CN115949738A - AMT gear shifting control method and system and vehicle - Google Patents
AMT gear shifting control method and system and vehicle Download PDFInfo
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- CN115949738A CN115949738A CN202310224786.4A CN202310224786A CN115949738A CN 115949738 A CN115949738 A CN 115949738A CN 202310224786 A CN202310224786 A CN 202310224786A CN 115949738 A CN115949738 A CN 115949738A
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Abstract
The invention relates to the field of vehicles and discloses an AMT gear shifting control method, a control system and a vehicle, wherein the pre-stored theoretical rotating speed of each AMT gear shifting engine is corrected based on the magnitude relation between the actual temperature of engine coolant and a preset temperature limit value to obtain the corresponding target rotating speed of the AMT gear shifting engine, the AMT is controlled to shift gears based on the actual rotating speed of the engine and the target rotating speed of the AMT gear shifting engine, the temperature and the flow of the engine coolant are adjusted, and compared with the method for controlling the AMT to shift gears based on the actual rotating speed of the engine and the pre-stored theoretical rotating speed of the AMT gear shifting engine, the unfreezing time can be shortened by 15%.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to an AMT gear shifting control method, an AMT gear shifting control system and a vehicle.
Background
The urea injection system is a standard configuration of an engine and includes a urea tank for storing a urea solution, a urea pump for delivering the urea solution in the urea tank to a urea nozzle for injecting the urea solution into the aftertreatment system, and a urea nozzle.
When the temperature is lower, the phenomenon of freezing can appear in the urea solution in the urea case, and the current thawing mode adopts the engine coolant to carry out the convection heat transfer thawing to the urea solution that freezes. However, tests prove that the method has the problem of long unfreezing time, and particularly the unfreezing time is longer in the process of heating the vehicle after the engine is cold started.
Disclosure of Invention
The invention aims to provide an AMT gear shifting control method, an AMT gear shifting control system and a vehicle, which can further shorten the defrosting time of urea liquid.
In order to achieve the purpose, the invention adopts the following technical scheme:
the AMT gear-shifting control method comprises the following steps of when a unfreezing instruction for unfreezing urea liquid is received, adopting engine cooling liquid to unfreeze the urea liquid through convective heat transfer, and executing the following steps:
when the actual temperature of the engine coolant is lower than a preset temperature limit value, correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is lower than the theoretical rotating speed of the corresponding AMT gear-shifting engine;
when the actual temperature of the engine coolant is not lower than a preset temperature limit value, correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine;
and acquiring the actual rotating speed of the engine, and controlling the AMT to shift gears based on the actual rotating speed of the engine and the target rotating speed of the AMT gear-shifting engine.
As an optimal technical solution of the AMT gear shift control method, the method for correcting the theoretical rotation speed of each pre-stored AMT gear shift engine to obtain the target rotation speed of the AMT gear shift engine smaller than the theoretical rotation speed of the corresponding AMT gear shift engine includes:
the AMT gear-shifting engine target rotating speed = AMT gear-shifting engine theoretical rotating speed-first preset correction value, and the first preset correction value is larger than zero.
As a preferable technical solution of the AMT gear shift control method, the first preset correction value is obtained according to the following steps:
and inquiring the gear shifting correction rotating speed corresponding to the actual temperature of the engine coolant on the basis of the corresponding relation between the temperature of the engine coolant and the gear shifting correction rotating speed, and taking the inquired gear shifting correction rotating speed as the first preset correction value.
As an optimal technical solution of the AMT gear shift control method, the method corrects the theoretical rotation speed of each pre-stored AMT gear shift engine to obtain the target rotation speed of the AMT gear shift engine greater than the theoretical rotation speed of the corresponding AMT gear shift engine, and includes:
the AMT gear-shifting engine target rotating speed = AMT gear-shifting engine theoretical rotating speed + a second preset correction value, and the second preset correction value is larger than zero.
