CN115773362B - Transmission gear shifting control method and device and vehicle - Google Patents
Transmission gear shifting control method and device and vehicle Download PDFInfo
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- CN115773362B CN115773362B CN202211410698.5A CN202211410698A CN115773362B CN 115773362 B CN115773362 B CN 115773362B CN 202211410698 A CN202211410698 A CN 202211410698A CN 115773362 B CN115773362 B CN 115773362B
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Abstract
The invention discloses a transmission gear-shifting control method, a device and a vehicle, wherein the method comprises the steps of obtaining oil temperature detection parameters and preset partition temperatures of a transmission; the method comprises the steps of determining a transmission mode according to oil temperature detection parameters and preset partition temperatures, obtaining gear shifting related parameters, wherein the gear shifting related parameters comprise at least one of real-time vehicle speed, real-time gear, accelerator opening change parameters and hydraulic torque converter marks, determining target working conditions according to the gear shifting related parameters, wherein the target working conditions at least comprise repeated large accelerator loose stepping working conditions and low-speed large accelerator acceleration working conditions, determining a target gear shifting strategy according to the gear shifting related parameters, the target working conditions and the transmission mode, and executing upshift or downshift control on the transmission according to the target gear shifting strategy. The gear shifting control method of the transmission can effectively limit the oil temperature of the transmission to rise, improve the gear shifting quality of the transmission, reduce the damage risk of vulnerable parts in the transmission and improve the driving safety performance.
Description
Technical Field
The invention relates to the technical field of gear shifting control, in particular to a transmission gear shifting control method and device and a vehicle.
Background
With the development of passenger car technology, automatic transmissions are widely popularized in the field of passenger cars, the driving difficulty of the automatic transmissions is low, gear shifting is smooth, the automatic transmissions can be automatically switched to proper gears according to the change of an accelerator and a brake, and the driving performance of the vehicle is greatly improved.
In the existing automatic transmission gear-shifting control system, a gear-shifting line is related to two factors of accelerator opening and vehicle speed, namely, the higher the vehicle speed is, the higher the corresponding gear is, and the higher the accelerator opening is, the lower the gear is under the fixed vehicle speed. For the control of the hydraulic torque converter, each gear can be independently provided with a locking point and an unlocking point, and the hydraulic torque converter is also related to the speed of the vehicle and the throttle and can automatically perform locking and unlocking control along with the changes of the speed of the vehicle, the throttle and the like.
Because the vehicle of automatic transmission is easy to operate, only need driver to control throttle and brake, partial driver appears the heavy driving condition that the accelerator is accelerated at a low speed and the accelerator is stepped on repeatedly in the driving greatly more easily, hydraulic torque converter and clutch produce a large amount of heat in these two kinds of frequent upshift and downshift processes, the heat radiation capacity upper limit of current vehicle thermal management system has generally all covered the transmission heat production capacity upper limit, lead to the oil temperature to rise rapidly, trigger oil temperature warning and limit and turn round easily, the transmission oil temperature is too high in driving, the viscosity reduction of oil can lead to the shift quality to be very much than normal oil temperature difference, long-time oil temperature is too high can increase cooling system's pressure, produce negative effect to the durability of derailleur self spare part, influence vehicle driving safety.
Disclosure of Invention
The invention provides a transmission gear shifting control method, a device and a vehicle, wherein gear shifting strategies are adjusted in real time by identifying different working conditions, so that the control capability of the transmission on oil temperature is comprehensively improved, and the heat generation of the transmission is reduced.
In a first aspect, an embodiment of the present invention provides a transmission shift control method, including the steps of:
acquiring an oil temperature detection parameter and a preset partition temperature of the transmission;
determining a transmission mode according to the oil temperature detection parameter and the preset partition temperature, wherein the transmission mode at least comprises a conventional transmission mode, a first heating mode and a second heating mode;
Acquiring gear shifting related parameters, wherein the gear shifting related parameters comprise at least one of real-time vehicle speed, real-time gear, accelerator opening change parameters and a hydraulic torque converter mark;
determining a target working condition according to the gear shifting related parameters, wherein the target working condition at least comprises a repeated large accelerator loose stepping working condition and a low-speed large accelerator acceleration working condition;
Determining a target gear shifting strategy according to the gear shifting related parameters, the target working condition and the transmission mode;
And executing upshift or downshift control on the transmission according to the target gear shifting strategy.
Optionally, when the target working condition is the repeated large accelerator loose stepping working condition, the target gear shifting strategy includes:
Determining whether an emergency throttle release function is activated according to the gear shifting related parameters;
After the quick throttle release function is activated, determining a target gear holding time and a target gear shifting list of the transmission after the throttle release according to the transmission mode;
And executing shift control on the transmission according to the target gear maintaining time and the target shift list.
