A multi-electric and digital valve integrated brake system

Abstract

The application 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 parking brake control pipeline, a main 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 main brake control pipeline and a first port, a second port is connected with the input end of the oil return pipeline, a third port is connected with the parking brake control pipeline, the output end of the main brake control pipeline is communicated with the input end of the oil return pipeline, and the at least one brake device is connected with the main brake control pipeline and / or the parking brake control pipeline. In the application, the controller controls the oil supply pipeline, the parking brake control pipeline, the main brake control pipeline and the switching valve, realizes two working modes of parking brake and main brake, and the overall pipeline is simplified, so that the cost is reduced on the basis of ensuring the function.

Description

Technical Field

[0001] This invention relates to the field of braking system technology, and in particular to a multi-electric and digital valve integrated braking system. Background Technology

[0002] Aircraft braking systems have two operating modes: parking brake and active braking. Both modes rely on a multi-electric and digital valve integrated braking system to decelerate or stop the aircraft. These are crucial components of the aircraft braking system and play a key role in ensuring safe parking and deceleration. Parking brake is used when the aircraft is parked on the tarmac for extended periods, locking the braking system to prevent movement. Active braking, on the other hand, is a braking system used during takeoff and landing to decelerate and stop the aircraft.

[0003] Existing aircraft braking system solutions do not combine the two working modes of parking braking and active braking into a single solution. Furthermore, most of them use rotary direct-drive servo valves as braking elements, which are complex in structure, costly, have a large leakage rate, and require a large accumulator size.

[0004] Given the above problems, how to simplify the structure of aircraft braking systems and reduce costs is an urgent issue to be addressed. Summary of the Invention

[0005] To address the technical problems in the prior art, the present invention provides a multi-electric and digital valve integrated braking system.

[0006] This invention discloses a multi-electric and digital valve integrated braking system, comprising an oil supply line, an oil return line, a controller, a switching valve, a stop brake control line, an active brake control line, and at least one braking device; the controller is communicatively connected to the oil supply line, the switching valve, the stop brake control line, and the active brake control line; the switching valve has a first port, a second port, and a third port, wherein:

[0007] The controller is used to control the output of hydraulic oil from the oil supply line;

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

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

[0010] At least one of the braking devices is connected to the active braking control line and / or the stop braking control line; the controller is also used to control the active braking control line and the stop braking control line to supply hydraulic oil to the braking device, and to control the active braking control line and the stop braking control line to output hydraulic oil to the return line.

[0011] Furthermore, when the braking system includes multiple braking devices, both the stop brake control line and the active brake control line are provided with a corresponding number of multiple control branch lines, and the multiple control branch lines are respectively connected to the multiple braking devices.

[0012] The controller controls multiple control branch lines to supply hydraulic oil to the braking device and to output hydraulic oil to the return line.

[0013] Furthermore, when the braking system includes multiple braking devices, the braking system also includes several oil supply lines, oil return lines, and several switching valves;

[0014] Several control branch lines of the stop brake control line are connected to the output end of one or more of the oil supply lines and the input end of one or more of the oil return lines through one or more of the switching valves;

[0015] The input ends of several control branch lines of the active braking control line are connected to the output ends of one or more of the oil supply lines, and the output ends are connected to the input ends of one or more of the oil return lines.

[0016] Furthermore, the oil supply pipeline includes a hydraulic oil tank, a hydraulic pump, a check valve, and an accumulator arranged along the oil flow direction; the controller is communicatively connected to the hydraulic pump.

[0017] The controller controls the hydraulic pump to extract hydraulic oil from 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 line also includes a filter and a first pressure sensor. The filter is disposed on the pipeline between the hydraulic pump and the check 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 line.

[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 line and the oil return line, and the flow direction is from the output end of the filter to the input end of the oil return line; 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 return oil pipeline includes a one-way valve arranged along the oil flow direction and a hydraulic oil tank, and the hydraulic oil flows through the one-way valve and is stored in the hydraulic oil tank.

[0021] Furthermore, the shutdown brake control pipeline is an oil supply pipeline equipped with a normally open electrically controlled valve, and the controller is communicatively connected to the normally open electrically controlled valve.

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

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

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

[0025] (1) By connecting the output end of the oil supply line to the input end of the active braking control line, connecting the output end of the active braking control line to the input end of the return oil line, and connecting at least one braking device to the active braking control line, when active braking is performed, the controller controls the oil supply line to output hydraulic oil and also controls the active braking control line to deliver hydraulic oil to the braking device, so as to realize the active braking of the braking device during the take-off and landing of the aircraft. When active braking is canceled, the controller controls the active braking control line to output hydraulic oil to the return oil line to realize the oil unloading process.

