Clutch control method and device based on automatic transmission vehicle and vehicle

Abstract

The embodiment of the invention relates to a clutch control method and device based on an automatic transmission vehicle and the vehicle. The method comprises the steps that whether the vehicle is in a preset neutral gear sliding working condition or not is detected; when the vehicle is in the preset neutral-gear sliding entering working condition, whether the vehicle meets a preset neutral-gear sliding forbidding condition or not is determined, and the preset neutral-gear sliding forbidding condition is used for forbidding neutral-gear sliding of the vehicle; and when the preset neutral gear sliding forbidding condition is met, the fourth clutch is controlled to be switched from the closed state to the open state, and when the fourth clutch is in the open state, the vehicle does not conduct neutral gear sliding. According to the technical scheme, on the basis that the control cost is not increased, the problem of neutral gear sliding of the vehicle is avoided, and the driving experience of a user is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle control, and particularly to a clutch control method, device and vehicle for an automatic transmission vehicle. Background Art

[0002] Vehicles equipped with automatic transmissions are becoming increasingly common. Among them, when the shift lever requests neutral, the corresponding clutch of the transmission is also controlled to be in neutral, and the transmission clutch hardware chain has been opened, but the vehicle will creep at a low speed, that is, the vehicle will experience neutral coasting.

[0003] In related technologies, improvements have been made from the hardware aspect to avoid vehicle neutral coasting. For example, a closable fixing device is installed on the drive shaft of the vehicle. When it is detected that the shift lever requests neutral, the fixing device is closed to lock the drive shaft, thereby avoiding vehicle neutral coasting.

[0004] However, in the above method of avoiding vehicle neutral coasting by hardware improvement, the control cost is increased, and unexpected problems may occur after the hardware improvement, affecting the driving experience of users. Summary of the Invention

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a clutch control method, device and vehicle for an automatic transmission vehicle.

[0006] An embodiment of the present disclosure provides a clutch control method for an automatic transmission vehicle. The vehicle includes a brake, a first clutch, a second clutch, a third clutch and a fourth clutch. When the vehicle is in neutral, the brake and the fourth clutch are default in a closed state. Among them, the fourth clutch transmits torque to the vehicle in the closed state, and the first clutch, the second clutch and the third clutch are default in an open state. The method includes: detecting whether the vehicle is in a preset neutral coasting entry condition; when in the preset neutral coasting entry condition, determining whether the vehicle meets a preset neutral coasting prohibition condition, where the preset neutral coasting prohibition condition is used to prohibit the vehicle from neutral coasting; when meeting the preset neutral coasting prohibition condition, controlling the fourth clutch to switch from the closed state to the open state, where when the fourth clutch is in the open state, the vehicle does not perform neutral coasting.

[0007] An embodiment of the present disclosure further provides a clutch control device for a vehicle with an automatic transmission. The vehicle includes a brake, a first clutch, a second clutch, a third clutch, and a fourth clutch. When the vehicle is in neutral, the brake and the fourth clutch are default in a closed state. Among them, the fourth clutch transmits torque to the vehicle in the closed state, and the first clutch, the second clutch, and the third clutch are default in an open state. The device includes: a detection module for detecting whether the vehicle is in a preset neutral coasting entry condition; a determination module for determining whether the vehicle meets a preset prohibition of neutral coasting condition when in the preset neutral coasting entry condition, where the preset prohibition of neutral coasting condition is used to prohibit the vehicle from neutral coasting; a control module for controlling the fourth clutch to switch from a closed state to an open state when the preset prohibition of neutral coasting condition is met, where when the fourth clutch is in an open state, the vehicle does not perform neutral coasting.

[0008] An embodiment of the present disclosure further provides a vehicle, which includes: a processor; a memory for storing executable instructions of the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the clutch control method for a vehicle with an automatic transmission provided by the embodiment of the present disclosure.

[0009] An embodiment of the present disclosure further provides a computer-readable storage medium, which stores a computer program for executing the clutch control method for a vehicle with an automatic transmission provided by the embodiment of the present disclosure.

[0010] The technical solution provided by the embodiment of the present disclosure has the following advantages compared with the prior art: The clutch control solution for a vehicle with an automatic transmission provided by the embodiment of the present disclosure detects whether the vehicle is in a preset neutral coasting entry condition. When in the preset neutral coasting entry condition, it determines whether the vehicle meets a preset prohibition of neutral coasting condition, where the preset prohibition of neutral coasting condition is used to prohibit the vehicle from neutral coasting. Furthermore, when the preset prohibition of neutral coasting condition is met, it controls the fourth clutch to switch from a closed state to an open state, where when the fourth clutch is in an open state, the vehicle does not perform neutral coasting. In this technical solution, without increasing the control cost, it can solve the problem that the vehicle coasts in neutral on a horizontal road due to the drag of the hardware when in neutral, which affects the safety of the vehicle and the driver, and improves the driving experience of the user. Description of the Drawings

[0011] In conjunction with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the original components and elements are not necessarily drawn to scale.

[0012] Figure 1 It is a schematic flowchart of a clutch control method for a vehicle with an automatic transmission provided by an embodiment of the present disclosure; Figure 2 It is a schematic flowchart of another clutch control method for a vehicle with an automatic transmission provided by an embodiment of the present disclosure; Figure 3 It is a schematic structural diagram of a clutch control device for a vehicle with an automatic transmission provided by an embodiment of the present disclosure; Figure 4 It is a schematic structural diagram of a vehicle provided by an embodiment of the present disclosure. Specific Embodiments

[0013] The embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0014] It should be understood that the various steps recorded in the method embodiments of the present disclosure can be executed in different orders and / or executed in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this regard.

[0015] As used herein, the term "including" and its variants are open-ended, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0016] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules, or units, and are not used to limit the order of the functions performed by these devices, modules, or units or their interdependent relationships.

[0017] It should be noted that the modifications of "one" and "multiple" mentioned in this disclosure are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0018] The names of the messages or information exchanged between multiple devices in the embodiments of this disclosure are only for illustrative purposes and are not used to limit the scope of these messages or information.

