CN115773362A - 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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- CN115773362A CN115773362A CN202211410698.5A CN202211410698A CN115773362A CN 115773362 A CN115773362 A CN 115773362A CN 202211410698 A CN202211410698 A CN 202211410698A CN 115773362 A CN115773362 A CN 115773362A
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Abstract
The invention discloses a transmission gear-shifting control method, a transmission gear-shifting control device and a vehicle, wherein the method comprises the following steps: acquiring oil temperature detection parameters and preset partition temperatures of a transmission; determining a transmission mode according to the oil temperature detection parameters and the preset partition temperature; obtaining shift associated parameters, the shift associated parameters including 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 the following steps: repeatedly performing a large accelerator loosening and stepping working condition and a low-speed large accelerator accelerating working condition; determining a target gear shifting strategy according to the gear shifting associated parameters, the target working condition and the transmission mode; upshift or downshift control is executed on the transmission according to the target shift strategy. The gear shifting control method of the transmission, disclosed by the invention, can effectively limit the oil temperature rise of the transmission, improve the gear shifting quality of the transmission, reduce the damage risk of wearing 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 gear shifting control method and device for a transmission and a vehicle.
Background
With the development of passenger car technology, the automatic transmission is widely popularized in the field of passenger cars, is low in driving difficulty and smooth in gear shifting, can be automatically switched to a proper gear according to the change of an accelerator and a brake, and greatly improves the driving performance of the vehicle.
In the existing shift control system of the automatic transmission, a shift line is related to two factors of an accelerator opening and a vehicle speed: the throttle opening is fixed, and the higher the vehicle speed is, the higher the corresponding gear is; at a fixed vehicle speed, the larger the accelerator opening, the lower the gear. For the control of the hydraulic torque converter, each gear can be independently set with a locking point and an unlocking point, and the locking and unlocking control of the hydraulic torque converter can be automatically carried out along with the change of the vehicle speed, the accelerator and the like.
Because the vehicle of the automatic transmission is easy to operate, only a driver needs to control an accelerator and a brake, part of drivers are more likely to have the conditions of low-speed large accelerator acceleration and violent driving by repeatedly stepping on and off a large accelerator during driving, a hydraulic torque converter and a clutch generate large heat in the gear lifting process with frequent working conditions, the upper limit of the heat dissipation capacity of the existing vehicle heat management system generally cannot cover the upper limit of the heat generation capacity of the transmission, so that the oil temperature is rapidly increased, oil temperature alarm and torque limitation are easily triggered, the oil temperature of the transmission is overhigh during driving, the gear shifting quality is greatly different from the normal oil temperature due to the reduction of the viscosity of the oil, the pressure of the heat dissipation system can be increased due to overhigh oil temperature for a long time, the durability of parts of the transmission is negatively affected, and the driving safety of the vehicle is affected.
Disclosure of Invention
The invention provides a transmission gear shifting control method, a transmission gear shifting control device and a vehicle.
In a first aspect, an embodiment of the present invention provides a transmission shift control method, including the steps of:
acquiring oil temperature detection parameters and preset partition temperatures 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 the following steps: a normal transmission mode, a first warming mode and a second warming mode;
obtaining shift associated parameters, the shift associated parameters including 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 the following steps: repeatedly performing a large accelerator loosening and stepping working condition and a low-speed large accelerator accelerating 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 on the transmission according to the target shift strategy.
Optionally, when the target operating condition is the repeated heavy throttle release operating condition, the target shift strategy includes:
determining whether an accelerator emergency release function is activated or not according to the gear shifting correlation parameters;
determining a target gear holding time and a target shift list of the transmission after the accelerator is released according to the transmission mode after the accelerator is released;
and executing gear shifting control on the transmission according to the target gear keeping time and the target gear shifting list.
Optionally, the accelerator opening variation parameter includes an accelerator retraction rate;
the determining whether to activate an accelerator release function according to the gear shift related parameter comprises:
acquiring a time threshold value of the change of the accelerator opening degree, 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 speed;
judging whether the timing time of the accelerator opening change reaches the time threshold value or not;
and determining whether to activate the accelerator emergency release function according to the judgment result.
Optionally, when the quick release throttle function is not activated, the method further includes:
determining a downshift vehicle speed corresponding to a downshift line with the same accelerator opening according to the transmission mode;
under the same accelerator opening, the downshift speed in the first warming mode is larger than the downshift speed in the conventional transmission mode, and the downshift speed in the second warming mode is larger than the downshift speed in the first warming mode.
