A vehicle braking system, a vehicle, and a vehicle control method

Abstract

The present invention discloses a vehicle braking system, a vehicle and a vehicle control method, relating to the technical field of engineering vehicles. The vehicle braking system includes a servo cylinder, a brake, a brake valve, a variable pump, a travel motor, a servo valve and a pressure detection component. The servo cylinder controls the change of the swash plate angle of the variable pump to control the output flow rate of the variable pump. The brake is connected to the travel motor to control the braking of the travel motor. Hydraulic oil enters the brake through the brake valve to form a brake release oil circuit. The brake valve is used to control the connection or disconnection of the brake release oil circuit. The two servo oil ports of the servo cylinder are respectively and correspondingly connected to the two oil ports of the servo valve. The servo valve is used to control whether the oil chambers on both sides of the servo cylinder are connected. The pressure detection component is used to detect the pressure in the brake release oil circuit. The servo valve is configured to control the non-connection of the oil chambers on both sides of the servo cylinder when the pressure in the brake release oil circuit reaches the pressure for the complete opening of the brake. Only when the flow rate of the variable pump can be adjusted can the vehicle move.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering vehicles, and in particular to a vehicle braking system, a vehicle and a vehicle control method. Background Art

[0002] For a full-hydraulic roller, the swash plate angle of the hydraulic pump in the closed system is usually changed by operating the speed change handle, so as to realize driving braking and driving speed change, while the brake of the reducer or the drive axle is used as the parking brake.

[0003] Since the driving brake and the parking brake are controlled separately, during the vehicle starting process, there is a phenomenon that the parking brake is not released or not fully released, and the speed change handle is misoperated to control the roller to move, resulting in brake wear. In the prior art, an alarm device is set to send an alarm signal when the vehicle moves without the parking brake being fully released. However, due to reasons such as the operator's inattention, this situation cannot be effectively avoided. Summary of the Invention

[0004] The purpose of the present invention is to provide a vehicle braking system, a vehicle and a vehicle control method, so as to control whether the vehicle moves according to the actual release situation of the parking brake, and protect the brake to the greatest extent.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A vehicle braking system includes a servo oil cylinder, a brake, a brake valve, a variable pump, a travel motor and a servo valve. The servo oil cylinder controls the change of the swash plate angle of the variable pump to control the output flow of the variable pump; the brake is connected to the travel motor to control the braking of the travel motor, and hydraulic oil enters the brake through the brake valve to form a brake release oil circuit. The brake valve is used to control the connection and disconnection of the brake release oil circuit; two servo oil ports of the servo oil cylinder are connected to two oil ports of the servo valve in one-to-one correspondence, and the servo valve is used to control whether the oil chambers on both sides of the servo oil cylinder are connected; the vehicle braking system further includes a pressure detection component, and the pressure detection component is used to detect the pressure in the brake release oil circuit. The servo valve is configured to control the non-connection of the oil chambers on both sides of the servo oil cylinder when the pressure in the brake release oil circuit reaches the pressure at which the brake is fully opened, and the flow rate of the variable pump can be adjusted.

[0007] Optionally, the pressure detection component is a pressure sensor.

[0008] Optionally, the vehicle braking system further includes a pressure alarm. When the pressure detection component detects that the pressure in the brake release oil circuit is less than the pressure at which the brake is fully opened, the pressure alarm gives an alarm.

[0009] Optionally, the vehicle braking system further includes a voltage acquisition device for acquiring the voltage of the brake valve to determine whether the brake valve is connected to the brake release oil circuit; or,

[0010] The vehicle braking system further includes a current acquisition device for acquiring the current of the brake valve to determine whether the brake valve is connected to the brake release oil circuit.

[0011] Optionally, the vehicle braking system further includes a relay, and both the pressure detection member and the servo valve are electrically connected to the relay.

[0012] Optionally, the vehicle braking system further includes a hydraulic control valve for regulating the flow rates of the oil chambers on both sides of the servo cylinder.

[0013] Optionally, the vehicle braking system further includes a make-up oil pump. The brake valve is connected to the make-up oil pump, and the make-up oil pump supplies oil to the brake release oil circuit through the brake valve.