[0019] To solve the above problems, the embodiments of this disclosure provide a clutch control method for an automatic transmission vehicle. The method will be introduced below in combination with specific embodiments.

[0020] Figure 1 FIG. is a schematic flow chart of a clutch control method for an automatic transmission vehicle provided by an embodiment of this disclosure. This method can be executed by a clutch control device for an automatic transmission vehicle, where the device can be implemented by software and / or hardware and is generally integrated in a vehicle. The vehicle includes a brake, a first clutch, a second clutch, a third clutch, and a fourth clutch. When the vehicle is in neutral, the brake and the fourth clutch are default in a closed state. Among them, the fourth clutch transmits torque to the vehicle in the closed state, and the first clutch, the second clutch, and the third clutch are default in an open state. Among them, different combinations of closures of the first clutch, the second clutch, the third clutch, and the fourth clutch can achieve different driving gears of the vehicle, and the specific combination method can be set according to the control scenario.

[0021] As mentioned in the above embodiments, when the vehicle is in neutral, the power of the vehicle is unloaded by disconnecting the first clutch, the second clutch, and the third clutch. However, in fact, due to the influence of drag (usually referring to the liquid flow between the pump impeller and the turbine in the torque converter), that is, the torque converter is a key component in the automatic transmission for transmitting engine power, and it transmits torque through hydraulic oil between the pump impeller and the turbine. Even in the neutral state, if the liquid flow in the torque converter does not completely stop, there may still be a certain power transmission effect. In some cases, especially when the engine speed is high, the liquid flow inside the torque converter may cause slight power transmission, causing the vehicle to still be able to move slowly when it should theoretically be in neutral, resulting in the problem of coasting in neutral. To avoid this problem, in the solution proposed by this disclosure, under certain conditions, the fourth clutch is controlled to disconnect to cut off the power transmission path between the engine and the input shaft, thereby solving the problem of coasting in neutral caused by the incomplete disconnection of the powertrain due to hardware drag.

[0022] As Figure 1 shown, the method includes: Step 101, detect whether the vehicle is in a preset neutral coasting entry condition.

[0023] Among them, the preset neutral coasting entry condition is used to indicate that the current condition of the vehicle may exhibit the phenomenon of neutral coasting. Among them, in different application scenarios, the preset neutral coasting entry condition is different. As a possible implementation, the preset neutral coasting entry condition includes: (1) The preset neutral coasting prohibition function switch of the vehicle is in a preset on state; Among them, when the preset neutral coasting prohibition function switch is in the preset on state, it indicates that there is a problem of neutral coasting in the vehicle. The preset neutral coasting prohibition function indicates the function of prohibiting the vehicle from neutral coasting. If this function is enabled, relevant processing for prohibiting the vehicle from neutral coasting will be executed.

[0024] In this embodiment, the preset neutral coasting prohibition function switch can be defined as flg_NPSlidEn. This switch is mainly a calibration switch for whether to enable the neutral coasting prohibition function. For example, a certain automatic transmission does not have the problem of neutral coasting, so there is no need to inhibit the enabling of the neutral coasting function. For example, the transmission with neutral coasting caused by drag loss has been solved from a hardware perspective, so there is no need to turn on this function either. In order to ensure software platform management, the function switch can be set according to the needs of different vehicle models, facilitating software platformization and software matching the needs of different transmissions and vehicles.

[0025] And, (2) The currently engaged clutch of the vehicle is the fourth clutch; In this embodiment, the fourth clutch mainly refers to the clutch that is not engaged based on the control logic of the vehicle. In this embodiment, it refers to the fourth clutch.

[0026] And, (3) The shift lever position in the vehicle is in the neutral position.

[0027] In this embodiment, when the shift lever position in the vehicle is in the neutral position, it indicates that the driver does not desire the vehicle to have forward or reverse power requirements. At this time, the driver does not have real-time driving ability. If the vehicle slips at this time, it will affect the safety of the vehicle and personnel. Therefore, it is initially considered that the vehicle is in a condition where neutral coasting is prohibited.

[0028] And, (4) The control gear of the automatic transmission is in neutral, or is in the process of shifting from another gear to neutral; In this embodiment, when the control gear of the automatic transmission is in the neutral gear, i.e., the N gear, or when the automatic transmission is in the process of shifting from other gears to the neutral gear, for example, in the shifting process of D1→N, D2→N, R→N, it is initially considered that the vehicle is in the working condition where neutral coasting is prohibited. If the above gear changes occur, it means that the automatic transmission is in the neutral gear or is switching to the neutral gear according to the driver's intention. At this time, in order to quickly respond to entering the neutral gear, the function of prohibiting neutral coasting can be immediately enabled, and control can be carried out in a timely manner during the shifting process to suppress the coasting torque of the vehicle caused by drag. If this function is not enabled in a timely manner, abnormal clutch pressure control will occur when entering the driving gear, which may cause the vehicle to jerk.

[0029] And / or, (5)When the vehicle is a four-wheel drive system, the four-wheel drive system is in a fixed four-wheel drive gear ratio.

[0030] When the vehicle is a four-wheel drive system, the transfer case mainly includes a high-speed four-wheel drive mode, i.e., the 4H mode, and a low-speed four-wheel drive mode, i.e., the 4L mode. When the gear ratio of the 4H or 4L mode of the transfer case of the four-wheel drive system is fixed, the function of prohibiting neutral coasting is allowed to be enabled. If the four-wheel drive system is not in a fixed four-wheel drive gear ratio at this time, the shifting quality of the transmission will be affected during the shifting process of the automatic transmission. Therefore, the function of prohibiting neutral coasting is not allowed to be enabled when the four-wheel drive system is not in a fixed four-wheel drive gear ratio.

[0031] In this embodiment, when the preset neutral coasting entry working condition is satisfied, flg_NPSlidEn = 1 can be assigned to indicate that the vehicle satisfies the function of prohibiting vehicle coasting.

[0032] Step 102, when in the preset neutral coasting entry working condition, determine whether the vehicle satisfies the preset condition for prohibiting neutral coasting, where the preset condition for prohibiting neutral coasting is used for the vehicle to prohibit neutral coasting.

