CN115949738B - AMT gear shifting control method, control system and vehicle - Google Patents
AMT gear shifting control method, control system and vehicle Download PDFInfo
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- CN115949738B CN115949738B CN202310224786.4A CN202310224786A CN115949738B CN 115949738 B CN115949738 B CN 115949738B CN 202310224786 A CN202310224786 A CN 202310224786A CN 115949738 B CN115949738 B CN 115949738B
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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 theoretical rotation speed of each pre-stored AMT gear shifting engine is corrected based on the magnitude relation between the actual temperature of engine cooling liquid and a preset temperature limit value to obtain a corresponding AMT gear shifting engine target rotation speed, the AMT is controlled to shift based on the actual rotation speed of the engine and the AMT gear shifting engine target rotation speed, the adjustment of the temperature and the flow of the engine cooling liquid is realized, and compared with the gear shifting based on the actual rotation speed of the engine and the pre-stored AMT gear shifting engine theoretical rotation speed control AMT, the thawing 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, a control system and a vehicle.
Background
The urea injection system is a standard configuration of an engine comprising a urea tank for storing a urea solution, a urea pump for delivering the urea solution in the urea tank to the urea nozzle for injecting the urea solution into the aftertreatment system, and a urea nozzle.
When the temperature is lower, the urea solution in the urea box can be frozen, and the current thawing mode adopts engine cooling liquid to carry out heat convection thawing on the frozen urea solution. However, experiments prove that the problem of longer thawing time exists in the method, and particularly, the thawing time is longer in the hot vehicle process after the engine is cold started.
Disclosure of Invention
The invention aims to provide an AMT gear shifting control method, a control system and a vehicle, which can further shorten the thawing time of urea solution.
To achieve the purpose, the invention adopts the following technical scheme:
when a defrosting instruction for defrosting urea solution is received, adopting engine cooling liquid to defrost the urea solution by convection heat exchange, and executing the following steps:
when the actual temperature of the engine coolant is lower than a preset temperature limit value, correcting the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine, which is smaller than the theoretical rotation 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 prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is higher than the theoretical rotation 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.
As a preferable technical scheme of the AMT gear shifting control method, the method corrects the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is smaller than the theoretical rotation speed of the corresponding AMT gear shifting engine, and comprises the following steps:
AMT shift engine target speed = AMT shift engine theoretical speed-first preset correction value, the first preset correction value being greater than zero.
As a preferable technical solution of the AMT 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 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 the first preset correction value.
As a preferable technical scheme of the AMT gear shifting control method, the method corrects the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is larger than the theoretical rotation speed of the corresponding AMT gear shifting engine, and comprises the following steps:
the target rotation speed of the AMT shift engine=the theoretical rotation speed of the AMT shift engine+a second preset correction value, wherein the second preset correction value is greater than zero.
As a preferable technical solution of the AMT 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 shift control system for implementing the AMT shift control method according to any one of the above aspects, the AMT shift control system comprising:
the defrosting control module is used for controlling the engine cooling liquid to defrost the urea liquid by convection heat exchange when receiving a defrosting instruction for defrosting the urea liquid;
the gear shifting parameter pre-storing module is used for pre-storing a plurality of theoretical rotating speeds of the 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 thawing control module adopts the engine cooling liquid to conduct convection heat exchange thawing 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 to obtain 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; the method is also used for correcting the prestored theoretical rotation 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 to obtain the target rotation speed of the AMT gear shifting engine which is larger than the theoretical rotation 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 rotation speed of the engine and the target rotation speed of the AMT gear shifting engine.
As a preferable technical solution of the AMT shift control system, the rotation speed determining module includes:
a first correction calculation unit, configured to calculate 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, where the AMT shift engine target rotation speed=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 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=the theoretical rotating speed of the AMT gear shifting engine+a second preset correction value, and the second preset correction value is larger than zero.