As a preferable technical solution of the AMT gear shift control method, the second preset correction value is obtained according to the following steps:
and inquiring the gear shifting correction rotating speed corresponding to the actual temperature of the urea box based on the corresponding relation between the temperature of the urea box and the gear shifting correction rotating speed, and taking the inquired gear shifting correction rotating speed as the second preset correction value.
In order to achieve the above object, the present invention further provides an AMT gear shifting control system for implementing the AMT gear shifting control method according to any one of the above aspects, the AMT gear shifting control system comprising:
the unfreezing control module is used for controlling the engine cooling liquid to carry out convective heat transfer unfreezing on the urea liquid when a unfreezing instruction for unfreezing the urea liquid is received;
the gear shifting parameter pre-storing module is used for pre-storing theoretical rotating speeds of a plurality of AMT gear shifting engines;
the cooling liquid temperature acquisition module is used for acquiring the actual temperature of the engine cooling liquid;
the judging module is used for judging whether the actual temperature of the engine cooling liquid is lower than a preset temperature limit value or not in the process that the unfreezing control module adopts the engine cooling liquid to carry out convective heat transfer unfreezing on the urea liquid;
the rotating speed determining module is used for correcting the prestored theoretical rotating speed of each AMT gear-shifting engine when the actual temperature of the engine cooling liquid is lower than the preset temperature limit value, so as to obtain the target rotating speed of the AMT gear-shifting engine, which is lower than the theoretical rotating speed of the corresponding AMT gear-shifting engine; the method is also used for correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine when the actual temperature of the engine cooling liquid is not lower than the preset temperature limit value, so as to obtain the target rotating speed of the AMT gear-shifting engine which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine;
the engine rotating speed acquisition module is used for acquiring the actual rotating speed of the engine;
and the gear shifting control module is used for controlling the AMT to shift gears based on the actual rotating speed of the engine and the AMT gear shifting engine target rotating speed.
As a preferable technical solution of the AMT gear shift control system, the rotation speed determining module includes:
the first correction calculation unit is used for calculating a target rotating speed of each AMT gear-shifting engine when the actual temperature of the engine cooling liquid is lower than the preset temperature limit value, wherein the target rotating speed of the AMT gear-shifting engine = AMT gear-shifting engine theoretical rotating speed-a first preset correction value, and the first preset correction value is larger than zero;
and the second correction calculation unit is used for calculating the target rotating speed of each AMT gear-shifting engine when the actual temperature of the engine coolant is not lower than the preset temperature limit value, wherein the target rotating speed of the AMT gear-shifting engine = AMT gear-shifting engine theoretical rotating speed + a second preset correction value, and the second preset correction value is larger than zero.
As a preferable technical solution of the AMT gear shift control system, the rotation speed determining module further includes:
the first correction prestoring unit is used for prestoring the corresponding relation between the temperature of the engine cooling liquid and the AMT gear-shifting engine rotating speed correction value;
a first correction value determination unit configured to query a shift correction rotation speed corresponding to an actual temperature of the engine coolant based on a correspondence relationship between the temperature of the engine coolant and the shift correction rotation speed, and to use the queried shift correction rotation speed as a first preset correction value.
As a preferable technical solution of the AMT gear shift control system, the rotation speed determining module further includes:
the urea box temperature acquisition unit is used for acquiring the actual temperature of the urea box;
the second correction pre-storing unit is used for pre-storing the corresponding relation between the temperature of the urea box and the gear shifting correction rotating speed;
and the second correction value determining unit is used for inquiring the gear shifting correction rotating speed corresponding to the actual temperature of the urea box based on the corresponding relation between the temperature of the urea box and the gear shifting correction rotating speed, and taking the inquired gear shifting correction rotating speed as a second preset correction value.
In order to achieve the above object, the present invention further provides a vehicle including the AMT shift control system according to any one of the above aspects.
