CN111059277B - Gear shifting control method and device - Google Patents
Gear shifting control method and device Download PDFInfo
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- CN111059277B CN111059277B CN201911345043.2A CN201911345043A CN111059277B CN 111059277 B CN111059277 B CN 111059277B CN 201911345043 A CN201911345043 A CN 201911345043A CN 111059277 B CN111059277 B CN 111059277B
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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
- F16H61/02—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 the signals used
- F16H61/0262—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 the signals used the signals being hydraulic
- F16H61/0265—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 the signals used the signals being hydraulic for gearshift control, e.g. control functions for performing shifting or generation of shift signals
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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
- F16H61/04—Smoothing ratio shift
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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
- F16H61/04—Smoothing ratio shift
- F16H2061/0459—Smoothing ratio shift using map for shift parameters, e.g. shift time, slip or pressure gradient, for performing controlled shift transition and adapting shift parameters by learning
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Abstract
The invention provides a gear-shifting control method and a device, which are applied to the technical field of automobiles, the method determines the transmission ratio variation of a hydraulic transmission system according to the transmission ratio variation after acquiring the transmission ratio variation rate and the current transmission ratio of the hydraulic transmission system, determines a target transmission ratio range based on the obtained transmission ratio variation and the maximum transmission ratio of the hydraulic transmission system, controls a mechanical transmission system to shift gears if the obtained current transmission ratio is in the target transmission ratio range, can enable the mechanical transmission system to shift gears before the hydraulic transmission system reaches the maximum transmission ratio because the upper limit value of the target transmission ratio range is smaller than the maximum transmission ratio of the hydraulic transmission system, and can adjust the transmission ratio in the current transmission direction at least in part of time under the condition of the same gear-shifting time, thereby reducing the time for the hydraulic transmission system to reversely adjust the transmission ratio after the gear-shifting, therefore, the following effect of the transmission ratio is improved, and the speed-up performance of the vehicle is improved.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a gear shifting control method and device.
Background
The HMCVT (Hydro-mechanical continuously variable transmission) is composed of a hydraulic transmission system, a mechanical transmission system, a flow dividing mechanism and a converging mechanism, is a transmission form in which hydraulic power flow and mechanical power flow are connected in parallel, a hydraulic element only bears one part of the maximum power, other powers are transmitted by the mechanical transmission system and finally are output after converging by the converging mechanism, stepless change of a transmission ratio is realized, and the HMCVT is characterized in that power transmission is realized through mechanical transmission, and stepless speed change is realized through combination of hydraulic pressure and machinery.
In the practical use of the HMCVT, the hydraulic transmission system can carry out stepless speed change in a forward transmission mode or a reverse transmission mode, meanwhile, the mechanical transmission system is provided with different gears, and the hydraulic transmission system and the mechanical transmission system are matched with each other to realize stepless change output corresponding to the transmission ratio of the gearbox under a certain gear. Under the condition that the vehicle is continuously accelerated, the hydraulic transmission system outputs the maximum transmission ratio in the current transmission direction, the transmission ratio of the gearbox combined with the current clutch gear cannot meet the transmission requirement, at the moment, the mechanical transmission system needs to be controlled to shift, and in the gear after shifting, the stepless change of the transmission ratio of the gearbox is finally realized through the stepless adjustment of the transmission ratio of the hydraulic transmission system.
However, the time consumption of the gear shifting process of the mechanical transmission system is long and can reach 1-2 seconds, after the gear shifting time of 1-2 seconds, if the required transmission ratio of the gearbox changes greatly, the hydraulic transmission system needs to be switched to a certain large transmission ratio in the opposite transmission direction from the maximum value of the transmission ratio in the current transmission direction, the resistance caused by the transmission direction conversion needs to be overcome in the whole transmission ratio changing process, the hydraulic transmission system is difficult to respond quickly, the actual transmission ratio output of the HMCVT cannot follow the change of the required transmission ratio in real time, and the vehicle speed cannot be increased in time.
