CN113357027B - Torque control method and device - Google Patents
Torque control method and device Download PDFInfo
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- CN113357027B CN113357027B CN202010153282.4A CN202010153282A CN113357027B CN 113357027 B CN113357027 B CN 113357027B CN 202010153282 A CN202010153282 A CN 202010153282A CN 113357027 B CN113357027 B CN 113357027B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating or supervising devices
- F02B77/089—Safety, indicating or supervising devices relating to engine temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The invention discloses a torque control method and a device, wherein the torque control method controls a four-wheel drive torque distribution strategy of a torque management system according to the current temperature, the current temperature gradient and the current four-wheel drive mode by acquiring real-time driving state parameters of a vehicle, wherein the driving state parameters comprise the current four-wheel drive mode, the current temperature of the torque management system and the current temperature gradient of the torque management system, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy; according to the invention, under the condition that a driving mode is not required to be changed, the aim of controlling the temperature of the torque management system is achieved by controlling the switching of the four-wheel-drive torque distribution strategy, the further temperature rise of the torque management system is delayed as much as possible before temperature protection, the temperature stability of the torque management system is favorably maintained, the reliability of the vehicle four-wheel-drive system, especially the torque management system, is effectively improved, and the dynamic performance of the vehicle on severe roads such as deep sand, deep snow, muddy, potholes and rugged road surfaces is improved.
Description
Technical Field
The invention relates to the technical field of vehicle four-wheel drive electric control, in particular to a torque control method and device.
Background
The timely four-wheel drive system of the vehicle is additionally provided with the power takeoff, the transmission shaft, the torque management system and the rear differential speed reducer assembly, and the output torque of the timely four-wheel drive system is controlled by the torque management system.
However, since the torque management system realizes torque distribution by controlling the compression and the disconnection of the clutch plates, when the vehicle runs on severe roads such as deep sand, snow, mud, pothole, bumpiness and the like, the front shaft and the rear shaft of the vehicle have large rotating speed difference, the clutch plates are in a sliding state at the moment, the temperature rises, the temperature field of the clutch plates needs to be effectively intervened, and the phenomenon that the torque management system is overheated to fail due to ultrahigh temperature, the four-wheel drive power is lost, and even the four-wheel drive system is damaged is avoided.
In the existing temperature control strategy of the torque management system, the selection and implementation of the strategy depend on the judgment and operation of a driver, if the judgment and operation of the driver are unreasonable, the torque management system is not controlled before temperature protection, or the control strategy is not switched at a proper time, so that the conditions of poor fuel economy of the whole vehicle and large noise vibration of a transmission shaft easily occur, and when the control strategy of a driver is not selected properly, the problems of large slip amount and rapid temperature rise of the torque management system easily occur, so that the torque management system is overheated and loses efficacy, further the vehicle dynamic property is easily lost, and the passing property of the vehicle on a harsh road surface is not facilitated.
Disclosure of Invention
The invention provides a temperature control method, a temperature control device and a storage medium of a torque management system, which aim to solve the problem that the system is overheated and fails due to the fact that the torque management system has high dependence on a driver and the situations of large slippage and rapid temperature rise are easily caused by improper selection of a driver control strategy.
A torque control method comprising:
acquiring real-time driving state parameters of a vehicle, wherein the driving state parameters comprise: a current four-wheel drive mode, a current temperature of the torque management system, and a current temperature gradient of the torque management system;
and controlling a four-wheel drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel drive mode, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy.
Further, the controlling a four-wheel-drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel-drive mode includes:
determining whether a four-wheel-drive torque distribution strategy in the current four-wheel-drive mode needs to be switched according to the current temperature, the current temperature gradient and the current four-wheel-drive mode;
and when the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched, switching the four-wheel drive torque distribution strategy in the current four-wheel drive mode according to the current temperature and the current temperature gradient.
Further, the determining whether a four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature, the current temperature gradient and the current four-wheel drive mode includes:
when the current four-wheel drive mode is the third mode, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched;
and when the current four-wheel drive mode is the first mode or the second mode, determining whether a four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature and the current temperature gradient.
Further, the determining whether a four-wheel-drive torque distribution strategy in the current four-wheel-drive mode needs to be switched according to the current temperature and the current temperature gradient includes:
determining a four-wheel-drive torque distribution strategy required to be used according to the current temperature and the current temperature gradient;
determining whether the temperature rise of the four-wheel-drive torque distribution strategy needing to be used is smaller than the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode;
if so, determining that the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched;
if not, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched.
Further, the four-wheel-drive torque distribution strategy comprises a first-stage strategy, a second-stage strategy and a third-stage strategy, wherein the calorific value of the four-wheel-drive torque distribution strategy is sequentially decreased, and when the current four-wheel-drive mode is the first mode, the four-wheel-drive torque distribution strategy which needs to be used is determined according to the current temperature and the current temperature gradient, and the four-wheel-drive torque distribution strategy comprises the following steps:
when the current temperature and the current temperature gradient meet preset conditions, determining that the vehicle needs to use the third-level strategy, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval;
when the current temperature and the current temperature gradient do not meet the preset conditions and the current temperature is higher than a first preset temperature, determining that the vehicle needs to use the second-level strategy;
determining that the vehicle needs to use the first-level strategy when the current temperature is less than or equal to a first preset temperature.