The invention has the beneficial effects that: according to the AMT gear shifting control method, the AMT gear shifting control system and the AMT gear shifting control vehicle, if the actual temperature of the engine cooling liquid is lower than the preset temperature limit value, the urea thawing effect is poor when the urea liquid is thawed through convective heat transfer of the engine cooling liquid. Through revising every AMT engine theory rotational speed that shifts that prestores, obtain being less than the AMT engine target rotational speed that shifts that corresponds AMT engine theory rotational speed that shifts, and shift gears based on actual rotational speed and AMT engine target rotational speed control AMT of engine, can realize the same engine speed, AMT moves in higher fender position, thereby realize keeping off the position higher that AMT moved under the whole car same power demand, and required engine speed under having reduced the demand under the same power, in order to improve the load factor, make engine coolant liquid temperature promote fast, thereby it is long to shorten when utilizing engine coolant liquid to carry out the convective heat transfer thawing to urea liquid under the mode of shifting that unfreezes.
If the actual temperature of the engine coolant is not lower than the preset temperature limit value, at the moment, the unfreezing effect when the urea liquid is subjected to convective heat transfer unfreezing through the engine coolant is good, the theoretical rotating speed of each pre-stored AMT gear-shifting engine is corrected to obtain the AMT gear-shifting engine target rotating speed which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine, the AMT is controlled to shift gears based on the actual rotating speed of the engine and the AMT gear-shifting engine target rotating speed, the same engine rotating speed can be achieved, the AMT runs at a lower gear, the gear of the AMT runs at the same power requirement of the whole vehicle is lower, the engine rotating speed required under the same power requirement is increased, the rotating speed of a water pump driven by the engine is increased, the flow of the coolant flowing through the urea box is increased, and the unfreezing duration required when the engine coolant is used for convective heat transfer unfreezing of the urea liquid in the unfreezing gear-shifting mode is shortened.
According to the method, the prestored theoretical rotating speed of each AMT gear-shifting engine is corrected based on the magnitude relation between the actual temperature of the engine cooling liquid and the preset temperature limit value, the corresponding target rotating speed of the AMT gear-shifting engine is obtained, the AMT is controlled to shift gears based on the actual rotating speed of the engine and the target rotating speed of the AMT gear-shifting engine, the temperature and the flow of the engine cooling liquid are adjusted, and compared with the method that the AMT is controlled to shift gears based on the actual rotating speed of the engine and the prestored theoretical rotating speed of the AMT gear-shifting engine, the unfreezing time can be shortened by 15%.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a flowchart of an AMT shift control method in a defrost mode provided by an embodiment of the present invention;
fig. 2 is a block diagram of an AMT shift control system according to an embodiment of the present invention.
In the figure:
100. a thawing control module; 200. a gear shifting parameter pre-storing module; 300. a coolant temperature acquisition module; 400. a judgment module;
500. a rotation speed determination module; 501. a first correction calculation unit; 502. a second correction calculation unit; 503. a first correction pre-storing unit; 504. a first correction value determination unit; 505. a urea tank temperature acquisition unit; 506. a second correction pre-storing unit; 507. a second correction value determination unit;
600. an engine speed acquisition module; 700. and a gear shifting control module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
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 a specific case to those of ordinary skill 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. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The embodiment provides an AMT gear shift control method to solve the technical problem. The AMT gear shift control method may be executed by an AMT gear shift control system, which may be implemented in software and/or hardware, and integrated in a vehicle.
Among them, AMT is called Automated Mechanical Transmission in english and is called automatic Mechanical automatic Transmission in chinese. The AMT includes a shift input shaft for connecting an engine output shaft, a shift input gear, a shift gear correspondingly disposed to the shift input gear, and a shift driving mechanism for driving the shift input gear to be connected to or separated from the corresponding shift gear, the shift driving mechanism may be a hydraulic driving mechanism or a mechanical mechanism, and the specific structure of the AMT is the prior art in the field and is not described in detail herein.
The gear shifting modes of the AMT gear shifting control method are two, namely a conventional gear shifting mode and a unfreezing gear shifting mode, and the conventional gear shifting mode is executed when a unfreezing instruction for unfreezing urea solution is not received; and executing a unfreezing gear shifting mode when a unfreezing command for unfreezing the urea solution is received.
