CN113007336A - Automatic transmission downshift control method and device and working machine - Google Patents
Automatic transmission downshift control method and device and working machine Download PDFInfo
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- CN113007336A CN113007336A CN202110190319.5A CN202110190319A CN113007336A CN 113007336 A CN113007336 A CN 113007336A CN 202110190319 A CN202110190319 A CN 202110190319A CN 113007336 A CN113007336 A CN 113007336A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
- F16H59/70—Inputs being a function of gearing status dependent on the ratio established
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/50—Inputs being a function of the status of the machine, e.g. position of doors or safety belts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
Abstract
The invention provides a method, a device and an operating machine for controlling the gear reduction of an automatic transmission, wherein the method does not need to judge and distinguish the gear reduction number modes in advance, so that the gear reduction modes do not need to be analyzed and judged one by one, the calculated amount and the calibration workload are reduced, and the calculating speed is improved; the number of downshifts is not limited, the target gear can be calculated in one step, and the method is suitable for downshifting control of mechanical automatic transmissions with different gear numbers and gear ratios, in particular to a multi-gear mechanical automatic transmission of a heavy vehicle; the method has high flexibility and can meet various requirements of grade-crossing downshift.
Description
Technical Field
The invention relates to the technical field of mechanical control, in particular to a downshift control method and device for an automatic transmission and an operating machine.
Background
At present, because an Automated Mechanical Transmission (AMT) has a phenomenon of power interruption during a gear shifting process, how to implement timely and reasonable automatic downshift in a complex and variable vehicle driving condition is one of the difficulties of a vehicle control strategy.
In the prior art, when an automatic transmission is controlled to downshift, a method is generally adopted, in which downshift number patterns, such as 1-gear downshift, 2-gear downshift, 3-gear downshift and the like, are predetermined according to vehicle running conditions, such as vehicle speed, accelerator, acceleration, gradient and other parameters, and then downshift points of different downshift number patterns are determined. The method has the disadvantages that complex analysis needs to be carried out on various working condition parameters, the requirement of the number of downshifts is distinguished, each downshift number mode needs to calibrate the corresponding downshift point vehicle speed in advance, the calculated amount is large, the parameter calibration workload is large, the level of the engine speed after downshift is difficult to ensure, and if the engine speed after downshift is too low, the vehicle power is possibly insufficient. The other method is that the expected engine speed after the gear 3, 2 and 1 are reduced is estimated in sequence, the expected engine speed is compared with the preset maximum allowable engine speed, and if the expected engine speed after the gear reduction is finished is less than the preset maximum allowable engine speed, the gear reduction is considered to be feasible, and the gear reduction operation is started. The method has the disadvantages that as the gears of the gearbox are increased, particularly as the automatic transmission of a heavy commercial vehicle is usually 12 gears, 14 gears or 16 gears, and the number of downshifts is required to be more than 3 under some special working conditions, the expected engine speed for the 4-gear downshift condition needs to be increased for estimation, so that the method cannot flexibly meet the downshifting requirements of the multi-gear automatic transmission, and the calculation amount is large.
Disclosure of Invention
The invention provides a downshift control method and device for an automatic transmission and an operating machine, which are used for overcoming the defects in the prior art.
The invention provides a downshift control method of an automatic transmission, which comprises the following steps:
if the fact that the automatic transmission of the target vehicle meets the downshift condition is judged and obtained, determining an expected engine speed value and a predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on vehicle working condition information of the target vehicle;
determining a speed ratio expected value of the target vehicle after the automatic transmission is downshifted based on the engine speed expected value and the vehicle speed predicted value;
and determining a target gear corresponding to the expected speed ratio value based on the corresponding relation between the speed ratio and the automatic transmission gear, and performing downshift control on the automatic transmission based on the target gear.
According to the automatic transmission downshift control method provided by the invention, the method for determining the expected engine speed value and the predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on the vehicle condition information of the target vehicle further comprises the following steps:
acquiring vehicle working condition information of the target vehicle, wherein the vehicle working condition information comprises the rotating speed of an engine;
and comparing the engine speed with a downshift point engine speed threshold, and determining that the automatic transmission meets a downshift condition if the engine speed is judged to be less than or equal to the downshift point engine speed threshold.
According to the automatic transmission downshift control method provided by the invention, the vehicle working condition information further comprises a current gear, an accelerator pedal opening and mechanical parameters of the target vehicle;
accordingly, the downshift point engine speed threshold is determined based on the following method:
calculating an initial threshold value of the rotating speed of the engine at the gear reduction point based on the current gear and the opening degree of the accelerator pedal;
and correcting the initial threshold value of the rotating speed of the gear-down point engine based on the opening degree of the accelerator pedal and the mechanical parameters to obtain the threshold value of the rotating speed of the gear-down point engine.