As a preferable technical solution of the AMT shift control system, the rotation speed determining module further includes:
the first correction pre-storing unit is used for pre-storing the corresponding relation between the temperature of the engine cooling liquid and the rotational speed correction value of the AMT gear shifting engine;
and a first correction value determination unit configured to query a shift correction rotational speed corresponding to an actual temperature of the engine coolant based on a correspondence between the temperature of the engine coolant and the shift correction rotational speed, and take the queried shift correction rotational speed as a first preset correction value.
As a preferable technical solution of the AMT 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 purpose, the invention also provides a vehicle, which comprises the AMT gear shift control system according to any one of the schemes.
The invention has the beneficial effects that: according to the AMT gear shifting control method, the control system and the vehicle, if the actual temperature of the engine cooling liquid is lower than the preset temperature limit value, at the moment, the urea thawing effect is poor when urea liquid is thawed by convection heat exchange through the engine cooling liquid. The AMT gear shifting engine target rotating speed smaller than the corresponding AMT gear shifting engine theoretical rotating speed is obtained by correcting the prestored AMT gear shifting engine theoretical rotating speed, the AMT is controlled to shift 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 operates in a higher gear, the gear of the AMT operation under the same power requirement of the whole automobile is achieved, the required engine rotating speed under the same power requirement is reduced, the load rate is improved, the temperature of engine cooling liquid is rapidly increased, and therefore the defrosting time required when the urea liquid is subjected to convection heat exchange defrosting by the engine cooling liquid in a defrosting mode is shortened.
If the actual temperature of the engine coolant is not lower than the preset temperature limit value, at this time, the thawing effect when the urea solution is thawed by convection heat exchange through the engine coolant is better, the preset theoretical rotation speed of each AMT gear shifting engine is corrected to obtain the target rotation speed of the AMT gear shifting engine which is larger than the theoretical rotation speed of the corresponding AMT gear shifting engine, the AMT is controlled to shift based on the actual rotation speed of the engine and the target rotation speed of the AMT gear shifting engine, the same engine rotation speed can be realized, the AMT is operated in a lower gear, the gear operated by the AMT under the same power requirement of the whole vehicle is realized, the engine rotation speed required under the same power requirement is improved, the rotation speed of a water pump driven by the engine is improved, the flow rate of the coolant flowing through the urea box is increased, and the thawing time when the urea solution is thawed by convection heat exchange through the engine coolant under the thawing gear shifting mode is shortened.
According to the invention, based on the magnitude relation between the actual temperature of the engine coolant and the preset temperature limit value, the preset theoretical rotation speed of each AMT gear shifting engine is corrected to obtain the corresponding AMT gear shifting engine target rotation speed, the AMT is controlled to shift gears based on the actual rotation speed of the engine and the AMT gear shifting engine target rotation speed, the adjustment of the temperature and the flow of the engine coolant is realized, and compared with the gear shifting operation performed by controlling the AMT based on the actual rotation speed of the engine and the preset AMT gear shifting engine theoretical rotation speed, the thawing time can be shortened by 15%.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
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 provided by an embodiment of the invention.
In the figure:
100. a thawing control module; 200. a gear shifting parameter pre-storing module; 300. a cooling liquid temperature acquisition module; 400. a judging module;
500. a rotation speed determining 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 shift control module.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The embodiment provides an AMT shift control method to solve the above technical problems. The AMT shift control method may be performed by an AMT shift control system, which may be implemented in software and/or hardware and integrated in a vehicle.
Wherein, the English of AMT is Automated Mechanical Transmission, and the Chinese is electric control mechanical automatic gearbox. The AMT includes a gear shift input shaft for connecting an output shaft of the engine, a gear shift input gear, a gear corresponding to the gear shift input gear, and a gear shift driving mechanism for driving the gear shift input gear to be connected with or separated from the corresponding gear shift gear, where the gear shift driving mechanism may be a hydraulic driving mechanism or a mechanical mechanism, and the specific structure of the AMT is a prior art in the art and will not be 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 defrosting gear shifting mode, and the conventional gear shifting mode is executed when a defrosting instruction for defrosting urea solution is not received; and executing a defrosting shift mode when a defrosting instruction for defrosting the urea solution is received.