Optionally, the accelerator opening change parameter includes an accelerator receiving rate;
The step of determining whether to activate the quick release throttle function according to the gear shift association parameter comprises the following steps:
Acquiring a time threshold value of the change of the accelerator opening, wherein the time threshold value is positively correlated with the oil temperature detection parameter;
Determining whether to start accelerator opening change timing according to the accelerator opening and the accelerator receiving rate;
judging whether the timing time of the change of the accelerator opening reaches the time threshold value or not;
and determining whether to activate the quick release throttle function according to the judging result.
Optionally, when the quick release throttle function is not activated, the method further comprises:
determining a downshift vehicle speed corresponding to the same throttle opening downshift line according to the transmission mode;
Under the same accelerator opening degree, the speed of the downshift in the first temperature rising mode is larger than the speed of the downshift in the conventional transmission mode, and the speed of the downshift in the second temperature rising mode is larger than the speed of the downshift in the first temperature rising mode.
Optionally, after determining the target gear hold time and the target shift list of the transmission after the throttle release according to the transmission mode, the method further comprises:
Acquiring driving characteristic parameters of a driver;
Determining a correction factor according to the driving characteristic parameter and the transmission mode;
correcting the target gear holding time and the target gear shifting list according to the correction coefficient;
And executing shift control on the transmission based on the corrected target gear holding time and the target shift list.
Optionally, the target gear shifting list comprises target gear positions, and target upshift vehicle speeds and target engine speeds which are in one-to-one correspondence with the target gear positions;
Wherein the target gear holding time, the target upshift vehicle speed, and the target engine speed are positively correlated with the driving characteristic parameter.
Optionally, when the target working condition is the low-speed large accelerator accelerating working condition, the target gear shifting strategy includes:
determining a target lockup range of the torque converter according to the transmission mode;
determining whether to start a locking strategy according to the throttle opening;
and when the locking strategy is started, unlocking/locking control is executed according to the target locking range.
Optionally, the target lock-up range of the conventional transmission mode is smaller than the target lock-up range of the first warm-up mode;
The target lock-out range of the first temperature increasing mode is smaller than the target lock-out range of the second temperature increasing mode.
Optionally, the method further comprises:
Determining upshift speeds of different throttle areas according to the throttle opening;
wherein, the upshift speed is positively correlated with the accelerator opening.
Optionally, the preset partition temperature includes a first preset partition temperature and a second preset partition temperature, wherein the first preset partition temperature is a partition temperature between the conventional transmission mode and the first temperature increasing mode;
The first preset zone temperature and the second preset zone temperature are inversely related to the oil temperature change rate of the oil temperature detection parameter.
In a second aspect, an embodiment of the present invention provides a transmission shift control device for executing the transmission shift control method according to the first aspect of the present invention, where the device includes:
the temperature detection module is used for acquiring oil temperature detection parameters of the transmission;
The partition temperature setting module is used for acquiring preset partition temperature;
The transmission mode acquisition module is used for determining a transmission mode according to the oil temperature detection parameter and the preset partition temperature, wherein the transmission mode at least comprises a conventional transmission mode, a first heating mode and a second heating mode;
The operation parameter acquisition module is used for acquiring gear shifting related parameters, wherein the gear shifting related parameters comprise at least one of real-time vehicle speed, real-time gear, accelerator opening change parameters and a hydraulic torque converter mark;
the working condition identification module is used for determining a target working condition according to the gear shifting related parameters, wherein the target working condition at least comprises a repeated large accelerator loose stepping working condition and a low-speed large accelerator acceleration working condition;
The gear shifting strategy acquisition module is used for determining a target gear shifting strategy according to the gear shifting related parameters, the target working condition and the transmission mode;
and the gear shifting execution module is used for executing upshift or downshift control on the transmission according to the target gear shifting strategy.
In a third aspect, an embodiment of the present invention provides a vehicle, including a transmission shift control device according to the second aspect of the present invention, where the transmission shift control device is configured to execute the transmission shift control method according to the first aspect of the present invention.
According to the technical scheme, the transmission gear shifting control method is implemented, a real-time transmission mode of a vehicle is determined according to oil temperature detection parameters and preset partition temperatures of the transmission, gear shifting related parameters of the transmission are obtained, real-time target working conditions of the vehicle are determined by combining the gear shifting related parameters, the target working conditions at least comprise repeated large accelerator loose stepping working conditions and low-speed large accelerator acceleration working conditions, a target gear shifting strategy is determined according to the gear shifting related parameters, the target working conditions and the transmission mode, and upshift or downshift control is implemented on the transmission according to the target gear shifting strategy. By identifying the working condition of the vehicle and the mode of the transmission, the gear shifting strategies with different grades are implemented, the heat generation of the transmission is reduced, the oil temperature rise of the transmission can be effectively limited, the gear shifting quality of the transmission is improved, the damage risk of vulnerable parts in the transmission is reduced, and the driving safety performance is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a transmission shift control method provided by an embodiment of the present invention;
FIG. 2 is a flowchart of another transmission shift control method provided by an embodiment of the present invention;
FIG. 3 is a flowchart of yet another transmission shift control method provided by an embodiment of the present invention;
FIG. 4 is a flowchart of a transmission shift control method provided by an embodiment of the present invention;
FIG. 5 is a flowchart of another transmission shift control method provided by an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a transmission shift control device according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of a Transmission shift Control method according to an embodiment of the present invention, where the method may be applied to a case of controlling oil temperature based on a shift strategy, and the method may be performed by a Transmission-Control-Unit (TCU).
