CN112303222A - Automatic transmission gear control method and system and vehicle - Google Patents
Automatic transmission gear control method and system and vehicle Download PDFInfo
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- CN112303222A CN112303222A CN202011297985.0A CN202011297985A CN112303222A CN 112303222 A CN112303222 A CN 112303222A CN 202011297985 A CN202011297985 A CN 202011297985A CN 112303222 A CN112303222 A CN 112303222A
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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
- F16H61/0202—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 electric
- F16H61/0204—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 electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—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 electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating 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
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/60—Inputs being a function of ambient conditions
- F16H59/66—Road conditions, e.g. slope, slippery
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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
- F16H59/60—Inputs being a function of ambient conditions
- F16H59/66—Road conditions, e.g. slope, slippery
- F16H2059/663—Road slope
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention relates to the technical field of automobiles, and particularly discloses a method and a system for controlling gears of an automatic transmission and a vehicle. The invention provides a gear control method of an automatic transmission, which comprises the following steps: acquiring road condition information, acquiring the current ground gradient, the ground gradient of the Nth meter ahead and the ground gradient of the Mth meter ahead according to the road condition information, and forming a terrain road section; pre-switching gears according to the terrain road sections; wherein M is greater than N. The automatic transmission gear control method provided by the invention can acquire the front road condition information in advance, and enables the vehicle transmission to be shifted up or down in advance according to the current road condition and the front road condition, so that the gear switching is carried out by judging the front road condition by human eyes, the labor intensity of a driver is reduced, the intellectualization of vehicle driving is improved, and the driving reliability is high.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a system for controlling gears of an automatic transmission and a vehicle.
Background
In recent years, with the rapid development of the transformation of the traditional mechanical transmission system by advanced electronic technical equipment, the automatic gearbox becomes more and more the standard configuration of the automobile, the gear shifting control method of the automatic transmission of the automobile has important influence on the dynamic property and the economical efficiency of the automobile, can obviously reduce the labor intensity of a driver, and has the advantages of high reliability, high transmission efficiency and the like.
At present, there is a great deal of research on the gear shifting control method of a stepped automatic transmission at home and abroad, and the method specifically comprises the following steps: the gear shifting control strategy based on fuzzy control, neural network and off-line data calculation has more application. In order to realize automatic gear shifting, certain (or some) parameters must be used as a control reference, and the parameters can be used for describing the requirements of the vehicle on various performances and use of the power transmission device and can be used as a basis for reasonably selecting gears. In the actual driving process, the road condition in front is generally recognized according to human eyes, a reaction is made in advance according to the change of the road condition, and the gear is shifted up or shifted down in advance, but certain deviation exists in artificial judgment, so that the problem of inaccurate gear control is caused.
Disclosure of Invention
The invention aims to provide a method and a system for controlling gears of an automatic transmission and a vehicle, which can accurately identify road condition information so as to accurately select the gears.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for controlling a gear of an automatic transmission, where the method includes:
acquiring road condition information, acquiring a current ground gradient, a ground gradient in the Nth meter ahead and a ground gradient in the Mth meter ahead according to the road condition information, and forming a terrain road section;
pre-switching gears according to the terrain road sections;
wherein M is greater than N.
In some embodiments, the terrain segments include level road segments, uphill bottom segments, uphill middle segments, hill top segments, downhill middle segments, and downhill bottom segments.
In some embodiments, the terrain segment is the level road segment when the current ground slope is greater than-0.8% and less than 0.8%, the ground slope N meters ahead is greater than-0.8% and less than 0.8%, and the ground slope M meters ahead is greater than-0.8% and less than 0.8%;
when the current ground slope is more than-0.8% and less than 1.5%, and the ground slope of the Mth meter ahead is more than 1.0%, the terrain road section is the uphill bottom road section;
when the current ground gradient is greater than 1.2%, the terrain road section is the uphill middle road section;
when the current ground slope is greater than-0.8% and less than 1.5%, the ground slope of the Nth meter ahead is less than 1.0%, and the ground slope of the Mth meter ahead is less than-1.2%, the terrain road section is the top of the slope;
when the current ground gradient is less than-1.2%, the road section is a downhill middle road section;
the current ground slope is larger than-1.5% and smaller than 1.0%, the slope of the Nth meter ahead is larger than-0.8%, the slope of the Mth meter ahead is larger than-0.8%, and the terrain road section is a downhill bottom road section.
In some embodiments, pre-switching the gear according to the terrain section comprises:
and when the vehicle is positioned on the uphill bottom road section, calculating the downshift compensation rotating speed according to the ground slope of the Mth meter ahead, judging whether the rotating speed of the vehicle engine is less than the sum of the downshift rotating speed and the downshift compensation rotating speed, and if so, downshifting the vehicle transmission.
