Control method of vehicle hydraulic system, vehicle starting control method, gearbox and vehicle

Abstract

The invention provides a control method of a vehicle hydraulic system, a vehicle starting control method, a gearbox and a vehicle. The control method of the vehicle hydraulic system is applied to a power assembly of a vehicle, the power assembly comprises the hydraulic system, the hydraulic system comprises an oil pump and an electromagnetic valve, and the electromagnetic valve is used for controlling hydraulic oil output by the oil pump to communicate with the high-pressure end or the low-pressure end of the hydraulic system; the method comprises the steps that in response to unlocking operation of a vehicle, the first oil temperature of an oil pump is obtained; detecting whether the first oil temperature is smaller than a preset oil temperature threshold value or not; and under the condition that the first oil temperature is detected to be smaller than the preset oil temperature threshold value, the electromagnetic valve is controlled to be opened, hydraulic oil output by the high-pressure end of the oil pump communicates with the low-pressure end of the hydraulic system, and the oil pump operates at the rotating speed lower than normal operation. The problem that when the temperature of the environment where the vehicle is located is low, the oil pump needs to operate at large output power when the vehicle is started, and the service life of the oil pump is short can be solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a control method for a vehicle hydraulic system, a vehicle startup control method, a gearbox and a vehicle. Background Art

[0002] When the vehicle is in a low ambient temperature, the drop in temperature will cause the viscosity of the hydraulic oil in the oil pump in the vehicle's gearbox to increase and the resistance of the gearbox's hydraulic system to increase. At this time, if the vehicle is to be started, not only will it be difficult to start the oil pump, but it will also require the oil pump to operate at a higher output power, resulting in a shorter service life of the oil pump. Summary of the invention

[0003] In view of the above, the embodiments of the present application provide a vehicle hydraulic system control method, a vehicle starting control method, a gearbox and a vehicle, which can solve the problem of short service life of the oil pump when the oil pump needs to run with a larger output power when starting the vehicle when the ambient temperature of the vehicle is low.

[0004] In a first aspect, the present application discloses a control method for a vehicle hydraulic system, the method being applied to a powertrain of a vehicle, the powertrain comprising a hydraulic system, the hydraulic system comprising an oil pump and a solenoid valve, the solenoid valve being used to control the hydraulic oil output by the oil pump to be connected to the high-pressure end or the low-pressure end of the hydraulic system; the method comprising: in response to an unlocking operation of the vehicle, obtaining a first oil temperature of the oil pump; detecting whether the first oil temperature is less than a preset oil temperature threshold; and when detecting that the first oil temperature is less than the preset oil temperature threshold, controlling the solenoid valve to open, the hydraulic oil output by the high-pressure end of the oil pump to be connected to the low-pressure end of the hydraulic system, and the oil pump operating at a speed lower than normal operation.

[0005] Compared with the related art, the embodiments of the present application have at least the following advantages: In response to the unlocking operation of the vehicle and by detecting that the first oil pump of the oil pump is less than the preset oil temperature threshold, the solenoid valve is controlled to open in advance and the oil pump is operated at a speed lower than the normal operation to output hydraulic oil. Before the vehicle is ignited and started, the oil pump can output hydraulic oil in advance to lubricate the components in the gearbox. Since the components in the gearbox are lubricated with hydraulic oil in advance before the ignition is started, when the ambient temperature of the vehicle is low, the oil pump can be operated with a smaller output power when the vehicle is ignited and started, which can meet the normal operation of the gearbox, thereby increasing the service life of the oil pump and ensuring the stable operation of the gearbox.

[0006] In some possible implementations, after the solenoid valve is controlled to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed lower than normal operation, it also includes: obtaining the speed of the oil pump; detecting whether the speed is greater than or equal to a preset speed; and when it is detected that the speed is greater than or equal to the preset speed, controlling the solenoid valve to close after a preset time.

[0007] In some possible implementations, the oil pump includes a first pump body and a second pump body; obtaining the rotational speed of the oil pump includes: obtaining a first rotational speed of the first pump body and a second rotational speed of the second pump body; detecting whether the rotational speed is greater than or equal to a preset rotational speed includes: detecting whether the first rotational speed is greater than or equal to the preset rotational speed and whether the second rotational speed is greater than or equal to the preset rotational speed; in the case of detecting that the rotational speed is greater than or equal to the preset rotational speed, controlling the solenoid valve to close after a preset time period includes: in the case of detecting that the first rotational speed and the second rotational speed are both greater than or equal to the preset rotational speed, controlling the solenoid valve to close after the preset time period.

