CN115234644B - Gear control method and device for automatic gearbox of vehicle - Google Patents
Gear control method and device for automatic gearbox of vehicle Download PDFInfo
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- CN115234644B CN115234644B CN202210935748.5A CN202210935748A CN115234644B CN 115234644 B CN115234644 B CN 115234644B CN 202210935748 A CN202210935748 A CN 202210935748A CN 115234644 B CN115234644 B CN 115234644B
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- temperature value
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- automatic gearbox
- vehicle
- engine coolant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/74—Inputs being a function of engine parameters
- F16H59/78—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/74—Inputs being a function of engine parameters
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention provides a gear control method and a gear control device of an automatic transmission of a vehicle, wherein in the gear control method of the automatic transmission of the vehicle, an engine coolant temperature value of the vehicle and a first gear of the automatic transmission are obtained; and if the temperature value of the engine coolant meets the first preset condition and the first gear of the automatic gearbox meets the downshift condition, controlling the automatic gearbox to downshift. According to the invention, the gear of the automatic gearbox is controlled according to the temperature value of the engine coolant, and when the temperature of the engine coolant does not reach the limit temperature value, the automatic gearbox is downshifted, so that the cooling capacity of the whole vehicle is enhanced, the temperature of the engine coolant is reduced or the rising trend is slowed down, the triggering frequency of the temperature value of the engine coolant of the vehicle reaching the torque limit temperature value is reduced, and the influence on the running of the vehicle is reduced.
Description
Technical Field
The invention belongs to the technical field of vehicle control, and particularly relates to a gear control method and device of an automatic gearbox of a vehicle.
Background
The engine may be subjected to an excessive coolant temperature during operation of the vehicle, which may cause damage to the engine.
At present, when the temperature of engine coolant reaches a limit value, torque limitation is carried out on the engine so as to reduce work done by the engine, reduce heat generated by the engine and prevent the engine from being damaged. However, torque limiting the engine reduces vehicle operating power, affecting vehicle operation.
Disclosure of Invention
In view of the above, the present invention is directed to providing a method and apparatus for controlling an automatic transmission, which reduces the frequency of triggering a vehicle engine coolant temperature to reach a torque limit temperature value, and reduces the impact on the vehicle operation.
In order to achieve the above purpose, the embodiment of the invention discloses the following technical scheme:
A gear control method of an automatic transmission of a vehicle, comprising:
Acquiring an engine coolant temperature value of a vehicle and a first gear of an automatic gearbox;
And if the temperature value of the engine cooling liquid meets a first preset condition and the first gear of the automatic gearbox meets a downshift condition, controlling the automatic gearbox to downshift, wherein the first preset condition is that the temperature value of the engine cooling liquid is larger than or equal to the first temperature value and smaller than the second temperature value, and the downshift condition is that the first gear of the automatic gearbox is larger than or equal to 2 gears.
Optionally, the first preset condition further includes that a difference value between the engine coolant temperature value and the second temperature value is greater than or equal to a threshold value, and the controlling the automatic gearbox to downshift includes:
and controlling the automatic gearbox to descend by 1 gear.
Optionally, the first preset condition further includes that a difference between a coolant temperature value of the engine and the second temperature value is smaller than a threshold value, and the controlling the automatic gearbox to downshift includes:
Determining a target downshift gear number according to the engine coolant temperature value and a preset corresponding relation between the engine coolant temperature value and the target downshift gear number;
And controlling the automatic gearbox to reduce the gear according to the target reduction gear number.
Optionally, the controlling the automatic transmission to downshift includes:
Determining a second gear according to the engine coolant temperature value and a preset corresponding relation between the engine coolant temperature value and the second gear;
and controlling the automatic gearbox to descend to the second gear, wherein the second gear is lower than the first gear.
Optionally, the method further comprises:
And if the temperature value of the engine cooling liquid meets a second preset condition, controlling the automatic gearbox to ascend, wherein the second preset condition comprises that the temperature value of the engine cooling liquid is smaller than or equal to a third temperature value, and the third temperature value is smaller than the first temperature value.
Optionally, the controlling the automatic gearbox to up-shift includes:
And controlling the automatic gearbox to ascend to the first gear.