Further, the four-wheel drive torque distribution strategy comprises a first-stage strategy, a second-stage strategy and a third-stage strategy, wherein the calorific value of the four-wheel drive torque distribution strategy is sequentially decreased, and when the current four-wheel drive mode is the second mode, the four-wheel drive torque distribution strategy which needs to be used is determined according to the current temperature and the current temperature gradient, and the four-wheel drive torque distribution strategy comprises the following steps:
when the current temperature and the current temperature gradient meet preset conditions, determining that the vehicle needs to use the third-level strategy, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval;
and when the current temperature and the current temperature gradient do not meet the preset condition, determining that the vehicle needs to use the second-stage strategy.
Further, the switching the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode according to the current temperature and the current temperature gradient comprises:
determining whether the current temperature gradient is greater than the estimated temperature gradient after switching;
when the current temperature gradient is larger than the predicted temperature gradient after switching, switching the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode into the four-wheel-drive torque distribution strategy required to be used;
and when the current temperature gradient is smaller than or equal to the predicted temperature gradient after switching, maintaining the original four-wheel drive torque distribution strategy in the current four-wheel drive mode.
Further, after the controlling the four-wheel-drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel-drive mode, the method further comprises:
limiting an engine torque of the vehicle according to the current temperature and the current temperature gradient;
and sending overheating early warning to the vehicle according to the current temperature and the current temperature gradient, and exiting the four-wheel drive mode of the vehicle.
Further, said limiting an engine torque of said vehicle based on said current temperature and said current temperature gradient comprises:
determining whether an engine torque of the vehicle needs to be limited based on the current temperature and the current temperature gradient;
when the torque of the engine of the vehicle needs to be limited, a request corresponding to the torque is sent to the engine of the vehicle;
acquiring the requested torque of other systems to the engine;
determining whether the corresponding torque is less than all of the requested torques;
and when the corresponding torque is smaller than all the requested torques, controlling the engine to execute the corresponding torque.
A torque control device comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring real-time running state parameters of a vehicle, and the running state parameters comprise a current four-wheel drive mode, a current temperature of a torque management system and a current temperature gradient of the torque management system;
and the control module is used for controlling a four-wheel drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel drive mode, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy.
A torque control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the torque control method as described above when executing the computer program.
A readable storage medium, storing a computer program which, when executed by a processor, implements the steps of the torque control method as described above.
In one scheme realized by the torque control method and the torque control device, a four-wheel drive torque distribution strategy of the torque management system is controlled according to the current temperature, the current temperature gradient and the current four-wheel drive mode by acquiring real-time running state parameters of a vehicle, wherein the running state parameters comprise the current four-wheel drive mode, the current temperature of the torque management system and the current temperature gradient of the torque management system, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy; according to the invention, under the condition that a driving mode is not required to be changed, the four-wheel-drive torque distribution strategy of the torque management system is controlled by combining the current temperature and the temperature gradient, so that the torque management system works according to the controlled four-wheel-drive torque distribution strategy, the purpose of controlling the temperature of the torque management system is achieved, the further temperature rise of the torque management system is delayed as much as possible before the temperature protection is carried out on the torque management system, the temperature stability of the torque management system is favorably maintained, the reliability of the vehicle four-wheel-drive system, especially the torque management system, is effectively improved, the dynamic performance of the vehicle on severe roads such as deep sand, deep snow, mud, pothole and rugged road is improved, the continuous cross-country performance of the vehicle is ensured, and the product market competition is favorably realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic flow chart of a torque control method according to an embodiment of the present invention;
FIG. 2 is a logic diagram of a demand policy in a first mode according to an embodiment of the present invention;
FIG. 3 is a logic diagram illustrating a demand policy in a second mode according to an embodiment of the present invention;
FIG. 4 is another schematic flow chart of a torque control method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a torque control device according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another embodiment of a torque control device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment, as shown in FIG. 1, a torque control method is provided, comprising the steps of:
s10: and acquiring real-time running state parameters of the vehicle, wherein the running state parameters comprise a current four-wheel drive mode, the current temperature of a torque management system and the current temperature gradient of the torque management system.
In the running process of the vehicle, real-time running state parameters of the vehicle need to be acquired, wherein the running state parameters comprise a current four-wheel drive mode of the vehicle, a current temperature of a torque management system and a current temperature gradient of the torque management system.
The torque management system mainly comprises a hydraulic motor, a hydraulic system, a wet-type multi-plate clutch and a torque control device, wherein the current temperature of the torque management system is the current oil temperature of the hydraulic system and is obtained by detecting the oil temperature of the hydraulic system, and the current temperature gradient of the torque management system is the current oil temperature gradient of the hydraulic system and is obtained by detecting and analyzing the oil temperature of the hydraulic system; the current four-wheel drive mode of the vehicle is obtained by a driving mode signal of the vehicle.
S20: and controlling a four-wheel drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel drive mode, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy.
After the current four-wheel drive mode, the current temperature of the torque management system and the current temperature gradient of the torque management system are analyzed, the four-wheel drive torque distribution strategy of the torque management system is controlled according to the current four-wheel drive mode and the change conditions of the current temperature and the current temperature gradient, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy, and the temperature of the torque management system of the vehicle is controlled.
Because the torque management system realizes torque distribution by controlling the compression and the disconnection of the clutch plates, when a vehicle runs on a severe road surface such as deep sand, snow, mud, pothole, bumpiness and the like, a large rotation speed difference exists between the front shaft and the rear shaft of the vehicle, and the clutch plates are in a slipping state and rise in temperature, so that the torque management system is increased. In order to avoid overheating failure of the torque management system caused by ultrahigh temperature, the four-wheel-drive torque distribution strategy of the torque management system is controlled, so that the torque management system works according to the controlled four-wheel-drive torque distribution strategy, and the aim of controlling the temperature of the torque management system is fulfilled.
