Parking braking method and related device

Abstract

The embodiment of the invention discloses a parking braking method, which is applied to a hydraulic control system of a vehicle, and comprises the following steps: responding to a parking braking signal, and enabling a first parking electromagnetic valve to work in a first working state; the first working state is a working state that the first parking electromagnetic valve enables hydraulic oil to flow out of the parking piston cylinder in a one-way mode through the oil conveying channel; in response to the parking braking signal, the second parking electromagnetic valve works in a third working state; in the third working state, the second parking electromagnetic valve enables the hydraulic oil to flow out of the parking piston cylinder in a one-way mode through the oil conveying channel; the hydraulic oil is guided out of the parking piston cylinder through the oil conveying channel; and the parking piston is made to move towards the parking braking position according to the first hydraulic pressure provided for the parking piston when the hydraulic oil flows out of the parking piston cylinder. Hydraulic oil is guided out of the parking piston cylinder through control over on-off of the oil conveying channel by the two parking electromagnetic valves, and the response speed of parking braking is increased through the real-time performance of signal response of the electromagnetic valves.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a parking brake method and related devices. Background Art

[0002] Parking control is an important part of vehicle transmission control, also known as handbrake or P gear. Parking control includes parking brake and release. Parking brake generally locks the vehicle's drive shaft or rear wheels to brake the vehicle. Correspondingly, release is to release the lock of the vehicle's drive shaft or rear wheels to allow the vehicle to move.

[0003] The parking control solutions provided by the related technologies are mostly based on the driver's operation of the transmission handle position change or pressing the P gear button, and then directly controlling the transmission through the Electronic Control Unit (ECU) to achieve parking brake or release parking.

[0004] However, since most transmissions are hydraulic transmission systems, when the ECU controls the automatic transmission for parking control, the transmission hydraulic control logic does not match the hydraulic transmission system, resulting in a significant lag in the transmission hydraulic control, which causes the transmission to be unable to quickly and promptly respond to changes in the transmission handle position or the P gear button to achieve parking control. Summary of the invention

[0005] In order to take into account the response speed and smoothness of parking brakes, the present application provides a parking brake method and related devices, which switches the working state of the parking switch valve by switching the current of the parking solenoid valve to indirectly control the on-off of the oil supply channel, thereby improving the response speed of the vehicle's parking brake.

[0006] The embodiments of the present application disclose the following technical solutions:

[0007] In a first aspect, an embodiment of the present application discloses a parking brake method, which is applied to a hydraulic control system of a vehicle, wherein the hydraulic control system includes hydraulic oil, a second parking switch valve, a first oil delivery channel, a second oil delivery channel, a parking solenoid valve, a parking piston cylinder and a parking piston, and the method includes:

[0008] In response to receiving a parking brake signal, the parking solenoid valve is energized to make the parking solenoid valve work in a first working state; the first working state is a working state in which the parking solenoid valve makes the hydraulic oil flow through the parking solenoid valve through the first oil delivery channel;

[0009] The second parking switch valve is switched to a third working state by the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel; the third working state is a working state in which the hydraulic oil flows out of the parking piston cylinder through the second oil delivery channel and the second parking switch valve;

[0010] Delivering the hydraulic oil from the parking piston cylinder through the second oil delivery channel;

[0011] The parking piston moves toward the parking brake position according to the first oil pressure provided to the parking piston when the hydraulic oil flows out of the parking piston cylinder; the first oil pressure is the oil pressure that causes the parking piston to move closer to the cylinder bottom of the parking piston cylinder.

[0012] Optionally, the second parking switch valve includes a second return spring;

[0013] The second parking switch valve is switched to a third working state by the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel, including:

[0014] The second parking switch valve is subjected to the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel and the second spring force, so that the second parking switch valve switches to the third working state; the second spring force is the force provided by the second return spring to the second parking switch valve.

[0015] Optionally, the hydraulic control system further includes a first parking switch valve, the second parking switch valve further includes a pressure valve, and the method further includes:

[0016] In response to receiving a parking release signal, the parking solenoid valve is energized to make the parking solenoid valve work in the first working state;

[0017] The first parking switch valve is switched to a fourth working state by the first hydraulic pressure provided by the hydraulic oil in the first oil delivery channel; the fourth working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the first parking switch valve;

[0018] The second parking switch valve is switched to a second working state by the valve pressure provided by the pressure valve; the second working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the second parking switch valve;

[0019] Introducing the hydraulic oil into the parking piston cylinder through the second oil delivery channel;

[0020] The parking piston moves toward the parking release position according to a second oil pressure provided to the parking piston when the hydraulic oil is introduced into the parking piston cylinder; the second oil pressure is an oil pressure that moves the parking piston away from the cylinder bottom of the parking piston cylinder.

[0021] Optionally, the first parking solenoid valve further includes a first return spring;

[0022] The first parking switch valve is switched to a fourth working state by the first hydraulic pressure provided by the hydraulic oil in the first oil delivery channel, including:

[0023] The first parking switch valve is subjected to the first hydraulic pressure and the first spring force provided by the hydraulic oil in the first oil delivery channel, so that the first parking switch valve is switched to the fourth working state; the first spring force is the force provided by the first return spring to the first parking switch valve.

[0024] Optionally, after the parking piston moves toward the parking release position according to the second oil pressure provided to the parking piston when the hydraulic oil is introduced into the parking piston cylinder, the method further includes:

[0025] In response to determining that the parking piston has not moved to the parking release position after a first preset time has passed, controlling the parking piston to move the parking piston toward the parking brake position;

[0026] In response to determining that the parking piston moves to the parking brake position, providing a second valve pressure to the second parking switch valve by controlling the pressure valve; the second valve pressure is greater than the first valve pressure;

[0027] In response to determining that the parking piston moves to the parking brake position, providing a third oil pressure to the first parking switch valve through the first oil delivery passage, wherein the third oil pressure is greater than the first oil pressure, so that the parking piston moves to the parking release position;

[0028] After a second preset time, determining the current position of the parking piston;

[0029] In response to the current position of the parking piston being the parking release position, it is determined that the vehicle is in a parking release state.

[0030] Optionally, the method further includes:

[0031] In response to the current position of the parking piston being different from the parking release position, a parking release fault signal is issued.

