque value combination, and x1Coefficient a of (a) represents x1Probability, x, of occurrence of the corresponding value group during actual driving of the vehicle2Coefficient b of (a) represents x2Probability of occurrence of the corresponding value group in the actual driving process of the vehicle, and similarly, xnCoefficient n of (2) represents xnCorresponding toThe probability of occurrence of the set of values during the actual driving of the vehicle.
In practice, if the optimal torque value combination indicated in fig. 4 is desired with the lowest fuel consumption during driving of the vehicle, the coefficients in the updated objective function are the probability values counted in fig. 4. Of course, if an optimum torque value combination satisfying the specified numerical component distribution probability indication that fuel consumption is lowest during the running of the vehicle is desired, the coefficients in the updated objective function are the probability values in the specified numerical component distribution probability table.
And optimizing the torque value combination by taking the minimum value of the updated objective function as a target to obtain an optimal torque value combination, wherein the actual oil consumption in the actual running process of the automobile is closer to the total oil injection quantity corresponding to the optimal torque value combination, namely the oil consumption in the actual running process of the automobile is reduced.
The embodiment has the following beneficial effects:
has the beneficial effects of,
In this embodiment, for each acquired value group and a torque range under any one value group, a torque value combination formed by selecting one torque value from the torque range of each value group is optimized, so that the total fuel injection amount corresponding to the optimized torque value combination is the lowest, that is, the corresponding relationship between the torque value in the optimized torque value combination and each acquired value group is obtained. The torque value corresponding to the value group can be determined by utilizing the corresponding relation under the condition that the value group is known, and the required fuel injection amount is further determined according to the torque value to be reduced.
Has the beneficial effects of,
In this embodiment, in order to make the fuel consumption during the actual running of the vehicle approach the lowest total fuel injection amount for obtaining the optimal torque value combination, in the process of obtaining the optimal torque value combination by optimizing the torque value combination, the updated objective function is used to calculate the total fuel injection amount corresponding to the torque value combination. Compared with an unupdated objective function, in the updated objective function, the fuel injection quantity corresponding to each torque value is multiplied by the probability of the numerical group corresponding to the torque value appearing in the actual running process of the automobile, so that the optimal torque value combination obtained by optimizing the updated objective function is adopted, the fuel injection quantity required by each numerical group appearing in the actual running process of the automobile is determined, the fuel consumption in the actual whole running process of the automobile is closer to the total fuel injection quantity corresponding to the optimal torque value combination, and the fuel consumption of the automobile in the actual running process is lower.
Has the beneficial effects of,
In the updated objective function, the fuel injection amount corresponding to any torque value is multiplied by a coefficient, the coefficient represents the probability of the numerical value group corresponding to the torque value appearing in the actual running process of the automobile, namely for the numerical value group with the probability of zero appearing in the actual running process of the automobile, the fuel injection amount corresponding to the torque value of the numerical value is zero, namely the torque value is not in the torque value combination required to be optimized any more, therefore, the torque value amount in the torque value combination required to be optimized by the updated objective function is reduced, and further the calculation amount for optimizing the torque value combination can be reduced.
FIG. 5 shows a torque control method of an engine, applied to an ECU, including the following steps:
s501, under the condition that the current accelerator opening of a driver and the current rotating speed of an engine are collected, determining a target torque value from the established optimal accelerator MAP.
In this step, the target torque value in the optimal accelerator MAP is a torque value corresponding to the current throttle opening and the current engine speed. The optimal accelerator MAP is the corresponding relationship between the optimized value group and the torque value in the corresponding embodiment of fig. 2.
Specifically, in this step, when the current accelerator opening of the driver and the current rotation speed of the engine are acquired, a torque value corresponding to the current accelerator opening and the current rotation speed of the engine is obtained as a target torque value by searching the optimal accelerator MAP.
S502, determining the current fuel injection quantity according to the current throttle opening, the current engine rotating speed, the target torque value and the equal fuel consumption rate curve.
And determining the current throttle opening, the current rotating speed of the engine and the fuel injection quantity corresponding to the target torque value according to the equal fuel consumption curve of the engine. Specifically, the process of determining the fuel injection amount according to the equal fuel consumption curve is the prior art, and is not described herein again.
And S503, controlling the oil injector according to the current oil injection quantity.
Specifically, in this step, the process of controlling the fuel injection of the fuel injector according to the current fuel injection amount is the prior art, and is not described herein again.
FIG. 6 illustrates an engine torque control apparatus that includes an acquisition module 601, an execution module 602, and a control module 603.
The acquiring module 601 is configured to acquire a torque range corresponding to a value group, where any value group includes a rotation speed value and an accelerator opening value that satisfy a preset correspondence relationship of an engine, the correspondence relationship is a correspondence relationship between a rotation speed, an accelerator opening, and a torque of the engine, and the torque range corresponding to the value group includes at least one torque value, the executing module 602 is configured to combine torque values that make a comprehensive fuel consumption rate of the engine lowest as a target torque value combination, where any one torque value combination is formed by respectively taking one torque value from the torque range corresponding to each value group, and the controlling module 603 is configured to control to output a target torque, which is a torque corresponding to the value group in the target torque combination, when any value group is acquired.
