CN111379633A - Engine torque control method and device - Google Patents
Engine torque control method and device Download PDFInfo
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- CN111379633A CN111379633A CN202010217454.XA CN202010217454A CN111379633A CN 111379633 A CN111379633 A CN 111379633A CN 202010217454 A CN202010217454 A CN 202010217454A CN 111379633 A CN111379633 A CN 111379633A
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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
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
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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
- 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
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/26—Control of the engine output torque by applying a torque limit
Abstract
The embodiment of the invention provides an engine torque control method and device, wherein the method comprises the steps of firstly analyzing and obtaining the current running working condition type of a vehicle according to the running parameters of the vehicle, then obtaining a torque control strategy corresponding to the current running working condition type by utilizing the preset corresponding relation between various running working condition types and the torque control strategy, calculating the required torque of an engine, and further carrying out torque regulation on the engine. The adaptability of the vehicle to run under the complex and variable running conditions is improved, and the fuel-saving effect of the vehicle is further improved. Furthermore, after the running state of the vehicle meets the preset condition and enters the accelerator fixing mode, the required torque of the engine can be kept unchanged at a fixed value, the torque of the engine is ensured to be kept stable, and the fuel saving effect of the vehicle is further improved. And the economy and the dynamic property of the vehicle are comprehensively ensured through the matching of the overtaking mode and the torque limiting mode.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to an engine torque control method and device.
Background
The existing Vehicle can realize coordination and Control of a Vehicle power system through a VCU (Vehicle Control Unit), and reduce oil consumption and emission. The existing vehicle, especially the commercial vehicle, mainly uses the vehicle-mounted multi-power switch for fuel-saving control. The driver inputs different vehicle load states including heavy load, medium load and light load through the vehicle-mounted multi-power switch. Under different vehicle load states, the output of the engine is limited by using different maximum torques, and the fuel-saving control is realized. The method for vehicle fuel-saving control by utilizing the vehicle-mounted multi-power switch needs to depend on the manual input of a driver on one hand; on the other hand, the fuel-saving control is carried out only through different engine torque limits, and the fuel-saving effect is poor.
Disclosure of Invention
In view of this, the present invention provides a method and a device for controlling engine torque to improve fuel saving effect of a vehicle.
In order to achieve the above object, the following solutions are proposed:
in a first aspect, there is provided an engine torque control method comprising:
acquiring the running parameters of the vehicle;
calculating to obtain a driving condition characteristic value according to the operation parameters in a preset time period;
analyzing to obtain the type of the current running condition according to the characteristic value of the running condition;
calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running working condition, wherein the torque control strategy comprises the corresponding relation between the vehicle speed, the opening degree of an accelerator pedal and the torque;
and adjusting the torque of the engine according to the required torque and the actual torque of the engine.
Optionally, after the analyzing and obtaining that the current driving condition type is a plain high-speed condition or a mountain high-speed condition, and before performing torque adjustment on the engine, the method further includes:
judging whether the running state of the vehicle meets the precondition of entering a fixed throttle mode, if so, entering the fixed throttle mode;
and when the accelerator is in the accelerator fixing mode, keeping the required torque as a first torque value, wherein the first torque value is the torque obtained by calculation by using a torque control strategy corresponding to the current running working condition type when the accelerator is in the accelerator fixing mode.
Optionally, the preconditions include: the driving state of the vehicle maintains that the opening degree of an accelerator pedal is within a preset opening degree range, the opening degree change rate of the accelerator pedal is within a preset opening degree change rate range, the vehicle speed is within a preset vehicle speed range, and the time when the acceleration is smaller than a preset acceleration threshold value reaches a preset first duration threshold value.
Optionally, before the torque adjustment of the engine, the method further comprises:
judging whether the opening degree of an accelerator pedal is greater than a preset opening degree threshold value, if not, entering a torque limiting mode, if so, judging whether the duration of the opening degree of the accelerator pedal which is greater than the opening degree threshold value is greater than a preset second duration, if not, entering the torque limiting mode, and if so, entering a passing mode;
when the overtaking mode is adopted, after the required torque is obtained through calculation, the step of adjusting the torque of the engine according to the required torque and the actual torque of the engine is directly executed;
and when the engine is in a torque limiting mode, calculating a torque limiting and adjusting coefficient in real time, multiplying the torque limiting and adjusting coefficient by the required torque to obtain the limited and corrected required torque, and then adjusting the torque of the engine according to the limited and corrected required torque and the actual torque of the engine.
