Transmission shift control method, device and vehicle

Abstract

The present invention discloses a transmission shift control method, device and vehicle, the method comprising: obtaining oil temperature detection parameters and preset partition temperature of the transmission; determining the transmission mode according to the oil temperature detection parameters and the preset partition temperature; obtaining shift-related parameters, the shift-related parameters including at least one of the following: real-time vehicle speed, real-time gear position, throttle opening, throttle opening change parameter and torque converter flag; determining target working conditions according to the shift-related parameters, the target working conditions at least including: repeated large throttle release working conditions and low-speed large throttle acceleration working conditions; determining a target shift strategy according to the shift-related parameters, the target working conditions and the transmission mode; and performing upshift or downshift control on the transmission according to the target shift strategy. The transmission shift control method disclosed in the present invention can effectively limit the increase of transmission oil temperature, improve the shift quality of the transmission, reduce the risk of damage to the internal wearing parts of the transmission, and improve driving safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of gear shift control, and in particular to a transmission gear shift control method, device and vehicle. Background Art

[0002] With the development of passenger car technology, automatic transmissions have been widely used in the passenger car field. Automatic transmissions are easy to drive and have smooth gear shifting. They can automatically switch to the appropriate gear according to changes in the throttle and brake, greatly improving the vehicle's driving performance.

[0003] In the existing automatic transmission shift control system, the shift line is related to two factors: the throttle opening and the vehicle speed: at a fixed throttle opening, the higher the vehicle speed, the higher the corresponding gear position; at a fixed vehicle speed, the larger the throttle opening, the lower the gear position. For the control of the torque converter, each gear position can be individually set with a locking point and an unlocking point, which is also related to the vehicle speed and the throttle. As the vehicle speed and the throttle change, the torque converter will automatically perform locking and unlocking control.

[0004] Since vehicles with automatic transmissions are easy to operate and only require the driver to control the accelerator and brake, some drivers are more likely to engage in aggressive driving situations such as low-speed high-throttle acceleration and repeated high-throttle release while driving. During the frequent shifting of gears in these two working conditions, the torque converter and clutch generate a large amount of heat. The upper limit of the heat dissipation capacity of the existing vehicle thermal management system generally cannot cover the upper limit of the transmission's heat generation capacity, causing the oil temperature to rise rapidly and easily triggering the oil temperature alarm and torque limiting. If the transmission oil temperature is too high during driving, the reduced viscosity of the oil will cause the gear shifting quality to be much worse than the normal oil temperature. Long-term high oil temperature will increase the pressure on the cooling system, have a negative impact on the durability of the transmission's own components, and affect vehicle driving safety. Summary of the invention

[0005] The present invention provides a transmission shift control method, device and vehicle, which adjust the shift strategy in real time by identifying different working conditions, so as to comprehensively improve the transmission's own control ability over oil temperature and reduce the transmission's own heat generation.

[0006] In a first aspect, an embodiment of the present invention provides a transmission shift control method, comprising the following steps:

[0007] Obtaining oil temperature detection parameters and preset partition temperatures of the transmission;

[0008] Determine a transmission mode according to the oil temperature detection parameter and the preset partition temperature, the transmission mode at least including: a normal transmission mode, a first temperature rise mode, and a second temperature rise mode;

[0009] Acquire a gear shift-related parameter, wherein the gear shift-related parameter includes at least one of the following: real-time vehicle speed, real-time gear position, throttle opening, throttle opening change parameter, and torque converter flag;

[0010] Determine a target operating condition according to the shift-related parameters, the target operating condition at least comprising: a repeated high-throttle release operating condition and a low-speed high-throttle acceleration operating condition;

[0011] Determining a target shift strategy according to the shift-related parameters, the target operating condition and the transmission mode;

[0012] An upshift or downshift control is performed on the transmission according to the target shift strategy.

[0013] Optionally, when the target operating condition is the repeated high throttle release operating condition, the target shift strategy includes:

[0014] Determining whether to activate the emergency throttle release function according to the gear shift-related parameters;

[0015] After the emergency throttle release function is activated, determining a target gear holding time and a target gear shift list of the transmission after the throttle is released according to the transmission mode;

[0016] Shift control is performed on the transmission according to the target gear holding time and the target shift list.

[0017] Optionally, the throttle opening variation parameter includes a throttle closing rate;

[0018] The step of determining whether to activate the emergency throttle release function according to the gear shift associated parameter comprises:

[0019] Obtaining a time threshold of a change in throttle opening, wherein the time threshold is positively correlated with the oil temperature detection parameter;

[0020] Determining whether to start the throttle opening change timing according to the throttle opening and the throttle closing rate;

[0021] Determine whether the timing time of the throttle opening change reaches the time threshold;

[0022] Whether to activate the emergency throttle release function is determined based on the judgment result.

