Multi-electric and digital valve integrated brake system

Abstract

The invention relates to the technical field of brake systems, and particularly discloses a multi-electric and digital valve integrated brake system which comprises an oil supply pipeline, an oil return pipeline, a controller, a switching valve, a shutdown brake control pipeline, an active brake control pipeline and at least one brake device. The switching valve comprises three ports, the output end of the oil supply pipeline is connected with the input end of the active brake control pipeline and the first port, the second port is connected with the input end of the oil return pipeline, the third port is connected with the shutdown brake control pipeline, and the output end of the active brake control pipeline is communicated with the input end of the oil return pipeline. And at least one brake device is connected with the active brake control pipeline and / or the stop brake control pipeline. The controller controls the oil supply pipeline, the shutdown brake control pipeline, the active brake control pipeline and the switching valve, so that two working modes of shutdown brake and active brake are realized, the whole pipeline is simplified, and the cost is reduced on the basis of ensuring functions.

Description

Technical Field

[0001] The present invention relates to the technical field of brake systems, and in particular to a multi-electric and digital valve integrated brake system. Background Art

[0002] The aircraft braking system has two working modes: parking brake and active brake. Both working modes rely on multi-electric and digital valve integrated brake systems to slow down or stop the aircraft. They are important components of the aircraft braking system and play a key role in ensuring the safe parking and deceleration of the aircraft. Among them, the parking brake is used to prevent the aircraft from moving by locking the brake system when the aircraft is parked on the apron for a long time, and the active brake is a brake system used to slow down and stop the aircraft during takeoff and landing.

[0003] Existing aircraft braking system solutions do not combine the two working modes of parking brake and active brake into one solution, and most of them use rotary direct-drive servo valves as brake elements, which have complex structures, high costs, large leakage, and large requirements for the volume of accumulators.

[0004] Based on the above problems, how to make the structure of the aircraft braking system simpler and reduce costs is an issue that needs to be solved urgently. Summary of the invention

[0005] In view of the technical problems in the prior art, the present invention provides a multi-electric and digital valve integrated brake system.

[0006] A multi-electric and digital valve integrated brake system of the present invention comprises an oil supply pipeline, an oil return pipeline, a controller, a switching valve, a parking brake control pipeline, an active brake control pipeline and at least one brake device; the controller is communicatively connected with the oil supply pipeline, the switching valve, the parking brake control pipeline and the active brake control pipeline; the switching valve is provided with a first port, a second port and a third port, wherein:

[0007] The controller is used to control the oil supply pipeline to output hydraulic oil;

[0008] The output end of the oil supply pipeline is connected to the input end of the active brake control pipeline; the output end of the oil supply pipeline is also connected to the first port; the second port is connected to the input end of the oil return pipeline, and the third port is connected to the parking brake control pipeline; the output end of the active brake control pipeline is connected to the input end of the oil return pipeline;

[0009] The controller is also used to control the port connection state of the switching valve. When the first port is connected to the third port, the third port is the input end of the parking brake control pipeline; when the second port is connected to the third port, the third port is the output end of the parking brake control pipeline.

[0010] At least one of the brake devices is connected to the active brake control pipeline and / or the parking brake control pipeline; the controller is also used to control the active brake control pipeline and the parking brake control pipeline to deliver hydraulic oil to the brake device, and control the active brake control pipeline and the parking brake control pipeline to output hydraulic oil to the return oil pipeline.

[0011] Furthermore, when the brake system includes a plurality of the brake devices, the parking brake control pipeline and the active brake control pipeline are each provided with a corresponding number of a plurality of control branch pipelines, and the plurality of control branch pipelines are respectively connected to the plurality of the brake devices;

[0012] The controller controls the plurality of control branch pipelines to deliver hydraulic oil to the brake device and to output hydraulic oil to the oil return pipeline.

[0013] Furthermore, when the brake system includes a plurality of the brake devices, the brake system also includes a plurality of the oil supply pipelines, the oil return pipelines and a plurality of switching valves;

[0014] The plurality of control branch pipelines of the parking brake control pipeline are connected with the output ends of one or more oil supply pipelines and the input ends of one or more oil return pipelines through one or more switching valves;

[0015] The input ends of the several control branch pipelines of the active brake control pipeline are communicated with the output ends of one or more of the oil supply pipelines, and the output ends of the several control branch pipelines are communicated with the input ends of one or more of the oil return pipelines.

