CN112413117B - Method and device for adjusting synchronous force of shifting fork - Google Patents

Method and device for adjusting synchronous force of shifting fork Download PDF

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Publication number
CN112413117B
CN112413117B CN201910785819.6A CN201910785819A CN112413117B CN 112413117 B CN112413117 B CN 112413117B CN 201910785819 A CN201910785819 A CN 201910785819A CN 112413117 B CN112413117 B CN 112413117B
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force
shifting fork
speed difference
difference ratio
synchronization
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CN112413117A (en
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孙宇航
赵�智
张昌钧
韩秋玲
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/32—Gear shift yokes, e.g. shift forks
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The embodiment of the invention discloses a method and a device for adjusting synchronous force of a shifting fork, wherein when a vehicle carrying DCT is shifted, the following steps are carried out: acquiring a corresponding relation between shifting fork synchronous force and a rotating speed difference ratio which are stored in advance, a rotating speed difference of a driving end and a driven end of a synchronizer at the synchronous starting moment and the current oil temperature; calculating an initial rotation speed difference ratio according to the rotation speed difference and preset target synchronization time, and determining a rotation speed difference ratio interval in which the initial rotation speed difference ratio is in a corresponding relation; calculating the initial shifting fork synchronous force corresponding to the initial rotating speed difference ratio based on an interpolation formula corresponding to the rotating speed difference ratio interval; and determining a correction shifting fork synchronous force based on the current oil temperature, and adjusting the initial shifting fork synchronous force according to the correction shifting fork synchronous force to obtain a target shifting fork synchronous force. Therefore, self-adaptive adjustment of the shifting fork synchronous force is realized, the output target shifting fork synchronous force can cause the shifting fork to move properly, and the problems of gear engaging impact, gear engaging noise, gear engaging failure and the like are effectively avoided.

Description

Method and device for adjusting synchronous force of shifting fork
Technical Field
The invention relates to the technical field of vehicles, in particular to a method and a device for adjusting synchronous force of a shifting fork.
Background
The Dual Clutch Transmission (DCT) combines the advantages of the manual Transmission and the automatic Transmission, overcomes the problem of intermittent output of the traditional manual Transmission during the gear shifting (specifically, the manual Transmission uses a Clutch, and a driver needs to step on a Clutch pedal in the gear shifting process to enable gears of different gears to engage, so that the power is interrupted during the gear shifting process, and the problem of intermittent output is provided), and provides uninterrupted power output. Accordingly, the DCT is currently receiving a wide attention.
Currently, DCTs can be mounted on conventional internal combustion engine vehicles or hybrid vehicles to improve the performance of the vehicle. In the case of the DCT, the shifting process thereof includes a gear engaging process (i.e., a coupling process of the synchronizer) by the piston pushing the fork to move. In the combination process of the synchronizer, the shifting fork needs to overcome resistances such as shifting fork positioning pins, synchronizer sliding blocks, piston friction, reverse piston obstruction, shifting fork clamping stagnation and the like during moving, and appropriate shifting fork synchronizing force needs to be provided during the moving process of the whole shifting fork. Wherein, suitable shift fork synchronizing force means: the problem that gear shifting impact, gear shifting noise and the like are caused by overlarge synchronous force of the shifting fork is prevented, and the problem that gear shifting fails due to the fact that the synchronous force of the shifting fork is too small is avoided.
Therefore, at present, it is urgently needed to provide a self-adaptive adjusting method, which can accurately obtain the proper shifting fork synchronizing force of the DCT in the shifting process, so that the vehicle carrying the DCT avoids the problems of gear engagement impact, gear engagement noise, gear engagement failure and the like.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a method and an apparatus for adjusting a fork synchronization force, so that a vehicle carrying a DCT can adaptively adjust a target fork synchronization force during a gear shifting process, and the output fork synchronization force causes a fork to move properly, thereby effectively avoiding problems of gear engagement impact, gear engagement noise, gear engagement failure, and the like, and improving performance of the vehicle carrying the DCT.
In a first aspect, a method for adjusting a shifting fork synchronizing force is provided, which includes:
in the gear shifting process, acquiring a corresponding relation between pre-stored shifting fork synchronous force and speed difference ratio, the speed difference of a synchronizer driving end and a synchronizer driven end at the synchronous starting moment and the current oil temperature;
calculating an initial rotating speed difference ratio according to the rotating speed difference and preset target synchronization time, and determining a rotating speed difference ratio interval in which the initial rotating speed difference ratio is in the corresponding relation;
calculating the initial shifting fork synchronous force corresponding to the initial rotating speed difference ratio based on the interpolation formula corresponding to the rotating speed difference ratio interval;
and determining a correction shifting fork synchronous force based on the current oil temperature, and adjusting the initial shifting fork synchronous force according to the correction shifting fork synchronous force to obtain a target shifting fork synchronous force.
Optionally, the determining a modified fork synchronizing force based on the current oil temperature includes:
if the current oil temperature is smaller than a preset first oil temperature, determining that the synchronous force of the correction shifting fork is a first value;
if the current oil temperature is not less than the first oil temperature and less than a preset second oil temperature, determining that the synchronous force of the correction shifting fork is obtained according to a first slope interpolation;
if the current oil temperature is not less than the second oil temperature and less than a preset third oil temperature, determining that the correction shifting fork synchronous force is obtained according to a second slope interpolation;
if the current oil temperature is not less than the third oil temperature, determining that the synchronous force of the correction shifting fork is zero;
wherein the first oil temperature is less than the second oil temperature, which is less than the third oil temperature; the first slope is greater than the second slope.
Optionally, the adjusting of the initial shifting fork synchronizing force according to the correction shifting fork synchronizing force obtains a target shifting fork synchronizing force, and includes:
and adding the initial shifting fork synchronous force and the corrected shifting fork synchronous force to obtain a sum, wherein the sum is used as the target shifting fork synchronous force.
Optionally, the method further comprises:
if the target shifting fork synchronous force is smaller than a first shifting fork synchronous force threshold value and the target shifting fork synchronous force is larger than a second shifting fork synchronous force threshold value, outputting the adjusted target shifting fork synchronous force;
if the target shifting fork synchronous force is not smaller than the first shifting fork synchronous force threshold value, outputting the first shifting fork synchronous force threshold value as the target shifting fork synchronous force;
and if the target shifting fork synchronous force is not greater than the second shifting fork synchronous force threshold value, outputting the second shifting fork synchronous force threshold value as the target shifting fork synchronous force.
Optionally, the method further comprises:
determining an updated synchronization force increment according to the difference value between the actual synchronization time and the target synchronization time;
and updating the corresponding relation between the pre-stored shifting fork synchronous force and the rotating speed difference ratio according to the updated synchronous force increment based on the updating formula corresponding to the rotating speed difference ratio interval.
Optionally, the determining an updated synchronization force increment according to a difference between the actual synchronization time and the target synchronization time includes:
if the difference is smaller than a first time threshold, determining the updated synchronous force increment as a first synchronous force increment;
if the difference value is not smaller than the first time threshold and smaller than a second time threshold, determining that the updated synchronous force increment is obtained according to a third slope interpolation;
if the difference value is not smaller than the second time threshold and smaller than a third time threshold, determining the updated synchronization force increment to be a second synchronization force increment;
if the difference value is not smaller than the third time threshold and smaller than a fourth time threshold, determining the updated synchronization force increment to be a third synchronization force increment;
if the difference value is not smaller than the fourth time threshold and smaller than a fifth time threshold, determining that the updated synchronous force increment is obtained according to a fourth slope interpolation;
if the difference is not smaller than the fifth time threshold, determining that the updated synchronization force increment is a fourth synchronization force increment;
wherein the first synchronization force increment is greater than the second synchronization force increment; the second synchronization force increment is greater than zero; zero is greater than the third synchronizing force increment, which is greater than the fourth synchronizing force increment.
