Multifunctional integrated hydraulic brake system loop

Abstract

The invention discloses a multifunctional integrated hydraulic brake system loop which comprises a hydraulic supply pipeline, a brake branch, a left output pipeline, a right output pipeline, a left load, a right load, an oil return pipeline and a controller. One path is connected with a left load through a left output pipeline, the other path is connected with a right load through a right output pipeline, the brake branch is divided into two paths, namely a first branch and a second branch, the first branch is used for realizing proportional pressure output, and the second branch is used for realizing switching between a zero-leakage pressure maintaining function and a pressure unloading function; a left shuttle valve and a left pressure sensor are arranged on the left output pipeline, and a right shuttle valve and a right pressure sensor are arranged on the right output pipeline. The hydraulic system can linearly output oil pressure proportionally and automatically and manually control reversing of an oil way, is small in leakage of a hydraulic loop, is suitable for occasions with high pressure maintaining requirements, and is small in output hysteresis of the output oil pressure and good in repeatability parameter and linearity index.

Description

Technical Field

[0001] The invention relates to the field of hydraulic brake system circuits, and in particular to a multifunctional integrated hydraulic brake system circuit. Background Art

[0002] At present, hydraulic brake system circuits are widely used in hydraulic systems in common braking situations such as road vehicles, construction machinery, and industrial machinery, and the braking needs of vehicles or construction machinery are achieved through hydraulic control force.

[0003] In order to reduce manufacturing costs, solenoid valves are often used for simple on / off control to achieve the braking function of the hydraulic circuit. The solenoid valves use pulse width modulation (PWM) to control the solenoid valves for simple on / off control. When this method is used, the braking pressure cannot be continuously controlled, and the braking pressure does not have a more ideal pressure gradient. Therefore, it is necessary to develop a pressure regulating control valve with better performance to achieve a more ideal pressure gradient, thereby improving the comfort of the braking process. In addition, for braking occasions with large loads and the need to maintain the oil pressure for a long time, it is necessary to configure a zero-leakage solenoid reversing valve with a long-term pressure maintenance function, and switch the oil circuit according to the actual braking conditions. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a multifunctional integrated hydraulic brake system circuit, which outputs oil pressure proportionally and linearly through left and right proportional pressure solenoid valves, thereby solving the problem that the load output does not have an ideal pressure gradient; for braking occasions with large loads and the need to maintain the oil pressure for a long time, a zero-leakage solenoid reversing valve with a position feedback function is configured to achieve long-term pressure maintenance function and oil circuit reversing function.

[0005] The specific technical solutions of the present invention are as follows:

[0006] A multifunctional integrated hydraulic brake system circuit, the circuit includes a hydraulic supply pipeline, a brake branch, a left output pipeline, a right output pipeline, a left load, a right load, an oil return pipeline, and a controller. The hydraulic supply pipeline passes through the brake branch, one of which is connected to the left load through the left output pipeline, and the other is connected to the right load through the right output pipeline, wherein:

[0007] The hydraulic supply pipeline is provided with a pressure sensor;

[0008] The braking branch includes a first branch and a second branch, wherein the first branch is used to realize proportional pressure output; the second branch is used to realize switching between a zero leakage pressure maintaining function and a pressure unloading function;

[0009] The pressure sensor, the left pressure sensor and the right pressure sensor are all connected to the controller for transmitting signals.

[0010] Preferably, the first branch includes a zero-leakage electromagnetic switch valve, a zero-leakage electromagnetic switch output pipeline, a left proportional pressure solenoid valve, and a right proportional pressure solenoid valve. One path of the zero-leakage electromagnetic switch output pipeline is connected to the left output pipeline through the left proportional pressure solenoid valve, and the other path is connected to the right output pipeline through the right proportional pressure solenoid valve.

[0011] Preferably, the second branch includes a zero-leakage pressure reducing valve, a zero-leakage electromagnetic reversing valve with a position feedback function, and an output pipeline of the electromagnetic reversing valve.

[0012] Preferably, the zero-leakage solenoid switch valve is connected to the controller, used to control the on and off of the first branch, and is in a normally closed state, with zero leakage in the normally closed state; the zero-leakage solenoid switch valve opens when receiving an instruction from the controller, allowing the liquid in the hydraulic supply pipeline to pass through the zero-leakage solenoid switch output pipeline.