According to the automatic transmission downshift control method provided by the invention, the mechanical parameters comprise driving resistance and atmospheric pressure; accordingly, the number of the first and second electrodes,
the step of correcting the initial threshold value of the rotation speed of the gear-down point engine based on the opening degree of the accelerator pedal and the mechanical parameters to obtain the threshold value of the rotation speed of the gear-down point engine specifically comprises the following steps:
determining a first correction amount for the initial threshold value of the engine speed at the downshift point based on the accelerator pedal opening and the running resistance, and determining a second correction amount for the initial threshold value of the engine speed at the downshift point based on the accelerator pedal opening and the atmospheric pressure;
determining the downshift point engine speed threshold based on the downshift point engine speed initial threshold, the first correction amount, and the second correction amount.
According to the automatic transmission downshift control method provided by the invention, the vehicle working condition information further comprises an accelerator pedal opening, mechanical parameters of the target vehicle, the current vehicle speed and the gear shifting time, wherein the mechanical parameters comprise driving resistance and atmospheric pressure; accordingly, the number of the first and second electrodes,
the method for determining the expected engine speed value and the predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on the vehicle working condition information of the target vehicle specifically comprises the following steps:
determining an initial expected engine speed value of the target vehicle based on the accelerator pedal opening and the running resistance, and correcting the initial expected engine speed value based on the accelerator pedal opening and the atmospheric pressure to obtain the expected engine speed value;
and determining the predicted vehicle speed value based on the current vehicle speed, the running resistance and the gear shifting time.
According to the automatic transmission downshift control method provided by the invention, the determining the desired speed ratio value of the target vehicle after the automatic transmission downshift based on the desired engine speed value and the predicted vehicle speed value specifically comprises:
determining an expected output shaft speed value of the automatic transmission based on the predicted vehicle speed value and a rear axle speed ratio of the target vehicle;
and determining the speed ratio expected value based on the ratio of the engine speed expected value to the output shaft speed expected value.
The present invention also provides an automatic transmission downshift control apparatus including: the control module includes a speed determination module, a desired speed ratio determination module, and a downshift control module. Wherein the content of the first and second substances,
the speed determination module is used for determining an expected engine speed value and a predicted vehicle speed value of a target vehicle after the automatic transmission is downshifted based on vehicle working condition information of the target vehicle if the automatic transmission of the target vehicle meets a downshift condition is judged and obtained;
the expected speed ratio value determining module is used for determining the expected speed ratio value of the target vehicle after the automatic transmission is downshifted based on the expected engine speed value and the predicted vehicle speed value;
and the downshift control module is used for determining a target gear corresponding to the expected value of the speed ratio based on the corresponding relation between the speed ratio and the gear of the automatic transmission and performing downshift control on the automatic transmission based on the target gear.
The present invention also provides a work machine comprising: an automatic transmission;
the automatic transmission performs downshift control based on the automatic transmission downshift control method described above.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the automatic transmission downshift control method according to any one of the above aspects when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the automatic transmission downshift control method according to any one of the above-described methods.
The invention provides a method, a device and a working machine for controlling the downshift of an automatic transmission, wherein the method comprises the steps of determining an expected engine speed value and a predicted vehicle speed value of a target vehicle after the downshift of the automatic transmission according to vehicle working condition information of the target vehicle when the automatic transmission of the target vehicle meets the downshift condition; then, determining the speed ratio expected value of the target vehicle after the automatic transmission is downshifted according to the engine speed expected value and the vehicle speed predicted value; and finally, determining a target gear corresponding to the expected speed ratio value according to the corresponding relation between the speed ratio and the gear of the automatic transmission, and performing downshift control on the automatic transmission based on the target gear. The method does not need to judge and distinguish the gear-down number modes in advance, so that the gear-down number modes do not need to be analyzed and judged one by one, the calculated amount and the calibration workload are reduced, and the calculating speed is improved; the number of downshifts is not limited, the target gear can be calculated in one step, and the method is suitable for downshifting control of mechanical automatic transmissions with different gear numbers and gear ratios, in particular to a multi-gear mechanical automatic transmission of a heavy vehicle; the method has high flexibility and can meet various requirements of grade-crossing downshift.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of an automatic transmission downshift control method provided by the present invention;
FIG. 2 is a schematic flow chart illustrating a complete process for controlling a downshift in an automatic transmission according to the present invention;
FIG. 3 is a schematic structural diagram of an automatic transmission downshift control apparatus provided by the present invention;
FIG. 4 is a schematic illustration of a work machine according to the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
In the prior art, when the automatic transmission is subjected to downshift control, a commonly adopted method needs to perform complex analysis on various working condition parameters and distinguish the requirement of downshift number, and each downshift number mode needs to calibrate the corresponding downshift point vehicle speed in advance, so that the calculated amount is large, the parameter calibration workload is large, the level of the engine speed after downshift is difficult to ensure, and if the engine speed after downshift is too low, the vehicle power is possibly insufficient. Furthermore, it may be necessary to increase the expected engine speed for a downshift situation, which is not flexible and computationally expensive to cope with the downshift requirement of a multi-gear automatic transmission.