Optionally, the method further comprises: acquiring the running speed of the vehicle;
The controlling the automatic transmission up-shift position includes:
determining a third gear according to the vehicle running speed and a preset corresponding relation between the vehicle running speed and the third gear;
and controlling the automatic gearbox to ascend to the third gear.
A gear control device of an automatic transmission of a vehicle, comprising:
An acquisition unit, specifically configured to acquire an engine coolant temperature value of a vehicle and a first gear of an automatic transmission;
The first control unit is specifically configured to control the automatic gearbox to downshift if the temperature value of the engine coolant meets a first preset condition and the first gear of the automatic gearbox meets a downshift condition, where the first preset condition is that the temperature value of the engine coolant is greater than or equal to the first temperature value and less than the second temperature value, and the downshift condition is that the first gear of the automatic gearbox is greater than or equal to 2 gears.
A computer-readable storage medium having stored thereon a computer program that is executed by a processor to perform the steps of any one of the above-described gear control methods for an automatic transmission of a vehicle.
A terminal comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing any one of the steps of the gear control method for an automatic transmission of a vehicle described above when the computer program in the memory is invoked.
It can be seen that in the gear control method for an automatic transmission of a vehicle disclosed in the embodiment of the present invention, when it is determined whether the temperature value of the engine coolant meets the first preset condition, and the first gear of the automatic transmission meets the downshift condition, the automatic transmission is controlled to perform downshift. The gear of the automatic gearbox is controlled according to the temperature value of the engine coolant, when the temperature of the engine coolant does not reach the torque limiting temperature value, the automatic gearbox is downshifted, the engine speed can be increased after the downshift, so that the speeds of a fan and a water pump are increased, the cooling capacity of the whole vehicle is enhanced, the temperature of the engine coolant is reduced or the rising trend is slowed down, the triggering frequency of the temperature value of the engine coolant of the vehicle reaching the torque limiting temperature value is reduced, and the influence on the running of the vehicle is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a gear control method of an automatic transmission of a vehicle according to an embodiment of the present invention;
FIG. 2 is a flowchart of another gear control method for an automatic transmission of a vehicle provided by an embodiment of the present invention;
Fig. 3 is a schematic structural view of a gear control device of an automatic transmission of a vehicle according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to facilitate understanding of the technical solution provided by the present invention, the following description will first explain the background art related to the present invention.
The inventors have found that, at present, in order to prevent the engine from being damaged during the running of the vehicle, in order to prevent the coolant temperature of the engine from being too high. When the temperature of the engine coolant reaches a limit value, torque limitation is carried out on the engine so as to reduce work done by the engine and reduce heat generated by the engine, thereby protecting the engine. However, torque limiting the vehicle engine can affect the operation of the vehicle. For example, if the engine is torque limited during an uphill, the output power of the engine of the vehicle is reduced, thereby affecting the climbing ability of the vehicle and affecting the normal operation of the vehicle.
Based on this, the gear control method and device for the automatic transmission of the vehicle provided by the embodiment of the invention are used for obtaining the temperature value of the engine coolant of the vehicle and the first gear of the automatic transmission, and if the temperature value of the engine coolant meets a first preset condition and the first gear of the automatic transmission meets a downshift condition, the automatic transmission is controlled to downshift, wherein the first preset condition is that the temperature value of the engine coolant is greater than or equal to the first temperature value and is smaller than the second temperature value, and the downshift condition is that the first gear of the automatic transmission is greater than or equal to 2 gears. Therefore, the gear of the automatic gearbox is controlled according to the temperature value of the engine coolant, when the temperature of the engine coolant does not reach the torque limiting temperature value, the automatic gearbox is downshifted, the engine speed is increased after the downshifting, the cooling capacity of the whole vehicle is enhanced, the temperature of the engine coolant is reduced or the rising trend is slowed down, the triggering frequency of the temperature value of the engine coolant of the vehicle reaching the torque limiting temperature value is reduced, and the influence on the running of the vehicle is reduced.
In order to facilitate understanding of the technical scheme provided by the invention, the gear control method of the automatic transmission of the vehicle provided by the invention is described below with reference to the accompanying drawings.
Referring to fig. 1, the method for controlling a gear of an automatic transmission of a vehicle according to an embodiment of the present invention is shown in fig. 1, and includes S101-S102.