[0013] Preferably, the left proportional pressure solenoid valve is connected to the controller, and a proportional pressure output is achieved through the signal of the controller, which is used to adjust the left load pressure; the right proportional pressure solenoid valve is connected to the controller, and a proportional pressure output is achieved through the signal of the controller, which is used to adjust the right load pressure.

[0014] Preferably, the left proportional pressure solenoid valve and the right proportional pressure solenoid valve are provided with an oil return channel connected to the oil return pipeline. When the left proportional pressure solenoid valve and the right proportional pressure solenoid valve are powered off, the hydraulic liquid flows to the oil tank through the oil return pipeline, thereby realizing the pressure unloading function of the hydraulic circuit.

[0015] Preferably, the zero-leakage electromagnetic reversing valve with position feedback function is connected to the controller, used to control the on-off of the second branch, and is in a normally closed state, and has zero leakage in the normally closed state;

[0016] The zero-leakage electromagnetic reversing valve with position feedback function is energized upon receiving a command from the controller, so that the liquid in the hydraulic supply pipeline passes through the electromagnetic reversing valve output pipeline, thereby realizing a zero-leakage pressure-maintaining function;

[0017] The zero-leakage solenoid reversing valve with position feedback function is provided with an oil return channel connected to the oil return pipeline. When the zero-leakage solenoid reversing valve with position feedback function is powered off, the hydraulic fluid flows to the oil tank through the oil return pipeline, thereby realizing the pressure unloading function of the hydraulic circuit.

[0018] Preferably, the zero-leakage electromagnetic reversing valve with position feedback function can transmit the valve core position information to the controller to realize real-time monitoring of the valve core position; it can also be manually controlled to realize manual control of oil circuit reversing in emergency state.

[0019] Preferably, the zero-leakage pressure reducing valve is used to reduce the pressure of the hydraulic supply pipeline to a pressure within a specified range.

[0020] Preferably, the left shuttle valve and the right shuttle valve are one-way conducting and have a zero leakage function, which can improve the working efficiency of the hydraulic circuit.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention can output oil pressure in a proportional linear manner through the left and right proportional pressure solenoid valves, and simultaneously realize the control of the left and right load pressures respectively;

[0023] (2) The present invention uses a zero-leakage electromagnetic reversing valve with a position feedback function to realize automatic control of the oil circuit reversal. In an emergency, manual control can also be used to realize hydraulic circuit oil circuit reversal;

[0024] (3) The present invention uses a zero-leakage solenoid valve switch valve, a zero-leakage pressure reducing valve, and a zero-leakage solenoid reversing valve with a position feedback function, so that the hydraulic circuit has low leakage and is particularly suitable for occasions where the hydraulic system has high pressure maintenance requirements;

[0025] (4) The present invention realizes closed-loop control through the hydraulic supply pipeline pressure sensor, the left pressure sensor, and the right pressure sensor, and the output oil pressure has a small output hysteresis loop, and good repeatability parameters and linearity indicators;

[0026] (5) The present invention uses a zero-leakage electromagnetic reversing valve with a position feedback function to monitor the valve core position signal in real time and has the function of judging the working state of the zero-leakage electromagnetic reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions disclosed in the present invention, the following briefly introduces the drawings required to be used in some embodiments disclosed in the present invention. Obviously, the drawings described below are only drawings of some embodiments disclosed in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the products involved in the embodiments disclosed in the present invention, the actual process of the method, etc.

[0028] Figure 1 A schematic diagram of a multifunctional integrated hydraulic brake system circuit provided by the present invention.

[0029] The accompanying drawings are marked as follows: 1. hydraulic supply pipeline; 2. pressure sensor; 3. zero-leakage solenoid switch valve; 4. zero-leakage solenoid switch output pipeline; 5. controller; 6. zero-leakage pressure reducing valve; 7. zero-leakage solenoid reversing valve with position feedback function; 8. solenoid reversing valve output pipeline; 9. oil return pipeline; 10. left proportional pressure solenoid valve; 11. right proportional pressure solenoid valve; 12. left shuttle valve; 13. right shuttle valve; 14. left pressure sensor; 15. left output pipeline; 16. right output pipeline; 17. right pressure sensor; 18. left load; 19. right load. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figure 1 As shown, a multifunctional integrated hydraulic brake system circuit provided in the present invention comprises a hydraulic supply pipeline 1, a brake branch, a left output pipeline 15, a right output pipeline 16, a left load 18, a right load 19, an oil return pipeline 9, and a controller 5. The hydraulic supply pipeline 1 is connected to the left load 18 through the brake branch through the left output pipeline 15, and is connected to the right load 19 through the right output pipeline 16, wherein:

