Vehicle transmission, control method thereof and vehicle

Abstract

The invention relates to a vehicle transmission, a control method thereof and a vehicle, and belongs to the technical field of electronics. The vehicle transmission comprises a clutch, an oil pump and a controller, wherein the oil pump is connected with the clutch; the controller is connected with the clutch and the oil pump, and the controller is used for judging whether the oil pump loses the pressure buildup capacity or not when the vehicle decelerates; and when the oil pump loses the pressure buildup capacity, the clutch is controlled to be in a separation state. Whether the oil pump loses the pressure buildup capacity or not is assessed, when the oil pump loses the pressure buildup capacity (including that the oil pump is about to lose the pressure buildup capacity), the clutch is controlled to be in the separation state, potential safety hazards and derivative faults caused by power transmission interruption can be reduced, then the driving safety is improved, and potential mechanical damage is reduced; and impact caused by sudden separation of the clutch due to insufficient oil pressure can be reduced, and the comfort of vehicle driving is improved.

Description

Technical Field

[0001] The present application belongs to the field of electronic technology, and specifically relates to a vehicle transmission, a control method thereof, and a vehicle. Background Art

[0002] There are many different clutch control methods for modern hybrid transmissions, such as solenoid valve control, brushless direct current motor (BLDC) push rod control, oil pump pressure building control, etc. Among them, the oil pump pressure building direct control clutch control method is widely used due to its advantages of low control cost and high efficiency. The control principle of the oil pump pressure building direct control clutch is: when the clutch needs to be engaged, the oil pump rotates forward, so that the oil in the oil pan is sucked out by the oil pump and injected into the clutch oil chamber; when the clutch needs to be disengaged, the oil pump reverses to discharge the oil in the clutch oil chamber into the oil pan. Among them, oil pump oil suction and pressure building are the basic requirements for realizing the clutch engagement function. Pressure building refers to the oil pump compressing the sucked oil to generate a certain pressure for the clutch to use. Under certain intense working conditions, it is difficult for the oil pump to fully absorb oil, so that it cannot build pressure. If the oil pump fails to build pressure at the time when pressure should be built, it will cause damage to the clutch, thereby endangering driving safety. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a vehicle transmission, a control method thereof and a vehicle, which, when it is judged that the oil pump has lost its pressure-building ability (including is about to lose its pressure-building ability), controls the clutch to be in a disengaged state, thereby reducing the occurrence of derivative failures, thereby reducing potential mechanical wear and improving driving safety.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a vehicle transmission, comprising a clutch, an oil pump and a controller; the oil pump is connected to the clutch; the controller is connected to the clutch and the oil pump, respectively, and the controller is used to determine whether the oil pump loses its pressure-building capability when the vehicle decelerates; and when the oil pump loses its pressure-building capability, control the clutch to be in a disengaged state.

[0006] In the above embodiment, when the vehicle is in a deceleration condition, the pressure building capacity of the oil pump is first evaluated. When it is determined that the oil pump has lost its pressure building capacity (including being about to lose its pressure building capacity), the controller controls the clutch in the transmission to be in a disengaged state, thereby reducing the occurrence of derivative failures such as damage to bearings, gears, and clutches, thereby reducing potential mechanical damage and improving driving safety.

[0007] In combination with a possible implementation manner of the first aspect, the controller is specifically used to determine whether the oil pump has lost its pressure building ability based on the vehicle's current deceleration and a preset target deceleration, wherein when the vehicle's current deceleration is less than the preset target deceleration, it is determined that the oil pump has lost its pressure building ability; the preset target deceleration is derived based on the relationship between the vehicle's deceleration and the oil pump's pressure building ability.

[0008] In the above embodiment, the present application can derive the target deceleration through the relationship between the vehicle's deceleration and the oil pump's pressure building capacity, and then by analyzing the difference between the vehicle's current deceleration and the preset target deceleration, it can be determined that the oil pump may have a pressure building problem, and measures can be taken in advance to reduce the occurrence of derivative failures, thereby helping to improve driving safety; and the vehicle's deceleration can be monitored in real time, and changes in the oil pump's pressure building capacity can be responded to in a timely manner.

[0009] In combination with a possible implementation manner of the first aspect, the controller is specifically used to determine whether the oil pump has lost its pressure building capability based on the operating state of the vehicle, the current deceleration of the vehicle, and a preset target deceleration, wherein the preset target deceleration is derived based on the relationship between the deceleration of the vehicle and the pressure building capability of the oil pump.