[0016] Furthermore, the oil supply pipeline includes a hydraulic oil tank, a hydraulic pump, a one-way valve and an accumulator arranged along the flow direction of the oil body; the controller is in communication connection with the hydraulic pump;

[0017] The controller controls the hydraulic pump to pump out the hydraulic oil in the hydraulic oil tank, and the hydraulic oil is stored in the accumulator and / or delivered to the output end of the oil supply pipeline.

[0018] Furthermore, the oil supply pipeline also includes a filter and a first pressure sensor, and the filter is arranged on the pipeline between the hydraulic pump and the one-way valve; the first pressure sensor is communicatively connected to the controller, and the first pressure sensor is used to measure the oil pressure value at the output end of the oil supply pipeline.

[0019] Furthermore, it also includes a first overflow pipe of the first overflow valve and a second overflow pipe including the second overflow valve; the first overflow pipe connects the oil supply pipeline and the oil return pipeline, and the flow direction is from the output end of the filter to the input end of the oil return pipeline; the second overflow pipe is located outside the switching valve, connects the second port and the third port, and the flow direction is from the third port to the second port.

[0020] Furthermore, the oil return pipeline includes a one-way valve and a hydraulic oil tank arranged along the flow direction of the oil body, and the hydraulic oil flows through the one-way valve and is stored in the hydraulic oil tank.

[0021] Furthermore, the parking brake control pipeline is an oil pipeline provided with a normally open electric control valve, and the controller is communicatively connected with the normally open electric control valve.

[0022] Furthermore, the active brake control pipeline is an oil supply pipeline provided with a first normally closed electrically controlled valve and a second normally closed electrically controlled valve; the first end of the first normally closed electrically controlled valve is connected to the output end of the oil supply pipeline, and the first end of the second normally closed electrically controlled valve is connected to the input end of the oil return pipeline; the second end of the first normally closed electrically controlled valve and the second end of the second normally closed electrically controlled valve are connected, and both are connected to the brake device.

[0023] Furthermore, the brake device is provided with a second pressure sensor; the second pressure sensor is communicatively connected with the controller and is used to measure the oil pressure value of the brake device.

[0024] The multi-electric and digital valve integrated brake system of the present invention comprises an oil supply pipeline, an oil return pipeline, a controller, a switching valve, a parking brake control pipeline, an active brake control pipeline and at least one brake device; the controller is communicatively connected with the oil supply pipeline, the switching valve, the parking brake control pipeline and the active brake control pipeline. The present invention achieves the following beneficial effects:

[0025] (1) By connecting the output end of the oil supply pipeline with the input end of the active brake control pipeline, connecting the output end of the active brake control pipeline with the input end of the oil return pipeline, and connecting at least one brake device with the active brake control pipeline, when active braking is performed, the controller controls the oil supply pipeline to output hydraulic oil, and also controls the active brake control pipeline to deliver hydraulic oil to the brake device, thereby realizing active braking of the brake device during the aircraft takeoff, landing, etc., and when the active braking is canceled, the controller controls the active brake control pipeline to output hydraulic oil to the oil return pipeline to realize the oil unloading process.

[0026] (2) The switching valve is provided with a first port, a second port and a third port. The output end of the oil supply pipeline is connected to the first port of the switching valve, the second port of the switching valve is connected to the input end of the oil return pipeline, and the third port of the switching valve is connected to the parking brake control pipeline, and the parking brake control pipeline is connected to the brake device; the controller controls the port connection state of the switching valve. When the parking brake is applied, the controller controls the first port and the third port to be connected, and the third port serves as the input end of the parking brake control pipeline. The controller controls the oil supply pipeline to output hydraulic oil to the parking brake control pipeline. The controller controls the parking brake control pipeline to deliver hydraulic oil to the brake device, so as to achieve the locking brake of the aircraft when parking; when the parking brake is cancelled, the controller controls the second port and the third port to be connected, and the third port serves as the output end of the parking brake control pipeline. The controller then controls the parking brake control pipeline to output hydraulic oil to the oil return pipeline, so as to achieve the oil unloading process.