Optionally, the updating the pre-stored corresponding relationship between the shifting fork synchronization force and the differential rotation speed ratio according to the updated synchronization force increment based on the updated formula corresponding to the differential rotation speed ratio interval includes:
if the speed difference ratio interval is from a first speed difference ratio to a second speed difference ratio, or from zero to the first speed difference ratio, determining the first updating formula; wherein the first rotational speed difference ratio is smaller than the second rotational speed difference ratio;
substituting the updated synchronous force increment, the initial speed difference ratio, the first speed difference ratio, the second speed difference ratio, a first shifting fork synchronous force corresponding to the first speed difference ratio and a second shifting fork synchronous force corresponding to the second speed difference ratio into the first updating formula to obtain a third shifting fork synchronous force corresponding to the first speed difference ratio and a fourth shifting fork synchronous force corresponding to the second speed difference ratio;
and updating the first shifting fork synchronous force and the second shifting fork synchronous force by using the third shifting fork synchronous force and the fourth shifting fork synchronous force respectively, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
Optionally, the updating the pre-stored corresponding relationship between the shifting fork synchronization force and the differential rotation speed ratio according to the updated synchronization force increment based on the updated formula corresponding to the differential rotation speed ratio interval includes:
if the rotating speed difference ratio interval is from a second rotating speed difference ratio to a third rotating speed difference ratio, or is larger than the third rotating speed difference ratio, determining the second updating formula; wherein the second rotational speed difference ratio is smaller than the third rotational speed difference ratio;
substituting the updated synchronization force increment, the initial speed difference ratio, the second speed difference ratio, the third speed difference ratio, a second shifting fork synchronization force corresponding to the second speed difference ratio and a fifth shifting fork synchronization force corresponding to the third speed difference ratio into a second updating formula to obtain a sixth shifting fork synchronization force corresponding to the second speed difference ratio and a seventh shifting fork synchronization force corresponding to the third speed difference ratio;
and updating the second shifting fork synchronous force and the fifth shifting fork synchronous force by using the sixth shifting fork synchronous force and the seventh shifting fork synchronous force respectively, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
In a second aspect, a device for adjusting a synchronous force of a shifting fork is further provided, which includes:
the acquiring unit is used for acquiring the corresponding relation between the shifting fork synchronizing force and the rotating speed difference ratio which are stored in advance, the rotating speed difference of a driving end and a driven end of the synchronizer at the synchronizing starting moment and the current oil temperature in the gear shifting process;
the first calculating unit is used for calculating an initial rotating speed difference ratio according to the rotating speed difference and preset target synchronization time and determining a rotating speed difference ratio interval of which the initial rotating speed difference ratio is in the corresponding relation;
the second calculation unit is used for calculating the initial shifting fork synchronous force corresponding to the initial rotating speed difference ratio based on an interpolation formula corresponding to the rotating speed difference ratio interval;
a first determination unit for determining a correction fork synchronization force based on the current oil temperature;
and the adjusting unit is used for adjusting the initial shifting fork synchronous force according to the corrected shifting fork synchronous force to obtain the target shifting fork synchronous force.
Optionally, the first determining unit includes:
the first determining subunit is used for determining that the synchronous force of the correction shifting fork is a first value if the current oil temperature is less than a preset first oil temperature;
the second determining subunit is used for determining that the correction shifting fork synchronous force is obtained according to a first slope interpolation value if the current oil temperature is not less than the first oil temperature and is less than a preset second oil temperature;
the third determining subunit is used for determining that the correction shifting fork synchronous force is obtained according to a second slope interpolation value if the current oil temperature is not less than the second oil temperature and is less than a preset third oil temperature;
the fourth determining subunit is used for determining that the synchronous force of the correction shifting fork is zero if the current oil temperature is not less than the third oil temperature;
wherein the first oil temperature is less than the second oil temperature, which is less than the third oil temperature; the first slope is greater than the second slope.
Optionally, the adjusting unit is specifically configured to:
and adding the initial shifting fork synchronous force and the corrected shifting fork synchronous force to obtain a sum, wherein the sum is used as the target shifting fork synchronous force.
Optionally, the apparatus further comprises:
the first output unit is used for outputting the adjusted target shifting fork synchronous force if the target shifting fork synchronous force is smaller than a first shifting fork synchronous force threshold value and the target shifting fork synchronous force is larger than a second shifting fork synchronous force threshold value;
the second output unit is used for outputting the first shifting fork synchronous force threshold value as the target shifting fork synchronous force if the target shifting fork synchronous force is not smaller than the first shifting fork synchronous force threshold value;
and the third output unit is used for outputting the second shifting fork synchronous force threshold value as the target shifting fork synchronous force if the target shifting fork synchronous force is not greater than the second shifting fork synchronous force threshold value.
Optionally, the apparatus further comprises:
the second determining unit is used for determining an updating synchronous force increment according to the difference value between the actual synchronous time and the target synchronous time;
and the updating unit is used for updating the corresponding relation between the pre-stored shifting fork synchronous force and the rotating speed difference ratio according to the updated synchronous force increment based on the updating formula corresponding to the rotating speed difference ratio interval.
Optionally, the second determining unit includes:
a fifth determining subunit, configured to determine, if the difference is smaller than a first time threshold, that the updated synchronization force increment is a first synchronization force increment;
a sixth determining subunit, configured to determine, if the difference is not smaller than the first time threshold and smaller than a second time threshold, that the updated synchronization force increment is obtained according to a third slope interpolation;
a seventh determining subunit, configured to determine, if the difference is not smaller than the second time threshold and smaller than a third time threshold, that the updated synchronization force increment is a second synchronization force increment;
an eighth determining subunit, configured to determine that the updated synchronization force increment is a third synchronization force increment if the difference is not smaller than the third time threshold and smaller than a fourth time threshold;
a ninth determining subunit, configured to determine that the updated synchronization force increment is obtained according to a fourth slope interpolation if the difference is not smaller than the fourth time threshold and smaller than a fifth time threshold;
a tenth determining subunit, configured to determine, if the difference is not smaller than the fifth time threshold, that the updated synchronization force increment is a fourth synchronization force increment;
wherein the first synchronization force increment is greater than the second synchronization force increment; the second synchronization force increment is greater than zero; zero is greater than the third synchronizing force increment, which is greater than the fourth synchronizing force increment.