Under the conventional gear shifting mode, the target rotating speed of the AMT gear shifting engine is in one-to-one correspondence with and equal to the theoretical rotating speed of the AMT gear shifting engine, 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.
Controlling the AMT to shift based on the actual rotational speed of the engine and the AMT shift engine theoretical rotational speed is prior art in the art, and a shift strategy for controlling the AMT to shift based on the actual rotational speed of the engine and the AMT shift engine theoretical rotational speed is briefly described below.
The AMT is provided with at least two gears, the theoretical rotation speed of the AMT gear shifting engine comprises the theoretical rotation speed of the AMT gear shifting engine and the theoretical rotation speed of the AMT gear shifting engine, and the theoretical rotation speed of the AMT gear shifting engine required by the gear shifting from a smaller gear to a larger gear is larger than the theoretical rotation speed of the AMT gear shifting engine required by the gear shifting from the larger gear to the smaller gear in the two adjacent gears.
Taking the AMT with five gears as an example, for convenience of description, the five gears of the AMT are respectively denoted as first gear, second gear, third gear, fourth gear and fifth gear in order of the gears from small to large.
And in the process of increasing the actual rotation speed of the engine, when the actual rotation speed of the engine is smaller than the theoretical rotation speed of the AMT upshift engine required by the first gear to the second gear, controlling the AMT to be in the first gear.
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 downshift engine required for the downshift from the second gear to the first gear during the process of reducing the actual rotating speed of the engine.
And in the process of increasing the actual rotation speed of the engine, controlling the AMT to be in the middle gear when the actual rotation speed of the engine is positioned between the AMT upshift engine theoretical rotation speed required by the upshift from the minimum gear to the middle gear in the adjacent three gears and the AMT upshift engine theoretical rotation speed corresponding to the upshift from the middle gear to the maximum gear.
During the process of reducing the actual rotation speed of the engine, the AMT is controlled to be in the middle gear when the actual rotation speed of the engine is positioned between the theoretical rotation speed of the AMT downshift engine required by the middle gear to be reduced to the minimum gear and the theoretical rotation speed of the AMT downshift engine required by the maximum gear to be reduced to the middle gear in the adjacent three gears.
And in the process of increasing the actual rotation speed of the engine, when the actual rotation speed of the engine is larger than the theoretical rotation speed of the AMT upshift engine required by the fourth gear to the fifth gear, controlling the AMT to be in the fifth gear.
And 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 for the fifth gear to be in the fourth gear in the process of reducing the actual rotating speed of the engine.
In the defrosting mode, the urea solution is subjected to heat convection defrosting by adopting engine cooling liquid, and the following steps are executed:
when the actual temperature of the engine coolant is lower than a preset temperature limit value, correcting the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine, which is smaller than the theoretical rotation 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 prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is higher than the theoretical rotation 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.
According to the AMT gear shifting control method, based on the magnitude relation between the actual temperature of the engine cooling liquid and the preset temperature limit value, the preset theoretical rotation speed of each AMT gear shifting engine is corrected to obtain the corresponding target rotation speed of the AMT gear shifting engine, the AMT is controlled to shift based on the actual rotation speed of the engine and the target rotation speed of the AMT gear shifting engine, the adjustment of the temperature and the flow of the engine cooling liquid is achieved, and compared with the case that the AMT is controlled to shift based on the actual rotation speed of the engine and the preset theoretical rotation speed of the AMT gear shifting engine, the thawing time can be shortened by 15%.
Fig. 1 is a flowchart of an AMT shift control method in a defrosting mode according to the present embodiment, and the AMT shift control method in the defrosting mode is described below with reference to fig. 1.