[0027] (3) The multi-electric and digital valve integrated brake system of the present invention combines the two working modes of parking brake and active brake into one solution. The two share the oil supply pipeline and the oil return pipeline. The controller realizes the two working modes of parking brake and active brake by controlling the oil supply pipeline, parking brake control pipeline, active brake control pipeline and the switching valve. Compared with the prior art, the pipeline combined with the switching valve in the present invention makes the overall pipeline more streamlined, which further reduces the cost while ensuring the function. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 1 A module composition diagram of a multi-electric and digital valve integrated brake system according to an embodiment of the present invention;

[0030] Figure 2 A structural diagram of a multi-electric and digital valve integrated brake system according to an embodiment of the present invention;

[0031] Among them, 10-oil supply pipeline, 101-hydraulic oil tank, 102-hydraulic pump, 103-check valve, 104-accumulator, 105-filter, 106-first pressure sensor, 20-return oil pipeline, 30-controller, 40-switching valve, 50-parking brake control pipeline, 501-normally open electric control valve, 60-active brake control pipeline, 601-first normally closed electric control valve, 602-second normally closed electric control valve, 70-brake device, 701-second pressure sensor, 80-first overflow valve, 90-second overflow valve. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions 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 belong to the protection scope of the present invention.

[0033] A multi-electric and digital valve integrated brake system according to an embodiment of the present invention, such as Figure 1 As shown, the brake system includes an oil supply pipeline 10, an oil return pipeline 20, a controller 30, a switching valve 40, a parking brake control pipeline 50, an active brake control pipeline 60 and at least one brake device 70; the controller 30 is connected to the oil supply pipeline 10, the switching valve 40, the parking brake control pipeline 50, and the active brake control pipeline 60 for communication. Figure 1The connection between the middle dotted line and the controller 30 refers to a communication connection, including the controller 30's collection of information and the issuance of relevant control instructions. The switching valve 40 in this embodiment is provided with a first port 401, a second port 402 and a third port 403, wherein: the controller 30 is used to control the oil supply line 10 to output hydraulic oil; the output end of the oil supply line 10 is connected to the input end of the active brake control line 60; the output end of the oil supply line 10 is also connected to the first port 401; the second port 402 is connected to the input end of the return oil line 20, and the third port 403 is connected to the parking brake control line 50; the output end of the active brake control line 60 is connected to the input end of the return oil line 20; the controller 30 is also used to control the port connection state of the switching valve 40, When the first port 401 and the third port 403 are connected, the third port 403 is the input end of the parking brake control pipeline 50; when the second port 402 and the third port 403 are connected, the third port 403 is the output end of the parking brake control pipeline 50; at least one brake device 70 is connected to the active brake control pipeline 60 and / or the parking brake control pipeline 50; the controller 30 is also used to control the active brake control pipeline 60 and the parking brake control pipeline 50 to transport hydraulic oil to the brake device 70, and control the active brake control pipeline 60 and the parking brake control pipeline 50 to output hydraulic oil to the return oil pipeline 20.

[0034] In the embodiment of the present invention, the controller 30 controls the oil supply pipeline 10 to output hydraulic oil, and finally increases the oil pressure at the brake device 70 to achieve the purpose of braking the wheel. The output amount of hydraulic oil and the oil pressure of the output hydraulic oil of the oil supply pipeline 10 need to be considered in combination with the distance and diameter of the entire pipeline to the brake device 70, and are also closely related to the number of brake devices 70. In this embodiment, the output end of the oil supply pipeline 10 is connected to the input end of the active brake control pipeline 60, the output end of the active brake control pipeline 60 is connected to the input end of the return oil pipeline 20, and at least one brake device 70 is connected to the active brake control pipeline 60. When active braking is performed, the controller 30 controls the oil supply pipeline 10 to output hydraulic oil, and also controls the active brake control pipeline 60 to deliver hydraulic oil to the brake device 70, so as to achieve active braking of the brake device 70 during takeoff and landing of the aircraft. When the active braking is canceled, the controller 30 controls the active brake control pipeline 60 to output hydraulic oil to the return oil pipeline 20 to achieve the oil unloading process. In addition, the output end of the oil supply pipeline 10 is connected to the first port 401 of the switching valve 40, the second port 402 is connected to the input end of the oil return pipeline 20, and the third port 403 is connected to the parking brake control pipeline 50, and the parking brake control pipeline 50 is connected to the brake device 70; the controller 30 controls the port connection state of the switching valve 40. When the parking brake is performed, the controller 30 controls the first port 401 and the third port 403 to be connected, and the third port 403 serves as the input end of the parking brake control pipeline 50. The controller 30 controls the oil supply pipeline 10 to output hydraulic oil to the parking brake control pipeline 50. The controller 30 controls the parking brake control pipeline 50 to deliver hydraulic oil to the brake device 70 to achieve the locking brake of the aircraft when parking; when the parking brake is canceled, the controller 30 controls the second port 402 and the third port 403 to be connected. The third port 403 is the output end of the parking brake control pipeline 50. The controller 30 then controls the parking brake control pipeline 50 to output hydraulic oil to the oil return pipeline 20 to achieve the oil unloading process.