[0014] Optionally, a closed hydraulic circuit is formed between the variable pump and the travel motor. The two oil ports of the variable pump are respectively connected to the two oil ports of the travel motor in one-to-one correspondence through a first pipeline and a second pipeline;

[0015] The vehicle braking system further includes a make-up oil safety valve and a make-up oil overflow valve. The make-up oil pump is respectively connected to the first pipeline and the second pipeline in one-to-one correspondence through the two make-up oil safety valves, and the make-up oil overflow valve is connected to the fuel tank for overflow in the make-up oil circuit.

[0016] Optionally, the vehicle braking system further includes a flushing valve and a flushing overflow valve. The two oil ports of the flushing valve are respectively connected to the first pipeline and the second pipeline in one-to-one correspondence, and the flushing overflow valve is connected to the flushing valve and the fuel tank for overflow in the flushing circuit.

[0017] A vehicle includes the vehicle braking system according to any one of the above.

[0018] A vehicle control method for the vehicle includes the following steps:

[0019] Detect whether the pressure in the brake release oil circuit reaches the pressure at which the brake is fully opened through the pressure detection member. If so, the servo valve controls the oil chambers on both sides of the servo cylinder to be not connected, and the flow rate of the variable pump can be adjusted; if not, the servo valve controls the oil chambers on both sides of the servo cylinder to be connected, and the flow rate of the variable pump cannot be adjusted.

[0020] Optionally, when the pressure detection member detects that the pressure in the brake release oil circuit is less than the pressure at which the brake is fully opened, control the pressure alarm to give an alarm.

[0021] Optionally, before the step of detecting, by the pressure detecting member, whether the pressure in the brake release oil circuit reaches the pressure for completely opening the brake, and if so, the servo valve controls the oil chambers on both sides of the servo cylinder to be not communicated, and the flow rate of the variable pump can be adjusted; if not, the servo valve controls the oil chambers on both sides of the servo cylinder to be communicated, and the flow rate of the variable pump cannot be adjusted, the method further includes: collecting the voltage of the brake valve by a voltage collecting device, or collecting the current of the brake valve by a current collecting device, and determining whether the brake valve is communicated with the brake release oil circuit, and if so, proceeding to the next step; if not, the servo valve controls the oil chambers on both sides of the servo cylinder to be communicated, and the flow rate of the variable pump cannot be adjusted.

[0022] Advantages of the present invention:

[0023] The vehicle braking system provided by the present invention detects the pressure in the brake release oil circuit by arranging a pressure detecting member to determine whether the pressure in the brake release oil circuit meets the pressure for completely opening the brake. The servo valve is configured to control the oil chambers on both sides of the servo cylinder to be not communicated when the pressure in the brake release oil circuit reaches the pressure for completely opening the brake, and the flow rate of the variable pump can be adjusted, and then the vehicle can move. This vehicle braking system and the vehicle applying this braking system avoid the problem of damage to the drive axle or the speed reducer caused by the vehicle moving when the pressure in the brake release oil circuit is insufficient and the parking brake is not completely released, thus protecting the drive axle or the speed reducer.

[0024] The vehicle braking method provided by the present invention is applied to the above vehicle. According to the pressure in the brake release oil circuit, it is determined whether the brake is completely opened. When the brake is completely opened, the servo valve controls the oil chambers on both sides of the servo cylinder to be not communicated, and the flow rate of the variable pump can be adjusted, and then the vehicle can move and shift gears; otherwise, the flow rate of the variable pump cannot be adjusted, and the vehicle cannot move. This vehicle braking method can maximize the protection of the vehicle drive axle or the speed reducer. Description of the Drawings

[0025] Figure 1 is the working principle diagram of the vehicle braking system provided by the embodiment of the present invention;

[0026] Figure 2 is the flowchart of the vehicle control method provided by the embodiment of the present invention.

[0027] In the figure:

[0028] 1, variable pump; 2, servo cylinder; 3, hydraulic control valve; 4, makeup oil pump; 5, servo valve; 6, brake valve; 7, brake; 8, travel motor; 9, pressure sensor; 10, flushing valve; 11, makeup oil overflow valve; 12, flushing overflow valve; 13, makeup oil safety valve; 14, stop valve; 15, first pipeline; 16, second pipeline. Detailed Embodiments

[0029] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals designate like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0031] Unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal level than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal level than the second feature.