Optionally, calculating the torque limit adjustment coefficient specifically includes:
judging whether the absolute value of the difference value between the required torque and the actual torque of the engine is smaller than a preset torque limiting threshold value or not, if so, determining that the torque limiting adjustment coefficient is 1, and if not, obtaining an expected acceleration value according to the current gear of the vehicle and the current rotating speed of the engine;
calculating a torque limit adjustment coefficient by using a torque limit adjustment coefficient formula, wherein the torque limit adjustment coefficient formula is as follows:
in the formula, jmaxRepresenting the maximum threshold value of the torque limiting adjustment factor, jminIndicating a minimum threshold value for the torque limiting adjustment factor, adesRepresenting the desired acceleration and a representing the actual acceleration value.
In a second aspect, there is provided an engine torque control device comprising:
an operation parameter acquisition unit for acquiring an operation parameter of the vehicle;
the intermediate parameter calculation unit is used for calculating to obtain a driving condition characteristic value according to the operation parameters in a preset time period;
the driving condition determining unit is used for analyzing and obtaining the type of the current driving condition according to the driving condition characteristic value;
the required torque calculation unit is used for calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running working condition, and the torque control strategy comprises the corresponding relation between the vehicle speed, the opening degree of an accelerator pedal and the torque;
and the torque control unit is used for adjusting the torque of the engine according to the required torque and the actual torque of the engine.
Optionally, the engine torque control device further comprises:
the fixed throttle mode judging unit is used for judging whether the running state of the vehicle meets the precondition of entering the fixed throttle mode or not after the current running working condition type is analyzed to be a plain high-speed working condition or a mountain high-speed working condition and before the torque of the engine is adjusted; if yes, entering a fixed throttle mode;
the required torque calculation unit is further configured to, when the vehicle is in the throttle setting mode, maintain the required torque as a first torque value, and when the first torque value enters the throttle setting mode, calculate the required torque of the engine by using a torque control strategy corresponding to the current driving condition type.
Optionally, the preconditions include: the driving state of the vehicle maintains that the opening degree of an accelerator pedal is within a preset opening degree range, the opening degree change rate of the accelerator pedal is within a preset opening degree change rate range, the vehicle speed is within a preset vehicle speed range, and the time when the acceleration is smaller than a preset acceleration threshold value reaches a preset first duration threshold value.
Optionally, the engine torque control device further includes:
the rapid acceleration limiting unit is used for judging whether the opening of an accelerator pedal is larger than a preset opening threshold value before torque adjustment is carried out on the engine, and if not, entering a torque limiting mode;
the overtaking mode judging unit is used for judging whether the duration that the opening degree of an accelerator pedal is greater than the opening degree threshold value is greater than a preset second duration or not when the judgment result of the emergency acceleration limiting unit is yes, entering the torque limiting mode if the duration is not greater than the second duration, and entering the overtaking mode if the duration is greater than the second duration;
the required torque calculation unit is further configured to:
when the vehicle is in the overtaking mode, directly executing a step of adjusting the torque of the engine according to the required torque and the actual torque of the engine after calculating the required torque;
and when the engine is in a torque limiting mode, calculating a torque limiting and adjusting coefficient in real time, multiplying the torque limiting and adjusting coefficient by the required torque to obtain the limited and corrected required torque, and then adjusting the torque of the engine according to the limited and corrected required torque and the actual torque of the engine.
Optionally, the calculating the torque limit adjustment coefficient by the required torque calculating unit specifically includes:
judging whether the absolute value of the difference value between the required torque and the actual torque of the engine is smaller than a preset torque limiting threshold value or not, if so, determining that the torque limiting adjustment coefficient is 1, and if not, obtaining an expected acceleration value according to the current gear of the vehicle and the current rotating speed of the engine;
calculating a torque limit adjustment coefficient by using a torque limit adjustment coefficient formula, wherein the torque limit adjustment coefficient formula is as follows:
in the formula, jmaxRepresenting the maximum threshold value of the torque limiting adjustment factor, jminIndicating a minimum threshold value for the torque limiting adjustment factor, adesRepresenting the desired acceleration and a representing the actual acceleration value.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the method and the device for controlling the torque of the engine, the current running working condition type of the vehicle is obtained through analysis according to the running parameters of the vehicle, then the torque control strategy corresponding to the current running working condition type is obtained through the preset corresponding relation between various running working condition types and the torque control strategy, the required torque of the engine is calculated, and then the torque of the engine is adjusted. The adaptability of the vehicle to run under the complex and variable running conditions is improved, and the oil saving effect of the vehicle is further improved.