[0023] Optionally, when the emergency throttle release function is not activated, the method further includes:

[0024] Determining the downshift vehicle speed corresponding to the downshift line of the same throttle opening according to the transmission mode;

[0025] Among them, under the same throttle opening, the downshift vehicle speed in the first temperature rising mode is greater than the downshift vehicle speed in the conventional transmission mode, and the downshift vehicle speed in the second temperature rising mode is greater than the downshift vehicle speed in the first temperature rising mode.

[0026] Optionally, after determining the target gear holding time and the target gear shift list of the transmission after the accelerator is released according to the transmission mode, the method further includes:

[0027] Acquiring driving characteristic parameters of the driver;

[0028] determining a correction factor according to the driving characteristic parameter and the transmission mode;

[0029] Correcting the target gear holding time and the target gear shift list according to the correction coefficient;

[0030] Shift control is performed on the transmission based on the corrected target gear holding time and the target gear shift table.

[0031] Optionally, the target gear shift list includes: target gear positions, and target upshift vehicle speeds and target engine speeds corresponding to the target gear positions one by one;

[0032] Among them, the target gear holding time, the target upshift vehicle speed and the target engine speed are positively correlated with the driving characteristic parameters.

[0033] Optionally, when the target operating condition is the low-speed high-throttle acceleration operating condition, the target shift strategy includes:

[0034] determining a target lockup range of the torque converter according to the transmission mode;

[0035] Determining whether to start the locking strategy according to the throttle opening;

[0036] When the locking strategy is activated, unlocking / locking control is performed according to the target locking range.

[0037] Optionally, the target lockup range of the conventional transmission mode is smaller than the target lockup range of the first temperature increase mode;

[0038] The target locking range of the first heating mode is smaller than the target locking range of the second heating mode.

[0039] Optionally, also include:

[0040] determining the upshift vehicle speed in different throttle areas according to the throttle opening;

[0041] The upshift vehicle speed is positively correlated with the throttle opening.

[0042] 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 heating mode; the second preset partition temperature is a partition temperature between the first heating mode and the second heating mode;

[0043] The first preset partition temperature and the second preset partition temperature are negatively correlated with the oil temperature change rate of the oil temperature detection parameter.

[0044] In a second aspect, an embodiment of the present invention provides a transmission shift control device, which is used to execute the transmission shift control method according to the first aspect of the present invention, and the device includes:

[0045] A temperature detection module, used to obtain oil temperature detection parameters of the transmission;

[0046] A zone temperature setting module is used to obtain preset zone temperatures;

[0047] A transmission mode acquisition module, configured to determine a transmission mode according to the oil temperature detection parameter and the preset partition temperature, wherein the transmission mode includes at least: a normal transmission mode, a first temperature rise mode, and a second temperature rise mode;

[0048] An operating parameter acquisition module is used to acquire a gear shift-related parameter, wherein the gear shift-related parameter includes at least one of the following: a real-time vehicle speed, a real-time gear position, a throttle opening, a throttle opening change parameter, and a torque converter flag;

[0049] A working condition identification module, used for determining a target working condition according to the shift-related parameters, wherein the target working condition at least includes: a repeated high-throttle release working condition and a low-speed high-throttle acceleration working condition;

[0050] a gear shift strategy acquisition module, configured to determine a target gear shift strategy according to the gear shift associated parameters, the target operating condition and the transmission mode;

[0051] The gear shift execution module is used to execute upshift or downshift control on the transmission according to the target gear shift strategy.

[0052] In a third aspect, an embodiment of the present invention provides a vehicle, comprising: the transmission shift control device described in the second aspect of the present invention, wherein the transmission shift control device is used to execute the transmission shift control method described in the first aspect of the present invention.

[0053] The technical solution of the embodiment of the present invention implements a transmission shift control method, which obtains the oil temperature detection parameters and preset partition temperature of the transmission, and determines the real-time transmission mode of the vehicle according to the oil temperature detection parameters and the preset partition temperature; obtains the shift-related parameters of the transmission, and determines the real-time target working condition of the vehicle in combination with the shift-related parameters, and the target working condition at least includes: repeated large throttle release working condition and low-speed large throttle acceleration working condition; determines the target shift strategy according to the shift-related parameters, the target working condition and the transmission mode; and performs upshift or downshift control on the transmission according to the target shift strategy. By identifying the vehicle working condition and the transmission mode, implementing different levels of shift strategies, and reducing the heat generated by the transmission itself, the increase of the transmission oil temperature can be effectively limited, the shift quality of the transmission can be improved, the risk of damage to the internal wearing parts of the transmission can be reduced, and the driving safety performance can be improved.

