Large-flow ESC system

Abstract

The invention relates to a large-flow ESC system capable of automatically exhausting, which comprises a main cylinder, an oil can, a plurality of brakes and a brake pipeline, the oil can is communicated with the main cylinder, the brake pipeline comprises a first pipeline, a second pipeline and a third pipeline, the first pipeline is communicated with the main cylinder and the plurality of brakes, and the second pipeline is communicated with the plurality of brakes. One end of the second pipeline is respectively communicated with the main cylinder and the oil can through a plurality of suction valves, a plurality of plunger pumps are arranged on the second pipeline, the other end of the second pipeline is communicated with the first pipeline, and the third pipeline is communicated with a plurality of brakes and the main cylinder; when the hydraulic system is applied to a large-tonnage vehicle model, the first pipeline and the third pipeline are closed, the second pipeline is opened, oil in the main cylinder and the oil pot flows into the plunger pumps through the suction valves, in the pressurizing process, the plunger pumps extract the oil from the main cylinder and can directly extract the oil from the oil pot, the flow of brake fluid in unit time can be increased, and the braking efficiency is improved. And rapid pressure increasing and reducing are achieved so as to meet the braking requirements of large-tonnage vehicle types.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle body control, and in particular to a large-flow ESC system capable of automatic exhaust. Background Art

[0002] ESC (Electronic Stability Controller) is the electronic stability control system of the vehicle body. It is widely used in the field of passenger cars and has mature technology. It can be divided into hydraulic ESC system and pneumatic ESC system.

[0003] The application scope of the existing hydraulic ESC system is affected by the vehicle load and can only cover ultra-light vehicles below 4.5 tons. For light and medium-sized vehicles of 4.5-11 tons, the existing hydraulic ESC system will face problems such as insufficient system pressure increase and decrease rate, insufficient booster failure backup capacity, and insufficient accumulator capacity. Although the existing pneumatic ESC system can be applied to large-tonnage vehicles, it has problems such as low control accuracy, high system complexity, and high noise.

[0004] Therefore, the existing ESC system has many shortcomings when applied to large-tonnage vehicles. Summary of the invention

[0005] In view of this, it is necessary to provide a large-flow ESC system that can automatically exhaust air to solve the problem that the existing ESC system has many shortcomings when applied to large-tonnage vehicles.

[0006] The present invention provides a large-flow ESC system capable of automatic exhaust, comprising a master cylinder, an oil pot, a plurality of brakes and a brake pipeline, wherein the oil pot is connected to the master cylinder, the brake pipeline comprises a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline is connected to the master cylinder and the plurality of brakes, one end of the second pipeline is respectively connected to the master cylinder and the oil pot via a plurality of suction valves, a plurality of plunger pumps are installed on the second pipeline, the other end of the second pipeline is connected to the first pipeline, and the third pipeline is connected to the plurality of brakes and the master cylinder.

[0007] Further, one end of the first pipeline is communicated with the master cylinder via a plurality of control valves, and the other end of the first pipeline is communicated with the plurality of brakes respectively via a plurality of booster valves.

[0008] Furthermore, the second pipeline is connected to a portion of the first pipeline between the control valve and the boost valve.

[0009] Furthermore, one end of the third pipeline is connected to the connections between multiple boosting valves and multiple brakes via multiple pressure reducing valves, an accumulator and a one-way valve are installed on the third pipeline, and the other end of the third pipeline is connected to the feed ends of the multiple plunger pumps.

[0010] Furthermore, it also includes a controller, which is electrically connected to the brake pipeline and is used to drive the brake pipeline to be in a braking state, a pressurizing state and a decompressing state.

[0011] Furthermore, when the controller drives the brake pipeline to be in a braking state, multiple control valves and multiple boost valves are opened, multiple suction valves and multiple pressure reducing valves are closed, multiple plunger pumps are closed, and the oil in the master cylinder flows to the multiple brakes via the first pipeline.