[0035] The multi-electric and digital valve integrated brake system of the embodiment of the present invention combines the two working modes of parking brake and active brake into one solution. The two share the oil supply pipeline 10 and the oil return pipeline 20. The controller 30 realizes the two working modes of parking brake and active brake by controlling the oil supply pipeline 10, the parking brake control pipeline 50, the active brake control pipeline 60 and the switching valve 40. Compared with the prior art, the pipeline combined with the switching valve in the present invention makes the overall pipeline more streamlined, which further reduces the cost while ensuring the functionality.

[0036] In another embodiment of the present invention, the brake system includes a plurality of brake devices 70. In this case, the parking brake control pipeline 50 and the active brake control pipeline 60 are both provided with a corresponding number of multiple control branch pipelines, and the multiple control branch pipelines are respectively connected to the multiple brake devices 70; the controller 30 controls the multiple control branch pipelines to deliver hydraulic oil to the brake device 70 and output hydraulic oil to the return oil pipeline 20. In this embodiment, the brake system includes N brake devices 70 as an example, wherein N1 brake devices are designed to work in the parking brake working mode, and N2 brake devices are designed to work in the active brake working mode. The values ​​of N1 and N2 are both less than or equal to N. In other words, all brake devices 70 can work in the parking brake working mode and the active brake working mode, or some brake devices 70 can only work in the parking brake working mode or the active brake working mode. The specific values ​​of N, N1, and N2 are determined according to the arrangement, quantity, and braking requirements of the brake devices 70 in the brake system, and are not specifically limited in this embodiment.

[0037] In this embodiment, the parking brake control pipeline 50 and the active brake control pipeline 60 are both provided with a corresponding number of multiple control branch pipelines. The controller 30 controls the multiple control branch pipelines to deliver hydraulic oil to the brake device 70 and output hydraulic oil to the return oil pipeline 20, thereby realizing the controller 30's control over the braking action of the corresponding brake device 70.

[0038] The present invention also includes another embodiment, when the braking system includes multiple braking devices 70, the braking system also includes a plurality of oil supply pipelines 10, oil return pipelines 20 and a plurality of switching valves 40; a plurality of control branch pipelines of the parking brake control pipeline 50 are connected to the output ends of one or more oil supply pipelines 10 and the input ends of one or more oil return pipelines 20 through one or more switching valves 40; a plurality of control branch pipelines of the active braking control pipeline 60, whose input ends are connected to the output ends of one or more oil supply pipelines 10, and whose output ends are connected to the input ends of one or more oil return pipelines 20.

[0039] In the present embodiment, the number of oil supply pipelines 10, oil return pipelines 20 and switching valves 40 is increased. The purpose is to avoid problems such as one oil supply pipeline 10 and one oil return pipeline 20 causing the oil pressure to fail to meet the requirements within the set time or the oil return speed to be slow during the control of the braking action of the multiple braking devices 70 by the controller 30 when multiple braking devices 70 are provided in the braking system. In particular, when the braking system of the embodiment of the present invention is used on an aircraft, each braking device 70 is located at the wheel. Since the front and rear wheels are far apart, if the oil supply pipeline 10 and the oil return pipeline 20 are too concentrated, the transmission distance of the hydraulic oil will be greatly increased, thereby affecting the braking response time and effect.