After the running state of the vehicle meets the preset condition and enters the accelerator fixing mode, the required torque of the engine is kept unchanged at a fixed value, the torque of the engine is ensured to be kept stable, the fuel saving effect of the vehicle is further improved, and the economical efficiency of running under the high-speed working condition is further ensured.
When the required power of a driver is high, entering a passing mode without limiting the required torque of the engine; when the driver's demand power is not high, a torque limiting mode is entered, and the demand torque of the engine is limited according to a torque limit adjustment coefficient. The economy and the dynamic property of the vehicle are comprehensively ensured through the matching of the overtaking mode and the torque limiting mode.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method of engine torque control according to an embodiment of the present invention;
FIG. 2 is a flow chart of another engine torque control method provided by an embodiment of the present invention;
FIG. 3 is a flow chart of yet another engine torque control method provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of an engine torque control arrangement provided in accordance with an embodiment of the present invention;
fig. 5 is a schematic view of a vehicle control unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 provides a method for engine torque control according to an embodiment of the present invention, which may include the steps of:
s11: the operating parameters of the vehicle are acquired.
The operating parameters of the vehicle in this embodiment include, but are not limited to, vehicle speed Ve, acceleration a, angular velocity w, clutch switch clutchSW, and neutral switch NgearSW.
S12: and calculating to obtain a driving condition characteristic value according to the running parameters of the vehicle in the preset time period.
And step S11 is executed, the running parameters of the vehicle in a period of time are subjected to statistical analysis, and the characteristic value of the running condition is obtained. When the analyzed running parameters of the vehicle comprise vehicle speed Ve, acceleration a, angular speed w, clutch switch clutchSW and neutral switch NgearSW, the obtained running condition characteristic values comprise average vehicle speed, average acceleration, maximum vehicle speed, maximum acceleration, maximum gradient, uphill mileage, engine idle time and the like. The angular velocity w is the angular rate of change of the vehicle in the vertical direction, i.e. the angular rate of change of the vehicle on an uphill slope or a downhill slope, as acquired by the sensor. According to the angular speed w, the vehicle speed Ve and the acceleration a, the gradient of the road can be calculated, the specific calculation process is the prior art, and the detailed description is omitted.
S13: and analyzing to obtain the type of the current running condition according to the characteristic value of the running condition.
And carrying out statistics in advance to obtain the corresponding relation between the driving condition type and the driving condition characteristic value range. For a certain type of running condition characteristics and different running condition types, corresponding to a corresponding running condition characteristic value range. For example, the driving condition types may be specifically classified into an urban area working condition, a national road working condition and a high-speed working condition; for the characteristic of the running condition of the average vehicle speed, the range of less than 30km/h corresponds to urban working conditions, the range of 30-60 km/h corresponds to national road working conditions, and the range of more than 60km/h corresponds to high-speed working conditions. The driving condition types can be divided into urban area working conditions, plain national road working conditions, plain high-speed working conditions, mountain national road working conditions and mountain high-speed working conditions, and the vehicle torque control is more accurate by refining the driving condition types.
When step S13 is executed during the actual running of the vehicle, the running condition type corresponding to each type of running condition characteristic value is matched by using the correspondence between the running condition type obtained by statistics in advance and the running condition characteristic value range, so as to obtain the current running condition type. It should be noted that, when the driving condition types obtained by matching include two or more types, the driving condition type with the highest matching success frequency is used as the current driving condition type. For example, the running condition characteristics comprise three types, namely average speed, average acceleration and engine idle time, the average speed and the average acceleration correspond to urban working conditions, and the number of successful urban working condition matching times is two; the idle time of the engine corresponds to a high-speed working condition, and the successful matching times of the high-speed working condition is one time; and determining that the type of the current running working condition is the urban working condition.
S14: and calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running condition.
