Hydraulic torque converter state switching control method, device, vehicle and storage medium

Abstract

The present invention discloses a method, device, vehicle and storage medium for controlling the state switching of a torque converter. The method includes obtaining a target instruction when the torque converter of the vehicle is in a locked state, wherein the target instruction triggers a change in the torque transmission direction of the vehicle's transmission system; obtaining a state parameter, and judging whether the current vehicle is in a target working condition according to the state parameter; if the current vehicle is in the target working condition, the torque converter is switched to an open state, and after maintaining the open state for a preset time, the torque converter is switched back to a locked state. The present invention accurately identifies the target working condition, controls the torque converter to open quickly and briefly under the target working condition, absorbs the shock caused by the collision of the transmission components when the torque transmission direction of the transmission system is switched, reduces vehicle vibration, and reduces oil consumption by controlling the torque converter to close again after being briefly opened, thereby smoothing the user's driving experience while ensuring fuel economy.

Description

Technical Field

[0001] The present specification relates to the field of torque converters, and in particular to a method, device, vehicle and storage medium for controlling state switching of a torque converter. Background Art

[0002] For vehicles equipped with a torque converter, the locking function of the torque converter can be used to improve the transmission efficiency of the vehicle, and since the engine can be in a fuel-cut state in the locked state, fuel consumption can be reduced. Therefore, vehicle designers often make more use of the locking function of the torque converter in feasible scenarios, so that the torque converter can be in a locked state in more and more scenarios.

[0003] However, when the torque converter is in the locked state, the output shaft of the transmitter and the input shaft of the gearbox are mechanically linked. In this case, the change in the transmission direction of the vehicle transmission system can cause the transmission components in the transmission system to vibrate, reducing the smoothness of the vehicle's operation. Summary of the invention

[0004] In view of the problem in the prior art that, when the torque converter is locked, due to the inherent clearance of the transmission mechanism in the transmission system and the fact that the transmission system is in a hard-connected state, the transmission components collide when the output torque direction of the transmission system is switched, thereby causing the whole vehicle to oscillate, this specification provides a torque converter state switching control method, device, vehicle and storage medium.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted in this specification is:

[0006] In one aspect, the present specification provides a method for controlling a state switching of a torque converter, the method comprising:

[0007] When the torque converter of the vehicle is in a locked state, obtaining a target instruction, wherein the target instruction triggers a change in the torque transmission direction of the transmission system of the vehicle;

[0008] Acquiring state parameters, and determining whether the current vehicle is in a target operating condition according to the state parameters;

[0009] If the current vehicle is in the target operating condition, the torque converter is switched to an open state, and after being kept in the open state for a preset time, the torque converter is switched back to a locked state.

[0010] On the other hand, the present specification provides a torque converter state switching control device, the device comprising:

[0011] A target instruction acquisition module, used to acquire a target instruction when the torque converter of the vehicle is in a locked state, wherein the target instruction triggers a change in the torque transmission direction of the vehicle's transmission system;

[0012] A target operating condition determination module is used to obtain state parameters and determine whether the current vehicle is in the target operating condition according to the state parameters;

[0013] The state switching module is used to switch the hydraulic torque converter to an open state if the current vehicle is in a target operating condition, and after maintaining the hydraulic torque converter in the open state for a preset time, switch the hydraulic torque converter back to a locked state.

[0014] On the other hand, the present specification provides a vehicle, which includes the above-mentioned torque converter state switching control device.

[0015] On the other hand, the present specification provides a computer storage medium, in which at least one instruction or at least one program is stored, and the at least one instruction or at least one program is loaded and executed by a processor to implement a torque converter state switching control method.

[0016] The beneficial effects brought by the technical solution of this specification are:

[0017] This manual accurately identifies the target operating condition and controls the torque converter to open quickly and briefly under the target operating condition, thereby absorbing the shock caused by the impact of the transmission components when the torque transmission direction of the transmission system is switched, reducing vehicle vibration, and reducing fuel consumption by controlling the torque converter to open briefly and then close again, thereby achieving vehicle shock absorption while taking into account vehicle fuel consumption, smoothing the user's driving experience while ensuring fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions and advantages of the embodiments or prior arts in this specification, the drawings required for use in the embodiments or prior art descriptions are briefly introduced below. 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.

[0019] Figure 1 It is a schematic diagram of the transmission system of a vehicle equipped with a torque converter when the torque converter is in a locked state provided in an embodiment of this specification.

[0020] Figure 2 It is a schematic diagram of changes in vehicle-related parameters in a scenario where the accelerator is pressed while the vehicle is coasting in the prior art, when the torque converter provided in the embodiments of this specification is in a locked state.

[0021] Figure 3 It is a flow chart of a method for controlling the state switching of a torque converter provided in an embodiment of this specification.