[0032] Optionally, the determining the current position of the parking piston is determined by a piston position sensor;

[0033] The method further comprises:

[0034] In response to receiving a sensor fault signal reported by the piston position sensor, according to the parking release signal, by controlling the pressure valve, a third valve pressure is provided to the second parking switch valve; the third valve pressure is greater than the first valve pressure;

[0035] In response to receiving a sensor fault signal reported by the piston position sensor, according to the parking release signal, a third oil pressure is provided to the first parking switch valve through the first oil pipeline to move the parking piston toward the parking brake position, wherein the third oil pressure is greater than the first oil pressure;

[0036] After a third preset time, when the parking piston is located at the parking release position, it is determined that the vehicle is in a parking release state.

[0037] Optionally, the hydraulic control system further includes a parking solenoid and a parking claw, and the method further includes:

[0038] In response to the parking piston moving to the unparking position, fixing the parking piston in the unparking position by controlling the parking pawl;

[0039] energizing the parking solenoid in response to the parking piston moving to the unparked position;

[0040] The parking piston is controlled according to the magnetic force provided by the energization of the parking electromagnet so as to be fixed at the parking release position.

[0041] In a second aspect, an embodiment of the present application discloses a parking brake device, which is applied to a hydraulic control system of a vehicle, wherein the hydraulic control system includes hydraulic oil, a second parking switch valve, a first oil delivery channel, a second oil delivery channel, a parking solenoid valve, a parking piston cylinder and a parking piston, and the device includes:

[0042] a first electronic control unit, configured to, in response to receiving a parking brake signal, energize the parking solenoid valve so that the parking solenoid valve operates in a first operating state; the first operating state is an operating state in which the parking solenoid valve causes the hydraulic oil to flow through the parking solenoid valve through the first oil delivery channel;

[0043] a first hydraulic unit, configured to switch the second parking switch valve to a third working state when the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel is applied; the third working state is a working state in which the hydraulic oil flows out of the parking piston cylinder through the second oil delivery channel and the second parking switch valve;

[0044] A hydraulic oil outlet unit, used to outlet the hydraulic oil from the parking piston cylinder through the second oil delivery channel;

[0045] The first parking piston control unit is used to provide a first oil pressure to the parking piston when the hydraulic oil flows out of the parking piston cylinder, so that the parking piston moves toward the parking brake position; the first oil pressure is the oil pressure that causes the parking piston to move closer to the cylinder bottom of the parking piston cylinder.

[0046] Optionally, the second parking switch valve includes a second return spring;

[0047] The first hydraulic unit is further used for:

[0048] The second parking switch valve is subjected to the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel and the second spring force, so that the second parking switch valve switches to the third working state; the second spring force is the force provided by the second return spring to the second parking switch valve.

[0049] Optionally, the hydraulic control system further includes a first parking switch valve, the second parking switch valve further includes a pressure valve, and the device further includes:

[0050] a second electronic control unit, configured to energize the parking solenoid valve in response to receiving a parking release signal, so that the parking solenoid valve operates in the first operating state;

[0051] a second hydraulic unit, configured to switch the first parking switch valve to a fourth working state when the first hydraulic pressure provided by the hydraulic oil in the first oil delivery channel is applied; the fourth working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the first parking switch valve;

[0052] a third hydraulic unit, for switching the second parking switch valve to a second working state when the second parking switch valve is subjected to the valve pressure provided by the pressure valve; the second working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the second parking switch valve;

[0053] A hydraulic oil introduction unit, used to introduce the hydraulic oil into the parking piston cylinder through the second oil delivery channel;

[0054] a second parking piston control unit, for moving the parking piston toward a parking release position according to a second oil pressure provided to the parking piston when the hydraulic oil is introduced into the parking piston cylinder; the second oil pressure is an oil pressure that moves the parking piston away from the cylinder bottom of the parking piston cylinder.

[0055] Optionally, the first parking solenoid valve further includes a first return spring;

[0056] The second hydraulic unit is further used for:

[0057] The first parking switch valve is subjected to the first hydraulic pressure and the first spring force provided by the hydraulic oil in the first oil delivery channel, so that the first parking switch valve is switched to the fourth working state; the first spring force is the force provided by the first return spring to the first parking switch valve.

[0058] Optionally, the device further comprises:

[0059] a third parking piston control unit, configured to control the parking piston to move toward the parking brake position in response to determining that the parking piston has not moved to the parking release position after a first preset time has passed;

[0060] a fourth hydraulic unit, configured to provide a second valve pressure to the second parking switch valve by controlling the pressure valve in response to determining that the parking piston moves to the parking brake position; the second valve pressure is greater than the first valve pressure;

[0061] a fifth hydraulic unit, configured to, in response to determining that the parking piston moves to the parking brake position, provide a third oil pressure to the first parking switch valve through the first oil delivery passage, wherein the third oil pressure is greater than the first oil pressure, so that the parking piston moves to the parking release position;

[0062] a piston position determination unit, configured to determine a current position of the parking piston after a second preset time;

[0063] The first vehicle state determination unit is configured to determine that the vehicle is in a released parking state in response to a current position of the parking piston being the released parking position.

[0064] Optionally, the device further comprises:

[0065] The fault signal alarm unit is used for reporting a parking release fault signal in response to the current position of the parking piston being different from the parking release position.

[0066] Optionally, the current position of the parking piston is determined by a piston position sensor; and the device further comprises:

[0067] a sixth hydraulic unit, configured to respond to receiving a sensor fault signal reported by the piston position sensor and, according to the parking release signal, control the pressure valve to provide a third valve pressure to the second parking switch valve; the third valve pressure is greater than the first valve pressure;

[0068] a seventh hydraulic unit, configured to respond to receiving a sensor fault signal reported by the piston position sensor and, according to the parking release signal, provide a third oil pressure to the first parking switch valve through the first oil pipeline to move the parking piston toward the parking brake position, wherein the third oil pressure is greater than the first oil pressure;

[0069] The second vehicle state determination unit is used to determine that the vehicle is in a released parking state when the parking piston is located at the released parking position after a third preset time.

[0070] Optionally, the hydraulic control system further includes a parking solenoid and a parking claw, and the device further includes:

[0071] a parking pawl control unit, configured to fix the parking piston in the unparking position by controlling the parking pawl in response to the parking piston moving to the unparking position;

[0072] a parking solenoid electronic control unit, for energizing the parking solenoid in response to the parking piston moving to the parking release position;

[0073] The fourth parking piston control unit is used to control the parking piston according to the magnetic force provided by the parking electromagnet being energized, so that the parking piston is fixed in the parking release position.