[0032] The hydraulic supply pipeline 1 is provided with a pressure sensor 2;

[0033] The braking branch is divided into two branches, a first branch and a second branch, wherein the first branch is used to realize proportional pressure output; the second branch is used to realize the switching between the zero leakage pressure maintaining function and the pressure unloading function;

[0034] The left output pipeline 15 is provided with a left shuttle valve 12 and a left pressure sensor 14, and the right output pipeline 16 is provided with a right shuttle valve 13 and a right pressure sensor 17;

[0035] The pressure sensor 2 , the left pressure sensor 14 , and the right pressure sensor 17 are all connected to the controller 5 for transmitting signals.

[0036] The first branch includes a zero-leakage electromagnetic switch valve 3, a zero-leakage electromagnetic switch output pipeline 4, a left proportional pressure solenoid valve 10, and a right proportional pressure solenoid valve 11. The zero-leakage electromagnetic switch output pipeline 4 is connected to the left output pipeline 15 through the left proportional pressure solenoid valve 10, and is connected to the right output pipeline 16 through the right proportional pressure solenoid valve 11.

[0037] The second branch includes a zero-leakage pressure reducing valve 6 , a zero-leakage electromagnetic reversing valve 7 with a position feedback function, and an electromagnetic reversing valve output pipeline 8 .

[0038] The zero-leakage electromagnetic switch valve 3 is connected to the controller 5, and is used to control the on-off of the first branch. It is in a normally closed state, and there is zero leakage in the normally closed state; it opens when receiving the instruction of the controller 5, so that the liquid in the hydraulic supply pipeline 1 passes through the zero-leakage electromagnetic switch output pipeline 4.

[0039] The left proportional pressure solenoid valve 10 is connected to the controller 5, and realizes proportional pressure output through the signal of the controller 5, which is used to adjust the pressure of the left load 18; the right proportional pressure solenoid valve 11 is connected to the controller 5, and realizes proportional pressure output through the signal of the controller 5, which is used to adjust the pressure of the right load 19.

[0040] The left proportional pressure solenoid valve 10 and the right proportional pressure solenoid valve 11 are provided with an oil return channel, which is connected to the oil return pipeline 9. When the left proportional pressure solenoid valve 10 and the right proportional pressure solenoid valve 11 are powered off, the hydraulic liquid flows to the oil tank through the oil return pipeline 9, realizing the pressure unloading function of the hydraulic circuit.

[0041] The zero-leakage electromagnetic reversing valve 7 with position feedback function is connected to the controller 5, and is used to control the on and off of the second branch. It is in a normally closed state, and there is zero leakage in the normally closed state. When receiving the command of the controller 5, it is energized to make the liquid in the hydraulic supply pipeline 1 pass through the electromagnetic reversing valve output pipeline 8, so as to achieve a zero-leakage pressure-maintaining function.

[0042] The zero-leakage electromagnetic reversing valve 7 with position feedback function is provided with an oil return channel, which is connected to the oil return pipeline 9. When the zero-leakage electromagnetic reversing valve 7 with position feedback function is powered off, the hydraulic liquid flows to the oil tank through the oil return pipeline 9, realizing the pressure unloading function of the hydraulic circuit.

[0043] The zero-leakage electromagnetic reversing valve 7 with position feedback function can transmit the valve core position information to the controller 5 to realize real-time monitoring of the valve core position; it can also be manually controlled to realize manual control of oil circuit reversal in emergency state.

[0044] The zero-leakage pressure reducing valve 6 is used to reduce the pressure of the hydraulic supply pipeline 1 to a pressure within a specified range.

[0045] The left shuttle valve 12 and the right shuttle valve 13 are one-way conducting and have a zero leakage function, which can improve the working efficiency of the hydraulic circuit.