Optionally, 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 comprises:
acquiring driving characteristic parameters of a driver;
determining a correction coefficient according to the driving characteristic parameter and the transmission mode;
correcting the target gear keeping time and the target gear shifting list according to the correction coefficient;
and executing gear shifting control on the transmission based on the corrected target gear maintaining time and the target gear shifting list.
Optionally, the target shift list includes: target gear, target upshift vehicle speed and target engine speed corresponding to the target gear one by one;
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 operating condition is the low-speed large throttle acceleration operating condition, the target shift strategy includes:
determining a target lockup range of a torque converter according to the transmission mode;
determining whether to start a locking strategy according to the opening degree of the accelerator;
and when the locking strategy is started, unlocking/locking control is executed according to the target locking range.
Optionally, the target lock-out range for the normal transmission mode is less than the target lock-out range for the first warm-up mode;
the target lock-out range of the first warming mode is smaller than the target lock-out range of the second warming mode.
Optionally, the method further includes:
determining the gear-up speed of different accelerator areas according to the accelerator opening;
wherein the upshift vehicle 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, where the first preset partition temperature is a partition temperature between the normal transmission mode and the first warming mode; the second preset partition temperature is a partition temperature between the first heating mode and the second heating 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 apparatus for executing the transmission shift control method according to the first aspect of the present invention, the apparatus including:
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 temperatures;
a transmission mode obtaining module, configured to determine a transmission mode according to the oil temperature detection parameter and the preset partition temperature, where the transmission mode at least includes: a normal transmission mode, a first warming mode and a second warming mode;
an operation parameter obtaining module, configured to obtain a shift association parameter, where the shift association parameter includes at least one of: real-time vehicle speed, real-time gear, accelerator opening change parameters and a hydraulic torque converter mark;
a working condition identification module, configured to determine a target working condition according to the shift correlation parameter, where the target working condition at least includes: repeatedly performing a large accelerator loosening and stepping working condition and a low-speed large accelerator accelerating working condition;
the gear shifting strategy acquisition module is used for determining a target gear shifting strategy according to the gear shifting associated parameter, the target working condition and the transmission mode;
and the gear shifting execution module is used for executing gear shifting up or gear shifting down 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: the transmission shift control device according to the second aspect of the invention is configured to execute the transmission shift control method according to the first aspect of the invention.
According to the technical scheme of the embodiment of the invention, the transmission gear-shifting control method is implemented, and the method determines the real-time transmission mode of a vehicle according to the oil temperature detection parameter and the preset zone temperature by acquiring the oil temperature detection parameter and the preset zone temperature of the transmission; the method comprises the steps of obtaining gear shifting related parameters of a transmission, and determining real-time target working conditions of a vehicle by combining the gear shifting related parameters, wherein the target working conditions at least comprise: repeatedly performing a large accelerator loosening and stepping working condition and a low-speed large accelerator accelerating working condition; determining a target gear shifting strategy according to the gear shifting associated parameters, the target working condition and the transmission mode; upshift or downshift control is executed on the transmission according to the target shift strategy. Through discernment vehicle operating mode and derailleur mode, implement the strategy of shifting of different grades, reduce derailleur self heat production, can effectively restrict the derailleur oil temperature and rise, promote the quality of shifting of derailleur, reduce the damage risk of the inside vulnerable part of derailleur, promote driving safety performance.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart of a transmission shift control method according to an embodiment of the present invention;
FIG. 2 is a flowchart of another transmission shift control method provided by 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 the present invention embodiment;
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 to make those skilled in the art better understand the technical solutions of the present invention, 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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or 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 is applicable to a case where oil temperature is controlled based on a shift strategy, and the method is executed by an automatic Transmission Control Unit (TCU).
As shown in fig. 1, the method comprises the steps of:
and S110, acquiring oil temperature detection parameters and preset partition temperatures of the transmission.
The oil temperature detection parameters of the transmission can be parameters such as real-time oil temperature of the cooling liquid measured by a temperature sensor. The preset zone temperature of the transmission refers to a parameter for classifying the oil temperature of the transmission.
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 a specific value thereof is not limited.