Fig. 1 is a schematic flow chart of a downshift control method of an automatic transmission provided in an embodiment of the present invention, as shown in fig. 1, the method including:
s1, if the automatic transmission of the target vehicle meets the downshift condition is judged and known, determining the expected engine speed value and the predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on the vehicle working condition information of the target vehicle;
s2, determining the expected speed ratio value of the target vehicle after the automatic transmission is downshifted based on the expected engine speed value and the predicted vehicle speed value;
and S3, determining a target gear corresponding to the expected value of the speed ratio based on the corresponding relation between the speed ratio and the gear of the automatic transmission, and performing downshift control on the automatic transmission based on the target gear.
Specifically, in the automatic transmission downshift control method provided in the embodiment of the present invention, the execution subject is an automatic transmission downshift control device that can be disposed in a working machine to implement downshift control of an automatic transmission in the working machine.
Step S1 is executed first, before determining whether the automatic transmission of the target vehicle satisfies the downshift condition, and determining whether the automatic transmission satisfies the downshift condition may be equivalent to determining whether the engine speed of the target vehicle is less than or equal to a downshift point engine speed threshold, where the downshift point engine speed threshold may be set as needed, which is not specifically limited in the embodiment of the present invention.
And under the condition that the automatic transmission meets the downshift condition, determining the expected engine speed value and the predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted according to the vehicle working condition information of the target vehicle. The vehicle condition information of the target vehicle may include an engine speed, a current gear, an accelerator pedal opening, a current vehicle speed, a gear shifting time of the target vehicle, and mechanical parameters of the target vehicle, and the mechanical parameters may include a driving resistance and an atmospheric pressure of the target vehicle. The expected engine speed value is the engine speed value which is required to be achieved by the target vehicle after the automatic transmission is downshifted, and can be determined by the opening degree of an accelerator pedal and combining with mechanical parameters such as running resistance and atmospheric pressure. The predicted vehicle speed value is a vehicle speed value which is required to be reached by a target vehicle after the automatic transmission is downshifted, and can be determined through the current vehicle speed, the running resistance and the gear shifting time.
Then, step S2 is executed to determine a desired gear ratio of the target vehicle after the downshift of the automatic transmission, the desired gear ratio being a ratio of the engine speed to the output shaft speed of the automatic transmission, and the desired gear ratio being a ratio of the desired engine speed to the desired output shaft speed of the automatic transmission after the downshift of the automatic transmission, based on the desired engine speed and the predicted vehicle speed. The expected value of the output shaft speed of the automatic transmission can be determined by combining the predicted value of the vehicle speed with the rear axle speed ratio of the target vehicle, which is not particularly limited in the embodiment of the present invention.
And finally, step S3 is executed, and the target gear corresponding to the expected speed ratio is determined according to the corresponding relation between the speed ratio and the automatic transmission gear. The correspondence relationship of the speed ratio to the automatic transmission shift position is predetermined and can be represented by a table of the speed ratio to the automatic transmission shift position. As shown in table 1, the automatic transmission gear is denoted by d, and there are 12 gears, each corresponding to a speed ratio, denoted by x.
TABLE 1 relationship of speed ratio and automatic transmission gear
| d | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| x | 1 | 1.28 | 1.64 | 2.11 | 2.72 | 3.45 | 4.44 | 5.68 | 7.27 | 9.31 | 11.92 | 15.26 |
Fitting is performed with x in table 1 as the independent variable and d as the dependent variable to obtain the continuous relationship between the dependent variable and the independent variable. Further, the corresponding shift position is determined from the continuous relationship based on the expected speed ratio value. If the gear is an integer, the gear can be directly used as a target gear; if the gear is a decimal gear, the gear can be rounded, and the rounded gear is used as the target gear. The rounding mode may be a rounding mode, or a rounding mode, and the like, and this is not particularly limited in the embodiment of the present invention. In the embodiment of the invention, the target gear can be obtained by preferably taking down the gear corresponding to the expected speed ratio value determined from the continuous relation in a rounding-down mode, the rotating speed of the engine after the automatic transmission is downshifted can be ensured to be more than or equal to the expected rotating speed value of the engine, the condition that the rotating speed of the engine is too low due to the fact that the downshift is not timely is avoided, and the dynamic performance of the target vehicle is ensured.
After the target gear is determined, if the target gear is smaller than the current gear, downshift control can be performed on the automatic transmission according to the target gear, that is, a control instruction can be generated according to the target gear, and the control instruction is sent to the automatic transmission, so that the automatic transmission automatically downshifts to the target gear according to the control instruction.