In the embodiment of the invention, by acquiring real-time driving state parameters of a vehicle, wherein the driving state parameters comprise a current four-wheel drive mode, a current temperature of a torque management system and a current temperature gradient of the torque management system, a four-wheel drive torque distribution strategy of the torque management system is controlled according to the current temperature, the current temperature gradient and the current four-wheel drive mode, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy; according to the invention, under the condition that a driving mode is not required to be changed, the four-wheel-drive torque distribution strategy of the torque management system is controlled, so that the torque management system works according to the controlled four-wheel-drive torque distribution strategy, the purpose of controlling the temperature of the torque management system is achieved, further temperature rise of the torque management system is delayed as much as possible before the torque management system is subjected to temperature protection, the temperature stability of the torque management system is favorably maintained, the reliability of the vehicle four-wheel-drive system, particularly the torque management system, is effectively improved, the dynamic performance of a vehicle on severe roads with deep sand, deep snow, mud, potholes, bumpiness and the like is improved, the continuous off-road performance of the vehicle is ensured, and the product market competition is facilitated.
Specifically, in the present embodiment, the four-wheel drive mode (mode) of the vehicle includes a first mode (mode 1), a second mode (mode 2), and a third mode (mode 3) in which the four-wheel drive intervention strength increases in order, and the four-wheel drive torque distribution strategy of the torque management system includes a first-stage strategy, a second-stage strategy, and a third-stage strategy. A first level strategy is executed when a four-wheel drive mode of the vehicle is in a first mode, a second level strategy is executed when the vehicle is in a second mode, and a third level strategy is executed when the vehicle is in a third mode.
When the torque management system executes the first-stage Strategy (Strategy 1), the second-stage Strategy (Strategy 2) and the third-stage Strategy (Strategy 3) respectively, the temperature rise in the torque management system is reduced in sequence. The main features of each strategy are shown in table 1:
TABLE 1
In an embodiment, in step S20, controlling the four-wheel drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel drive mode specifically includes the following steps:
s21: and determining whether the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched or not according to the current temperature, the current temperature gradient and the current four-wheel drive mode.
For example, a four-wheel drive torque distribution strategy in the current four-wheel drive mode is determined according to the current four-wheel drive mode, and then whether the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched is determined according to the current temperature and the change situation of the current temperature gradient.
And when the four-wheel drive torque distribution strategy in the current four-wheel drive mode is determined not to be switched according to the current temperature, the current temperature gradient and the current four-wheel drive mode, maintaining the original four-wheel drive torque distribution strategy in the current four-wheel drive mode.
Specifically, whether the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched or not is determined according to the current temperature, the current temperature gradient and the current four-wheel drive mode, and the method comprises the following steps:
s211: when the current four-wheel drive mode is the third mode, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched.
The current four-wheel drive mode of the vehicle is the third mode, the four-wheel drive torque distribution strategy executed by the torque management system is the third-level strategy, at the moment, the vehicle takes the four-wheel drive performance as a primary target, the four-wheel drive is more involved, the temperature rise of the torque management system is slow, and the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched no matter the current temperature and the current temperature gradient are any values.
S212: and when the current four-wheel drive mode is the first mode or the second mode, determining whether the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature and the current temperature gradient.
After the four-wheel drive mode of the vehicle is determined to be not the third mode according to the current four-wheel drive mode, when the current four-wheel drive mode is determined to be the first mode or the second mode, whether the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched is determined according to the current temperature and the change situation of the current temperature gradient.
For example, when the current four-wheel drive mode of the vehicle is the first mode, the four-wheel drive torque distribution strategy executed by the torque management system is the first-level strategy, and at the moment, the four-wheel drive intervention is less, the four-wheel drive strength is insufficient, the passing performance on severe roads such as deep sand, mud, potholes and bumpiness is poor, and the temperature rise of the torque management system is faster. If the current temperature and the current temperature gradient are high, in order to delay the temperature rise of a torque management system and improve the passing property of a severe road surface, a first-stage strategy needs to be switched into a second-stage strategy or a third-stage strategy; if the current temperature and the current temperature gradient are not high, the temperature rise of the torque management system does not need to be controlled, and the first-stage strategy does not need to be switched.
Specifically, when the current four-wheel drive mode is the first mode or the second mode, whether the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched is determined according to the current temperature and the current temperature gradient, and the method specifically includes the following steps:
s2121: and determining a four-wheel drive torque distribution strategy required to be used according to the current temperature and the current temperature gradient.
The current four-wheel drive mode is a first mode, the four-wheel drive torque distribution strategy executed by the torque management system is a first-level strategy, the current four-wheel drive mode is a second mode, the four-wheel drive torque distribution strategy executed by the torque management system is a second strategy, and at this time, the four-wheel drive torque distribution strategy which should be used by the vehicle at this time needs to be specifically determined according to the current temperature and the current temperature gradient.
Specifically, as shown in fig. 2, when the current four-wheel drive mode (mode) is the first mode1, the four-wheel drive torque distribution strategy that is determined to be required to be used by the vehicle at the time according to the current temperature and the current temperature gradient includes the following three cases:
a. and determining that the vehicle needs to use a third-level strategy when the current temperature and the current temperature gradient meet preset conditions, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval.