[0033] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0034] As Figure 1As shown in the figure, this embodiment provides a vehicle braking system, including a servo oil cylinder 2, a brake 7, a brake valve 6, a variable pump 1, a travel motor 8, a servo valve 5, a hydraulic control valve 3, and a makeup oil pump 4. The servo oil cylinder 2 controls the swash plate angle change of the variable pump 1 to control the output flow of the variable pump 1; the brake 7 is connected to the travel motor 8 to control the braking of the travel motor 8. The hydraulic oil enters the brake 7 through the brake valve 6 to form a brake release oil circuit, and the brake valve 6 is used to control the connection or disconnection of the brake release oil circuit. The two servo oil ports of the servo oil cylinder 2 are correspondingly connected to the two oil ports of the servo valve 5, and the servo valve 5 is used to control whether the oil chambers on both sides of the servo oil cylinder 2 are connected. By operating the shift lever, the hydraulic control valve 3 can adjust the flow rate of the oil chambers on both sides of the servo oil cylinder 2.

[0035] Optionally, a closed hydraulic circuit is formed between the variable pump 1 and the travel motor 8. The two oil ports of the variable pump 1 are respectively and correspondingly connected to the two oil ports of the travel motor 8 through a first pipeline 15 and a second pipeline 16. The vehicle braking system further includes a makeup oil safety valve 13, a makeup oil overflow valve 11, and a makeup oil pump 4. The makeup oil pump 4 is respectively and correspondingly connected to the first pipeline 15 and the second pipeline 16 through two makeup oil safety valves 13. The makeup oil overflow valve 11 is connected to the fuel tank and is used for overflow in the makeup oil circuit. In the closed hydraulic circuit, when the hydraulic oil in the first pipeline 15 (or the second pipeline 16) is low-pressure hydraulic oil, the hydraulic oil is pumped into the first pipeline 15 (or the second pipeline 16) through the makeup oil pump 4 and the corresponding makeup oil safety valve 13. When the pressure in the makeup oil circuit is relatively high, the hydraulic oil can overflow to the fuel tank through the makeup oil overflow valve 11.

[0036] Preferably, in the closed hydraulic circuit, a shut-off valve 14 for controlling the connection or disconnection of the first pipeline 15 and the second pipeline 16 is further included. When towing a trailer, the vehicle does not require power output. The shut-off valve 14 is closed, connecting the first pipeline 15 and the second pipeline 16. The hydraulic oil flows out from one oil port of the variable pump 1, passes through the shut-off valve 14, and then flows back to the variable pump 1 from the other oil port.

[0037] Optionally, the vehicle braking system further includes a flushing valve 10 and a flushing overflow valve 12. The two oil ports of the flushing valve 10 are respectively and correspondingly connected to the first pipeline 15 and the second pipeline 16. The flushing overflow valve 12 is connected to the flushing valve 10 and the fuel tank and is used for overflow in the flushing circuit. The flushing valve 10 is used to flush the first pipeline 15 and the second pipeline 16. When the pressure in the flushing circuit is relatively high, the hydraulic oil can overflow to the fuel tank through the flushing overflow valve 12.

[0038] In this embodiment, the servo valve 5 is a servo solenoid valve. When the servo solenoid valve is de-energized, the hydraulic control valve 3 is in the neutral position. The oil chambers on both sides of the servo cylinder 2 are connected and communicate with the fuel tank, and the pressures in the two oil chambers are the same. Whether or not the speed change handle is operated, the output flow rate of the variable pump 1 does not change, and the vehicle cannot move. When the servo solenoid valve is energized, the oil chambers on both sides of the servo cylinder 2 are not connected, and the flow rate of the variable pump 1 can be adjusted, and then the vehicle can move.

[0039] The brake valve 6 is connected to the auxiliary oil pump 4, and the auxiliary oil pump 4 supplies oil to the brake release oil circuit through the brake valve 6. When it is necessary to release the parking brake, the brake valve 6 closes, connecting the brake release oil circuit. The hydraulic oil enters the brake 7 from the auxiliary oil pump 4 through the brake valve 6 to open the brake 7 and release the brake on the travel motor 8.