The torque control strategy is torque MAP, which refers to the corresponding relation between the vehicle speed, the opening degree of an accelerator pedal and the torque. A corresponding torque control strategy is preset for each driving condition type. When step S14 is executed in the actual running process of the vehicle, a torque control strategy corresponding to the current running condition type is obtained by using the preset corresponding relationship between the running condition type and the torque control strategy; and calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running working condition, namely matching the required torque to obtain the corresponding torque as the required torque of the engine according to the current speed of the vehicle and the opening degree of an accelerator pedal.
S15: and adjusting the torque of the engine according to the required torque and the actual torque of the engine.
The process of adjusting the torque of the engine according to the required torque and the actual torque of the engine is the prior art and is not described in detail herein.
According to the engine torque control method provided by the embodiment, the current running working condition type of the vehicle is obtained through analysis according to the running parameters of the vehicle, then the torque control strategy corresponding to the current running working condition type is obtained through the preset corresponding relation between various running working condition types and the torque control strategy, the required torque of the engine is calculated, and further the torque of the engine is adjusted. The adaptability of the vehicle to run under the complex and variable running conditions is improved, and the oil saving effect of the vehicle is further improved.
Fig. 2 is another engine torque control method provided in an embodiment of the present invention, and compared with the engine torque control method provided in fig. 1, after analyzing that the current driving condition type is a plain high-speed condition or a mountain high-speed condition, and before performing torque adjustment on the engine, the method further includes a throttle control determining process, and specifically, the method may include the following steps:
s21: the operating parameters of the vehicle are acquired.
S22: and calculating to obtain a driving condition characteristic value according to the running parameters of the vehicle in the preset time period.
S23: and analyzing to obtain the type of the current running condition according to the characteristic value of the running condition.
Steps S21 to S23 are the same as steps S11 to S13, and are not described again in this embodiment. And (4) executing step S24 after the current driving working condition type is analyzed to be the plain high-speed working condition or the mountain high-speed working condition, and executing step S25 after the current driving working condition type is analyzed to be the driving working condition type.
S24: and judging whether the vehicle running state meets the precondition of entering the throttle setting mode, if so, entering the throttle setting mode, and if not, executing the step S25.
The precondition for entering the throttle setting mode includes: the driving state of the vehicle maintains that the accelerator opening AccPdl is within a preset opening range, the accelerator opening change rate dt _ AccPdl is within a preset opening change rate range, the vehicle speed Ve is within a preset vehicle speed range, and the time when the acceleration a is smaller than a preset acceleration threshold reaches a preset first duration threshold. I.e. the duration for which the following condition is fulfilled reaches the first duration threshold.
In the formula, VeminMinimum threshold value, V, representing constant throttle mode vehicle speedemaxRepresenting a maximum threshold value of vehicle speed in a fixed throttle mode, amaxIndicating a fixed throttle mode acceleration maximum threshold, AccPdlminIndicating a minimum threshold value of accelerator opening for a fixed throttle mode, AccPdlmaxIndicating a maximum threshold for accelerator pedal opening in a fixed throttle mode, dAccPdlminIndicating a minimum threshold value for the rate of change of accelerator pedal opening in a fixed throttle mode, dAccPdlmaxRepresenting a fixed throttle mode accelerator pedal opening rate maximum threshold.
And when the accelerator is in the fixed accelerator mode, keeping the required torque of the engine as a first torque value, and when the first torque value enters the fixed accelerator mode, calculating the required torque of the engine by using a torque control strategy corresponding to the current running condition type.
S25: and calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running condition.
S26: and adjusting the torque of the engine according to the required torque and the actual torque of the engine.
Steps S25 and S26 are identical to steps S14 and S15, and the present embodiment is not described in detail.
Whether the throttle mode is entered or not, there is an output of the required torque of the engine. When the preset condition is met and the throttle mode is entered, the output required torque of the engine is always the first torque value, and step S26 is executed to perform torque adjustment on the engine according to the first torque value and the actual torque. And when the throttle mode is not started, calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running condition in real time, and performing torque adjustment on the engine according to the required torque and the actual torque of the engine calculated in the step S25 in the step S26. After the running state of the vehicle meets the preset condition and enters the throttle setting mode, the required torque of the engine is kept unchanged at a fixed value, the torque of the engine is ensured to be kept stable, the fuel-saving effect of the vehicle is further improved, and the economical efficiency of running under the high-speed working condition is further ensured.