[0040] In addition, the hydraulic oil output and the oil pressure of the output hydraulic oil of the oil supply pipeline 10 in the embodiment of the present invention are directly related to the distance of the entire pipeline, the pipe diameter and the number of brake devices. Therefore, the embodiment of the present invention refers to the rules of "the larger the pipe diameter, the more hydraulic oil in the pipeline, the slower the pressure transmission", "the shorter the pipeline, the faster the pressure transmission" and "the fewer the number of brake devices, the less pressure dispersion", and sets the oil pressure value of the controller 30 during the braking action control of the brake device 70. It is assumed that one oil supply pipeline 10 supplies oil to N brake devices 70 at the same time. If the oil pressure required for each brake device 70 to perform a braking action is P 1 , and the attenuation of the oil pressure by the pipeline is △P 1 (kpa / m), the output oil pressure of the oil supply pipeline 10 is: P = N*P 1 +△P 1 (s 1 +s 2 +s 3 +…+s N )+P 0 , here s 1 、s 2 、s 3 ,…,s N are the distances between the first, second, third, ..., Nth brake device 70 and the output end of the oil supply pipeline 10. In addition, since one oil supply pipeline 10 supplies oil to N brake devices 70 at the same time, the output end of the oil supply pipeline 10 needs to output a larger amount of oil when branching to different brake devices 70. Therefore, the oil delivery pipe diameter before the output end of the oil supply pipeline 10 is larger than the diameter of the oil delivery pipe from the brake control pipe to the brake device. Due to the difference in pipe diameter, the attenuation of the oil pressure by the pipe is △P 2 (kpa / m), so P in the above formula 0 =△P 2 *s, s is the length of the oil supply pipeline 10 where the oil pressure decays.

[0041] In addition, the hydraulic oil output of the oil supply pipeline 10 in the embodiment of the present invention and the pressure rise and fall rate of the output hydraulic oil pressure are directly related to the length, diameter and number of brake devices of the entire pipeline. Therefore, the embodiment of the present invention refers to the rule that "the longer the pipeline, the larger the diameter, the more brake devices, the slower the pressure rise and fall changes" and "the shorter the pipeline, the thinner the diameter, the fewer brake devices, the faster the pressure rise and fall changes", so that the controller 30 controls the oil pressure value during the braking action control process of the brake device 70. It is assumed that an oil supply pipeline 10 supplies oil to N brake devices 70 at the same time. If the oil pressure required for each brake device 70 to perform a braking action is P 1 The required oil volume is Q 1 , the pressure P is built up per unit length of pipeline1 The required oil is △Q 1 , then the output oil volume of the oil supply pipeline 10 is: Q = N * Q 1 +△Q 1 (s 1 +s 2 +s 3 +…+s N ), where s 1 、s 2 、s 3 ,…,s N They are respectively the pipeline distances between the first, second, third, ..., Nth brake device 70 and the output end of the oil supply pipeline 10 .

[0042] like Figure 2 As shown, an implementation method of the multi-electric and digital valve integrated brake system of an embodiment of the present invention includes an oil supply pipeline 10, an oil return pipeline 20, and two brake devices 70, namely 70a and 70b, and the parking brake control pipeline 50 and the active brake control pipeline 60 are both provided with two control branch pipelines.

[0043] Figure 2 In the embodiment, the oil supply pipeline 10 includes a hydraulic oil tank 101, a hydraulic pump 102, a one-way valve 103 and an accumulator 104 arranged along the flow direction of the oil body; the controller 30 is in communication connection with the hydraulic pump 102; the controller 30 controls the hydraulic pump 102 to extract the hydraulic oil in the hydraulic oil tank 101, and the hydraulic oil is stored in the accumulator 104 and / or delivered to the output end of the oil supply pipeline 10. The hydraulic oil tank 101 stores hydraulic oil, the hydraulic pump 102 is used to extract the hydraulic oil in the hydraulic oil tank 101, and the one-way valve 103 is used to ensure that the hydraulic oil flows from left to right. When the hydraulic pump 102 works to suck oil from the hydraulic oil tank 101, the oil flows into the accumulator 104 through the one-way valve 103, the gas in the accumulator 104 is compressed, and the internal energy increases. When the control branch pipeline is connected, the hydraulic oil in the accumulator 104 can flow along the pipeline to the corresponding brake device 70.