[0040] Since there is a problem that the pressure in the brake release oil circuit is insufficient during the process of releasing the brake, resulting in the brake 7 not being fully opened and then the speed change handle is operated to control the vehicle to move. The vehicle brake system provided in this embodiment further includes a pressure detection component, which is used to detect the pressure in the brake release oil circuit. The servo valve 5 is configured to control the oil chambers on both sides of the servo cylinder 2 not to be connected when the pressure in the brake release oil circuit reaches the pressure at which the brake 7 is fully opened, and the flow rate of the variable pump 1 can be adjusted. It should be noted that the pressure at which the brake 7 is fully opened is related to the parameters of the brake 7 and is not specifically limited here.

[0041] By setting the pressure detection component to detect the pressure in the brake release oil circuit to determine whether the pressure in the brake release oil circuit meets the pressure at which the brake 7 is fully opened, the servo valve 5 is configured to control the oil chambers on both sides of the servo cylinder 2 not to be connected when the pressure in the brake release oil circuit reaches the pressure at which the brake 7 is fully opened, and the flow rate of the variable pump 1 can be adjusted, and then the vehicle can move. This vehicle brake system avoids the problem of damage to the drive axle or reduction gear caused by the vehicle moving when the parking brake is not fully released due to insufficient pressure in the brake release oil circuit, and protects the drive axle or reduction gear.

[0042] Preferably, the pressure detection component is a pressure sensor 9. The pressure in the brake release oil circuit is detected by the pressure sensor 9. Only when the pressure collected by the pressure sensor 9 is greater than or equal to the pressure at which the brake 7 is fully opened, the servo valve 5 is energized to control the oil chambers on both sides of the servo cylinder 2 not to be connected, and the flow rate of the variable pump 1 can be adjusted, and the vehicle can move; otherwise, the servo valve 5 is de-energized to control the oil chambers on both sides of the servo cylinder 2 to be connected, and the flow rate of the variable pump 1 cannot be adjusted, and the vehicle cannot move.

[0043] Optionally, the vehicle brake system further includes a relay, and both the pressure detection component and the servo valve 5 are electrically connected to the relay. The relay controls the servo valve 5 to be energized according to the signal received from the pressure sensor 9 to realize the variable displacement of the variable pump 1.

[0044] In another alternative embodiment of the present invention, the vehicle braking system further includes a pressure alarm and a controller. When the pressure detection component detects that the pressure in the brake release oil circuit is less than the pressure at which the brake 7 is fully opened, the pressure alarm gives an alarm. Both the pressure sensor 9 and the pressure alarm are electrically connected to the controller. When the pressure sensor 9 detects that the pressure in the brake release oil circuit is less than the pressure at which the brake 7 is fully opened, it sends a signal to the controller. After receiving the signal, the controller controls the pressure alarm to give an alarm. The operator is reminded by the pressure alarm that the pressure in the brake release oil circuit is insufficient and the brake 7 is not fully opened, so as to inform the operator of the reason why the vehicle cannot move and to take corresponding measures to solve it. It should be noted that the connection method and working principle of the controller with the pressure sensor 9 and the pressure alarm are already in the prior art and will not be elaborated here.

[0045] Due to reasons such as electrical faults, when the operator has pressed the parking brake release switch, but the brake valve 6 is not connected to the brake release oil circuit and the parking brake is not actually released, if the operator operates the gearshift lever at this time, it will also cause damage to the drive axle or the reduction gear. The vehicle braking system provided in this embodiment further includes a voltage acquisition device for acquiring the voltage of the brake valve 6 to determine whether the brake valve 6 is connected to the brake release oil circuit. In this embodiment, the brake valve 6 is a solenoid valve, and when the brake valve 6 is energized, the brake release oil circuit is connected. First, it is determined whether the brake valve 6 is energized. If the voltage acquired by the voltage acquisition device reaches the voltage target value, then the brake valve 6 is energized, and then the pressure in the brake release oil circuit is detected; if the voltage acquired by the voltage acquisition device does not reach the voltage target value, then the brake valve 6 is not energized, then the servo valve 5 is not energized, and the oil chambers on both sides of the servo cylinder 2 are connected, and the flow rate of the variable pump 1 cannot be adjusted. The operator needs to check the reason why the brake valve 6 is not energized and repair it. Of course, in other embodiments, the vehicle braking system includes a current acquisition device, and the current of the brake valve 6 is acquired by the current acquisition device, and the current of the brake valve 6 acquired by the current acquisition device is compared with the target current value, and it can also be determined whether the brake valve 6 is connected to the brake release oil circuit. It should be noted that the voltage target value and the current target value are determined by the parameters of the brake valve 6 and are not limited here.