Under the conventional gear shifting mode, the target rotating speed of the AMT gear shifting engine corresponds to and is equal to the theoretical rotating speed of the AMT gear shifting engine one by one, and the AMT is controlled to shift gears based on the actual rotating speed of the engine and the theoretical rotating speed of the AMT gear shifting engine.
The technology of controlling the AMT to shift gears based on the actual rotation speed of the engine and the theoretical rotation speed of the AMT-shifted engine is the prior art in the field, and a gear shifting strategy for controlling the AMT to shift gears based on the actual rotation speed of the engine and the theoretical rotation speed of the AMT-shifted engine is briefly introduced below.
The AMT has two at least fender position, and AMT shifts gear engine theoretical rotational speed includes that AMT upshifts engine theoretical rotational speed and AMT downshifts engine theoretical rotational speed, and in two adjacent fender position, it is greater than by the required AMT downshifting engine theoretical rotational speed that great fender position rose to great fender position than and is reduced to less fender position required AMT downshifting engine theoretical rotational speed by great fender position.
Taking the example that the AMT has the fifth gear, for convenience of description, the five gears of the AMT are respectively marked as the first gear, the second gear, the third gear, the fourth gear and the fifth gear according to the sequence of gears from small to large.
And controlling the AMT to be in the first gear when the actual rotating speed of the engine is smaller than the theoretical rotating speed of the AMT for increasing from the first gear to the second gear in the process of increasing the actual rotating speed of the engine.
And in the process of reducing the actual rotating speed of the engine, controlling the AMT to be in the first gear when the actual rotating speed of the engine is smaller than the AMT downshift engine theoretical rotating speed required by the second gear to be shifted to the first gear.
And in the process of increasing the actual rotating speed of the engine, when the actual rotating speed of the engine is between the theoretical rotating speed of the AMT upshifted engine required by the engine to be shifted from the minimum gear to the intermediate gear in the three adjacent gears and the theoretical rotating speed of the AMT upshifted engine corresponding to the engine to be shifted from the intermediate gear to the maximum gear, controlling the AMT to be in the intermediate gear.
And in the process of reducing the actual rotating speed of the engine, when the actual rotating speed of the engine is between the theoretical rotating speed of the AMT downshift engine required by reducing the actual rotating speed of the engine from the middle gear to the minimum gear in three adjacent gears and the theoretical rotating speed of the AMT downshift engine required by reducing the actual rotating speed of the engine from the maximum gear to the middle gear, controlling the AMT to be in the middle gear.
And in the process of increasing the actual rotating speed of the engine, controlling the AMT to be in the fifth gear when the actual rotating speed of the engine is greater than the theoretical rotating speed of the AMT upshifted engine required by the fourth gear to the fifth gear.
And in the process of reducing the actual rotating speed of the engine, controlling the AMT to be in the fifth gear when the actual rotating speed of the engine is larger than the theoretical rotating speed of the AMT downshift engine required by the downshift from the fifth gear to the fourth gear.
In the unfreezing mode, the urea liquid is unfrozen by adopting the engine cooling liquid through convective heat transfer, and the following steps are executed:
when the actual temperature of the engine cooling liquid is lower than a preset temperature limit value, correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is lower than the theoretical rotating speed of the corresponding AMT gear-shifting engine;
when the actual temperature of the engine coolant is not lower than a preset temperature limit value, correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine;
and acquiring the actual rotating speed of the engine, and controlling the AMT to shift gears based on the actual rotating speed of the engine and the target rotating speed of the AMT gear-shifting engine.
According to the AMT gear shifting control method provided by the embodiment, based on the size relation between the actual temperature of the engine cooling liquid and the preset temperature limit value, the theoretical rotating speed of each pre-stored AMT gear shifting engine is corrected to obtain the corresponding target rotating speed of the AMT gear shifting engine, the AMT gear shifting is controlled based on the actual rotating speed of the engine and the target rotating speed of the AMT gear shifting engine, the temperature and the flow of the engine cooling liquid are adjusted, and compared with the method that the AMT gear shifting is controlled based on the actual rotating speed of the engine and the pre-stored theoretical rotating speed of the AMT gear shifting engine, the unfreezing time can be shortened by 15%.