S101: an engine coolant temperature value of the vehicle is acquired, and a first gear of the automatic transmission is obtained.
Engine coolant, which is an integral part of a vehicle engine, circulates in an engine cooling system and can remove excess heat generated during engine operation to reduce the operating temperature of the engine. The temperature value of the engine coolant needs to be within a normal temperature range to ensure the normal operation of the engine.
The embodiment of the invention is not limited to the way of acquiring the temperature value of the cooling liquid of the vehicle engine. As an example, engine coolant temperature values from an automotive electronic control unit (Electronic Control Unit, ECU) are obtained over a controller area network (Controller Area Network, CAN) bus.
As an example, the operation of obtaining the temperature value of the engine coolant is performed in real time to ensure that the specific condition of the temperature value of the engine coolant can be accurately and timely obtained.
As an example, the process of obtaining the engine coolant temperature value may be performed immediately after the vehicle is started to ensure that the entire driving process of the vehicle may be effectively monitored.
The first gear of the automatic transmission refers to a gear of the vehicle in a current running state. It is understood that the automatic gearbox can automatically adjust gears according to the running state of the current vehicle, so that automatic gear shifting is realized. The running state of the vehicle may include a running speed of the vehicle. Of course, the invention is not limited thereto, and in other embodiments, there may be other choices of the running state of the vehicle.
The embodiment of the invention does not limit the acquisition mode for acquiring the first gear of the automatic gearbox. As one example, a first gear of an automatic transmission from an ECU is acquired through a CAN bus.
The embodiment of the application is not limited to a specific implementation manner of triggering and acquiring the first gear of the automatic gearbox. In one possible implementation, the first gear of the automatic transmission may be obtained in real time. In another possible implementation manner, the gear shift frequency of the automatic gearbox is low, and the first gear of the automatic gearbox can be periodically acquired, that is, the gear of the automatic gearbox is read once every a preset time interval, so that the data amount of the acquired first gear of the automatic gearbox is reduced, and therefore the data processing efficiency is improved.
In yet another possible implementation, after the engine coolant temperature value of the vehicle is obtained, it is determined that the engine coolant temperature value meets a first preset condition, at this time, a first gear of the automatic gearbox needs to be determined, and then the obtaining of the first gear of the automatic gearbox is performed. By acquiring the first gear of the automatic gearbox at this time, the data amount of the acquired first gear of the automatic gearbox can be reduced more effectively, so that the data processing efficiency is improved more effectively.
S102: and if the temperature value of the engine cooling liquid meets a first preset condition and the first gear of the automatic gearbox meets a downshift condition, controlling the automatic gearbox to downshift.
In the embodiment of the application, the first preset condition is that the temperature value of the engine coolant is greater than or equal to the first temperature value and less than the second temperature value. It is appreciated that the first temperature value may be the lowest temperature at which the engine coolant temperature is reduced and the second temperature value may be the engine torque limit temperature value, i.e., the engine is torque limited when this temperature value is reached. The first temperature value and the second temperature value may be preset according to actual needs, and in a possible implementation manner, the first temperature value may be 110 ℃, and the second temperature value may be 115 ℃. Of course, the present application is not limited thereto, and in other embodiments, the first temperature value and the second temperature value may have other choices.
The downshift condition may be that the gear of the automatic transmission is greater than or equal to 2, and it is understood that the downshift of the automatic transmission is only performed if the gear of the automatic transmission is greater than or equal to 2, and the downshift cannot be continued when the automatic transmission is in the lowest gear of 1.
In one possible implementation, the present invention further provides three specific implementations for controlling a downshift of an automatic transmission of a vehicle, see in particular below.
And when judging whether the temperature value of the engine cooling liquid meets the first preset condition and the first gear of the automatic gearbox meets the downshift condition, controlling the automatic gearbox to perform downshift. Therefore, the embodiment of the invention can control the gear of the automatic gearbox according to the temperature value of the engine coolant, when the temperature value of the engine coolant does not reach the limit temperature value, the automatic gearbox is downshifted, and the engine speed is increased after the downshift, so that the speeds of a fan and a water pump are increased, the cooling capacity of the whole vehicle is enhanced, the temperature of the engine coolant is reduced or the rising trend is slowed down, the triggering frequency of the temperature value of the engine coolant of the vehicle reaching the torque limit temperature value is reduced, and the influence on the running of the vehicle is reduced.