For example, the preset conditions are a plurality of temperature intervals shown in fig. 2 and temperature gradient intervals corresponding to the temperature intervals, after the current four-wheel drive mode, the current temperature T and the current temperature gradient dT are acquired, it is determined that the four-wheel drive mode of the vehicle is not the third mode3 according to the current four-wheel drive mode, and it is determined that the four-wheel drive mode of the vehicle is not the second mode2, then the four-wheel drive mode of the vehicle is the first mode1, and at this time, a four-wheel drive torque distribution strategy required to be used in the first mode is determined according to the preset conditions.
Specifically, after the current four-wheel drive mode of the vehicle is determined to be not the third mode or the second mode, the current four-wheel drive mode is determined to be the first mode, the four-wheel drive torque distribution strategy executed by the torque management system is the first-level strategy, and if the current temperature and the current temperature gradient meet preset conditions, the vehicle is determined to need to use the third-level strategy, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval.
In one embodiment, the current temperature is T, the current temperature gradient is dT, and the current temperature of the torque management system is divided into five preset temperatures with sequentially increasing temperatures: the torque management system comprises a first preset temperature T1, a second preset temperature T2, a third preset temperature T3, a fourth preset temperature T4 and a fifth preset temperature T4, wherein the current temperature gradient of the torque management system is divided into five preset gradients which are sequentially increased: the method comprises the following steps of firstly, setting a first preset gradient dT1, a second preset gradient dT2, a third preset gradient dT3, a fourth preset gradient dT4 and a fifth preset gradient dT4, wherein each preset temperature and each preset gradient are shown in the following table 2:
TABLE 2
The preset conditions include:
the current temperature is greater than a first preset temperature T1, and the current temperature gradient is greater than a first preset gradient dT5;
the current temperature is in a first temperature interval and the current temperature gradient is in a first gradient interval, the first temperature interval is (T1, T2), and the first gradient interval is (dT 4, dT 5);
the current temperature is in a second temperature interval and the current temperature gradient is in a second gradient interval, the second temperature interval is [ T2, T3 ], and the first gradient interval is [ dT3, dT 4) ];
the current temperature is in a third temperature interval and the current temperature gradient is in a third gradient interval, the third temperature interval is [ T3, T4 ], and the third gradient interval is [ dT2, dT 3);
the current temperature is in a fourth temperature interval and the current temperature gradient is in a fourth gradient interval, the fourth temperature interval is [ T4, T5 ], and the fourth gradient interval is [ dT1, dT 2);
the current temperature is greater than or equal to a fifth preset temperature T5.
For example, when the current four-wheel drive mode is the first mode, the four-wheel drive torque allocation strategy executed by the torque management system is the first-stage strategy, the current temperature is [ T2, T3), the current temperature gradient is [ dT3, dT 4), and the current temperature gradient do not meet the preset conditions, it is determined that the vehicle needs to use the third-stage strategy.
In the present invention, the symbol of the preset temperature gradient, and the preset condition are only exemplary illustrations, in other embodiments, the symbol of the preset temperature and the symbol of the preset temperature gradient may be other symbols, and the preset condition may also be other symbols, and are not described herein again.
b. And determining that the vehicle needs to use a second-stage strategy when the current temperature and the current temperature gradient do not meet the preset conditions and the current temperature is higher than the first preset temperature.
And if the current temperature and the current temperature gradient do not meet preset conditions and the current temperature is greater than the first preset temperature, determining that the vehicle needs to use a second-stage strategy, wherein the preset conditions comprise a plurality of stages of temperature intervals and temperature gradient intervals corresponding to the temperature intervals.
Namely, in order to ensure the fuel economy, when the current temperature is not high or the temperature rise gradient is not large, the second-level strategy is preferentially judged to be needed by the vehicle. For example, when the current four-wheel drive mode is the first mode, the four-wheel drive torque distribution strategy executed by the torque management system is the first-stage strategy, the current temperature is [ T2, T3), but the current temperature gradient is [ dT2, dT 43), and since T2 is greater than the first preset temperature T1, the current temperature and the current temperature gradient do not satisfy the preset condition and the current temperature is greater than the first preset temperature, it is determined that the vehicle needs to use the second-stage strategy.
c. And determining that the vehicle needs to use the first-level strategy when the current temperature is less than or equal to the first preset temperature.
For example, when the current four-wheel drive mode is the first mode, the four-wheel drive torque distribution strategy executed by the torque management system is the first-level strategy, and the current temperature is less than or equal to the first preset temperature, it is determined that the vehicle needs to use the first-level strategy.
Specifically, as shown in fig. 3, when the current four-wheel drive mode (mode) is the second mode (mode 2), the four-wheel drive torque distribution strategy which is determined to be required to be used by the vehicle at the moment according to the current temperature and the current temperature gradient comprises the following two cases:
d. and determining that the vehicle needs to use the third-level strategy when the current temperature and the current temperature gradient meet preset conditions, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval.
As shown in fig. 3, after the current four-wheel drive mode, the current temperature T and the current temperature gradient dT are obtained, it is determined that the four-wheel drive mode of the vehicle is not the third mode3 according to the current four-wheel drive mode, and then it is determined that the four-wheel drive mode of the vehicle is the second mode2, and at this time, a four-wheel drive torque distribution strategy required to be used in the second mode is determined according to the preset conditions.