According to the automatic transmission downshift control method provided by the embodiment of the invention, when the automatic transmission of a target vehicle meets the downshift condition, the expected engine speed value and the predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted are determined according to the vehicle working condition information of the target vehicle; then, determining the speed ratio expected value of the target vehicle after the automatic transmission is downshifted according to the engine speed expected value and the vehicle speed predicted value; and finally, determining a target gear corresponding to the expected speed ratio value according to the corresponding relation between the speed ratio and the gear of the automatic transmission, and performing downshift control on the automatic transmission based on the target gear. The method does not need to judge and distinguish the gear-down number modes in advance, so that the gear-down number modes do not need to be analyzed and judged one by one, the calculated amount and the calibration workload are reduced, and the calculating speed is improved; the number of downshifts is not limited, the target gear can be calculated in one step, and the method is suitable for downshifting control of mechanical automatic transmissions with different gear numbers and gear ratios, in particular to a multi-gear mechanical automatic transmission of a heavy vehicle; the method has high flexibility and can meet various requirements of grade-crossing downshift.
On the basis of the foregoing embodiment, the automatic transmission downshift control method according to an embodiment of the present invention, where the determining, based on vehicle condition information of a target vehicle, an expected engine speed value and a predicted vehicle speed value of the target vehicle after the automatic transmission downshift, further includes:
acquiring vehicle working condition information of the target vehicle, wherein the vehicle working condition information comprises the rotating speed of an engine;
and comparing the engine speed with a downshift point engine speed threshold, and determining that the automatic transmission meets a downshift condition if the engine speed is judged to be less than or equal to the downshift point engine speed threshold.
Specifically, in the embodiment of the present invention, before determining the expected engine speed value and the predicted vehicle speed value, it is further required to determine whether the automatic transmission meets the downshift condition, and vehicle condition information of the target vehicle may be first obtained, where the vehicle condition information may include the engine speed. And then judging the magnitude of the engine rotating speed and the rotating speed threshold value of the engine at the gear-down point, and when the engine rotating speed is less than or equal to the rotating speed threshold value of the engine at the gear-down point, enabling the automatic transmission to meet the gear-down condition. The engine speed threshold at the downshift point may be set as needed, or may be calculated according to other information, such as the current gear, the accelerator pedal opening, and the mechanical parameter of the target vehicle, included in the vehicle condition information.
In the embodiment of the invention, whether the automatic transmission meets the downshift condition is judged by judging the rotating speed of the engine and the threshold value of the rotating speed of the engine at the downshift point, so that the follow-up calculation is carried out under the condition that the automatic transmission can downshift, and the waste of calculation resources is avoided.
On the basis of the above embodiment, in the automatic transmission downshift control method provided in the embodiment of the present invention, the vehicle condition information further includes a current gear, an accelerator pedal opening degree, and mechanical parameters of the target vehicle; accordingly, the number of the first and second electrodes,
the downshift point engine speed threshold is determined based on the following method:
calculating an initial threshold value of the rotating speed of the engine at the gear reduction point based on the current gear and the opening degree of the accelerator pedal;
and correcting the initial threshold value of the rotating speed of the gear-down point engine based on the opening degree of the accelerator pedal and the mechanical parameters to obtain the threshold value of the rotating speed of the gear-down point engine.
Specifically, the vehicle condition information in the embodiment of the present invention may further include a current gear, an accelerator pedal opening, and a mechanical parameter of the target vehicle, where the current gear may be a current gear of the automatic transmission, and the accelerator pedal opening may be a value output by a sensor on the accelerator pedal according to a stroke of the driver for stepping on the accelerator pedal, and the value is between 0% and 100%. The mechanical parameters of the target vehicle may be the running resistance and the atmospheric pressure, etc. to which the target vehicle is subjected. Therefore, when the rotation speed threshold of the downshift point engine is determined, the rotation speed initial threshold of the downshift point engine can be calculated according to the current gear and the opening degree of the accelerator pedal.
In the embodiment of the invention, a two-dimensional table between the current gear and the opening degree of the accelerator pedal and the rotation speed threshold of the gear-down point engine, which is determined in advance, can be used for searching the rotation speed threshold of the gear-down point engine corresponding to the current gear and the opening degree of the accelerator pedal in the two-dimensional table to be used as the initial rotation speed threshold of the gear-down point engine. The unit of the initial threshold value of the rotating speed of the gear-down point engine is rpm, and in the normal condition, the larger the opening degree of an accelerator pedal or the larger the current gear, the larger the initial threshold value of the rotating speed of the gear-down point engine is, so that the dynamic performance of the vehicle is improved.
And then, correcting the initial rotating speed threshold value of the downshift point engine according to the opening degree of the accelerator pedal and the mechanical parameters to obtain the corrected initial rotating speed threshold value of the downshift point engine, namely the final rotating speed threshold value of the downshift point engine.
In the embodiment of the invention, the initial threshold value of the rotating speed of the gear-down point engine is corrected through the opening degree of the accelerator pedal and the mechanical parameters to obtain the threshold value of the rotating speed of the gear-down point engine, so that the obtained threshold value of the rotating speed of the gear-down point engine is more accurate.