[0008] In some possible implementations, the hydraulic system further includes an accumulator, which is used to adjust the pressure in the hydraulic system; after controlling the solenoid valve to close after a preset time, it also includes: adjusting the output pressure of the accumulator to within a preset pressure range.

[0009] In some possible implementations, after adjusting the output pressure of the accumulator to within a preset pressure range, it also includes: obtaining a second oil temperature of the oil pump; detecting whether the second oil temperature is less than the preset oil temperature threshold; when it is detected that the second oil temperature is not less than the preset oil temperature threshold, controlling the solenoid valve to open, so that the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed not lower than normal operation.

[0010] In some possible implementations, the oil pump includes a first pump body and a second pump body; obtaining the second oil temperature of the oil pump includes: respectively obtaining the first temperature of the first pump body and the second temperature of the second pump body; detecting whether the second oil temperature is less than the preset oil temperature threshold includes: respectively detecting whether the first temperature is less than the preset oil temperature threshold, and detecting whether the second temperature is less than the preset oil temperature threshold; when it is detected that the second oil temperature is not less than the preset oil temperature threshold, controlling the solenoid valve to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed not lower than normal operation, including: when it is detected that one or both of the first temperature and the second temperature are not less than the preset oil temperature threshold, controlling the solenoid valve to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed not lower than normal operation.

[0011] In some possible implementations, the oil pump includes a first pump body and a second pump body; obtaining the first oil temperature of the oil pump includes: respectively obtaining a third temperature of the first pump body and a fourth temperature of the second pump body; detecting whether the first oil temperature is less than a preset oil temperature threshold includes: respectively detecting whether the third temperature is less than the preset oil temperature threshold, and detecting whether the fourth temperature is less than the preset oil temperature threshold; when it is detected that the first oil temperature is less than the preset oil temperature threshold, controlling the solenoid valve to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed lower than normal operation, including: when it is detected that one or both of the third temperature and the fourth temperature are less than the preset oil temperature threshold, controlling the solenoid valve to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed lower than normal operation.

[0012] A second aspect of the present application discloses a vehicle starting control method, which is applied to a vehicle, wherein the vehicle includes a gearbox and an engine, the gearbox is used to adjust the output power of the engine, the gearbox includes a hydraulic system, the hydraulic system includes an oil pump and a solenoid valve, and the solenoid valve is used to control the hydraulic oil output by the oil pump to be connected to the high-pressure end or the low-pressure end of the hydraulic system; the method includes: in response to an unlocking request, receiving a first oil temperature of the oil pump; detecting whether the first oil temperature is less than a preset oil temperature threshold; when it is detected that the first oil temperature is less than the preset oil temperature threshold, controlling the solenoid valve to open, the hydraulic oil output by the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump runs at a speed lower than normal operation; in response to an ignition start request, starting the engine.

[0013] The third aspect of the present application discloses a gearbox, which includes a hydraulic system, a processor and a memory. The hydraulic system includes an oil pump and a solenoid valve. The solenoid valve is used to control the hydraulic oil output by the oil pump to be connected to the high-pressure end or the low-pressure end of the hydraulic system. The memory is used to store instructions, and the processor is used to call the instructions in the memory so that the gearbox executes the vehicle hydraulic system control method described in the first aspect.

[0014] A fourth aspect of the present application discloses a vehicle, comprising the gearbox and the engine as described in the third aspect, wherein the gearbox is used to adjust the output power of the engine.

[0015] It can be understood that the vehicle starting control method of the second aspect, the gearbox of the third aspect and the vehicle of the fourth aspect provided above all correspond to the method of the first aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a simple structural diagram of a hydraulic system according to an embodiment of the present application.

[0017] Figure 2 This is a simple structural schematic diagram of an oil pump according to an embodiment of the present application.

[0018] Figure 3 A schematic flow chart of a method for controlling a vehicle hydraulic system according to an embodiment of the present application.

[0019] Figure 4 Another flowchart diagram of a method for controlling a vehicle hydraulic system according to an embodiment of the present application.

[0020] Figure 5 This is a schematic diagram of the operation process of the accumulator, oil pump and solenoid valve according to an embodiment of the present application.