Specifically, when the current four-wheel drive mode is the second mode, the four-wheel drive torque distribution strategy executed by the torque management system is the second-stage strategy, and if the current temperature and the current temperature gradient meet preset conditions, it is determined that the vehicle needs to use the third-stage strategy.
e. And determining that the vehicle needs to use a second-stage strategy when the current temperature and the current temperature gradient do not meet the preset conditions.
For example, when the current four-wheel drive mode is the second mode, the four-wheel drive torque distribution strategy executed by the torque management system is the second-stage strategy, and if the current temperature and the current temperature gradient do not meet the preset conditions, it is determined that the vehicle needs to use the second-stage strategy.
S2122: and determining whether the temperature rise of the four-wheel drive torque distribution strategy required to be used is smaller than that of the four-wheel drive torque distribution strategy in the current four-wheel drive mode.
And after determining the four-wheel-drive torque distribution strategy which needs to be used according to the current temperature and the current temperature gradient, determining whether the temperature rise of the four-wheel-drive torque distribution strategy which needs to be used is smaller than that of the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode.
S2123: and if the temperature rise of the four-wheel drive torque distribution strategy required to be used is smaller than that of the four-wheel drive torque distribution strategy in the current four-wheel drive mode, determining that the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched.
For example, when the current four-wheel drive mode is the first mode, the four-wheel drive torque distribution strategy executed by the torque management system is the first-stage strategy, and the four-wheel drive torque distribution strategy required to be used is determined to be the second-stage strategy according to the current temperature and the current temperature gradient, and at this time, if the temperature rise of the second-stage strategy is determined to be smaller than that of the first-stage strategy in the current four-wheel drive mode, it is determined that the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched.
S2124: if the temperature rise of the four-wheel drive torque distribution strategy to be used is not smaller than the four-wheel drive torque distribution strategy in the current four-wheel drive mode, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched.
For example, when the current four-wheel drive mode is the first mode, the four-wheel drive torque distribution strategy executed by the torque management system is the first-stage strategy, and the four-wheel drive torque distribution strategy required to be used is determined to be the first-stage strategy according to the current temperature and the current temperature gradient, at this time, the temperature rise of the torque management system is not changed, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched, and the torque management system maintains the original four-wheel drive torque distribution strategy in the current four-wheel drive mode, namely the first-stage strategy.
S22: and when the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched, switching the four-wheel drive torque distribution strategy in the current four-wheel drive mode according to the current temperature and the current temperature gradient.
And after determining whether the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode needs to be switched according to the current temperature, the current temperature gradient and the current four-wheel-drive mode, when determining that the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode needs to be switched, switching the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode according to the change conditions of the current temperature and the current temperature gradient.
For example, when the current four-wheel drive mode is the first mode, the four-wheel drive torque distribution strategy executed by the torque management system is the first-stage strategy, the four-wheel drive torque distribution strategy required to be used is determined to be the second-stage strategy according to the current temperature and the change situation of the current temperature gradient, the four-wheel drive torque distribution strategy in the current four-wheel drive mode is determined to be required to be switched, and the four-wheel drive torque distribution strategy of the vehicle is switched from the original first-stage strategy to the second-stage strategy.
In the embodiment, whether the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched is determined according to the current temperature, the current temperature gradient and the current four-wheel drive mode, and when the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched, the four-wheel drive torque distribution strategy in the current four-wheel drive mode is switched according to the current temperature and the current temperature gradient.
In an embodiment, when the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched, in step S22, that is, the four-wheel drive torque distribution strategy in the current four-wheel drive mode is switched according to the current temperature and the current temperature gradient, specifically including the following steps:
s221: and determining whether the current temperature gradient is larger than the estimated temperature gradient after switching.
In order to delay the temperature rise of the torque management system, when the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode needs to be switched, whether the four-wheel-drive torque distribution strategy is switched needs to be determined according to the pre-estimated temperature gradient after switching, and at the moment, whether the current temperature gradient is larger than the pre-estimated temperature gradient after switching needs to be determined.
For example, when the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched, the four-wheel drive torque distribution strategy of the vehicle needs to be switched according to the change conditions of the current temperature and the current temperature gradient, the temperature gradient of the torque management system can be estimated to rise or fall according to the switched four-wheel drive torque distribution strategy, if the estimated temperature gradient rises, the current temperature gradient is smaller than the estimated temperature gradient after switching, and if the estimated temperature gradient falls, the current temperature gradient is larger than the estimated temperature gradient after switching.
S222: and when the current temperature gradient is greater than the predicted temperature gradient after switching, switching the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode into the four-wheel-drive torque distribution strategy required to be used.
For example, when the four-wheel drive mode of the vehicle is the first mode, the four-wheel drive torque distribution strategy in the current four-wheel drive mode is the first-stage strategy, the four-wheel drive torque distribution strategy needing to be used is determined to be the second-stage strategy according to the change conditions of the current temperature and the current temperature gradient, the temperature rise of the second-stage strategy is smaller than that of the first-stage strategy, therefore, the current temperature gradient is larger than the predicted temperature gradient after switching, and the four-wheel drive torque distribution strategy of the vehicle is switched from the first-stage strategy to the second-stage strategy needing to be used.
S223: and when the current temperature gradient is less than or equal to the predicted temperature gradient after switching, maintaining the original four-wheel drive torque distribution strategy in the current four-wheel drive mode.