[0074] In a third aspect, an embodiment of the present application discloses a computer device, wherein the computer device includes a processor and a memory:

[0075] The memory is used to store program code and transmit the program code to the processor;

[0076] The processor is used to execute the parking braking method as described in the first aspect and any optional option of the first aspect according to the instructions in the program code.

[0077] In a fourth aspect, an embodiment of the present application discloses a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, and when the computer program is executed by a processor, the parking braking method as described in the first aspect and any optional option of the first aspect is executed.

[0078] It can be seen from the above technical scheme that, in response to receiving the parking brake signal, the parking solenoid valve is energized to make the parking solenoid valve work in the first working state; the first working state is the working state in which the parking solenoid valve allows the hydraulic oil to flow through the parking solenoid valve through the first oil supply channel; the second parking switching valve is subjected to the second hydraulic pressure provided by the hydraulic oil in the first oil supply channel, and switches to the third working state; the third working state is the working state in which the hydraulic oil flows out of the parking piston cylinder through the second oil supply channel through the second parking switching valve; the hydraulic oil is extracted from the parking piston cylinder through the second oil supply channel; according to the first oil pressure provided to the parking piston when the hydraulic oil flows out of the parking piston cylinder, the parking piston moves to the parking brake position; the first oil pressure is the oil pressure that makes the parking piston move close to the cylinder bottom of the parking piston cylinder. The parking solenoid valve is powered on and off to control the on and off of the first oil pipeline, so that the hydraulic oil in the first oil pipeline provides controlled oil pressure to the second parking switch valve, so that when the parking brake signal is received, the hydraulic oil is discharged from the parking piston cylinder to put the vehicle into the parking brake state, thereby improving the vehicle's response speed to the driver's parking brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0080] Figure 1 A flowchart of a parking brake method provided in an embodiment of the present application;

[0081] Figure 2 A schematic diagram of a hydraulic control system circuit applied to a parking brake method provided in an embodiment of the present application;

[0082] Figure 3 A hydraulic oil flow diagram in a hydraulic control system during parking brake provided in an embodiment of the present application;

[0083] Figure 4 A timing diagram of the on-off current of a solenoid valve in a hydraulic control system during parking braking provided in an embodiment of the present application;

[0084] Figure 5 A hydraulic oil flow diagram in a hydraulic control system when releasing parking provided by an embodiment of the present application;

[0085] Figure 6 A timing diagram of the on-off current of a solenoid valve in a hydraulic control system when releasing parking provided by an embodiment of the present application;

[0086] Figure 7 A structural block diagram of a device for parking brake provided in an embodiment of the present application;

[0087] Figure 8 A structural block diagram of a computer device for parking brake provided in an embodiment of the present application. DETAILED DESCRIPTION

[0088] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0089] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances. This is just a way of distinguishing objects with the same attributes when describing the embodiments of this application.

[0090] In order to facilitate understanding of the technical solution of the present application, some technical terms involved in the present application are introduced below.

[0091] Parking control is an important part of vehicle transmission control, also known as handbrake or P gear. Parking control includes parking brake and release. Parking brake generally locks the vehicle's drive shaft or rear wheels to brake the vehicle. Correspondingly, release is to release the lock of the vehicle's drive shaft or rear wheels to allow the vehicle to move.

[0092] The parking control solutions provided by the related technologies are mostly based on the driver's operation of the transmission handle position change or pressing the P gear button, and then directly controlling the transmission through the Electronic Control Unit (ECU) to achieve parking brake or release parking.

[0093] However, since most transmissions are hydraulic transmission systems, when the ECU controls the automatic transmission for parking control, the transmission hydraulic control logic does not match the hydraulic transmission system, resulting in a significant lag in the transmission hydraulic control, which causes the transmission to be unable to respond quickly and promptly to changes in the transmission handle position to achieve parking control.

[0094] In order to take into account both the response speed and smoothness of the parking brake, an embodiment of the present application provides a parking control method, which controls the flow direction of the hydraulic oil in the oil delivery channel through a parking solenoid valve to control the parking switch valve to guide the hydraulic oil out of the parking piston cylinder, so that the parking piston moves to the parking brake position according to the oil pressure provided by the hydraulic oil to realize the parking brake of the vehicle.

[0095] A parking brake method provided in an embodiment of the present application is introduced below in conjunction with the accompanying drawings.

[0096] Among them, a parking brake method provided in an embodiment of the present application can be applied to fuel vehicles powered by an internal combustion engine or pure electric vehicles powered by a rechargeable battery, and can also be applied to hybrid vehicles powered by both fuel and electricity, such as extended-range hybrid vehicles or oil-electric hybrid vehicles.

[0097] Furthermore, a parking brake method provided in an embodiment of the present application may be applied to a hydraulic control system, and the hydraulic control system may be a hydraulically controlled transmission in a vehicle, such as an automatic transmission (AT) and the like.

[0098] See also Figure 1 , Figure 1 A flow chart of a parking brake method provided in an embodiment of the present application. The method is applied to a hydraulic control system of a vehicle, the hydraulic control system comprising hydraulic oil, a first parking solenoid valve, a second parking solenoid valve, an oil delivery channel, a parking piston cylinder and a parking piston, the method comprising:

[0099] S101: In response to receiving a parking brake signal, the parking solenoid valve is energized to make the parking solenoid valve work in a first working state.

[0100] Among them, the first working state is a working state in which the parking solenoid valve allows the hydraulic oil to flow through the parking solenoid valve through the first oil delivery channel.

[0101] See also Figure 2 , Figure 2 A schematic diagram of a hydraulic control system circuit used in a parking brake method provided in an embodiment of the present application. Figure 2 In the figure, the main control oil pressure supply circuit is the first oil delivery channel, the main oil pressure supply circuit is the second oil delivery channel, the hydraulic oil flows into the first oil delivery channel and the second oil delivery channel from the arrow in the figure, PK-V1 is the first parking switch valve, PK-V2 is the second parking switch valve, SPK is the parking solenoid valve, and the first oil delivery channel is switched on and off by energizing and de-energizing the parking solenoid valve, PK LC is the parking electromagnet, and when the parking electromagnet is energized, it is used to attract the parking piston to fix its position; in Park Act, the shell is the parking piston cylinder, and the movable part inside it is the parking piston. The parking piston is controlled to move outward or inward by increasing or decreasing the hydraulic oil in the parking piston cylinder.