Fig. 1 is a flowchart of an AMT shift control method in the thawing mode provided in this embodiment, and the AMT shift control method in the thawing mode is described below with reference to fig. 1.
S101, when a unfreezing command for unfreezing the urea solution is received, the engine cooling liquid is adopted to conduct convective heat transfer unfreezing on the urea solution.
S102, judging whether the actual temperature of the engine cooling liquid is lower than a preset temperature limit value, if so, executing S103, and if not, executing S104.
S103, correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is less than the theoretical rotating speed of the corresponding AMT gear-shifting engine; then S106 is executed.
If the actual temperature of the engine coolant is lower than the preset temperature limit value, at the moment, the urea thawing effect is poor when the urea liquid is thawed by the engine coolant through convective heat transfer. Through revising every AMT engine theory rotational speed that shifts that prestores, obtain being greater than the AMT engine target rotational speed that shifts that corresponds AMT engine theory rotational speed that shifts, and shift gears based on the actual rotational speed of engine and AMT engine target rotational speed control AMT, can realize the same engine speed, AMT moves at higher fender position, thereby it is higher to realize keeping off the position of AMT operation under the whole car same power demand, and required engine speed under the demand under the same power has been reduced, with the load factor that improves, make engine coolant temperature promote fast, thereby it is long when shortening to unfreeze when utilizing engine coolant to carry out the convection heat transfer to urea liquid and unfreeze under the mode of shifting unfreezes.
And correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is less than the theoretical rotating speed of the corresponding AMT gear-shifting engine, wherein the target rotating speed of the AMT gear-shifting engine = AMT gear-shifting engine theoretical rotating speed-first preset correction value, and the first preset correction value is greater than zero.
By limiting the first preset correction value to be larger than zero, the target rotating speed of the AMT gear-shifting engine calculated when the actual temperature of the engine cooling liquid is lower than the preset temperature limit value can be larger than the theoretical rotating speed of the AMT gear-shifting engine.
The first preset correction value is obtained according to the following steps: and inquiring the gear shifting correction rotating speed corresponding to the actual temperature of the engine cooling liquid based on the corresponding relation between the temperature of the engine cooling liquid and the gear shifting correction rotating speed, and taking the inquired gear shifting correction rotating speed as a first preset correction value.
The corresponding relation between the temperature of the engine cooling liquid and the gear shifting correction rotating speed is a known AMP diagram or data table determined through repeated experiments, and is pre-stored in an electronic control unit of the AMT. For example, the correspondence between the engine coolant temperature and the shift correction speed is detailed in the following table.
S104, correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine; s105 is then executed.
If the actual temperature of the engine coolant is not lower than the preset temperature limit value, at the moment, the unfreezing effect when the urea liquid is subjected to convective heat transfer unfreezing through the engine coolant is good, the theoretical rotating speed of each pre-stored AMT gear-shifting engine is corrected to obtain the AMT gear-shifting engine target rotating speed which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine, the AMT is controlled to shift gears based on the actual rotating speed of the engine and the AMT gear-shifting engine target rotating speed, the same engine rotating speed can be achieved, the AMT runs at a lower gear, the gear of the AMT runs at the same power requirement of the whole vehicle is lower, the engine rotating speed required under the same power requirement is increased, the rotating speed of a water pump driven by the engine is increased, the flow of the coolant flowing through the urea box is increased, and the unfreezing duration required when the engine coolant is used for convective heat transfer unfreezing of the urea liquid in the unfreezing gear-shifting mode is shortened.
The method comprises the following steps of correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine, and comprises the following steps: the AMT gear-shifting engine target rotating speed = AMT gear-shifting engine theoretical rotating speed + a second preset correction value, and the second preset correction value is larger than zero.