[0033] In the embodiment of the present disclosure, when in the preset neutral coasting entry working condition, determine whether the vehicle satisfies the preset condition for prohibiting neutral coasting, where the preset condition for prohibiting neutral coasting is used for the vehicle to prohibit neutral coasting, that is, when in the preset neutral coasting entry working condition, further determine whether the relevant processing of prohibiting neutral coasting can be performed.

[0034] Among them, the preset condition for prohibiting neutral coasting can be calibrated according to the application scenario. In some possible embodiments, the preset condition for prohibiting neutral coasting includes: (1)The vehicle is in the preset neutral coasting entry working condition.

[0035] For example, in this embodiment, it can be determined that flg_NPSlidEn = 1.

[0036] And, (2) The vehicle is in neutral gear.

[0037] That is, in this embodiment, it is determined that both the shift lever and the automatic transmission of the vehicle are in the neutral state.

[0038] And, (3) The preset braking device of the vehicle is in an unactivated state.

[0039] Among them, the preset braking device of the vehicle may include the entire vehicle braking systems such as the handbrake and the brake. In this embodiment, since neutral coasting mainly occurs when the driver shifts the transmission gear to neutral, but the driver does not apply braking to the entire vehicle. If the entire vehicle has braking, the drag of the transmission will not cause the vehicle to move forward or reverse at a vehicle speed. Therefore, it is necessary to determine that the preset braking device of the vehicle is in an unactivated state.

[0040] In the embodiments of the present disclosure, for the convenience of control, flg_NPSlidNESS may also be defined to indicate the preset prohibited neutral coasting condition. When flg_NPSlidNESS = 1, it is considered that the preset prohibited neutral coasting condition is satisfied.

[0041] Step 103, when the preset prohibited neutral coasting condition is satisfied, control the fourth clutch to switch from the closed state to the open state. When the fourth clutch is in the open state, the vehicle does not perform neutral coasting.

[0042] In the embodiments of the present disclosure, when the preset prohibited neutral coasting condition is satisfied, control the fourth clutch to switch from the closed state to the open state. When the fourth clutch is in the open state, the vehicle does not perform neutral coasting. That is, in this embodiment, when the fourth clutch switches from the closed state to the open state, the power transmission between the transmission and the vehicle is further cut off, and the vehicle will not have the problem of neutral coasting due to drag.

[0043] In an embodiment of the present disclosure, in order to further ensure that the switching of the fourth clutch from the closed state to the open state meets the driving requirements of the driver, before controlling the fourth clutch to switch from the closed state to the open state, it is also necessary to determine that the triggering condition for the fourth clutch to switch from the closed state to the open state is satisfied.

[0044] In some possible embodiments, the triggering conditions for the fourth clutch to switch from the closed state to the open state may include: (1) flg_NPSlidNESS = 1 in the above embodiments; (2) In the above embodiments, flg_NPSlidEn = 1, and the current slope of the vehicle is less than the preset slope threshold. The preset slope threshold can be calibrated according to the actual situation of different vehicle models or different transmissions. For example, the preset slope threshold can be 3%, and the output shaft of the transmission is 0. And the driver has a process of stepping on the brake or operating the vehicle brake. This condition is mainly to illustrate that the driver has the intention of braking and stopping, and has the need not to allow the vehicle to coast in neutral. If the driver does not have the need not to allow the vehicle to coast in neutral, there is no need to enable the control clutch Open to inhibit coasting in neutral.

[0045] When one of the sub-conditions in this condition (2) is not satisfied, it is considered that condition (2) is not satisfied, and condition (2) is re-monitored for whether it holds. For example, when flg_NPSlidEn = 0, or the state of the fourth clutch is already in the open state, condition (2) can be reset, that is, condition (2) is re-monitored for whether it holds.

[0046] (3) On the basis that the above condition (2) holds, the current driver has no need to step on the brake or pull up the handbrake, and the current vehicle braking condition is set to 0 (sub-condition 1 of condition (3)); And, the current output shaft speed is greater than the preset value or the wheel speed is greater than the preset value. The preset value corresponding to the output shaft speed can be 5 rpm, and the preset value corresponding to the wheel speed can be 0.1 km / h (sub-condition 2 of condition (3)). Condition (3) indicates that when the vehicle is in neutral, the driver does not manually enable the function of inhibiting coasting in neutral.

[0047] In this embodiment, in order to avoid misjudgment of condition (3), it is considered that condition (3) holds only after sub-condition 1 and sub-condition 2 corresponding to condition (3) hold simultaneously for more than the preset duration. The preset duration can be calibrated according to the scenario. For example, the preset duration can be 500 ms.

[0048] After the above conditions (1)-(3) hold, control the fourth clutch to switch from the closed state to the open state.

[0049] Among them, when controlling the fourth clutch to switch from the closed state to the open state, the control pressure of the fourth clutch can be directly set to 0 bar. The control pressure of the clutch refers to the pressure provided by the hydraulic system used to operate the clutch. This pressure determines the contact force between the clutch plates, thereby affecting the effect of power transmission from the engine to the wheels. When the clutch control pressure increases, the clutch plates are pressed together, enabling the power of the engine to be transmitted to the wheels through the planetary gear set. When the clutch control pressure decreases or is released, the clutch plates loosen, cutting off the power connection between the engine and the wheels. In summary, the clutch control method for an automatic transmission vehicle according to the embodiments of the present disclosure detects whether the vehicle is in a preset neutral coasting entry condition. When in the preset neutral coasting entry condition, it determines whether the vehicle meets the preset prohibited neutral coasting condition, where the preset prohibited neutral coasting condition is used to prohibit the vehicle from neutral coasting. Furthermore, when the preset prohibited neutral coasting condition is met, it controls the fourth clutch to switch from the closed state to the open state. When the fourth clutch is in the open state, the vehicle does not perform neutral coasting. In this technical solution, without increasing the control cost, it can solve the problem of the vehicle coasting in neutral on a horizontal road surface due to the drag of the hardware when in neutral, which affects the safety of the vehicle and the driver, and improves the driving experience of the user.