[0012] Furthermore, when the controller drives the brake line to be in a pressurized state, the multiple suction valves and the multiple pressure-boosting valves are all opened, the multiple control valves and the multiple pressure-reducing valves are all closed, the multiple plunger pumps are turned on, and the oil in the master cylinder and the oil tank flows to the multiple brakes via the second line and the multiple plunger pumps.

[0013] Furthermore, when the controller drives the brake line to be in a decompression state, the multiple pressure reducing valves and the multiple control valves are all opened, the multiple pressure boosting valves and the multiple suction valves are all closed, the multiple plunger pumps are turned on, and the oil in the multiple brakes flows back to the master cylinder via the third pipeline and the multiple plunger pumps.

[0014] Furthermore, the number of the brakes is four, the master cylinder is provided with two oil supply ports, the oil pot is provided with two oil supply ports, the number of the suction valves is four, two of which are connected to two of the oil supply ports of the master cylinder, and the other two of the suction valves are connected to the two oil supply ports of the oil pot.

[0015] Furthermore, the controller can drive the brake line to be in an exhaust state. At this time, the two suction valves connected to the oil tank and the multiple boosting valves are opened, the two suction valves connected to the master cylinder and the multiple pressure reducing valves are closed, the multiple control valves are opened and closed alternately, and the multiple plunger pumps are turned on.

[0016] Compared with the prior art, the ESC system is a hydraulic ESC system with high control accuracy, simple structure and low noise. At the same time, when applied to low loads, the oil can be transported to multiple brakes through the first pipeline. When the brakes are canceled, the oil in the brakes can be returned to the master cylinder through the third pipeline. When applied to large-tonnage vehicles, the first pipeline and the third pipeline are closed, and the second pipeline is opened. The oil in the master cylinder and the oil pot flows into multiple plunger pumps through multiple suction valves. Multiple plunger pumps increase the oil flow rate to introduce it into multiple brakes. During the above-mentioned pressurization process, the plunger pump not only draws oil from the master cylinder, but also directly draws oil from the oil pot, which can increase the flow rate of the brake fluid per unit time and achieve rapid pressure increase and decrease to meet the braking needs of large-tonnage vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a large flow ESC system capable of automatic exhaust provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a large-flow ESC system capable of automatic exhaust provided by an embodiment of the present invention in a normal braking state; Figure 3 A schematic structural diagram of a high-flow ESC system capable of automatic exhaust provided by an embodiment of the present invention in a pressurized state; Figure 4 A schematic diagram of a structure in a decompression state of a large flow ESC system capable of automatic exhaust provided by an embodiment of the present invention; Figure 5 A schematic structural diagram of a high-flow ESC system capable of automatic exhaust provided by an embodiment of the present invention in a pressure-maintaining state; Figure 6 A schematic diagram of the structure of a large-flow ESC system capable of automatic exhaust provided by an embodiment of the present invention in an exhaust state. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] like Figure 1 and Figure 3As shown, the present invention provides a large-flow ESC system capable of automatic exhaust, comprising a master cylinder 100, an oil pot 200, a plurality of brakes 300 and a brake pipeline 400, wherein the oil pot 200 is connected to the master cylinder 100, and the brake pipeline 400 comprises a first pipeline 410, a second pipeline 420 and a third pipeline 430, wherein the first pipeline 410 connects the master cylinder 100 and the plurality of brakes 300, one end of the second pipeline 420 is respectively connected to the master cylinder 100 and the oil pot 200 via a plurality of suction valves 421, a plurality of plunger pumps 422 are installed on the second pipeline 420, the other end of the second pipeline 420 is connected to the first pipeline 410, and the third pipeline 430 connects the plurality of brakes 300 and the master cylinder 100.