[0021] Figure 6 This is a schematic diagram of the operating speed of the oil pump and the operating power of the motor driving the oil pump according to an embodiment of the present application.

[0022] Description of main component symbols: Controller wiring harness, 1; oil pump rotor, 2; oil pump inlet, 3; main oil pressure outlet, 4; lubricating oil circuit outlet, 5.

[0023] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] It should be further noted that, in this article, the terms "comprises", "includes" or any other variations 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 includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0027] In this application, "at least one" means one or more, and "more" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0028] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0029] like Figure 1As shown, the hydraulic system of the vehicle is applied to the powertrain of the vehicle. The powertrain includes a hydraulic system. The hydraulic system includes an oil pump and a solenoid valve. The solenoid valve is used to control the oil pump to output hydraulic oil to the high-pressure end or the low-pressure end of the hydraulic system. The transmission system is the core component of the powertrain and is mainly responsible for transmitting the vehicle power source to the drive wheels. The transmission system includes a clutch, which can automatically switch gears or connect or disconnect power output according to the speed and driving conditions of the vehicle. The transmission system usually includes components such as an input shaft, an output shaft, a gear set and a clutch. The transmission ratio is changed by changing the combination of gears, thereby controlling the speed and power output of the vehicle. The hydraulic system also includes an accumulator, which is used to adjust the pressure in the hydraulic system.

[0030] The processor includes an electronic control system and a hydraulic control system. The electronic control system monitors the overall operating conditions of the vehicle to control different functions of the powertrain. The hydraulic control system is responsible for adjusting the pressure oil output by the oil pump to different pressures and delivering it to different parts to achieve different hydraulic control purposes.

[0031] The hydraulic system is mainly responsible for providing hydraulic oil to the gearbox within the powertrain and regulating its pressure. The hydraulic oil circulates in the system to provide the required hydraulic power to the various components of the gearbox. The stable operation of the hydraulic system is essential for the normal operation of the gearbox.

[0032] Please refer to Figure 2 The oil pump includes a controller harness 1, an oil pump rotor 2, an oil pump inlet 3, a main oil pressure outlet 4 and a lubricating oil circuit outlet 5. Among them, the controller harness 1 is used to connect the hydraulic control system and the oil pump. The oil pump rotor 2 is used to circulate the hydraulic oil in the system. The oil pump inlet 3 is mainly used to add hydraulic oil to the oil pump. The main function of the main oil pressure outlet 4 is to provide the required main oil pressure for the system to ensure that all components of the system can work normally. In the hydraulic system, the main oil pressure is the power source for driving various actuators (such as hydraulic cylinders, hydraulic motors, etc.) to ensure the normal operation and load capacity of the system. The main function of the lubricating oil circuit outlet 5 is to provide lubricating oil for moving parts such as bearings and gears in the system to reduce friction and wear and extend the service life of the equipment. The flow of lubricating oil can ensure that these components will not be damaged due to overheating when running at high speed, and ensure the stability and reliability of the equipment.

[0033] When the vehicle is in a low ambient temperature, the drop in temperature will cause the viscosity of the hydraulic oil in the oil pump in the vehicle's gearbox to increase and the resistance of the hydraulic system to increase. At this time, if the vehicle is to be started, not only will it be difficult to start the oil pump, but it will also require the oil pump to operate at a higher output power, resulting in a shorter service life of the oil pump.

[0034] To solve the above problems, please refer to Figure 3, the embodiment of the present application provides a control method for a vehicle hydraulic system. The control method for a vehicle hydraulic system is applied to a vehicle powertrain, and specifically, the control method for a vehicle hydraulic system is applied to a processor of a gearbox. The vehicle may be a fuel vehicle or a new energy vehicle, and the present application does not limit the specific type of the vehicle.

[0035] The control method of the vehicle hydraulic system comprises the following steps: Step 101: In response to an unlocking operation of a vehicle, obtain a first oil temperature of an oil pump.

[0036] In some embodiments, there are multiple ways to unlock the vehicle, such as starting the vehicle with a key, starting the vehicle remotely, approaching the key, etc. When the user needs to unlock the vehicle, the gearbox responds to the unlocking operation of the vehicle and obtains the first oil temperature of the oil pump. At this time, the vehicle is in an unlocked state. In this embodiment, the vehicle is in an unlocked state means that the door of the vehicle is open, and the user can open the door to enter and exit the vehicle.