[0022] Figure 4 It is a flowchart of obtaining state parameters provided in the embodiments of this specification and determining whether the current vehicle is in a target operating condition based on the state parameters.

[0023] Figure 5 It is a schematic diagram of target operating condition judgment provided in the embodiments of this specification.

[0024] Figure 6 It is a flow chart of switching the torque converter back to the locked state after maintaining the open state for a preset time provided in the embodiment of this specification.

[0025] Figure 7 It is a schematic diagram of changes in vehicle-related parameters in a scenario where the vehicle is gliding and the accelerator is pressed in an embodiment of this specification in a locked state provided in an embodiment of this specification.

[0026] Figure 8 It is a schematic diagram of a torque converter state switching control device provided in an embodiment of this specification.

[0027] Fig. 9 It is a schematic diagram of a target operating condition determination module provided in the embodiments of this specification. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions 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 are within the scope of protection of the present invention.

[0029] 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 interchangeable 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 server 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. In order to facilitate a full explanation of the technical solutions in the embodiments in this specification, the embodiments in this specification first provide a unified explanation of the relevant technical terms:

[0030] AT automatic transmission: AT (automatic transmission) stands for hydraulic automatic transmission. It consists of a hydraulic torque converter, planetary gear transmission, control mechanism, etc.

[0031] CVT continuously variable transmission: The speed ratio of CVT (Continuously Variable Transmission) is not a discontinuous point, but a series of continuous values, thus achieving good economy, power and driving smoothness. Some CVT continuously variable transmissions can also be equipped with a torque converter.

[0032] Please refer to Figure 1 , which shows a schematic diagram of the transmission system of a vehicle equipped with a hydraulic torque converter when the hydraulic torque converter is in a locked state. Figure 1 As shown, the output shaft 1 of the vehicle's engine is connected to the torque converter, the torque converter is connected to the input shaft 2 of the gearbox, and the gearbox output shaft 3 drives the tire to move through the drive shaft. When the torque converter is in a locked state, the engine's output shaft 1 and the gearbox's input shaft 2 are mechanically linked, and the torque transmission direction is different when the vehicle is in different states.

[0033] When the vehicle is in driving state (acceleration state), the engine outputs torque. Figure 1 The direction of torque transmission is engine-torque converter-transmission-drive shaft-tire, that is, the transmission system is in positive meshing.

[0034] When the vehicle is in a driven state (deceleration state), the vehicle moves by the inertia of the whole vehicle. Figure 1 The direction of torque transmission is tire-drive shaft-gearbox-torque converter-engine, that is, the transmission system is in reverse meshing.

[0035] Obviously, the torque transmission direction of the transmission system in the driving state and the driven state is different. When the vehicle is switched from the driving state to the driven state, or from the driven state to the driving state, the torque transmission direction in the transmission system will change. When the torque converter is in the locked state, the output shaft of the engine and the input shaft of the gearbox are mechanically linked, and there are inherent transmission gaps in other transmission mechanisms in the transmission system, such as the transmission gap between the driving wheel and the driven wheel of the planetary gear, the transmission gap between the counter gear, the transmission gap between the main reduction gear, and the transmission gap between the transmission shaft and the tire, etc. This causes the change in the torque transmission direction of the transmission system, which in turn causes collisions between the various transmission components in the transmission system, thereby causing vehicle vibration.

[0036] Please refer to Figure 2, which shows a schematic diagram of the changes in vehicle-related parameters in the scene of stepping on the accelerator when the torque converter is in a locked state and the vehicle is coasting in the prior art. Curve 1 indicates that the torque converter is in a locked state, curve 2 indicates the longitudinal acceleration of the vehicle, curve 3 indicates the accelerator, curve 4 indicates the engine torque, curve 5 indicates the engine speed, curve 6 indicates the transmission input shaft speed, and curve 7 indicates the transmission gear. The vehicle is in a driven state when coasting, and the vehicle enters a driving state after the user steps on the accelerator, so the vehicle state switches from a driven state to a driving state. Figure 2 As shown by curve 1 in the figure, the torque converter is always in a locked state. Figure 2 As shown in curve 3 in FIG, the throttle parameter suddenly changes, indicating that the user stepped on the accelerator at the moment of the sudden change. Figure 2 As shown in curve 4 in FIG. 1 , the vehicle enters the driving state and the engine outputs torque. The engine outputs torque, causing the vehicle to be switched from the driven state to the driving state. Figure 2 It is obvious from curves 2, 5 and 6 in the figure that the longitudinal acceleration of the vehicle, the engine speed and the transmission input shaft speed have all fluctuated, which means that the vehicle has vibrated when switching the vehicle driving state.