[0020] Among them, the ESC system is a hydraulic ESC system with high control accuracy, simple structure and low noise. At the same time, when applied to low load, the oil can be transported to multiple brakes 300 through the first pipeline 410. When the brake is canceled, the oil in the brake 300 can be returned to the master cylinder 100 through the third pipeline 430; when applied to large-tonnage vehicles, the first pipeline 410 and the third pipeline 430 are closed, and the second pipeline 420 is opened. The oil in the master cylinder 100 and the oil pot 200 flows into the multiple plunger pumps 422 through the multiple suction valves 421. The multiple plunger pumps 422 increase the flow rate of the oil to introduce it into the multiple brakes 300. In the above-mentioned pressurization process, the plunger pump 422 not only draws oil from the master cylinder 100, but also directly draws oil from the oil pot 200, which can increase the flow rate of the brake fluid per unit time and achieve rapid pressure increase and decrease to meet the braking needs of large-tonnage vehicles.

[0021] The master cylinder 100 in this embodiment is driven by the brake pedal 110. When the brake pedal 110 is pressed, the master cylinder 100 can deliver oil to the first pipeline 410 or the second pipeline 420. When the brake pedal 110 is released, the oil in the brake 300 returns to the master cylinder 100 from the third pipeline 430.

[0022] The master cylinder 100 in this embodiment includes a cylinder body, two pistons, a sliding rod and two springs, wherein one spring, one piston, another spring, another piston and the sliding rod are arranged in sequence in the cylinder body along the length direction of the cylinder body, and the sliding rod is connected to the brake pedal 110. When the brake pedal 110 is pressed, the spring contracts and the oil in the master cylinder 100 is squeezed out. When the brake pedal 110 is released, the spring rebounds.

[0023] The oil pot 200 in this embodiment is connected to the master cylinder 100 , and supplies brake fluid to the master cylinder 100 and / or the second pipeline 420 .

[0024] The plurality of brakes 300 in this embodiment are brake structures that can be installed on a vehicle body as would be conceivable by a person skilled in the art.

[0025] The brake circuit 400 in this embodiment includes a first circuit 410, a second circuit 420 and a third circuit 430, wherein the first circuit 410 connects the master cylinder 100 and multiple brakes 300, one end of the second circuit 420 is connected to the master cylinder 100 and the oil pot 200 respectively via multiple suction valves 421, multiple plunger pumps 422 are installed on the second circuit 420, the other end of the second circuit 420 is connected to the first circuit 410, and the third circuit 430 connects multiple brakes 300 and the master cylinder 100.

[0026] One end of the first pipeline 410 is connected to the master cylinder 100 via a plurality of control valves 411 , and the other end of the first pipeline 410 is connected to the plurality of brakes 300 via a plurality of pressure-boosting valves 412 .

[0027] The second pipeline 420 is connected to a portion of the first pipeline 410 between the control valve 411 and the boost valve 412 .

[0028] Among them, one end of the third pipeline 430 is connected to the connection points between multiple boosting valves 412 and multiple brakes 300 via multiple pressure reducing valves 431, an accumulator 432 and a one-way valve 433 are installed on the third pipeline 430, and the other end of the third pipeline 430 is connected to the feed end of multiple plunger pumps 422.

[0029] It is understandable that the pressure value in each pipeline can be known through the pressure sensor 120.

[0030] The present embodiment further includes a controller, which is electrically connected to the brake line 400 and is used to drive the brake line 400 to be in a braking state, a pressurizing state, and a depressurizing state.

[0031] like Figure 2 As shown, when the controller drives the brake line 400 to be in a braking state, the multiple control valves 411 and the multiple pressure-increasing valves 412 are all opened, the multiple suction valves 421 and the multiple pressure-reducing valves 431 are all closed, the multiple plunger pumps 422 are closed, and the oil in the master cylinder 100 flows to the multiple brakes 300 via the first line 410. At this time, the ESC system is in a normal braking mode.