By limiting the second preset correction value to be larger than zero, the target rotation speed of the AMT-shift engine calculated when the actual temperature of the engine coolant is not lower than the preset temperature limit value can be made larger than the theoretical rotation speed of the AMT-shift engine.
The second preset correction value is obtained according to the following steps: and inquiring the gear shifting correction rotating speed corresponding to the actual temperature of the urea box based on the corresponding relation between the temperature of the urea box and the gear shifting correction rotating speed, and taking the inquired gear shifting correction rotating speed as a second preset correction value.
The corresponding relation between the temperature of the urea box and the gear shifting correction rotating speed is a known AMP diagram or a data table determined through repeated experiments, and is pre-stored in an electronic control unit of the AMT. For example, the correspondence between the temperature of the urea tank and the shift correction speed is detailed in the following table.
The correspondence relationship between the temperature of the urea tank and the shift correction rotation speed may be a correspondence relationship between the temperature of the urea solution in the urea tank and the shift correction rotation speed.
And S105, acquiring the actual rotating speed of the engine, and controlling the AMT to shift gears based on the actual rotating speed of the engine and the target rotating speed of the AMT shifting engine.
It is worth noting that the preset temperature limit is a known value determined by a number of repeated tests, pre-stored in the electronic control unit of the AMT. The preset temperature limit value depends on the influence of the temperature of the engine coolant and the flow of the engine coolant on the unfreezing effect when the urea liquid is subjected to convective heat transfer unfreezing by the engine coolant, when the temperature of the engine coolant is low, the effect of increasing the flow of the engine coolant by increasing the rotation speed of the engine is poor, and at the moment, the temperature of the engine coolant is mainly increased; when the engine coolant temperature is higher, the engine coolant temperature is continuously increased, the cooling effect of the engine coolant is reduced, and the engine coolant flow is increased mainly at the moment. Illustratively, the preset temperature limit is 70 ℃.
S106, acquiring the actual rotating speed of the engine, and controlling the AMT to shift gears based on the actual rotating speed of the engine and the target rotating speed of the AMT gear-shifting engine; and then returns to S102.
Further, when a thawing completion instruction for completing the thawing of the urea solution is received, the gear shifting mode is switched to the conventional gear shifting mode.
As shown in fig. 2, the present embodiment further provides an AMT gear shifting control system, which is configured to execute the AMT gear shifting control method described above.
Specifically, the AMT gear-shifting control system comprises a thawing control module 100, a gear-shifting parameter pre-storing module 200, a coolant temperature obtaining module 300, a judging module 400, a rotating speed determining module 500, an engine rotating speed obtaining module 600 and a gear-shifting control module 700, wherein the thawing control module 100 is used for controlling the engine coolant to thaw urea solution by convective heat transfer when receiving a thawing instruction for thawing the urea solution; the gear shifting parameter pre-storing module 200 is used for pre-storing theoretical rotating speeds of a plurality of AMT gear shifting engines; the coolant temperature acquisition module 300 is used for acquiring the actual temperature of the engine coolant; the judging module 400 is configured to judge whether an actual temperature of the engine coolant is lower than a preset temperature limit value in a process that the thawing control module 100 uses the engine coolant to perform convective heat transfer thawing on the urea solution; the rotating speed determining module 500 is configured to correct a pre-stored theoretical rotating speed of each AMT shift engine when an actual temperature of an engine coolant is lower than a preset temperature limit value, so as to obtain a target rotating speed of the AMT shift engine, which is lower than the theoretical rotating speed of the corresponding AMT shift engine; the rotation speed determining module 500 is further configured to correct the pre-stored theoretical rotation speed of each AMT shift engine when the actual temperature of the engine coolant is not lower than the preset temperature limit value, so as to obtain a target rotation speed of the AMT shift engine, which is greater than the theoretical rotation speed of the corresponding AMT shift engine; the engine speed obtaining module 600 is used for obtaining the actual speed of the engine; the shift control module 700 is used to control the AMT to shift based on the actual speed of the engine and the AMT shift engine target speed.