Fig. 3 is a further engine torque control method provided by an embodiment of the present invention, compared to the engine torque control method provided in fig. 2, before the engine is subjected to torque adjustment, the method further includes a rapid acceleration limiting process, and specifically, the method may include the following steps:
s31: the operating parameters of the vehicle are acquired.
S32: and calculating to obtain a driving condition characteristic value according to the running parameters of the vehicle in the preset time period.
S33: and analyzing to obtain the type of the current running condition according to the characteristic value of the running condition.
S34: and judging whether the vehicle running state meets the precondition of entering the throttle setting mode, if so, entering the throttle setting mode, and if not, executing the step S35.
S35: and calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running condition.
S36: and judging whether the opening degree of the accelerator pedal is larger than a preset opening degree threshold value, if not, executing step S37, and if so, executing step S38.
S37: a torque limiting mode is entered.
And when the engine is in the torque limiting mode, calculating a torque limiting adjustment coefficient in real time, multiplying the torque limiting adjustment coefficient by the required torque of the engine to obtain the limited and corrected required torque, and executing a step S39 to perform torque adjustment on the engine according to the limited and corrected required torque and the actual torque of the engine. Note that the accelerator pedal opening threshold preset in step S36 is not less than the accelerator pedal opening maximum threshold AccPdl in the fixed accelerator modemaxWhen the vehicle enters the fixed throttle mode first, the opening degree of an accelerator pedal exceeds AccPdlmaxBut is smaller than the accelerator pedal opening threshold, the required torque of the engine is the first torque value in the fixed throttle mode, and if the vehicle does not meet the condition of entering the fixed throttle mode from the beginning, the required torque of the engine is the required torque of the engine calculated by utilizing a torque control strategy corresponding to the current running condition type in real time.
Calculating a torque limit adjustment coefficient, which specifically comprises: judging whether the absolute value of the difference value between the required torque of the engine and the actual torque of the engine is smaller than a preset torque limiting threshold value or not, if so, determining that the torque limiting adjustment coefficient is 1, and if not, obtaining an expected acceleration value according to the current gear of the vehicle and the current rotating speed of the engine; calculating to obtain a torque limit adjusting coefficient by using a torque limit adjusting coefficient formula, wherein the torque limit adjusting coefficient j formula is as follows:
in the formula, jmaxRepresenting the maximum threshold value of the torque limiting adjustment factor, jminIndicating a minimum threshold value for the torque limiting adjustment factor, adesRepresenting the desired acceleration and a representing the actual acceleration value. The torque limit adjustment factor is formulated as j-1- ((a-a)des)/ades) J is obtained; if j is obtained by calculation and is more than or equal to jmaxJ is then jmax(ii) a If j is less than or equal to j obtained by calculationminJ is then jmin(ii) a If the calculated j is in the interval (j)min，jmax) The value of j is unchanged.
The corresponding relation between the gear and the rotating speed of the engine and the expected acceleration value can be calibrated in advance in a whole vehicle factory, and when the torque limit adjusting coefficient is calculated in the actual running process of the vehicle, the expected acceleration value corresponding to the current gear of the vehicle and the current rotating speed of the engine can be obtained through matching according to the corresponding relation between the gear and the rotating speed of the engine and the expected acceleration value.
S38: and judging whether the duration that the opening degree of the accelerator pedal is greater than the opening degree threshold is greater than a preset second duration, if not, executing step S37, and if so, entering a passing mode.
In the overtaking mode, after the required torque of the engine is calculated, step S39 is directly executed. When the required power of a driver is high, entering a passing mode without limiting the required torque of the engine; when the driver's demand power is not high, a torque limiting mode is entered, and the demand torque of the engine is limited according to a torque limit adjustment coefficient. The economy and the dynamic property of the vehicle are comprehensively ensured through the matching of the overtaking mode and the torque limiting mode.
S39: and adjusting the torque of the engine according to the required torque and the actual torque of the engine.
Steps S31 to S35 and S38 are consistent with steps S21 to S25 and S26, respectively, and are not described again in this embodiment.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Fig. 4 shows an engine torque control device according to an embodiment of the present invention, which includes an operation parameter obtaining unit 41, an intermediate parameter calculating unit 42, a driving condition determining unit 43, a required torque calculating unit 44, and a torque control unit 45.
An operation parameter acquiring unit 41 for acquiring an operation parameter of the vehicle.
And the intermediate parameter calculating unit 42 is configured to calculate a driving condition characteristic value according to the operating parameters of the vehicle within the preset time period.