[0102] In some possible implementations of the embodiments of the present application, the driver can issue a parking brake command by pulling up the handbrake or pressing the parking brake "P" button. The vehicle sends a parking brake signal to the vehicle's automatic transmission control unit (Transmission Control Unit, TCU) through the electronic control unit (Electronic Control Unit, ECU), and the TCU controls the entire transmission and each component in the transmission based on the parking brake signal.

[0103] Among them, the parking solenoid valve is an electromagnetically controlled device. The movement of the parking solenoid valve is controlled by turning the electromagnet in the parking solenoid valve on and off, so that different oil inlet holes and oil outlet holes of the parking solenoid valve are connected to the external oil delivery channel to achieve directional flow of hydraulic oil. When the parking solenoid valve is powered on, the parking solenoid valve works in the left position, that is, it works in the first working state, the first oil delivery channel is connected, and the hydraulic oil can flow through the first oil delivery channel; when the parking solenoid is powered off, the parking solenoid valve works in the right position, that is, it works in the second working state, the first oil delivery channel is cut off, and the hydraulic oil cannot flow through the first output channel.

[0104] S102: The second parking switch valve is subjected to the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel and switches to the third working state.

[0105] Among them, the third working state is a working state in which the hydraulic oil flows out of the parking piston cylinder through the second oil delivery channel and the second parking switch valve.

[0106] Among them, Figure 2 In the hydraulic control system shown, the second parking switch valve shown in the figure works in the right position, that is, it is in the third working state; when the first parking switch valve moves so that the oil inlet hole, the oil outlet hole and the oil delivery channel in the left half are connected, that is, when the second parking switch valve works in the left position, the second parking switch valve is in the second working state.

[0107] In some possible implementations of the embodiment of the present application, the second parking switch valve includes a second return spring;

[0108] The second parking switch valve is switched to a third working state by the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel, including:

[0109] The second parking switch valve is subjected to the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel and the second spring force, so that the second parking switch valve is switched to the third working state.

[0110] The second spring force is the force provided by the second return spring to the second parking switch valve.

[0111] By energizing the parking solenoid valve, the parking solenoid valve works in the left position, and the first oil pipeline outputs hydraulic oil through the parking solenoid valve to apply the second hydraulic pressure to the second parking switch valve, so that the second parking switch valve moves to the right and works in the left position, that is, it is in the third working state. Correspondingly, by de-energizing the parking solenoid valve, the parking solenoid valve works in the right position, the first oil pipeline cannot output hydraulic oil through the parking solenoid valve, and the second parking switch valve is not subjected to the second hydraulic pressure. The second spring force given by the second return spring on its right side causes the second parking switch valve to move to the left and work in the right position, that is, it is in the second working state.

[0112] S103: The hydraulic oil is discharged from the parking piston cylinder through the second oil delivery channel.

[0113] Since the second parking switch valve works in the right position, that is, the second oil delivery channel is connected, the hydraulic oil flows out of the parking piston cylinder under pressure.

[0114] S104: The parking piston moves toward the parking brake position according to the first oil pressure provided to the parking piston when the hydraulic oil flows out of the parking piston cylinder.

[0115] The first oil pressure is the oil pressure that causes the parking piston to move closer to the cylinder bottom of the parking piston cylinder.

[0116] As the hydraulic oil flows out of the parking piston cylinder, the force balance of the parking piston in the parking brake position is broken. The reduced hydraulic oil in the parking piston cylinder reduces the thrust provided by the hydraulic oil to the parking piston, so that the resultant force on the parking piston is the first oil pressure to the left, causing the parking piston to move to the left under the drive of the first oil pressure, that is, to move to the parking brake position.

[0117] Next, a parking brake method provided in an embodiment of the present application will be introduced in combination with an actual control timing step of a parking brake.

[0118] Please also read Figure 3 as well as Figure 4 , Figure 3 A hydraulic oil flow diagram in a hydraulic control system during parking brake provided in an embodiment of the present application, Figure 4 This is a timing diagram of the on-off current of a solenoid valve in a hydraulic control system during parking braking provided by an embodiment of the present application. Figure 3 The components of the hydraulic control system shown are Figure 2 The description of its components and their controls is the same as Figure 2 same, Figure 4 The current on-off timing sequence shown is Figure 3 The current on and off of each component is shown in the figure and will not be repeated here.

[0119] exist Figure 4In the current on-off timing diagram shown, the horizontal axis represents time, and dt1, dt2, dt3 and dt4 are pre-calibrated time intervals to control the parking solenoid valve within the corresponding time intervals. When representing the parking solenoid valve and the parking electromagnet, the vertical axis is the current; when representing the parking piston, the vertical axis is the parking piston position, that is, the relative distance between the parking piston and the bottom of the parking piston.

[0120] Before receiving the parking brake signal, the parking solenoid valve is not energized and the parking solenoid remains energized so that the parking piston remains in the parking release position.

[0121] When the parking brake signal is received, the parking solenoid remains energized during the dt1 period, and the parking piston remains in the parking release position.

[0122] During the dt2 time period, the parking solenoid is de-energized, and the magnetic force provided by the parking solenoid to the parking piston disappears. However, since the parking piston cylinder is still full of hydraulic oil at this time, the hydraulic oil provides thrust for the parking piston, so that the parking piston is still in the parking release position.

[0123] During the dt3 time period, the parking solenoid valve is energized, so that the parking solenoid valve works in the first working state, the first oil delivery channel is connected, and the hydraulic oil flows through the first oil delivery channel to provide a second hydraulic pressure for the second parking switch valve, overcoming the second spring force provided by the second return spring for the second parking switch valve to drive the second parking switch valve to move left, so that the second parking switch valve works in the third working state, and the first oil delivery channel is connected, and the hydraulic oil in the parking piston cylinder is discharged, so that the parking piston moves to the left, that is, moves to the parking brake position.