Optionally, the rotation speed determination module 500 comprises a first correction calculation unit 501 and a second correction calculation unit 502, wherein the first correction calculation unit 501 is configured to calculate each AMT-shifted engine target rotation speed when the actual temperature of the engine coolant is lower than a preset temperature limit value, the AMT-shifted engine target rotation speed = AMT-shifted engine theoretical rotation speed — a first preset correction value, and the first preset correction value is greater than zero.
The second correction calculation unit 502 is configured to calculate a target rotation speed of each AMT shift engine when the actual temperature of the engine coolant is not lower than a preset temperature limit value, where the target rotation speed of the AMT shift engine = AMT shift engine theoretical rotation speed + a second preset correction value, and the second preset correction value is greater than zero.
Optionally, the rotation speed determining module 500 further comprises a first correction pre-storing unit 503 and a first correction value determining unit 504, wherein the first correction pre-storing unit 503 is used for pre-storing a corresponding relationship between the temperature of the engine coolant and the AMT shift engine rotation speed correction value; the first correction value determining unit 504 is configured to query a shift correction rotation speed corresponding to an actual temperature of the engine coolant based on a correspondence relationship between the temperature of the engine coolant and the shift correction rotation speed, and to take the queried shift correction rotation speed as a first preset correction value.
Optionally, the rotation speed determining module 500 further includes a urea tank temperature obtaining unit 505, a second correction pre-storing unit 506, and a second correction value determining unit 507, where the urea tank temperature obtaining unit 505 is configured to obtain an actual temperature of the urea tank; the second correction pre-storing unit 506 is used for pre-storing the corresponding relation between the temperature of the urea box and the gear shifting correction rotating speed; the second correction value determination unit 507 is configured to query a shift correction rotation speed corresponding to the actual temperature of the urea tank based on a correspondence relationship between the temperature of the urea tank and the shift correction rotation speed, and use the queried shift correction rotation speed as a second preset correction value.
The embodiment also provides a vehicle comprising the AMT gear-shifting control system, which has the same beneficial effects as the AMT gear-shifting control system, and the description is not repeated here.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
- The AMT gear-shifting control method is characterized in that when a unfreezing instruction for unfreezing the urea liquid is received, the urea liquid is unfrozen by using engine cooling liquid in a convective heat transfer mode, and the following steps are executed:when the actual temperature of the engine cooling liquid is lower than a preset temperature limit value, correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is lower than the theoretical rotating speed of the corresponding AMT gear-shifting engine;when the actual temperature of the engine coolant is not lower than a preset temperature limit value, correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine to obtain the target rotating speed of the AMT gear-shifting engine, which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine;and acquiring the actual rotating speed of the engine, and controlling the AMT to shift gears based on the actual rotating speed of the engine and the target rotating speed of the AMT shifting engine.
- 2. The AMT shift control method according to claim 1, wherein the step of correcting the pre-stored theoretical rotation speed of each AMT shift engine to obtain the target rotation speed of the AMT shift engine smaller than the corresponding theoretical rotation speed of the AMT shift engine comprises:the AMT gear-shifting engine target rotating speed = AMT gear-shifting engine theoretical rotating speed-first preset correction value, and the first preset correction value is larger than zero.
- 3. The AMT shift control method according to claim 2, wherein the first preset correction value is obtained according to the steps of:and inquiring the gear-shifting correction rotating speed corresponding to the actual temperature of the engine coolant on the basis of the corresponding relation between the temperature of the engine coolant and the gear-shifting correction rotating speed, and taking the inquired gear-shifting correction rotating speed as the first preset correction value.
- 4. The AMT shift control method according to claim 1, wherein the step of correcting the theoretical rotation speed of each pre-stored AMT shift engine to obtain the target rotation speed of the AMT shift engine greater than the theoretical rotation speed of the corresponding AMT shift engine comprises:the AMT gear-shifting engine target rotating speed = AMT gear-shifting engine theoretical rotating speed + a second preset correction value, and the second preset correction value is larger than zero.