S120, determining a transmission mode according to the oil temperature detection parameters and the preset partition temperature, wherein the transmission mode at least comprises the following steps: a normal transmission mode, a first warming mode, and a second warming mode.
The oil temperature in the conventional transmission mode is lower than that in the first warming mode, and the oil temperature in the first warming mode is lower than that in the second warming mode.
In some embodiments, the preset zone temperature may be set as 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 the normal transmission mode and the first warming mode; the second preset partition temperature is a partition temperature between the first heating mode and the second heating mode; the value of the first preset partition temperature is smaller than the value of the second preset partition temperature. When the oil temperature detection parameter is smaller than a first preset subarea temperature, determining the current transmission mode as a conventional transmission mode; when the oil temperature detection parameter is greater than or equal to a first preset partition temperature and less than or equal to a second preset partition temperature, determining the current transmission mode as a first heating mode; and when the oil temperature detection parameter is greater than or equal to the second preset partition temperature, determining the current transmission mode as a second warming mode.
In the present invention, the first preset partition temperature and the second preset partition 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 parameters, and the first preset partition temperature and the second preset partition temperature are dynamically corrected according to the oil temperature change rate, so that delay of a target control strategy can be avoided, and further the control effect of the oil temperature can be prevented from being influenced.
In other embodiments, the preset zone temperatures may be set as temperature ranges, and one temperature range corresponds to one transmission mode, for example, the preset zone temperatures may include a first temperature range, a second temperature range and a third temperature range, any temperature value in the first temperature range is smaller than any temperature value in the second temperature range, and any temperature value in the second temperature range is smaller than any temperature value in the third temperature range. When the acquired transmission oil temperature detection parameter is in a first temperature interval, determining the current transmission mode as a conventional transmission mode. And when the acquired transmission oil temperature detection parameter is in the second temperature interval, determining the current transmission mode as a first warming mode. And when the acquired transmission oil temperature detection parameter is in a third temperature interval, determining the current transmission mode as a second warming mode.
S130, obtaining gear shifting associated parameters, wherein the gear shifting associated parameters comprise at least one of the following items: 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 the 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 internal calculation of the TCU. The real-time gear is the driving gear of the current vehicle, and the real-time gear and the hydraulic torque converter mark can be obtained from the interior of the TCU. The hydraulic torque converter is arranged at the foremost end of the automatic transmission, on one hand, the hydraulic torque converter transmits rotating speed and torque, on the other hand, the connection between the engine and the transmission is non-rigid, and when the target vehicle runs at low speed, the hydraulic torque converter is opened; when the target vehicle is running at high speed, the torque converter is closed, and the torque converter flag can be used for indicating the closed state of the torque converter, for example, if the torque converter flag is set to 1, that is, the torque converter is closed, it can be determined that the current target vehicle is in the high-speed running state; if the torque converter flag is set to 0, i.e., the torque converter is open, it is determined that the current target vehicle is 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: the large accelerator is repeatedly released and stepped on and the low-speed large accelerator is accelerated.
The repeated large-accelerator-off stepping working condition refers to a working condition that a target vehicle repeatedly performs large-accelerator acceleration to trigger power downshift in the driving process, and under the working condition, the accelerator opening and the accelerator opening change parameters of the vehicle are large, and the real-time vehicle speed, the real-time gear and other parameters are also large. The low-speed large accelerator acceleration working condition means that parameters such as real-time speed and real-time gear of a target vehicle are low, but parameters such as accelerator opening and accelerator opening variation parameters are large under the working condition.
In the step, calibration parameters of the accelerator opening, the vehicle speed, the gear and the hydraulic torque converter mark under the repeated large-accelerator releasing and stepping condition and the low-speed large-accelerator accelerating condition can be established through calibration, the gear shifting related parameters of the current target vehicle are compared with the calibration parameters, and the condition with the consistent parameter comparison is determined as the target 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 gear-down gear shifting strategy under a conventional transmission mode, a first temperature-raising mode and a second temperature-raising mode under the condition of repeatedly releasing and stepping the accelerator, and a gear-up gear shifting strategy under the conventional transmission mode, the first temperature-raising mode and the second temperature-raising mode under the condition of accelerating the low-speed accelerator. 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 vehicle speeds and accelerator opening degrees) in a target gear shifting strategy, the gear retaining time and the locking strategy of the hydraulic torque converter can be established through calibration, and the specific numerical values 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 in the driving process can be continuously monitored, typically, the shift related parameters include the accelerator opening and the throttle opening change rate, and whether the corresponding target shift strategy is activated or not is determined according to the monitoring.