For example, when the four-wheel drive mode of the vehicle is the first mode, the original four-wheel drive torque distribution strategy in the current four-wheel drive mode is the first-stage strategy, and the four-wheel drive torque distribution strategy which needs to be used is determined to be the first-stage strategy according to the change conditions of the current temperature and the current temperature gradient, so that the original four-wheel drive torque distribution strategy in the current four-wheel drive mode is maintained if the current temperature gradient is equal to the predicted temperature gradient after switching, that is, the four-wheel drive torque distribution strategy of the vehicle is maintained at the first-stage strategy.
In this embodiment, when the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode needs to be switched, by determining whether the current temperature gradient is greater than the predicted temperature gradient after switching, when the previous temperature gradient is greater than the predicted temperature gradient after switching, the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode is switched to the four-wheel-drive torque distribution strategy that needs to be used, and when the current temperature gradient is less than or equal to the predicted temperature gradient after switching, the original four-wheel-drive torque distribution strategy in the current four-wheel-drive mode is maintained, so that the accuracy of the torque management system in switching the four-wheel-drive torque distribution strategy is improved.
In an embodiment, as shown in fig. 4, after controlling the four-wheel-drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel-drive mode in step S20, the method further includes the following steps:
s31: the engine torque of the vehicle is limited based on the current temperature and the current temperature gradient.
In the running process of the vehicle, after a four-wheel drive torque distribution strategy of a torque management system is controlled according to the current temperature, the current temperature gradient and the current four-wheel drive mode, the torque of an engine of the vehicle is limited according to the changes of the current temperature and the current temperature gradient, and if the temperature of the torque management system is further increased, the torque of the engine is limited so as to control the temperature rise of the torque management system.
In one embodiment, limiting the engine torque of the vehicle based on the current temperature and the current temperature gradient comprises the steps of:
s311: it is determined whether a limitation of the engine torque of the vehicle is required based on the current temperature and the current temperature gradient.
And limiting the engine torque of the vehicle according to the current temperature and the current temperature gradient acquired by the current torque management system.
Specifically, when the current temperature is higher than the sixth preset temperature and lower than the preset limit temperature, a request corresponding to torque is sent to an engine of the vehicle; or when the current temperature is greater than a sixth preset temperature and the current temperature gradient is not greater than a fourth preset gradient dT4, sending a request corresponding to torque to an engine of the vehicle, wherein the preset limit temperature is the highest limit temperature acceptable by the torque management system under the normal operation condition, and the sixth preset temperature is less than the preset limit temperature.
For example, if the preset limit temperature is Tmax, the sixth preset temperature is Tmax-40 ℃.
In this embodiment, the sixth preset temperature is Tmax-40 ℃ only for exemplary illustration, and in other embodiments, the sixth preset temperature may also be other temperatures, which are not described herein again.
S312: when the engine torque of the vehicle needs to be limited, a request corresponding to the torque is sent to the engine of the vehicle.
For example, when the torque of the engine of the vehicle needs to be limited, a torque limitation request is sent to the engine of the vehicle to request the engine to execute the torque N, corresponding to the torque N.
S313: acquiring the requested torque of other systems to the engine;
the torque request of other systems to the engine is obtained, and the torque request of other systems to the engine comprises the current torque of the engine, the torque request of the driving force control system to the engine, the torque request of the hydraulic torque converter to the engine and the like.
In this embodiment, the current torque of the engine, the torque requested by the driving force control system and the torque requested by the hydraulic torque converter to the engine are only exemplary illustrations, and in other embodiments, the torque requested by other systems to the engine includes others, which are not described herein again.
S314: it is determined whether the corresponding torque is less than all of the requested torques.
S315: and controlling the engine to execute the corresponding torque when the corresponding torque is smaller than all the requested torques.
For example, the corresponding torque is N, including the current engine torque M, the torque requested by the driving force control system to the engine is N, and the torque requested by the torque converter to the engine is M.
In the embodiment, whether the torque of an engine of a vehicle needs to be limited is determined according to the current temperature and the current temperature gradient, when the torque of the engine of the vehicle needs to be limited, a request corresponding to the torque is sent to the engine of the vehicle, the requested torque of the engine by other systems is obtained, whether the corresponding torque is smaller than all the requested torques is determined, and when the corresponding torque is smaller than all the requested torques, the engine is controlled to execute the corresponding torque, so that the control accuracy of the torque management system on the engine is improved, the abrasion caused by frequent change of the torque of the engine is reduced, and the reliability of a four-wheel drive system of the vehicle, particularly the torque management system is effectively improved.
S32: and sending overheating early warning to the vehicle according to the current temperature and the current temperature gradient, and exiting the four-wheel drive mode of the vehicle.
After the engine torque of the vehicle is limited according to the current temperature and the current temperature gradient, whether an overheat early warning needs to be sent to the vehicle is further judged according to the change of the temperature and the current temperature gradient, and the four-wheel drive mode of the vehicle is exited after the overheat early warning is sent to the vehicle, so that the temperature protection is carried out on the torque management system when the temperature of the torque management system is too high.
Specifically, when the current temperature is greater than the preset limit temperature, or when the current temperature is greater than the sixth preset temperature and the current temperature gradient is greater than the fourth preset gradient dT4, an overheating early warning is sent to the vehicle. The preset limit temperature is the highest limit temperature which can be accepted by the torque management system under the normal operation condition, and the sixth preset temperature is smaller than the preset limit temperature.