[0037] In one embodiment, a temperature sensor may be provided on the periphery of the oil pump, and the temperature sensor is used to collect the first oil temperature of the oil pump in real time.

[0038] In another embodiment, temperature sensors may be provided at both the inlet and outlet of the oil pump to collect the temperature of the oil pump inlet and the temperature of the oil pump outlet, respectively. Then, the first oil temperature of the oil pump is estimated by combining the oil output, heat loss coefficient, and liquid specific heat capacity of the oil pump. This application does not limit the method for obtaining the first oil temperature.

[0039] In this embodiment, the oil pump is an electronic double pump, which refers to a hydraulic pump with two pump bodies, generally driven by a motor. The electronic double pump provides the required hydraulic oil for each space of the transmission system, thereby ensuring the normal operation of the transmission system shifting. In this embodiment, the transmission system can be a transmission.

[0040] Please combine again Figure 2 The electronic double pump consists of two oil circuits, one is the main oil pressure outlet 4, and the other is the lubricating oil outlet 5. The functions of the main oil pressure outlet 4 and the lubricating oil outlet 5 have been described above and will not be repeated here.

[0041] Further, the oil pump includes a first pump body and a second pump body. At this time, it is necessary to obtain the third temperature of the first pump body and the fourth temperature of the second pump body respectively.

[0042] Step 102: Detect whether the first oil temperature is less than a preset oil temperature threshold.

[0043] In this embodiment, it is necessary to detect whether the first oil temperature is less than a preset oil temperature threshold to determine whether the oil temperature of the hydraulic oil in the oil pump is low. The preset oil temperature threshold can be set to -10°C, -15°C or -20°C. The preset oil temperature threshold is determined according to the actual detection situation, and this application does not limit the specific value of the preset oil temperature threshold.

[0044] Specifically, it is respectively detected whether the third temperature is less than a preset oil temperature threshold, and it is detected whether the fourth temperature is less than a preset oil temperature threshold.

[0045] Step 103: When it is detected that the first oil temperature is lower than a preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump runs at a speed lower than normal operation.

[0046] In this embodiment, when it is detected that the first oil temperature is less than the preset oil temperature threshold, it proves that the oil temperature of the hydraulic oil in the oil pump is low at this time, and there may be situations such as increased viscosity of the hydraulic oil and increased resistance of the hydraulic system. In order to solve the problem in the prior art that when the hydraulic oil temperature in the oil pump is low, the oil pump needs to run at a large output power when the vehicle is ignited and started, resulting in a short service life of the oil pump and difficulty in starting the oil pump, when it is detected that one or both of the third temperature and the fourth temperature are less than the preset oil temperature threshold, the solenoid valve is controlled to open, and the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump runs at a speed lower than normal operation. Thereby, the oil pump outputs hydraulic oil to lubricate the transmission.

[0047] Compared with the related art, the embodiments of the present application have at least the following advantages: When the vehicle is in an unlocked state and the first oil pump of the oil pump is detected to be less than the preset oil temperature threshold, the solenoid valve is controlled to open in advance and the oil pump is operated at a speed lower than the normal operation to output hydraulic oil. Before the vehicle is ignited and started, the oil pump first outputs hydraulic oil to lubricate the components in the gearbox. On the one hand, by reducing the speed of the oil pump, the power demand when the oil pump is started can be reduced; on the other hand, when the vehicle is in an unlocked state, the oil pump is started in advance by making full use of the time before the vehicle is ignited and started, and the oil pump is maintained to run at a low speed. By increasing the running time of the oil pump, the predetermined amount of lubricating oil is gradually accumulated, thereby avoiding the impact of high-power starting on the oil pump. In this way, the problems of the prior art that the oil pump needs to run at a larger output power when the vehicle is ignited and started and the oil pump is difficult to start are solved.

[0048] See also Figure 4 , Figure 4Another flow chart of the control method of the vehicle hydraulic system provided in the embodiment of the present application. This embodiment is a further processing measure after executing step 103. The specific steps include: Step 201, obtaining the rotation speed of the oil pump, and detecting whether the rotation speed is greater than or equal to a preset rotation speed.

[0049] The oil pump speed is detected to determine whether the oil pump is running stably. When the oil pump includes a first pump body and a second pump body, a first speed of the first pump body and a second speed of the second pump body are obtained. It is detected whether the first speed is greater than or equal to a preset speed and whether the second speed is greater than or equal to a preset speed.