Disclosure of Invention
In view of the above, the present invention provides a gear shift control method and device, which control a mechanical transmission system to shift in advance according to a transmission ratio change rate of a hydraulic transmission system, reduce time for the hydraulic transmission system to adjust a transmission ratio in a reverse direction after shifting, improve a transmission ratio following effect, and improve a speed-up performance of a vehicle, and the specific scheme is as follows:
in a first aspect, the present invention provides a shift control method comprising:
acquiring the transmission ratio change rate and the current transmission ratio of the hydraulic transmission system;
determining the transmission ratio variation of the hydraulic transmission system in the gear shifting process of the mechanical transmission system according to the transmission ratio variation rate;
determining a target gear ratio range based on the gear ratio change amount and a gear ratio maximum value of the hydraulic transmission system, wherein an upper limit value of the target gear ratio range is smaller than the gear ratio maximum value;
and if the current transmission ratio is within the target transmission ratio range, controlling the mechanical transmission system to shift.
Optionally, the determining, according to the transmission ratio change rate, a transmission ratio change amount of the hydraulic transmission system in a gear shifting process of the mechanical transmission system includes:
acquiring a preset gear shifting duration of a mechanical transmission system;
and calculating the product of the transmission ratio change rate and the preset gear shifting duration to obtain the transmission ratio variation of the hydraulic transmission system.
Optionally, the determining a target gear ratio range based on the gear ratio variation and the gear ratio maximum value of the hydraulic transmission system includes:
calculating a difference value between the maximum transmission ratio value of the hydraulic transmission system and the transmission ratio variation to obtain a reference transmission ratio;
a target gear ratio range is determined based on the reference gear ratio.
Optionally, the determining a target gear ratio range based on the reference gear ratio comprises:
determining the difference value between the reference transmission ratio and a preset adjusting value as the lower limit value of a target transmission ratio range, wherein the preset adjusting value is a positive value;
determining the reference gear ratio as an upper limit value of the target gear ratio range.
Optionally, the determining a target gear ratio range based on the reference gear ratio comprises:
determining the sum of the reference transmission ratio and a preset adjusting value as an upper limit value of a target transmission ratio range;
and determining the reference transmission ratio as a lower limit value of the target transmission ratio range.
Optionally, the obtaining a gear ratio change rate of the hydraulic transmission system includes:
acquiring the transmission ratio of the hydraulic transmission system at the previous moment, wherein the previous moment is the moment corresponding to a preset time interval before the current moment;
calculating the difference between the transmission ratio at the previous moment and the current transmission ratio to obtain a transmission ratio difference value;
and calculating the ratio of the transmission ratio difference to the preset time length to obtain the transmission ratio change rate of the hydraulic transmission system.
In a second aspect, the present invention provides a shift control device comprising:
the acquisition unit is used for acquiring the transmission ratio change rate and the current transmission ratio of the hydraulic transmission system;
the first determination unit is used for determining the transmission ratio variation of the hydraulic transmission system in the gear shifting process of the mechanical transmission system according to the transmission ratio variation rate;
a second determination unit configured to determine a target gear ratio range based on the gear ratio change amount and a gear ratio maximum value of the hydraulic transmission system, wherein an upper limit value of the target gear ratio range is smaller than the gear ratio maximum value;
and the control unit is used for controlling the mechanical transmission system to shift if the current transmission ratio is within the target transmission ratio range.
Optionally, the first determining unit is configured to, when determining, according to the transmission ratio change rate, a transmission ratio change amount of the hydraulic transmission system in a gear shifting process of the mechanical transmission system, specifically include:
acquiring a preset gear shifting duration of a mechanical transmission system;
and calculating the product of the transmission ratio change rate and the preset gear shifting duration to obtain the transmission ratio variation of the hydraulic transmission system.
Optionally, the second determining unit, configured to determine the target transmission ratio range based on the transmission ratio variation and the maximum transmission ratio of the hydraulic transmission system, specifically includes:
calculating a difference value between the maximum transmission ratio value of the hydraulic transmission system and the transmission ratio variation to obtain a reference transmission ratio;
a target gear ratio range is determined based on the reference gear ratio.
Optionally, the obtaining unit is configured to, when obtaining a transmission ratio change rate of the hydraulic transmission system, specifically include:
acquiring the transmission ratio of the hydraulic transmission system at the previous moment, wherein the previous moment is the moment corresponding to a preset time interval before the current moment;
calculating the difference between the transmission ratio at the previous moment and the current transmission ratio to obtain a transmission ratio difference value;
and calculating the ratio of the transmission ratio difference to the preset time length to obtain the transmission ratio change rate of the hydraulic transmission system.