[0124] In addition to the parking brake, the parking control also includes releasing the parking, so that the vehicle is released from the parking to travel normally. Based on the above embodiment, further, the method also includes:

[0125] In response to receiving the parking release signal, the parking solenoid valve is energized to make the parking solenoid valve work in a first working state;

[0126] The first parking switch valve is switched to the fourth working state by the first hydraulic pressure provided by the hydraulic oil in the first oil delivery channel; the fourth working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the first parking switch valve;

[0127] The second parking switch valve is switched to the second working state by the valve pressure provided by the pressure valve; the second working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the second parking switch valve;

[0128] Introducing the hydraulic oil into the parking piston cylinder through the second oil delivery channel;

[0129] The parking piston moves toward the parking release position according to the second oil pressure provided to the parking piston when the hydraulic oil is introduced into the parking piston cylinder; the second oil pressure is the oil pressure that moves the parking piston away from the cylinder bottom of the parking piston cylinder.

[0130] In some possible implementations of this embodiment, the first parking solenoid valve further includes a first return spring;

[0131] The first parking switch valve is switched to the fourth working state by the first hydraulic pressure provided by the hydraulic oil in the first oil delivery channel, including:

[0132] The first parking switch valve is subjected to the first hydraulic pressure and the first spring force provided by the hydraulic oil in the first oil delivery channel, so that the first parking switch valve is switched to the fourth working state; the first spring force is the force provided by the first return spring to the first parking switch valve.

[0133] Next, the method for releasing parking provided by the embodiment of the present application will be introduced in combination with an actual control timing step for releasing parking.

[0134] See also Figure 5 , see also Figure 6 , Figure 5 A hydraulic oil flow diagram in a hydraulic control system when releasing parking provided by an embodiment of the present application, Figure 6 This is a timing diagram of the on-off current of the solenoid valve in the hydraulic control system when releasing the parking brake provided in the embodiment of the present application. Figure 5 The components of the hydraulic control system shown are Figure 2 as well as Figure 3 The description of its components and their controls is the same as Figure 2 as well as Figure 3 same, Figure 6 The current on-off timing sequence shown is Figure 5 The current on and off of each component is shown in the figure, and will not be repeated here. The difference is: Figure 5 and Figure 6 The clutch C and C valve shown in the figure are pressure valves, and the C valve oil pressure is the first valve pressure.

[0135] exist Figure 6 In the current on-off timing diagram shown, the horizontal axis represents time, and dt1, dt2, dt3 and dt4 are pre-calibrated time intervals to control the parking solenoid valve within the corresponding time intervals. When representing the parking solenoid valve and the parking electromagnet, the vertical axis is the current; when representing the parking piston, the vertical axis is the parking piston position, that is, the relative distance between the parking piston and the bottom of the parking piston; when representing the C valve oil pressure, the vertical axis is the pressure.

[0136] Before receiving the parking release signal, during the dt1 period, the parking solenoid is in a power-off state, so that the parking piston is located in the parking brake position. At the same time, the first valve pressure is provided to the second parking switch valve through the pressure valve, so that the second parking switch valve moves rightward to work in the left position.

[0137] During the dt2 time period, the parking solenoid valve is energized, so that the parking solenoid valve works in the first working state, the first oil delivery channel is connected, and the hydraulic oil flows through the first oil delivery channel to provide a first hydraulic pressure for the first parking switch valve. When the first hydraulic pressure is greater than the first spring force provided by the first return spring to the first parking switch valve, the first parking switch valve is driven to the right by the combined force of the first hydraulic pressure and the first spring force to work in the left position, and the second oil delivery channel is connected at the first parking switch valve, and the hydraulic oil flows in the second oil delivery channel through the first parking switch valve to the parking piston cylinder.

[0138] At the same time, during the dt2 time period, the hydraulic oil simultaneously provides the second hydraulic pressure to the second parking switch valve through the first oil delivery channel. At this time, when the first valve pressure is greater than the combined force of the second spring force and the second hydraulic pressure, the second parking switch valve is driven by the first valve pressure that overcomes the second spring force and the second hydraulic pressure, moves to the right to work in the left position, and the second oil delivery channel is connected at the second parking switch valve. At this time, the oil inlet of the second oil delivery channel is connected to the parking oil plug cylinder, and the hydraulic oil is driven into the parking oil plug cylinder in the oil delivery channel to provide the second oil pressure to the parking oil plug, so as to drive the parking oil plug to move to the release position.

[0139] After the dt2 time has passed, the parking oil plug has moved to the release position. During the dt3 time period, the parking solenoid is energized to provide magnetic force to the parking piston so as to attract the parking piston to remain in the release position.

[0140] During the dt4 period, the parking solenoid valve is de-energized, and the first parking switch valve leaves the fourth working state to cut off the second oil delivery channel, so that the hydraulic oil in the second oil delivery channel cannot flow freely, and the parking piston is kept in the parking release position.

[0141] If a component of the hydraulic control system fails, such as a partial blockage in a section of the oil delivery channel, the process of hydraulic oil entering the parking piston cylinder will be blocked, resulting in insufficient oil pressure provided by the hydraulic oil to the parking piston, causing the parking release to fail.

[0142] To solve the above technical problem, based on the above embodiment, the method further includes:

[0143] In response to determining that the parking piston has not moved to the parking release position after a first preset time has passed, controlling the parking piston to move the parking piston toward the parking brake position;

[0144] In response to determining that the parking piston moves to the parking brake position, providing a second valve pressure to the second parking switch valve by controlling the pressure valve; the second valve pressure is greater than the first valve pressure;

[0145] In response to determining that the parking piston moves to the parking brake position, a third oil pressure is provided to the first parking switch valve through the first oil delivery passage, the third oil pressure being greater than the first oil pressure, so that the parking piston moves to the parking release position;

[0146] After a second preset time, determining the current position of the parking piston;

[0147] In response to determining that the current position of the parking piston is the parking release position, determining that the vehicle is in a parking release state;

[0148] In response to determining that the current position of the park piston is different from the park release position, a park release fault signal is annunciated.

[0149] Next, we will combine Figure 4 and Figure 6 The power-on timing diagrams of the parking brake and the parking release are shown to introduce a specific implementation method of the solution to the technical problem of parking release failure.

[0150] Among them, the first preset time is Figure 6 The total time of the three time periods dt1, dt2 and dt3, the second preset time can be Figure 4 The total time of the three time periods dt1, dt2 and dt3.