[0037] In order to reduce the vehicle vibration problem caused by the change in the torque transmission direction of the transmission system when the torque converter is locked, the prior art provides the following two feasible methods:

[0038] (1) When the vehicle is switched from a driven state to a driving state, the torque at the engine flywheel end is weakened to reduce the vibration generated by the vehicle. This method has a limited effect on reducing the vibration, and on the contrary, it affects the acceleration performance of the vehicle because the initial torque at the flywheel end is weakened, thereby reducing the acceleration experience of the user.

[0039] (2) After the vehicle is switched to the driven state, the torque converter is switched to the clutch state. However, when the torque converter is in the clutch state, the engine will continue to spray fuel. At this time, the engine's fuel consumption cannot be converted into vehicle power, resulting in fuel loss and increased fuel consumption.

[0040] It can be seen that there is currently no effective solution to the vehicle vibration problem caused by the change in the torque transmission direction of the transmission system when the torque converter is locked, without significantly reducing the user's acceleration experience and causing obvious fuel consumption. Therefore, the embodiments in this specification provide a torque converter state switching control method, which reduces the vibration of the vehicle when the torque transmission direction of the vehicle transmission system changes by timely switching the torque converter state.

[0041] like Figure 3 As shown, the method includes:

[0042] S101: When the torque converter of the vehicle is in a locked state, a target instruction is obtained, wherein the target instruction triggers a change in the torque transmission direction of the vehicle's transmission system.

[0043] The embodiments in this specification can put the vehicle's torque converter into a locked state in many scenarios.

[0044] In one embodiment, the torque converter can be placed in a locked state both during vehicle acceleration and deceleration.

[0045] Specifically, in one embodiment, during the acceleration of the vehicle, if the vehicle throttle is less than a preset first throttle threshold and the gear position is greater than the first gear position threshold, the torque converter is placed in a locked state, such as two or more gears with a small throttle acceleration can trigger the torque converter to lock; or, during the acceleration of the vehicle, if the vehicle throttle is greater than a preset second throttle threshold, the torque converter is placed in a locked state, such as one or more gears with a large throttle acceleration can trigger the torque converter to lock; or, during the acceleration of the vehicle, if the vehicle gear position is less than the second gear position threshold and the vehicle speed is greater than the preset speed threshold, the torque converter is placed in a locked state, such as the vehicle is accelerated at a low speed and low gear, the torque converter is placed in a locked state. The preset first throttle threshold and / or the second throttle threshold may be a default setting of the system, or may be set by the user.

[0046] Specifically, in another embodiment, during vehicle deceleration, if the vehicle gear is greater than the second gear threshold, the torque converter is placed in a locked state. For example, if the vehicle decelerates at any gear between the 3rd gear and the 8th gear, the torque converter is placed in a locked state.

[0047] The target instruction described in the embodiments of this specification can trigger a change in the torque transmission direction of the transmission system.

[0048] In a feasible embodiment, the target instruction can trigger the vehicle to switch from the driven state to the driving state. When the vehicle switches from the driven state to the driving state, the torque transmission direction of the transmission system changes. For example, the throttle trigger instruction generated in the vehicle gliding state is a target instruction. The vehicle gliding state is the driven state. When the user steps on the accelerator, the throttle trigger instruction is issued, the vehicle is accelerated, and the vehicle enters the driving state.

[0049] In another feasible embodiment, the target instruction can trigger the vehicle to switch from the driving state to the driven state, and when the vehicle switches from the driving state to the driven state, the direction of the torque transmission of the transmission system changes. For example, the throttle release instruction during the vehicle movement is a target instruction. When the user releases the throttle, the vehicle enters the gliding state, the vehicle switches from the driving state to the driven state, and the direction of the torque transmission of the transmission system changes.

[0050] In one embodiment, before step S101, the method further includes: obtaining the state of the vehicle's torque converter.

[0051] In a feasible embodiment, the hydraulic torque converter can be a comprehensive hydraulic torque converter, which includes hydraulic working conditions, mechanical working conditions and hydraulic-mechanical mixed working conditions. When the lockup clutch in the hydraulic torque converter is in a disengaged state, the hydraulic torque converter is in a hydraulic working condition, at which time the hydraulic torque converter is not locked to realize hydraulic transmission; when the lockup clutch is in a transitional state, the hydraulic torque converter is in a mechanical-hydraulic mixed working condition, at which time the hydraulic torque converter transmits torque by a mechanical and hydraulic mixed method; when the friction plate of the lockup clutch is completely attached, the hydraulic torque converter is in a mechanical working condition, at which time the hydraulic torque converter is locked to realize mechanical transmission. The essence of the lockup control of the hydraulic torque converter is to timely control the engagement and separation of the lockup clutch according to the changes in the external working conditions of the vehicle.

[0052] S103: Acquire state parameters, and determine whether the current vehicle is in a target operating condition based on the state parameters.

[0053] In the embodiments of this specification, if the vehicle meets the target working condition, the state of the torque converter can be switched, that is, under the target working condition, the vehicle vibration caused by the change of the torque transmission direction of the vehicle transmission system can be reduced by switching the state of the torque converter. During the specific implementation of the embodiments of this specification, the target working condition can be set according to the actual situation.