[0010] In the above embodiment, when judging whether the oil pump has lost its ability to build pressure (including whether it is about to lose its ability to build pressure), not only the current deceleration of the vehicle is considered, but also the current operating state of the vehicle. The operating state of the vehicle can provide more information to help more accurately judge the working condition of the oil pump, which helps to improve the accuracy of the judgment and thus improve driving safety.

[0011] In combination with a possible implementation manner of the first aspect, the operating state includes the state of the acceleration signal of the vehicle, the power-on status, and the braking status; the controller is specifically used to determine whether the acceleration signal of the vehicle is abnormal, whether the vehicle is in a powered-on status, whether the vehicle is in a braking status, and whether the current deceleration of the vehicle is less than the preset target deceleration within a preset time period; wherein, when the acceleration signal of the vehicle is normal, the vehicle is in a powered-on status, the vehicle is in a braking status, and the current deceleration of the vehicle is less than the preset target deceleration within the preset time period, it is determined that the oil pump has lost its pressure building ability.

[0012] In the above embodiment, the operating state of the vehicle includes at least one of the state of the vehicle's acceleration signal, the vehicle's power-on state, and the vehicle's braking state. By judging whether the vehicle's acceleration signal is abnormal within a preset time period, whether the vehicle is in a power-on state, whether the vehicle is in a braking state, and whether the vehicle's current deceleration is less than a preset target deceleration to judge whether the oil pump is about to lose its pressure-building ability, the accuracy of the judgment can be improved. That is, by real-time monitoring of the vehicle's key operating parameters, a more comprehensive perspective is provided for judging whether the oil pump has lost its pressure-building ability (including whether it is about to lose its pressure-building ability), helping to make more accurate judgments, which can reduce the occurrence of derivative failures, thereby reducing potential mechanical damage and improving driving safety.

[0013] In combination with a possible implementation manner of the first aspect, the controller is specifically used to send a clutch disengagement request to the vehicle controller when the clutch is in an engaged state and the communication between the controller and the vehicle controller is normal; and in response to a clutch disengagement command returned by the vehicle controller based on the clutch disengagement request, control the clutch to be in a disengaged state.

[0014] In the above embodiment, when the oil pump loses its pressure-building ability, if the clutch is in an engaged state at this time and the communication between the controller and the vehicle controller is normal, the controller needs to send a clutch disengagement request to the vehicle controller instead of directly controlling the clutch to be in a disengaged state. Through the communication between the controller and the vehicle controller, the vehicle controller can take other measures, such as adjusting the engine output, to maintain stable operation of the vehicle and improve driving safety; and controlling the clutch to be in a disengaged state can reduce safety hazards caused by interruption of power transmission when the oil pump's pressure-building ability decreases, and prevent possible mechanical damage.

[0015] In combination with a possible implementation manner of the first aspect, the controller is specifically used to directly control the clutch to be in a disengaged state when the clutch is in an engaged state and the communication between the controller and the vehicle controller is abnormal.

[0016] In the above embodiment, when the oil pump loses its pressure-building ability, if the clutch is in an engaged state and the communication between the controller and the vehicle controller is abnormal, the controller needs to directly control the clutch to be in a disengaged state. When the oil pump's pressure-building ability decreases, the safety hazards caused by power transmission interruption are reduced, driving safety is improved, and possible mechanical damage is prevented; and the impact caused by sudden separation of the clutch due to insufficient oil pressure can be reduced, thereby improving vehicle driving comfort.

[0017] In combination with a possible implementation manner of the first aspect, the controller is also used to send a notification to the vehicle controller to suspend sending the clutch engagement request when the clutch is in a disengaged state and the communication between the controller and the vehicle controller is normal, so that the vehicle controller suspends sending the clutch engagement request to the controller.

[0018] In the above embodiment, when the oil pump loses its ability to build pressure, if the clutch is in a disengaged state at this time and the communication between the controller and the vehicle controller is normal, the controller needs to send a notification to the vehicle controller to suspend sending the clutch engagement request. By notifying the vehicle controller in advance, the clutch engagement operation can be prevented when the oil pump's ability to build pressure is insufficient, thereby reducing possible power transmission problems and potential damage to the transmission system; and by sending a notification to the vehicle controller, the vehicle controller can coordinate other systems to adapt to the current working state to maintain stable operation of the vehicle and improve driving safety.