As shown in fig. 1, the method comprises the steps of:
S110, acquiring an oil temperature detection parameter and a preset partition temperature of the transmission.
The oil temperature detection parameter of the transmission may be a parameter such as a real-time oil temperature of the coolant measured by a temperature sensor. The preset zone temperature of the transmission refers to a parameter that divides the oil temperature of the transmission in stages.
In some embodiments, the preset partition temperature may be a determined temperature value or a temperature interval, and the preset partition temperature may be calibrated and preset in advance, and the specific value is not limited.
S120, determining a transmission mode according to the oil temperature detection parameter and the preset partition temperature, wherein the transmission mode at least comprises a conventional transmission mode, a first heating mode and a second heating mode.
Wherein the temperature of the oil in the conventional transmission mode is less than the temperature of the oil in the first warm-up mode, which is less than the temperature of the oil in the second warm-up mode.
In some embodiments, the preset zone temperature may be set to a boundary temperature value, for example, the preset zone temperature may include a first preset zone temperature and a second preset zone temperature, wherein the first preset zone temperature is a zone temperature between a conventional transmission mode and a first warming mode, the second preset zone temperature is a zone temperature between the first warming mode and the second warming mode, and the value of the first preset zone temperature is less than the value of the second preset zone temperature. The method includes determining a current transmission mode as a conventional transmission mode when an oil temperature detection parameter is less than a first preset zone temperature, determining the current transmission mode as a first warm-up mode when the oil temperature detection parameter is greater than or equal to the first preset zone temperature and less than or equal to a second preset zone temperature, and determining the current transmission mode as a second warm-up mode when the oil temperature detection parameter is greater than or equal to the second preset zone temperature.
In the present invention, the first preset zone temperature and the second preset zone temperature are inversely related to the oil temperature change rate of the oil temperature detection parameter. Specifically, the oil temperature change rate can be calculated according to the detected oil temperature detection parameter, and the first preset partition temperature and the second preset partition temperature are dynamically corrected according to the oil temperature change rate, so that the delay of the target control strategy can be avoided, and the control effect of the oil temperature is further affected.
In other embodiments, the preset zone temperatures may be set to be temperature intervals, where one temperature interval corresponds to one transmission mode, for example, the preset zone temperatures may include a first temperature interval, a second temperature interval, and a third temperature interval, where any temperature value of the first temperature interval is smaller than any temperature value of the second temperature interval, and any temperature value of the second temperature interval is smaller than any temperature value of the third temperature interval. When the acquired transmission oil temperature detection parameter is in the first temperature interval, the current transmission mode is determined as the normal transmission mode. When the acquired transmission oil temperature detection parameter is in the second temperature interval, the current transmission mode is determined as the first temperature increasing mode. When the acquired transmission oil temperature detection parameter is in the third temperature interval, the current transmission mode is determined as the second temperature increasing mode.
S130, acquiring gear shifting related parameters, wherein the gear shifting related parameters comprise at least one of real-time vehicle speed, real-time gear, accelerator opening change parameters and a hydraulic torque converter mark.
The real-time vehicle speed can be obtained according to the wheel rotating speed of the current vehicle, and the wheel rotating speed can be obtained by placing a sensor on a wheel. The accelerator opening CAN be directly obtained from a CAN line, and the accelerator opening change parameter CAN be the ratio of the accelerator opening to time, and CAN be obtained by the internal calculation processing of the TCU. The real-time gear is the driving gear of the current vehicle, and the real-time gear and the torque converter mark can be obtained from the inside of the TCU. The torque converter is arranged at the forefront end of the automatic transmission, on one hand, the rotating speed and torque are transmitted, on the other hand, the connection between the engine and the transmission is made to be non-rigid, when the target vehicle runs at a low speed, the torque converter is opened, when the target vehicle runs at a high speed, the torque converter is closed, a torque converter mark can be used for representing the closed state of the torque converter, for example, if the torque converter mark is set to be 1, namely, the torque converter is closed, the current target vehicle can be determined to be in a high-speed running state, and if the torque converter mark is set to be 0, namely, the torque converter is opened, the current target vehicle can be determined to be in a low-speed running state.
S140, determining a target working condition according to the gear shifting related parameters, wherein the target working condition at least comprises a repeated large accelerator loose stepping working condition and a low-speed large accelerator acceleration working condition.
The repeated large accelerator loose stepping working condition refers to the working condition that the target vehicle repeatedly accelerates the large accelerator to trigger the power downshift in the running process, and under the working condition, the accelerator opening and the accelerator opening change parameters of the vehicle are larger, and the parameters such as the real-time vehicle speed, the real-time gear and the like are also larger. The low-speed large accelerator acceleration working condition refers to the working condition that the parameters of the target vehicle such as real-time speed and real-time gear are lower, but the parameters of the accelerator opening, the accelerator opening change parameters and the like are larger.