[0054] Specifically, Figure 4 As shown, the step S103 includes:

[0055] S1031: Obtain target operating condition criteria.

[0056] By setting the target operating condition criterion and accurately calibrating the target operating condition criterion used to determine whether the current vehicle enters the target operating condition, the target operating condition can be refined to achieve the purpose of reducing vehicle vibration by controlling the state switching of the torque converter in certain specific scenarios.

[0057] S1033: Obtain the state parameter pointed to by the target operating condition criterion.

[0058] S1035: Determine whether the current vehicle is in the target operating condition based on the state parameter and the target operating condition criterion.

[0059] In one embodiment, the target operating condition is a condition in which acceleration is triggered in a vehicle coasting state, and the corresponding target operating condition criterion includes a first criterion, and the first criterion is used to determine whether the current vehicle is in a coasting state.

[0060] Specifically, in one embodiment, the first criterion may be that the engine torque is less than a preset first threshold. Accordingly, the state parameter is the engine torque; and judging whether the current vehicle is in the target operating condition according to the state parameter and the target operating condition criterion includes:

[0061] It is determined whether the engine torque is less than a first threshold value, and if so, it is determined that the current vehicle meets the target operating condition.

[0062] In another embodiment, the target operating condition criterion also includes a second criterion, which includes one or a combination of a driving mode sub-criteria, a speed sub-criteria, a gear position sub-criteria, a throttle opening sub-criteria, a throttle change rate sub-criteria, and a transmission oil temperature sub-criteria.

[0063] Specifically, the driving mode sub-criterion includes: if the driving mode is in the target driving mode, determining that the current vehicle meets the driving mode sub-criterion.

[0064] In one embodiment, the torque converter state switching control method provided in the embodiment of this specification can be started in a scene where the vehicle is in a certain driving mode, and the scene setting of the driving mode can be realized by designing the driving mode sub-criteria. The target driving mode can be one driving mode or multiple driving modes. For example, the target driving mode can be a comfort mode. In the comfort mode, the user pays attention to the driving experience and has a low tolerance for vehicle vibration. This mode is suitable for using the torque converter state switching control method in the embodiment of this specification to reduce vehicle vibration.

[0065] The speed sub-criterion includes: if the engine speed is less than or equal to a second threshold, determining that the current vehicle meets the speed sub-criterion.

[0066] The gear position sub-criterion includes: if the gearbox gear is in the target gear, determining that the current vehicle meets the gear position sub-criterion.

[0067] Specifically, the target gear may be one or more gears.

[0068] The throttle opening degree sub-criterion includes: if the throttle opening degree is less than or equal to a third threshold value, determining that the current vehicle meets the throttle opening degree sub-criterion.

[0069] The throttle change rate sub-criterion includes: if the throttle change rate is greater than or equal to a fourth threshold, determining that the current vehicle meets the throttle change rate sub-criterion.

[0070] The transmission oil temperature sub-criterion includes: if the transmission oil temperature is within the oil temperature range, determining that the current vehicle meets the transmission oil temperature sub-criterion.

[0071] Correspondingly, judging whether the current vehicle is in the target operating condition according to the state parameter and the target operating condition criterion includes:

[0072] Determining whether the current vehicle satisfies a first criterion and a second criterion at the same time according to the state parameter;

[0073] If so, it is determined that the current vehicle is in the target operating condition.

[0074] In a specific embodiment, the target operating condition criterion includes a first criterion and a second criterion, the second criterion includes a driving mode sub-criterion, a speed sub-criterion, a gear sub-criterion, a throttle opening sub-criterion, a throttle change rate sub-criterion and a transmission oil temperature sub-criterion; the state parameters pointed to by the target operating condition criterion include: engine torque, current driving mode, engine speed, transmission gear, throttle opening, throttle change rate and transmission oil temperature.

[0075] like Figure 5 As shown, it shows a schematic diagram of target working condition judgment, and judging whether the current vehicle is in the target working condition according to the state parameter and the target working condition criterion includes:

[0076] If the engine torque is less than a first threshold,

[0077] The current driving mode is in the target driving mode,

[0078] The engine speed is less than or equal to a second threshold,

[0079] The gearbox gear is in the target gear,

[0080] The throttle opening is less than or equal to a third threshold,

[0081] The throttle change rate is greater than or equal to a fourth threshold,

[0082] and,

[0083] The gearbox oil temperature is within a preset oil temperature range.

[0084] It is then determined whether the current vehicle is in the target operating condition.

[0085] In a feasible embodiment, after obtaining the state parameter and determining whether the current vehicle is in the target operating condition according to the state parameter, the method further includes:

[0086] If the current vehicle is in the target operating condition, the activation flag of the short-term opening function of the torque converter will be activated.