[0019] In combination with a possible implementation manner of the first aspect, the controller is also used to send a notification to the vehicle controller to resume sending the clutch engagement request when the oil pump resumes the pressure building capacity, so that the vehicle controller resumes sending the clutch engagement request to the controller.

[0020] In the above embodiment, notifying the vehicle controller can ensure that the clutch engagement request is synchronized with other systems and operations of the vehicle, such as engine management, transmission system, etc., so as to achieve a smoother engagement process; and by notifying the vehicle controller in advance, the vehicle can be prepared for clutch engagement, improve response speed, and reduce power transmission delays; in addition, ensuring that all conditions meet the engagement requirements before the clutch engages can reduce safety risks caused by improper clutch operation and improve driving safety.

[0021] In a second aspect, an embodiment of the present application provides a vehicle, comprising a vehicle controller and a vehicle transmission provided in accordance with the above-mentioned first aspect embodiment and / or any possible implementation method in combination with the first aspect embodiment, wherein the vehicle controller is connected to the transmission.

[0022] In a third aspect, an embodiment of the present application provides a method for controlling a vehicle transmission, the method comprising: when the vehicle decelerates, determining whether the oil pump in the transmission loses its pressure-building capability; when the oil pump in the transmission loses its pressure-building capability, controlling the clutch in the transmission to be in a disengaged state.

[0023] Other features and advantages of the present application will be described in the following description. The purpose and other advantages of the present application can be realized and obtained through the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. The above and other purposes, features and advantages of the present application will be more clearly shown in the drawings.

[0025] Figure 1 A schematic structural diagram of a vehicle transmission provided in an embodiment of the present application is shown.

[0026] Figure 2 A schematic diagram showing the relationship between vehicle deceleration and oil pump pressure building capacity provided in an embodiment of the present application is shown.

[0027] Figure 3 A schematic diagram showing the relationship between a vehicle deceleration and the time when an oil pump loses its pressure-building capability is provided in an embodiment of the present application.

[0028] Figure 4 A schematic diagram showing the principle of a vehicle transmission control method provided in an embodiment of the present application is shown.

[0029] Figure 5 A schematic flow chart of a method for controlling a vehicle transmission provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following embodiments can be used as examples to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the scope of protection of the present application. It will be appreciated by those skilled in the art that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other.

[0031] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. At the same time, in the description of this application, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the technical term "connection" may refer to a direct connection or an indirect connection through an intermediate medium.

[0033] An embodiment of the present application provides a vehicle transmission that can predict the pressure-building capacity of the oil pump when the vehicle is in a deceleration condition, and when the oil pump is about to lose its pressure-building capacity, control the clutch to be in a disengaged state, thereby reducing the occurrence of derivative failures, thereby reducing potential mechanical damage and improving driving safety.

[0034] Combined with Figure 1 The structural schematic diagram of a vehicle transmission illustrates the principle of a vehicle transmission provided in an embodiment of the present application.

[0035] like Figure 1 As shown, the vehicle transmission includes a clutch, an oil pump and a controller, wherein the oil pump is connected to the clutch; and the controller is connected to the clutch and the oil pump respectively.

[0036] The controller is used to determine whether the oil pump loses its ability to build pressure when the vehicle decelerates; and to control the clutch to be in a disengaged state when the oil pump loses its ability to build pressure.

[0037] Among them, the above-mentioned vehicle transmission is a dedicated hybrid transmission (Dedicated Hybrid Transmission, DHT). A dedicated hybrid transmission is a special gearbox designed for hybrid vehicles, which achieves efficient power output and energy recovery through the coordinated work of an electric motor and an internal combustion engine. This transmission is designed to improve the fuel efficiency and performance of hybrid vehicles while reducing emissions. The oil pump loses its pressure-building ability means that the oil pump cannot provide enough pressure oil to the clutch, so that the clutch cannot be normally engaged and power cannot be transmitted. In the embodiment of the present application, the oil pump loses its pressure-building ability includes the oil pump is about to lose its pressure-building ability. Clutch engagement refers to the engagement of the active disc of the clutch with the driven disc of the clutch. After the clutch is engaged, power can be transmitted from the vehicle's engine to the vehicle's wheels through the vehicle transmission. Clutch separation refers to the separation of the active disc of the clutch from the driven disc of the clutch.