Optionally, the update unit includes:
an eleventh determining subunit, configured to determine the first update formula if the speed difference ratio interval is from a first speed difference ratio to a second speed difference ratio, or from zero to the first speed difference ratio; wherein the first rotational speed difference ratio is smaller than the second rotational speed difference ratio;
a first calculating subunit, configured to substitute the updated synchronization force increment, the initial speed difference ratio, the first speed difference ratio, the second speed difference ratio, a first fork synchronization force corresponding to the first speed difference ratio, and a second fork synchronization force corresponding to the second speed difference ratio into the first update formula, so as to obtain a third fork synchronization force corresponding to the first speed difference ratio and a fourth fork synchronization force corresponding to the second speed difference ratio;
and the first updating and storing subunit is used for respectively updating the first shifting fork synchronous force and the second shifting fork synchronous force by using the third shifting fork synchronous force and the fourth shifting fork synchronous force, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
Optionally, the update unit includes:
a twelfth determining subunit, configured to determine the second update formula if the speed difference ratio interval is from a second speed difference ratio to a third speed difference ratio, or is greater than the third speed difference ratio; wherein the second rotational speed difference ratio is smaller than the third rotational speed difference ratio;
a second calculating subunit, configured to substitute the updated synchronization force increment, the initial rotation speed difference ratio, the second rotation speed difference ratio, the third rotation speed difference ratio, a second shifting fork synchronization force corresponding to the second rotation speed difference ratio, and a fifth shifting fork synchronization force corresponding to the third rotation speed difference ratio into the second update formula, so as to obtain a sixth shifting fork synchronization force corresponding to the second rotation speed difference ratio and a seventh shifting fork synchronization force corresponding to the third rotation speed difference ratio;
and the second updating and storing subunit is used for respectively updating the second shifting fork synchronous force and the fifth shifting fork synchronous force by using the sixth shifting fork synchronous force and the seventh shifting fork synchronous force, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
In an embodiment of the present invention, there is provided a method for adjusting a fork synchronization force, which can adjust the fork synchronization force according to the following steps if a gear shift occurs in a vehicle equipped with a DCT: firstly, acquiring a corresponding relation between a shifting fork synchronizing force and a rotating speed difference ratio which are stored in advance, a rotating speed difference of a driving end and a driven end of a synchronizer at the synchronization starting moment and the current oil temperature; then, calculating an initial speed difference ratio according to the speed difference and preset target synchronization time, and determining a speed difference ratio interval in which the initial speed difference ratio is in the corresponding relation; then, based on the interpolation formula corresponding to the rotating speed difference ratio interval, calculating the initial shifting fork synchronous force corresponding to the initial rotating speed difference ratio; and finally, determining a correction shifting fork synchronous force based on the current oil temperature, and adjusting the initial shifting fork synchronous force according to the correction shifting fork synchronous force to obtain a target shifting fork synchronous force. Therefore, the adjusting method provided by the embodiment of the invention can realize the self-adaptive adjustment of the synchronous force of the shifting fork, so that the output target shifting fork synchronous force can cause the shifting fork to move properly, the problems of gear engaging impact, gear engaging noise, gear engaging failure and the like are effectively avoided, and the performance of the vehicle carrying the DCT is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings according to these drawings.
FIG. 1 is a schematic flow chart illustrating a method for adjusting a shifting fork synchronizing force according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a relationship between a synchronous force and a differential speed ratio of a shift fork according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a relationship between a current oil temperature and a correction fork synchronizing force according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating an exemplary method for adjusting a shifting fork synchronizing force according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating another method for adjusting the shifting fork synchronization force according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a relationship between a difference between an actual synchronization time and the target synchronization time and an updated synchronization force increment according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating a relationship between a shifting fork synchronization force and a speed difference ratio after update according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating the relationship between the shifting fork synchronizing force and the differential rotational speed ratio after updating according to another embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating a relationship between a shifting fork synchronizing force and a differential rotational speed ratio according to another embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating a relationship between a shift fork synchronizing force and a differential rotational speed ratio according to another embodiment of the present invention;
fig. 11 is a schematic structural diagram of an adjusting device for shifting fork synchronization force according to an embodiment of the present invention.
Detailed Description
Currently, DCTs can be mounted on conventional internal combustion engine vehicles or hybrid vehicles to improve the performance of the vehicle. In the case of the DCT, the shifting process thereof includes a gear engaging process (i.e., a coupling process of the synchronizer) by the piston pushing the fork to move. In the combination process of the synchronizer, the shifting fork needs to overcome resistances such as shifting fork positioning pins, synchronizer sliding blocks, piston friction, reverse piston obstruction, shifting fork clamping stagnation and the like during moving, and appropriate shifting fork synchronizing force needs to be provided during the moving process of the whole shifting fork. Wherein, suitable shift fork synchronizing force means: the problem that gear shifting impact, gear shifting noise and the like are caused by overlarge synchronous force of the shifting fork is prevented, and the problem that gear shifting fails due to the fact that the synchronous force of the shifting fork is too small is avoided.
However, the inventor researches and finds that, generally, at present, the ratio of the rotational speed difference of the driving end and the driven end of the synchronizer at the synchronization starting time in the gear shifting process to the target synchronization time is calculated and recorded as the rotational speed difference ratio, and the appropriate shifting fork synchronization force is obtained and output by interpolating the rotational speed difference ratio. However, due to different working conditions of the vehicle, the shifting fork synchronization force output by adopting the above calculation method is not "appropriate" in many cases, that is, the shifting fork is pushed to move according to the obtained shifting fork synchronization force, and problems of gear engagement impact, gear engagement noise, gear engagement failure and the like may still be caused in many working conditions.
Based on this, the embodiment of the invention provides a shifting fork synchronization force adjusting method and device, so that a vehicle carrying a DCT can adaptively adjust a target shifting fork synchronization force according to a current working condition in a gear shifting process, and specifically can adjust the target shifting fork synchronization force in the gear shifting process according to the following steps: firstly, acquiring a corresponding relation between shifting fork synchronous force and speed difference ratio stored in advance, the speed difference of a synchronizer driving end and a synchronizer driven end at the synchronous starting moment and the current oil temperature; then, calculating an initial speed difference ratio according to the speed difference and preset target synchronization time, and determining a speed difference ratio interval in which the initial speed difference ratio is in the corresponding relation; then, based on the interpolation formula corresponding to the rotating speed difference ratio interval, calculating the initial shifting fork synchronous force corresponding to the initial rotating speed difference ratio; and finally, determining a correction shifting fork synchronous force based on the current oil temperature, and adjusting the initial shifting fork synchronous force according to the correction shifting fork synchronous force to obtain a target shifting fork synchronous force. Therefore, the adjusting method provided by the embodiment of the invention can realize the self-adaptive adjustment of the synchronous force of the shifting fork, so that the output target shifting fork synchronous force can cause the shifting fork to move properly, the problems of gear engaging impact, gear engaging noise, gear engaging failure and the like are effectively avoided, and the performance of the vehicle carrying the DCT is improved.
The following describes a specific implementation manner of a shifting fork synchronization force adjusting method according to an embodiment of the present invention in detail by using an embodiment with reference to the accompanying drawings.
Fig. 1 shows a schematic flow chart of a method for adjusting a shifting fork synchronizing force according to an embodiment of the present invention. Referring to fig. 1, the method may specifically include:
step 101, in the gear shifting process, obtaining a corresponding relation between shifting fork synchronizing force and a rotating speed difference ratio which are stored in advance, a rotating speed difference of a main driving end and a driven end of a synchronizer at the synchronizing starting moment and the current oil temperature.
It can be understood that, for a vehicle carrying the DCT, the DCT has an Electrically Erasable Programmable Read Only Memory (EEPROM), and the EEPROM stores a correspondence relationship between a shift fork synchronizing force and a ratio of a rotational speed difference in advance, for example: FIG. 2 is a schematic diagram of the corresponding relationship between the synchronous force and the differential speed ratio SSR of the shifting fork1The corresponding shifting fork synchronous force is P1(megapascals, written MPa), speed difference ratio SSR2The corresponding shifting fork synchronous force is P2(MPa), speed differential SSR3The corresponding shifting fork synchronous force is P3(MPa). The shifting fork synchronizing force refers to the pressure of a shifting fork for pushing a gear sleeve of the synchronizer, which is required by the synchronizer to eliminate the speed difference between a driving end and a driven end, in the gear shifting process.
It should be noted that, in addition to the correspondence relationship between the fork synchronizing force and the differential rotation speed ratio being represented and stored in the form of the line graph shown in fig. 2, the correspondence relationship between the fork synchronizing force and the differential rotation speed ratio may be stored in any other form, for example: the tables are not limited herein.
It can be understood that, in the combining process of the shifting synchronizer, the end time of the pre-synchronization stage of the shifting fork is the synchronization start time, and at this time, the rotation speed difference of the master and slave ends of the synchronizer is recorded as the "rotation speed difference of the master and slave ends of the synchronizer at the synchronization start time" in step 101; in the process, when the rotation speed difference of the main driving end and the auxiliary driving end of the synchronizer is completely eliminated, namely is equal to zero, the synchronizer combining process of the gear shifting is recorded as being completed.