During operation of the vehicle, the influence of the engine coolant temperature on the vehicle is different under different temperature conditions. Different downshift control may be performed depending on different temperature conditions.
The embodiment of the invention also provides three downshifting modes, which are specifically as follows:
first kind: and controlling the automatic gearbox to descend by 1 gear.
In the first downshift method, the first preset condition further includes that the difference between the engine coolant temperature value and the second temperature value is greater than or equal to a threshold value, and the automatic gearbox is controlled to downshift by 1 gear if the condition is satisfied. It can be understood that the embodiment of the invention also judges whether the difference value between the temperature value of the engine coolant and the second temperature value is greater than the threshold value, and when the difference value between the temperature value of the engine coolant and the second temperature value is greater than the threshold value, the temperature value of the engine coolant and the second temperature value can be considered to have a larger difference, which indicates that the temperature value of the engine coolant is not high and is in a region which is not particularly dangerous. At the moment, the requirement of reducing the temperature value of the engine cooling liquid or slowing down the rising trend of the temperature of the engine cooling liquid can be met by controlling the automatic gearbox to descend by 1 gear.
Second kind: the automatic transmission is controlled to shift down according to the target shift down number of bits.
In the second downshift mode, the first preset condition further includes that the difference between the temperature value of the cooling liquid of the engine and the second temperature value is smaller than a threshold value, and then a target downshift gear corresponding to the cooling liquid of the engine is determined according to a preset corresponding relation between the temperature value of the cooling liquid of the engine and the target downshift gear, and the automatic gearbox is controlled to downshift according to the target downshift gear.
It can be understood that the embodiment of the invention further determines whether the difference between the engine coolant temperature value and the second temperature value is smaller than the threshold value, and when the difference between the engine coolant temperature value and the second temperature value is larger than the threshold value, it indicates that the engine coolant temperature value is very close to the engine torque limit temperature, and when the engine coolant temperature value is already very high, a stronger cooling capacity is required to meet the requirement of reducing the engine coolant temperature value or making the rising trend of the engine coolant temperature slow.
According to the preset corresponding relation between the temperature value of the engine cooling liquid and the target descending gear, the target descending gear corresponding to the engine cooling liquid is determined, the automatic gearbox is controlled to descend according to the target descending gear, a plurality of gears can be lowered at one time, the rotating speed of the engine is increased more, the rotating speeds of the fan and the water pump are increased more, and the cooling capacity of the whole vehicle is improved better. It will be appreciated that this embodiment is better suited for cooling when the engine coolant temperature is higher.
The preset correspondence between the engine coolant temperature value and the target downshift gear number is determined according to the multiparty conditions such as specific conditions, experience, test data and the like of the specific vehicle and the engine.
Third kind: and controlling the automatic gearbox gear to be lowered to the second gear.
In a third downshift mode, determining a second gear corresponding to the engine coolant temperature value according to a preset correspondence between the engine coolant temperature value and the second gear; the automatic gearbox is controlled to descend to a second gear, and the second gear is lower than the first gear.
It can be understood that the corresponding relation between the temperature value of the engine cooling liquid and the second gear can be preset, namely, when the temperature value of the engine cooling liquid reaches a specific temperature, the automatic gearbox can be directly controlled to descend to the second gear, and the second gear is lower than the first gear. In an alternative, the second gear may be 1, i.e. when the engine coolant temperature value reaches a dangerous temperature, the automatic gearbox is directly lowered to 1. Of course, the second gear may also have a plurality of gear selections, and only the second gear is required to be lower than the first gear. For example, the second gear may be 1 gear, 2 gear, or 3 gear, each gear corresponds to a different engine coolant temperature, and when the engine coolant temperature reaches the dangerous temperature, the gear of the automatic gearbox is directly reduced to 1 gear, or directly reduced to 2 gear, or directly reduced to 3 gear according to the engine coolant temperature value and the correspondence relationship between the engine coolant temperature value and the second gear.