[0046] This embodiment also provides a vehicle, including the above-mentioned vehicle braking system. In this embodiment, the vehicle is a road roller, and this road roller can determine whether the brake 7 is connected to the brake release oil circuit according to the voltage acquired by the voltage acquisition device, and determine whether the brake 7 is fully opened according to the pressure sensor 9, avoiding the problem of damage to the drive axle or the reduction gear caused by the vehicle moving when the parking brake is not released or not fully released, and protecting the drive axle or the reduction gear. Of course, in other embodiments, the vehicle can also be other engineering vehicles.

[0047] This embodiment also provides a vehicle control method, and this vehicle control method can be used for the above-mentioned vehicle.

[0048] As Figure 2 shown, the vehicle control method provided in this embodiment is applied to a roller, and includes the following steps:

[0049] S10. Operate the shift lever.

[0050] By operating the shift lever, a signal is given to the variable pump 1 to control the vehicle to move. To avoid wear of the brake 7 caused by the parking brake not being released or not being fully released, it is necessary to judge whether the brake valve 6 is connected to the brake release oil circuit and whether the pressure in the brake release oil circuit reaches the pressure at which the brake valve 6 is fully opened, so as to ensure that the parking brake is fully released before the vehicle can be controlled to move.

[0051] S20. Collect the voltage of the brake valve 6 through a voltage acquisition device, and judge whether the brake valve 6 is connected to the brake release oil circuit. If so, proceed to the next step; if not, the servo valve 5 controls the two oil chambers on both sides of the servo cylinder 2 to communicate, and the flow rate of the variable pump 1 cannot be adjusted.

[0052] By collecting the voltage of the brake valve 6, judge whether the brake valve 6 is powered on. If the brake valve 6 is not powered on, remind the operator to repair the circuit of the brake valve 6 to eliminate the circuit fault.

[0053] Of course, in other embodiments, the current of the brake valve 6 can also be collected through a current acquisition device, and whether the brake valve 6 is powered on can be judged through the current.

[0054] S30. Detect through a pressure detection component whether the pressure in the brake release oil circuit reaches the pressure at which the brake 7 is fully opened. If so, the servo valve 5 controls the two oil chambers on both sides of the servo cylinder 2 not to communicate, and the flow rate of the variable pump 1 can be adjusted; if not, the servo valve 5 controls the two oil chambers on both sides of the servo cylinder 2 to communicate, and the flow rate of the variable pump 1 cannot be adjusted.

[0055] When the pressure detected by the pressure sensor 9 reaches the pressure at which the brake 7 is fully opened, the relay controls the servo valve 5 to be powered on, the two oil chambers on both sides of the servo cylinder 2 do not communicate, the flow rate of the variable pump 1 can be adjusted, and the vehicle can move.

[0056] In another optional embodiment of the present invention, when the pressure detection component detects that the pressure in the brake release oil circuit is less than the pressure at which the brake 7 is fully opened, the controller controls the pressure alarm to alarm, so as to remind the operator that the pressure in the brake release oil circuit is insufficient and the vehicle cannot move.

[0057] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A vehicle braking system, comprising a servo oil cylinder (2), a brake (7), a brake valve (6), a variable pump (1), a travel motor (8) and a servo valve (5). The servo oil cylinder (2) controls the swash plate angle change of the variable pump (1) to control the output flow rate of the variable pump (1); the brake (7) is connected to the travel motor (8) to control the braking of the travel motor (8), and hydraulic oil enters the brake (7) through the brake valve (6) to form a brake release oil circuit, and the brake valve (6) is used to control the connection or disconnection of the brake release oil circuit; the two servo oil ports of the servo oil cylinder (2) are connected to the two oil ports of the servo valve (5) in one-to-one correspondence, and the servo valve (5) is used to control whether the oil chambers on both sides of the servo oil cylinder (2) are connected; characterized in that, The vehicle braking system further includes a pressure detection component for detecting the pressure in the brake release oil circuit. The servo valve (5) is configured to control the non-communication of the oil chambers on both sides of the servo oil cylinder (2) when the pressure in the brake release oil circuit reaches the pressure at which the brake (7) is fully opened, and the flow rate of the variable pump (1) can be adjusted; The vehicle braking system further includes a voltage acquisition device for acquiring the voltage of the brake valve (6) to determine whether the brake valve (6) communicates with the brake release oil circuit. The voltage acquisition device is configured to acquire the voltage of the brake valve (6) before the pressure detection component detects the pressure in the brake release oil circuit; or, The vehicle braking system further includes a current acquisition device for acquiring the current of the brake valve (6) to determine whether the brake valve (6) communicates with the brake release oil circuit. The current acquisition device is configured to acquire the current of the brake valve (6) before the pressure detection component detects the pressure in the brake release oil circuit.