[0054] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0056] Figure 1 A flow chart of a transmission shift control method provided by an embodiment of the present invention;

[0057] Figure 2 A flow chart of another transmission shift control method provided by an embodiment of the present invention;

[0058] Figure 3 A flow chart of another transmission shift control method provided by an embodiment of the present invention;

[0059] Figure 4 A flow chart of a transmission shift control method provided by an embodiment of the present invention;

[0060] Figure 5 A flow chart of another transmission shift control method provided by an embodiment of the present invention;

[0061] Figure 6 A schematic structural diagram of a transmission shift control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0062] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0063] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0064] Figure 1 A flow chart of a transmission shift control method provided in an embodiment of the present invention is applicable to the case where oil temperature is controlled based on a shift strategy. The method can be executed by an automatic transmission control unit (Transmission-Control-Unit, TCU for short).

[0065] like Figure 1 As shown, the method comprises the following steps:

[0066] S110, obtaining transmission oil temperature detection parameters and preset partition temperatures.

[0067] The oil temperature detection parameter of the transmission may be a parameter such as the real-time oil temperature of the coolant measured by a temperature sensor. The preset zone temperature of the transmission refers to a parameter for classifying the oil temperature of the transmission.

[0068] In some embodiments, the preset partition temperature may be a determined temperature value or a temperature range. The preset partition temperature may be calibrated and preset in advance, and its specific value is not limited.

[0069] S120. Determine a transmission mode according to an oil temperature detection parameter and a preset partition temperature, wherein the transmission mode includes at least: a normal transmission mode, a first temperature rise mode, and a second temperature rise mode.

[0070] Among them, the oil temperature in the conventional transmission mode is lower than the oil temperature in the first temperature rising mode, and the oil temperature in the first temperature rising mode is lower than the oil temperature in the second temperature rising mode.

[0071] In some embodiments, the preset partition temperature can be set as a boundary temperature value. For example, the preset partition temperature may include 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 heating 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 less than the value of the second preset partition temperature. When the oil temperature detection parameter is less than the first preset partition temperature, the current transmission mode is determined as the conventional transmission mode; when the oil temperature detection parameter is greater than or equal to the first preset partition temperature, and less than or equal to the second preset partition temperature, the current transmission mode is determined as the first heating mode; when the oil temperature detection parameter is greater than or equal to the second preset partition temperature, the current transmission mode is determined as the second heating mode.

[0072] In the present invention, the first preset partition temperature and the second preset partition temperature are negatively correlated with the oil temperature change rate of the oil temperature detection parameter. Specifically, the oil temperature change rate can be calculated based on the detected oil temperature detection parameter, and the first preset partition temperature and the second preset partition temperature can be dynamically corrected based on the oil temperature change rate, which can avoid the delay of the target control strategy and thus affect the control effect of the oil temperature.

[0073] In other embodiments, the preset partition temperature may be set as a temperature interval, and one temperature interval corresponds to one transmission mode. For example, the preset partition temperature may include a first temperature interval, a second temperature interval, and a third temperature interval. Any temperature value in the first temperature interval is less than any temperature value in the second temperature interval, and any temperature value in the second temperature interval is less than any temperature value in 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 a conventional transmission mode. When the acquired transmission oil temperature detection parameter is in the second temperature interval, the current transmission mode is determined as a first heating mode. When the acquired transmission oil temperature detection parameter is in the third temperature interval, the current transmission mode is determined as a second heating mode.

[0074] S130, obtaining shift-related parameters, where the shift-related parameters include at least one of the following: real-time vehicle speed, real-time gear position, throttle opening, throttle opening variation parameter, and torque converter flag.

[0075] Among them, the real-time vehicle speed can be obtained according to the wheel speed of the current vehicle, and the wheel speed can be obtained by placing sensors on the wheels. The throttle opening can be directly obtained from the CAN line, and the throttle opening change parameter can be the ratio of the throttle opening to time, which can be obtained by internal calculation and processing of the TCU. The real-time gear is the driving gear of the current vehicle, and the real-time gear and torque converter flag can be obtained from the TCU. The torque converter is set at the front end of the automatic transmission. On the one hand, it transmits speed and torque, and on the other hand, it makes the connection between the engine and the transmission non-rigid. When the target vehicle is driving at a low speed, the torque converter is open; when the target vehicle is driving at a high speed, the torque converter is closed. The torque converter flag can be used to characterize 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 a high-speed driving state; if the torque converter flag is set to 0, that is, the torque converter is open, it can be determined that the current target vehicle is in a low-speed driving state.

[0076] S140. Determine a target operating condition according to the gear shift-related parameters, where the target operating condition at least includes: a repeated high-throttle release operating condition and a low-speed high-throttle acceleration operating condition.

[0077] Among them, the repeated high-throttle release condition refers to the condition in which the target vehicle repeatedly accelerates with high throttle to trigger power downshift during driving. Under this condition, the vehicle's throttle opening and throttle opening change parameters are large, and parameters such as real-time vehicle speed and real-time gear position are also large. The low-speed high-throttle acceleration condition refers to the condition in which the target vehicle's real-time vehicle speed and real-time gear position are low, but parameters such as throttle opening and throttle opening change parameters are large.