The preset correspondence between the temperature value of the engine coolant and the second gear needs to be determined according to a plurality of conditions such as specific conditions, experience, test data and the like of the specific vehicle and the engine.
When the temperature value of the engine coolant with overhigh temperature is recovered to a normal temperature value in the running process of the vehicle, the automatic gearbox is required to be shifted up so as to ensure the subsequent normal running of the vehicle.
Referring to fig. 2, another gear control method for an automatic transmission of a vehicle according to an embodiment of the present invention is shown in fig. 2, and includes S101 to S103.
S101-S102 are described above and are not described in detail herein. The embodiment of the invention adds S103 on the basis of S101-S102: if the temperature value of the engine coolant meets a second preset condition, controlling the automatic gearbox to be in an ascending gear; the second preset condition includes the engine coolant temperature value being less than or equal to a third temperature value that is less than the first temperature value.
After the engine downshifts, the embodiment of the invention also judges whether the temperature value of the engine coolant meets a second preset condition, wherein the second preset condition comprises that the temperature value of the engine coolant is smaller than or equal to a third temperature value, and the third temperature value is smaller than the first temperature value. If so, controlling the automatic gearbox to be in an up-shift position. The third temperature value may be understood as the highest engine coolant temperature that is required to restore normal operation of the vehicle, and likewise, a specific value of the third temperature value may be set according to actual needs.
It can be understood that after the automatic gearbox is downshifted, the rotation speed of the engine is increased, so that the rotation speeds of the fan and the water pump are increased, the cooling capacity of the whole vehicle is enhanced, and the temperature value of the engine coolant is reduced or the rising trend is slowed down. That is, the present embodiment upshifts the automatic transmission when the engine coolant temperature value falls sufficiently low so that the vehicle resumes normal gear operation.
The embodiment of the invention also provides two upshift modes, which are specifically as follows:
In one upshift mode, the automatic transmission may be controlled to be upshifted to a first gear of the automatic transmission, the first gear being a gear of the vehicle when entering the gear control method. It can be understood that after the automatic gearbox downshifts, the temperature value of the engine coolant drops obviously, and the temperature of the upshift can be reached relatively quickly, so that the change of the running state such as the speed of the vehicle is relatively small, and the vehicle can be ensured to continue to normally run by returning to the first gear.
In another upshift mode, the running speed of the vehicle can be obtained, and the third gear corresponding to the running speed is determined according to the preset corresponding relation between the running speed of the vehicle and the third gear; and controlling the automatic gearbox to rise to the third gear. It can be understood that in the process of performing the downshift control, the temperature value of the engine coolant is slowly reduced, and a period of time is required to reach the temperature value required to increase the upshift of the automatic gearbox.
The corresponding relation between the running speed of the vehicle and the preset third gear is determined according to multiparty conditions such as specific conditions, experience, test data and the like of a specific vehicle and an engine.
The gear control method of the automatic transmission of the vehicle provided by the embodiment of the application is introduced, and the gear control method of the automatic transmission of the vehicle is exemplarily described below in combination with specific application scenes.
After the vehicle is started, the temperature of the engine coolant of the vehicle and the gear of the automatic gearbox can be obtained in real time, and the vehicle can be preset to be 110 ℃, 115 ℃ at the second temperature and 100 ℃ at the third temperature according to specific conditions.
If the temperature value of the engine cooling liquid obtained in real time reaches 110 ℃, the gear of the automatic gearbox is 3, the temperature value of the engine cooling liquid is in a state of needing to be cooled, and the automatic gearbox meets the downshift condition, so that the automatic gearbox can be controlled.
And a certain difference exists between the temperature value of the engine cooling liquid and the second temperature value at the moment, which means that the temperature value of the engine cooling liquid is not high yet and is in a zone which is not particularly dangerous, and at the moment, the automatic gearbox is controlled to be downshifted by 1.
The engine speed can be increased after the automatic gearbox descends by 1 gear, so that the speeds of a fan and a water pump are increased, the cooling capacity of the whole vehicle is enhanced, and the temperature of engine cooling liquid is reduced or the ascending trend is slowed down. In the process, the vehicle can also acquire the temperature value of the engine cooling liquid in real time, if the temperature of the engine cooling liquid is reduced to 100 ℃ through the downshift control, the temperature of the engine cooling liquid is indicated to be recovered to the normal water temperature, and the automatic gearbox is controlled to perform upshift at the moment, so that the vehicle keeps running normally.