[0044] like Figure 2As shown, in the multi-electric and digital valve integrated brake system of the embodiment of the present invention, the oil supply pipeline 10 also includes a filter 105 and a first pressure sensor 106. The filter 105 is arranged on the pipeline between the hydraulic pump 102 and the one-way valve 103, and is used to filter the hydraulic oil output from the hydraulic pump 102 to prevent impurities in the hydraulic oil from clogging the oil pipeline; the first pressure sensor 106 is communicatively connected to the controller 30, and the first pressure sensor 106 is used to measure the oil pressure value at the output end of the oil supply pipeline 10. Combined with the above description of the hydraulic oil output of the oil supply pipeline 10 and the oil pressure of the output hydraulic oil, the controller 30 can control the hydraulic pump 102 according to the measurement value of the first pressure sensor 106 to achieve the target pressure value.

[0045] A second pressure sensor 701 is provided on the brake device 70 in the embodiment of the present invention; the second pressure sensor 702 is communicated with the controller 30 and is used to measure the oil pressure value of the brake device 70. The controller 30 further controls the hydraulic pump 102 according to the oil pressure value at the brake device 70 to adjust the oil pressure output by the oil supply pipeline 10.

[0046] like Figure 2 As shown, the multi-electric and digital valve integrated brake system of the embodiment of the present invention also includes a first overflow pipe of the first overflow valve 80 and a second overflow pipe including a second overflow valve 90; the first overflow pipe connects the oil supply line 10 and the oil return line 20, and the flow direction is from the output end of the filter 105 to the input end of the oil return line 20; the second overflow pipe is located outside the switching valve 40, connecting the second port 402 and the third port 403, and the flow direction is from the third port 403 to the second port 402. The overflow valve is set to prevent leakage or damage caused by excessive pressure in the oil pipe, ensuring the smooth progress of the braking process.

[0047] like Figure 2 As shown, in the multi-electric and digital valve integrated brake system of the embodiment of the present invention, the oil return line 20 includes a one-way valve and a hydraulic oil tank arranged along the flow direction of the oil body, and the hydraulic oil flows through the one-way valve and is stored in the hydraulic oil tank. The one-way valve of this embodiment and the one-way valve 103 in the aforementioned oil supply line 10 have the same working principle and can also be implemented with the same product. The hydraulic oil tank in this embodiment can be the same as the hydraulic oil tank 101 in the oil supply line 10 in the aforementioned embodiment, so as to realize the recycling of hydraulic oil.

[0048] Specifically, in the multi-electric and digital valve integrated brake system of the embodiment of the present invention, the parking brake control pipeline 50 is an oil pipeline provided with a normally open electric control valve 501, and the controller 30 is in communication connection with the normally open electric control valve. Figure 2As shown in the figure, there are two normally open electric control valves 501, namely normally open electric control valve 501a and normally open electric control valve 501b. The normally open electric control valve 501 is in an open state when no electricity is supplied.

[0049] like Figure 2 As shown, in the parking brake mode, the switching valve 40 is in a state where the first port 401 and the third port 403 are connected, and the controller 30 controls the normally open electric control valve 501a and the normally open electric control valve 502b to be in an open state. The oil in the accumulator 104 in the oil supply pipeline 10 enters the brake device 70 of the wheel through the switching valve 40 and the normally open electric control valve 501 under the action of gas pressure, and the hydraulic oil pressure signal of the wheel is fed back to the controller 30 through the second pressure sensor 701. The controller 30 compares the feedback pressure value with the preset pressure value of the parking brake state until the pressure at the brake device 70 is equal to the preset pressure value, thereby realizing the parking brake of the wheel. By setting multiple sets of the above connection structures, the parking brake of multiple wheels can be realized. In the parking brake mode, the active brake control pipeline 60 is in a closed state.