S101, when a defrosting instruction for defrosting urea solution is received, adopting engine cooling liquid to perform convection heat exchange defrosting on the urea solution.
S102, judging whether the actual temperature of the engine coolant is lower than a preset temperature limit value, if so, executing S103, and if not, executing S104.
S103, correcting the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is smaller than the theoretical rotation speed of the corresponding AMT gear shifting engine; and then S106 is performed.
If the actual temperature of the engine coolant is lower than the preset temperature limit value, the urea thawing effect is poor when the urea solution is thawed by convection heat exchange through the engine coolant. The AMT gear shifting engine target rotating speed which is larger than the corresponding AMT gear shifting engine theoretical rotating speed is obtained by correcting the prestored AMT gear shifting engine theoretical rotating speed, the AMT is controlled to shift 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 operates in a higher gear, the gear of the AMT operation under the same power requirement of the whole automobile is higher, the engine rotating speed required under the same power requirement is reduced, the load rate is improved, the temperature of engine cooling liquid is rapidly increased, and therefore the defrosting time required when the urea liquid is subjected to convection heat exchange defrosting by using the engine cooling liquid in a defrosting mode is shortened.
And correcting the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is smaller than the theoretical rotation speed of the corresponding AMT gear shifting engine, wherein the target rotation speed of the AMT gear shifting engine=the theoretical rotation speed of the AMT gear shifting engine-a first preset correction value, and the first preset correction value is larger than zero.
By limiting the first preset correction value to be larger than zero, the calculated target rotation speed of the AMT gear shifting engine when the actual temperature of the engine coolant is lower than the preset temperature limit value can be larger than the theoretical rotation 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 coolant and the gear shifting correction rotating speed is a known MAP diagram or a data table determined through repeated experiments and is pre-stored in an electronic control unit of the AMT.
S104, correcting the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is larger than the theoretical rotation speed of the corresponding AMT gear shifting engine; and then S105 is performed.
If the actual temperature of the engine coolant is not lower than the preset temperature limit value, at this time, the thawing effect when the urea solution is thawed by convection heat exchange through the engine coolant is better, the preset theoretical rotation speed of each AMT gear shifting engine is corrected to obtain the target rotation speed of the AMT gear shifting engine which is larger than the theoretical rotation speed of the corresponding AMT gear shifting engine, the AMT is controlled to shift based on the actual rotation speed of the engine and the target rotation speed of the AMT gear shifting engine, the same engine rotation speed can be realized, the AMT is operated in a lower gear, the gear operated by the AMT under the same power requirement of the whole vehicle is realized, the engine rotation speed required under the same power requirement is improved, the rotation speed of a water pump driven by the engine is improved, the flow rate of the coolant flowing through the urea box is increased, and the thawing time when the urea solution is thawed by convection heat exchange through the engine coolant under the thawing gear shifting mode is shortened.
Correcting the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is larger than the theoretical rotation speed of the corresponding AMT gear shifting engine, wherein the method comprises the following steps: AMT shift engine target speed = AMT shift engine theoretical speed + second preset correction value, the second preset correction value is greater than zero.
By limiting the second preset correction value to be larger than zero, the calculated target rotation speed of the AMT gear shifting engine when the actual temperature of the engine coolant is not lower than the preset temperature limit value can be larger than the theoretical rotation speed of the AMT gear shifting 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 MAP chart or a data table determined through repeated experiments and is pre-stored in an electronic control unit of the AMT.
The correspondence between the temperature of the urea tank and the shift correction rotational speed may be a correspondence between the temperature of the urea solution in the urea tank and the shift correction rotational speed.
S105, acquiring the actual rotation speed of the engine, and controlling the AMT to shift gears based on the actual rotation speed of the engine and the target rotation speed of the AMT shift engine.