The following describes a gear control device of an automatic transmission for a vehicle according to an embodiment of the present application, and the device described below and the gear control method of the automatic transmission for a vehicle described above may be referred to correspondingly.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a gear control device of an automatic transmission of a vehicle according to an embodiment of the present application, where the device may include:
the first acquisition unit 301 is specifically configured to acquire an engine coolant temperature value of the vehicle and a first gear of the automatic transmission.
The first control unit 302 is specifically configured to control the automatic gearbox to downshift if the temperature value of the engine coolant meets a first preset condition, and the first gear of the automatic gearbox meets a downshift condition, where the first preset condition is that the temperature value of the engine coolant is greater than or equal to the first temperature value and less than the second temperature value, and the downshift condition is that the first gear of the automatic gearbox is greater than or equal to 2 gears.
In one possible implementation manner, the first control unit further includes:
And the first control subunit is used for controlling the automatic gearbox to descend by 1 gear when the first preset condition further comprises that the difference value between the temperature value of the engine cooling liquid and the second temperature value is larger than or equal to a threshold value.
In one possible implementation manner, the first control unit further includes:
The first determining subunit is specifically configured to determine, when the first preset condition further includes that a difference between the coolant temperature value of the engine and the second temperature value is smaller than a threshold value, a target downshift gear according to the engine coolant temperature value and a preset correspondence between the engine coolant temperature value and the target downshift gear.
And the second control subunit is specifically used for controlling the automatic gearbox to lower the gear according to the target lower gear number.
In one possible implementation manner, the first control unit further includes:
the second determining subunit is specifically configured to determine a second gear according to the engine coolant temperature value and a preset corresponding relation between the engine coolant temperature value and the second gear;
And the third control subunit is specifically used for controlling the automatic gearbox to descend to the second gear, and the second gear is lower than the first gear.
In one possible implementation, the apparatus further includes:
The second control unit is specifically configured to control the automatic gearbox to upshift if the engine coolant temperature value meets a second preset condition, where the second preset condition includes that the engine coolant temperature value is less than or equal to a third temperature value, and the third temperature value is less than the first temperature value.
In one possible implementation manner, the second control unit further includes:
and the fourth control subunit is specifically used for controlling the automatic gearbox to ascend to the first gear.
In one possible implementation, the apparatus further includes: the second acquisition unit is specifically used for acquiring the running speed of the vehicle;
The second control unit further includes:
The third determining subunit is specifically configured to determine a third gear according to the vehicle running speed and a preset corresponding relation between the vehicle running speed and the third gear;
And a fifth control subunit, specifically configured to control the automatic gearbox to ascend to the third gear.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed, performs the steps provided by the above-described embodiments. The storage medium may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
It should be noted that, the computer readable storage medium provided in the embodiments of the present invention has the technical effects of any one of the embodiments described above, and the embodiments of the present invention are not described herein.
The application also provides a terminal, which can comprise a memory and a processor, wherein the memory stores a computer program, and the processor can realize the steps provided by the embodiment when calling the computer program in the memory. The terminal may of course also comprise various network interfaces, power supplies, etc.
It should be noted that, the terminal provided by the embodiment of the present invention has the technical effects of any one of the embodiments described above, and the embodiments of the present invention are not described herein.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (8)
1. A gear control method of an automatic transmission of a vehicle, characterized by comprising:
Acquiring an engine coolant temperature value of a vehicle and a first gear of an automatic gearbox;
If the temperature value of the engine cooling liquid meets a first preset condition and the first gear of the automatic gearbox meets a downshift condition, controlling the automatic gearbox to downshift, wherein the first preset condition is that the temperature value of the engine cooling liquid is larger than or equal to the first temperature value and smaller than the second temperature value, and the downshift condition is that the first gear of the automatic gearbox is larger than or equal to 2 gears; the controlling the automatic transmission to shift down includes: determining a second gear according to the engine coolant temperature value and a preset corresponding relation between the engine coolant temperature value and the second gear; controlling the automatic gearbox to descend to the second gear, wherein the second gear is lower than the first gear;
After the automatic gearbox downshifts, if the temperature value of the engine cooling liquid meets a second preset condition, the automatic gearbox is controlled to ascend, the second preset condition comprises that the temperature value of the engine cooling liquid is smaller than or equal to a third temperature value, and the third temperature value is smaller than the first temperature value.