And S160, performing up-shifting or down-shifting control on the transmission according to the target gear shifting strategy.
Specifically, under the low-speed large throttle acceleration working condition, the transmission is subjected to upshift control, and vehicle speed points corresponding to upshifts with the same throttle opening degree are adjusted along with the change of oil temperature so as to reduce the upshift probability in the large throttle acceleration process; under the working condition of repeatedly stepping on the accelerator with a large throttle, the downshift strategy is matched with the accelerator quick-release (fast off) function, the vehicle speed point corresponding to the same accelerator opening is adjusted to downshift along with the change of the oil temperature, and the downshift probability is reduced when the driver steps on the accelerator again.
According to the technical scheme of the embodiment of the invention, the working condition of the vehicle and the mode of the transmission are identified, the gear shifting strategies of 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 easily damaged parts in the transmission is reduced, and the driving safety performance is improved.
FIG. 2 is a flow chart of another transmission shift control method according to an embodiment of the present invention, and in the embodiment of FIG. 2, a specific implementation of a shift strategy under a repeated heavy throttle release condition is exemplarily shown.
As shown in fig. 2, when the target operating condition is a repetitive accelerator tip-in condition, the transmission shift control method includes the following steps:
s210, acquiring oil temperature detection parameters and preset partition temperatures of the transmission.
And S220, determining a transmission mode according to the oil temperature detection parameter and the preset partition temperature.
And S230, acquiring the gear shifting related parameters.
And S240, determining a target working condition according to the gear shifting related parameters.
And S250, determining a target gear shifting strategy according to the gear shifting related parameters, the target working condition and the transmission mode.
In the present embodiment, when the target operating condition is the repetitive heavy throttle release operating condition, step S260 is performed.
And S260, determining whether an accelerator emergency release function is activated or not according to the gear shifting related parameters.
The accelerator quick release function (fast off) refers to a strategy for optimizing an upshift parameter under the working condition of accelerator quick release, the current gear is kept for a period of time, and then an upshift action is performed, so that the driving performance is improved by shielding unnecessary gear shifting. Typically, upshift parameters for the accelerator tip-out function include, but are not limited to: gear hold time, engine speed and upshift test.
In the embodiment, the parameter of the accelerator tip-off function can be corrected according to the oil temperature detection parameter and the transmission mode.
And S270, after the accelerator pedal release function is activated, determining a target gear keeping time and a target gear shifting list of the transmission after the accelerator pedal release according to the transmission mode.
After the accelerator quick release function is activated, when the transmission mode enters a first heating mode from a conventional transmission mode and then enters a second heating mode, the holding time of a target gear after accelerator quick release can be prolonged, the specific prolonging time can be preset in advance, then a target gear shifting list is determined, and the corresponding engine rotating speed after the gear is shifted up is improved, so that the gear shifting probability or the gear shifting number when the accelerator is stepped on again is reduced.
And S280, executing gear shifting control on the transmission according to the target gear keeping time and the target gear shifting list.
And further performing corresponding upshifting or downshifting on the transmission according to the determined target gear keeping time and the target gear shifting list so as to reduce heat generation of the transmission caused by power downshifting.
And S290, performing upshift or downshift control on the transmission according to the target gear shifting strategy.
Specifically, under the repeated heavy-accelerator-off operating 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 warming mode or a second warming mode. The preset gear hold time is determined in conjunction with the current transmission mode. After the accelerator quick release function is activated, the transmission keeps the preset gear keeping time of a gear before the accelerator is retracted, then the transmission executes the gear-up operation according to a gear-shifting list (namely gear-shifting MAP under different vehicle speeds and accelerator opening degrees) in a target gear-shifting strategy, and the rotating speed of the engine is controlled in a certain area. Wherein a transmission mode corresponding to a high oil temperature maintains the previous gear longer. And if the driver does not have the follow-up operation of stepping on the accelerator any more, when the target vehicle is decelerated to the sliding downshift point of the current transmission mode in a sliding mode, the accelerator quick-release function is automatically quitted. If the driver presses the accelerator again during the gear control, it takes a certain time to exit the target shift strategy and execute a new upshift or downshift control of the transmission according to the target shift strategy of the current transmission mode.