[0038] When the controller determines whether the oil pump loses its pressure-building capability, it may make the determination based only on the vehicle's current deceleration and a preset target deceleration, or it may make the determination based on the vehicle's operating status, the vehicle's current deceleration, and a preset target deceleration.

[0039] In one possible implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on the current deceleration of the vehicle and the preset target deceleration; wherein, when the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump has lost its pressure-building capability; and when the current deceleration of the vehicle is greater than or equal to the preset target deceleration, it is determined that the oil pump has recovered its pressure-building capability. The oil pump's recovery of its pressure-building capability includes the oil pump's imminent recovery of its pressure-building capability.

[0040] In one implementation, when the vehicle's current deceleration is less than a preset target deceleration within a preset time period, it is determined that the oil pump has lost its pressure-building ability; when the vehicle's current deceleration is greater than or equal to the preset target deceleration within the preset time period, it is determined that the oil pump has recovered its pressure-building ability.

[0041] The preset target deceleration is based on the relationship between the vehicle's deceleration and the oil pump's pressure-building capacity (e.g. Figure 2 As shown in Figure 2As shown, the oil pump has different pressure-building capabilities under different decelerations. When the vehicle deceleration is lower than -4m / s^2, the oil pump's pressure-building capabilities begin to drop sharply. Therefore, the preset target deceleration in the embodiment of the present application can be set to -4m / s^2, but the target deceleration given in the embodiment of the present application is only exemplary and is not intended to limit the target deceleration. The preset target deceleration serves as a critical value. When the vehicle's deceleration is less than the preset target deceleration, the oil pump is about to lose its pressure-building capabilities; when the vehicle's deceleration is greater than or equal to the preset target deceleration, the oil pump is about to resume its pressure-building capabilities. The current deceleration of the above-mentioned vehicle is obtained by the controller through the vehicle's CAN (Controller Area Network) line. The CAN line is a vehicle-internal communication protocol used to connect various electronic control units in the vehicle.

[0042] The relationship between the vehicle's deceleration and the time it takes for the oil pump to lose its ability to build pressure (such as Figure 3 The data shown in Figure 1 are obtained by analyzing the data collected on the oil pump pressure building capacity under different decelerations. Figure 3 It can be seen that the shortest time from the start of acceleration to the failure of complete pressure build-up is 1s (i.e. Figure 3 It can be seen that when the vehicle speed is -10m / s^2, the time for the oil pump to lose its pressure-building ability is the shortest, which is 1s), which fully meets the time requirement for smooth clutch separation.

[0043] The preset time period must ensure that there will be no misjudgment due to a sudden change in the acquired signal (i.e., the conditions for determining whether the oil pump has lost its pressure-building capability will not change suddenly during this time period), and also ensure that the pressure-building capability can be accurately identified. The above time period can be set to 0.5s. The time period given in the embodiment of this application is only exemplary and is not intended to limit the time period.

[0044] In one possible implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on the vehicle's operating state, the vehicle's current deceleration, and a preset target deceleration.

[0045] Among them, when the vehicle is in a specific operating state and the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump loses the pressure-building ability; when any of the conditions that the vehicle is in a specific operating state and the current deceleration of the vehicle is less than the preset target deceleration is not satisfied, it is determined that the oil pump recovers the pressure-building ability. The vehicle being in a specific operating state includes at least one of the following states: the acceleration signal of the vehicle is normal, the vehicle is powered on, and the vehicle is in a braking state.

[0046] In one implementation, when the vehicle is in a specific operating state within a preset time period and the vehicle's current deceleration is less than a preset target deceleration, it is determined that the oil pump has lost its ability to build pressure; when any of the conditions that the vehicle is in a specific operating state within a preset time period and the vehicle's current deceleration is less than a preset target deceleration is not met, it is determined that the oil pump has restored its ability to build pressure.

[0047] The running state of the vehicle includes at least one of a state of an acceleration signal of the vehicle, a power-on state of the vehicle, and a braking state of the vehicle.

[0048] In one implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on a state of an acceleration signal of the vehicle, a current deceleration of the vehicle, and a preset target deceleration.

[0049] In one implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on the power-on status of the vehicle, the current deceleration of the vehicle, and a preset target deceleration.

[0050] In one implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on the braking condition of the vehicle, the current deceleration of the vehicle, and a preset target deceleration.