[0087] Specifically, the torque converter short-term opening function activation flag is used to trigger the short-term opening of the torque converter. The short-term opening in the embodiments of this specification can be implemented by setting the time for the torque converter to maintain the open state after being triggered to open.

[0088] S105: If the current vehicle is in the target operating condition, the torque converter is switched to an open state, and after being kept in the open state for a preset time, the torque converter is switched back to a locked state.

[0089] In a feasible embodiment, if the current vehicle is in the target working condition, the torque converter is switched to an open state, and after being kept in the open state for a preset time, the torque converter is switched back to a locked state, such as Figure 6 As shown, including:

[0090] S1051: If the activation flag of the short-term opening function of the torque converter is activated, the torque converter is switched to the open state and the timer is started.

[0091] S1053: When the preset time is reached, the timer triggers the torque converter to switch back to the locked state.

[0092] like Figure 7 As shown, it shows a schematic diagram of the changes in vehicle-related parameters in the scenario of stepping on the accelerator when the vehicle is coasting in the embodiment of this specification in the locked state. Curve 1 represents the state of the torque converter, curve 2 represents the activation flag of the torque converter short-term opening function, curve 3 represents the longitudinal acceleration of the vehicle, curve 4 represents the accelerator, curve 5 represents the engine torque, curve 6 represents the engine speed, curve 7 represents the transmission input shaft speed, and curve 8 represents the actual gear position of the transmission.

[0093] When the vehicle is coasting, it is in the driven state. When the user steps on the accelerator, the vehicle enters the driving state. Therefore, the vehicle state switches from the driven state to the driving state. Figure 7 As shown in curve 4 in FIG, the throttle parameter suddenly changes, indicating that the user stepped on the accelerator at the moment of the sudden change, triggering the vehicle state to switch from the driven state to the driving state. Figure 7 As shown in curve 5 in FIG, the vehicle enters the driving state and the engine outputs torque. The engine outputs torque, causing the vehicle to switch from the driven state to the driving state. Figure 7 As shown in curve 2 in FIG, the activation flag of the short-term opening function of the torque converter is activated, and correspondingly, as shown in curve 1, the torque converter undergoes a short state switch and maintains the open state for a short time. Figure 7Curve 8 in the figure indicates that the actual gear position of the transmission has not changed. Curves 3, 6 and 7 in the figure respectively represent the vehicle longitudinal acceleration, engine speed and transmission input shaft speed. Obviously, when the vehicle is switched from the driven state to the driving state, the engine speed, transmission input shaft speed and vehicle longitudinal acceleration do not fluctuate due to the short opening of the torque converter, which means that the vehicle does not vibrate when the driving state is switched.

[0094] Figure 7 Four key moments are marked in the figure. At moment 1, the triggering condition of the short-term opening function of the torque converter is met, and the activation flag of the short-term opening function of the torque converter is activated; at moment 2, the torque converter lockup clutch is opened, and the torque converter is in the open state; at moment 3, the exit condition of the short-term opening function of the torque converter is met, and the activation flag of the short-term opening function of the torque converter is restored; at moment 4, the torque converter is locked, and the clutch engagement of the torque converter is completed.

[0095] The technical solution described in the embodiments of this specification is implemented with a torque converter as a condition, and can be applied to various vehicles equipped with a torque converter by switching the state of the torque converter to reduce the vibration generated when the output torque direction of the vehicle transmission system is switched. Usually, vehicles equipped with AT automatic transmissions are equipped with a torque converter, and vehicles equipped with CVT continuously variable transmissions can also be equipped with a torque converter. Both types of vehicles can implement the torque converter state switching control method described in the embodiments of this specification.

[0096] The embodiments in this specification are aimed at the problem in the prior art that when the torque converter is locked, due to the inherent clearance of the transmission mechanism in the transmission system and the fact that the transmission system is in a hard-connected state, the transmission components collide when the output torque direction of the transmission system is switched, thereby causing the whole vehicle to oscillate. A torque converter state switching control method is proposed. The control method can accurately identify the target working condition and control the torque converter to open quickly and briefly under the target working condition, so as to absorb the shock caused by the collision of the transmission components when the torque transmission direction of the transmission system is switched, thereby reducing the vehicle vibration, and by controlling the torque converter to close again after being briefly opened, the oil consumption is reduced, and the vehicle fuel consumption is taken into account while achieving vehicle shock absorption, thereby smoothing the user's driving experience while ensuring fuel economy.

[0097] The embodiments of this specification also provide a torque converter state switching control device, such as Figure 8 As shown, the device comprises:

[0098] The target instruction acquisition module 201 is used to acquire a target instruction when the torque converter of the vehicle is in a locked state, wherein the target instruction triggers a change in the torque transmission direction of the vehicle's transmission system.