[0032] like Figure 3As shown, the ESC system has an active boosting condition, for example, the wheel cylinder pressure of the corresponding wheel needs to be increased during yaw stability control, and the ESC system needs to build pressure to provide braking force when the brake booster fails. When the controller drives the brake line 400 to be in a boosting state, multiple suction valves 421 and multiple boosting valves 412 are all opened, multiple control valves 411 and multiple pressure reducing valves 431 are all closed, multiple plunger pumps 422 are opened, and the oil in the master cylinder 100 and the oil pot 200 flows to the multiple brakes 300 via the second pipeline 420 and multiple plunger pumps 422. It can be understood that the boosting of each wheel can be controlled to the target pressure by controlling the working state of the boosting valve 412, the pressure reducing valve 431 and the plunger pump 422.

[0033] like Figure 4 As shown, when the controller drives the brake line 400 to be in a decompression state, the multiple pressure reducing valves 431 and the multiple control valves 411 are all opened, the multiple pressure increasing valves 412 and the multiple suction valves 421 are all closed, the multiple plunger pumps 422 are opened, and the oil in the multiple brakes 300 flows back to the master cylinder 100 via the third pipeline 430 and the multiple plunger pumps 422. At this time, the ESC system is in a decompression mode.

[0034] like Figure 5 As shown, when the multiple pressure-increasing valves 412 and the pressure-reducing valves 431 are all closed, the multiple ESC systems are in a pressure-maintaining state.

[0035] In this embodiment, the number of the brakes 300 is four, the master cylinder 100 is provided with two oil supply ports, the oil pot 200 is provided with two oil supply ports, the number of the suction valves 421 is four, two of which are connected to two of the oil supply ports of the master cylinder 100, and the other two suction valves 421 are connected to two of the oil supply ports of the oil pot 200. Meanwhile, the number of the plunger pumps 422 is six.

[0036] The brake system needs to be vented after replacing parts. Traditional manual venting is time-consuming and laborious. The ESC system in this application can be used to automatically vent the entire brake system, which can reduce the workload of personnel. Automatic venting uses the suction valve 421 to directly suck the brake fluid from the oil pot 200, and uses the motor plunger pump 422 to continuously pressurize, squeezing the bubbles inside the brake system into the master cylinder 100 oil pot 200, thereby achieving the purpose of venting.

[0037] like Figure 6 As shown, the controller can drive the brake line 400 to be in an exhaust state. At this time, the two suction valves 421 connected to the oil tank 200 and the multiple boosting valves 412 are all opened, the two suction valves 421 connected to the master cylinder 100 and the multiple pressure reducing valves 431 are all closed, the multiple control valves 411 are alternately opened and closed, and the multiple plunger pumps 422 are turned on.

[0038] Specifically, the oil in the oil pot 200 is introduced into multiple brakes 300 via the plunger pump 422. At this time, the control valve 411 is in a closed state. As the plunger pump 422 works, the pressure in the brake 300 continues to increase, and the system pressure is increased to 10Mpa. After 5s, the plunger pump 422 stops working. After a period of time, the gas in the brake 300 is discharged, and the control valve 411 opens. The gas flows back to the oil pot 200 through the master cylinder 100. The above operation is repeated 10 times to end the exhaust work, all valves return to their initial positions, and the motor of the plunger pump 422 stops working.

[0039] Compared with the prior art: the ESC system is a hydraulic ESC system with high control accuracy, simple structure and low noise. At the same time, when applied to low load, the oil can be transported to multiple brakes 300 through the first pipeline 410. When the brake is canceled, the oil in the brake 300 can be returned to the master cylinder 100 through the third pipeline 430; when applied to large-tonnage vehicles, the first pipeline 410 and the third pipeline 430 are closed, and the second pipeline 420 is opened. The oil in the master cylinder 100 and the oil pot 200 flows into the multiple plunger pumps 422 through the multiple suction valves 421. The multiple plunger pumps 422 increase the flow rate of the oil to introduce it into the multiple brakes 300. In the above-mentioned pressurization process, the plunger pump 422 not only draws oil from the master cylinder 100, but also directly draws oil from the oil pot 200, which can increase the flow rate of the brake fluid per unit time and achieve rapid pressure increase and decrease to meet the braking needs of large-tonnage vehicles.