Optionally, the accelerator opening variation parameter includes a throttle closing rate. The throttle speed receiving rate indicates the speed degree of the target vehicle, and the target working condition can be better determined according to the parameter.
FIG. 3 is a flow chart of yet another transmission shift control method provided by an embodiment of the invention, which exemplarily shows a specific implementation of determining whether to activate the accelerator tip-out function.
As shown in fig. 3, the step S260 specifically includes the following steps:
s261, acquiring a time threshold T1 of the accelerator opening degree change, wherein the time threshold T1 is positively correlated with the oil temperature detection parameter.
When the accelerator opening is in a certain determined interval and the closing speed of the accelerator opening is in a certain determined interval, the upshift command is temporarily shielded, the time duration when the accelerator opening is reduced to be lower than a given value is the accelerator opening change time, and the time threshold of the accelerator opening change can be obtained in advance. As the detected oil temperature parameter continuously rises, the corresponding accelerator opening change time threshold value also correspondingly increases, and the two values are in positive correlation.
And S262, determining whether to start the accelerator opening change timing according to the accelerator opening and the accelerator receiving speed.
And if the accelerator opening is larger than a first opening threshold value a and the closing speed of the accelerator opening is larger than a speed threshold value b, temporarily shielding the upshift instruction, and starting the accelerator opening change timing.
And S263, judging whether the timing time of the accelerator opening change reaches a time threshold value T1.
And S264, determining whether to activate the accelerator emergency release function according to the judgment result.
If the throttle opening is reduced to be lower than a second opening threshold c within the time threshold T1, activating an accelerator emergency release function; and if the throttle opening is not reduced to be lower than the second opening threshold c within the time threshold T1, the accelerator quick release function is not activated, and the shielding upshift function is cancelled.
It should be noted that the first opening threshold a, the speed threshold b, the second opening threshold c, and the time threshold T1 may be set by those skilled in the art according to the driving performance and the operating condition of the target vehicle, and specific values thereof are not limited.
Optionally, when the accelerator tip-off function is not activated, the transmission shift control method further includes: and determining the downshift vehicle speed corresponding to the same accelerator opening downshift line according to the transmission mode.
Under the same accelerator opening, the downshift vehicle speed in the first temperature-rising mode is larger than the downshift vehicle speed in the conventional transmission mode, and the downshift vehicle speed in the second temperature-rising mode is larger than the downshift vehicle speed in the first temperature-rising mode.
Specifically, when the accelerator quick release function is not activated, under the same accelerator opening, the downshift speed in the first temperature-rising mode is greater than the downshift speed in the conventional transmission mode, and the downshift speed in the second temperature-rising mode is greater than the downshift speed in the first temperature-rising mode, so that the downshift probability is reduced when the driver presses the accelerator again, the heat production 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, and as shown in fig. 4, after determining a target gear-holding time and a target shift list of the transmission after the throttle is released according to a transmission mode, the transmission shift control method further includes:
and S308, acquiring driving characteristic parameters of the driver.
The driving characteristic parameter can be a characteristic parameter representing the degree of violence of the driver in releasing the accelerator. The driving characteristic parameter of the driver can be embodied in the form of a counter, specifically, the counter is initialized to zero after the target vehicle is started or when the transmission mode is switched, and it is specified that in a time interval, the counter is increased by 1 every time the accelerator-off function is activated, and the counter is decreased by 1 if the accelerator-off function is not activated. The higher the counter value is accumulated, the higher the current degree of intense driving of the driver is represented.
And S309, determining a correction coefficient according to the driving characteristic parameter and the transmission mode.
Wherein, different transmission modes and different driving characteristic parameters are different corresponding to the determined correction factors. Each transmission mode sets a separate correction factor that is multiplied by the target gear hold time after the release of the throttle and a specific target shift list to obtain a corrected target gear hold time and shift speed.
And S310, correcting the target gear keeping 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 and the engine speed after the upshift corresponding to each gear in the corrected target shift list are. The driving characteristic parameters can maximally reduce the gear shifting times, control the oil temperature rising rate of the transmission, minimize the negative influence of violent driving on the whole vehicle and the transmission, and meet the power demand of a user for violent driving.
And S311, executing gear shifting control on the transmission based on the corrected target gear keeping time and the target gear shifting list.