In the embodiment, after the four-wheel-drive torque distribution strategy of the torque management system is controlled according to the current temperature, the current temperature gradient and the current four-wheel-drive mode, the engine torque of the vehicle is limited according to the current temperature and the current temperature gradient, an overheating early warning is sent to the vehicle according to the current temperature and the current temperature gradient, and the four-wheel-drive mode of the vehicle is exited, so that the control accuracy of the torque management system on the engine is improved, the safety of the torque management system is improved, and the reliability of the four-wheel-drive system of the vehicle, particularly the torque management system, is effectively improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In one embodiment, a torque control device is provided, which corresponds to the torque control method in the above embodiments one to one. As shown in FIG. 5, the torque control arrangement includes an acquisition module 501 and a control module 502. The functional modules are explained in detail as follows:
an obtaining module 501, configured to obtain real-time driving state parameters of a vehicle, where the driving state parameters include: a current four-wheel drive mode, a current temperature of the torque management system, and a current temperature gradient of the torque management system;
a control module 502, configured to control a four-wheel-drive torque distribution policy of the torque management system according to the current temperature, the current temperature gradient, and the current four-wheel-drive mode, so that the torque management system operates according to the controlled four-wheel-drive torque distribution policy.
Wherein the control module 502 is specifically configured to:
determining whether a four-wheel-drive torque distribution strategy in the current four-wheel-drive mode needs to be switched according to the current temperature, the current temperature gradient and the current four-wheel-drive mode;
and when the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched, switching the four-wheel drive torque distribution strategy in the current four-wheel drive mode according to the current temperature and the current temperature gradient.
Wherein the four-wheel drive mode of the vehicle includes a first mode, a second mode and a third mode, and the determining whether the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature, the current temperature gradient and the current four-wheel drive mode is that the control module 502 is further configured to:
when the current four-wheel drive mode is the third mode, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched;
and when the current four-wheel drive mode is the first mode or the second mode, determining whether a four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature and the current temperature gradient.
Wherein the control module 502 is further specifically configured to:
determining a four-wheel-drive torque distribution strategy required to be used according to the current temperature and the current temperature gradient;
determining whether the temperature rise of the four-wheel-drive torque distribution strategy needing to be used is smaller than the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode;
if so, determining that the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched;
if not, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched.
The four-wheel-drive torque distribution strategy includes a first-stage strategy, a second-stage strategy and a third-stage strategy, in which calorific values are sequentially decreased, when the current four-wheel-drive mode is the first mode, the four-wheel-drive torque distribution strategy that needs to be used is determined according to the current temperature and the current temperature gradient, and the control module 502 is further specifically configured to:
when the current temperature and the current temperature gradient meet preset conditions, determining that the vehicle needs to use the third-level strategy, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval;
when the current temperature and the current temperature gradient do not meet the preset conditions and the current temperature is higher than a first preset temperature, determining that the vehicle needs to use the second-level strategy;
determining that the vehicle needs to use the first-level strategy when the current temperature is less than or equal to a first preset temperature.
The four-wheel-drive torque distribution strategy includes a first-stage strategy, a second-stage strategy and a third-stage strategy, in which calorific values are sequentially decreased, when the current four-wheel-drive mode is the second mode, the four-wheel-drive torque distribution strategy that needs to be used is determined according to the current temperature and the current temperature gradient, and the control module 502 is further specifically configured to:
when the current temperature and the current temperature gradient meet preset conditions, determining that the vehicle needs to use the third-level strategy, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval;
and when the current temperature and the current temperature gradient do not meet the preset condition, determining that the vehicle needs to use the second-stage strategy.
Wherein the control module 502 is further specifically configured to:
the switching the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode according to the current temperature and the current temperature gradient comprises the following steps:
determining whether the current temperature gradient is larger than the estimated temperature gradient after switching;
when the current temperature gradient is larger than the predicted temperature gradient after switching, switching the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode into the four-wheel-drive torque distribution strategy needing to be used;
and when the current temperature gradient is smaller than or equal to the predicted temperature gradient after switching, maintaining the original four-wheel drive torque distribution strategy in the current four-wheel drive mode.
For specific limitations of the torque control device, reference may be made to the limitations of the torque control method described above, and details thereof will not be repeated here. The various modules in the torque control apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a torque control device is provided, as shown in FIG. 6, comprising a processor, memory and computer program connected by a system bus. Wherein the processor of the torque control device is configured to provide computational and control capabilities. The memory of the torque control device includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The computer program is executed by a processor to implement a torque control method.
In one embodiment, a torque control apparatus is provided, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor when executing the computer program implementing the steps of:
acquiring real-time driving state parameters of a vehicle, wherein the driving state parameters comprise: a current four-wheel drive mode, a current temperature of the torque management system, and a current temperature gradient of the torque management system;
and controlling a four-wheel drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel drive mode, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy.
In one embodiment, a readable storage medium is provided, having stored thereon a computer program which, when executed by a processor, performs the steps of:
acquiring real-time driving state parameters of a vehicle, wherein the driving state parameters comprise: a current four-wheel drive mode, a current temperature of the torque management system, and a current temperature gradient of the torque management system;
and controlling a four-wheel drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel drive mode, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A torque control method, characterized by comprising:
acquiring real-time driving state parameters of a vehicle, wherein the driving state parameters comprise a current four-wheel drive mode, a current temperature of a torque management system and a current temperature gradient of the torque management system;
controlling a four-wheel drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient and the current four-wheel drive mode, so that the torque management system works according to the controlled four-wheel drive torque distribution strategy, and the method comprises the following steps:
determining whether a four-wheel-drive torque distribution strategy in the current four-wheel-drive mode needs to be switched according to the current temperature, the current temperature gradient and the current four-wheel-drive mode:
the four-wheel drive mode of the vehicle comprises a first mode, a second mode and a third mode, wherein the four-wheel drive intervention strength of the vehicle is increased in sequence, and when the current four-wheel drive mode is the third mode, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched;
when the current four-wheel drive mode is the first mode or the second mode, determining whether a four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature and the current temperature gradient;
and when the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched, switching the four-wheel drive torque distribution strategy in the current four-wheel drive mode according to the current temperature and the current temperature gradient.