2. The method of claim 1, wherein the first preset condition further comprises a difference between the engine coolant temperature value and the second temperature value being greater than or equal to a threshold value, the controlling the automatic transmission to downshift comprising:
and controlling the automatic gearbox to descend by 1 gear.
3. The method of claim 1, wherein the first preset condition further comprises a difference between a coolant temperature value of the engine and the second temperature value being less than a threshold, the controlling the automatic transmission to downshift comprising:
Determining a target downshift gear number according to the engine coolant temperature value and a preset corresponding relation between the engine coolant temperature value and the target downshift gear number;
And controlling the automatic gearbox to reduce the gear according to the target reduction gear number.
4. The method of claim 1, wherein said controlling the automatic transmission up-shift comprises:
And controlling the automatic gearbox to ascend to the first gear.
5. The method according to claim 1, wherein the method further comprises: acquiring the running speed of the vehicle;
The controlling the automatic transmission up-shift position includes:
determining a third gear according to the vehicle running speed and a preset corresponding relation between the vehicle running speed and the third gear;
and controlling the automatic gearbox to ascend to the third gear.
6. A gear control device of an automatic transmission for a vehicle, comprising:
a first acquisition unit, specifically configured to acquire an engine coolant temperature value of a vehicle and a first gear of an automatic transmission;
The first control unit is specifically configured to control the automatic gearbox to downshift if the temperature value of the engine coolant meets a first preset condition and the first gear of the automatic gearbox meets a downshift condition, where the first preset condition is that the temperature value of the engine coolant is greater than or equal to the first temperature value and less than the second temperature value, and the downshift condition is that the first gear of the automatic gearbox is greater than or equal to 2 gears;
The first control unit further includes: the second determining subunit is specifically configured to determine a second gear according to the engine coolant temperature value and a preset corresponding relation between the engine coolant temperature value and the second gear; a third control subunit, configured to specifically control the automatic gearbox to descend to the second gear, where the second gear is lower than the first gear;
And the second control unit is used for controlling the automatic gearbox to ascend if the temperature value of the engine cooling liquid meets a second preset condition after the automatic gearbox is downshifted, wherein the second preset condition comprises that the temperature value of the engine cooling liquid is smaller than or equal to a third temperature value, and the third temperature value is smaller than the first temperature value.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any of claims 1-5.
8. A terminal comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the steps of the method according to any of claims 1-5 when the computer program in the memory is invoked by the processor.
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| JPH11118030A (en) * | 1997-10-17 | 1999-04-30 | Kobe Steel Ltd | Transmission control method and control device for wheel crane |
| CN105114488A (en) * | 2015-09-09 | 2015-12-02 | 中国重汽集团济南动力有限公司 | Water temperature control method of AMT vehicle type hydraulic retarder and control system thereof |
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| US5680307A (en) * | 1995-06-28 | 1997-10-21 | Chrysler Corporation | Method of shifting in a manual mode of an electronically-controlled automatic transmission system |
| JP4120346B2 (en) * | 2001-12-07 | 2008-07-16 | トヨタ自動車株式会社 | Vehicle engine control device |
| JP2003329124A (en) * | 2002-05-10 | 2003-11-19 | Hino Motors Ltd | Transmission control device |
| JP4125067B2 (en) * | 2002-06-12 | 2008-07-23 | トヨタ自動車株式会社 | Shift control device for automatic transmission for vehicle |
| JP2010043584A (en) * | 2008-08-11 | 2010-02-25 | Toyota Motor Corp | Controller for vehicle |
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| JPH11118030A (en) * | 1997-10-17 | 1999-04-30 | Kobe Steel Ltd | Transmission control method and control device for wheel crane |
| CN105114488A (en) * | 2015-09-09 | 2015-12-02 | 中国重汽集团济南动力有限公司 | Water temperature control method of AMT vehicle type hydraulic retarder and control system thereof |
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