Optionally, the target shift list includes: target gear, target upshift vehicle speed and target engine speed which correspond to the target gear one by one; and the target gear keeping time, the target upshift vehicle speed and the target engine rotating speed are positively correlated with the driving characteristic parameters.
The target gear is a gear to be reached in the transmission gear shifting under the current working condition and the transmission mode, and the target gear can be reached only when the corresponding upshift vehicle speed and the engine speed are reached in the gear shifting. The higher the accumulated number of the counter values in the driving characteristic parameters is, the higher the target gear holding time, the target upshift speed and the target engine speed are, the lower the target gear holding time, the target upshift speed and the target engine speed are, respectively.
FIG. 5 is a flowchart of another transmission shift control method according to an embodiment of the present invention, and is applicable to a low-speed large throttle acceleration condition as a target condition.
As shown in FIG. 5, when the target operating condition is a low speed large throttle acceleration condition, the target shift schedule includes:
and S450, determining a target locking range of the hydraulic torque converter according to the transmission mode.
Wherein the conventional transmission mode, the first warming mode and the second warming mode differ corresponding to a target lockup range of the torque converter. For example, in a conventional transmission mode, the target locking range of the hydraulic torque converter is 3-gear, and 1-gear and 2-gear are unlocking states, so that the dynamic property and the comfort of on-site starting acceleration can be improved; in the first temperature rising mode, when the opening degree of an accelerator is larger than a certain value and the vehicle speed is lower than a certain value, the target locking range of the hydraulic torque converter is 2-gear, and is still 3-gear to start locking when the opening degree of the accelerator is lower than the opening degree of the accelerator, the torque is relatively lower under the condition of low opening degree of the accelerator, the heat productivity is less, and the 3-gear to start locking is still used for ensuring the dynamic property and the comfort of low-speed starting; in the second warm-up mode, similar to the first warm-up mode, the 1-gear start lock is set in the low-vehicle-speed large throttle region, and the 3-gear start lock is still set in the small throttle region.
And S460, determining whether to start a locking strategy according to the opening degree of the accelerator.
For example, when the accelerator opening is larger than a preset opening threshold (for example, 50%) and the vehicle speed is lower than a preset vehicle speed threshold (for example, 20 km/h), it is determined that the target vehicle enters a low-speed large-accelerator acceleration condition, and a locking strategy is started. 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 condition, and not starting the locking strategy.
And S470, when the locking strategy is started, unlocking/locking control is executed according to the target locking range.
At the time of the start of the lockup strategy, a target lockup range of the torque converter is determined according to the transmission mode, and the corresponding lockup/unlocking operation is performed on the device.
Optionally, the target lock-out range for the conventional transmission mode is less than the target lock-out range for the first warm-up mode; the target blocking range of the first warming mode is smaller than the target blocking range of the second warming mode.
For example, the target lock-up range for the conventional transmission mode is 3 rd gear, the target lock-up range for the first warm-up mode is 2 nd gear, and the target lock-up range for the second warm-up mode is 3 rd gear. By setting the target locking ranges of the conventional transmission mode, the first warming mode and the second warming mode, the dynamic property and the comfort of the on-site starting acceleration and the low-speed starting can be improved.
Optionally, the transmission shift control method provided by the embodiment of the invention further includes: determining the upshifting speeds of different accelerator areas according to the accelerator opening; wherein the upshift vehicle speed is positively correlated with the accelerator opening.
The accelerator area refers to a certain numerical range of the accelerator opening, different numerical ranges correspond to different accelerator areas, and the up-shift vehicle speeds in different accelerator areas are different. The larger the accelerator opening, the higher the upshift speed, and vice versa.
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 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:
and the temperature detection module 11 is used for acquiring oil temperature detection parameters of the transmission.
And a partition temperature setting module 12, configured to obtain a preset partition temperature.
A transmission mode obtaining module 13, configured to determine a transmission mode according to the oil temperature detection parameter and the preset partition temperature, where the transmission mode at least includes: a normal transmission mode, a first warming mode, and a second warming mode.
An operation parameter obtaining module 14, configured to obtain a shift related parameter, where the shift related parameter includes at least one of: real-time vehicle speed, real-time gear, accelerator opening change parameters and a hydraulic torque converter mark.
A working condition identification module 15, configured to determine a target working condition according to the shift correlation parameter, where the target working condition at least includes: the working condition of repeatedly loosening and stepping the big throttle and the working condition of accelerating the big throttle at low speed.