It is understood that in a conventional internal combustion engine vehicle or a hybrid vehicle equipped with DCT, fuel may be used for power, and oil with different oil temperatures has different viscosity degrees, for example: in a certain oil temperature range, the lower the oil temperature is, the more viscous the oil is, so that a larger target shifting fork synchronizing force is required to eliminate the rotating speed difference of the driving end and the driven end of the synchronizer; the higher the oil temperature is, the less viscous the oil liquid is, so that the smaller target shifting fork synchronizing force is required to eliminate the rotating speed difference of the driving end and the driven end of the synchronizer. Therefore, the current oil temperature is obtained, and a data basis is provided for obtaining more accurate target shifting fork synchronous force for subsequent adjustment.
And 102, calculating an initial speed difference ratio according to the speed difference and preset target synchronization time, and determining a speed difference ratio interval in which the initial speed difference ratio is in the corresponding relation.
It is understood that the target synchronization time refers to the time taken for the rotational speed difference from the synchronization start time to the master-slave end of the synchronizer to be completely eliminated, which is calibrated in advance. The target synchronization time may be calculated from historical data, or may be preset by experience of a technician, which may be approximately 20-500 milliseconds.
In a specific implementation, the step 102 of "calculating an initial speed difference ratio according to the speed difference and a preset target synchronization time" may specifically include: the method comprises the following steps that firstly, the difference between the rotating speed difference of a synchronizer main driving end and a synchronizer auxiliary driving end at the synchronization starting moment and the rotating speed difference of the synchronizer main driving end and the synchronizer auxiliary driving end at the synchronization finishing moment is calculated; and a second step of dividing the difference value of the previous step by the target synchronization time, and taking the quotient of the difference value of the previous step as an initial rotating speed difference ratio. Since the rotational speed difference between the synchronizer main and driven ends becomes zero at the synchronization completion time, the initial rotational speed difference ratio can be directly referred to as "the initial rotational speed difference ratio is the rotational speed difference between the synchronizer main and driven ends at the synchronization start time/the target synchronization time".
It is understood that there are a plurality of differential speed ratio sections in the pre-stored correspondence between the fork synchronizing force and the differential speed ratio, for example: in the line graph shown in fig. 2, the different sections of the differential rotational speed ratio are divided according to different slopes: (0, SSR)1]，[SSR1,SSR2]，[SSR2,SSR3]And [ SSR)3,∞)。
In particular, in step 102, "determining a differential speed ratio section in which the initial differential speed ratio is in the correspondence relationship", that is, in the correspondence relationship between the shift fork synchronizing force and the differential speed ratio stored in advance, a plurality of differential speed ratio sections are divided, and it is determined in which differential speed ratio section of the plurality of differential speed ratio sections the calculated initial differential speed ratio falls.
For example: referring to fig. 2, if the calculated initial differential rotational speed ratio is the SSR corresponding to point aXThen the SSR can be determinedXIs at (0, SSR)1]An interval; if the calculated initial rotating speed difference ratio is the SSR corresponding to the point BXThen the SSR can be determinedXIn [ SSR)1,SSR2]An interval; if the calculated initial rotating speed difference ratio is SSR corresponding to C pointXThen the SSR can be determinedXIn [ SSR)2,SSR3]An interval; if the calculated initial rotating speed difference ratio is SSR corresponding to D pointXThen the SSR can be determinedXIn [ SSR)3And ∞) interval.
And 103, calculating the initial shifting fork synchronous force corresponding to the initial speed difference ratio based on an interpolation formula corresponding to the speed difference ratio interval.
It can be understood that, in order to perform targeted and accurate interpolation on the obtained initial rotation speed difference ratio, corresponding interpolation formulas are set for different rotation speed difference ratio intervals in advance, and the targeted interpolation formulas are used to realize accurate interpolation, so that more accurate initial fork-pulling synchronization force is obtained.
As an example, as shown in FIG. 2, when step 102 determines the initial speed differential SSRXIs at (0, SSR)1]Interzone or [ SSR1,SSR2]In the interval, that is, the initial differential rotational speed ratio corresponds to point a or point B, the interpolation formula is determined as follows: pX＝P1+(SSRX-SSR1)×(P2-P1)÷(SSR2-SSR1) (ii) a When step 102 determines the initial speed difference ratio SSRXIn [ SSR)2,SSR3]Interzone or [ SSR3And ∞) section, that is, the initial differential rotational speed ratio corresponds to point C or point D, and the interpolation formula is determined as follows: pX＝P3+(SSRX-SSR3)×(P3-P2)÷(SSR3-SSR2). Wherein, the calculation result P in the interpolation formulaXNamely initial rotating speed difference ratio SSRXCorresponding initial shifting fork synchronizing force.
In a specific implementation, after the interpolation formula is determined, the initial speed difference ratio, the speed difference ratio of the boundary point corresponding to the speed difference ratio interval determined in step 102, and the corresponding shifting fork synchronization force may be substituted into the interpolation formula to obtain the corresponding initial shifting fork synchronization force.
And 104, determining a correction shifting fork synchronous force based on the current oil temperature, and adjusting the initial shifting fork synchronous force according to the correction shifting fork synchronous force to obtain a target shifting fork synchronous force.
As an example, determining the modified fork synchronization force based on the current oil temperature may specifically include:
s11, if the current oil temperature is smaller than a preset first oil temperature, determining that the synchronous force of the correction shifting fork is a first value;
s12, if the current oil temperature is not less than the first oil temperature and less than a preset second oil temperature, determining that the correction shifting fork synchronous force is obtained according to a first slope interpolation;
s13, if the current oil temperature is not less than the second oil temperature and less than a preset third oil temperature, determining that the correction shifting fork synchronous force is obtained according to a second slope interpolation;
s14, if the current oil temperature is not less than the third oil temperature, determining that the synchronous force of the correction shifting fork is zero;
wherein the first oil temperature is less than the second oil temperature, which is less than the third oil temperature; the first slope is greater than the second slope.
For example: referring to fig. 3, a relationship diagram of the current oil temperature and the correction fork synchronization force is shown, when the current oil temperature is less than the preset first oil temperature T1Then, the synchronous force of the correcting shifting fork is determined as a first value PX1(ii) a When the current oil temperature is at the first oil temperature T1And the preset second oil temperature T2During the process, the correction shifting fork synchronous force is determined to be obtained by interpolation according to a first slope K1; when the current oil temperature is at the second oil temperature T2And the preset third oil temperature T3Determining that the synchronous force of the correction shifting fork is obtained by interpolation according to a second slope K2 (K2 is smaller than K1); when the current oil temperature is more than or equal to the third oil temperature T3And determining that the synchronous force of the correcting shifting fork is zero.
During concrete realization, according to revise shift fork synchronizing force adjustment initial shift fork synchronizing force obtains target shift fork synchronizing force, specifically can include: and S15, adding the initial shifting fork synchronizing force and the corrected shifting fork synchronizing force to obtain the sum, wherein the sum is used as the target shifting fork synchronizing force.
However, in consideration of the hydraulic capacity of the control system, the upper and lower limits of the control fork synchronization force are limited, that is, as shown in fig. 4, the embodiment of the present invention may further include:
step 405, if the target shifting fork synchronization force is smaller than a first shifting fork synchronization force threshold value and the target shifting fork synchronization force is larger than a second shifting fork synchronization force threshold value, outputting the adjusted target shifting fork synchronization force;
step 406, if the target shifting fork synchronizing force is not less than the first shifting fork synchronizing force threshold, outputting the first shifting fork synchronizing force threshold as the target shifting fork synchronizing force;
step 407, if the target shifting fork synchronizing force is not greater than the second shifting fork synchronizing force threshold, outputting the second shifting fork synchronizing force threshold as the target shifting fork synchronizing force.