Optionally, for any torque value combination made up of one torque value from the torque range corresponding to each value set, the integrated specific fuel consumption of the engine corresponding to the torque value combination is: the sum of the specific fuel consumption for each torque value in the combination of torque values. For any one torque value in the torque value combination, the fuel consumption rate corresponding to the torque value is determined according to the torque value, the value group corresponding to the torque range to which the torque value belongs, and the equal fuel consumption rate curve.
Optionally, for any torque value combination made up of one torque value from the torque range corresponding to each value set, the integrated specific fuel consumption of the engine corresponding to the torque value combination is: the sum of the target specific fuel consumption for each torque value in the combination of torque values. For any one torque value in the torque value combination, the target fuel consumption rate corresponding to the torque value is as follows: the product of the fuel consumption rate corresponding to the torque value and a target coefficient, wherein the fuel consumption rate corresponding to the torque value is determined according to the torque value, a numerical value group corresponding to a torque range to which the torque value belongs and an equal fuel consumption rate curve, and the target coefficient is the probability of occurrence of the numerical value group corresponding to the torque range to which the torque value belongs in the actual driving process of the automobile.
Optionally, the obtaining module 601 is configured to obtain a torque range corresponding to the set of values, and includes:
acquiring a torque value corresponding to the numerical value group meeting the preset condition; the preset conditions at least comprise a preset corresponding relation, the torque value corresponding to any one number group is added with the value in the preset step range to obtain a torque range corresponding to the torque value, and the torque range corresponding to the torque value is used as the torque range corresponding to the number group.
Optionally, the preset conditions further include: the external characteristic of the engine.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A torque control method of an engine, characterized by comprising:
acquiring a torque range corresponding to a value group, wherein any value group comprises a rotating speed value and an accelerator opening value which meet the preset corresponding relation of the engine, the corresponding relation is the corresponding relation of the rotating speed, the accelerator opening and the torque of the engine, and the torque range corresponding to the value group comprises at least one torque value;
combining torque values that minimize the integrated specific fuel consumption of the engine as a target torque value combination; any one torque value combination is formed by taking a torque value from the torque range corresponding to each numerical value group;
under the condition that any one numerical value group is collected, controlling to output a target torque, wherein the target torque is the torque corresponding to the numerical value group in the target torque value group;
for any torque value combination made up of one torque value from the torque range corresponding to each value group, the integrated specific fuel consumption of the engine corresponding to the torque value combination is: the sum of the target specific fuel consumption for each torque value in the combination of torque values;
for any one torque value in the torque value combination, the target fuel consumption rate corresponding to the torque value is as follows: the product of the fuel consumption rate corresponding to the torque value and the target coefficient, wherein the fuel consumption rate corresponding to the torque value is determined according to the torque value, a numerical value group corresponding to the torque range to which the torque value belongs and an equal fuel consumption rate curve; the target coefficient is a numerical value group corresponding to the torque range to which the torque value belongs, and is the probability of occurrence in the actual running process of the automobile;
the torque range corresponding to the set of obtained values includes: acquiring a torque value corresponding to the numerical value group meeting the preset condition; the preset conditions at least comprise the preset corresponding relation; and aiming at the torque value corresponding to any one numerical value group, adding the torque value and the numerical value in the preset step range to obtain a torque range corresponding to the torque value, and taking the torque range corresponding to the torque value as the torque range corresponding to the numerical value group.
2. The method of claim 1, wherein the preset condition further comprises: an outer characteristic of the engine.
3. A torque control device of an engine, characterized by comprising:
the system comprises an acquisition module, a comparison module and a judgment module, wherein the acquisition module is used for acquiring a torque range corresponding to a numerical value set, any one numerical value set comprises a rotating speed value and an accelerator opening value which meet the preset corresponding relation of the engine, the corresponding relation is the corresponding relation of the rotating speed, the accelerator opening and the torque of the engine, and the torque range corresponding to the numerical value set comprises at least one torque value;
an execution module for combining torque values that minimize a comprehensive fuel consumption rate of the engine as a target torque value combination; any one torque value combination is formed by taking a torque value from the torque range corresponding to each numerical value group;
the control module is used for controlling and outputting a target torque under the condition that any one numerical value group is collected, wherein the target torque is the torque corresponding to the numerical value group in the target torque value combination;
for any torque value combination made up of one torque value from the torque range corresponding to each value group, the integrated specific fuel consumption of the engine corresponding to the torque value combination is: the sum of the target specific fuel consumption for each torque value in the combination of torque values;
for any one torque value in the torque value combination, the target fuel consumption rate corresponding to the torque value is as follows: the product of the fuel consumption rate corresponding to the torque value and the target coefficient, wherein the fuel consumption rate corresponding to the torque value is determined according to the torque value, a numerical value group corresponding to the torque range to which the torque value belongs and an equal fuel consumption rate curve; the target coefficient is a numerical value group corresponding to the torque range to which the torque value belongs, and is the probability of occurrence in the actual running process of the automobile;
the obtaining module is used for obtaining a torque range corresponding to the value group, and comprises: acquiring a torque value corresponding to the numerical value group meeting the preset condition; the preset conditions at least comprise the preset corresponding relation;
adding the torque value and a value in a preset step range aiming at the torque value corresponding to any one value group to obtain a torque range corresponding to the torque value; and taking the torque range corresponding to the torque value as the torque range corresponding to the numerical value group.
4. The apparatus of claim 3, wherein the preset condition further comprises: an outer characteristic of the engine.
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