And a gear shift strategy obtaining module 16, configured to determine a target gear shift strategy according to the gear shift relevant parameter, the target operating condition, and the transmission mode.
And a gear shifting execution module 17 for executing the gear shifting up or gear shifting down control on the transmission according to the target gear shifting strategy.
Specifically, under the low-speed large throttle acceleration working condition, the transmission is subjected to upshift control, and vehicle speed points corresponding to upshifts with the same throttle opening degree are adjusted along with the change of oil temperature so as to reduce the upshift probability in the large throttle acceleration process; under the working condition of repeatedly stepping on the accelerator with a large throttle, the downshift strategy is matched with the accelerator quick-release (fast off) function, the vehicle speed point corresponding to the same accelerator opening is adjusted to downshift along with the change of the oil temperature, and the downshift probability is reduced when the driver steps on the accelerator again.
In some embodiments, when the target operating condition is a repetitive heavy throttle tip-out condition, the target shift schedule includes: determining whether an accelerator emergency release function is activated or not according to the gear shift correlation parameters; after the accelerator tip-out function is activated, determining a target gear holding time and a target gear shifting list of the transmission after the accelerator tip-out according to the transmission mode; and executing gear shifting control on the transmission according to the target gear keeping time and the target gear shifting list.
In some embodiments, the accelerator opening change parameter comprises a throttle tip-in rate; determining whether to activate an accelerator release function according to the gear shifting related parameters, comprising: acquiring a time threshold value of the change of the opening degree of the accelerator, wherein the time threshold value is positively correlated with an oil temperature detection parameter; determining whether to start accelerator opening change timing or not according to the accelerator opening and the accelerator receiving speed; judging whether the timing time of the accelerator opening change reaches a time threshold value or not;
and determining whether to activate the accelerator emergency release function according to the judgment result.
In some embodiments, while the quick release throttle function is not activated, the method further comprises: determining a downshift vehicle speed corresponding to a downshift line with the same accelerator opening according to the transmission mode; under the same accelerator opening, the downshift vehicle speed in the first temperature-rising mode is larger than the downshift vehicle speed in the conventional transmission mode, and the downshift vehicle speed in the second temperature-rising mode is larger than the downshift vehicle speed in the first temperature-rising mode.
In some embodiments, after determining the target gear-hold time and the target shift list for the transmission after the tip-out based on the transmission mode, the method further comprises: acquiring driving characteristic parameters of a driver; determining a correction coefficient according to the driving characteristic parameter and the transmission mode; correcting the target gear keeping time and the target gear shifting list according to the correction coefficient; and executing gear shifting control on the transmission based on the corrected target gear maintaining time and the target gear shifting list.
In some embodiments, a target shift list, comprising: target gear, target upshift vehicle speed and target engine speed which correspond to the target gear one by one; and the target gear keeping time, the target upshift vehicle speed and the target engine rotating speed are positively correlated with the driving characteristic parameters.
In some embodiments, the target shift schedule includes, when the target operating condition is a low speed large throttle acceleration 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 opening degree of the accelerator; at the time of the start of the lockout strategy, the unlock/lockout control is performed according to the target lockout range.
In some embodiments, the target lock-out range for the conventional transmission mode is less than the target lock-out range for the first warm-up mode; the target lock-out range of the first warming mode is smaller than the target lock-out range of the second warming mode.
In some embodiments, the shift control method further comprises: determining the gear-up speed of different accelerator areas according to the accelerator opening; wherein the upshift vehicle speed is positively correlated with the accelerator opening.
In some embodiments, the preset zone temperature comprises 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 warming mode; the second preset partition temperature is a partition temperature between the first heating mode and the second heating 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.
Based on the same concept, the embodiment of the invention also provides a vehicle, which comprises: the transmission shift control device provided by the above-described embodiment of the present invention is configured to execute the transmission shift control method provided by any embodiment of the present invention. Therefore, the vehicle provided by the embodiment of the present invention also has the beneficial effects described in the above embodiments, and details are not repeated herein.