On the basis of the above embodiment, in the automatic transmission downshift control method provided in the embodiment of the invention, the mechanical parameters include the running resistance and the atmospheric pressure; accordingly, the number of the first and second electrodes,
the step of correcting the initial threshold value of the rotation speed of the gear-down point engine based on the opening degree of the accelerator pedal and the mechanical parameters to obtain the threshold value of the rotation speed of the gear-down point engine specifically comprises the following steps:
determining a first correction amount for the initial threshold value of the engine speed at the downshift point based on the accelerator pedal opening and the running resistance, and determining a second correction amount for the initial threshold value of the engine speed at the downshift point based on the accelerator pedal opening and the atmospheric pressure;
determining the downshift point engine speed threshold based on the downshift point engine speed initial threshold, the first correction amount, and the second correction amount.
Specifically, when the initial threshold value of the engine speed at the downshift point is corrected, a first correction amount for the initial threshold value of the engine speed at the downshift point may be determined first based on the accelerator pedal opening and the running resistance. The correction amount corresponding to the accelerator pedal opening degree and the running resistance may be found in the two-dimensional table as the first correction amount using a two-dimensional table between the accelerator pedal opening degree and the running resistance and the correction amount determined in advance. The unit of the first correction amount is rpm, and in general, the larger the running resistance, the larger the first correction amount.
Then, a second correction amount for the initial threshold value of the engine speed at the downshift point is determined based on the accelerator pedal opening and the atmospheric pressure. The correction amount corresponding to the accelerator pedal opening degree and the atmospheric pressure may be found in the two-dimensional table as the second correction amount using a two-dimensional table between the accelerator pedal opening degree and the atmospheric pressure, which are determined in advance, and the correction amount. The unit of the second correction amount is rpm, and in general, the lower the atmospheric pressure is, the larger the second correction amount is.
And finally, determining the rotating speed threshold of the engine at the gear shifting point according to the initial rotating speed threshold of the engine at the gear shifting point, the first correction and the second correction. Namely, the method comprises the following steps:
Nbfo＝Nbase_bfo+Nres_bfo+Nbaro_bfo
wherein N isbfoRepresenting the rotating speed threshold value of the engine at the gear shifting point, and the unit rpm; n is a radical ofbase_bfoRepresenting an initial threshold value of the rotating speed of the engine at the gear shifting point, namely unit rpm; n is a radical ofres_bfoRepresents a first correction amount in rpm; n is a radical ofbaro_bfoRepresents the second correction in rpm.
In the embodiment of the present invention, the first correction amount and the second correction amount for the downshift point engine rotation speed initial threshold value are determined by the running resistance and the atmospheric pressure, respectively, and the downshift point engine rotation speed threshold value can be determined more accurately based on the downshift point engine rotation speed initial threshold value, the first correction amount, and the second correction amount.
On the basis of the above embodiment, in the automatic transmission downshift control method provided in the embodiment of the present invention, the vehicle condition information further includes an accelerator pedal opening, mechanical parameters of the target vehicle, a current vehicle speed, and shift time, and the mechanical parameters include a driving resistance and an atmospheric pressure; accordingly, the number of the first and second electrodes,
the method for determining the expected engine speed value and the predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on the vehicle working condition information of the target vehicle specifically comprises the following steps:
determining an initial expected engine speed value of the target vehicle based on the accelerator pedal opening and the running resistance, and correcting the initial expected engine speed value based on the accelerator pedal opening and the atmospheric pressure to obtain the expected engine speed value;
and determining the predicted vehicle speed value based on the current vehicle speed, the running resistance and the gear shifting time.
Specifically, in the embodiment of the present invention, when determining the expected engine speed value of the target vehicle after the downshift of the automatic transmission, the initial expected engine speed value of the target vehicle may be determined according to the accelerator pedal opening and the running resistance. The engine speed corresponding to the accelerator pedal opening and the running resistance may be found in the two-dimensional table as the initial expected engine speed value using the two-dimensional table between the predetermined accelerator pedal opening and running resistance and the engine speed. The unit of the initial expected value of the engine speed is rpm, and in general, the larger the opening degree of an accelerator pedal or the larger the running resistance, the larger the initial expected value of the engine speed is, so as to improve the power performance of the target vehicle.
And then correcting the initial expected value of the engine speed according to the opening degree of the accelerator pedal and the atmospheric pressure to obtain the expected value of the engine speed. The correction amount corresponding to the accelerator pedal opening and the atmospheric pressure may be found in the two-dimensional table as a third correction amount by using a predetermined two-dimensional table between the accelerator pedal opening and the atmospheric pressure and the correction amount, and the third correction amount may be added to the initial expected engine speed value to obtain the expected engine speed value. Namely, the method comprises the following steps:
Naft＝Nbase_aft+Nbaro_aft
wherein N isaftRepresenting the desired engine speed in rpm; n is a radical ofbase_aftRepresenting an initial desired value of engine speed in rpm; n is a radical ofbaro_aftThe third correction is expressed in rpm. In general, the lower the atmospheric pressure, the lower Nbaro_aftThe larger.