2. The vehicle braking system according to claim 1, characterized in that, The pressure detection component is a pressure sensor (9).

3. The vehicle braking system according to claim 1, characterized in that, The vehicle braking system further includes a pressure alarm. When the pressure detection component detects that the pressure in the brake release oil circuit is less than the pressure at which the brake (7) is fully opened, the pressure alarm gives an alarm.

4. The vehicle braking system according to claim 1, wherein, The vehicle braking system further includes a relay. The pressure detection component and the servo valve (5) are both electrically connected to the relay.

5. The vehicle braking system according to any one of claims 1-4, characterized in that, The vehicle braking system further includes a hydraulic control valve (3) for adjusting the flow rate of the oil chambers on both sides of the servo oil cylinder (2).

6. The vehicle braking system according to any one of claims 1-4, characterized in that, The vehicle braking system further includes a makeup oil pump (4). The brake valve (6) is connected to the makeup oil pump (4), and the makeup oil pump (4) supplies oil to the brake release oil circuit through the brake valve (6).

7. The vehicle braking system according to claim 6, characterized in that, A closed hydraulic circuit is formed between the variable pump (1) and the travel motor (8). The two oil ports of the variable pump (1) are respectively connected to the two oil ports of the travel motor (8) in one-to-one correspondence through a first pipeline (15) and a second pipeline (16); The vehicle braking system further includes a makeup oil safety valve (13) and a makeup oil overflow valve (11). The makeup oil pump (4) is respectively connected to the first pipeline (15) and the second pipeline (16) in one-to-one correspondence through the two makeup oil safety valves (13). The makeup oil overflow valve (11) is connected to the fuel tank and is used for overflow in the makeup oil circuit.

8. The vehicle braking system according to claim 7, characterized in that, The vehicle braking system further includes a flushing valve (10) and a flushing overflow valve (12). The two oil ports of the flushing valve (10) are respectively connected to the first pipeline (15) and the second pipeline (16) in one-to-one correspondence. The flushing overflow valve (12) is connected to the flushing valve (10) and the fuel tank and is used for overflow in the flushing circuit.

9. A vehicle, characterized in that, It includes the vehicle braking system according to any one of claims 1-8.

10. A vehicle control method for a vehicle as claimed in claim 9, characterized in that, It includes the following steps: The pressure detection component is used to detect whether the pressure in the brake release oil circuit reaches the pressure at which the brake (7) is fully opened. If so, the servo valve (5) controls the non-communication of the oil chambers on both sides of the servo cylinder (2), and the flow rate of the variable pump (1) can be adjusted; if not, the servo valve (5) controls the communication of the oil chambers on both sides of the servo cylinder (2), and the flow rate of the variable pump (1) cannot be adjusted.

11. The vehicle control method according to claim 10, characterized in that, When the pressure detection component detects that the pressure in the brake release oil circuit is less than the pressure at which the brake (7) is fully opened, the pressure alarm is controlled to give an alarm.

12. The vehicle control method according to claim 10, wherein, Before the step of using the pressure detection component to detect whether the pressure in the brake release oil circuit reaches the pressure at which the brake (7) is fully opened, if so, the servo valve (5) controls the non-communication of the oil chambers on both sides of the servo cylinder (2), and the flow rate of the variable pump (1) can be adjusted; if not, the servo valve (5) controls the communication of the oil chambers on both sides of the servo cylinder (2), and the flow rate of the variable pump (1) cannot be adjusted, it also includes: collecting the voltage of the brake valve (6) through a voltage acquisition device, or collecting the current of the brake valve (6) through a current acquisition device, and judging whether the brake valve (6) is connected to the brake release oil circuit. If so, the next step is carried out; if not, the servo valve (5) controls the communication of the oil chambers on both sides of the servo cylinder (2), and the flow rate of the variable pump (1) cannot be adjusted.

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