[0046] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention using the above disclosed contents without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the contents of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A multifunctional integrated hydraulic brake system circuit, characterized in that: The circuit comprises a hydraulic supply pipeline (1), a brake branch, a left output pipeline (15), a right output pipeline (16), a left load (18), a right load (19), an oil return pipeline (9), and a controller (5). The hydraulic supply pipeline (1) is connected to the left load (18) through the brake branch, one way through the left output pipeline (15), and the other way through the right output pipeline (16), wherein: The hydraulic supply pipeline (1) is provided with a pressure sensor (2); The braking branch includes a first branch and a second branch, wherein the first branch is used to realize proportional pressure output; the second branch is used to realize switching between a zero leakage pressure maintaining function and a pressure unloading function; The left output pipeline (15) is provided with a left shuttle valve (12) and a left pressure sensor (14), and the right output pipeline (16) is provided with a right shuttle valve (13) and a right pressure sensor (17); The pressure sensor (2), the left pressure sensor (14), and the right pressure sensor (17) are all connected to the controller (5) for transmitting signals.

2. A multifunctional integrated hydraulic brake system circuit according to claim 1, characterized in that: The first branch comprises a zero-leakage electromagnetic switch valve (3), a zero-leakage electromagnetic switch output pipeline (4), a left proportional pressure electromagnetic valve (10), and a right proportional pressure electromagnetic valve (11); one path of the zero-leakage electromagnetic switch output pipeline (4) is connected to a left output pipeline (15) via the left proportional pressure electromagnetic valve (10), and the other path is connected to a right output pipeline (16) via the right proportional pressure electromagnetic valve (11).

3. A multifunctional integrated hydraulic brake system circuit according to claim 1, characterized in that: The second branch comprises a zero-leakage pressure reducing valve (6), a zero-leakage electromagnetic reversing valve (7) with a position feedback function, and an electromagnetic reversing valve output pipeline (8).

4. A multifunctional integrated hydraulic brake system circuit according to claim 2, characterized in that: The zero-leakage electromagnetic switch valve (3) is connected to the controller (5) and is used to control the on-off of the first branch, and is in a normally closed state, in which there is zero leakage; The zero-leakage electromagnetic switch valve (3) opens upon receiving an instruction from the controller (5), allowing the liquid in the hydraulic supply pipeline (1) to pass through the zero-leakage electromagnetic switch output pipeline (4).

5. The multifunctional integrated hydraulic brake system circuit according to claim 2, characterized in that: The left proportional pressure solenoid valve (10) is connected to the controller (5), and realizes proportional pressure output through the signal of the controller (5), which is used to adjust the pressure of the left load (18); the right proportional pressure solenoid valve (11) is connected to the controller (5), and realizes proportional pressure output through the signal of the controller (5), which is used to adjust the pressure of the right load (19).

6. A multifunctional integrated hydraulic brake system circuit according to claim 2, characterized in that: The left proportional pressure solenoid valve (10) and the right proportional pressure solenoid valve (11) are provided with an oil return channel connected to the oil return pipeline (9). When the left proportional pressure solenoid valve (10) and the right proportional pressure solenoid valve (11) are powered off, the hydraulic fluid flows to the oil tank through the oil return pipeline (9), thereby realizing the pressure unloading function of the hydraulic circuit.

7. The multifunctional integrated hydraulic brake system circuit according to claim 3, characterized in that: The zero-leakage electromagnetic reversing valve (7) with position feedback function is connected to the controller (5) and is used to control the on and off of the second branch. It is in a normally closed state, and has zero leakage. When receiving an instruction from the controller (5), it is energized to allow the liquid in the hydraulic supply pipeline (1) to pass through the electromagnetic reversing valve output pipeline (8), thereby achieving a zero-leakage pressure-maintaining function. The zero-leakage electromagnetic reversing valve (7) with position feedback function is provided with an oil return channel connected to the oil return pipeline (9); when the zero-leakage electromagnetic reversing valve (7) with position feedback function is powered off, hydraulic fluid flows to the oil tank through the oil return pipeline (9), thereby realizing the pressure unloading function of the hydraulic circuit.

8. The multifunctional integrated hydraulic brake system circuit according to claim 3, characterized in that: The zero-leakage electromagnetic reversing valve (7) with position feedback function can transmit valve core position information to the controller (5) to achieve real-time monitoring of the valve core position; it can also be manually controlled to achieve manual control of oil circuit reversal in an emergency state.

9. The multifunctional integrated hydraulic brake system circuit according to claim 3, characterized in that: The zero-leakage pressure reducing valve (6) is used to reduce the pressure of the hydraulic supply pipeline (1) to a pressure within a specified range.

10. The multifunctional integrated hydraulic brake system circuit according to claim 1, characterized in that: The left shuttle valve (12) and the right shuttle valve (13) are one-way conducting and have a zero leakage function, thereby improving the working efficiency of the hydraulic circuit.

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