And finally, determining a predicted value of the vehicle speed according to the current vehicle speed, the driving resistance and the gear shifting time, acquiring the quality of a target vehicle, and determining the predicted value of the vehicle speed by combining a variable speed motion formula in the downshift process of the automatic transmission. Namely, the method comprises the following steps:
wherein, VaftRepresenting a predicted value of the vehicle speed, wherein the unit is m/s; vcurrThe current vehicle speed is represented in m/s, and CAN be obtained by measuring and calculating an output shaft rotating speed sensor of the automatic transmission or obtaining a vehicle speed value signal sent by an ABS module from a CAN bus; fresThe unit of the running resistance of the target vehicle is N, and the running resistance can be calculated by special resistance measurement software; m represents the mass of the target vehicle, the unit is kg, and the mass can be calculated by special mass measurement software; t issThe power off time, i.e. the shift time, which represents the shift process, in units of s, can be calibrated based on the elapsed time of the actual downshift process.
According to the embodiment of the invention, the initial expected value of the engine speed of the target vehicle is determined and corrected according to the vehicle working condition information of the target vehicle to obtain the expected value of the engine speed, and the predicted value of the vehicle speed is determined according to the current vehicle speed, the running resistance and the gear shifting time so as to calculate the expected value of the speed ratio of the target vehicle in the follow-up process.
On the basis of the foregoing embodiment, the method for controlling a downshift of an automatic transmission according to an embodiment of the present invention, where the determining a desired gear ratio value of the target vehicle based on the desired engine speed value and the predicted vehicle speed value includes:
determining an expected output shaft speed value of the automatic transmission based on the predicted vehicle speed value and a rear axle speed ratio of the target vehicle;
and determining the speed ratio expected value of the target vehicle based on the ratio of the engine speed expected value to the output shaft speed expected value.
Specifically, in the embodiment of the present invention, when determining the expected speed ratio value of the target vehicle, the expected output shaft speed value of the automatic transmission may be determined according to the predicted vehicle speed value and the rear axle speed ratio of the target vehicle, that is, the following steps are performed:
wherein N is0The expected value of the output shaft speed of the automatic transmission is obtained; vaftThe unit is m/s, which is a predicted value of the vehicle speed; r is the wheel radius of the target vehicle, and the unit is m; r isaxleIs the rear axle speed ratio of the target vehicle and is a dimensionless constant.
And then determining the speed ratio expected value of the target vehicle according to the ratio of the engine speed expected value to the output shaft speed expected value. In the embodiment of the invention, the ratio can be directly used as the speed ratio expected value of the target vehicle. Namely, the method comprises the following steps:
wherein r isdesThe expected value of the speed ratio of the target vehicle is a dimensionless constant; n is a radical ofaftIs the desired engine speed in rpm.
Fig. 2 is a complete flow chart of a downshift control method of an automatic transmission provided in an embodiment of the present invention, as shown in fig. 2, the method including:
1) calculating a rotating speed threshold value of an engine at a gear reduction point;
2) judging whether the engine speed is less than or equal to a gear-down point engine speed threshold, if so, executing 3), and if not, returning to execute 1);
3) calculating the expected value of the engine speed after the downshift;
4) calculating a predicted value of the vehicle speed after the downshift;
5) calculating a predicted value of the speed ratio;
6) and outputting the target gear.
Fig. 3 is a downshift control apparatus for an automatic transmission provided in an embodiment of the present invention, including: a speed determination module 31, a desired speed ratio determination module 32, and a downshift control module 33. Wherein the content of the first and second substances,
the speed determination module 31 is configured to determine an expected engine speed value and a predicted vehicle speed value of a target vehicle after downshift of an automatic transmission based on vehicle condition information of the target vehicle if it is determined that the automatic transmission of the target vehicle meets a downshift condition;
the expected speed ratio value determining module 32 is used for determining the expected speed ratio value of the target vehicle after the automatic transmission is downshifted based on the expected engine speed value and the predicted vehicle speed value;
the downshift control module 33 is configured to determine a target gear corresponding to the expected speed ratio value based on a correspondence between the speed ratio and a gear position of the automatic transmission, and perform downshift control on the automatic transmission based on the target gear position.
In addition to the above embodiments, an automatic transmission downshift control apparatus provided in an embodiment of the present invention further includes:
the acquisition module is used for acquiring vehicle working condition information of the target vehicle, wherein the vehicle working condition information comprises the rotating speed of an engine;
and the comparison module is used for comparing the engine rotating speed with a gear-down point engine rotating speed threshold value, and if the engine rotating speed is judged to be less than or equal to the gear-down point engine rotating speed threshold value, determining that the automatic transmission meets the gear-down condition.