It should be noted that the preset temperature limit value is a known value determined through repeated experiments, and is pre-stored in the electronic control unit of the AMT. The magnitude of 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 defrosting effect when the urea solution is subjected to convection heat exchange defrosting by adopting the engine coolant, and the effect of increasing the flow of the engine coolant by increasing the rotating speed of the engine is poor when the temperature of the engine coolant is lower, and the temperature of the engine coolant is mainly increased at the moment; when the temperature of the engine coolant is higher, the cooling effect of the engine coolant is reduced by continuously increasing the temperature of the engine coolant, and the flow rate of the engine coolant is increased. The preset temperature limit is, for example, 70 ℃.
S106, acquiring the actual rotation speed of the engine, and controlling the AMT to shift gears based on the actual rotation speed of the engine and the target rotation speed of the AMT shift engine; and then returns to S102.
Further, when a thawing completion instruction for completing thawing of the urea solution is received, the shift mode is switched to the normal shift mode.
As shown in fig. 2, the present embodiment further provides an AMT shift control system, which is configured to execute the AMT shift control method described above.
Specifically, the AMT shift control system comprises a thawing control module 100, a shift parameter pre-storing module 200, a coolant temperature obtaining module 300, a judging module 400, a rotation speed determining module 500, an engine rotation speed obtaining module 600 and a shift control module 700, wherein the thawing control module 100 is used for controlling the engine coolant to defrost the urea solution by convection heat exchange when receiving a thawing instruction for thawing the urea solution; the gear shift parameter pre-storing module 200 is used for pre-storing a plurality of theoretical rotational speeds of the AMT gear shift engine; the coolant temperature acquisition module 300 is configured to acquire an actual temperature of engine coolant; the judging module 400 is configured to judge whether the actual temperature of the engine coolant is lower than a preset temperature limit value in a process of performing convective heat transfer thawing on the urea solution by the thawing control module 100 using the engine coolant; the rotation speed determining module 500 is configured to correct a prestored theoretical rotation speed of each AMT shift engine to obtain a target rotation speed of the AMT shift engine that is less than the theoretical rotation speed of the corresponding AMT shift engine when the actual temperature of the engine coolant is lower than a preset temperature limit; the rotation speed determining module 500 is further configured to correct a preset theoretical rotation speed of each AMT shift engine to obtain a target rotation speed of the AMT shift engine that is greater than the corresponding theoretical rotation speed of the AMT shift engine when the actual temperature of the engine coolant is not lower than a preset temperature limit; the engine speed acquisition module 600 is configured to acquire an actual speed of the engine; the shift control module 700 is configured to control the AMT to shift gears based on an actual rotational speed of the engine and an AMT shift engine target rotational speed.
Optionally, the rotation speed determining module 500 includes a first correction calculating unit 501 and a second correction calculating unit 502, where the first correction calculating unit 501 is configured to calculate, when the actual temperature of the engine coolant is lower than a preset temperature limit value, a target rotation speed of each AMT shift engine, where the AMT shift engine target rotation speed=amt shift 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, when the actual temperature of the engine coolant is not lower than the preset temperature limit value, a target rotation speed of each AMT shift engine, where the target rotation speed of the AMT shift engine=the theoretical rotation speed of the AMT shift engine+a second preset correction value, where the second preset correction value is greater than zero.
Optionally, the rotation speed determining module 500 further includes a first correction pre-storing unit 503 and a first correction value determining unit 504, where the first correction pre-storing unit 503 is configured to pre-store a correspondence between a temperature of an engine coolant and an AMT shift engine rotation speed correction value; the first correction value determining unit 504 is configured to query a shift correction rotational 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 rotational speed, and take the queried shift correction rotational speed as a first preset correction value.
Optionally, the rotation speed determining module 500 further includes a urea tank temperature acquiring unit 505, a second correction pre-storing unit 506, and a second correction value determining unit 507, where the urea tank temperature acquiring unit 505 is configured to acquire 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 determining unit 507 is configured to query a shift correction rotation speed corresponding to an actual temperature of the urea tank based on a correspondence between the temperature of the urea tank and the shift correction rotation speed, and take the queried shift correction rotation speed as a second preset correction value.