In the step, the calibration parameters of the accelerator opening, the vehicle speed, the gear and the hydraulic torque converter mark under the repeated large accelerator loose stepping working condition and the low-speed large accelerator acceleration working condition can be established through calibration, the gear shifting related parameters of the current target vehicle are compared with the calibration parameters, and the working condition with the consistent parameter comparison is determined as the target working condition.
And S150, determining a target gear shifting strategy according to the gear shifting related parameters, the target working condition and the transmission mode.
The target gear shifting strategy comprises a conventional transmission mode, a first temperature rising mode and a second temperature rising mode under the repeated large accelerator loose stepping working condition, and an upshift gear shifting strategy under the conventional transmission mode, the first temperature rising mode and the second temperature rising mode under the low-speed large accelerator acceleration working condition. Under different target working conditions and different transmission modes, the engine speed and the gear shifting speed of a gear shifting list (namely, gear shifting MAP under different speeds and accelerator opening degrees) in a target gear shifting strategy, the gear holding time and the locking strategy of the hydraulic torque converter can be established through calibration, and specific numerical values of the gear shifting strategy are not limited.
In this step, after the target working condition and the transmission mode are identified, the shift related parameters of the target vehicle driving process may be continuously monitored, typically, the shift related parameters include the accelerator opening and the change rate of the accelerator opening, and whether to activate the corresponding target shift strategy is determined according to the monitoring.
And S160, executing upshift or downshift control on the transmission according to the target gear shifting strategy.
Specifically, under the working condition of low-speed large accelerator acceleration, upshift control is executed on the transmission, vehicle speed points corresponding to upshift with the same accelerator opening degree are adjusted along with oil temperature change so as to reduce upshift probability in the process of large accelerator acceleration, under the working condition of repeated large accelerator stepping-down, a downshift strategy is matched with an accelerator stepping-down (fast off) function, vehicle speed points corresponding to downshift with the same accelerator opening degree are adjusted along with oil temperature change so as to reduce downshift probability when a driver steps down the accelerator again.
According to the technical scheme, the vehicle working condition and the transmission mode are identified, the gear shifting strategies with different grades are implemented, the heat generation of the transmission is reduced, the oil temperature rise of the transmission can be effectively limited, the gear shifting quality of the transmission is improved, the damage risk of vulnerable parts in the transmission is reduced, and the driving safety performance is improved.
Fig. 2 is a flowchart of another transmission shift control method provided by the embodiment of the present invention, in the embodiment of fig. 2, a specific implementation of a shift strategy under a repeated large throttle loose-step condition is exemplarily shown.
As shown in fig. 2, when the target condition is a repeated large accelerator loose-stepping condition, the transmission shift control method includes the following steps:
S210, acquiring an oil temperature detection parameter and a preset partition temperature of the transmission.
S220, determining a transmission mode according to the oil temperature detection parameter and the preset partition temperature.
S230, acquiring gear shifting related parameters.
S240, determining a target working condition according to the gear shifting association parameters.
S250, determining a target gear shifting strategy according to the gear shifting related parameters, the target working condition and the transmission mode.
In this embodiment, when the target operating condition is the repeated large accelerator pedal release operating condition, step S260 is executed.
And S260, determining whether to activate the quick release throttle function according to the gear shift related parameters.
The fast off function refers to a strategy of optimizing an upshift parameter under the fast off condition, and keeps the current gear for a period of time and then performs upshift action, so that the drivability is improved by shielding unnecessary gear shifting. Typically, upshift parameters for the quick release throttle function include, but are not limited to, gear hold time, engine speed, and upshift test.
In this embodiment, the parameters of the quick throttle release function may be corrected according to the oil temperature detection parameter and the transmission mode.
S270, after the accelerator release function is activated, determining target gear holding time and a target gear shifting list of the transmission after accelerator release according to the transmission mode.
After the accelerator release function is activated, when the transmission mode enters the first temperature rising mode from the conventional transmission mode and then enters the second temperature rising mode, the holding time of the target gear after the accelerator release is prolonged, the specific prolonged time can be preset in advance, then a target gear shifting list is determined, the corresponding engine rotating speed after the gear is increased, and therefore the gear shifting probability or the gear shifting number when the accelerator is stepped on again is reduced.
And S280, performing gear shifting control on the transmission according to the target gear maintaining time and the target gear shifting list.
And further performing corresponding upshift or downshift operation on the transmission according to the determined target gear holding time and the target gear shifting list so as to reduce transmission heat generation caused by power downshift.
And S290, executing upshift or downshift control on the transmission according to the target gear shifting strategy.