[0151] Starting from receiving the release parking signal, the position of the parking piston is detected after a first preset time. This detection can be detected by the piston position sensor and compared with the release parking position that the parking piston should be in through the ECU. For example, it can be determined whether the parking piston is in the release parking position based on the relative position of the housing of the parking piston cylinder and the parking piston. If the parking piston is already in the release parking position, the vehicle is already in the release parking state, and the driver can be informed through the instrument panel, the large screen of the vehicle computer or voice broadcast.

[0152] If the parking piston is not in the parking release position, it means that the vehicle has failed to release the parking. At this time, the parking piston is controlled to move toward the parking brake position. At this time, the control process of the parking piston moving toward the parking brake position can refer to the control process in the aforementioned parking brake method, which will not be repeated here.

[0153] When the piston position sensor obtains that the parking piston is in the parking brake position, the parking piston is controlled to move to the release position. At this time, the control process of the parking piston moving to the release position can refer to the control process in the aforementioned release method. However, what is different from the aforementioned control method of releasing parking is that at this time, a second valve pressure is provided to the second parking switch valve through a pressure valve, that is, a valve pressure greater than the first valve pressure is provided, and at the same time, a third oil pressure is provided to the first parking switch valve through the first oil supply channel, that is, a third oil pressure greater than the first oil pressure is provided, thereby compensating for the problem that the second parking switch valve cannot move to the corresponding working state due to low valve pressure, or the first parking switch valve cannot move to the corresponding working state due to low oil pressure.

[0154] When the parking piston still cannot reach the parking release position after driving the two parking switch valves with a larger valve pressure and a larger oil pressure, signals such as inability to release parking or parking release failure are reported to the driver, so that the vehicle can complete parking release under the fault condition, and the driver can also be promptly reminded that there is a parking release failure.

[0155] When the piston position sensor fails and the parking piston position cannot be obtained, it is impossible to determine whether the vehicle is in the parking brake state or the parking state is released based on the current position of the parking piston.

[0156] To solve the above technical problem, based on the above embodiment, further, the current position of the parking piston is determined by a piston position sensor;

[0157] The method further includes:

[0158] In response to receiving a sensor fault signal reported by the piston position sensor, according to the parking release signal, a third valve pressure is provided to the second parking switch valve by controlling the pressure valve; the third valve pressure is greater than the first valve pressure;

[0159] In response to receiving a sensor fault signal reported by the piston position sensor, according to the parking release signal, a third oil pressure is provided to the first parking switch valve through the first oil pipeline to move the parking piston to the parking brake position, and the third oil pressure is greater than the first oil pressure;

[0160] After the third preset time, when the parking piston is located at the parking release position, it is determined that the vehicle is in the parking release state.

[0161] The third preset time may be confirmed by calibration.

[0162] When the piston position sensor reports a sensor fault signal, since the specific position of the parking piston cannot be known through the sensor to determine whether the vehicle is in the parking brake or released parking state, after obtaining the release parking signal, the pressure valve can provide a third valve pressure to the second parking switch valve, that is, a valve pressure greater than the first valve pressure, and at the same time, the first oil delivery channel can provide a third oil pressure to the first parking switch valve, that is, a greater oil pressure than the first oil pressure, so that the first parking switch valve and the second parking switch valve obtain a greater driving force to achieve the corresponding working state. After the third preset time, the state of the whole vehicle is determined to be the released parking state.

[0163] Of course, in the case of a sensor failure, the parking piston can be moved to the parking brake position through a parking brake signal. Similar to the above control idea, a greater oil pressure can be provided to the second parking switch valve through the first oil pipeline, so that the second parking switch valve is driven to the corresponding working position by a greater pressure. After a third preset time, the state of the entire vehicle is determined to be a parking brake state.

[0164] Through the above method, the vehicle's parking control or parking release can still be achieved when the piston position sensor fails, and the vehicle's parking function will not be immediately out of control due to the failure of the piston position sensor. This leaves time for the driver to deal with the vehicle fault according to the sensor failure, thereby improving the safety of the vehicle's drivers and passengers.

[0165] In order to keep the position of the parking piston stable and prevent the parking control of the vehicle from being unstable due to the change of the parking piston position, based on the above embodiment, further, the hydraulic control system also includes a parking electromagnet and a parking claw, and the method also includes:

[0166] In response to the parking piston moving to the unparking position, the parking piston is fixed in the unparking position by controlling the parking pawl;

[0167] energizing the parking solenoid in response to the parking piston moving to the released parking position;

[0168] According to the magnetic force provided by the parking solenoid when it is energized, the parking piston is controlled so that the parking piston is fixed in the parking release position.

[0169] Among them, the claw is a component used in a mechanical structure to clamp or hold a workpiece, so that the position of the clamped or held workpiece is fixed to prevent it from shaking or losing its position. The parking claw is a component used to clamp the parking piston, so that the parking piston is fixed in the release position.

[0170] Among them, the electromagnet is a device that can generate magnetic force through electric current. It has magnetic force when it is powered on, and loses its magnetic force when it is powered off. The parking electromagnet generates magnetic force when it is powered on to attract the parking piston, and the parking piston is fixed in combination with the parking claw to improve the parking control stability of the vehicle.

[0171] See also Figure 7 , Figure 7 This is a structural block diagram of a device for parking brake provided in an embodiment of the present application. The device is applied to a hydraulic control system of a vehicle, the hydraulic control system includes hydraulic oil, a second parking switch valve, a first oil delivery channel, a second oil delivery channel, a parking solenoid valve, a parking piston cylinder and a parking piston, and the device includes:

[0172] The first electronic control unit 710 is used for, in response to receiving a parking brake signal, energizing the parking solenoid valve so that the parking solenoid valve operates in a first working state; the first working state is a working state in which the parking solenoid valve causes the hydraulic oil to flow through the parking solenoid valve through the first oil delivery channel;

[0173] A first hydraulic unit 720, for switching the second parking switch valve to a third working state when the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel is applied; the third working state is a working state in which the hydraulic oil flows out of the parking piston cylinder through the second oil delivery channel and the second parking switch valve;

[0174] A hydraulic oil outlet unit 730, used to outlet the hydraulic oil from the parking piston cylinder through the second oil delivery channel;

[0175] The first parking piston control unit 740 is used to provide the parking piston with a first oil pressure when the hydraulic oil flows out of the parking piston cylinder, so that the parking piston moves toward the parking brake position; the first oil pressure is the oil pressure that causes the parking piston to move closer to the bottom of the parking piston cylinder.