[0050] Based on the above embodiments, during actual driving, after neutral coasting is prohibited, it is possible that the driver has subsequent driving needs, etc. Therefore, to meet the driving needs, the fourth clutch is also controlled to switch from the open state to the closed state when needed.

[0051] In an embodiment of the present disclosure, as Figure 2 shown, the method further includes: Step 201, detecting whether the vehicle meets the preset driving conditions.

[0052] When the fourth clutch is in the open state, it is detected whether the vehicle meets the preset driving conditions, and the preset driving conditions are used to indicate whether the driver currently has a driving need.

[0053] It should be noted that in different application scenarios, the preset driving conditions are different. Examples are as follows: In some possible embodiments, the preset driving conditions include: (1) flg_NPSlidNESS = 0 in the above embodiments, that is, the condition for prohibiting neutral coasting is not established.

[0054] For example, when the current driver has a gear shifting need, the current gear position of the shift lever is not in neutral or the gear position inside the transmission is not in neutral, the driver releases the brake, and the driver has the intention to drive the vehicle forward. At this time, it is considered that the preset driving conditions are met.

[0055] Step 202, when the preset driving conditions are met, control the fourth clutch to enter the first preset stage, where in the first preset stage, the fourth clutch undergoes an oil filling process.

[0056] It should be understood that based on the control logic of the clutch, the clutch cannot directly switch from the open state to the closed state and needs to go through intermediate stages. In this embodiment, it needs to go through intermediate stages such as the first preset stage to the fourth preset stage. Among them, the specific content of the first preset stage to the fourth preset stage can be set according to the scenario. For example, in some possible embodiments, the first preset stage is the Boost oil filling stage, the second preset stage is the Kp stage, the Kp stage is the pressure increasing stage, the third preset stage is the SpdStart stage, the SpdStart stage further increases the pressure of the clutch, and the fourth stage is the SpdSyn stage. In the SpdSyn stage, the pressure of the clutch is further increased until the clutch is tightly attached.

[0057] In this embodiment, when the preset driving conditions are met, control the fourth clutch to enter the first preset stage, where in the first preset stage, the fourth clutch undergoes an oil filling process.

[0058] In this embodiment, control the oil filling of the fourth clutch according to a preset pressure value, where the preset pressure value can be set according to the scenario. In some possible embodiments, the preset pressure value is 4 bar.

[0059] Step 203, in the first preset stage, monitor whether the fourth clutch meets the end condition of the first preset stage.

[0060] In this embodiment, monitor whether the fourth clutch meets the end condition of the first preset stage, so as to end the control of the first preset stage and enter the second preset stage after the end condition of the first preset stage is met.

[0061] Among them, in some possible embodiments, the end condition of the first preset stage includes detecting that the oil filling amount in the clutch and the oil passage is greater than a preset oil amount threshold.

[0062] In some possible embodiments, it is also possible to indirectly ensure that the oil filling amount in the clutch and the oil passage reaches a certain value by detecting the oil filling duration of the clutch.

[0063] In this embodiment, determine the current temperature of the fourth clutch, and query a preset first table according to the current temperature of the fourth clutch to obtain an oil filling time compensation value. That is, the temperature of the clutch has an impact on the oil filling time. For example, the higher the temperature, the thinner the hydraulic oil becomes and the better its fluidity. This enables the hydraulic oil to flow through the valves and pipes faster, thereby shortening the oil filling time.

[0064] Among them, the preset first table can be calibrated according to the scenario. In some possible embodiments, the first table is shown in Table 1 below: Table 1

[0065] In this embodiment, obtain the preset basic oil filling time of the fourth clutch. The preset basic oil filling time can be marked as BaseTime, and BaseTime is calibrated according to the scenario. For example, BaseTime is 110 ms. In this embodiment, also obtain the remaining oil filling percentage of the fourth clutch. The remaining oil filling percentage can be calculated when the fourth clutch is in the oil discharging stage before Boost. The calculation method of the remaining oil filling percentage can be obtained from the prior art and will not be elaborated here.

[0066] In this embodiment, a self-learning method is also used to determine the self-learning oil filling duration of the fourth clutch. The self-learning oil filling duration is another oil filling time compensation value for the oil filling duration. Among them, the self-learning method includes but is not limited to deep model learning, etc. Any method that can obtain the self-learning oil filling duration based on self-learning belongs to the protection embodiments of the present disclosure. For example, when the vehicle shifts gears, collect the preset oil filling time and the actual oil filling time, and determine the self-learning oil filling duration based on the difference between the actual oil filling time and the preset oil filling time.

[0067] In this embodiment, according to the remaining oil filling percentage, the preset basic oil filling time, the oil filling time compensation value, the preset minimum oil filling duration, and the self-learning oil filling duration, calculate the total oil filling duration of the first preset stage. Among them, the preset minimum oil filling duration can be set according to the scenario needs. For example, the preset minimum oil filling duration can be 20 ms.

[0068] Among them, the method of calculating the total oil filling duration of the first preset stage according to the remaining oil filling percentage, the preset basic oil filling time, the oil filling time compensation value, the preset minimum oil filling duration, and the self-learning oil filling duration is different in different application scenarios. For example, in some possible embodiments, input the above-mentioned remaining oil filling percentage, the preset basic oil filling time, the oil filling time compensation value, the preset minimum oil filling duration, and the self-learning oil filling duration into a pre-trained oil filling duration calculation model, and obtain the total oil filling duration of the first preset stage output by the model; in some possible embodiments, the preset minimum oil filling duration is BoostMin, and the self-learning oil filling duration is tm_BoostAdptC. Then, first calculate the sum of the preset basic oil filling time and the oil filling time compensation value, update the preset basic oil filling time according to the sum value. Furthermore, based on the total oil filling duration of the first preset stage = ((100 - remaining oil filling percentage) × (preset basic oil filling time - BoostMin)) + BoostMin + tm_BoostAdptC, calculate the total oil filling duration of the first preset stage.