[0078] In this step, calibration parameters of the throttle opening, vehicle speed, gear position and torque converter mark under repeated high-throttle release conditions and low-speed high-throttle acceleration conditions can be established through calibration, and the gear shift-related parameters of the current target vehicle are compared with the calibration parameters, and the conditions with consistent parameters are determined as the target conditions.

[0079] S150, determining a target shifting strategy according to the shifting-related parameters, the target operating condition and the transmission mode.

[0080] Among them, the target shift strategy includes the downshift shift strategy in the conventional transmission mode, the first warm-up mode and the second warm-up mode under the repeated high-throttle release working condition, and the upshift shift strategy in the conventional transmission mode, the first warm-up mode and the second warm-up mode under the low-speed high-throttle acceleration working condition. Under different target working conditions and different transmission modes, the engine speed and shift vehicle speed, gear holding time, and torque converter locking strategy of the shift list (i.e., the shift MAP under different vehicle speeds and throttle openings) in the target shift strategy can be established through calibration, and there is no restriction on their specific values.

[0081] In this step, after the target operating condition and transmission mode are identified, the gear shifting related parameters of the target vehicle driving process can be continuously monitored. Typically, the gear shifting related parameters include the throttle opening and the throttle opening change rate, and whether to activate the corresponding target gear shifting strategy is determined based on the monitoring.

[0082] S160: Execute upshift or downshift control on the transmission according to the target shift strategy.

[0083] Specifically, under low-speed, high-throttle acceleration conditions, the transmission is controlled to upshift, and as the oil temperature changes, the vehicle speed point corresponding to upshifting with the same throttle opening is adjusted to reduce the probability of upshifting during high-throttle acceleration. Under repeated high-throttle release conditions, the downshift strategy is combined with the fast off function to adjust the vehicle speed point corresponding to downshifting with the same throttle opening as the oil temperature changes to reduce the probability of downshifting when the driver steps on the accelerator again.

[0084] The technical solution of the embodiment of the present invention can effectively limit the increase of transmission oil temperature, improve the shifting quality of the transmission, reduce the risk of damage to the internal wearing parts of the transmission, and improve driving safety performance by identifying the vehicle operating conditions and transmission modes and implementing different levels of shifting strategies to reduce the heat generated by the transmission itself.

[0085] Figure 2 A flowchart of another transmission shift control method provided by an embodiment of the present invention, Figure 2 In the embodiment of the present invention, a specific implementation method of a shift strategy under repeated high throttle release conditions is shown by way of example.

[0086] like Figure 2 As shown, when the target operating condition is a repeated throttle release operating condition, the transmission shift control method includes the following steps:

[0087] S210: Obtain transmission oil temperature detection parameters and preset zone temperatures.

[0088] S220: Determine a transmission mode according to an oil temperature detection parameter and a preset partition temperature.

[0089] S230: Obtain gear shift related parameters.

[0090] S240: Determine a target operating condition according to the gear shift-related parameters.

[0091] S250: Determine a target shift strategy according to the shift-related parameters, the target operating condition, and the transmission mode.

[0092] In this embodiment, when the target operating condition is a repeated high throttle release condition, step S260 is executed.

[0093] S260: Determine whether to activate the emergency accelerator release function according to the gear shift-related parameters.

[0094] The fast off function refers to a strategy to optimize the upshift parameters when the accelerator is released quickly, maintaining the current gear for a period of time before upshifting, and improving driving performance by shielding unnecessary gear shifts. Typically, the upshift parameters of the fast off function include but are not limited to: gear holding time, engine speed, and upshift test.

[0095] In this embodiment, the parameters of the emergency throttle release function may be modified according to the oil temperature detection parameters and the transmission mode.

[0096] S270: After the emergency accelerator release function is activated, determine a target gear holding time and a target gear shift list of the transmission after the accelerator is released according to the transmission mode.

[0097] After the sudden release of the accelerator function is activated, when the transmission mode enters the first warm-up mode and then enters the second warm-up mode from the normal transmission mode, the holding time of the target gear after the sudden release of the accelerator can be extended. The specific extension time can be preset in advance, and then the target gear shift list is determined to increase the corresponding engine speed after upshifting, thereby reducing the probability or number of downshifts when the accelerator is pressed again.

[0098] S280: Execute shift control on the transmission according to the target gear holding time and the target gear shift list.

[0099] The transmission is further subjected to corresponding upshift or downshift operations according to the determined target gear holding time and the target gear shift list, so as to reduce the heat generated by the transmission caused by the power downshift.

[0100] S290: Execute upshift or downshift control on the transmission according to the target shift strategy.