2. The torque control method of claim 1, wherein the determining whether a four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature and the current temperature gradient comprises:
determining a four-wheel-drive torque distribution strategy required to be used according to the current temperature and the current temperature gradient;
determining whether the temperature rise of the four-wheel-drive torque distribution strategy needing to be used is smaller than the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode;
if so, determining that the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched;
if not, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched.
3. The torque control method of claim 2, wherein the four-wheel-drive torque distribution strategy comprises a first-stage strategy, a second-stage strategy and a third-stage strategy, heating values of which are sequentially decreased, and when the current four-wheel-drive mode is the first mode, the determining of the four-wheel-drive torque distribution strategy to be used according to the current temperature and the current temperature gradient comprises the following steps:
when the current temperature and the current temperature gradient meet preset conditions, determining that the vehicle needs to use the third-level strategy, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval;
when the current temperature and the current temperature gradient do not meet the preset conditions and the current temperature is higher than a first preset temperature, determining that the vehicle needs to use the second-level strategy;
determining that the vehicle needs to use the first-level strategy when the current temperature is less than or equal to a first preset temperature.
4. The torque control method of claim 2, wherein the four-wheel-drive torque distribution strategy comprises a first-stage strategy, a second-stage strategy and a third-stage strategy, heating values of which are sequentially decreased, and when the current four-wheel-drive mode is the second mode, the determining of the four-wheel-drive torque distribution strategy to be used according to the current temperature and the current temperature gradient comprises the following steps:
when the current temperature and the current temperature gradient meet preset conditions, determining that the vehicle needs to use the third-level strategy, wherein the preset conditions comprise a multi-level temperature interval and a temperature gradient interval corresponding to each temperature interval;
and when the current temperature and the current temperature gradient do not meet the preset condition, determining that the vehicle needs to use the second-stage strategy.
5. The torque control method of any one of claims 1-4, wherein said switching a four-wheel-drive torque split strategy in the current four-wheel-drive mode based on the current temperature and the current temperature gradient comprises:
determining whether the current temperature gradient is greater than the estimated temperature gradient after switching;
when the current temperature gradient is larger than the predicted temperature gradient after switching, switching the four-wheel-drive torque distribution strategy in the current four-wheel-drive mode into a four-wheel-drive torque distribution strategy required to be used;
and when the current temperature gradient is smaller than or equal to the predicted temperature gradient after switching, maintaining the original four-wheel drive torque distribution strategy in the current four-wheel drive mode.
6. The torque control method of claim 5, wherein after controlling a four-wheel-drive torque distribution strategy of the torque management system based on the current temperature, the current temperature gradient, and the current four-wheel-drive mode, the method further comprises:
limiting an engine torque of the vehicle according to the current temperature and the current temperature gradient;
and sending overheating early warning to the vehicle according to the current temperature and the current temperature gradient, and exiting the four-wheel drive mode of the vehicle.
7. The torque control method of claim 6, wherein said limiting engine torque of said vehicle based on said current temperature and said current temperature gradient comprises:
determining whether an engine torque of the vehicle needs to be limited according to the current temperature and the current temperature gradient;
when the torque of the engine of the vehicle needs to be limited, a request corresponding to the torque is sent to the engine of the vehicle;
acquiring the requested torque of other systems to the engine;
determining whether the corresponding torque is less than all of the requested torques;
and controlling the engine to execute the corresponding torque when the corresponding torque is smaller than all the requested torques.
8. A torque control device, comprising:
the acquisition module is used for acquiring real-time driving state parameters of the vehicle, and the driving state parameters comprise: a current four-wheel drive mode, a current temperature of the torque management system, and a current temperature gradient of the torque management system;
the control module is configured to control a four-wheel-drive torque distribution strategy of the torque management system according to the current temperature, the current temperature gradient, and the current four-wheel-drive mode, so that the torque management system operates according to the controlled four-wheel-drive torque distribution strategy, and includes:
determining whether a four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature, the current temperature gradient and the current four-wheel drive mode, wherein the determining comprises the following steps:
the four-wheel drive mode of the vehicle comprises a first mode, a second mode and a third mode, wherein the four-wheel drive intervention strength of the vehicle is sequentially increased, and when the current four-wheel drive mode is the third mode, the four-wheel drive torque distribution strategy in the current four-wheel drive mode does not need to be switched;
when the current four-wheel drive mode is the first mode or the second mode, determining whether a four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched according to the current temperature and the current temperature gradient;
and when the four-wheel drive torque distribution strategy in the current four-wheel drive mode needs to be switched, switching the four-wheel drive torque distribution strategy in the current four-wheel drive mode according to the current temperature and the current temperature gradient.
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| CN102826087B (en) * | 2012-08-31 | 2015-04-22 | 长城汽车股份有限公司 | Torque control method of automobile four-drive system |
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