[0050] Step 202: When it is detected that the rotation speed is greater than or equal to the preset rotation speed, the solenoid valve is controlled to close after a preset time.

[0051] In this embodiment, when the speed is detected to be greater than or equal to the preset speed, it indicates that the oil pump is in a stable operation state. The preset speed may be 350 rpm or 400 rpm, and the preset duration may be 2 seconds or 3 seconds. The present application does not limit the specific values ​​of the preset speed and the preset duration, and the specific values ​​of the preset speed and the preset duration may be adjusted according to actual detection requirements.

[0052] Specifically, when it is detected that the first speed and the second speed are both greater than or equal to the preset speed, the solenoid valve is controlled to close after a preset time.

[0053] The speed of the oil pump is controlled to be greater than or equal to the preset speed, and the solenoid valve is controlled to close after a preset time, so as to stabilize the output power of the oil pump. At the same time, it can also prevent the gearbox from shaking.

[0054] It should be noted that at this time, the oil pump has been running stably for a period of time, and the oil pump has output part of the hydraulic oil to lubricate the transmission. When the ignition start command is received, the engine can be started to put the vehicle in a running state.

[0055] In one embodiment, the output pressure of the accumulator is adjusted to a preset pressure range, wherein the preset pressure range may be 35 bar to 45 bar, or 30 bar to 50 bar, etc., and the preset pressure range may be set according to actual needs.

[0056] Please combine Figure 5 , Figure 5 The working process of the solenoid valve, oil pump and accumulator is demonstrated. Figure 5It can be seen that when the first oil temperature is detected to be lower than the preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump runs at a speed lower than the normal operation. After the oil pump speed stabilizes, the solenoid valve is closed and starts to deliver hydraulic oil to the accumulator. At this time, the output pressure of the accumulator is within the preset pressure range. This cycle can ensure the stable operation of the gearbox.

[0057] By adjusting the output pressure of the accumulator, the load in the hydraulic system can be reduced, so that when the oil pump needs to be started again later, the output power of the oil pump can be reduced, thereby further reducing the energy consumption of starting the oil pump.

[0058] Step 203: Obtain a second oil temperature of the oil pump, and detect whether the second oil temperature is less than a preset oil temperature threshold.

[0059] By detecting the second oil temperature, it is determined whether the oil temperature in the oil pump rises again after the oil pump has been stable for a period of time.

[0060] Step 204: When it is detected that the second oil temperature is not less than the preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump runs at a speed not lower than normal operation.

[0061] When it is detected that the second oil temperature is not less than the preset oil temperature threshold, it indicates that after the oil pump has been running stably for a period of time, the oil temperature of the hydraulic oil in the oil pump has risen. At this time, the output power of the oil pump can be increased to output more hydraulic oil.

[0062] Wherein, when the oil pump includes a first pump body and a second pump body, a first temperature of the first pump body and a second temperature of the second pump body are obtained respectively. Then, it is detected whether the first temperature is less than a preset oil temperature threshold, and it is detected whether the second temperature is less than a preset oil temperature threshold. Finally, when it is detected that one or both of the first temperature and the second temperature are not less than the preset oil temperature threshold, the solenoid valve is controlled to open and the oil pump is operated at a speed not lower than the normal operation to output hydraulic oil.

[0063] Under normal circumstances, the starting speed of the oil pump is 1000rpm. In a low temperature environment, in order to meet the driver's demand for rapid vehicle response, if the oil pump runs at a higher required speed, the power of the motor driving the oil pump will increase by 2 times. By adopting the method of this embodiment, the starting speed of the oil pump and the operating power of the motor can be reduced. Figure 6 As shown, this embodiment can reduce the speed of the oil pump to 350 rpm, and the operating power of the motor is maintained between 20 W and 30 W. Thus, the service life of the oil pump and the motor is increased, and at the same time, the stable operation of the gearbox is ensured.

[0064] Compared with the related art, the embodiments of the present application have at least the following advantages: After the oil pump outputs hydraulic oil to lubricate the transmission, on the one hand, the oil pump is controlled to run at a speed greater than or equal to the preset speed for a preset time, and then the solenoid valve is controlled to close, so as to avoid the transmission from shaking; on the other hand, when it is detected that the second oil temperature of the oil pump is not less than the preset oil temperature threshold, it indicates that the oil temperature of the oil pump has risen. At this time, the solenoid valve can be controlled to open, and the oil pump can run at a larger output power to output more hydraulic oil to meet the operation requirements of the transmission. On the other hand, although the starting speed of the oil pump is low, which increases the lubrication time, this embodiment starts the oil pump to output hydraulic oil in advance when the vehicle responds to the unlocking request to make up for the increase in lubrication time. Therefore, this embodiment can meet the lubrication requirements for normal operation of the transmission.