Based on the technical scheme, the gear shifting control method provided by the invention is characterized in that after the gear ratio change rate and the current gear ratio of the hydraulic transmission system are obtained, the gear ratio change quantity of the hydraulic transmission system is determined according to the gear ratio change rate, the target gear ratio range is further determined based on the obtained gear ratio change quantity and the maximum value of the gear ratio of the hydraulic transmission system, and if the obtained current gear ratio is within the target gear ratio range, the mechanical transmission system is controlled to shift.
In the gear shifting control method, the upper limit value of the target transmission ratio range is smaller than the maximum transmission ratio value of the hydraulic transmission system, so that the mechanical transmission system can shift before the hydraulic transmission system reaches the maximum transmission ratio value, under the condition of the same gear shifting time, the hydraulic transmission system at least partially adjusts the transmission ratio in the current transmission direction, and the time for reversely adjusting the transmission ratio by the hydraulic transmission system after gear shifting is reduced, so that the transmission ratio following effect is improved, and the speed raising performance of a vehicle is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a shift control method provided by an embodiment of the present invention;
fig. 2 is a block diagram of a shift control device according to an embodiment of the present invention;
fig. 3 is a block diagram of a controller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are 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.
As described above, the HMCVT is composed of a hydraulic transmission system, a mechanical transmission system, a split mechanism, and a confluence mechanism, and is a transmission form in which hydraulic power flow and mechanical power flow are connected in parallel, a hydraulic element only bears a part of the maximum power, and other powers are transmitted by the mechanical transmission system, and are finally converged by the confluence mechanism and then output, thereby realizing stepless change of transmission ratio, realizing power transmission through mechanical transmission, and realizing stepless speed change through combination of hydraulic pressure and machinery.
Compared with the traditional mechanical stepped transmission, the HMCVT has the following characteristics:
the stepless speed change device can automatically adapt to the change of load and running resistance, realize stepless speed change, ensure that an engine works at an optimal working point, and is beneficial to improving the dynamic property, the fuel economy and the working efficiency of a vehicle.
Secondly, liquid is used as a force transmission medium, the dynamic load of a transmission system is greatly reduced, the engine is easy to prevent overload and flameout, the service life of related parts can be prolonged, and the method is particularly important for agricultural machinery and engineering machinery with severe working conditions.
And the vehicle runs stably, can absorb and attenuate vibration, reduces impact and noise, and improves riding comfort.
Fourthly, the tractor has very low stable running speed, and the trafficability and low-speed operation quality of the tractor on a bad road can be improved.
The operation is light, the gear shifting automation is convenient to realize, and the labor intensity of a driver is reduced.
And compared with pure mechanical transmission, the transmission efficiency is not very high, the requirements on a variable pump, a fixed-displacement motor and a hydraulic system are high, and the manufacturing and using costs are high. The transmission integrates the main advantages of hydraulic transmission and mechanical transmission, and has stepless speed regulation performance and higher transmission efficiency.
Based on the above premise, an embodiment of the present invention provides a gear shift control method, and referring to fig. 1, fig. 1 is a flowchart of the gear shift control method provided in the embodiment of the present invention, and the method can be applied to a controller integrated by an HMCVT itself, a controller of a vehicle transmission system, further, other executable control programs installed in a vehicle, a controller that performs operation processing on data, and obviously, in some cases, also can be applied to a server on a network side; referring to fig. 1, a shift control method according to an embodiment of the present invention may include:
and S100, acquiring the transmission ratio change rate and the current transmission ratio of the hydraulic transmission system.
As mentioned above, the hydraulic transmission system of the HMCVT can perform stepless speed change in forward transmission and reverse transmission modes, and in any gear position where the mechanical transmission system is located, the hydraulic transmission system is used to realize stepless change of transmission ratio of the gearbox relative to a certain gear position under the gear position of the current mechanical transmission system, and the stepless change of the output shaft of the HMCVT is realized by the hydraulic transmission system. Therefore, the transmission ratio change rate of the hydraulic transmission system is the transmission ratio change rate of the output shaft of the HMCVT, and of course, the transmission ratio of the output of the hydraulic transmission system is different from the transmission ratio of the output shaft of the HMCVT in specific values.
