Vehicle braking system and vehicle

Abstract

The present application relates to the technical field of brake systems, and in particular to a brake system of a vehicle and a vehicle. The brake system of the vehicle includes a hydraulic pump, an energy storage tank and an electro-hydraulic servo valve; an electro-hydraulic servo valve is arranged between the energy storage tank and the brake line; the energy storage tank includes a high-pressure oil chamber and a low-pressure oil chamber, the oil inlet of the electro-hydraulic servo valve is connected to the high-pressure oil chamber, and the oil outlet of the electro-hydraulic servo valve is connected to the low-pressure oil chamber; the servo port of the electro-hydraulic servo valve is connected to the brake line; the pump shaft of the hydraulic pump is connected to the output shaft of the transmission; the oil inlet of the hydraulic pump is connected to the low-pressure oil chamber; a linkage mechanism is arranged between the servo port of the electro-hydraulic servo valve and the low-pressure oil chamber, and the hydraulic oil in the low-pressure oil chamber can be pushed to the oil inlet of the hydraulic pump by the linkage mechanism; the oil outlet of the hydraulic pump is connected to the high-pressure oil chamber; the electro-hydraulic servo valve is connected to the vehicle's controller, and the controller can control the action of the electro-hydraulic servo valve according to the brake signal. The brake system of the present application is more energy-saving and has a wider range of applications.

Description

Technical Field

[0001] The present application relates to the technical field of brake systems, and in particular to a brake system of a vehicle and a vehicle. Background Art

[0002] The traditional brake booster solution for fuel vehicles uses a vacuum booster, which is based on the natural advantage of the engine generating a vacuum source.

[0003] Electric vehicles are driven by motors, eliminating the traditional engine and thus losing the vacuum source. The current solution generally uses an electric vacuum pump solution, which uses the car battery to drive the electric vacuum pump to generate a vacuum source, which is stored in a vacuum tank and transferred to the vacuum booster to reduce the driver's pedal force, and then transfer the force to the brake pipe system to achieve vehicle braking.

[0004] The braking power of the above solution comes from the on-board electric energy, which is not conducive to energy recovery and energy saving and emission reduction. Summary of the invention

[0005] The purpose of the present application is to provide a vehicle braking system and a vehicle, which utilizes the reverse drag of the wheels during braking to achieve braking of the vehicle, thereby being more energy-efficient.

[0006] The present application provides a vehicle braking system, including a hydraulic pump, an energy storage tank and an electro-hydraulic servo valve;

[0007] The electro-hydraulic servo valve is arranged between the energy storage tank and the brake pipeline of the vehicle;

[0008] The energy storage oil tank comprises a high-pressure oil chamber and a low-pressure oil chamber, the oil inlet of the electro-hydraulic servo valve is communicated with the high-pressure oil chamber, and the oil outlet of the electro-hydraulic servo valve is communicated with the low-pressure oil chamber; the servo port of the electro-hydraulic servo valve is communicated with the brake pipeline;

[0009] The pump shaft of the hydraulic pump is connected to the output shaft of the transmission of the vehicle; the oil inlet of the hydraulic pump is communicated with the low-pressure oil chamber; a linkage mechanism is provided between the servo port of the electro-hydraulic servo valve and the low-pressure oil chamber, and the hydraulic oil in the low-pressure oil chamber can be pushed to the oil inlet of the hydraulic pump by the linkage mechanism; the oil outlet of the hydraulic pump is communicated with the high-pressure oil chamber;

[0010] The electro-hydraulic servo valve is communicatively connected to a controller of the vehicle, and the controller can control the action of the electro-hydraulic servo valve according to a brake signal.

[0011] In the above technical solution, further, it also includes a pedal brake device located between the servo port of the electro-hydraulic servo valve and the brake pipeline;

[0012] The pedal brake device comprises a brake pedal, a hydraulic booster and a brake master cylinder. The servo port of the electro-hydraulic servo valve is communicated with the hydraulic booster, and the brake master cylinder is communicated with the brake pipeline.

[0013] In the above technical solution, further, a pedal travel sensor is provided on the brake pedal, and the pedal travel sensor is communicatively connected with the controller.

[0014] In the above technical solution, further, it also includes an anti-lock braking system and / or a vehicle body electronic stability system arranged in the brake pipeline.

[0015] In the above technical solution, further, the hydraulic pump is a gear pump.