For example: assuming that the initial fork-pulling synchronous force is PXCorrected synchronous force of PYThe first shifting fork synchronous force threshold is PHighThe threshold value of the synchronous force of the second shifting fork is PLow(PLow＜PHigh) Then, in a first step, P is calculatedX+PY＝PO(ii) a Second, judging POAnd PLow、PHighIf P is a relationship betweenLow＜PO＜PHighThen output POAs the final target fork synchronizing force; if PO≥PHighThen output PHighAs the final target fork synchronizing force; if PO≤PLowThen output PLowThe final target shifting fork synchronous force is obtained.
Therefore, by the shifting fork synchronization force adjusting method provided by the embodiment of the invention, the target shifting fork synchronization force of a vehicle carrying DCT can be adjusted in a self-adaptive manner according to the current working condition in the gear shifting process, and specifically can be adjusted in the gear shifting process according to the following steps: firstly, acquiring a corresponding relation between a shifting fork synchronizing force and a rotating speed difference ratio which are stored in advance, a rotating speed difference of a driving end and a driven end of a synchronizer at the synchronization starting moment and the current oil temperature; then, calculating an initial speed difference ratio according to the speed difference and preset target synchronization time, and determining a speed difference ratio interval in which the initial speed difference ratio is in the corresponding relation; then, based on the interpolation formula corresponding to the rotating speed difference ratio interval, calculating the initial shifting fork synchronous force corresponding to the initial rotating speed difference ratio; and finally, determining a correction shifting fork synchronizing force based on the current oil temperature, and adjusting the initial shifting fork synchronizing force according to the correction shifting fork synchronizing force to obtain a target shifting fork synchronizing force. Therefore, the adjusting method provided by the embodiment of the invention can realize the self-adaptive adjustment of the shifting fork synchronizing force, so that the output target shifting fork synchronizing force can cause the shifting fork to properly move, the problems of gear engagement impact, gear engagement noise, gear engagement failure and the like are effectively avoided, and the performance of the vehicle carrying the DCT is improved.
In addition, when the target synchronization time is different from the actual synchronization time used actually, the embodiment of the invention also provides a shifting fork synchronization force adjusting method, which is used for automatically updating the corresponding relation between the shifting fork synchronization force and the rotating speed difference ratio stored in advance, so that the target shifting fork synchronization force obtained by adjustment in the following gear shifting process is more accurate.
Fig. 5 is a schematic flow chart illustrating another method for adjusting a shifting fork synchronization force according to an embodiment of the present invention. Referring to fig. 5, the method may specifically include the following steps 501 to 502:
step 501, determining an updated synchronization force increment according to a difference value between the actual synchronization time and the target synchronization time.
As an example, determining an updated synchronization force increment based on a difference between an actual synchronization time and the target synchronization time includes:
s21, if the difference is smaller than a first time threshold, determining the updated synchronization force increment as a first synchronization force increment;
s22, if the difference is not smaller than the first time threshold and smaller than a second time threshold, determining that the updated synchronous force increment is obtained according to a third slope interpolation;
s23, if the difference is not less than the second time threshold and less than a third time threshold, determining that the updated synchronization force increment is a second synchronization force increment;
s24, if the difference is not less than the third time threshold and less than a fourth time threshold, determining that the updated synchronization force increment is a third synchronization force increment;
s25, if the difference is not smaller than the fourth time threshold and smaller than a fifth time threshold, determining that the updated synchronization force increment is obtained according to a fourth slope interpolation;
s26, if the difference is not smaller than the fifth time threshold, determining that the updated synchronization force increment is a fourth synchronization force increment;
wherein the first synchronization force increment is greater than the second synchronization force increment; the second synchronization force increment is greater than zero; zero is greater than the third synchronizing force increment, which is greater than the fourth synchronizing force increment.
For example: see the difference Δ t between the actual synchronization time and the target synchronization time, and the updated synchronization force increment Δ P shown in FIG. 6XWhen the difference Δ t is smaller than a first time threshold t1Then, determining the updated synchronization force increment Δ PXFirst synchronization force increment PX2(ii) a When the difference Deltat is at a first time threshold t1And a second time threshold t2In between, then, determine the updated synchronization force increment Δ PXInterpolating according to the third slope K3; when the difference value Deltat is at the second time threshold value t2And a third time threshold t3In between, then, determine the updated synchronization force increment Δ PXSecond synchronization force increment PX3(ii) a When the difference Deltat is at a third time threshold t3And a fourth time threshold t4In between, then, determine the updated synchronization force increment Δ PXThird synchronization force increment PX4(ii) a When the difference Deltat is at a fourth time threshold t4And a fifth time threshold t5In between, then, determine the updated synchronization force increment Δ PXInterpolating according to a fourth slope K4; when the difference value Deltat is greater than or equal to a fifth time threshold t5Then, determining the updated synchronous force increment delta PXFourth synchronization force increment PX5。
And 502, updating the corresponding relation between the pre-stored shifting fork synchronous force and the rotating speed difference ratio according to the updated synchronous force increment based on the updating formula corresponding to the rotating speed difference ratio interval.
As an example, step 502 may specifically include:
s31, if the speed difference ratio interval is from a first speed difference ratio to a second speed difference ratio, or from zero to the first speed difference ratio, determining the first update formula; wherein the first rotational speed difference ratio is smaller than the second rotational speed difference ratio;
s32, substituting the updated synchronization force increment, the initial speed difference ratio, the first speed difference ratio, the second speed difference ratio, the first fork synchronization force corresponding to the first speed difference ratio, and the second fork synchronization force corresponding to the second speed difference ratio into the first update formula, so as to obtain a third fork synchronization force corresponding to the first speed difference ratio and a fourth fork synchronization force corresponding to the second speed difference ratio;
and S33, respectively updating the first shifting fork synchronous force and the second shifting fork synchronous force by using the third shifting fork synchronous force and the fourth shifting fork synchronous force, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
For example: as shown in fig. 7, it is assumed that the initial rotational speed difference ratio SSR is determinedXIn [ SSR)1,SSR2]Interval, then determine a first update formula:
Figure GDA0003634393300000151
wherein, Δ PXTo update the synchronous force increment, SSRXFor initial differential speed ratio, SSR1For the first speed-difference ratio, SSR2Is the second differential speed ratio, P1Is the first speed difference ratio SSR1Corresponding first fork synchronizing force, P2For a second speed difference ratio SSR2And the corresponding second shifting fork synchronous force.
The above-mentioned delta P is measuredX、SSRX、SSR1、SSR2、P1And P2Substituting into the first updating formula, the first speed difference ratio SSR can be calculated1Corresponding third shifting fork synchronous force P1' and second rotation speed difference ratio SSR2Corresponding fourth shifting fork synchronous force P2'. Referring to the upper line graph in fig. 7, there is a correspondence relationship between the updated fork synchronization force and the rotation speed difference ratio.
Another example is: as shown in fig. 8Suppose that the initial rotation speed difference ratio SSR is determinedXIs at (0, SSR)1]Interval, then determine a first update formula:
Figure GDA0003634393300000161
wherein, Δ PXTo update the synchronous force increment, SSRXFor initial differential rotational speed ratio, SSR1For the first speed difference ratio, SSR2Is the second differential speed ratio, P1Is the first speed difference ratio SSR1Corresponding first fork synchronizing force, P2For a second speed difference ratio SSR2And the corresponding second shifting fork synchronous force.
Converting the above-mentioned Delta PX、SSRX、SSR1、SSR2、P1And P2Substituting into the first updating formula, the first speed difference ratio SSR can be calculated1Corresponding third shifting fork synchronous force P1' and second rotation speed difference ratio SSR2Corresponding fourth shifting fork synchronous force P2'. See the line graph under the trend line in fig. 8, which is the correspondence between the updated fork synchronizing force and the rotational speed difference ratio.