[0051] In one implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on a state of an acceleration signal of the vehicle, a power-on condition of the vehicle, a current deceleration of the vehicle, and a preset target deceleration.

[0052] In one implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on a state of an acceleration signal of the vehicle, a braking condition of the vehicle, a current deceleration of the vehicle, and a preset target deceleration.

[0053] In one implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on the vehicle's power-on status, the vehicle's braking status, the vehicle's current deceleration, and a preset target deceleration.

[0054] In one implementation, the controller is specifically used to determine whether the oil pump has lost its pressure-building ability based on the state of the vehicle's acceleration signal, the vehicle's power-on condition, the vehicle's braking condition, the vehicle's current deceleration, and a preset target deceleration.

[0055] The logic for determining whether the oil pump has lost its ability to build pressure in any of the above embodiments is the same as the logic for determining whether the oil pump has lost its ability to build pressure based on the state of the vehicle's acceleration signal, the vehicle's power-on condition, the vehicle's braking condition, the vehicle's current deceleration, and the preset target deceleration. The specific determination process may refer to the following embodiments.

[0056] In one implementation, the controller is specifically used to determine whether the acceleration signal of the vehicle is abnormal within a preset time period, whether the vehicle is in a powered-on state, whether the vehicle is in a braking state, and whether the current deceleration of the vehicle is less than a preset target deceleration;

[0057] Among them, when there is no abnormality in the acceleration signal of the vehicle within a preset time period, the vehicle is in a powered-on state, the vehicle is in a braking state, and the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump has lost its ability to build pressure; when any of the following conditions is not met: there is no abnormality in the acceleration signal of the vehicle within a preset time period, the vehicle is in a powered-on state, the vehicle is in a braking state, and the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump has restored its ability to build pressure.

[0058] In one implementation mode, when there is no abnormality in the acceleration signal of the vehicle, the vehicle is in the powered-on state, the vehicle is in the braking state, and the current deceleration of the vehicle is less than a preset target deceleration, it is determined that the oil pump has lost its ability to build pressure; when there is no abnormality in the acceleration signal of the vehicle, the vehicle is in the powered-on state, the vehicle is in the braking state, and the current deceleration of the vehicle is less than a preset target deceleration, any one of the following conditions is not met, it is determined that the oil pump has restored its ability to build pressure.

[0059] Among them, whether the vehicle acceleration signal is abnormal is determined by checking the physical value and signal value transmitted on the vehicle CAN line. The vehicle acceleration signal is a physical signal and is obtained through the vehicle CAN line. Physical signals usually appear in pairs, one represents the signal value and the other represents the signal validity. The vehicle's power-on status is an internal signal of the transmission controller and can be directly obtained. The vehicle's braking status is obtained by the controller through the vehicle CAN line.

[0060] In one possible implementation, the controller is specifically configured to send a clutch release request to the vehicle controller when the clutch is in an engaged state and the communication between the controller and the vehicle controller is normal; and in response to a clutch release command returned by the vehicle controller based on the clutch release request, control the clutch to be in a disengaged state. At this time, the oil pump loses its pressure-building capability.

[0061] In a possible implementation, the controller is specifically configured to directly control the clutch to be in a disengaged state when the clutch is in an engaged state and the communication between the controller and the vehicle controller is abnormal. At this time, the oil pump loses its pressure-building capability.

[0062] In a possible implementation, the controller is further configured to send a notification to the vehicle controller to suspend sending a clutch engagement request when the clutch is in a disengaged state and the communication between the controller and the vehicle controller is normal, so that the vehicle controller suspends sending a clutch engagement request to the controller. At this time, the oil pump loses its ability to build pressure.

[0063] In a possible implementation, the controller is further configured to control the clutch to remain in the disengaged state when the clutch is in the disengaged state and the communication between the controller and the vehicle controller is abnormal. At this time, the oil pump loses its pressure-building capability.

[0064] In one possible implementation, the controller is further configured to send a notification to the vehicle controller to resume sending a clutch engagement request when the oil pump resumes the pressure-building capability, so that the vehicle controller resumes sending a clutch engagement request to the controller. At this time, the clutch is in a disengaged state and the communication between the controller and the vehicle controller is normal.

[0065] In one possible implementation, the controller is also used to control the clutch to remain in a disengaged state when the oil pump recovers its pressure-building capacity, the clutch is in a disengaged state, and the communication between the controller and the vehicle controller is abnormal.