In some embodiments, pre-switching the gear according to the terrain section comprises:
and when the vehicle is positioned on the slope top road section, calculating the upshift compensation rotating speed according to the current ground slope of the slope top road section, judging whether the rotating speed of the vehicle engine is greater than the difference between the upshift rotating speed and the upshift compensation rotating speed, and if so, upshifting the vehicle transmission.
In some embodiments, pre-switching the gear according to the terrain section comprises:
and when the vehicle is positioned on the downhill bottom road section, calculating the upshift compensation rotating speed according to the current ground gradient of the downhill bottom road section, judging whether the rotating speed of the vehicle engine is greater than the difference between the upshift rotating speed and the upshift compensation rotating speed, and if so, upshifting the vehicle transmission.
In some embodiments, the vehicle may be capable of coasting in neutral if the slope of the ground N meter forward is greater than-2.5% and the slope of the ground M meter forward is greater than-2.5% while the vehicle is on the downhill center section.
In some embodiments, when the vehicle is on the top of the hill section, whether the vehicle can slide in neutral is determined according to the current ground gradient and the opening degree of an accelerator pedal.
In a second aspect, an automatic transmission range control system, comprising:
the information acquisition module is used for acquiring road condition information;
the speed changer controller is used for acquiring the current ground gradient, the ground gradient in the Nth meter ahead and the ground gradient in the Mth meter ahead according to the road condition information, forming a terrain road section and controlling the speed changer to switch gears in advance according to the terrain road section;
wherein M is greater than N.
In a third aspect, a vehicle includes:
a controller;
a memory for storing one or more programs;
the one or more programs, when executed by the controller, cause the controller to implement the automatic transmission gear control method according to the first aspect.
The invention has the beneficial effects that: the automatic transmission gear control method provided by the invention can acquire the front road condition information in advance, and enables the vehicle transmission to be shifted up or down in advance according to the current road condition and the front road condition, so that the gear switching is carried out by judging the front road condition by human eyes, the labor intensity of a driver is reduced, the intellectualization of vehicle driving is improved, and the driving reliability is high.
Drawings
FIG. 1 is a flow chart of a method for controlling a gear of an automatic transmission according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a terrain road segment provided in accordance with an embodiment of the present invention;
FIG. 3 is a block diagram of a shift control system of an automatic transmission according to a second embodiment of the present invention;
fig. 4 is a structural diagram of a vehicle according to a third embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example one
As shown in fig. 1, the present embodiment provides an automatic transmission gear control method, where the automatic transmission gear control method disclosed in the present embodiment is applied to an automatic transmission gear control system, the control system may be implemented by software and/or hardware, and is integrated in a vehicle, and specifically, the control method includes the following steps:
and S1, acquiring road condition information.
Specifically, the vehicle-mounted T-BOX can acquire the current and the front road condition information according to the map information, so that the acquisition of the front road condition information through human eyes is replaced, and the labor intensity of a driver is reduced.
S2, acquiring the current ground gradient, the ground gradient of the Nth meter ahead and the ground gradient of the Mth meter ahead according to the road condition information and forming a terrain road section; wherein M is greater than N.
Specifically, in the present embodiment, as shown in fig. 2, the topographic section includes a level road section, an uphill bottom section, an uphill middle section, a hill top section, a downhill middle section, and a downhill bottom section. The terrain road sections basically cover various road conditions, and the driving reliability and control accuracy of the vehicle are ensured.
Further, since different road sections have different slopes, each road section is defined according to the slope parameter to ensure that the vehicle can shift gears accurately, and each road section is divided as follows:
the road section is the level road section when the current ground gradient is more than-0.8% and less than 0.8%, the ground gradient of the Nth meter ahead is more than-0.8% and less than 0.8%, and the ground gradient of the Mth meter ahead is more than-0.8% and less than 0.8%.
When the current ground slope is more than-0.8% and less than 1.5%, and the ground slope of the Mth meter ahead is more than 1.0%, the road section is the uphill bottom road section.
And when the gradient of the current ground is more than 1.2%, the current ground is the section in the uphill.
The slope top road section is determined when the current ground slope is more than-0.8% and less than 1.5%, the ground slope of the Nth meter ahead is less than 1.0% and the ground slope of the Mth meter ahead is less than-1.2%.
When the current ground gradient is less than-1.2%, the road section is in the downhill.
When the gradient of the current ground is more than-1.5% and less than 1.0%, the gradient of the Nth meter ahead is more than-0.8% and the gradient of the Mth meter ahead is more than-0.8%, the road section is the downhill bottom road section.