As another example, step 502 may specifically include:
s41, if the speed difference ratio interval is from a second speed difference ratio to a third speed difference ratio, or is greater than the third speed difference ratio, determining the second update formula; wherein the second rotational speed difference ratio is smaller than the third rotational speed difference ratio;
s42, substituting the updated synchronization force increment, the initial speed difference ratio, the second speed difference ratio, the third speed difference ratio, the second fork synchronization force corresponding to the second speed difference ratio, and the fifth fork synchronization force corresponding to the third speed difference ratio into the second update formula, so as to obtain a sixth fork synchronization force corresponding to the second speed difference ratio and a seventh fork synchronization force corresponding to the third speed difference ratio;
and S43, respectively using the sixth shifting fork synchronous force and the seventh shifting fork synchronous force to update the second shifting fork synchronous force and the fifth shifting fork synchronous force, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
For example: as shown in fig. 9, it is assumed that the initial rotational speed difference ratio SSR is determinedXIn [ SSR)2,SSR3]Interval, then determine the second update formula:
Figure GDA0003634393300000162
wherein, Δ PXTo update the synchronous force increment, SSRXFor initial differential rotational speed ratio, SSR2For the second differential speed ratio, SSR3Is the third differential speed ratio, P2For a second speed difference ratio SSR2Corresponding second fork synchronizing force, P3For a third speed difference ratio SSR3And the corresponding fifth shifting fork synchronous force.
Converting the above-mentioned Delta PX、SSRX、SSR2、SSR3、P2And P3Substituting into the second updating formula, the second rotating speed difference ratio SSR can be calculated2Corresponding sixth shifting fork synchronizing force P2"and third rotational speed difference ratio SSR3Corresponding seventh shifting fork synchronizing force P3". Referring to the upper broken line diagram in fig. 9, there is a correspondence relationship between the updated fork synchronization force and the rotation speed difference ratio.
Another example is: as shown in fig. 10, it is assumed that the initial rotational speed difference ratio SSR is determinedXIn [ SSR)3And ∞) interval, then a second update formula is determined:
Figure GDA0003634393300000171
wherein, Δ PXTo update the synchronous force increment, SSRXFor initial differential rotational speed ratio, SSR2For the second differential speed ratio, SSR3To the third differential rotational speed ratio, P2For the second differential rotation speed ratio SSR2Corresponding second fork synchronizing force, P3For a third speed difference ratio SSR3And the corresponding fifth shifting fork synchronous force.
Converting the above-mentioned Delta PX、SSRX、SSR2、SSR3、P2And P3Substituting into the second updating formula, the second rotating speed difference ratio SSR can be calculated2Corresponding sixth shifting fork synchronous force P2"and third rotational speed difference ratio SSR3Corresponding seventh shifting fork synchronizing force P3". See the steeper line graph in fig. 10 for the updated fork synchronization force versus rotational speed difference ratio.
Therefore, by the shifting fork synchronization force adjusting method provided by the embodiment of the invention, the corresponding relation between the pre-stored shifting fork synchronization force and the pre-stored speed difference ratio can be automatically updated, so that the target shifting fork synchronization force obtained by adjustment in the following gear shifting process is more accurate, namely, the output target shifting fork synchronization force can cause the shifting fork to properly move, the problems of gear shifting impact, gear shifting noise, gear shifting failure and the like are effectively avoided, and the performance of the vehicle carrying the DCT is improved.
Correspondingly, the embodiment of the invention also provides a shifting fork synchronizing force adjusting device, and referring to fig. 11, a schematic structural diagram of the shifting fork synchronizing force adjusting device in the embodiment of the invention is shown. In this embodiment, the apparatus may specifically include:
an obtaining unit 1101, configured to obtain, during a gear shifting process, a pre-stored correspondence between a shifting fork synchronization force and a rotation speed difference ratio, a rotation speed difference at a synchronization start time at a driving end and a driven end of a synchronizer, and a current oil temperature;
a first calculating unit 1102, configured to calculate an initial rotational speed difference ratio according to the rotational speed difference and a preset target synchronization time, and determine a rotational speed difference ratio interval in which the initial rotational speed difference ratio is in the corresponding relationship;
a second calculating unit 1103 configured to calculate an initial shifting fork synchronization force corresponding to the initial rotational speed difference ratio based on an interpolation formula corresponding to the rotational speed difference ratio section;
a first determination unit 1104 for determining a correction fork synchronization force based on the current oil temperature;
and an adjusting unit 1105, configured to adjust the initial shifting fork synchronizing force according to the modified shifting fork synchronizing force, so as to obtain a target shifting fork synchronizing force.
Optionally, the first determining unit 1104 includes:
the first determining subunit is used for determining that the synchronous force of the correction shifting fork is a first value if the current oil temperature is less than a preset first oil temperature;
the second determining subunit is used for determining that the correction shifting fork synchronous force is obtained according to a first slope interpolation value if the current oil temperature is not less than the first oil temperature and is less than a preset second oil temperature;
the third determining subunit is used for determining that the correction shifting fork synchronous force is obtained according to a second slope interpolation value if the current oil temperature is not less than the second oil temperature and is less than a preset third oil temperature;
the fourth determining subunit is used for determining that the synchronous force of the correction shifting fork is zero if the current oil temperature is not less than the third oil temperature;
wherein the first oil temperature is less than the second oil temperature, which is less than the third oil temperature; the first slope is greater than the second slope.
Optionally, the adjusting unit 1105 is specifically configured to:
and adding the initial shifting fork synchronous force and the corrected shifting fork synchronous force to obtain a sum, wherein the sum is used as the target shifting fork synchronous force.
Optionally, the apparatus further comprises:
the first output unit is used for outputting the adjusted target shifting fork synchronous force if the target shifting fork synchronous force is smaller than a first shifting fork synchronous force threshold value and the target shifting fork synchronous force is larger than a second shifting fork synchronous force threshold value;
the second output unit is used for outputting the first shifting fork synchronous force threshold value as the target shifting fork synchronous force if the target shifting fork synchronous force is not smaller than the first shifting fork synchronous force threshold value;
and the third output unit is used for outputting the second shifting fork synchronous force threshold value as the target shifting fork synchronous force if the target shifting fork synchronous force is not greater than the second shifting fork synchronous force threshold value.
Optionally, the apparatus further comprises:
the second determining unit is used for determining an updating synchronous force increment according to the difference value between the actual synchronous time and the target synchronous time;
and the updating unit is used for updating the corresponding relation between the pre-stored shifting fork synchronous force and the rotating speed difference ratio according to the updating synchronous force increment based on the updating formula corresponding to the rotating speed difference ratio interval.
Optionally, the second determining unit includes:
a fifth determining subunit, configured to determine, if the difference is smaller than a first time threshold, that the updated synchronization force increment is a first synchronization force increment;
a sixth determining subunit, configured to determine, if the difference is not smaller than the first time threshold and smaller than a second time threshold, that the updated synchronization force increment is obtained according to a third slope interpolation;
a seventh determining subunit, configured to determine, if the difference is not smaller than the second time threshold and smaller than a third time threshold, that the updated synchronization force increment is a second synchronization force increment;
an eighth determining subunit, configured to determine that the updated synchronization force increment is a third synchronization force increment if the difference is not smaller than the third time threshold and smaller than a fourth time threshold;
a ninth determining subunit, configured to determine that the updated synchronization force increment is obtained according to a fourth slope interpolation if the difference is not smaller than the fourth time threshold and smaller than a fifth time threshold;
a tenth determining subunit, configured to determine, if the difference is not smaller than the fifth time threshold, that the updated synchronization force increment is a fourth synchronization force increment;
wherein the first synchronization force increment is greater than the second synchronization force increment; the second synchronization force increment is greater than zero; zero is greater than the third synchronizing force increment, which is greater than the fourth synchronizing force increment.