[0099] In a feasible embodiment, the hydraulic torque converter can be a comprehensive hydraulic torque converter, which includes hydraulic working conditions, mechanical working conditions and hydraulic-mechanical mixed working conditions. When the lockup clutch in the hydraulic torque converter is in a disengaged state, the hydraulic torque converter is in a hydraulic working condition, at which time the hydraulic torque converter is not locked to realize hydraulic transmission; when the lockup clutch is in a transitional state, the hydraulic torque converter is in a mechanical-hydraulic mixed working condition, at which time the hydraulic torque converter transmits torque by a mechanical and hydraulic mixed method; when the friction plate of the lockup clutch is completely attached, the hydraulic torque converter is in a mechanical working condition, at which time the hydraulic torque converter is locked to realize mechanical transmission. The essence of the lockup control of the hydraulic torque converter is to timely control the engagement and separation of the lockup clutch according to the changes in the external working conditions of the vehicle.

[0100] In a feasible embodiment, the target instruction can trigger the vehicle to switch from the driven state to the driving state. When the vehicle switches from the driven state to the driving state, the torque transmission direction of the transmission system changes. For example, the throttle trigger instruction generated in the vehicle gliding state is a target instruction. The vehicle gliding state is the driven state. When the user steps on the accelerator, the throttle trigger instruction is issued, the vehicle is accelerated, and the vehicle enters the driving state.

[0101] In another feasible embodiment, the target instruction can trigger the vehicle to switch from the driving state to the driven state, and when the vehicle switches from the driving state to the driven state, the direction of the torque transmission of the transmission system changes. For example, the throttle release instruction during the vehicle movement is a target instruction. When the user releases the throttle, the vehicle enters the gliding state, the vehicle switches from the driving state to the driven state, and the direction of the torque transmission of the transmission system changes.

[0102] The target operating condition determination module 203 is used to obtain state parameters and determine whether the current vehicle is in the target operating condition according to the state parameters.

[0103] The state switching module 205 is used to switch the torque converter to an open state if the current vehicle is in a target operating condition, and after maintaining the open state for a preset time, switch the torque converter back to a locked state.

[0104] A target operating condition criterion acquisition unit 2031 is used to acquire a target operating condition criterion;

[0105] A state parameter acquisition unit 2033, used to acquire the state parameter pointed to by the target operating condition criterion;

[0106] The judgment unit 2035 is used to judge whether the current vehicle is in the target operating condition according to the state parameter and the target operating condition criterion.

[0107] In one embodiment, the target operating condition is a condition in which acceleration is triggered in a vehicle coasting state. Accordingly, the target operating condition criterion includes a first criterion for determining whether the current vehicle is in a coasting state.

[0108] In another embodiment, the target operating condition criterion also includes a second criterion, which includes one or a combination of a driving mode sub-criteria, a speed sub-criteria, a gear position sub-criteria, a throttle opening sub-criteria, a throttle change rate sub-criteria, and a transmission oil temperature sub-criteria.

[0109] In a specific embodiment, the target operating condition criterion acquisition unit 2031 can acquire a first criterion and a second criterion, wherein the second criterion includes a driving mode sub-criterion, a speed sub-criterion, a gear sub-criterion, a throttle opening sub-criterion, a throttle change rate sub-criterion and a transmission oil temperature sub-criterion; the state parameters pointed to by the target operating condition criterion include: engine torque, current driving mode, engine speed, transmission gear, throttle opening, throttle change rate and transmission oil temperature.

[0110] The judging unit 2035 is used to perform the following judging steps:

[0111] If the engine torque is less than a first threshold,

[0112] The current driving mode is in the target driving mode,

[0113] The engine speed is less than or equal to a second threshold,

[0114] The gearbox gear is in the target gear,

[0115] The throttle opening is less than or equal to a third threshold,

[0116] The throttle change rate is greater than or equal to a fourth threshold,

[0117] and,

[0118] The gearbox oil temperature is within a preset oil temperature range.

[0119] It is then determined whether the current vehicle is in the target operating condition.

[0120] It should be noted that the device provided in the above embodiment, when implementing its functions, is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0121] In one embodiment, a vehicle is also provided, which may include an engine, a torque converter, a gearbox and tires, and the engine is equipped with an AT automatic transmission or a CVT continuously variable transmission.

[0122] The torque converter can be a comprehensive torque converter, which includes a hydraulic working condition, a mechanical working condition and a hydraulic-mechanical mixed working condition. When the lockup clutch in the torque converter is in a disengaged state, the torque converter is in a hydraulic working condition, at which time the torque converter does not lock up to realize hydraulic transmission; when the lockup clutch is in a transitional state, the torque converter is in a mechanical-hydraulic mixed working condition, at which time the torque converter transmits torque by a mechanical and hydraulic mixed method; when the friction plate of the lockup clutch is completely attached, the torque converter is in a mechanical working condition, at which time the torque converter locks up to realize mechanical transmission. The essence of the lockup control of the torque converter is to timely control the engagement and separation of the lockup clutch according to the changes in the external working conditions of the vehicle.