In practical applications, particularly during continuous acceleration of the vehicle, the driver tends to exert a continuous and steady force on the accelerator pedal, so that the rate of change of the transmission ratio of the hydraulic transmission system over a certain period of time can be regarded as a constant value. In an embodiment of the present invention, it is first necessary to obtain the gear ratio rate of change of the hydraulic transmission system and the current gear ratio of the hydraulic transmission system. It is conceivable that the current gear ratio referred to herein refers to the gear ratio of the hydraulic transmission system obtained in the present execution cycle.
Optionally, when the current transmission ratio of the hydraulic transmission system is obtained, the transmission ratio of the hydraulic transmission system at the previous moment is obtained, where the previous moment mentioned in the embodiment of the present invention is a moment before the current moment and is spaced by a time corresponding to a preset time duration, then a difference between the transmission ratio at the previous moment and the current transmission ratio is calculated to obtain a transmission ratio difference, a ratio between the obtained transmission ratio difference and the preset time duration is calculated, and the obtained ratio is the transmission ratio change rate of the hydraulic transmission system.
It should be noted that, since the transmission ratio and the transmission ratio change rate of the hydraulic transmission system change during the running of the vehicle, the shift control method provided by the embodiment of the present invention may be executed cyclically according to a preset execution period during the running of the vehicle, or may be executed in a case where it is determined that the HMCVT needs to execute the shift operation according to the existing control logic.
And S110, determining the transmission ratio variation of the hydraulic transmission system in the gear shifting process of the mechanical transmission system according to the transmission ratio variation rate.
Alternatively, for a certain HMCVT, the shift time of its mechanical transmission system is often determinable, and in a specific application, the corresponding shift time period may be pre-stored in the control program. Therefore, after the gear ratio change rate of the hydraulic transmission system is obtained, the preset gear shifting duration of the mechanical transmission system is obtained, and the product of the gear ratio change rate and the preset gear shifting duration is calculated, so that the gear ratio change quantity of the hydraulic transmission system can be obtained.
It is conceivable that, for the preset shift duration of the mechanical transmission system, besides the actual condition of the mechanical transmission system, a certain margin value may be provided appropriately on the basis of the actual condition, that is, the value of the preset shift duration is appropriately extended, which is also optional, and the preset shift duration also falls within the protection scope of the present invention without departing from the scope of the core idea of the present invention.
And S120, determining a target transmission ratio range based on the transmission ratio variation and the maximum transmission ratio of the hydraulic transmission system.
Optionally, after the gear ratio variation of the hydraulic transmission system during the gear shifting of the mechanical transmission system is obtained through calculation, a difference between a maximum gear ratio of the hydraulic transmission system and the gear ratio variation is firstly calculated to obtain a reference gear ratio, and then the obtained reference gear ratio is used as a standard to determine a target gear ratio range based on the reference gear ratio.
Alternatively, the embodiment of the present invention provides two methods for determining the target gear ratio range based on the reference gear ratio, and the two methods for determining the target gear ratio range are explained as follows:
the first method comprises the following steps: presetting a preset adjusting value with a positive value, calculating a difference value between the reference transmission ratio and the preset adjusting value, taking the obtained difference value as a lower limit value of a target transmission ratio range, and meanwhile, determining the reference transmission ratio as an upper limit value of the target transmission ratio range.
It is conceivable that the reference gear ratio is obtained by subtracting the gear ratio maximum value of the hydraulic transmission system from the gear ratio variation amount, and therefore, taking the reference gear ratio as the upper limit value of the target gear ratio range, it is possible to ensure that the upper limit value of the target gear ratio range is smaller than the gear ratio maximum value of the hydraulic transmission system.
And the second method comprises the following steps: and calculating the sum of the reference transmission ratio and the preset adjustment value, taking the sum as the upper limit value of the target transmission ratio range, and further determining the reference transmission ratio as the lower limit value of the target transmission ratio range.
It should be noted that, the sum of the reference transmission ratio and the preset adjustment value is used as the upper limit value of the target transmission ratio range, and the preset adjustment value cannot be selected greatly, and the upper limit value of the target transmission ratio range is ensured to be smaller than the maximum transmission ratio value of the hydraulic transmission system.