Optionally, the update unit includes:
an eleventh determining subunit, configured to determine the first update formula if the speed difference ratio interval is from a first speed difference ratio to a second speed difference ratio, or from zero to the first speed difference ratio; wherein the first rotational speed difference ratio is smaller than the second rotational speed difference ratio;
a first calculating subunit, configured to substitute the updated synchronization force increment, the initial speed difference ratio, the first speed difference ratio, the second speed difference ratio, a first fork synchronization force corresponding to the first speed difference ratio, and a second fork synchronization force corresponding to the second speed difference ratio into the first update formula, so as to obtain a third fork synchronization force corresponding to the first speed difference ratio and a fourth fork synchronization force corresponding to the second speed difference ratio;
and the first updating and storing subunit is used for respectively updating the first shifting fork synchronous force and the second shifting fork synchronous force by using the third shifting fork synchronous force and the fourth shifting fork synchronous force, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
Optionally, the update unit includes:
a twelfth determining subunit, configured to determine the second update formula if the speed difference ratio interval is from a second speed difference ratio to a third speed difference ratio, or is greater than the third speed difference ratio; wherein the second rotational speed difference ratio is smaller than the third rotational speed difference ratio;
a second calculating subunit, configured to substitute the updated synchronization force increment, the initial rotation speed difference ratio, the second rotation speed difference ratio, the third rotation speed difference ratio, a second shifting fork synchronization force corresponding to the second rotation speed difference ratio, and a fifth shifting fork synchronization force corresponding to the third rotation speed difference ratio into the second update formula, so as to obtain a sixth shifting fork synchronization force corresponding to the second rotation speed difference ratio and a seventh shifting fork synchronization force corresponding to the third rotation speed difference ratio;
and the second updating and storing subunit is used for respectively updating the second shifting fork synchronous force and the fifth shifting fork synchronous force by using the sixth shifting fork synchronous force and the seventh shifting fork synchronous force, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
The above description is related to the adjustment device for shifting fork synchronization force, wherein specific implementation manners and achieved effects can be referred to the description of the embodiment of the adjustment method for shifting fork synchronization force shown in fig. 1 and fig. 5, and are not repeated herein.
The "first" in the names of "first differential rotational speed ratio", "first fork synchronizing force", etc., mentioned in the embodiments of the present invention is used only for name notation and does not represent the first in sequence. The same applies to "second" etc.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a general hardware platform. With this understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a router, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the device embodiments and vehicle embodiments are substantially similar to the method embodiments and are therefore described in a relatively simple manner, with reference to the section of the description of the method embodiments that follows. The above-described embodiments of the apparatus and the vehicle are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, 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.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. It should be noted that, for a person skilled in the art, several modifications and refinements can be made without departing from the invention, and these modifications and refinements should be regarded as the protection scope of the present invention.

Claims (14)

1. A method for adjusting a shifting fork synchronizing force is characterized by comprising the following steps:
in the gear shifting process, acquiring a corresponding relation between pre-stored shifting fork synchronous force and speed difference ratio, the speed difference of a synchronizer driving end and a synchronizer driven end at the synchronous starting moment and the current oil temperature;
calculating an initial rotating speed difference ratio according to the rotating speed difference and preset target synchronization time, and determining a rotating speed difference ratio interval in which the initial rotating speed difference ratio is in the corresponding relation;
calculating the initial shifting fork synchronous force corresponding to the initial rotating speed difference ratio based on the interpolation formula corresponding to the rotating speed difference ratio interval;
determining a correction shifting fork synchronous force based on the current oil temperature, and adjusting the initial shifting fork synchronous force according to the correction shifting fork synchronous force to obtain a target shifting fork synchronous force; based on current oil temperature confirms that revises shift fork synchronizing force includes:
if the current oil temperature is smaller than a preset first oil temperature, determining that the synchronous force of the correction shifting fork is a first value;
if the current oil temperature is not less than the first oil temperature and less than a preset second oil temperature, determining that the synchronous force of the correction shifting fork is obtained according to a first slope interpolation;
if the current oil temperature is not less than the second oil temperature and less than a preset third oil temperature, determining that the correction shifting fork synchronous force is obtained according to a second slope interpolation;
if the current oil temperature is not less than the third oil temperature, determining that the synchronous force of the correction shifting fork is zero;
wherein the first oil temperature is less than the second oil temperature, which is less than the third oil temperature; the first slope is greater than the second slope.
2. The method of claim 1, wherein said adjusting said initial fork synchronizing force according to said modified fork synchronizing force to obtain a target fork synchronizing force comprises:
and adding the initial shifting fork synchronizing force and the correction shifting fork synchronizing force to obtain a sum, wherein the sum is used as the target shifting fork synchronizing force.
3. The method according to any one of claims 1 to 2, further comprising:
if the target shifting fork synchronous force is smaller than a first shifting fork synchronous force threshold value and the target shifting fork synchronous force is larger than a second shifting fork synchronous force threshold value, outputting the adjusted target shifting fork synchronous force;
if the target shifting fork synchronous force is not smaller than the first shifting fork synchronous force threshold value, outputting the first shifting fork synchronous force threshold value as the target shifting fork synchronous force;
and if the target shifting fork synchronous force is not greater than the second shifting fork synchronous force threshold value, outputting the second shifting fork synchronous force threshold value as the target shifting fork synchronous force.
4. The method of claim 1, further comprising:
determining an updated synchronization force increment according to the difference value between the actual synchronization time and the target synchronization time;
and updating the corresponding relation between the pre-stored shifting fork synchronous force and the rotating speed difference ratio according to the updated synchronous force increment based on the updating formula corresponding to the rotating speed difference ratio interval.
5. The method of claim 4, wherein determining an updated synchronization force increment based on a difference between an actual synchronization time and the target synchronization time comprises:
if the difference is smaller than a first time threshold, determining the updated synchronization force increment as a first synchronization force increment;
if the difference value is not smaller than the first time threshold and smaller than a second time threshold, determining that the updated synchronous force increment is obtained according to a third slope interpolation;
if the difference value is not smaller than the second time threshold and smaller than a third time threshold, determining the updated synchronization force increment to be a second synchronization force increment;
if the difference value is not smaller than the third time threshold and smaller than a fourth time threshold, determining the updated synchronization force increment to be a third synchronization force increment;
if the difference value is not smaller than the fourth time threshold and smaller than a fifth time threshold, determining that the updated synchronous force increment is obtained according to a fourth slope interpolation;
if the difference is not smaller than the fifth time threshold, determining that the updated synchronization force increment is a fourth synchronization force increment;
wherein the first synchronization force increment is greater than the second synchronization force increment; the second synchronization force increment is greater than zero; zero is greater than the third synchronizing force increment, which is greater than the fourth synchronizing force increment.