And the driving condition determining unit 43 is configured to analyze the current driving condition type according to the driving condition characteristic value.
And the required torque calculation unit 44 is used for calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running condition, wherein the torque control strategy comprises the corresponding relation between the vehicle speed, the opening degree of an accelerator pedal and the torque.
And a torque control unit 45 for performing torque adjustment on the engine according to the required torque of the engine and the actual torque of the engine.
Alternatively, the engine torque control device may further include: and the accelerator fixing mode judging unit is used for judging whether the running state of the vehicle meets the precondition for entering the accelerator fixing mode or not after the current running working condition type is analyzed to be the plain high-speed working condition or the mountain high-speed working condition and before the torque of the engine is adjusted, and if so, entering the accelerator fixing mode.
The required torque calculation unit 45 is further configured to, when the vehicle is in the throttle-fixed mode, maintain the required torque of the engine as a first torque value, and when the first torque value is in the throttle-fixed mode, calculate the required torque of the engine by using a torque control strategy corresponding to the current driving condition type.
The precondition for entering the throttle setting mode includes: the driving state of the vehicle maintains that the opening degree of an accelerator pedal is within a preset opening degree range, the opening degree change rate of the accelerator pedal is within a preset opening degree change rate range, the vehicle speed is within a preset vehicle speed range, and the time when the acceleration is smaller than a preset acceleration threshold value reaches a preset first duration threshold value.
Alternatively, the engine torque control device may further include: and the rapid acceleration limiting unit is used for judging whether the opening of an accelerator pedal is larger than a preset opening threshold value before torque adjustment is carried out on the engine, and if not, entering a torque limiting mode.
And the overtaking mode judging unit is used for judging whether the duration that the opening degree of the accelerator pedal is greater than the opening degree threshold value is greater than a preset second duration or not when the judgment result of the emergency acceleration limiting unit is yes, entering a torque limiting mode if the duration is not greater than the second duration, and entering the overtaking mode if the duration is greater than the second duration.
The required torque calculation unit 45 is also configured to: when the vehicle overtaking mode is adopted, after the required torque of the engine is obtained through calculation, the step of adjusting the torque of the engine according to the required torque and the actual torque of the engine is directly executed; and when the engine is in the torque limiting mode, calculating a torque limiting and adjusting coefficient in real time, multiplying the torque limiting and adjusting coefficient by the required torque of the engine to obtain the limited and corrected required torque, and then adjusting the torque of the engine according to the limited and corrected required torque and the actual torque of the engine.
Optionally, the required torque calculating unit 45 calculates a torque limit adjustment coefficient, which specifically includes: judging whether the absolute value of the difference value between the required torque of the engine and the actual torque of the engine is smaller than a preset torque limiting threshold value or not, if so, determining that the torque limiting adjustment coefficient is 1, and if not, obtaining an expected acceleration value according to the current gear of the vehicle and the current rotating speed of the engine; calculating to obtain a torque limit adjusting coefficient by using a torque limit adjusting coefficient formula, wherein the torque limit adjusting coefficient formula is as follows:
in the formula, jmaxRepresenting the maximum threshold value of the torque limiting adjustment factor, jminIndicating a minimum threshold value for the torque limiting adjustment factor, adesRepresenting the desired acceleration and a representing the actual acceleration value.
Fig. 5 is a vehicle control unit according to an embodiment of the present invention. The hardware structure of the vehicle control unit may include: at least one processor 51, at least one communication interface 52, at least one memory 53 and at least one communication bus 54; and the processor 51, the communication interface 52 and the memory 53 complete communication with each other through the communication bus 54.
The processor 51 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), one or more Integrated circuits configured to implement embodiments of the present invention, or the like in some embodiments.
The communication interface 52 is generally used to establish a communication link between the vehicle control unit and other electronic devices or systems.
The memory 53 includes at least one type of readable storage medium. The readable storage medium may be an NVM (non-volatile memory) such as flash memory, hard disk, multimedia card, card-type memory, etc. The readable storage medium may also be a high-speed RAM (random access memory) memory.
Wherein the memory 53 stores a computer program and the processor 51 may invoke the computer program stored in the memory 53 for:
acquiring the running parameters of the vehicle;
calculating to obtain a driving condition characteristic value according to the running parameters of the vehicle in a preset time period;
analyzing to obtain the type of the current running condition according to the characteristic value of the running condition;
calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running working condition, wherein the torque control strategy comprises the corresponding relation between the vehicle speed, the opening degree of an accelerator pedal and the torque;
and adjusting the torque of the engine according to the required torque of the engine and the actual torque of the engine.