On the basis of the above embodiment, in the automatic transmission downshift control device provided in the embodiment of the present invention, the vehicle condition information further includes a current gear, an accelerator pedal opening degree, and mechanical parameters of the target vehicle; correspondingly, the method further comprises the following steps: a threshold determination module;
the threshold determination module comprises:
the initial threshold value determining submodule is used for calculating an initial threshold value of the rotating speed of the engine at the gear reduction point based on the current gear and the opening degree of the accelerator pedal;
and the threshold value determining submodule is used for correcting the initial threshold value of the rotating speed of the gear-down point engine based on the opening degree of the accelerator pedal and the mechanical parameters to obtain the threshold value of the rotating speed of the gear-down point engine.
On the basis of the above embodiment, the automatic transmission downshift control apparatus provided in the embodiment of the invention, the mechanical parameters include a running resistance and an atmospheric pressure; accordingly, the number of the first and second electrodes,
the threshold determination sub-module specifically includes:
a threshold value correction unit configured to determine a first correction amount for the downshift point engine speed initial threshold value based on the accelerator pedal opening degree and the running resistance, and determine a second correction amount for the downshift point engine speed initial threshold value based on the accelerator pedal opening degree and the atmospheric pressure;
a threshold determination unit configured to determine the downshift point engine speed threshold based on the downshift point engine speed initial threshold, the first correction amount, and the second correction amount.
On the basis of the above embodiment, the downshift control device of the automatic transmission provided in the embodiment of the present invention further includes vehicle condition information, where the vehicle condition information further includes an accelerator pedal opening, mechanical parameters of the target vehicle, a current vehicle speed, and shift time, and the mechanical parameters include a driving resistance and an atmospheric pressure; correspondingly, the speed determination module specifically includes:
the engine rotating speed expected value determining submodule is used for determining an engine rotating speed initial expected value of the target vehicle based on the opening degree of the accelerator pedal and the running resistance, and correcting the engine rotating speed initial expected value based on the opening degree of the accelerator pedal and the atmospheric pressure to obtain the engine rotating speed expected value;
and the vehicle speed prediction submodule is used for determining the predicted vehicle speed value based on the current vehicle speed, the running resistance and the gear shifting time.
On the basis of the foregoing embodiment, in the automatic transmission downshift control apparatus provided in the embodiment of the present invention, the expected speed ratio value determining module specifically includes:
an output shaft rotating speed expected value determining submodule, which is used for determining the output shaft rotating speed expected value of the automatic transmission based on the vehicle speed predicted value and the rear axle speed ratio of the target vehicle;
and the expected speed ratio value determining submodule is used for determining the expected speed ratio value based on the ratio of the expected engine speed value to the expected output shaft speed value.
Fig. 4 is a schematic structural diagram of a working machine according to an embodiment of the present invention, and as shown in fig. 4, the working machine 41 includes: and an automatic transmission 42, the automatic transmission 42 performing downshift control based on the automatic transmission downshift control method according to each of the embodiments described above.
Fig. 5 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 5: a processor (processor)510, a communication Interface (Communications Interface)520, a memory (memory)530 and a communication bus 540, wherein the processor 510, the communication Interface 520 and the memory 530 communicate with each other via the communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform the automatic transmission downshift control method provided in the various embodiments described above, the method comprising: if the fact that the automatic transmission of the target vehicle meets the downshift condition is judged and obtained, determining an expected engine speed value and a predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on vehicle working condition information of the target vehicle; determining a speed ratio expected value of the target vehicle after the automatic transmission is downshifted based on the engine speed expected value and the vehicle speed predicted value; and determining a target gear corresponding to the expected speed ratio value based on the corresponding relation between the speed ratio and the automatic transmission gear, and performing downshift control on the automatic transmission based on the target gear.
Furthermore, the logic instructions in the memory 530 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. 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.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method of automatic transmission downshift control provided in the above embodiments, the method comprising: if the fact that the automatic transmission of the target vehicle meets the downshift condition is judged and obtained, determining an expected engine speed value and a predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on vehicle working condition information of the target vehicle; determining a speed ratio expected value of the target vehicle after the automatic transmission is downshifted based on the engine speed expected value and the vehicle speed predicted value; and determining a target gear corresponding to the expected speed ratio value based on the corresponding relation between the speed ratio and the automatic transmission gear, and performing downshift control on the automatic transmission based on the target gear.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the method of automatic transmission downshift control provided in the above embodiments, the method comprising: if the fact that the automatic transmission of the target vehicle meets the downshift condition is judged and obtained, determining an expected engine speed value and a predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on vehicle working condition information of the target vehicle; determining a speed ratio expected value of the target vehicle after the automatic transmission is downshifted based on the engine speed expected value and the vehicle speed predicted value; and determining a target gear corresponding to the expected speed ratio value based on the corresponding relation between the speed ratio and the automatic transmission gear, and performing downshift control on the automatic transmission based on the target gear.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network 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.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A downshift control method for an automatic transmission, characterized by comprising:
if the fact that the automatic transmission of the target vehicle meets the downshift condition is judged and obtained, determining an expected engine speed value and a predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on vehicle working condition information of the target vehicle;
determining a speed ratio expected value of the target vehicle after the automatic transmission is downshifted based on the engine speed expected value and the vehicle speed predicted value;
and determining a target gear corresponding to the expected speed ratio value based on the corresponding relation between the speed ratio and the automatic transmission gear, and performing downshift control on the automatic transmission based on the target gear.