- 5. The AMT shift control method according to claim 4, wherein the second preset corrective value is obtained according to the steps of:and inquiring the gear shifting correction rotating speed corresponding to the actual temperature of the urea box based on the corresponding relation between the temperature of the urea box and the gear shifting correction rotating speed, and taking the inquired gear shifting correction rotating speed as the second preset correction value.
- An AMT shift control system for implementing the AMT shift control method of any one of claims 1 to 5, comprising:the unfreezing control module (100) is used for controlling the engine coolant to unfreeze the urea liquid through convective heat transfer when an unfreezing instruction for unfreezing the urea liquid is received;the gear shifting parameter pre-storing module (200) is used for pre-storing theoretical rotating speeds of a plurality of AMT gear shifting engines;a coolant temperature acquisition module (300) for acquiring an actual temperature of engine coolant;the judging module (400) is used for judging whether the actual temperature of the engine cooling liquid is lower than a preset temperature limit value or not when a unfreezing instruction for unfreezing the urea liquid is received;the rotating speed determining module (500) is used for correcting the prestored theoretical rotating speed of each AMT gear-shifting engine when the actual temperature of the engine cooling liquid is lower than the preset temperature limit value, so that the target rotating speed of the AMT gear-shifting engine, which is smaller than the theoretical rotating speed of the corresponding AMT gear-shifting engine, is obtained; the method is also used for correcting the theoretical rotating speed of each pre-stored AMT gear-shifting engine when the actual temperature of the engine cooling liquid is not lower than a preset temperature limit value to obtain the target rotating speed of the AMT gear-shifting engine, which is greater than the theoretical rotating speed of the corresponding AMT gear-shifting engine;an engine speed acquisition module (600) for acquiring an actual speed of the engine;and the gear shifting control module (700) controls the AMT to shift gears based on the actual rotating speed of the engine and the AMT gear shifting engine target rotating speed.
- 7. The AMT shift control system according to claim 6, characterized in that the rotational speed determination module (500) comprises:a first correction calculation unit (501) for calculating a target rotation speed of each AMT shift engine when an actual temperature of an engine coolant is lower than the preset temperature limit value, the target rotation speed of the AMT shift engine = an AMT shift engine theoretical rotation speed-a first preset correction value, and the first preset correction value is greater than zero;and the second correction calculation unit (502) is used for calculating the target rotating speed of each AMT gear-shifting engine when the actual temperature of the engine cooling liquid is not lower than the preset temperature limit value, wherein the target rotating speed of the AMT gear-shifting engine = AMT gear-shifting engine theoretical rotating speed + a second preset correction value, and the second preset correction value is larger than zero.
- 8. The AMT shift control system according to claim 7, wherein the rotation speed determination module (500) further comprises:the first correction pre-storing unit (503) is used for pre-storing the corresponding relation between the temperature of the engine cooling liquid and the AMT gear-shifting engine rotating speed correction value;a first correction value determination unit (504) for inquiring a shift correction rotation speed corresponding to an actual temperature of the engine coolant based on a correspondence relationship between the temperature of the engine coolant and the shift correction rotation speed, and taking the inquired shift correction rotation speed as a first preset correction value.
- 9. The AMT shift control system according to claim 7, wherein the rotation speed determination module (500) further comprises:a urea tank temperature acquisition unit (505) for acquiring an actual temperature of the urea tank;the second correction pre-storing unit (506) is used for pre-storing the corresponding relation between the temperature of the urea box and the gear shifting correction rotating speed;and a second correction value determination unit (507) for inquiring the shift correction rotation speed corresponding to the actual temperature of the urea tank based on the correspondence relationship between the temperature of the urea tank and the shift correction rotation speed, and using the inquired shift correction rotation speed as a second preset correction value.
- 10. A vehicle characterized by comprising an AMT shift control system according to any one of claims 6 to 9.
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