Specifically, under the repeated large accelerator loose stepping condition, the current transmission mode is identified according to the oil temperature detection parameter and the preset partition temperature, and for example, the transmission mode can be any one of a conventional transmission mode, a first temperature raising mode or a second temperature raising mode. The preset gear hold time is determined in conjunction with the current transmission mode. After the quick throttle release function is activated, the transmission keeps the preset gear holding time of the gear before the throttle is retracted unchanged, and then upshift operation is performed according to a gear shift list (namely gear shift MAP under different vehicle speeds and throttle opening degrees) in a target gear shift strategy, so that the rotation speed of the engine is controlled in a certain area. Wherein the transmission mode corresponding to the high oil temperature is maintained for a longer period of time in the previous gear. If the driver does not have the subsequent operation of stepping on the accelerator, the accelerator release function automatically exits when the target vehicle is coasted down to the coast down point of the current transmission mode. If the driver depresses the accelerator again during the gear control, it is necessary to delay for a certain time, exit the target shift strategy, and perform a new upshift or downshift control for the transmission according to the target shift strategy of the current transmission mode.
Optionally, the accelerator opening variation parameter includes a throttle receiving rate. The throttle receiving speed represents the speed of the target vehicle, and the target working condition can be better determined according to the parameter.
Fig. 3 is a flowchart of still another transmission shift control method according to an embodiment of the present invention, which schematically illustrates a specific implementation of determining whether to activate the quick release throttle function.
As shown in fig. 3, the step S260 specifically includes the following steps:
s261, acquiring a time threshold value T1 of the accelerator opening change, wherein the time threshold value T1 is positively correlated with the oil temperature detection parameter.
In the case where the accelerator opening is within a certain determined section and the closing rate of the accelerator opening is within a certain determined section, the upshift instruction is temporarily masked, the duration when the accelerator opening falls below a given value is the accelerator opening change time, and the time threshold of the accelerator opening change may be acquired in advance. As the detected oil temperature parameter continuously rises, the corresponding throttle opening change time threshold value also correspondingly increases, and the two values are positively correlated.
S262, determining whether to start the accelerator opening change timing according to the accelerator opening and the accelerator receiving speed.
If the accelerator opening is greater than the first opening threshold a and the closing rate of the accelerator opening is greater than the rate threshold b, temporarily shielding the upshift command and starting the accelerator opening change timing.
S263, judging whether the timing time of the accelerator opening change reaches a time threshold T1.
S264, determining whether to activate the quick release throttle function according to the judging result.
And if the accelerator opening is not reduced to be lower than the second opening threshold value c in the time threshold value T1, the quick release accelerator function is not activated, and the function of shielding upshift is canceled.
It should be noted that, the first opening threshold value a, the speed threshold value b, the second opening threshold value c, and the time threshold value T1 may be set by those skilled in the art according to the driving performance and the working condition of the target vehicle, and specific numerical values thereof are not limited.
Optionally, when the quick throttle function is not activated, the transmission gear shifting control method further comprises the step of determining a downshift vehicle speed corresponding to the same throttle opening downshift line according to a transmission mode.
Under the same accelerator opening degree, the speed of the downshift in the first temperature rising mode is larger than the speed of the downshift in the normal speed changer mode, and the speed of the downshift in the second temperature rising mode is larger than the speed of the downshift in the first temperature rising mode.
Specifically, when the quick throttle releasing function is not activated, under the same throttle opening, the speed of the downshift in the first temperature rising mode is larger than the speed of the downshift in the conventional transmission mode, and the speed of the downshift in the second temperature rising mode is larger than the speed of the downshift in the first temperature rising mode, so that the probability of downshift is reduced when the driver steps on the throttle again, the heat generation amount is reduced, and the temperature rising rate is effectively controlled.
Fig. 4 is a flowchart of a transmission shift control method according to an embodiment of the present invention, as shown in fig. 4, after determining a target gear holding time and a target shift list of a transmission after a throttle is released according to a transmission mode, the transmission shift control method further includes:
S308, acquiring driving characteristic parameters of a driver.
The driving characteristic parameter can be a characteristic parameter for representing the intensity of the driver stepping on the accelerator. The driving characteristic parameters of the driver can be embodied in a counter, specifically, the counter is initialized to zero after the target vehicle is started or when the transmission mode is switched, and the counter is increased by 1 when the quick throttle function is activated once and is decreased by 1 when the quick throttle function is not activated in a time interval. The higher the counter value is accumulated, the higher the driver's current aggressive driving level is characterized.
S309, determining a correction coefficient according to the driving characteristic parameter and the transmission mode.
Wherein, different transmission modes and different driving characteristic parameters, the corresponding determined correction coefficients are different. And setting an independent correction coefficient for each transmission mode, and multiplying the correction coefficient by the target gear holding time after the accelerator is released and a specific target gear shifting list to obtain the corrected target gear holding time and the gear shifting vehicle speed.
And S310, correcting the target gear holding time and the target gear shifting list according to the correction coefficient.
The longer the target gear holding time corresponding to the correction coefficient is, the higher the upshift vehicle speed corresponding to each gear in the corrected target gear shift list and the engine speed after upshift are. The driving characteristic parameters can maximally reduce the gear shifting times, control the temperature rise and the speed rise of the transmission oil, minimize the negative influence of the intense driving on the whole vehicle and the transmission, and simultaneously meet the power requirements of the intense driving users.