[0101] Specifically, under the condition of repeated large throttle release, the current transmission mode is identified according to the oil temperature detection parameters and the preset partition temperature. For example, the transmission mode can be any one of the conventional transmission mode, the first warming mode or the second warming mode. The preset gear holding time is determined in combination with the current transmission mode. After the quick throttle release function is activated, the transmission keeps the gear before the throttle is released. The preset gear holding time remains unchanged, and then the upshift operation is performed according to the shift list in the target shift strategy (i.e., the shift MAP under different vehicle speeds and throttle openings) to control the engine speed within a certain range. Among them, the transmission mode corresponding to the high oil temperature keeps the previous gear for a longer time. If the driver does not step on the throttle again, when the target vehicle coasts and decelerates to the coasting downshift point of the current transmission mode, the quick throttle release function automatically exits. If the driver steps on the throttle again during the gear control, it is necessary to exit the target shift strategy after a certain delay, and perform a new upshift or downshift control on the transmission according to the target shift strategy of the current transmission mode.

[0102] Optionally, the throttle opening variation parameter includes a throttle closing rate. The throttle closing rate indicates how fast the target vehicle decelerates, and the target operating condition can be better determined based on this parameter.

[0103] Figure 3 A flow chart of another transmission shift control method provided in an embodiment of the present invention exemplarily shows a specific implementation method of determining whether to activate the emergency release throttle function.

[0104] like Figure 3 As shown, the above step S260 specifically includes the following steps:

[0105] S261, obtaining a time threshold T1 of the throttle opening change, where the time threshold T1 is positively correlated with an oil temperature detection parameter.

[0106] When the throttle opening is within a certain interval and the closing rate of the throttle opening is within a certain interval, the upshift command is temporarily shielded. The duration when the throttle opening is reduced to below a given value is the throttle opening change time, and the throttle opening change time threshold can be obtained in advance. As the detected oil temperature parameter continues to increase, the corresponding throttle opening change time threshold will also increase accordingly, and the two are positively correlated.

[0107] S262: Determine whether to start the throttle opening change timing according to the throttle opening and the throttle closing rate.

[0108] If the throttle opening is greater than the first opening threshold a and the closing rate of the throttle opening is greater than the rate threshold b, the upshift command is temporarily shielded and the throttle opening change timing is started.

[0109] S263: Determine whether the timing time of the throttle opening change reaches the time threshold T1.

[0110] S264: Determine whether to activate the emergency throttle release function according to the judgment result.

[0111] If the throttle opening decreases to below the second opening threshold c within the time threshold T1, the emergency throttle release function is activated; if the throttle opening does not decrease to below the second opening threshold c within the time threshold T1, the emergency throttle release function is not activated, and the function of shielding upshifting is cancelled.

[0112] It should be noted that the first opening threshold a, the speed threshold b, the second opening threshold c and the time threshold T1 can be set by those skilled in the art according to the driving performance and working conditions of the target vehicle, and their specific values ​​are not limited.

[0113] Optionally, when the emergency release throttle function is not activated, the transmission shift control method further includes: determining the downshift vehicle speed corresponding to the downshift line with the same throttle opening according to the transmission mode.

[0114] Among them, under the same throttle opening, the downshift vehicle speed in the first temperature rising mode is greater than the downshift vehicle speed in the conventional transmission mode, and the downshift vehicle speed in the second temperature rising mode is greater than the downshift vehicle speed in the first temperature rising mode.

[0115] Specifically, when the sudden release of the accelerator function is not activated, at the same throttle opening, the downshift speed in the first warm-up mode is greater than the downshift speed in the conventional transmission mode, and the downshift speed in the second warm-up mode is greater than the downshift speed in the first warm-up mode, thereby reducing the probability of downshifting when the driver steps on the accelerator again, reducing heat generation, and effectively controlling the heating rate.

[0116] Figure 4 A flow chart of a transmission shift control method provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, after determining the target gear holding time and the target gear shift list of the transmission after the accelerator is released according to the transmission mode, the transmission shift control method further includes:

[0117] S308: Acquire the driving characteristic parameters of the driver.

[0118] The driving characteristic parameter may be a characteristic parameter that characterizes the intensity of the driver's release of the accelerator. The driving characteristic parameter of the driver may 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. It is stipulated that within a time interval, each time the emergency release function is activated, the counter is incremented by 1, and if the emergency release function is not activated, the counter is decremented by 1. The higher the accumulated counter value, the more intense the driver's current driving level is.

[0119] S309: Determine a correction coefficient according to the driving characteristic parameters and the transmission mode.

[0120] Different transmission modes and different driving characteristic parameters have different corresponding correction coefficients. Each transmission mode sets a separate correction coefficient, which is multiplied by the target gear holding time after the accelerator is released and a specific target gear shift list to obtain the corrected target gear holding time and gear shifting speed.

[0121] S310: Correct the target gear holding time and the target gear shift list according to the correction coefficient.

[0122] The longer the target gear holding time corresponding to the correction coefficient is, the higher the upshift vehicle speed and engine speed after upshift corresponding to each gear in the corrected target shift list will be. The driving characteristic parameters can minimize the number of gear shifts, control the rate of increase in transmission oil temperature, minimize the negative impact of intense driving on the vehicle and transmission, and meet the power needs of users in intense driving.