[0065] The embodiment of the present application also provides a vehicle startup control method. The method is applied to a vehicle, the vehicle includes a gearbox and an engine, the gearbox is used to adjust the output power of the engine, the gearbox includes a hydraulic system, the hydraulic system includes an oil pump and a solenoid valve, and the solenoid valve is used to control the hydraulic oil output by the oil pump to be connected to the high-pressure end or the low-pressure end of the hydraulic system. The method includes: in response to an unlocking request, receiving a first oil temperature of the oil pump, and detecting whether the first oil temperature is less than a preset oil temperature threshold. When it is detected that the first oil temperature is less than the preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the low-pressure system, and the oil pump runs at a speed lower than normal operation. In response to an ignition start request, the engine is started.

[0066] An embodiment of the present application also provides a vehicle, the vehicle comprising a gearbox and an engine, wherein the gearbox is used to adjust the output power of the engine. The gearbox of the present application also includes a memory for storing one or more computer programs. The one or more computer programs are configured to be executed by the processor. The one or more computer programs include instructions, and the above instructions can be used to implement the control method of the vehicle hydraulic system in the gearbox.

[0067] It is understandable that the structure shown in this embodiment does not constitute a specific limitation on the gearbox. In other embodiments, the gearbox may include more or fewer components than shown, or combine some components, or split some components, or arrange the components differently.

[0068] The processor may include one or more processing units, for example, the processor may include an application processor (AP), a modem, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0069] The processor may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor is a cache memory. The memory may store instructions or data that the processor has just used or is cyclically used. If the processor needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor, and thus improves the efficiency of the system.

[0070] In some embodiments, the processor may include one or more interfaces. The interface may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a SIM interface, and / or a USB interface, etc.

[0071] In some embodiments, the processor is used to execute acceleration schemes such as Single Instruction Multiple Data (SIMD) and Very Long Instruction Word (VLIW).

[0072] In some embodiments, the memory may include a high-speed random access memory and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0073] This embodiment also provides a vehicle, which includes a gearbox and an engine, and the gearbox is used to adjust the output power of the engine.

[0074] Among them, the gearbox and vehicle provided in this embodiment are used for the control method of the corresponding vehicle hydraulic system. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the control method of the vehicle hydraulic system provided above, and will not be repeated here.

[0075] In practical applications, the above functions can be distributed to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0076] In several embodiments provided in the present application, the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are schematic. For example, the division of the modules or units is a logical function division. There may be other division methods in actual implementation, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0077] The unit described as a separate component may or may not be physically separated, and the component shown as a unit may be one physical unit or multiple physical units, that is, it may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

[0078] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0079] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program code.

[0080] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application.

Claims

1. A method for controlling a vehicle hydraulic system, characterized in that: A powertrain for a vehicle, the powertrain comprising a hydraulic system, the hydraulic system comprising an oil pump and a solenoid valve, the solenoid valve being used to control the hydraulic oil output by the oil pump to communicate with a high-pressure end or a low-pressure end of the hydraulic system; the method comprising: In response to an unlocking operation of the vehicle, acquiring a first oil temperature of the oil pump; Detecting whether the first oil temperature is less than a preset oil temperature threshold; When it is detected that the first oil temperature is lower than the preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed lower than normal operation.

2. The control method of the vehicle hydraulic system according to claim 1, characterized in that: After the solenoid valve is controlled to open, the hydraulic oil outputted from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed lower than normal operation, the method further includes: Obtaining the rotation speed of the oil pump; Detecting whether the rotation speed is greater than or equal to a preset rotation speed; When it is detected that the rotation speed is greater than or equal to the preset rotation speed, the solenoid valve is controlled to close after a preset time period.