[0176] As a possible implementation, the second parking switch valve includes a second return spring;

[0177] The first hydraulic unit is further used for:

[0178] The second parking switch valve is subjected to the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel and the second spring force, so that the second parking switch valve switches to the third working state; the second spring force is the force provided by the second return spring to the second parking switch valve.

[0179] As a possible implementation manner, the hydraulic control system further includes a first parking switch valve, the second parking switch valve further includes a pressure valve, and the device further includes:

[0180] a second electronic control unit, configured to energize the parking solenoid valve in response to receiving a parking release signal, so that the parking solenoid valve operates in the first operating state;

[0181] a second hydraulic unit, configured to switch the first parking switch valve to a fourth working state when the first hydraulic pressure provided by the hydraulic oil in the first oil delivery channel is applied; the fourth working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the first parking switch valve;

[0182] a third hydraulic unit, for switching the second parking switch valve to a second working state when the second parking switch valve is subjected to the valve pressure provided by the pressure valve; the second working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the second parking switch valve;

[0183] A hydraulic oil introduction unit, used to introduce the hydraulic oil into the parking piston cylinder through the second oil delivery channel;

[0184] a second parking piston control unit, for moving the parking piston toward a parking release position according to a second oil pressure provided to the parking piston when the hydraulic oil is introduced into the parking piston cylinder; the second oil pressure is an oil pressure that moves the parking piston away from the cylinder bottom of the parking piston cylinder.

[0185] As a possible implementation manner, the first parking solenoid valve further includes a first return spring;

[0186] The second hydraulic unit is further used for:

[0187] The first parking switch valve is subjected to the first hydraulic pressure and the first spring force provided by the hydraulic oil in the first oil delivery channel, so that the first parking switch valve is switched to the fourth working state; the first spring force is the force provided by the first return spring to the first parking switch valve.

[0188] As a possible implementation manner, the device further includes:

[0189] a third parking piston control unit, configured to control the parking piston to move toward the parking brake position in response to determining that the parking piston has not moved to the parking release position after a first preset time has passed;

[0190] a fourth hydraulic unit, configured to provide a second valve pressure to the second parking switch valve by controlling the pressure valve in response to determining that the parking piston moves to the parking brake position; the second valve pressure is greater than the first valve pressure;

[0191] a fifth hydraulic unit, configured to, in response to determining that the parking piston moves to the parking brake position, provide a third oil pressure to the first parking switch valve through the first oil delivery passage, wherein the third oil pressure is greater than the first oil pressure, so that the parking piston moves to the parking release position;

[0192] a piston position determination unit, configured to determine a current position of the parking piston after a second preset time;

[0193] The first vehicle state determination unit is configured to determine that the vehicle is in a released parking state in response to a current position of the parking piston being the released parking position.

[0194] As a possible implementation manner, the device further includes:

[0195] The fault signal alarm unit is used for reporting a parking release fault signal in response to the current position of the parking piston being different from the parking release position.

[0196] As a possible implementation manner, the current position of the parking piston is determined by a piston position sensor; and the device further comprises:

[0197] a sixth hydraulic unit, configured to respond to receiving a sensor fault signal reported by the piston position sensor and, according to the parking release signal, control the pressure valve to provide a third valve pressure to the second parking switch valve; the third valve pressure is greater than the first valve pressure;

[0198] a seventh hydraulic unit, configured to respond to receiving a sensor fault signal reported by the piston position sensor and, according to the parking release signal, provide a third oil pressure to the first parking switch valve through the first oil pipeline to move the parking piston toward the parking brake position, wherein the third oil pressure is greater than the first oil pressure;

[0199] The second vehicle state determination unit is used to determine that the vehicle is in a released parking state when the parking piston is located at the released parking position after a third preset time.

[0200] As a possible implementation, the hydraulic control system further includes a parking solenoid and a parking claw, and the device further includes:

[0201] a parking pawl control unit, configured to fix the parking piston in the unparking position by controlling the parking pawl in response to the parking piston moving to the unparking position;

[0202] a parking solenoid electronic control unit, for energizing the parking solenoid in response to the parking piston moving to the parking release position;

[0203] The fourth parking piston control unit is used to control the parking piston according to the magnetic force provided by the parking electromagnet being energized, so that the parking piston is fixed in the parking release position.

[0204] It can be seen from the above technical scheme that, in response to receiving the parking brake signal, the parking solenoid valve is energized to make the parking solenoid valve work in the first working state; the first working state is the working state in which the parking solenoid valve allows the hydraulic oil to flow through the parking solenoid valve through the first oil supply channel; the second parking switching valve is subjected to the second hydraulic pressure provided by the hydraulic oil in the first oil supply channel, and switches to the third working state; the third working state is the working state in which the hydraulic oil flows out of the parking piston cylinder through the second oil supply channel through the second parking switching valve; the hydraulic oil is extracted from the parking piston cylinder through the second oil supply channel; according to the first oil pressure provided to the parking piston when the hydraulic oil flows out of the parking piston cylinder, the parking piston moves to the parking brake position; the first oil pressure is the oil pressure that makes the parking piston move close to the cylinder bottom of the parking piston cylinder. The parking solenoid valve is powered on and off to control the on and off of the first oil pipeline, so that the hydraulic oil in the first oil pipeline provides controlled oil pressure to the second parking switch valve, so that when the parking brake signal is received, the hydraulic oil is discharged from the parking piston cylinder to put the vehicle into the parking brake state, thereby improving the vehicle's response speed to the driver's parking brake.

[0205] See also Figure 8 , Figure 8 The structural block diagram of a computer device for parking brake provided in an embodiment of the present application, the computer device includes a processor 810 and a memory 820:

[0206] The memory 820 is used to store program codes and transmit the program codes to the processor 810;

[0207] The processor 810 is used to execute the parking brake method described in any one of the above embodiments according to the instructions in the program code.

[0208] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, and when the computer program is executed by a processor, the computer program is used to execute the parking brake method described in any one of the above embodiments.