For example, the vehicle may be an automatic transmission automobile or the like.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A transmission shift control method characterized by comprising the steps of:
acquiring oil temperature detection parameters and preset partition temperatures 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 the following steps: a normal transmission mode, a first warming mode and a second warming mode;
obtaining shift related parameters, the shift related parameters including 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 the following steps: repeatedly performing a large accelerator loosening and stepping working condition and a low-speed large accelerator accelerating working condition;
determining a target gear shifting strategy according to the gear shifting related parameters, the target working condition and the transmission mode;
executing an upshift or downshift control on the transmission according to the target shift strategy.
2. The method of claim 1, wherein when the target operating condition is the repetitive heavy tip-out operating condition, the target shift schedule comprises:
determining whether an accelerator emergency release function is activated or not according to the gear shifting related parameters;
determining a target gear holding time and a target shift list of the transmission after the accelerator is released according to the transmission mode after the accelerator is released;
and executing gear shifting control on the transmission according to the target gear keeping time and the target gear shifting list.
3. The method of claim 2, wherein the throttle opening change parameter comprises a throttle rate;
the step of determining whether to activate an accelerator releasing function according to the gear shifting related parameters 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 speed;
judging whether the timing time of the accelerator opening change reaches the time threshold value or not;
and determining whether to activate the accelerator emergency release function according to the judgment result.
4. The method of claim 2, wherein while the accelerator tip-out function is not active, the method further comprises:
determining a downshift vehicle speed corresponding to a downshift line with the same accelerator opening according to the transmission mode;
under the same accelerator opening, the downshift speed in the first warming mode is larger than the downshift speed in the conventional transmission mode, and the downshift speed in the second warming mode is larger than the downshift speed in the first warming mode.
5. The method of claim 2, wherein after determining the target gear-hold time and target shift list for the transmission after the throttle is released based on the transmission mode, the method further comprises:
acquiring driving characteristic parameters of a driver;
determining a correction coefficient according to the driving characteristic parameter and the transmission mode;
correcting the target gear keeping time and the target gear shifting list according to the correction coefficient;
and executing gear shifting control on the transmission based on the corrected target gear keeping time and the target gear shifting list.
6. The method of claim 5, wherein the target shift list comprises: the target gear, and a target upshift vehicle speed and a target engine speed which correspond to the target gear one to one;
wherein the target gear-stage holding time, the target upshift vehicle speed, and the target engine rotation speed are positively correlated with the driving characteristic parameter.
7. The method of claim 1, wherein when the target operating condition is the low speed large throttle acceleration condition, the target shift schedule comprises:
determining a target lockup range of a torque converter according to the transmission mode;
determining whether to start a locking strategy according to the opening degree of the accelerator;
and when the locking strategy is started, unlocking/locking control is executed according to the target locking range.
8. The method of claim 7, wherein the target lock-out range for the normal transmission mode is less than the target lock-out range for the first warm-up mode;
the target lock-out range of the first warming mode is smaller than the target lock-out range of the second warming mode.
9. The method of claim 7, further comprising:
determining the gear-up speed of different accelerator areas according to the accelerator opening;
wherein the upshift vehicle speed is positively correlated with the accelerator opening.
10. The method according to any one of claims 1-9, wherein the preset zone temperature comprises a first preset zone temperature and a second preset zone temperature, wherein the first preset zone temperature is a zone temperature between the normal transmission mode and the first warming mode; the second preset partition temperature is a partition temperature between the first heating mode and the second heating mode;
the first preset sub-area temperature and the second preset sub-area temperature are inversely related to the oil temperature change rate of the oil temperature detection parameter.
11. A transmission shift control apparatus characterized by being used to execute the transmission shift control method according to any one of claims 1 to 10, the apparatus 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 temperatures;
a transmission mode obtaining module, configured to determine a transmission mode according to the oil temperature detection parameter and the preset partition temperature, where the transmission mode at least includes: a normal transmission mode, a first warming mode and a second warming mode;
an operation parameter obtaining module, configured to obtain shift relevant parameters, where the shift relevant parameters include 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, and the target working condition at least comprises the following steps: repeatedly performing a large accelerator loosening and stepping working condition and a low-speed large accelerator accelerating working condition;
the gear shifting strategy acquisition module is used for determining a target gear shifting strategy according to the gear shifting associated parameter, the target working condition and the transmission mode;
and the gear shifting execution module is used for executing gear shifting up or gear shifting down control on the transmission according to the target gear shifting strategy.
12. A vehicle, characterized by comprising: a transmission shift control device according to claim 11 for executing a transmission shift control method according to any one of claims 1 to 10.
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