[0069] Furthermore, in this embodiment, it is monitored whether the oil filling duration in the first preset stage is greater than or equal to the total oil filling duration in the first preset stage. Wherein, when it is greater than or equal to the total oil filling duration in the first preset stage, it is determined that the end condition of the first preset stage is satisfied.

[0070] Step 204, when the end condition of the first preset stage is satisfied, control the fourth clutch to enter the second preset stage, wherein in the second preset stage, the control pressure of the fourth clutch is adjusted.

[0071] When the end condition of the first preset stage is satisfied, control the fourth clutch to enter the second preset stage, wherein in the second preset stage, the control pressure of the fourth clutch is adjusted, and in the second preset stage, the control pressure of the fourth clutch is further increased.

[0072] In an embodiment of the present disclosure, the fourth clutch can be directly controlled based on the preset pressure value in the second preset stage.

[0073] Or, In an embodiment of the present disclosure, the current temperature of the fourth clutch can be determined, and a first pressure compensation value can be obtained by querying a preset second table according to the current temperature of the fourth clutch. That is, in this embodiment, considering that when the current temperature of the clutch is relatively low, the hydraulic oil becomes more viscous and has poor fluidity. This means that under low-temperature conditions, the hydraulic oil flows through the valves and pipelines at a slower speed, resulting in an increase in the oil filling time and an extension of the time required to reach the target control pressure. When the current temperature of the clutch is relatively high, the hydraulic oil becomes thinner and has better fluidity. This enables the hydraulic oil to flow through the valves and pipelines faster, thereby shortening the oil filling time and increasing the speed of reaching the target control pressure. Therefore, the current temperature can have a certain impact on the control pressure.

[0074] In this embodiment, a first pressure compensation value is obtained by querying a preset second table according to the current temperature of the fourth clutch, wherein the second table can be calibrated according to the scenario. In some possible embodiments, the second table is shown in Table 2 below: Table 2

[0075] In this embodiment, the preset basic control pressure in the second preset stage can be calibrated in advance according to experimental data, etc. For example, the preset basic control pressure in the second preset stage can be 1.2 bar. In this embodiment, according to the preset basic control pressure and the first pressure compensation value of the fourth clutch in the second preset stage, the control pressure in the second preset stage is determined, wherein the control pressure in the second preset stage can be the sum of the preset basic control pressure and the first pressure compensation value in the second preset stage. Furthermore, in the second preset stage, the fourth clutch is controlled according to the control pressure in the second preset stage.

[0076] Step 205, in the second preset stage, monitor whether the fourth clutch meets the end condition of the second preset stage.

[0077] In this embodiment, in the second preset stage, monitor whether the fourth clutch meets the end condition of the second preset stage, so as to control the fourth clutch to enter the third preset stage after meeting the end condition of the second preset stage.

[0078] In some possible embodiments, it is possible to detect whether the control duration of the second preset stage is greater than the corresponding preset duration, and when it is greater than the corresponding preset duration, it is considered that the end condition of the second preset stage is met; or, In some possible embodiments, query a preset third table according to the current temperature of the fourth clutch to obtain the total control duration of the second preset stage, where the third table can be calibrated according to the experimental scenario. In some possible embodiments, the third table is shown in Table 3 below: Table 3

[0079] In this embodiment, determine whether the control duration of the second preset stage is greater than or equal to the total control duration of the second preset stage, where when it is greater than or equal to the total control duration of the second preset stage, it is determined that the end condition of the second preset stage is met.

[0080] In an embodiment of the present disclosure, in the second preset stage, when the vehicle shifts from neutral to forward gear, other clutches other than the fourth clutch such as the first clutch will close (it may be only the first clutch that closes, or the first clutch and the second clutch may close, etc., which can be specifically set according to the scenario). The closing of other clutches can ensure a quick response to the driver's driving needs. At this time, if the engagement process of other closed clutches is greater than NDBoost, that is, the engagement process of the closed clutch has passed the oil filling stage of the first preset stage, and the engagement process of the fourth clutch is less than NDHoldRamp, that is, the engagement process of the fourth clutch has not entered the holding stage of the clutch control pressure, then in order to shorten the engagement process of the fourth clutch, directly end the second preset stage.

[0081] Step 206, when the end condition of the second preset stage is met, control the fourth clutch to enter the third preset stage, where in the third preset stage, the control pressure of the fourth clutch is adjusted.

[0082] When the end condition of the second preset stage is met, control the fourth clutch to enter the third preset stage, where in the third preset stage, the control pressure of the fourth clutch is adjusted, that is, in the third preset stage, the control pressure of the fourth clutch is further increased.

[0083] In one embodiment of the present disclosure, in the third preset stage, the current throttle opening of the vehicle is obtained, and a preset fourth table is queried according to the current throttle opening of the vehicle to obtain a second pressure compensation value. That is, in this embodiment, considering that when the throttle opening is large, it indicates that the driver needs greater power to drive the vehicle, and at this time, the control pressure of the clutch will relatively increase. On the contrary, when the throttle opening is small, it indicates that the driver hopes to drive more smoothly, and at this time, the control pressure of the clutch will relatively decrease. Therefore, in this embodiment, a preset fourth table is queried according to the current throttle opening of the vehicle to obtain a second pressure compensation value.

[0084] Among them, the fourth table can be set according to the scenario. In some possible embodiments, the fourth table is shown in Table 4 below: Table 4

[0085] In this embodiment, the preset basic control pressure of the fourth clutch in the third preset stage is also obtained. Among them, the preset basic control pressure in the third preset stage can be set according to the scenario. The first reference control pressure is determined according to the preset basic control pressure of the fourth clutch in the third preset stage and the second pressure compensation value. Among them, the first reference control pressure can be the sum of the preset basic control pressure and the second pressure compensation value.

[0086] In this embodiment, a preset fifth table is queried according to the current throttle opening of the vehicle to obtain a pressure growth slope compensation value. That is, in this embodiment, considering that when the throttle opening is large, it indicates that the driver needs greater power to drive the vehicle, and at this time, the control pressure of the clutch will increase relatively quickly. On the contrary, when the throttle opening is small, it indicates that the driver hopes to drive more smoothly, and at this time, the control pressure of the clutch will decrease relatively slowly. Therefore, in this embodiment, a preset fifth table is queried according to the current throttle opening of the vehicle to obtain a pressure growth slope compensation value.