[0123] The vehicle includes a torque converter state switching control device provided in an embodiment of this specification, including:

[0124] The target instruction acquisition module is used to acquire a target instruction when the hydraulic torque converter of the vehicle is in a locked state, wherein the target instruction triggers a change in the torque transmission direction of the vehicle's transmission system.

[0125] The target operating condition determination module is used to obtain state parameters and determine whether the current vehicle is in the target operating condition based on the state parameters.

[0126] The state switching module is used to switch the hydraulic torque converter to an open state if the current vehicle is in a target operating condition, and after maintaining the hydraulic torque converter in the open state for a preset time, switch the hydraulic torque converter back to a locked state.

[0127] A torque converter state switching control device included in a vehicle provided in an embodiment of the present specification belongs to the same inventive concept as the torque converter state switching control method and device mentioned above, and the details are not repeated here.

[0128] In one embodiment, the vehicle may further include an on-board terminal, the on-board terminal including: a processor, a memory, a communication interface and a communication bus, the processor, the memory and the communication interface are connected through the communication bus and communicate with each other;

[0129] The memory stores executable program codes, and the communication interface is used for wireless communication;

[0130] The processor is used to call the executable program code in the memory to execute to implement the torque converter state switching control method provided in the above method embodiment.

[0131] In one embodiment, a computer storage medium is also provided, in which at least one instruction or at least one program is stored, and the at least one instruction or at least one program is loaded and executed by a processor to implement a torque converter state switching control method provided in an embodiment of this specification.

[0132] The storage medium may be located in at least one of the multiple network servers of the computer network. Optionally, in this embodiment, the storage medium may include, but is not limited to, various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0133] Specifically, the method for controlling state switching of a torque converter comprises:

[0134] When the torque converter of the vehicle is in a locked state, obtaining a target instruction, wherein the target instruction triggers a change in the torque transmission direction of the transmission system of the vehicle;

[0135] Acquiring state parameters, and determining whether the current vehicle is in a target operating condition according to the state parameters;

[0136] If the current vehicle is in the target operating condition, the torque converter is switched to an open state, and after being kept in the open state for a preset time, the torque converter is switched back to a locked state.

[0137] It should be noted that the order of the embodiments in the above description is only for description and does not represent the advantages and disadvantages of the embodiments. The above description is a specific embodiment of the present description. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0138] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and vehicle embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0139] The above description has fully disclosed the specific embodiments of the present invention. It should be pointed out that any changes made by those skilled in the art to the specific embodiments of the present invention do not deviate from the scope of the claims of the present invention. Accordingly, the scope of the claims of the present invention is not limited to the above specific embodiments.

Claims

1. A method for controlling a state switching of a torque converter, characterized in that: The method comprises: when the hydraulic torque converter of the vehicle is in a locked state, obtaining a target instruction, wherein the target instruction triggers a change in the torque transmission direction of the vehicle's transmission system; obtaining a state parameter, and judging whether the current vehicle is in a target working condition according to the state parameter; if the current vehicle is in the target working condition, switching the hydraulic torque converter to an open state, and after maintaining the hydraulic torque converter in the open state for a preset time, switching the hydraulic torque converter back to a locked state; The acquiring of the state parameter and judging whether the current vehicle is in the target operating condition according to the state parameter include: Obtain target working condition criteria; Obtaining the state parameter pointed to by the target operating condition criterion; Determining whether the current vehicle is in the target operating condition according to the state parameter and the target operating condition criterion; The target operating condition criterion includes a first criterion and a second criterion; the first criterion is that the engine torque is less than a first threshold value, and the second criterion includes a driving mode sub-criterion, a speed sub-criterion, a gear position sub-criterion, a throttle opening sub-criterion, a throttle change rate sub-criterion and a gearbox oil temperature sub-criterion; The obtaining of the state parameter pointed to by the target operating condition criterion comprises: Obtain engine torque, current driving mode, engine speed, transmission gear, throttle opening, throttle change rate and transmission oil temperature; The determining whether the current vehicle is in the target operating condition according to the state parameter and the target operating condition criterion includes: If the engine torque is less than a first threshold, the current driving mode is in a target driving mode and the target driving mode is a comfort mode, the engine speed is less than or equal to a second threshold, the transmission gear is in a target gear, the throttle opening is less than or equal to a third threshold, the throttle change rate is greater than or equal to a fourth threshold, and the transmission oil temperature is within a preset oil temperature range, it is determined that the current vehicle is in a target operating condition.

2. The method according to claim 1, characterized in that When the torque converter of the vehicle is in a locked state, a target instruction is obtained, and before the target instruction triggers a change in the torque transmission direction of the vehicle's transmission system, the method further includes: obtaining the state of the torque converter of the vehicle.