[0050] Specifically, in the multi-electric and digital valve integrated brake system of the embodiment of the present invention, the active brake control pipeline 60 is an oil pipeline provided with a first normally closed electric control valve 601 and a second normally closed electric control valve 602; the first end of the first normally closed electric control valve 601 is connected to the output end of the oil supply pipeline 10, and the first end of the second normally closed electric control valve 602 is connected to the input end of the return oil pipeline 20; the second end of the first normally closed electric control valve 601 and the second end of the second normally closed electric control valve 602 are connected, and both are connected to the brake device 70. Figure 2 As shown in the figure, there are two first normally closed electrically controlled valves 601 and two second normally closed electrically controlled valves 602, which are respectively the first normally closed electrically controlled valve 601a, the first normally closed electrically controlled valve 601b, the second normally closed electrically controlled valve 602a, and the second normally closed electrically controlled valve 602b. The normally closed electrically controlled valves are in a closed state when no power is supplied.

[0051] like Figure 2As shown, in the active braking mode, the controller 30 controls the switching valve 40 to be in a state where the second port 402 and the third port 403 are connected. At this time, the first port 401 and the third port 403 are not connected, and the hydraulic oil in the oil supply pipeline 10 will not enter the parking brake control pipeline 50. The controller 30 controls the normally open electric control valve 501 to be in a closed state (the controller 30 controls the coil in the normally open electric control valve to be energized), and the normally open electric control valve 501 is connected to the oil return pipeline 20 through the switching valve 40, so that the residual oil in the normally open electric control valve 501 is returned. The controller 30 controls the first normally closed electric control valve 601 to be in an open state (the controller 30 controls the coil in the first normally closed electric control valve 601 to be energized), and the second normally closed electric control valve 602 is in a closed state at this time. The oil in the accumulator 104 enters the brake device 70 of the wheel through the first normally closed electric control valve 601 under the action of gas pressure, and forms a closed-loop control through the second pressure sensor 701 on the wheel.

[0052] When the oil is unloaded in the active braking mode, the controller 30 controls the second normally closed electric control valve 602 to open (the controller 30 controls the coil in the second normally closed electric control valve 602 to be energized), and the hydraulic oil in the brake device 70 flows to the oil return pipeline through the second normally closed electric control valve 602. By setting multiple sets of the above connection structures, active braking and brake oil unloading of multiple wheels can be achieved.

[0053] like Figure 2 As shown, in this solution, the motor M drives the hydraulic pump 102 to charge the accumulator 104 to a predetermined pressure in a relatively short time. During the process of applying the brake to the disc, the pressure of the accumulator 104 will be reduced, and the motor M drives the hydraulic pump 102 to achieve pressure replenishment. In this embodiment, in the parking brake state, the controller 30 only needs to control the switching valve 40 to switch the mode so that the accumulator 104 is connected to the normally open electric control valve 501 to achieve the parking brake of the wheel. The control process is simple and the difficulty of maintenance and debugging is reduced.

[0054] The normally open electric control valve and the normally closed electric control valve in the embodiment of the present invention can both be implemented by electromagnetic valves. The controller 30 controls the opening and closing of the valve by energizing the coil of the electromagnetic valve, thereby completing the process of parking brake and active brake. The normally open electric control valve and the normally closed electric control valve can both use high-speed switch valves. The high-speed switch valve has a high oil contamination resistance level and can effectively avoid failures caused by hydraulic oil contamination. At the same time, the high-speed switch valve has no pilot leakage and can save flow, so it is very advantageous for the hydraulic system of small-flow hydraulic pumps and accumulators, and is also very suitable for shutdown pressure maintenance.

[0055] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in the field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A multi-electric and digital valve integrated brake system, characterized in that: The brake system includes an oil supply pipeline, an oil return pipeline, a controller, a switching valve, a parking brake control pipeline, an active brake control pipeline and at least one brake device; the controller is in communication connection with the oil supply pipeline, the switching valve, the parking brake control pipeline and the active brake control pipeline; the switching valve is provided with a first port, a second port and a third port, wherein: The controller is used to control the oil supply pipeline to output hydraulic oil; The output end of the oil supply pipeline is connected to the input end of the active brake control pipeline; the output end of the oil supply pipeline is also connected to the first port; the second port is connected to the input end of the oil return pipeline, and the third port is connected to the parking brake control pipeline; the output end of the active brake control pipeline is connected to the input end of the oil return pipeline; The controller is also used to control the port connection state of the switching valve. When the first port is connected to the third port, the third port is the input end of the parking brake control pipeline; when the second port is connected to the third port, the third port is the output end of the parking brake control pipeline. At least one of the brake devices is connected to the active brake control pipeline and / or the parking brake control pipeline; the controller is also used to control the active brake control pipeline and the parking brake control pipeline to deliver hydraulic oil to the brake device, and control the active brake control pipeline and the parking brake control pipeline to output hydraulic oil to the return oil pipeline.