6. The method according to claim 4, wherein the updating the pre-stored correspondence between the shifting fork synchronization force and the speed difference ratio according to the updated synchronization force increment based on the updated formula corresponding to the speed difference ratio interval comprises:
if the rotating speed difference ratio interval is from a first rotating speed difference ratio to a second rotating speed difference ratio, or from zero to the first rotating speed difference ratio, determining a first updating formula; wherein the first rotational speed difference ratio is smaller than the second rotational speed difference ratio;
substituting the updated synchronous force increment, the initial speed difference ratio, the first speed difference ratio, the second speed difference ratio, a first shifting fork synchronous force corresponding to the first speed difference ratio and a second shifting fork synchronous force corresponding to the second speed difference ratio into the first updating formula to obtain a third shifting fork synchronous force corresponding to the first speed difference ratio and a fourth shifting fork synchronous force corresponding to the second speed difference ratio;
and updating the first shifting fork synchronous force and the second shifting fork synchronous force by using the third shifting fork synchronous force and the fourth shifting fork synchronous force respectively, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
7. The method according to claim 4, wherein the updating the pre-stored correspondence between the shifting fork synchronization force and the rotation speed difference ratio according to the updated synchronization force increment based on the updated formula corresponding to the rotation speed difference ratio interval includes:
if the rotating speed difference ratio interval is from a second rotating speed difference ratio to a third rotating speed difference ratio, or is larger than the third rotating speed difference ratio, determining a second updating formula; wherein the second speed difference ratio is less than the third speed difference ratio;
substituting the updated synchronization force increment, the initial speed difference ratio, the second speed difference ratio, the third speed difference ratio, a second shifting fork synchronization force corresponding to the second speed difference ratio and a fifth shifting fork synchronization force corresponding to the third speed difference ratio into the second updating formula to obtain a sixth shifting fork synchronization force corresponding to the second speed difference ratio and a seventh shifting fork synchronization force corresponding to the third speed difference ratio;
and updating the second shifting fork synchronous force and the fifth shifting fork synchronous force by using the sixth shifting fork synchronous force and the seventh shifting fork synchronous force respectively, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
8. The utility model provides an adjusting device of shift fork synchronizing force which characterized in that includes:
the acquiring unit is used for acquiring the corresponding relation between the shifting fork synchronizing force and the rotating speed difference ratio which are stored in advance, the rotating speed difference of a driving end and a driven end of the synchronizer at the synchronizing starting moment and the current oil temperature in the gear shifting process;
the first calculation unit is used for calculating an initial rotating speed difference ratio according to the rotating speed difference and preset target synchronization time and determining a rotating speed difference ratio interval in which the initial rotating speed difference ratio is in the corresponding relation;
the second calculation unit is used for calculating the initial shifting fork synchronous force corresponding to the initial rotating speed difference ratio based on an interpolation formula corresponding to the rotating speed difference ratio interval;
a first determination unit for determining a correction fork synchronization force based on the current oil temperature; the first determination unit includes:
the first determining subunit is used for determining that the synchronous force of the correction shifting fork is a first value if the current oil temperature is less than a preset first oil temperature;
the second determining subunit is used for determining that the correction shifting fork synchronous force is obtained according to a first slope interpolation value if the current oil temperature is not less than the first oil temperature and is less than a preset second oil temperature;
the third determining subunit is used for determining that the correction shifting fork synchronous force is obtained according to a second slope interpolation value if the current oil temperature is not less than the second oil temperature and is less than a preset third oil temperature;
the fourth determining subunit is used for determining that the synchronous force of the correction shifting fork is zero if the current oil temperature is not less than the third oil temperature;
wherein the first oil temperature is less than the second oil temperature, which is less than the third oil temperature; the first slope is greater than the second slope;
and the adjusting unit is used for adjusting the initial shifting fork synchronous force according to the corrected shifting fork synchronous force to obtain the target shifting fork synchronous force.
9. The apparatus according to claim 8, wherein the adjusting unit is specifically configured to:
and adding the initial shifting fork synchronous force and the corrected shifting fork synchronous force to obtain a sum, wherein the sum is used as the target shifting fork synchronous force.
10. The apparatus of any one of claims 8 to 9, further comprising:
the first output unit is used for outputting the adjusted target shifting fork synchronous force if the target shifting fork synchronous force is smaller than a first shifting fork synchronous force threshold value and the target shifting fork synchronous force is larger than a second shifting fork synchronous force threshold value;
the second output unit is used for outputting the first shifting fork synchronous force threshold value as the target shifting fork synchronous force if the target shifting fork synchronous force is not smaller than the first shifting fork synchronous force threshold value;
and the third output unit is used for outputting the second shifting fork synchronous force threshold value as the target shifting fork synchronous force if the target shifting fork synchronous force is not greater than the second shifting fork synchronous force threshold value.
11. The apparatus of claim 8, further comprising:
the second determining unit is used for determining an updating synchronous force increment according to the difference value between the actual synchronous time and the target synchronous time;
and the updating unit is used for updating the corresponding relation between the pre-stored shifting fork synchronous force and the rotating speed difference ratio according to the updating synchronous force increment based on the updating formula corresponding to the rotating speed difference ratio interval.
12. The apparatus of claim 11, wherein the second determining unit comprises:
a fifth determining subunit, configured to determine, if the difference is smaller than a first time threshold, that the updated synchronization force increment is a first synchronization force increment;
a sixth determining subunit, configured to determine, if the difference is not smaller than the first time threshold and smaller than a second time threshold, that the updated synchronization force increment is obtained according to a third slope interpolation;
a seventh determining subunit, configured to determine, if the difference is not smaller than the second time threshold and smaller than a third time threshold, that the updated synchronization force increment is a second synchronization force increment;
an eighth determining subunit, configured to determine that the updated synchronization force increment is a third synchronization force increment if the difference is not smaller than the third time threshold and smaller than a fourth time threshold;
a ninth determining subunit, configured to determine that the updated synchronization force increment is obtained according to a fourth slope interpolation if the difference is not smaller than the fourth time threshold and smaller than a fifth time threshold;
a tenth determining subunit, configured to determine, if the difference is not smaller than the fifth time threshold, that the updated synchronization force increment is a fourth synchronization force increment;
wherein the first synchronization force increment is greater than the second synchronization force increment; the second synchronization force increment is greater than zero; zero is greater than the third synchronizing force increment, which is greater than the fourth synchronizing force increment.
13. The apparatus of claim 11, wherein the updating unit comprises:
an eleventh determining subunit, configured to determine a first update formula if the speed difference ratio interval is from a first speed difference ratio to a second speed difference ratio, or from zero to the first speed difference ratio; wherein the first rotational speed difference ratio is smaller than the second rotational speed difference ratio;
a first calculating subunit, configured to substitute the updated synchronization force increment, the initial speed difference ratio, the first speed difference ratio, the second speed difference ratio, a first fork synchronization force corresponding to the first speed difference ratio, and a second fork synchronization force corresponding to the second speed difference ratio into the first update formula, so as to obtain a third fork synchronization force corresponding to the first speed difference ratio and a fourth fork synchronization force corresponding to the second speed difference ratio;
and the first updating and storing subunit is used for respectively updating the first shifting fork synchronous force and the second shifting fork synchronous force by using the third shifting fork synchronous force and the fourth shifting fork synchronous force, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
14. The apparatus of claim 11, wherein the updating unit comprises:
a twelfth determining subunit, configured to determine a second update formula if the speed difference ratio interval is from a second speed difference ratio to a third speed difference ratio, or is greater than the third speed difference ratio; wherein the second rotational speed difference ratio is smaller than the third rotational speed difference ratio;
a second calculating subunit, configured to substitute the updated synchronization force increment, the initial speed difference ratio, the second speed difference ratio, the third speed difference ratio, a second shifting fork synchronization force corresponding to the second speed difference ratio, and a fifth shifting fork synchronization force corresponding to the third speed difference ratio into the second update formula, so as to obtain a sixth shifting fork synchronization force corresponding to the second speed difference ratio and a seventh shifting fork synchronization force corresponding to the third speed difference ratio;
and the second updating and storing subunit is used for respectively updating the second shifting fork synchronous force and the fifth shifting fork synchronous force by using the sixth shifting fork synchronous force and the seventh shifting fork synchronous force, and updating and storing the corresponding relation between the shifting fork synchronous force and the rotating speed difference ratio.
CN201910785819.6A 2019-08-23 2019-08-23 Method and device for adjusting synchronous force of shifting fork Active CN112413117B (en)

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FR2954440A1 (en) * 2009-12-17 2011-06-24 Peugeot Citroen Automobiles Sa METHOD FOR CONTROLLING A SYNCHRONIZER IN A GEARBOX
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