[0087] Among them, the preset fifth table can be set according to the scenario. In some possible embodiments, the fifth table is shown in Table 5 below: Table 5

[0088] In this embodiment, the first historical control pressure collected by the fourth clutch in the previous preset cycle is obtained, that is, the control pressure of the fourth clutch is collected according to the preset cycle, and the first historical control pressure collected in the previous preset cycle is obtained. Furthermore, the second reference control pressure is determined according to the pressure growth slope compensation value and the first historical control pressure. For example, the sum of the pressure growth slope compensation value and the first historical control pressure is used as the second reference control pressure, or the first historical control pressure * (1 + pressure growth slope compensation value) is used as the second reference control pressure.

[0089] Furthermore, in the third preset stage, the fourth clutch is controlled according to the minimum value of the first reference control pressure and the second reference control pressure. The purpose is to prevent the excessive pressure increase in the third preset stage from causing the clutch to be tightened too quickly and resulting in poor shift quality.

[0090] Step 207, in the third preset stage, monitor whether the fourth clutch meets the end condition of the third preset stage.

[0091] In the third preset stage, monitor whether the fourth clutch meets the end condition of the third preset stage, so as to control the fourth clutch to enter the fourth preset stage after meeting the end condition of the third preset stage.

[0092] Among them, in some possible embodiments, it is possible to detect whether the control duration of the third preset stage is greater than the preset control duration of the third preset stage, and when it is greater than the corresponding preset duration, it is determined that the end condition of the third preset stage is met; In some possible embodiments, in the third preset stage, when the vehicle shifts from neutral to forward gear, other clutches other than the first clutch to the fourth clutch will close. At this time, if the engagement process of other closed clutches is greater than NDKp, that is, the engagement process of the closed clutch has passed the Kp stage of the second preset stage, and the engagement process of the fourth clutch is less than NDHoldRamp, that is, the engagement process of the fourth clutch has not entered the holding stage of the clutch control pressure, then in order to shorten the engagement process of the fourth clutch, the third preset stage is directly ended.

[0093] In some possible embodiments, the preset sixth table is queried according to the current throttle opening of the vehicle to obtain the total control duration of the third preset stage, where the sixth table can be set according to the scenario. For example, the sixth table is as follows in Table 6: Table 6

[0094] Determine whether the control duration of the third preset stage is greater than or equal to the total control duration of the third preset stage, where when it is greater than or equal to the total control duration of the third preset stage, it is determined that the end condition of the third preset stage is met.

[0095] Step 208, when the end condition of the third preset stage is met, control the fourth clutch to enter the fourth preset stage, where in the fourth preset stage, the fourth clutch is subjected to a tightening control.

[0096] When the end condition of the third preset stage is met, control the fourth clutch to enter the fourth preset stage, where in the fourth preset stage, the fourth clutch is subjected to a tightening control. It is a control stage of gradually tightening based on a certain slope in the fourth preset stage.

[0097] In this embodiment, the current throttle opening of the vehicle can be obtained, and the preset seventh table is queried according to the current throttle opening of the vehicle to obtain the third pressure compensation value. Among them, the seventh table can be set according to the scenario. In some possible embodiments, the seventh table is shown in Table 7 below: Table 7

[0098] In the embodiment, the second historical control pressure collected by the fourth clutch in the previous preset period can be obtained, and the fourth clutch is controlled according to the sum of the third pressure compensation value and the second historical control pressure.

[0099] Step 209, in the fourth preset stage, monitor whether the fourth clutch meets the end condition of the fourth preset stage.

[0100] In the fourth preset stage, monitor whether the fourth clutch meets the end condition of the fourth preset stage.

[0101] In some possible embodiments, in the fourth preset stage, when the vehicle shifts from neutral to forward gear, other clutches other than the first clutch to the fourth clutch will close. At this time, if the engagement process of other closed clutches is greater than NDKp, that is, the engagement process of the closed clutch has passed the Kp stage of the second preset stage, and the engagement process of the fourth clutch is less than NDHoldRamp, that is, the engagement process of the fourth clutch has not entered the holding stage of the clutch control pressure, then in order to shorten the engagement process of the fourth clutch, the fourth preset stage is directly ended.

[0102] In some possible embodiments, the preset eighth table is queried according to the current throttle opening of the vehicle to obtain the total control duration of the fourth preset stage. Among them, the eighth table can be set according to the scenario. For example, the eighth table is shown in Table 8 below: Table 8

[0103] Step 2010, when the end condition of the fourth preset stage is met, control the fourth clutch to be in a closed state.

[0104] When the end condition of the fourth preset stage is met, control the fourth clutch to be in a closed state. At this time, the fourth clutch is locked. After entering the closed state, it can be explained that this clutch has changed based on the driver's driving intention for the whole vehicle and is no longer controlled to be in neutral or have a driving intention. Then the clutch normally enters the pressing control. Ensure that the clutch transmits torque normally after the fourth clutch is pressed.

[0105] It should be emphasized that the above Tables 1 to 8 are merely examples of tables. When querying Tables 1 and 8, if there is no corresponding parameter value in Tables 1 and 8, the value corresponding to the parameter closest to the query parameter is determined as the query result. For example, for Table 8, when the current throttle opening is 4, the duration corresponding to the closest throttle opening of 5 is used as the total control duration of the fourth preset stage. When the two closest parameters are involved, the average value of the values corresponding to the two parameters is used as the query result. For example, for Table 8, when the current throttle opening is 2.5, the average value of the durations corresponding to the closest throttle openings of 0 and 5 is used as the total control duration of the fourth preset stage.