The gradient percentage is expressed as a percentage of a tangent function of a trigonometric function, i.e., a percentage of a height difference between two points and a horizontal distance thereof, and is calculated as follows: slope (height difference/horizontal distance) × 100%, when expressed in percent, i.e.: i is h/l × 100%. The positive gradient value indicates the gradient value of an ascending slope, and the negative gradient value indicates the gradient value of a descending slope.
The above N is preferably 200, and M is preferably 400.
And S3, switching the gears in advance according to the terrain road sections.
Specifically, according to the current road section information of the vehicle and the road section information in front, gear information of the transmission is switched in advance, so that the fact that people judge the road condition in front to switch gears is replaced, the intelligence of vehicle driving is improved, and the driving reliability is high.
When the vehicle is in an uphill bottom road section, calculating a downshift compensation rotating speed according to the ground gradient of the Mth meter ahead, judging whether the rotating speed of the vehicle engine is less than the sum of the downshift rotating speed and the downshift compensation rotating speed, and if so, downshifting the vehicle transmission to enable the vehicle engine to have enough power to climb the uphill. The downshift compensation speed is 25 × the front mth ground gradient coefficient k1, the coefficient k1 is determined according to a gradient value look-up table, and when the front mth ground gradient value is [ -6% -4% -2% 02% 4% 6% ], the corresponding k is [ 00004812 ].
When the vehicle is located on a slope top road section, calculating the upshift compensation rotating speed according to the ground gradient of the current slope top road section, judging whether the rotating speed of the vehicle engine is greater than the difference between the upshift rotating speed and the upshift compensation rotating speed, and if so, upshifting the vehicle transmission to enable the vehicle engine to have higher rotating speed and improve the running speed of the vehicle. The upshift compensation speed is 10 × the current ground gradient coefficient k2, and the coefficient k2 is determined from a slope value table, and illustratively, when the current ground gradient value is [ -2% -1% 01% 2% ], the corresponding k is [ 252015105 ].
When the vehicle is in the downhill bottom road section, calculating the upshift compensation rotating speed according to the ground gradient of the current downhill bottom road section, judging whether the rotating speed of the vehicle engine is greater than the difference between the upshift rotating speed and the upshift compensation rotating speed, and if so, upshifting the vehicle transmission. The upshift compensation speed is 25 × the current ground gradient coefficient k3, and when the current ground gradient value is [ -2% -1% 01% 2% ], the corresponding k is [ 252015105 ].
When the vehicle is on an uphill road section and a downhill road section, the vehicle does not shift gears in advance in order to ensure the safety of the vehicle in driving. And when the vehicle is positioned on the uphill bottom road section and the uphill middle road section, the vehicle is not allowed to slide in a neutral gear.
However, when the vehicle is located on a road section on the top of a slope, whether the vehicle can slide in a neutral gear or not needs to be determined according to the current ground gradient and the opening degree of the accelerator pedal, and if the current ground gradient meets the requirement of the sliding in the neutral gear and the opening degree of the accelerator pedal is 0, the vehicle can slide in the neutral gear, so that energy is saved.
When the vehicle is in a downhill section, if the slope of the ground at the Nth meter ahead is greater than-2.5% and the slope of the ground at the Mth meter ahead is greater than-2.5%, the vehicle can slide in a neutral position; if the slope of the ground at the Nth meter ahead is less than or equal to-2.5 percent or the slope of the ground at the Mth meter ahead is less than or equal to-2.5 percent, the vehicle cannot slide in a neutral gear, and the running safety of the vehicle is ensured.
Example two
As shown in fig. 3, the present embodiment provides an automatic transmission gear control system, which can execute the automatic transmission gear control method in the first embodiment, and specifically, the system includes:
the information obtaining module 310 is configured to obtain the traffic information.
The transmission controller 320 is used for acquiring the current ground gradient, the ground gradient of the Nth meter ahead and the ground gradient of the Mth meter ahead according to the road condition information, forming a terrain road section, and controlling the transmission to switch gears in advance according to the terrain road section;
wherein M is greater than N.
The information obtaining module 310 provided in this embodiment is used to obtain the traffic information, instead of obtaining the traffic information through human eyes, so as to improve the accuracy of information identification. The information obtaining module 310 transmits the obtained road condition information to the transmission controller 320, the transmission controller 320 obtains the ground slopes of different distance nodes according to the road condition information to form a topographic road section, and the transmission controller 320 controls the transmission to switch gears in advance according to the topographic road section.
On the basis of the above embodiment, the information acquisition module 310 includes the vehicle-mounted T-BOX, and acquires the current and previous traffic information through the vehicle-mounted T-BOX, thereby improving the accuracy of traffic determination.
EXAMPLE III
As shown in fig. 4, the present embodiment provides a vehicle including a controller 410 and a memory 420.