[0123] S311 . Execute shift control on the transmission based on the corrected target gear holding time and the target gear shift list.

[0124] Optionally, the target gear shift list includes: a target gear, and a target upshift vehicle speed and a target engine speed corresponding to the target gear; wherein the target gear holding time, the target upshift vehicle speed and the target engine speed are positively correlated with the driving characteristic parameters.

[0125] The target gear is the gear that the transmission needs to shift to under the current working condition and transmission mode. When performing a gear shift, the corresponding upshift vehicle speed and engine speed must be reached to reach the target gear. The higher the accumulated counter value in the driving characteristic parameter, the higher the target gear holding time, target upshift vehicle speed and target engine speed will be, and vice versa.

[0126] Figure 5 A flowchart of another transmission shift control method provided in an embodiment of the present invention is applicable to a target operating condition of a low-speed high-throttle acceleration condition.

[0127] like Figure 5 As shown in FIG. 1 , when the target operating condition is a low-speed high-throttle acceleration condition, the target shift strategy includes:

[0128] S450. Determine a target locking range of the torque converter according to the transmission mode.

[0129] Among them, the target locking ranges of the torque converter corresponding to the conventional transmission mode, the first heating mode and the second heating mode are different. For example, in the conventional transmission mode, the target locking range of the torque converter is 3 gears, and the 1st and 2nd gears are unlocked, which can improve the power and comfort of starting from the spot acceleration; in the first heating mode, when the throttle opening is greater than a certain value and the vehicle speed is lower than a certain value, the target locking range of the torque converter is 2 gears, and when the throttle opening is lower than the above value, it is still locked at the 3rd gear. The torque is relatively low at a low throttle opening, and the heat is less. The locking at the 3rd gear is still to ensure the power and comfort of starting at a low speed; in the second heating mode, similar to the first heating mode, the 1st gear is set to start locking in the low speed and large throttle area, and the 3rd gear is still locked in the small throttle area.

[0130] S460: Determine whether to start the locking strategy according to the throttle opening.

[0131] Exemplarily, when the throttle opening is greater than a preset opening threshold (e.g., 50%), and the vehicle speed is lower than a preset vehicle speed threshold (e.g., 20 km / h), it is determined that the target vehicle has entered a low-speed high-throttle acceleration condition, and the locking strategy is activated. When the throttle opening is lower than a preset opening threshold (e.g., 50%), or the vehicle speed is greater than a preset vehicle speed threshold (e.g., 20 km / h), it is determined that the target vehicle has not entered a low-speed high-throttle acceleration condition, and the locking strategy is not activated.

[0132] S470: When the locking strategy is started, unlocking / locking control is performed according to the target locking range.

[0133] When the locking strategy is started, the target locking range of the torque converter is determined according to the transmission mode and the corresponding unlocking / locking operation is performed on the device.

[0134] Optionally, the target locking range of the conventional transmission mode is smaller than the target locking range of the first heating mode; and the target locking range of the first heating mode is smaller than the target locking range of the second heating mode.

[0135] For example, the target lockup range of the normal transmission mode is gear 3, the target lockup range of the first warming-up mode is gear 2, and the target lockup range of the second warming-up mode is gear 3. By setting the target lockup ranges of the normal transmission mode, the first warming-up mode, and the second warming-up mode, the power and comfort of stationary start acceleration and low-speed start can be improved.

[0136] Optionally, the transmission shift control method provided by the embodiment of the present invention further includes: determining the upshift vehicle speed in different throttle areas according to the throttle opening; wherein the upshift vehicle speed is positively correlated with the throttle opening.

[0137] The throttle area refers to the throttle opening being in a certain numerical range. Different numerical ranges correspond to different throttle areas, and the upshift speeds in different throttle areas are also different. The larger the throttle opening, the higher the upshift speed, and vice versa.

[0138] Based on the same inventive concept, the present invention also provides a transmission shift control device, which can execute the transmission shift control method provided in the above embodiment and has corresponding functional modules and beneficial effects of the execution method.

[0139] Figure 6 A schematic structural diagram of a transmission shift control device provided in an embodiment of the present invention.

[0140] like Figure 6 As shown, the transmission shift control device includes:

[0141] The temperature detection module 11 is used to obtain the oil temperature detection parameters of the transmission.

[0142] The partition temperature setting module 12 is used to obtain the preset partition temperature.

[0143] The transmission mode acquisition module 13 is used to determine the transmission mode according to the oil temperature detection parameter and the preset partition temperature. The transmission mode at least includes: a normal transmission mode, a first temperature rise mode and a second temperature rise mode.

[0144] The operating parameter acquisition module 14 is used to acquire the gear shift-related parameters, which include at least one of the following: real-time vehicle speed, real-time gear position, throttle opening, throttle opening change parameter and torque converter flag.