[0106] In summary, for the clutch control method of an automatic transmission vehicle according to an embodiment of the present disclosure, after the fourth clutch is controlled to open, when it is recognized that the driver has a driving demand, another clutch controlled in neutral is quickly engaged in a timely manner, and according to the multi-stage control of the fourth clutch, the fourth clutch controlled in neutral coasting is quickly engaged in a timely manner, ensuring that the driver's driving demand is not affected. Moreover, when controlling the fourth clutch, according to the actual driving parameters of the current driver, the neutral coasting clutch can be quickly tightened, further ensuring that the clutch can be quickly engaged and preventing clutch slip and other synovial membrane failures.

[0107] To implement the above embodiment, the present disclosure also proposes a clutch control device for an automatic transmission vehicle. The vehicle includes a brake, a first clutch, a second clutch, a third clutch, and a fourth clutch. When the vehicle is in neutral, the brake and the fourth clutch are default in a closed state, wherein the fourth clutch transmits torque to the vehicle in the closed state, and the first clutch, the second clutch, and the third clutch are default in an open state.

[0108] Figure 3 FIG. is a schematic structural diagram of a clutch control device for an automatic transmission vehicle provided by an embodiment of the present disclosure. The device can be implemented by software and / or hardware and is generally integrated in the vehicle. As Figure 3 shown, the device includes: a detection module 310, a determination module 320, and a control module 330, wherein, The detection module 310 is configured to detect whether the vehicle is in a preset neutral coasting entry condition; The determination module 320 is configured to determine whether the vehicle meets a preset prohibited neutral coasting condition when in the preset neutral coasting entry condition, wherein the preset prohibited neutral coasting condition is used to prohibit the vehicle from neutral coasting; The control module 330 is configured to control the fourth clutch to switch from a closed state to an open state when the preset prohibited neutral coasting condition is met, wherein when the fourth clutch is in an open state, the vehicle does not perform neutral coasting.

[0109] The clutch control device for an automatic transmission vehicle provided by the embodiments of the present disclosure can execute the clutch control method for an automatic transmission vehicle provided by any embodiment of the present disclosure, and has the corresponding functional modules and beneficial effects for executing the method.

[0110] To implement the above embodiments, the present disclosure also proposes a computer program product, including a computer program / instructions, which when executed by a processor, implement the clutch control method for an automatic transmission vehicle in the above embodiments.

[0111] Figure 4 It is a schematic structural diagram of a vehicle provided by an embodiment of the present disclosure. Exemplarily, as Figure 4 shown, the vehicle 400 includes a memory 401 and a processor 402. Among them, the memory is used to store the executable instructions 4011 that can be executed by the processor, and the processor is used to read the executable instructions 4011 from the memory and execute the executable instructions to implement the above method.

[0112] In this embodiment, the vehicle can be divided into functional modules according to the above method examples. For example, it can correspond to each functional module, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is illustrative, only a logical function division, and there can be other division methods in actual implementation.

[0113] In the case of dividing each functional module corresponding to each function, the vehicle can include: a detection module, a determination module, a control module, etc. It should be noted that all relevant contents of each step involved in the above method embodiment can be cited in the function description of the corresponding functional module, and will not be repeated here.

[0114] The vehicle provided by this embodiment is used to execute the above-mentioned clutch control method for an automatic transmission vehicle, and thus can achieve the same effect as the above implementation method.

[0115] In the case of adopting an integrated unit, the vehicle can include a processing module and a storage module. Among them, the processing module can be used to control and manage the actions of the vehicle. The storage module can be used to support the vehicle to execute mutual program codes and data, etc.

[0116] Among them, the processing module can be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits described in connection with the present disclosure. The processor can also be a combination that implements computing functions, such as a combination including one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module can be a memory.

[0117] This embodiment also provides a computer-readable storage medium. Computer program code is stored in the computer-readable storage medium (including but not limited to disk memories, CD-ROMs, optical memories, etc.). When the computer program code runs on a computer, it causes the computer to execute the above-related method steps to implement a clutch control method for an automatic transmission vehicle provided in the above embodiment.

[0118] Among them, the beneficial effects of the above embodiment can refer to the beneficial effects in the corresponding method provided above, and will not be elaborated here.

[0119] Through the description of the above embodiments, those skilled in the art can understand that for the convenience and brevity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0120] In the embodiments provided by the present disclosure, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the coupling or direct coupling or communication connection shown or discussed with each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in electrical, mechanical or other forms. The above description is only the preferred embodiment of the present disclosure and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, but also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosure concept. For example, a technical solution formed by mutually replacing the above features with (but not limited to) technical features with similar functions disclosed in the present disclosure.

[0121] Moreover, although the operations are depicted in a particular order, this should not be construed as requiring that the operations be performed in the particular order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the foregoing discussion, these should not be construed as limitations on the scope of the present disclosure. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented separately or in any suitable sub-combination in multiple embodiments.

[0122] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

Claims

1. A clutch control method for an automatic transmission vehicle, characterized in that The vehicle includes a brake, a first clutch, a second clutch, a third clutch, and a fourth clutch. When the vehicle is in neutral, the brake and the fourth clutch are default in the closed state. Among them, the fourth clutch transmits torque to the vehicle in the closed state, and the first clutch, the second clutch, and the third clutch are default in the open state. The method includes: Detect whether the vehicle is in a preset neutral coasting entry condition; When in the preset neutral coasting entry condition, determine whether the vehicle meets the preset neutral coasting prohibition condition, where the preset neutral coasting prohibition condition is used to prohibit the vehicle from neutral coasting; When meeting the preset neutral coasting prohibition condition, control the fourth clutch to switch from the closed state to the open state. When the fourth clutch is in the open state, the vehicle does not perform neutral coasting.

2. The method according to claim 1, wherein The preset neutral coasting entry condition includes: The preset neutral coasting prohibition function switch of the vehicle is in a preset open state; and, The currently closed clutch of the vehicle is the fourth clutch; and, The position of the shift lever in the vehicle is in the neutral position; and The control gear of the automatic transmission is in neutral, or in the shifting process from other gears to neutral; and / or, When the vehicle is a four-wheel drive system, the four-wheel drive system is in a fixed four-wheel drive gear ratio.