[0066] In a possible implementation manner, the control principle of the vehicle transmission can be as follows: Figure 4 As shown. Among them, Figure 4 The judgment sequence of determining whether the oil pump in the transmission has lost its pressure-building capability, determining whether the clutch in the transmission is in an engaged state, and determining whether the communication between the controller in the transmission and the vehicle controller is normal is merely exemplary and is not intended to limit the judgment sequence provided in the embodiments of the present application. In practice, it may be adjusted according to actual needs.

[0067] An embodiment of the present application provides a vehicle, which includes a vehicle controller and a vehicle transmission provided in an embodiment of the present application, and the vehicle controller is connected to the transmission.

[0068] In the embodiments of the present application, the vehicle may be a hybrid electric vehicle, such as a plug-in hybrid electric vehicle, an extended-range hybrid electric vehicle, a series hybrid electric vehicle, and the like.

[0069] The present application also provides a method for controlling a vehicle transmission. Figure 5 The present application provides a method for controlling a vehicle transmission, comprising the following steps:

[0070] S10: When the vehicle decelerates, determine whether the oil pump in the transmission loses its pressure-building capability.

[0071] Among them, when judging whether the oil pump in the transmission has lost its pressure-building ability, the judgment can be made only based on the vehicle's current deceleration and the preset target deceleration, or based on the vehicle's operating status, the vehicle's current deceleration, and the preset target deceleration.

[0072] In one possible implementation, determining whether the oil pump in the transmission has lost its ability to build pressure includes determining whether the oil pump in the transmission has lost its ability to build pressure based on a current deceleration of the vehicle and a preset target deceleration.

[0073] Among them, when the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump loses the pressure building capacity; the preset target deceleration is obtained according to the relationship between the deceleration of the vehicle and the pressure building capacity of the oil pump.

[0074] In one possible implementation, determining whether the oil pump in the transmission has lost its ability to build pressure includes: determining whether the oil pump has lost its ability to build pressure based on the operating state of the vehicle, the current deceleration of the vehicle, and a preset target deceleration; wherein, when the vehicle is in a specific operating state and the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump has lost its ability to build pressure.

[0075] The running state of the vehicle includes at least one of a state of an acceleration signal of the vehicle, a power-on state of the vehicle, and a braking state of the vehicle.

[0076] In one possible implementation, determining whether the oil pump in the transmission has lost its pressure-building capability includes: determining whether an acceleration signal of the vehicle is abnormal within a preset time period, whether the vehicle is in a powered-on state, whether the vehicle is in a braking state, and determining whether a current deceleration of the vehicle is less than a preset target deceleration;

[0077] Among them, when there is no abnormality in the acceleration signal of the vehicle within a preset time period, the vehicle is in a powered-on state, the vehicle is in a braking state, and the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump has lost its ability to build pressure; when any of the following conditions is not met: there is no abnormality in the acceleration signal of the vehicle within a preset time period, the vehicle is in a powered-on state, the vehicle is in a braking state, and the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump has restored its ability to build pressure.

[0078] S20: When the oil pump in the transmission loses its pressure-building capability, the clutch in the transmission is controlled to be in a disengaged state.

[0079] In one possible implementation, controlling a clutch in a transmission to be in a disengaged state includes: sending a clutch disengagement request to the vehicle controller when the clutch is in an engaged state and communication between the controller and the vehicle controller is normal; and controlling the clutch to be in a disengaged state in response to a clutch disengagement command returned by the vehicle controller based on the clutch disengagement request.

[0080] In one possible implementation, controlling a clutch in a transmission to be in a disengaged state includes: when the clutch is in an engaged state and communication between the controller and the vehicle controller is abnormal, directly controlling the clutch to be in a disengaged state.

[0081] In one possible implementation, controlling the clutch in the transmission to be in a disengaged state includes: when the clutch is in a disengaged state and the communication between the controller and the vehicle controller is normal, sending a notification to the vehicle controller to suspend sending clutch engagement requests, so that the vehicle controller suspends sending clutch engagement requests to the controller.

[0082] In one possible implementation, controlling a clutch in a transmission to be in a disengaged state includes: when the clutch is in a disengaged state and communication between the controller and the vehicle controller is abnormal, controlling the clutch to remain in a disengaged state.