[0145] The operating condition identification module 15 is used to determine the target operating condition according to the gear shift associated parameters, and the target operating condition at least includes: a repeated high throttle release operating condition and a low speed high throttle acceleration operating condition.

[0146] The gear shift strategy acquisition module 16 is used to determine a target gear shift strategy according to gear shift associated parameters, target operating conditions and transmission mode.

[0147] The gear shift execution module 17 is used to execute upshift or downshift control on the transmission according to the target gear shift strategy.

[0148] Specifically, under low-speed, high-throttle acceleration conditions, the transmission is controlled to upshift, and as the oil temperature changes, the vehicle speed point corresponding to upshifting with the same throttle opening is adjusted to reduce the probability of upshifting during high-throttle acceleration. Under repeated high-throttle release conditions, the downshift strategy is combined with the fast off function to adjust the vehicle speed point corresponding to downshifting with the same throttle opening as the oil temperature changes to reduce the probability of downshifting when the driver steps on the accelerator again.

[0149] In some embodiments, when the target operating condition is a repeated high throttle release condition, the target gear shifting strategy includes: determining whether to activate the quick throttle release function based on gear shift-related parameters; after the quick throttle release function is activated, determining the target gear holding time and target gear shifting list of the transmission after the throttle is released based on the transmission mode; and performing gear shifting control on the transmission based on the target gear holding time and target gear shifting list.

[0150] In some embodiments, the throttle opening change parameter includes the throttle closing rate; determining whether to activate the emergency throttle release function according to the gear shift associated parameter includes: obtaining a time threshold of the throttle opening change, the time threshold is positively correlated with the oil temperature detection parameter; determining whether to start the throttle opening change timing according to the throttle opening and the throttle closing rate; judging whether the timing time of the throttle opening change reaches the time threshold;

[0151] Whether to activate the emergency throttle release function is determined based on the judgment result.

[0152] In some embodiments, when the emergency release throttle function is not activated, the method further includes: determining the downshift vehicle speed corresponding to the downshift line with the same throttle opening according to the transmission mode; wherein, under the same throttle opening, the downshift vehicle speed in the first heating mode is greater than the downshift vehicle speed in the conventional transmission mode, and the downshift vehicle speed in the second heating mode is greater than the downshift vehicle speed in the first heating mode.

[0153] In some embodiments, after determining the target gear holding time and target gear shift list of the transmission after releasing the accelerator according to the transmission mode, the method also includes: obtaining the driving characteristic parameters of the driver; determining a correction coefficient according to the driving characteristic parameters and the transmission mode; correcting the target gear holding time and the target gear shift list according to the correction coefficient; and performing gear shift control on the transmission based on the corrected target gear holding time and target gear shift list.

[0154] In some embodiments, the target gear shift list includes: a target gear, and a target upshift vehicle speed and a target engine speed corresponding to the target gear; wherein the target gear holding time, the target upshift vehicle speed and the target engine speed are positively correlated with the driving characteristic parameters.

[0155] In some embodiments, when the target operating condition is a low-speed, high-throttle acceleration condition, the target shifting strategy includes: determining a target locking range of the torque converter according to the transmission mode; determining whether to start the locking strategy according to the throttle opening; and when the locking strategy is started, performing unlocking / locking control according to the target locking range.

[0156] In some embodiments, the target lockup range of the normal transmission mode is smaller than the target lockup range of the first warming-up mode; and the target lockup range of the first warming-up mode is smaller than the target lockup range of the second warming-up mode.

[0157] In some embodiments, the shift control method further includes: determining the upshift vehicle speed in different throttle areas according to the throttle opening; wherein the upshift vehicle speed is positively correlated with the throttle opening.

[0158] In some embodiments, the preset partition temperature includes a first preset partition temperature and a second preset partition temperature, wherein the first preset partition temperature is the partition temperature between the conventional transmission mode and the first heating mode; the second preset partition temperature is the partition temperature between the first heating mode and the second heating mode; the first preset partition temperature and the second preset partition temperature are negatively correlated with the oil temperature change rate of the oil temperature detection parameter.

[0159] Based on the same concept, an embodiment of the present invention further provides a vehicle, comprising: a transmission shift control device provided by the above embodiment of the present invention, the transmission shift control device is used 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 embodiment, which will not be repeated here.

[0160] Exemplarily, the vehicle may be an automatic car or the like.