3. The method according to claim 1, characterized in that, The preset neutral coasting prohibition condition includes: The vehicle is in the preset neutral coasting entry condition; and, The vehicle is in neutral; and, The preset braking device of the vehicle is in an unactivated state.

4. The method according to claim 1, wherein It further includes: Detect whether the vehicle meets the preset driving conditions; When meeting the preset driving conditions, control the fourth clutch to enter the first preset stage, where in the first preset stage, the fourth clutch is subjected to oil filling treatment; In the first preset stage, monitor whether the fourth clutch meets the end condition of the first preset stage; When meeting the end condition of the first preset stage, control the fourth clutch to enter the second preset stage, where in the second preset stage, the control pressure of the fourth clutch is adjusted; In the second preset stage, monitor whether the fourth clutch meets the end condition of the second preset stage; When meeting the end condition of the second preset stage, control the fourth clutch to enter the third preset stage, where in the third preset stage, the control pressure of the fourth clutch is adjusted; In the third preset stage, monitor whether the fourth clutch meets the end condition of the third preset stage; When meeting the end condition of the third preset stage, control the fourth clutch to enter the fourth preset stage, where in the fourth preset stage, the fourth clutch is subjected to clamping control; In the fourth preset stage, monitor whether the fourth clutch meets the end condition of the fourth preset stage; When meeting the end condition of the fourth preset stage, control the fourth clutch to be in the closed state.

5. The method according to claim 4, characterized in that, The controlling the fourth clutch to enter the first preset stage includes: Controlling the fourth clutch to fill with oil according to a preset pressure value; Monitoring whether the fourth clutch meets the first preset stage end condition includes: Determining the current temperature of the fourth clutch and querying a preset first table according to the current temperature of the fourth clutch to obtain an oil filling time compensation value; Obtaining the preset basic oil filling time and the remaining oil filling percentage of the fourth clutch, and obtaining the self-learning oil filling duration of the fourth clutch calculated in advance; Calculating the total oil filling duration of the first preset stage according to the remaining oil filling percentage, the preset basic oil filling time, the oil filling time compensation value, the preset minimum oil filling duration, and the self-learning oil filling duration; Monitoring whether the oil filling duration of the first preset stage is greater than or equal to the total oil filling duration of the first preset stage, wherein when it is greater than or equal to the total oil filling duration of the first preset stage, it is determined that the first preset stage end condition is met.

6. The method according to claim 4, wherein Controlling the fourth clutch to enter the second preset stage includes: Determining the current temperature of the fourth clutch and querying a preset second table according to the current temperature of the fourth clutch to obtain a first pressure compensation value; Determining the control pressure of the second preset stage according to the preset basic control pressure of the fourth clutch in the second preset stage and the first pressure compensation value; Controlling the fourth clutch according to the control pressure of the second preset stage; Monitoring whether the fourth clutch meets the second preset stage end condition includes: Querying a preset third table according to the current temperature of the fourth clutch to obtain the total control duration of the second preset stage; Determining whether the control duration of the second preset stage is greater than or equal to the total control duration of the second preset stage, wherein when it is greater than or equal to the total control duration of the second preset stage, it is determined that the second preset stage end condition is met.

7. The method according to claim 4, wherein Controlling the fourth clutch to enter the third preset stage includes: Obtaining the current throttle opening of the vehicle, querying a preset fourth table according to the current throttle opening of the vehicle to obtain a second pressure compensation value, and querying a preset fifth table according to the current throttle opening of the vehicle to obtain a pressure increase slope compensation value; Obtaining the first historical control pressure collected by the fourth clutch in the previous preset cycle; Determining a first reference control pressure according to the preset basic control pressure of the fourth clutch in the third preset stage and the second pressure compensation value; Determining a second reference control pressure according to the pressure increase slope compensation value and the first historical control pressure; Controlling the fourth clutch according to the minimum value of the first reference control pressure and the second reference control pressure; Monitoring whether the fourth clutch meets the third preset stage end condition includes: Querying a preset sixth table according to the current throttle opening of the vehicle to obtain the total control duration of the third preset stage; Determining whether the control duration of the third preset stage is greater than or equal to the total control duration of the third preset stage, wherein when it is greater than or equal to the total control duration of the third preset stage, it is determined that the third preset stage end condition is met.

8. The method according to claim 4, wherein Controlling the fourth clutch to enter the fourth preset stage includes: Obtaining the current throttle opening of the vehicle, and querying a preset seventh table according to the current throttle opening of the vehicle to obtain a third pressure compensation value; Obtaining the second historical control pressure collected by the fourth clutch in the previous preset cycle; Controlling the fourth clutch according to the sum of the third pressure compensation value and the second historical control pressure; Monitoring whether the fourth clutch meets the end condition of the fourth preset stage includes: Querying a preset eighth table according to the current throttle opening of the vehicle to obtain the total control duration of the fourth preset stage, Determining whether the control duration of the fourth preset stage is greater than or equal to the total control duration of the fourth preset stage, wherein when it is greater than or equal to the total control duration of the fourth preset stage, it is determined that the end condition of the fourth preset stage is met.

9. A clutch control device for an automatic transmission vehicle, characterized in that, The vehicle includes a brake, a first clutch, a second clutch, a third clutch, and a fourth clutch. When the vehicle is in neutral, the brake and the fourth clutch are default in the closed state. Among them, the fourth clutch transmits torque to the vehicle in the closed state, and the first clutch, the second clutch, and the third clutch are default in the open state. The device includes: A detection module for detecting whether the vehicle is in a preset neutral coasting entry working condition; A determination module for determining whether the vehicle meets a preset prohibited neutral coasting condition when in the preset neutral coasting entry working condition, wherein the preset prohibited neutral coasting condition is used to prohibit the vehicle from neutral coasting; A control module for controlling the fourth clutch to switch from the closed state to the open state when the preset prohibited neutral coasting condition is met. When the fourth clutch is in the open state, the vehicle does not perform neutral coasting.

10. A vehicle, characterized in that, The vehicle includes: A processor; A memory for storing executable instructions that can be executed by the processor; The processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the clutch control method for an automatic transmission vehicle according to any one of claims 1-8 above.

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