According to the solving process of the reference transmission ratio, when the actual transmission ratio of the hydraulic transmission system just reaches the reference transmission ratio, the mechanical transmission system is controlled to shift, after the inherent shifting duration of the mechanical transmission system, the actual transmission ratio of the hydraulic transmission system just reaches the maximum value of the current transmission direction while the mechanical transmission system completes shifting, and then the hydraulic transmission system can perform reverse transmission, so that the transmission capacity of the hydraulic transmission system is fully exerted, meanwhile, in the whole shifting process of the mechanical transmission system, the hydraulic transmission system is in the transmission ratio adjusting process in the same direction, and the most ideal and rapid shifting response process is obtained.
In consideration of the fact that some errors may exist in actual operation, for example, the preset gear shifting duration is different from the actual gear shifting duration of the mechanical transmission system, the target gear ratio range is set based on the reference gear ratio, and the performability of the technical scheme is improved.
Specifically, for the target transmission ratio range determined in the first mode, the reference transmission ratio is an upper limit value, and under the optimal condition, when the transmission ratio of the hydraulic transmission system reaches the reference transmission ratio, the mechanical transmission system is controlled to shift; in other situations, the gear shifting will cause the actual transmission ratio of the hydraulic transmission system to not reach the maximum transmission ratio when the mechanical transmission system is shifted, and the performance of the hydraulic transmission system is not fully exerted.
For the target gear ratio range determined in the second manner, the reference gear ratio is taken as a lower limit value, and the sum of the reference gear ratio and the preset adjustment value is taken as an upper limit value. The ideal shifting moment of the mechanical transmission system is the moment when the actual transmission ratio of the hydraulic transmission system reaches the reference transmission ratio, and the description is omitted here. In other cases, the actual gear ratio of the hydraulic transmission system will be greater than the reference gear ratio and less than the maximum gear ratio, resulting in the hydraulic transmission system being in the current drive direction for a portion of the time and in the reverse drive direction for a portion of the time during the entire shift of the mechanical transmission system.
In this case it is ensured that the performance of the hydraulic transmission system is fully developed, i.e. a maximum value of the transmission ratio is certainly output, but at the same time, the hydraulic transmission system operates in a direction change during a part of the shifting process of the mechanical transmission system, which affects the response effect of the transmission ratio to a certain extent.
Therefore, no matter which way the target transmission ratio range is determined, the response effect of the HMCVT can be improved to a certain extent compared with the prior art. It should be noted that, in order to fully exert the performance of the hydraulic transmission system and better improve the response effect when the HMCVT is shifted, the value of the preset adjustment value should not be too large, so as to meet the shifting requirement of the actual vehicle.
S130, judging whether the current transmission ratio is in the target transmission ratio range, if so, executing S140.
After determining the target gear ratio range based on any one of the above methods, it is determined whether the current gear ratio of the hydraulic transmission system is within the target gear ratio range, and if so, S140 is executed to control the mechanical transmission system to shift gears.
And S140, controlling the mechanical transmission system to shift gears.
And under the condition that the current transmission ratio of the hydraulic transmission system is in the target transmission ratio range, the mechanical transmission system can be controlled to shift.
The control of the mechanical transmission system to shift gears, the specific shifting process of the mechanical transmission system, and the control process of the hydraulic transmission system after the mechanical transmission system is shifted gears can be realized by referring to the implementation mode in the prior art, which is not limited in the invention.
In summary, in the shift control method, since the upper limit value of the target transmission ratio range is smaller than the maximum transmission ratio value of the hydraulic transmission system, the mechanical transmission system can shift before the hydraulic transmission system reaches the maximum transmission ratio value, and under the condition of the same shift time, the hydraulic transmission system at least partially adjusts the transmission ratio in the current transmission direction, so that the time for the hydraulic transmission system to reversely adjust the transmission ratio after shifting is reduced, the transmission ratio following effect is improved, and the speed-up performance of the vehicle is improved.
It should be noted that, in the shift control method provided in any of the above embodiments, the gear ratio change rate of the hydraulic transmission system and the gear ratio of the hydraulic transmission system both have positive and negative directions, and in general, the gear ratio change rate during vehicle acceleration is a positive value, and conversely, the gear ratio change rate is a negative value. For the transmission ratio, the forward transmission direction and the reverse transmission direction of the hydraulic transmission system in the prior art need to be divided.
In the following, the shift control device provided in the embodiment of the present invention is introduced, and the shift control device described below may be regarded as a functional module architecture that needs to be set in a central device to implement the shift control method provided in the embodiment of the present invention; the following description may be cross-referenced with the above.