[0016] In the above technical solution, further, an elastic member and a piston are provided in the high-pressure oil chamber, and the piston separates the cavity of the high-pressure oil chamber into a first cavity and a second cavity;

[0017] The elastic member is located in the first cavity, and the elastic member applies a force to the piston to move toward the second cavity, and the first cavity is provided with a vent hole;

[0018] The second cavity is communicated with the oil inlet of the electro-hydraulic servo valve and the oil outlet of the hydraulic pump.

[0019] In the above technical solution, further, a seal is provided between the side wall of the high-pressure oil chamber and the piston.

[0020] In the above technical solution, further, a telescopic diaphragm is arranged in the low-pressure oil chamber, and the telescopic diaphragm divides the low-pressure oil chamber into a third cavity and a fourth cavity;

[0021] The linkage mechanism is located in the third cavity, and the linkage mechanism can push the telescopic diaphragm to change the liquid level of the hydraulic oil in the fourth cavity;

[0022] The fourth cavity is communicated with the oil outlet of the electro-hydraulic servo valve and the oil inlet of the hydraulic pump.

[0023] In the above technical solution, further, a one-way valve is provided between the oil outlet of the hydraulic pump and the high-pressure oil chamber, so that the hydraulic oil can flow to the high-pressure oil chamber in one direction.

[0024] The present application also provides a vehicle, comprising the braking system of the vehicle described in the above solution.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] The vehicle braking system provided by the present application utilizes the reverse drag of the wheels to achieve braking of the vehicle during braking, which saves more energy. The hydraulic oil medium, as a power transmission medium, can transmit greater pressure. The braking system can be used as a brake booster or in an unmanned driving active braking system.

[0027] The present application also provides a vehicle, including the braking system of the vehicle described in the above solution. Based on the above analysis, it can be seen that the vehicle also has the above beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A first structural schematic diagram of a vehicle braking system provided in the present application;

[0030] Figure 2 A second structural schematic diagram of the braking system of the vehicle provided in this application;

[0031] Figure 3 A schematic diagram of a first cross-sectional structure of the energy storage tank provided in the present application;

[0032] Figure 4 This is a second cross-sectional structural schematic diagram of the energy storage tank provided in this application.

[0033] In the figure: 101-hydraulic pump; 102-energy storage oil tank; 103-electro-hydraulic servo valve; 104-high-pressure oil chamber; 105-low-pressure oil chamber; 106-oil inlet of electro-hydraulic servo valve; 107-oil outlet of electro-hydraulic servo valve; 108-servo port; 109-transmission; 110-oil inlet of hydraulic pump; 111-linkage mechanism; 112-controller; 113-pedal braking device; 114-brake pedal; 115-hydraulic booster; 116-brake master cylinder; 117-brake pipeline; 118-pedal travel sensor; 119-anti-lock braking system; 120-electronic vehicle stability system; 121-elastic member; 122-piston; 123-first cavity; 124-second cavity; 125-vent; 126-seal; 127-telescopic diaphragm; 128-third cavity; 129-fourth cavity. DETAILED DESCRIPTION

[0034] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application 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 therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Embodiment 1

[0038] See also Figures 1 to 4 As shown, the braking system of the vehicle provided in the present application includes a hydraulic pump 101, an energy storage tank 102 and an electro-hydraulic servo valve 103; the energy storage tank 102 includes a high-pressure oil chamber 104 and a low-pressure oil chamber 105. It should be noted that the "high pressure" of the high-pressure oil chamber 104 is higher than the oil pressure in the low-pressure oil chamber, and the "low pressure" of the low-pressure oil chamber 105 is lower than the oil pressure in the high-pressure oil chamber. The "high pressure" and "low pressure" in the present application are relative concepts.

[0039] An electro-hydraulic servo valve 103 is provided between the energy storage oil tank 102 and the brake pipeline 117 of the vehicle; the oil inlet 106 of the electro-hydraulic servo valve is connected to the high-pressure oil chamber 104, and the oil outlet 107 of the electro-hydraulic servo valve is connected to the low-pressure oil chamber 105; the servo port 108 of the electro-hydraulic servo valve 103 is connected to the brake pipeline 117;

[0040] The pump shaft of the hydraulic pump 101 is connected to the output shaft of the vehicle's transmission 109; the oil inlet 110 of the hydraulic pump is connected to the low-pressure oil chamber 105; a linkage mechanism 111 is provided between the servo port 108 of the electro-hydraulic servo valve 103 and the low-pressure oil chamber 105, and the hydraulic oil in the low-pressure oil chamber 105 can be pushed to the oil inlet 110 of the hydraulic pump by the linkage mechanism 111; the oil outlet of the hydraulic pump 101 is connected to the high-pressure oil chamber 104;

[0041] The control module of the electro-hydraulic servo valve 103 is in communication connection with the controller 112 of the vehicle, and the controller 112 can control the action of the electro-hydraulic servo valve 103 according to the brake signal.