3. The method according to claim 1 or 2, characterized in that: During acceleration or deceleration of the vehicle, the torque converter is placed in a locked state.

4. The method according to claim 3, characterized in that The torque converter is placed in a locked state during the acceleration or deceleration of the vehicle, including: during the acceleration of the vehicle, if the vehicle throttle is less than a preset first throttle threshold and the gear is greater than a first gear threshold, the torque converter is placed in a locked state; or, during the acceleration of the vehicle, if the vehicle throttle is greater than a preset second throttle threshold, the torque converter is placed in a locked state; or, during the acceleration of the vehicle, if the vehicle gear is less than the second gear threshold and the vehicle speed is greater than a preset speed threshold, the torque converter is placed in a locked state.

5. The method according to claim 3, characterized in that: The torque converter is placed in a locked state during the acceleration or deceleration of the vehicle, including: during the deceleration of the vehicle, if the vehicle gear is greater than the second gear threshold, the torque converter is placed in a locked state.

6. The method according to claim 1 or 2, characterized in that: The target instruction triggers the vehicle to switch from a driven state to a driving state, or triggers the vehicle to switch from a driving state to a driven state.

7. The method according to claim 6, characterized in that: The target instruction is a throttle trigger instruction generated in the vehicle's gliding state, or a throttle release instruction during the vehicle's motion process.

8. The method according to claim 1, characterized in that: The torque converter is a comprehensive torque converter, which includes a hydraulic working condition, a mechanical working condition and a hydraulic-mechanical mixed working condition. When the lockup clutch in the torque converter is in a disengaged state, the torque converter is in a hydraulic working condition, and the torque converter is not locked to realize hydraulic transmission; when the lockup clutch is in a transitional state, the torque converter is in a mechanical-hydraulic mixed working condition, and the torque converter transmits torque by a mechanical and hydraulic mixed method; when the friction plate of the lockup clutch is fully fitted, the torque converter is in a mechanical working condition, and the torque converter is locked to realize mechanical transmission.

9. The method according to claim 1, characterized in that: The method of obtaining the state parameter and determining whether the current vehicle is in the target operating condition according to the state parameter further includes: if the current vehicle is in the target operating condition, activating a hydraulic torque converter short-term opening function activation flag.

10. The method according to claim 9, characterized in that If the current vehicle is in the target operating condition, the torque converter is switched to an open state. After maintaining the open state for a preset time, the torque converter is switched back to a locked state, including: if the torque converter short-term opening function activation flag is activated, the torque converter is switched to an open state and a timer is started; when the preset time is reached, the timer triggers the torque converter to switch back to a locked state.

11. A torque converter state switching control device, characterized in that: The device comprises: a target instruction acquisition module, used for acquiring a target instruction when the hydraulic torque converter of the vehicle is in a locked state, wherein the target instruction triggers a change in the torque transmission direction of the vehicle's transmission system; a target working condition determination module, used for acquiring a state parameter, and judging whether the current vehicle is in a target working condition according to the state parameter; a state switching module, used for switching the hydraulic torque converter to an open state if the current vehicle is in the target working condition, and switching the hydraulic torque converter back to a locked state after maintaining the hydraulic torque converter in the open state for a preset time; The target operating condition determination module comprises: A target operating condition criterion obtaining unit, used for obtaining a target operating condition criterion; A state parameter acquisition unit, used to acquire the state parameter pointed to by the target operating condition criterion; A judging unit, used for judging whether the current vehicle is in the target operating condition according to the state parameter and the target operating condition criterion; The target operating condition criterion includes a first criterion and a second criterion; the first criterion is that the engine torque is less than a first threshold value, and the second criterion includes a driving mode sub-criterion, a speed sub-criterion, a gear position sub-criterion, a throttle opening sub-criterion, a throttle change rate sub-criterion and a gearbox oil temperature sub-criterion; The obtaining of the state parameter pointed to by the target operating condition criterion comprises: Obtain engine torque, current driving mode, engine speed, transmission gear, throttle opening, throttle change rate and transmission oil temperature; The determining whether the current vehicle is in the target operating condition according to the state parameter and the target operating condition criterion includes: If the engine torque is less than a first threshold, the current driving mode is in a target driving mode and the target driving mode is a comfort mode, the engine speed is less than or equal to a second threshold, the transmission gear is in a target gear, the throttle opening is less than or equal to a third threshold, the throttle change rate is greater than or equal to a fourth threshold, and the transmission oil temperature is within a preset oil temperature range, it is determined that the current vehicle is in a target operating condition.

12. A vehicle, characterized in that: The vehicle includes a torque converter state switching control device as described in claim 11.

13. A computer storage medium, characterized in that: The computer storage medium stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by the processor to implement a torque converter state switching control method as described in any one of claims 1-10.

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