2. The automatic transmission downshift control method according to claim 1, wherein the determining of the desired engine speed value and the predicted vehicle speed value of the target vehicle after the automatic transmission downshift based on vehicle condition information of the target vehicle further includes:
acquiring vehicle working condition information of the target vehicle, wherein the vehicle working condition information comprises the rotating speed of an engine;
and comparing the engine speed with a downshift point engine speed threshold, and determining that the automatic transmission meets a downshift condition if the engine speed is judged to be less than or equal to the downshift point engine speed threshold.
3. The automatic transmission downshift control method according to claim 2, wherein the vehicle condition information further includes a current gear, an accelerator pedal opening degree, and mechanical parameters of the target vehicle; accordingly, the number of the first and second electrodes,
the downshift point engine speed threshold is determined based on the following method:
calculating an initial threshold value of the rotating speed of the engine at the gear reduction point based on the current gear and the opening degree of the accelerator pedal;
and correcting the initial threshold value of the rotating speed of the gear-down point engine based on the opening degree of the accelerator pedal and the mechanical parameters to obtain the threshold value of the rotating speed of the gear-down point engine.
4. The automatic transmission downshift control method according to claim 3, wherein the mechanical parameters include a running resistance and an atmospheric pressure; accordingly, the number of the first and second electrodes,
the step of correcting the initial threshold value of the rotation speed of the gear-down point engine based on the opening degree of the accelerator pedal and the mechanical parameters to obtain the threshold value of the rotation speed of the gear-down point engine specifically comprises the following steps:
determining a first correction amount for the initial threshold value of the engine speed at the downshift point based on the accelerator pedal opening and the running resistance, and determining a second correction amount for the initial threshold value of the engine speed at the downshift point based on the accelerator pedal opening and the atmospheric pressure;
determining the downshift point engine speed threshold based on the downshift point engine speed initial threshold, the first correction amount, and the second correction amount.
5. The automatic transmission downshift control method according to claim 1, wherein the vehicle condition information further includes an accelerator pedal opening, mechanical parameters of the target vehicle including a running resistance and an atmospheric pressure, a current vehicle speed, and a shift time; accordingly, the number of the first and second electrodes,
the method for determining the expected engine speed value and the predicted vehicle speed value of the target vehicle after the automatic transmission is downshifted based on the vehicle working condition information of the target vehicle specifically comprises the following steps:
determining an initial expected engine speed value of the target vehicle based on the accelerator pedal opening and the running resistance, and correcting the initial expected engine speed value based on the accelerator pedal opening and the atmospheric pressure to obtain the expected engine speed value;
and determining the predicted vehicle speed value based on the current vehicle speed, the running resistance and the gear shifting time.
6. The automatic transmission downshift control method according to any one of claims 1 to 5, wherein the determining a desired gear ratio value of the target vehicle after the automatic transmission downshift based on the desired engine speed value and the predicted vehicle speed value specifically includes:
determining an expected output shaft speed value of the automatic transmission based on the predicted vehicle speed value and a rear axle speed ratio of the target vehicle;
and determining the speed ratio expected value based on the ratio of the engine speed expected value to the output shaft speed expected value.
7. An automatic transmission downshift control apparatus characterized by comprising:
the speed determination module is used for determining an expected engine speed value and a predicted vehicle speed value of a target vehicle after the automatic transmission is downshifted based on vehicle working condition information of the target vehicle if the automatic transmission of the target vehicle meets a downshift condition is judged and obtained;
the expected speed ratio value determining module is used for determining the expected speed ratio value of the target vehicle after the automatic transmission is downshifted based on the expected engine speed value and the predicted vehicle speed value;
and the downshift control module is used for determining a target gear corresponding to the expected value of the speed ratio based on the corresponding relation between the speed ratio and the gear of the automatic transmission and performing downshift control on the automatic transmission based on the target gear.
8. A work machine, comprising: an automatic transmission;
the automatic transmission performs downshift control based on the automatic transmission downshift control method according to any one of claims 1 to 6.
9. An electronic device comprising a memory, a processor and a computer program stored on said memory and executable on said processor, characterized in that said processor, when executing said program, carries out the steps of the method of automatic transmission downshift control according to any one of claims 1 to 6.
10. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the steps of the automatic transmission downshift control method according to any one of claims 1 to 6.
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