The memory 420 serves as a computer-readable storage medium that may be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the automatic transmission gear control methods of embodiments of the present invention. The controller 410 executes various functional applications and data processing of the vehicle by executing software programs, instructions and modules stored in the memory 420, that is, implements the automatic transmission gear control method of the above-described embodiment.
The memory 420 mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system and an application program required by at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 420 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 420 may further include memory located remotely from the controller 410, which may be connected to the vehicle over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The vehicle provided by the third embodiment of the invention and the automatic transmission gear control method provided by the above embodiment belong to the same inventive concept, and the technical details which are not described in detail in the present embodiment can be referred to the above embodiment, and the present embodiment has the same beneficial effects as the automatic transmission gear control method.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method of controlling a gear of an automatic transmission, the method comprising:
acquiring road condition information, acquiring a current ground gradient, a ground gradient in the Nth meter ahead and a ground gradient in the Mth meter ahead according to the road condition information, and forming a terrain road section;
pre-switching gears according to the terrain road sections;
wherein M is greater than N.
2. The automatic transmission gear control method according to claim 1, characterized in that the topographic sections include a level road section, an uphill bottom section, an uphill middle section, a hill top section, a downhill middle section, and a downhill bottom section.
3. The automatic transmission gear control method according to claim 2, characterized in that the open road section is the current ground slope greater than-0.8% and less than 0.8%, the ground slope of the nth meter ahead is greater than-0.8% and less than 0.8%, and the ground slope of the mth meter ahead is greater than-0.8% and less than 0.8%;
the slope of the current ground is more than-0.8% and less than 1.5%, and the slope of the ground at the Mth meter ahead is more than 1.0% of the slope of the uphill bottom road section;
when the current ground gradient is greater than 1.2%, the current ground gradient is the section in the uphill;
the slope top section is determined when the current ground slope is greater than-0.8% and less than 1.5%, the ground slope of the Nth meter ahead is less than 1.0% and the ground slope of the Mth meter ahead is less than-1.2%;
when the current ground gradient is less than-1.2%, the road section in the downhill is determined;
and when the gradient of the current ground is more than-1.5% and less than 1.0%, the gradient of the Nth meter ahead is more than-0.8%, and the gradient of the Mth meter ahead is more than-0.8%, the downhill bottom section is determined.
4. The automatic transmission shift control method according to claim 2, wherein the shifting the shift position in advance according to the topographic section includes:
and when the vehicle is positioned on the uphill bottom road section, calculating a downshift compensation rotating speed according to the ground gradient of the Mth meter ahead, judging whether the rotating speed of the vehicle engine is less than the sum of the downshift rotating speed and the downshift compensation rotating speed, and if so, downshifting the vehicle transmission.
5. The automatic transmission shift control method according to claim 2, wherein the shifting the shift position in advance according to the topographic section includes:
and when the vehicle is positioned on the slope top road section, calculating the upshift compensation rotating speed according to the current ground gradient of the slope top road section, judging whether the rotating speed of the vehicle engine is greater than the difference between the upshift rotating speed and the upshift compensation rotating speed, and if so, upshifting the vehicle transmission.
6. The automatic transmission shift control method according to claim 2, wherein the shifting the shift position in advance according to the topographic section includes:
and when the vehicle is positioned at the downhill bottom road section, calculating the upshift compensation rotating speed according to the current ground gradient of the downhill bottom road section, judging whether the rotating speed of the vehicle engine is greater than the difference between the upshift rotating speed and the upshift compensation rotating speed, and if so, upshifting the vehicle transmission.
7. The automatic transmission gear control method according to claim 2, characterized in that when the vehicle is on the downhill middle section, the vehicle can coast in neutral if the ground gradient N M ahead is greater than-2.5% and the ground gradient M ahead is greater than-2.5%.
8. The automatic transmission range control method of claim 2, wherein when a vehicle is on the hill top section, determining whether the vehicle can coast in neutral based on the current ground grade and an accelerator pedal opening.
9. An automatic transmission range control system, comprising:
the information acquisition module is used for acquiring road condition information;
the speed changer controller is used for acquiring the current ground gradient, the ground gradient in the Nth meter ahead and the ground gradient in the Mth meter ahead according to the road condition information, forming a terrain road section and controlling the speed changer to switch gears in advance according to the terrain road section;
wherein M is greater than N.
10. A vehicle, characterized by comprising:
a controller;
a memory for storing one or more programs;
the one or more programs, when executed by the controller, cause the controller to implement the automatic transmission range control method of any of claims 1-8.
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| CN115419707A (en) * | 2022-08-30 | 2022-12-02 | 长城汽车股份有限公司 | Control method and device for gear-shifting of gearbox, vehicle and storage medium |
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| CN112303222B (en) | 2022-04-19 |
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