2. A multi-electric and digital valve integrated brake system as claimed in claim 1, characterized in that: When the brake system includes a plurality of the brake devices, the parking brake control pipeline and the active brake control pipeline are each provided with a corresponding number of control branch pipelines, and the plurality of control branch pipelines are respectively connected to the plurality of the brake devices; The controller controls the plurality of control branch pipelines to deliver hydraulic oil to the brake device and to output hydraulic oil to the oil return pipeline.

3. A multi-electric and digital valve integrated brake system as claimed in claim 2, characterized in that: When the brake system includes a plurality of the brake devices, the brake system also includes a plurality of the oil supply pipelines, the oil return pipelines and a plurality of switching valves; The plurality of control branch pipelines of the parking brake control pipeline are connected with the output ends of one or more oil supply pipelines and the input ends of one or more oil return pipelines through one or more switching valves; The input ends of the several control branch pipelines of the active brake control pipeline are communicated with the output ends of one or more of the oil supply pipelines, and the output ends of the several control branch pipelines are communicated with the input ends of one or more of the oil return pipelines.

4. A multi-electric and digital valve integrated brake system according to any one of claims 1 to 3, characterized in that: The oil supply pipeline includes a hydraulic oil tank, a hydraulic pump, a one-way valve and an accumulator arranged along the flow direction of the oil body; the controller is in communication connection with the hydraulic pump; The controller controls the hydraulic pump to pump out the hydraulic oil in the hydraulic oil tank, and the hydraulic oil is stored in the accumulator and / or delivered to the output end of the oil supply pipeline.

5. A multi-electric and digital valve integrated brake system as claimed in claim 4, characterized in that: The oil supply pipeline also includes a filter and a first pressure sensor. The filter is arranged on the pipeline between the hydraulic pump and the one-way valve. The first pressure sensor is communicatively connected to the controller and is used to measure the oil pressure value at the output end of the oil supply pipeline.

6. A multi-electric and digital valve integrated brake system as claimed in claim 5, characterized in that: It also includes a first overflow pipe of a first overflow valve and a second overflow pipe including a second overflow valve; the first overflow pipe is connected to the oil supply pipeline and the oil return pipeline, and the flow direction is from the output end of the filter to the input end of the oil return pipeline; the second overflow pipe is located outside the switching valve, connected to the second port and the third port, and the flow direction is from the third port to the second port.

7. A multi-electric and digital valve integrated brake system according to any one of claims 1 to 3, characterized in that: The oil return pipeline includes a one-way valve and a hydraulic oil tank arranged along the flow direction of the oil body. The hydraulic oil flows through the one-way valve and is stored in the hydraulic oil tank.

8. A multi-electric and digital valve integrated brake system according to any one of claims 1 to 3, characterized in that: The parking brake control pipeline is an oil pipeline provided with a normally open electric control valve, and the controller is in communication connection with the normally open electric control valve.

9. A multi-electric and digital valve integrated brake system as claimed in any one of claims 1 to 3, characterized in that: The active brake control pipeline is an oil supply pipeline provided with a first normally closed electrically controlled valve and a second normally closed electrically controlled valve; the first end of the first normally closed electrically controlled valve is connected to the output end of the oil supply pipeline, and the first end of the second normally closed electrically controlled valve is connected to the input end of the oil return pipeline; the second end of the first normally closed electrically controlled valve and the second end of the second normally closed electrically controlled valve are connected, and both are connected to the brake device.

10. A multi-electric and digital valve integrated brake system according to any one of claims 1 to 3, characterized in that: The brake device is provided with a second pressure sensor; the second pressure sensor is in communication connection with the controller and is used for measuring the oil pressure value of the brake device.

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