The refinement function and the extension function of the program may be referred to as described above.
FIG. 5 only shows the vehicle control unit with components 51-54, but it should be understood that not all of the shown components are required and that more or fewer components may alternatively be implemented.
An embodiment of the present invention further provides a readable storage medium, where the readable storage medium may store a program adapted to be executed by a processor, where the program is configured to:
acquiring the running parameters of the vehicle;
calculating to obtain a driving condition characteristic value according to the running parameters of the vehicle in a preset time period;
analyzing to obtain the type of the current running condition according to the characteristic value of the running condition;
calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running working condition, wherein the torque control strategy comprises the corresponding relation between the vehicle speed, the opening degree of an accelerator pedal and the torque;
and adjusting the torque of the engine according to the required torque of the engine and the actual torque of the engine.
The refinement function and the extension function of the program may be referred to as described above.
The above-described embodiments of the apparatus are merely illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts shown as units may or may not be physical units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the present specification, the emphasis points of the embodiments are different from those of the other embodiments, and the same and similar parts among the embodiments may be 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 invention. 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 invention. Thus, the present invention 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 (10)
1. An engine torque control method, characterized by comprising:
acquiring the running parameters of the vehicle;
calculating to obtain a driving condition characteristic value according to the operation parameters in a preset time period;
analyzing to obtain the type of the current running condition according to the characteristic value of the running condition;
calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running working condition, wherein the torque control strategy comprises the corresponding relation between the vehicle speed, the opening degree of an accelerator pedal and the torque;
and adjusting the torque of the engine according to the required torque and the actual torque of the engine.
2. The engine torque control method according to claim 1, wherein after the analyzing that the current driving condition type is a plain high-speed condition or a mountain high-speed condition, and before the engine is subjected to torque adjustment, the method further comprises:
judging whether the running state of the vehicle meets the precondition of entering a fixed throttle mode, if so, entering the fixed throttle mode;
and when the accelerator is in the accelerator fixing mode, keeping the required torque as a first torque value, wherein the first torque value is the torque obtained by calculation by using a torque control strategy corresponding to the current running working condition type when the accelerator is in the accelerator fixing mode.
3. The engine torque control method according to claim 2, characterized in that the precondition includes: the driving state of the vehicle maintains that the opening degree of an accelerator pedal is within a preset opening degree range, the opening degree change rate of the accelerator pedal is within a preset opening degree change rate range, the vehicle speed is within a preset vehicle speed range, and the time when the acceleration is smaller than a preset acceleration threshold value reaches a preset first duration threshold value.
4. The engine torque control method according to claim 1 or 2, characterized by, before the torque adjustment of the engine, further comprising:
judging whether the opening degree of an accelerator pedal is greater than a preset opening degree threshold value, if not, entering a torque limiting mode, if so, judging whether the duration of the opening degree of the accelerator pedal which is greater than the opening degree threshold value is greater than a preset second duration, if not, entering the torque limiting mode, and if so, entering a passing mode;
when the overtaking mode is adopted, after the required torque is obtained through calculation, the step of adjusting the torque of the engine according to the required torque and the actual torque of the engine is directly executed;
and when the engine is in a torque limiting mode, calculating a torque limiting and adjusting coefficient in real time, multiplying the torque limiting and adjusting coefficient by the required torque to obtain the limited and corrected required torque, and then adjusting the torque of the engine according to the limited and corrected required torque and the actual torque of the engine.
5. The engine torque control method according to claim 4, wherein calculating the torque limit adjustment factor specifically includes:
judging whether the absolute value of the difference value between the required torque and the actual torque of the engine is smaller than a preset torque limit threshold value or not, and if so, determining that the torque limit adjustment coefficient is 1;
if not, obtaining an expected acceleration value according to the current gear of the vehicle and the current rotating speed of the engine;
calculating a torque limit adjusting coefficient by using a torque limit adjusting coefficient formula, wherein the torque limit adjusting coefficient j is calculated by the following formula:
in the formula, jmaxRepresenting the maximum threshold value of the torque limiting adjustment factor, jminIndicating a minimum threshold value for the torque limiting adjustment factor, adesRepresenting the desired acceleration and a representing the actual acceleration value.