[0042] Specifically, the pump shaft of the hydraulic pump 101 is connected to the output shaft (i.e., shaft II) of the vehicle's transmission 109, and is used to pressurize the hydraulic oil in the low-pressure oil chamber 105 and deliver it to the high-pressure oil chamber 104. During the operation of the vehicle, the output shaft of the vehicle's transmission 109 rotates to drive the hydraulic pump 101 to operate.

[0043] When the vehicle is just started, the hydraulic pump 101 pumps a large amount of hydraulic oil from the low-pressure oil chamber 105 into the high-pressure oil chamber 104 to establish the oil pressure in the high-pressure oil chamber 104. The high-pressure oil chamber 104 stores the energy provided by the hydraulic pump 101 and provides real-time kinetic energy to the system to ensure the follow-up state of the brake.

[0044] The oil inlet 106 of the electro-hydraulic servo valve is connected to the high-pressure oil chamber 104, and the oil outlet 107 of the electro-hydraulic servo valve is connected to the low-pressure oil chamber 105. When there is no signal input to the electro-hydraulic servo valve 103, the hydraulic oil entering the electro-hydraulic servo valve 103 from the high-pressure oil chamber 104 directly flows into the low-pressure oil chamber 105 from the oil outlet, and there is no oil pressure output from the servo port 108 of the electro-hydraulic servo valve 103. Since the oil flow rate flowing back to the low-pressure oil chamber 105 is less than the speed at which the oil pump pumps out the hydraulic oil from the low-pressure oil chamber 105, the hydraulic oil consumption of the high-pressure oil chamber 104 is very small, the oil volume of the low-pressure oil chamber 105 is reduced, and the hydraulic pump 101 is mostly in an idling state, which is more energy-efficient.

[0045] The electro-hydraulic servo valve 103 is connected to the vehicle controller 112 for communication. When the electro-hydraulic servo valve 103 receives the brake signal sent by the controller 112, the valve core is offset so that the servo port 108 outputs oil pressure, and the oil pressure output by the electro-hydraulic servo valve 103 is proportional to the brake signal. Under the action of oil pressure, the linkage mechanism 111 set between the servo port 108 of the electro-hydraulic servo valve 103 and the low-pressure oil chamber 105 can push the hydraulic oil in the low-pressure oil chamber 105 to the oil inlet 110 of the hydraulic pump. At this time, the rotation of the gearbox is driven by the back drag of the wheel. Under the action of the back drag force of the wheel, the hydraulic pump 101 pumps more hydraulic oil at the oil inlet into the high-pressure oil chamber 104 (pressurizing the high-pressure oil chamber 104), thereby increasing the oil pressure at the servo port 108. The servo port 108 is connected to the brake line 117 to achieve hydraulic braking. As a power transmission medium, the hydraulic oil medium can transmit a pressure far greater than the pressure generated by the vacuum source.

[0046] The vehicle braking system provided by the present application utilizes the reverse drag of the wheels to achieve braking of the vehicle during braking, which saves more energy. The hydraulic oil medium, as a power transmission medium, can transmit greater pressure. The braking system can be used as a brake booster or in an unmanned driving active braking system.

[0047] In an optional scheme of this embodiment, the vehicle's braking system also includes a pedal braking device 113 located between the servo port 108 of the electro-hydraulic servo valve 103 and the brake line 117; the pedal braking device 113 includes a brake pedal 114, a hydraulic booster 115 and a brake master cylinder 116, the servo port 108 of the electro-hydraulic servo valve 103 is connected to the hydraulic booster 115, and the brake master cylinder 116 is connected to the brake line 117.

[0048] In this embodiment, when the driver steps on the brake pedal 114, the hydraulic booster 115 presses toward the brake master cylinder 116 to allow the pressurized hydraulic oil to flow to the brake line 117 to achieve artificial braking. Combined with the braking boost provided by the oil pressure output by the electro-hydraulic servo valve 103, timely braking of the vehicle can be achieved.

[0049] In an optional solution of this embodiment, a pedal travel sensor 118 is further provided on the brake pedal 114 , and the pedal travel sensor 118 is communicatively connected with the controller 112 .