The embodiment also provides a vehicle including the AMT shift control system, which has the same advantages as the AMT shift control system, and the description thereof will not be repeated.
Furthermore, the foregoing description of the preferred embodiments and the principles of the invention is provided herein. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
- The AMT gear shift control method is characterized in that when a defrosting instruction for defrosting urea solution is received, engine cooling liquid is adopted to defrost the urea solution by convection heat exchange, and the following steps are executed:when the actual temperature of the engine coolant is lower than a preset temperature limit value, correcting the prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine, which is smaller than the theoretical rotation 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 prestored theoretical rotation speed of each AMT gear shifting engine to obtain the target rotation speed of the AMT gear shifting engine which is higher than the theoretical rotation 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 correcting a prestored theoretical rotational speed of each AMT shift engine to obtain a target rotational speed of the AMT shift engine smaller than the theoretical rotational speed of the corresponding AMT shift engine comprises:AMT shift engine target speed = AMT shift engine theoretical speed-first preset correction value, the first preset correction value being greater than zero.
- 3. The AMT shift control method according to claim 2, characterized in that said first preset correction value is obtained by: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 the first preset correction value.
- 4. The AMT shift control method of claim 1, wherein correcting a prestored theoretical rotational speed of each AMT shift engine to obtain a target rotational speed of the AMT shift engine greater than the theoretical rotational speed of the corresponding AMT shift engine comprises:the target rotation speed of the AMT shift engine=the theoretical rotation speed of the AMT shift engine+a second preset correction value, wherein the second preset correction value is greater than zero.
- 5. The AMT shift control method according to claim 4, wherein said second preset correction value is obtained by: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.
- AMT shift control system for implementing an AMT shift control method according to any one of claims 1 to 5, comprising:the defrosting control module (100) is used for controlling the engine cooling liquid to defrost the urea liquid by convection heat exchange when receiving a defrosting instruction for defrosting the urea liquid;the gear shifting parameter pre-storing module (200) is used for pre-storing a plurality of theoretical rotational speeds of the AMT gear shifting engine;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 defrosting instruction for defrosting 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 to obtain 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; the method is also used for correcting the prestored theoretical rotation 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 to obtain the target rotation speed of the AMT gear shifting engine which is larger than the theoretical rotation speed of the corresponding AMT gear shifting engine;an engine speed acquisition module (600) for acquiring an actual speed of the engine;a shift control module (700) controls the AMT to shift gears based on the actual speed of the engine and the AMT shift engine target speed.
- 7. The AMT shift control system according to claim 6, wherein said rotational speed determination module (500) comprises:a first correction calculation unit (501) configured to calculate 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, where AMT shift engine target rotation speed=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=the theoretical rotating speed of the AMT gear shifting engine+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 said rotational speed determination module (500) further comprises:a first correction pre-storing unit (503) for pre-storing a correspondence between a temperature of an engine coolant and a rotational speed correction value of the AMT shift engine;and a first correction value determination unit (504) for inquiring the shift correction rotational speed corresponding to the actual temperature of the engine coolant based on the correspondence between the temperature of the engine coolant and the shift correction rotational speed, and taking the inquired shift correction rotational speed as a first preset correction value.
- 9. The AMT shift control system according to claim 7, wherein said rotational speed determination module (500) further comprises:a urea tank temperature acquisition unit (505) for acquiring an actual temperature of the urea tank;a second correction pre-storing unit (506) for pre-storing a correspondence between the temperature of the urea tank and the shift correction rotation speed;and a second correction value determination unit (507) configured to query a shift correction rotational speed corresponding to the actual temperature of the urea tank based on a correspondence between the temperature of the urea tank and the shift correction rotational speed, and take the queried shift correction rotational speed as a second preset correction value.
- 10. A vehicle comprising an AMT shift control system according to any one of claims 6 to 9.
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