6. An engine torque control device characterized by comprising:
an operation parameter acquisition unit for acquiring an operation parameter of the vehicle;
the intermediate parameter calculation unit is used for calculating to obtain a driving condition characteristic value according to the operation parameters in a preset time period;
the driving condition determining unit is used for analyzing and obtaining the type of the current driving condition according to the driving condition characteristic value;
the required torque calculation unit is used for calculating the required torque of the engine by using a torque control strategy corresponding to the type of the current running working condition, and the torque control strategy comprises the corresponding relation between the vehicle speed, the opening degree of an accelerator pedal and the torque;
and the torque control unit is used for adjusting the torque of the engine according to the required torque and the actual torque of the engine.
7. The engine torque control device according to claim 6, characterized by further comprising:
the fixed throttle mode judging unit is used for judging whether the running state of the vehicle meets the precondition of entering the fixed throttle mode or not after the current running working condition type is analyzed to be a plain high-speed working condition or a mountain high-speed working condition and before the torque of the engine is adjusted; if yes, entering a fixed throttle mode;
the required torque calculation unit is further configured to, when the vehicle is in the throttle setting mode, maintain the required torque as a first torque value, and when the first torque value enters the throttle setting mode, calculate the required torque of the engine by using a torque control strategy corresponding to the current driving condition type.
8. The engine torque control device according to claim 7, characterized in that the precondition includes: the driving state of the vehicle maintains that the opening degree of an accelerator pedal is within a preset opening degree range, the opening degree change rate of the accelerator pedal is within a preset opening degree change rate range, the vehicle speed is within a preset vehicle speed range, and the time when the acceleration is smaller than a preset acceleration threshold value reaches a preset first duration threshold value.
9. The engine torque control device according to claim 6 or 7, characterized by further comprising:
the rapid acceleration limiting unit is used for judging whether the opening of an accelerator pedal is larger than a preset opening threshold value before torque adjustment is carried out on the engine, and if not, entering a torque limiting mode;
the overtaking mode judging unit is used for judging whether the duration that the opening degree of an accelerator pedal is greater than the opening degree threshold value is greater than a preset second duration or not when the judgment result of the emergency acceleration limiting unit is yes, entering the torque limiting mode if the duration is not greater than the second duration, and entering the overtaking mode if the duration is greater than the second duration;
the required torque calculation unit is further configured to:
when the vehicle overtaking mode is adopted, after the required torque is obtained through calculation, the step of adjusting the torque of the engine according to the required torque and the actual torque of the engine is directly executed;
and when the engine is in a torque limiting mode, calculating a torque limiting and adjusting coefficient in real time, multiplying the torque limiting and adjusting coefficient by the required torque to obtain the limited and corrected required torque, and then adjusting the torque of the engine according to the limited and corrected required torque and the actual torque of the engine.
10. The engine torque control device according to claim 9, wherein the required torque calculation unit calculates the torque limit adjustment coefficient specifically includes:
judging whether the absolute value of the difference value between the required torque and the actual torque of the engine is smaller than a preset torque limit threshold value or not, and if so, determining that the torque limit adjustment coefficient is 1;
if not, obtaining an expected acceleration value according to the current gear of the vehicle and the current rotating speed of the engine;
calculating a torque limit adjusting coefficient by using a torque limit adjusting coefficient formula, wherein the torque limit adjusting coefficient j is calculated by the following formula:
in the formula，jmaxRepresenting the maximum threshold value of the torque limiting adjustment factor, jminIndicating a minimum threshold value for the torque limiting adjustment factor, adesRepresenting the desired acceleration and a representing the actual acceleration value.
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| CN113459831A (en) * | 2021-08-03 | 2021-10-01 | 山东临工工程机械有限公司 | Electric vehicle motor interactive control method and device and electric vehicle |
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| CN114876656A (en) * | 2022-04-18 | 2022-08-09 | 东风柳州汽车有限公司 | Control method, device and equipment for improving power shortage and storage medium |
| CN115288872B (en) * | 2022-08-12 | 2024-01-12 | 潍柴动力股份有限公司 | Torque control method, device and system |
| CN115288872A (en) * | 2022-08-12 | 2022-11-04 | 潍柴动力股份有限公司 | Torque control method, device and system |
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