And S311, performing shift control on the transmission based on the corrected target gear holding time and the target shift list.
The target gear shifting list comprises target gears, target upshift vehicle speeds and target engine speeds, wherein the target upshift vehicle speeds and the target engine speeds correspond to the target gears one by one, and the target gear holding time, the target upshift vehicle speeds and the target engine speeds are positively related to driving characteristic parameters.
The target gear, namely the gear which the transmission is required to reach in the current working condition and the transmission mode, can be reached only when the corresponding upshift vehicle speed and engine speed are required to be reached during gear shifting. The higher the counter value in the driving characteristic parameter is accumulated, the target gear holding time, the target upshift vehicle speed and the target engine speed are correspondingly increased, and otherwise, the target gear holding time, the target upshift vehicle speed and the target engine speed are decreased.
Fig. 5 is a flowchart of another transmission shift control method provided by an embodiment of the present invention, which is applicable to a low-speed large-accelerator acceleration condition as a target condition.
As shown in fig. 5, when the target operating condition is a low-speed large accelerator acceleration operating condition, the target shift strategy includes:
s450, determining a target locking range of the hydraulic torque converter according to the transmission mode.
Wherein the target lockup ranges of the conventional transmission mode, the first temperature increasing mode, and the second temperature increasing mode corresponding to the torque converter are different. The hydraulic torque converter is characterized in that a target locking range of the hydraulic torque converter is 3 gears, 1 gear and 2 gear are unlocked, power performance and comfort of in-situ starting acceleration can be improved, the target locking range of the hydraulic torque converter is 2 gears when the accelerator opening is larger than a certain value and the vehicle speed is lower than a certain value in a first heating mode, the target locking range of the hydraulic torque converter is still 3 gears and is still locked when the accelerator opening is lower than the accelerator opening, torque is relatively low under the low accelerator opening, heating value is low, the 3 gears and the locking are still used for guaranteeing the power performance and the comfort of low-speed starting, and the low accelerator area is still 3 gears and is still locked when the low vehicle speed and the large accelerator area is set to be 1 gear and similar to the first heating mode in a second heating mode.
S460, determining whether to start a locking strategy according to the opening degree of the accelerator.
For example, when the accelerator opening is greater than a preset opening threshold (e.g., 50%), and the vehicle speed is less than a preset vehicle speed threshold (e.g., 20 km/h), it is determined that the target vehicle enters a low-speed large-accelerator acceleration condition, and a locking strategy is initiated. And when the accelerator opening is lower than a preset opening threshold (for example, 50%), or the vehicle speed is higher than a preset vehicle speed threshold (for example, 20 km/h), determining that the target vehicle does not enter a low-speed large accelerator acceleration working condition, and not starting a locking strategy.
S470, when the locking strategy is started, unlocking/locking control is executed according to the target locking range.
When the lockup strategy is activated, a target lockup range of the torque converter is determined according to the transmission mode, and corresponding unlocking/lockup operations are performed on the torque converter.
Optionally, the target lock-up range of the conventional transmission mode is less than the target lock-up range of the first warm-up mode, which is less than the target lock-up range of the second warm-up mode.
For example, the target lockup range for the conventional transmission mode is 3, the target lockup range for the first warm-up mode is 2, and the target lockup range for the second warm-up mode is 3. By setting the target lock-up ranges of the conventional transmission mode, the first temperature increase mode, and the second temperature increase mode, the power performance and the comfort of the in-place start acceleration and the low-speed start can be improved.
Optionally, the transmission gear shifting control method further comprises the step of determining upshift speeds of different accelerator areas according to the accelerator opening, wherein the upshift speeds are positively correlated with the accelerator opening.
The accelerator region is a certain numerical value section of the accelerator opening, different numerical value sections correspond to different accelerator regions, and upshift speeds in different accelerator regions are different. The larger the accelerator opening is, the higher the upshift speed is, and the lower the upshift speed is, otherwise.
Based on the same inventive concept, the invention also provides a transmission gear-shifting control device, which can execute the transmission gear-shifting control method provided by the embodiment, and has the corresponding functional modules and beneficial effects of the execution method.
Fig. 6 is a schematic structural diagram of a transmission shift control device according to an embodiment of the present invention.
As shown in fig. 6, the transmission shift control device includes:
the temperature detection module 11 is used for acquiring an oil temperature detection parameter of the transmission.
The partition temperature setting module 12 is configured to obtain a preset partition temperature.
The transmission mode acquisition module 13 is configured to determine a transmission mode according to the oil temperature detection parameter and a preset zone temperature, where the transmission mode includes at least a normal transmission mode, a first temperature increasing mode, and a second temperature increasing mode.
The operation parameter acquisition module 14 is configured to acquire a shift related parameter, where the shift related parameter includes at least one of a real-time vehicle speed, a real-time gear, an accelerator opening variation parameter, and a torque converter flag.