[0083] In one possible implementation, the control method of a vehicle transmission also includes: when the oil pump resumes its pressure building capacity, the clutch is in a disengaged state, and the communication between the controller and the vehicle controller is normal, sending a notification to the vehicle controller to resume sending a clutch engagement request, so that the vehicle controller resumes sending a clutch engagement request to the controller.

[0084] In one possible implementation, the vehicle transmission control method further includes: controlling the clutch to remain in a disengaged state when the oil pump recovers its pressure-building capacity, the clutch is in a disengaged state, and communication between the controller and the vehicle controller is abnormal.

[0085] The control method of the vehicle transmission provided in the embodiment of the present application has the same implementation principle and technical effects as those of the aforementioned vehicle transmission embodiment. For the sake of brief description, for matters not mentioned in the method embodiment, reference may be made to the corresponding contents in the aforementioned vehicle transmission embodiment.

[0086] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0087] In the several embodiments provided in the present application, it should be understood that the disclosed method can also be implemented in other ways. It should be noted that in some alternative implementations, the functions marked in the blocks can also occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved.

[0088] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0089] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A vehicle transmission, characterized in that: The vehicle transmission comprises: clutch; an oil pump connected to the clutch; A controller is connected to the clutch and the oil pump respectively. The controller is used to determine whether the oil pump loses its pressure-building capability when the vehicle decelerates; and when the oil pump loses its pressure-building capability, control the clutch to be in a disengaged state.

2. The vehicle transmission according to claim 1, characterized in that: The controller is specifically used to determine whether the oil pump has lost its pressure-building ability based on the current deceleration of the vehicle and a preset target deceleration, wherein when the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump has lost its pressure-building ability; the preset target deceleration is obtained based on the relationship between the deceleration of the vehicle and the pressure-building ability of the oil pump.

3. The vehicle transmission according to claim 1, characterized in that: The controller is specifically used to determine whether the oil pump has lost its pressure-building capability based on the operating state of the vehicle, the current deceleration of the vehicle, and a preset target deceleration, wherein the preset target deceleration is obtained based on the relationship between the deceleration of the vehicle and the pressure-building capability of the oil pump.

4. The vehicle transmission according to claim 3, characterized in that: The running state includes the state of the acceleration signal of the vehicle, the power-on state, and the braking state; the controller is specifically used to determine whether the acceleration signal of the vehicle is abnormal, whether the vehicle is in the power-on state, whether the vehicle is in the braking state, and whether the current deceleration of the vehicle is less than the preset target deceleration within a preset time period; Among them, when there is no abnormality in the acceleration signal of the vehicle within the preset time period, the vehicle is in a powered-on state, the vehicle is in a braking state, and the current deceleration of the vehicle is less than the preset target deceleration, it is determined that the oil pump has lost its pressure building ability.

5. The vehicle transmission according to claim 1, characterized in that: The controller is specifically used to send a clutch disengagement request to the vehicle controller when the clutch is in an engaged state and the communication between the controller and the vehicle controller is normal; and to control the clutch to be in a disengaged state in response to a clutch disengagement command returned by the vehicle controller based on the clutch disengagement request.

6. The vehicle transmission according to claim 1, characterized in that: The controller is specifically used to directly control the clutch to be in a disengaged state when the clutch is in an engaged state and the communication between the controller and a vehicle controller is abnormal.

7. The vehicle transmission according to claim 1, characterized in that: The controller is also used to send a notification to the vehicle controller to suspend sending the clutch engagement request when the clutch is in a disengaged state and the communication between the controller and the vehicle controller is normal, so that the vehicle controller suspends sending the clutch engagement request to the controller.

8. The vehicle transmission according to claim 7, characterized in that: The controller is further configured to send a notification to the vehicle controller to resume sending the clutch engagement request when the oil pump recovers its pressure-building capability, so that the vehicle controller resumes sending the clutch engagement request to the controller.

9. A vehicle, characterized in that: It comprises a vehicle controller and a vehicle transmission as claimed in any one of claims 1 to 8, wherein the vehicle controller is connected to the transmission.

10. A method for controlling a vehicle transmission, characterized in that: The method comprises: When the vehicle decelerates, determining whether the oil pump in the transmission loses its pressure-building capability; When the oil pump in the transmission loses its pressure-building capability, the clutch in the transmission is controlled to be in a disengaged state.

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