[0040] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A high-flow ESC system capable of automatic exhaust, characterized in that: include: Master cylinder; an oil pot, which is connected to the master cylinder; Multiple brakes; a brake pipeline, comprising a first pipeline, a second pipeline and a third pipeline; Wherein, the first pipeline is connected with the master cylinder and the plurality of brakes; One end of the second pipeline is connected to the master cylinder and the oil pot via a plurality of suction valves, a plurality of plunger pumps are installed on the second pipeline, and the other end of the second pipeline is connected to the first pipeline; The third pipe communicates with the plurality of brakes and the master cylinder.

2. The large flow ESC system capable of automatic exhaust according to claim 1, characterized in that: One end of the first pipeline is communicated with the master cylinder via a plurality of control valves, and the other end of the first pipeline is communicated with the plurality of brakes respectively via a plurality of pressure-increasing valves.

3. The large flow ESC system capable of automatic exhaust according to claim 2, characterized in that: The second pipeline is communicated with a portion of the first pipeline located between the control valve and the boost valve.

4. The large flow ESC system capable of automatic exhaust according to claim 3, characterized in that: One end of the third pipeline is connected to the connection between multiple boosting valves and multiple brakes via multiple pressure reducing valves, an accumulator and a one-way valve are installed on the third pipeline, and the other end of the third pipeline is connected to the feed end of the multiple plunger pumps.

5. The large flow ESC system capable of automatic exhaust according to claim 4, characterized in that: The device also includes a controller which is electrically connected to the brake pipeline and is used to drive the brake pipeline to be in a braking state, a pressurizing state and a depressurizing state.

6. The large flow ESC system capable of automatic exhaust according to claim 5, characterized in that: When the controller drives the brake pipeline to be in a braking state, multiple control valves and multiple boosting valves are opened, multiple suction valves and multiple pressure reducing valves are closed, multiple plunger pumps are closed, and the oil in the master cylinder flows to the multiple brakes through the first pipeline.

7. The large flow ESC system capable of automatic exhaust according to claim 5, characterized in that: When the controller drives the brake line to be in a pressurized state, the multiple suction valves and the multiple pressure-boosting valves are all opened, the multiple control valves and the multiple pressure-reducing valves are all closed, the multiple plunger pumps are turned on, and the oil in the master cylinder and the oil tank flows to the multiple brakes via the second pipeline and the multiple plunger pumps.

8. The large flow ESC system capable of automatic exhaust according to claim 5, characterized in that: When the controller drives the brake line to be in a decompression state, the multiple pressure reducing valves and the multiple control valves are opened, the multiple pressure boosting valves and the multiple suction valves are closed, the multiple plunger pumps are turned on, and the oil in the multiple brakes flows back to the master cylinder via the third pipeline and the multiple plunger pumps.

9. The large flow ESC system capable of automatic exhaust according to claim 5, characterized in that: The number of the brakes is four, the master cylinder is provided with two oil supply ports, the oil pot is provided with two oil supply ports, the number of the suction valves is four, two of which are connected to two of the oil supply ports of the master cylinder, and the other two of the suction valves are connected to the two oil supply ports of the oil pot.

10. The large flow ESC system capable of automatic exhaust according to claim 9, characterized in that: The controller can drive the brake line to be in an exhaust state. At this time, the two suction valves connected to the oil tank and the multiple boosting valves are all opened, the two suction valves connected to the master cylinder and the multiple pressure reducing valves are all closed, the multiple control valves are alternately opened and closed, and the multiple plunger pumps are turned on.

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