The working condition identification module 15 is used for determining a target working condition according to the gear shift related parameters, wherein the target working condition at least comprises a repeated large accelerator loose stepping working condition and a low-speed large accelerator acceleration working condition.
The gear shift strategy acquisition module 16 is configured to determine a target gear shift strategy according to the gear shift related parameter, the target operating condition and the transmission mode.
The shift execution module 17 is configured to execute upshift or downshift control of the transmission according to a target shift strategy.
Specifically, under the working condition of low-speed large accelerator acceleration, upshift control is executed on the transmission, vehicle speed points corresponding to upshift with the same accelerator opening degree are adjusted along with oil temperature change so as to reduce upshift probability in the process of large accelerator acceleration, under the working condition of repeated large accelerator stepping-down, a downshift strategy is matched with an accelerator stepping-down (fast off) function, vehicle speed points corresponding to downshift with the same accelerator opening degree are adjusted along with oil temperature change so as to reduce downshift probability when a driver steps down the accelerator again.
In some embodiments, when the target operating condition is a repeated large throttle loose-step operating condition, the target gear shifting strategy comprises determining whether to activate an emergency release throttle function according to a gear shifting related parameter, determining a target gear holding time and a target gear shifting list of the transmission after the transmission is released according to a transmission mode after the emergency release throttle function is activated, and executing gear shifting control on the transmission according to the target gear holding time and the target gear shifting list.
In some embodiments, the accelerator opening change parameter comprises an accelerator receiving rate, determining whether to activate an emergency accelerator release function according to the gear shift association parameter, wherein the method comprises the steps of obtaining a time threshold value of accelerator opening change, which is positively correlated with an oil temperature detection parameter, determining whether to start accelerator opening change timing according to the accelerator opening and the accelerator receiving rate, and judging whether the timing time of accelerator opening change reaches the time threshold value;
and determining whether to activate the quick release throttle function according to the judging result.
In some embodiments, when the quick throttle function is not activated, the method further comprises determining a downshift vehicle speed corresponding to a downshift line with the same throttle opening according to the transmission mode, wherein the downshift vehicle speed in the first warm-up mode is greater than the downshift vehicle speed in the normal transmission mode and the downshift vehicle speed in the second warm-up mode is greater than the downshift vehicle speed in the first warm-up mode.
In some embodiments, after determining the target gear hold time and the target shift list of the transmission after the throttle is released according to the transmission mode, the method further includes obtaining driving characteristic parameters of a driver, determining correction coefficients according to the driving characteristic parameters and the transmission mode, correcting the target gear hold time and the target shift list according to the correction coefficients, and performing shift control on the transmission based on the corrected target gear hold time and the target shift list.
In some embodiments, the target gear shift list comprises target gears, target upshift speeds and target engine speeds which are in one-to-one correspondence with the target gears, wherein the target gear holding time, the target upshift speeds and the target engine speeds are positively correlated with driving characteristic parameters.
In some embodiments, the target shift strategy includes determining a target lockup region of the torque converter according to the transmission mode when the target operating condition is a low-speed, large-throttle acceleration operating condition, determining whether to activate the lockup strategy according to the throttle opening, and executing an unlock/lockup control according to the target lockup region when the lockup strategy is activated.
In some embodiments, the target lock-up range of the conventional transmission mode is less than the target lock-up range of the first warm-up mode, which is less than the target lock-up range of the second warm-up mode.
In some embodiments, the gear shifting control method further comprises determining upshift speeds of different accelerator areas according to the accelerator opening degrees, wherein the upshift speeds are positively correlated with the accelerator opening degrees.
In some embodiments, the preset zone temperatures include a first preset zone temperature and a second preset zone temperature, wherein the first preset zone temperature is a zone temperature between a conventional transmission mode and a first warm-up mode, the second preset zone temperature is a zone temperature between the first warm-up mode and the second warm-up mode, and the first preset zone temperature and the second preset zone temperature are inversely related to an oil temperature change rate of the oil temperature detection parameter.
Based on the same conception, the embodiment of the invention also provides a vehicle, which comprises the transmission gear shifting control device provided by the embodiment of the invention, wherein the transmission gear shifting control device is used for executing the transmission gear shifting control method provided by any embodiment of the invention. Therefore, the vehicle provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and will not be described herein.
By way of example, the vehicle may be a vehicle such as an automatic transmission automobile.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (11)
1. A transmission shift control method, characterized by comprising the steps of:
acquiring an oil temperature detection parameter and a preset partition temperature of the transmission;
determining a transmission mode according to the oil temperature detection parameter and the preset partition temperature, wherein the transmission mode at least comprises a conventional transmission mode, a first heating mode and a second heating mode;
Acquiring gear shifting related parameters, wherein the gear shifting related parameters comprise at least one of real-time vehicle speed, real-time gear, accelerator opening change parameters and a hydraulic torque converter mark;
determining a target working condition according to the gear shifting related parameters, wherein the target working condition at least comprises a repeated large accelerator loose stepping working condition and a low-speed large accelerator acceleration working condition;
Determining a target gear shifting strategy according to the gear shifting related parameters, the target working condition and the transmission mode;
executing upshift or downshift control for the transmission according to the target shift strategy;
Wherein, when the target working condition is the repeated large accelerator loose stepping working condition, the target gear shifting strategy comprises:
Determining whether an emergency throttle release function is activated according to the gear shifting related parameters;
After the quick throttle release function is activated, determining a target gear holding time and a target gear shifting list of the transmission after the throttle release according to the transmission mode;
And executing shift control on the transmission according to the target gear maintaining time and the target shift list.