Fig. 2 is a block diagram of a shift control device according to an embodiment of the present invention, and referring to fig. 2, the shift control device may include:
the acquiring unit 10 is used for acquiring the transmission ratio change rate and the current transmission ratio of the hydraulic transmission system;
the first determining unit 20 is configured to determine, according to the transmission ratio change rate, a transmission ratio change amount of the hydraulic transmission system during a gear shifting process of the mechanical transmission system;
a second determination unit 30 configured to determine a target gear ratio range based on the gear ratio change amount and a gear ratio maximum value of the hydraulic transmission system, wherein an upper limit value of the target gear ratio range is smaller than the gear ratio maximum value;
and the control unit 40 is used for controlling the mechanical transmission system to shift if the current transmission ratio is within the target transmission ratio range.
Optionally, the first determining unit 20 is configured to, when determining, according to the transmission ratio change rate, a transmission ratio change amount of the hydraulic transmission system in a gear shifting process of the mechanical transmission system, specifically include:
acquiring a preset gear shifting duration of a mechanical transmission system;
and calculating the product of the transmission ratio change rate and the preset gear shifting duration to obtain the transmission ratio variation of the hydraulic transmission system.
Optionally, the second determining unit 30 is configured to, when determining the target transmission ratio range based on the transmission ratio variation and the maximum transmission ratio of the hydraulic transmission system, specifically include:
calculating a difference value between the maximum transmission ratio value of the hydraulic transmission system and the transmission ratio variation to obtain a reference transmission ratio;
a target gear ratio range is determined based on the reference gear ratio.
Optionally, the second determining unit 30 is configured to, when determining the target gear ratio range based on the reference gear ratio, specifically include:
determining the difference value between the reference transmission ratio and a preset adjusting value as the lower limit value of a target transmission ratio range, wherein the preset adjusting value is a positive value;
determining the reference gear ratio as an upper limit value of the target gear ratio range.
Optionally, the second determining unit 30 is configured to, when determining the target gear ratio range based on the reference gear ratio, specifically include:
determining the sum of the reference transmission ratio and a preset adjusting value as an upper limit value of a target transmission ratio range;
and determining the reference transmission ratio as a lower limit value of the target transmission ratio range.
Optionally, the obtaining unit 10 is configured to, when obtaining a transmission ratio change rate of the hydraulic transmission system, specifically include:
acquiring the transmission ratio of the hydraulic transmission system at the previous moment, wherein the previous moment is the moment corresponding to a preset time interval before the current moment;
calculating the difference between the transmission ratio at the previous moment and the current transmission ratio to obtain a transmission ratio difference value;
and calculating the ratio of the transmission ratio difference to the preset time length to obtain the transmission ratio change rate of the hydraulic transmission system.
Optionally, referring to fig. 3, fig. 3 is a block diagram of a controller according to an embodiment of the present invention, and as shown in fig. 3, the controller may include: at least one processor 100, at least one communication interface 200, at least one memory 300, and at least one communication bus 400;
in the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300, and the communication bus 400 is at least one, and the processor 100, the communication interface 200, and the memory 300 complete the communication with each other through the communication bus 400; it is clear that the communication connections shown by the processor 100, the communication interface 200, the memory 300 and the communication bus 400 shown in fig. 3 are merely optional;
optionally, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module;
the processor 100 may be a central processing unit CPU or an application Specific Integrated circuit asic or one or more Integrated circuits configured to implement embodiments of the present invention.
The memory 300, which stores application programs, may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 100 is specifically configured to execute an application program in the memory to implement any of the embodiments of the shift control method described above.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software.
Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A shift control method characterized by comprising:
acquiring the transmission ratio change rate and the current transmission ratio of the hydraulic transmission system;
determining the transmission ratio variation of the hydraulic transmission system in the gear shifting process of the mechanical transmission system according to the transmission ratio variation rate;
determining a target gear ratio range based on the gear ratio change amount and a gear ratio maximum value of the hydraulic transmission system, wherein an upper limit value of the target gear ratio range is smaller than the gear ratio maximum value;
if the current transmission ratio is within the target transmission ratio range, controlling a mechanical transmission system to shift;
the determining a target gear ratio range based on the gear ratio change amount and a gear ratio maximum value of the hydraulic transmission system includes:
calculating a difference value between the maximum transmission ratio value of the hydraulic transmission system and the transmission ratio variation to obtain a reference transmission ratio;
a target gear ratio range is determined based on the reference gear ratio.