[0209] It should be noted that each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments. The device and system embodiments described above are merely schematic, in which the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0210] The above 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 that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application 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 parking brake method, characterized in that: A hydraulic control system applied to a vehicle, the hydraulic control system comprising hydraulic oil, a second parking switch valve, a first oil delivery channel, a second oil delivery channel, a parking solenoid valve, a parking piston cylinder and a parking piston, the method comprising: In response to receiving a parking brake signal, the parking solenoid valve is energized to make the parking solenoid valve work in a first working state; the first working state is a working state in which the parking solenoid valve makes the hydraulic oil flow through the parking solenoid valve through the first oil delivery channel; The second parking switch valve is switched to a third working state by the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel; the third working state is a working state in which the hydraulic oil flows out of the parking piston cylinder through the second oil delivery channel and the second parking switch valve; Delivering the hydraulic oil from the parking piston cylinder through the second oil delivery channel; The parking piston moves toward the parking brake position according to the first oil pressure provided to the parking piston when the hydraulic oil flows out of the parking piston cylinder; the first oil pressure is the oil pressure that causes the parking piston to move closer to the cylinder bottom of the parking piston cylinder.

2. The method according to claim 1, characterized in that The second parking switch valve includes a second return spring; The second parking switch valve is switched to a third working state by the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel, including: The second parking switch valve is subjected to the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel and the second spring force, so that the second parking switch valve switches to the third working state; the second spring force is the force provided by the second return spring to the second parking switch valve.

3. The method according to claim 1, characterized in that The hydraulic control system further includes a first parking switch valve, the second parking switch valve further includes a pressure valve, and the method further includes: In response to receiving a parking release signal, the parking solenoid valve is energized to make the parking solenoid valve work in the first working state; The first parking switch valve is switched to a fourth working state by the first hydraulic pressure provided by the hydraulic oil in the first oil delivery channel; the fourth working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the first parking switch valve; The second parking switch valve is switched to a second working state by the valve pressure provided by the pressure valve; the second working state is a working state in which the hydraulic oil flows into the parking piston cylinder through the second oil delivery channel and the second parking switch valve; Introducing the hydraulic oil into the parking piston cylinder through the second oil delivery channel; The parking piston moves toward the parking release position according to a second oil pressure provided to the parking piston when the hydraulic oil is introduced into the parking piston cylinder; the second oil pressure is an oil pressure that moves the parking piston away from the cylinder bottom of the parking piston cylinder.

4. The method according to claim 3, characterized in that The first parking solenoid valve further includes a first return spring; The first parking switch valve is switched to a fourth working state by the first hydraulic pressure provided by the hydraulic oil in the first oil delivery channel, including: The first parking switch valve is subjected to the first hydraulic pressure and the first spring force provided by the hydraulic oil in the first oil delivery channel, so that the first parking switch valve is switched to the fourth working state; the first spring force is the force provided by the first return spring to the first parking switch valve.

5. The method according to claim 3, characterized in that: After the parking piston moves toward the parking release position according to the second oil pressure provided to the parking piston when the hydraulic oil is introduced into the parking piston cylinder, the method further includes: In response to determining that the parking piston has not moved to the parking release position after a first preset time has passed, controlling the parking piston to move the parking piston toward the parking brake position; In response to determining that the parking piston moves to the parking brake position, providing a second valve pressure to the second parking switch valve by controlling the pressure valve; the second valve pressure is greater than the first valve pressure; In response to determining that the parking piston moves to the parking brake position, providing a third oil pressure to the first parking switch valve through the first oil delivery passage, wherein the third oil pressure is greater than the first oil pressure, so that the parking piston moves to the parking release position; After a second preset time, determining the current position of the parking piston; In response to the current position of the parking piston being the parking release position, it is determined that the vehicle is in a parking release state.

6. The method according to claim 5, characterized in that The method further comprises: In response to the current position of the parking piston being different from the parking release position, a parking release fault signal is issued.

7. The method according to claim 5, characterized in that The determining of the current position of the parking piston is performed by a piston position sensor; The method further comprises: In response to receiving a sensor fault signal reported by the piston position sensor, according to the parking release signal, by controlling the pressure valve, a third valve pressure is provided to the second parking switch valve; the third valve pressure is greater than the first valve pressure; In response to receiving a sensor fault signal reported by the piston position sensor, according to the parking release signal, a third oil pressure is provided to the first parking switch valve through the first oil pipeline to move the parking piston toward the parking brake position, wherein the third oil pressure is greater than the first oil pressure; After a third preset time, when the parking piston is located at the parking release position, it is determined that the vehicle is in a parking release state.

8. The method according to any one of claims 3 to 7, characterized in that: The hydraulic control system further includes a parking solenoid and a parking claw, and the method further includes: In response to the parking piston moving to the unparking position, fixing the parking piston in the unparking position by controlling the parking pawl; energizing the parking solenoid in response to the parking piston moving to the unparked position; The parking piston is controlled according to the magnetic force provided by the energization of the parking electromagnet so as to be fixed at the parking release position.

9. A parking brake device, characterized in that: A hydraulic control system applied to a vehicle, the hydraulic control system comprising hydraulic oil, a second parking switch valve, a first oil delivery channel, a second oil delivery channel, a parking solenoid valve, a parking piston cylinder and a parking piston, the device comprising: a first electronic control unit, configured to, in response to receiving a parking brake signal, energize the parking solenoid valve so that the parking solenoid valve operates in a first operating state; the first operating state is an operating state in which the parking solenoid valve causes the hydraulic oil to flow through the parking solenoid valve through the first oil delivery channel; a first hydraulic unit, configured to switch the second parking switch valve to a third working state when the second hydraulic pressure provided by the hydraulic oil in the first oil delivery channel is applied; the third working state is a working state in which the hydraulic oil flows out of the parking piston cylinder through the second oil delivery channel and the second parking switch valve; A hydraulic oil outlet unit, used to outlet the hydraulic oil from the parking piston cylinder through the second oil delivery channel; The first parking piston control unit is used to provide a first oil pressure to the parking piston when the hydraulic oil flows out of the parking piston cylinder, so that the parking piston moves toward the parking brake position; the first oil pressure is the oil pressure that causes the parking piston to move closer to the cylinder bottom of the parking piston cylinder.

10. A computer device, characterized in that: The computer device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the parking brake method according to any one of claims 1 to 8 according to the instructions in the program code.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and when the computer program is executed by a processor, the computer program is used to execute the parking brake method according to any one of claims 1 to 8.

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