[0050] In this embodiment, the brake signal output by the controller 112 to the electro-hydraulic servo valve 103 may come from a pedal travel sensor 118 at the brake pedal 114; for an unmanned vehicle, the brake signal may also come from multiple sensors, which sense the surrounding environment of the vehicle and output a brake signal to the electro-hydraulic servo valve 103 based on the data (such as roads, vehicle position, obstacles, etc.) obtained through the perception after being processed by the controller 112.

[0051] An optional solution of this embodiment further includes an anti-lock braking system 119 and / or a vehicle body electronic stability system 120 disposed in the brake line 117 .

[0052] In this embodiment, when the car brakes, the anti-lock braking system 119 can automatically control the braking force of the brakes so that the wheels are not locked and are in a state of rolling and sliding (slip rate is about 20%) to ensure that the adhesion between the wheels and the ground is at the maximum value. The body electronic stability system 120 analyzes the vehicle driving state information transmitted from various sensors, and then sends correction instructions to ABS (antilock brake system, anti-lock braking system 119), EBD (Electronic Brakeforce Distribution), etc. to help the vehicle maintain dynamic balance. The body electronic stability system 120 can keep the vehicle in the best stability under various conditions, and the effect is more obvious in the case of oversteering or understeering.

[0053] In an optional solution of this embodiment, the hydraulic pump 101 is a gear pump, specifically a small gear pump connected to the gearbox or the output shaft of the reducer. The small pump has very little energy consumption, which further saves energy.

[0054] Embodiment 2

[0055] The braking system of the vehicle in the second embodiment is an improvement on the above embodiment, and the technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in the second embodiment.

[0056] See also Figure 3 and Figure 4 As shown, in an optional scheme of this embodiment, an elastic member 121 and a piston 122 are provided in the high-pressure oil chamber 104, and the piston 122 divides the cavity of the high-pressure oil chamber 104 into a first cavity 123 and a second cavity 124; the elastic member 121 is located in the first cavity 123, and the elastic member 121 applies a force to the piston 122 to move toward the second cavity 124, and the first cavity 123 is provided with a vent hole 125; the second cavity 124 is connected to the oil inlet 106 of the electro-hydraulic servo valve and the oil outlet of the hydraulic pump 101.

[0057] In this embodiment, the elastic member 121 (specifically a spring as shown in the figure) and the piston 122 provided in the high-pressure oil chamber 104 enable the energy output by the hydraulic pump 101 to be stored in the second cavity 124 of the high-pressure oil chamber 104; the oil pressure in the second cavity 124 is determined by the elastic force of the elastic member 121, and when the hydraulic oil presses the piston 122 toward the first cavity 123, the air in the first cavity 123 is discharged through the vent 125.

[0058] The low-pressure oil chamber 105 does not need to store pressure, so the pressure of the low-pressure oil chamber 105 can be atmospheric pressure. Optionally, the vent hole 125 connects the first cavity 123 and the low-pressure oil chamber 105 .

[0059] In an optional solution of this embodiment, a seal 126 is provided between the side wall of the high-pressure oil chamber 104 and the piston 122 to prevent the hydraulic oil from leaking to the first cavity 123 and causing oil pressure loss.

[0060] In an optional scheme of this embodiment, a telescopic diaphragm 127 is provided in the low-pressure oil chamber 105, and the telescopic diaphragm 127 divides the low-pressure oil chamber 105 into a third cavity 128 and a fourth cavity 129; the linkage mechanism 111 is located in the third cavity 128, and the linkage mechanism 111 can push the telescopic diaphragm 127 to change the liquid level of the hydraulic oil in the fourth cavity 129; the fourth cavity 129 is connected to the oil outlet 107 of the electro-hydraulic servo valve and the oil inlet 110 of the hydraulic pump.

[0061] In this embodiment, the telescopic diaphragm 127 separates the low-pressure oil chamber 105 into a third cavity 128 and a fourth cavity 129, wherein the fourth cavity 129 stores hydraulic oil under atmospheric pressure, and the fourth cavity 129 is the inner side of the telescopic diaphragm 127. A linkage mechanism 111 is provided on the outer side of the telescopic diaphragm 127, i.e., in the third cavity 128. When the servo port 108 outputs oil pressure, the linkage mechanism 111 pushes the telescopic diaphragm 127, thereby raising the liquid level of the hydraulic oil on the inner side of the telescopic diaphragm 127, so that a large amount of hydraulic oil can be pushed to the oil inlet 110 of the hydraulic pump.