2. The shift control method of claim 1, wherein said determining a gear ratio change of the hydraulic transmission system during a mechanical transmission system shift based on the gear ratio change rate comprises:
acquiring a preset gear shifting duration of a mechanical transmission system;
and calculating the product of the transmission ratio change rate and the preset gear shifting duration to obtain the transmission ratio variation of the hydraulic transmission system.
3. The shift control method according to claim 2, wherein the determining a target gear ratio range based on the reference gear ratio includes:
determining the difference value between the reference transmission ratio and a preset adjusting value as the lower limit value of a target transmission ratio range, wherein the preset adjusting value is a positive value;
determining the reference gear ratio as an upper limit value of the target gear ratio range.
4. The shift control method according to claim 2, wherein the determining a target gear ratio range based on the reference gear ratio includes:
determining the sum of the reference transmission ratio and a preset adjusting value as an upper limit value of a target transmission ratio range;
and determining the reference transmission ratio as a lower limit value of the target transmission ratio range.
5. The shift control method of claim 1, wherein the obtaining a gear ratio rate of change of the hydraulic transmission system includes:
acquiring the transmission ratio of the hydraulic transmission system at the previous moment, wherein the previous moment is the moment corresponding to a preset time interval before the current moment;
calculating the difference between the transmission ratio at the previous moment and the current transmission ratio to obtain a transmission ratio difference value;
and calculating the ratio of the transmission ratio difference to the preset time length to obtain the transmission ratio change rate of the hydraulic transmission system.
6. A shift control device, characterized by comprising:
the acquisition unit is used for acquiring the transmission ratio change rate and the current transmission ratio of the hydraulic transmission system;
the first determination unit is used for determining the transmission ratio variation of the hydraulic transmission system in the gear shifting process of the mechanical transmission system according to the transmission ratio variation rate;
a second determination unit configured to determine a target gear ratio range based on the gear ratio change amount and a gear ratio maximum value of the hydraulic transmission system, wherein an upper limit value of the target gear ratio range is smaller than the gear ratio maximum value;
the control unit is used for controlling the mechanical transmission system to shift if the current transmission ratio is within the target transmission ratio range;
the second determination unit, configured to determine the target gear ratio range based on the gear ratio variation and the gear ratio maximum value of the hydraulic transmission system, specifically includes:
calculating a difference value between the maximum transmission ratio value of the hydraulic transmission system and the transmission ratio variation to obtain a reference transmission ratio;
a target gear ratio range is determined based on the reference gear ratio.
7. The shift control device according to claim 6, wherein the first determining unit, when determining the gear ratio variation of the hydraulic transmission system during the gear shift of the mechanical transmission system according to the gear ratio variation rate, specifically includes:
acquiring a preset gear shifting duration of a mechanical transmission system;
and calculating the product of the transmission ratio change rate and the preset gear shifting duration to obtain the transmission ratio variation of the hydraulic transmission system.
8. The shift control device according to claim 6, wherein the obtaining unit, when obtaining the gear ratio change rate of the hydraulic transmission system, specifically includes:
acquiring the transmission ratio of the hydraulic transmission system at the previous moment, wherein the previous moment is the moment corresponding to a preset time interval before the current moment;
calculating the difference between the transmission ratio at the previous moment and the current transmission ratio to obtain a transmission ratio difference value;
and calculating the ratio of the transmission ratio difference to the preset time length to obtain the transmission ratio change rate of the hydraulic transmission system.
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| CN201911345043.2A CN111059277B (en) | 2019-12-24 | 2019-12-24 | Gear shifting control method and device |
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| US9206885B2 (en) * | 2013-12-31 | 2015-12-08 | Deere & Company | Multi-mode infinitely variable transmission |
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| EP2253867A1 (en) * | 2009-05-19 | 2010-11-24 | Heinz Aitzetmüller | Power split drive |
| CN103958252A (en) * | 2011-11-23 | 2014-07-30 | 卡特彼勒公司 | Method of effecting simultaneous displacement changes in hydrostatic drive machine |
| DE102014223950A1 (en) * | 2014-11-25 | 2016-05-25 | Zf Friedrichshafen Ag | Stepless wind power transmission with switchable power split |
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