2. The method according to claim 1, wherein the accelerator opening variation parameter comprises a throttle take-up rate;
The step of determining whether to activate the quick release throttle function according to the gear shift association parameter comprises the following steps:
Acquiring a time threshold value of the change of the accelerator opening, wherein the time threshold value is positively correlated with the oil temperature detection parameter;
Determining whether to start accelerator opening change timing according to the accelerator opening and the accelerator receiving rate;
judging whether the timing time of the change of the accelerator opening reaches the time threshold value or not;
and determining whether to activate the quick release throttle function according to the judging result.
3. The method of claim 1, wherein when the tip-out function is not activated, the method further comprises:
determining a downshift vehicle speed corresponding to the same throttle opening downshift line according to the transmission mode;
Under the same accelerator opening degree, the speed of the downshift in the first temperature rising mode is larger than the speed of the downshift in the conventional transmission mode, and the speed of the downshift in the second temperature rising mode is larger than the speed of the downshift in the first temperature rising mode.
4. The method of claim 1, wherein after determining a target gear hold time and a target shift list of the transmission after a throttle release according to the transmission mode, the method further comprises:
Acquiring driving characteristic parameters of a driver;
Determining a correction factor according to the driving characteristic parameter and the transmission mode;
correcting the target gear holding time and the target gear shifting list according to the correction coefficient;
And executing shift control on the transmission based on the corrected target gear holding time and the target shift list.
5. The method of claim 4, wherein the target shift list includes target gear positions, and target upshift vehicle speeds and target engine speeds that are in one-to-one correspondence with the target gear positions;
Wherein the target gear holding time, the target upshift vehicle speed, and the target engine speed are positively correlated with the driving characteristic parameter.
6. The method of claim 1, wherein the target shift strategy comprises, when the target operating condition is the low-speed, high-throttle acceleration operating condition:
determining a target lockup range of the torque converter according to the transmission mode;
determining whether to start a locking strategy according to the throttle opening;
and when the locking strategy is started, unlocking/locking control is executed according to the target locking range.
7. The method of claim 6, wherein a target lock-up range of the conventional transmission mode is less than a target lock-up range of the first warm-up mode;
The target lock-out range of the first temperature increasing mode is smaller than the target lock-out range of the second temperature increasing mode.
8. The method as recited in claim 6, further comprising:
Determining upshift speeds of different throttle areas according to the throttle opening;
wherein, the upshift speed is positively correlated with the accelerator opening.
9. The method of any one of claims 1-8, wherein the preset zone temperatures include a first preset zone temperature and a second preset zone temperature, wherein the first preset zone temperature is a zone temperature between the conventional transmission mode and the first warm-up mode;
The first preset zone temperature and the second preset zone temperature are inversely related to the oil temperature change rate of the oil temperature detection parameter.
10. A transmission shift control device for performing the transmission shift control method according to any one of claims 1 to 9, the device comprising:
the temperature detection module is used for acquiring oil temperature detection parameters of the transmission;
The partition temperature setting module is used for acquiring preset partition temperature;
The transmission mode acquisition module is used for determining a transmission mode according to the oil temperature detection parameter and the preset partition temperature, wherein the transmission mode at least comprises a conventional transmission mode, a first heating mode and a second heating mode;
The operation parameter acquisition module is used for acquiring gear shifting related parameters, wherein the gear shifting related parameters comprise at least one of real-time vehicle speed, real-time gear, accelerator opening change parameters and a hydraulic torque converter mark;
the working condition identification module is used for determining a target working condition according to the gear shifting related parameters, wherein the target working condition at least comprises a repeated large accelerator loose stepping working condition and a low-speed large accelerator acceleration working condition;
the gear shifting strategy acquisition module is used for determining a target gear shifting strategy according to the gear shifting related parameters, the target working condition and the transmission mode, wherein when the target working condition is the repeated large accelerator stepping-on working condition, the target gear shifting strategy comprises the steps of determining whether an emergency accelerator releasing function is activated according to the gear shifting related parameters, determining target gear holding time and a target gear shifting list of the transmission after an oil door is released according to the transmission mode after the emergency accelerator releasing function is activated, and executing gear shifting control on the transmission according to the target gear holding time and the target gear shifting list;
and the gear shifting execution module is used for executing upshift or downshift control on the transmission according to the target gear shifting strategy.
11. A vehicle comprising the transmission shift control device according to claim 10 for executing the transmission shift control method according to any one of claims 1 to 9.
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