3. The control method of the vehicle hydraulic system according to claim 2, characterized in that: The oil pump includes a first pump body and a second pump body; the obtaining the rotation speed of the oil pump includes: Acquire a first rotation speed of the first pump body and a second rotation speed of the second pump body; The detecting whether the rotation speed is greater than or equal to a preset rotation speed comprises: Detecting whether the first speed is greater than or equal to the preset speed and whether the second speed is greater than or equal to the preset speed; When it is detected that the rotation speed is greater than or equal to the preset rotation speed, controlling the solenoid valve to close after a preset time period includes: When it is detected that the first speed and the second speed are both greater than or equal to the preset speed, the solenoid valve is controlled to close after the preset time period.

4. The control method of the vehicle hydraulic system according to claim 2, characterized in that: The hydraulic system further comprises an accumulator, wherein the accumulator is used to adjust the pressure within the hydraulic system; After controlling the solenoid valve to close after the preset time, the method further includes: The output pressure of the accumulator is adjusted to within a preset pressure range.

5. The control method of the vehicle hydraulic system according to claim 4, characterized in that: After adjusting the output pressure of the accumulator to within a preset pressure range, the method further comprises: acquiring a second oil temperature of the oil pump; detecting whether the second oil temperature is less than the preset oil temperature threshold; When it is detected that the second oil temperature is not less than the preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed not lower than normal operation.

6. The control method of the vehicle hydraulic system according to claim 5, characterized in that: The oil pump includes a first pump body and a second pump body; and obtaining the second oil temperature of the oil pump includes: respectively acquiring a first temperature of the first pump body and a second temperature of the second pump body; The detecting whether the second oil temperature is less than the preset oil temperature threshold comprises: respectively detecting whether the first temperature is less than the preset oil temperature threshold, and detecting whether the second temperature is less than the preset oil temperature threshold; When it is detected that the second oil temperature is not less than the preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil output from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump runs at a speed not lower than the normal operation, including: When it is detected that one or both of the first temperature and the second temperature are not less than the preset oil temperature threshold, the solenoid valve is controlled to open the hydraulic oil output from the high-pressure end of the oil pump to connect with the low-pressure end of the hydraulic system, and the oil pump operates at a speed not lower than normal operation.

7. The control method of a vehicle hydraulic system according to any one of claims 1 to 6, characterized in that: The oil pump includes a first pump body and a second pump body; and obtaining the first oil temperature of the oil pump includes: respectively acquiring a third temperature of the first pump body and a fourth temperature of the second pump body; The detecting whether the first oil temperature is less than a preset oil temperature threshold comprises: respectively detecting whether the third temperature is less than the preset oil temperature threshold, and detecting whether the fourth temperature is less than the preset oil temperature threshold; When it is detected that the first oil temperature is lower than the preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil outputted from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed lower than the normal operation, including: When it is detected that one or both of the third temperature and the fourth temperature are lower than the preset oil temperature threshold, the solenoid valve is controlled to open the hydraulic oil output from the high-pressure end of the oil pump so as to connect with the low-pressure end of the hydraulic system, and the oil pump operates at a speed lower than normal operation.

8. A vehicle startup control method, characterized in that: Applied to a vehicle, the vehicle comprises a gearbox and an engine, the gearbox is used to adjust the output power of the engine, the gearbox comprises a hydraulic system, the hydraulic system comprises an oil pump and a solenoid valve, the solenoid valve is used to control the hydraulic oil output by the oil pump to communicate with the high-pressure end or the low-pressure end of the hydraulic system; the method comprises: In response to an unlock request, receiving a first oil temperature of the oil pump; Detecting whether the first oil temperature is less than a preset oil temperature threshold; When it is detected that the first oil temperature is lower than the preset oil temperature threshold, the solenoid valve is controlled to open, the hydraulic oil outputted from the high-pressure end of the oil pump is connected to the low-pressure end of the hydraulic system, and the oil pump operates at a speed lower than normal operation; In response to an ignition start request, the engine is started.

9. A gearbox, characterized in that: The gearbox includes a hydraulic system, a processor and a memory. The hydraulic system includes an oil pump and a solenoid valve. The solenoid valve is used to control the hydraulic oil output by the oil pump to be connected to the high-pressure end or the low-pressure end of the hydraulic system. The memory is used to store instructions. The processor is used to call the instructions in the memory so that the gearbox executes the control method of the vehicle hydraulic system as described in any one of claims 1 to 7.

10. A vehicle, characterized in that: The vehicle comprises the gearbox as claimed in claim 9 and an engine, wherein the gearbox is used to adjust the output power of the engine.

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