[0062] Specifically, the linkage mechanism 111 includes a push rod, a lever and a pushing piece. The middle part of the lever is hinged to the third cavity 128, one end of the lever is hinged to the push rod, and the other end of the lever is hinged to the pushing piece. A channel is opened on the side wall of the low-pressure oil chamber 105, one side of the channel is connected to the servo port, the push rod is located in the channel, and the oil pressure at the servo port can drive the push rod to move, thereby driving the pushing piece to move, thereby lifting the telescopic diaphragm 127.

[0063] In an optional solution of this embodiment, a one-way valve is provided between the oil outlet of the hydraulic pump 101 and the high-pressure oil chamber 104 to allow the hydraulic oil to flow to the high-pressure oil chamber 104 in one direction, thereby preventing the hydraulic oil from flowing back to the low-pressure oil tank, thereby ensuring the stability of the oil pressure in the high-pressure oil tank.

[0064] Embodiment 3

[0065] Embodiment 3 of the present application provides a vehicle, including the braking system of the vehicle of any of the above embodiments, and thus has all the beneficial technical effects of the braking system of the vehicle of any of the above embodiments, which will not be repeated here.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In addition, a person skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present application and forming different embodiments.

Claims

1. A braking system for a vehicle, characterized in that: It includes a hydraulic pump, an energy storage tank and an electro-hydraulic servo valve; The electro-hydraulic servo valve is arranged between the energy storage tank and the brake pipeline of the vehicle; The energy storage oil tank comprises a high-pressure oil chamber and a low-pressure oil chamber, the oil inlet of the electro-hydraulic servo valve is communicated with the high-pressure oil chamber, and the oil outlet of the electro-hydraulic servo valve is communicated with the low-pressure oil chamber; the servo port of the electro-hydraulic servo valve is communicated with the brake pipeline; The pump shaft of the hydraulic pump is connected to the output shaft of the transmission of the vehicle; the oil inlet of the hydraulic pump is communicated with the low-pressure oil chamber; a linkage mechanism is provided between the servo port of the electro-hydraulic servo valve and the low-pressure oil chamber, and the hydraulic oil in the low-pressure oil chamber can be pushed to the oil inlet of the hydraulic pump by the linkage mechanism; the oil outlet of the hydraulic pump is communicated with the high-pressure oil chamber; The electro-hydraulic servo valve is communicatively connected to a controller of the vehicle, and the controller can control the action of the electro-hydraulic servo valve according to a brake signal; A telescopic diaphragm is arranged in the low-pressure oil chamber, and the telescopic diaphragm divides the low-pressure oil chamber into a third cavity and a fourth cavity; The linkage mechanism is located in the third cavity, and the linkage mechanism can push the telescopic diaphragm to change the liquid level of the hydraulic oil in the fourth cavity; The fourth cavity is communicated with the oil outlet of the electro-hydraulic servo valve and the oil inlet of the hydraulic pump.

2. The vehicle braking system according to claim 1, characterized in that: It also includes a pedal brake device located between the servo port of the electro-hydraulic servo valve and the brake pipeline; The pedal brake device comprises a brake pedal, a hydraulic booster and a brake master cylinder. The servo port of the electro-hydraulic servo valve is communicated with the hydraulic booster, and the brake master cylinder is communicated with the brake pipeline.

3. The vehicle braking system according to claim 2, characterized in that: The brake pedal is also provided with a pedal travel sensor, and the pedal travel sensor is communicatively connected with the controller.

4. The vehicle braking system according to claim 1, characterized in that: It also includes an anti-lock braking system and / or a vehicle body electronic stability system arranged on the brake pipeline.

5. The vehicle braking system according to claim 1, characterized in that: The hydraulic pump is a gear pump.

6. The vehicle braking system according to claim 1, characterized in that: An elastic member and a piston are arranged in the high-pressure oil chamber, and the piston separates the cavity of the high-pressure oil chamber into a first cavity and a second cavity; The elastic member is located in the first cavity, and the elastic member applies a force to the piston to move toward the second cavity, and the first cavity is provided with a vent hole; The second cavity is communicated with the oil inlet of the electro-hydraulic servo valve and the oil outlet of the hydraulic pump.

7. The vehicle braking system according to claim 6, characterized in that: A sealing member is provided between the side wall of the high-pressure oil chamber and the piston.

8. The vehicle braking system according to claim 1, characterized in that: A one-way valve is arranged between the oil outlet of the hydraulic pump and the high-pressure oil chamber to allow the hydraulic oil to flow to the high-pressure oil chamber in one direction.

9. A vehicle, characterized in that: A braking system for a vehicle comprising any one of claims 1 to 8.

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