[0161] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0162] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A transmission shift control method, characterized in that: The following steps are involved: Obtaining oil temperature detection parameters and preset partition temperatures of the transmission; Determine a transmission mode according to the oil temperature detection parameter and the preset partition temperature, the transmission mode at least including: a normal transmission mode, a first temperature rise mode, and a second temperature rise mode; Acquire a gear shift-related parameter, wherein the gear shift-related parameter includes at least one of the following: real-time vehicle speed, real-time gear position, throttle opening, throttle opening change parameter, and torque converter flag; Determine a target operating condition according to the shift-related parameters, the target operating condition at least comprising: a repeated high-throttle release operating condition and a low-speed high-throttle acceleration operating condition; Determining a target shift strategy according to the shift-related parameters, the target operating condition and the transmission mode; performing upshift or downshift control on the transmission according to the target shift strategy; Wherein, when the target operating condition is the repeated high throttle release operating condition, the target shifting strategy includes: Determining whether to activate the emergency throttle release function according to the gear shift-related parameters; After the emergency throttle release function is activated, determining a target gear holding time and a target gear shift list of the transmission after the throttle is released according to the transmission mode; Shift control is performed on the transmission according to the target gear holding time and the target shift list.

2. The method according to claim 1, characterized in that The throttle opening variation parameter includes the throttle closing rate; The step of determining whether to activate the emergency throttle release function according to the gear shift associated parameter comprises: Obtaining a time threshold of a change in throttle opening, wherein the time threshold is positively correlated with the oil temperature detection parameter; Determining whether to start the throttle opening change timing according to the throttle opening and the throttle closing rate; Determine whether the timing time of the throttle opening change reaches the time threshold; Whether to activate the emergency throttle release function is determined based on the judgment result.

3. The method according to claim 1, characterized in that When the emergency release throttle function is not activated, the method further includes: Determining the downshift vehicle speed corresponding to the downshift line of the same throttle opening according to the transmission mode; Among them, under the same throttle opening, the downshift vehicle speed in the first temperature rising mode is greater than the downshift vehicle speed in the conventional transmission mode, and the downshift vehicle speed in the second temperature rising mode is greater than the downshift vehicle speed in the first temperature rising mode.

4. The method according to claim 1, characterized in that: After determining the target gear holding time and the target gear shift list of the transmission after the accelerator pedal is released according to the transmission mode, the method further includes: Acquiring driving characteristic parameters of the 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 shift list according to the correction coefficient; Shift control is performed on the transmission based on the corrected target gear holding time and the target gear shift table.

5. The method according to claim 4, characterized in that The target shift list includes: a target gear position, and a target upshift vehicle speed and a target engine speed corresponding to the target gear position; Among them, the target gear holding time, the target upshift vehicle speed and the target engine speed are positively correlated with the driving characteristic parameters.

6. The method according to claim 1, characterized in that When the target operating condition is the low-speed high-throttle acceleration operating condition, the target shift strategy includes: determining a target lockup range of the torque converter according to the transmission mode; Determining whether to start the locking strategy according to the throttle opening; When the locking strategy is activated, unlocking / locking control is performed according to the target locking range.

7. The method according to claim 6, characterized in that The target lockup range of the normal transmission mode is smaller than the target lockup range of the first warming mode; The target locking range of the first heating mode is smaller than the target locking range of the second heating mode.

8. The method according to claim 6, characterized in that Also includes: determining the upshift vehicle speed in different throttle areas according to the throttle opening; The upshift vehicle speed is positively correlated with the throttle opening.

9. The method according to any one of claims 1 to 8, characterized in that 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 normal transmission mode and the first heating mode; the second preset partition temperature is a partition temperature between the first heating mode and the second heating mode; The first preset partition temperature and the second preset partition temperature are negatively correlated with the oil temperature change rate of the oil temperature detection parameter.

10. A transmission shift control device, characterized in that: The device for executing the transmission shift control method according to any one of claims 1 to 9 comprises: A temperature detection module, used to obtain oil temperature detection parameters of the transmission; A zone temperature setting module is used to obtain preset zone temperatures; A transmission mode acquisition module, configured to determine a transmission mode according to the oil temperature detection parameter and the preset partition temperature, wherein the transmission mode includes at least: a normal transmission mode, a first temperature rise mode, and a second temperature rise mode; An operating parameter acquisition module is used to acquire a gear shift-related parameter, wherein the gear shift-related parameter includes at least one of the following: a real-time vehicle speed, a real-time gear position, a throttle opening, a throttle opening change parameter, and a torque converter flag; A working condition identification module, used for determining a target working condition according to the shift-related parameters, wherein the target working condition at least includes: a repeated high-throttle release working condition and a low-speed high-throttle acceleration working condition; a gear shift strategy acquisition module, configured to determine a target gear shift strategy according to the gear shift associated parameters, the target operating condition and the transmission mode; when the target operating condition is the repeated high throttle release operating condition, the target gear shift strategy includes: determining whether to activate the emergency throttle release function according to the gear shift associated parameters; after the emergency throttle release function is activated, determining a target gear holding time and a target gear shift list of the transmission after the throttle is released according to the transmission mode; and performing gear shift control on the transmission according to the target gear holding time and the target gear shift list; The gear shift execution module is used to execute upshift or downshift control on the transmission according to the target gear shift strategy.

11. A vehicle, characterized in that: include: The transmission shift control device according to claim 10 is used to execute the transmission shift control method according to any one of claims 1-9.

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