[0026] (2) The switching valve has a first port, a second port and a third port. The output end of the oil supply line 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 return oil line, and the third port of the switching valve is connected to the stop brake control line. The stop brake control line is connected to the brake device. The controller controls the port connection state of the switching valve. When the stop brake is applied, the controller controls the first port and the third port to connect. The third port becomes the input end of the stop brake control line. The controller controls the oil supply line to output hydraulic oil to the stop brake control line. The controller controls the stop brake control line to deliver hydraulic oil to the brake device, thereby achieving the locking brake when the aircraft is parked. When the stop brake is canceled, the controller controls the second port and the third port to connect. The third port becomes the output end of the stop brake control line. The controller then controls the stop brake control line to output hydraulic oil to the return oil line, thereby achieving the oil unloading process.

[0027] (3) The multi-electric and digital valve integrated braking system of the present invention combines the two working modes of shutdown braking and active braking into one solution. The two share the oil supply line and the oil return line. The controller realizes the two working modes of shutdown braking and active braking by controlling the oil supply line, the shutdown braking control line, the active braking control line 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 and further reduces the cost while ensuring the function. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0033] An embodiment of the present invention provides a multi-electric and digital valve integrated braking system, such as... Figure 1 As shown, the braking system includes an oil supply line 10, an oil return line 20, a controller 30, a switching valve 40, a stop brake control line 50, an active brake control line 60, and at least one braking device 70; the controller 30 is communicatively connected to the oil supply line 10, the switching valve 40, the stop brake control line 50, and the active brake control line 60. Figure 1The connection between the dashed line and the controller 30 refers to a communication connection, including the controller 30's receipt of information and issuance of relevant control commands. In this embodiment, the switching valve 40 has a first port 401, a second port 402, and a third port 403. The controller 30 controls the hydraulic oil output from the oil supply line 10; 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 stop 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 also controls the port connection status of the switching valve 40. When the first port 401 and the third port 403 are connected, the third port 403 is the input terminal of the stop brake control line 50; when the second port 402 and the third port 403 are connected, the third port 403 is the output terminal of the stop brake control line 50; at least one brake device 70 is connected to the active brake control line 60 and / or the stop brake control line 50; the controller 30 is also used to control the active brake control line 60 and the stop brake control line 50 to supply hydraulic oil to the brake device 70, and to control the active brake control line 60 and the stop brake control line 50 to output hydraulic oil to the return line 20.

[0034] In this embodiment of the invention, the controller 30 controls the hydraulic oil supply line 10 to output hydraulic oil, ultimately increasing the oil pressure at the brake device 70 to achieve the braking purpose of the wheels. The output volume and pressure of the hydraulic oil in the hydraulic oil supply line 10 need to be considered in conjunction 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, by connecting the output end of the hydraulic oil supply line 10 to the input end of the active brake control line 60, connecting the output end of the active brake control line 60 to the input end of the return line 20, and connecting at least one brake device 70 to the active brake control line 60, during active braking, the controller 30 controls the hydraulic oil supply line 10 to output hydraulic oil, and also controls the active brake control line 60 to supply hydraulic oil to the brake device 70, realizing active braking of the brake device 70 during aircraft takeoff, landing, etc. When active braking is canceled, the controller 30 controls the active brake control line 60 to output hydraulic oil to the return line 20 to realize the oil unloading process. Furthermore, the output end of the oil supply line 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 return oil line 20, and the third port 403 is connected to the stop brake control line 50, which is connected to the brake device 70. The controller 30 controls the port connection state of the switching valve 40. When the stop brake is applied, the controller 30 controls the first port 401 and the third port 403 to connect, and the third port 403 serves as the input end of the stop brake control line 50. The controller 30 controls the oil supply line 10 to output hydraulic oil to the stop brake control line 50. The controller 30 controls the stop brake control line 50 to supply hydraulic oil to the brake device 70, so as to realize the locking brake when the aircraft is parked. When the stop brake is canceled, the controller 30 controls the second port 402 and the third port 403 to connect. The third port 403 is the output end of the stop brake control line 50. The controller 30 then controls the stop brake control line 50 to output hydraulic oil to the return oil line 20, so as to realize the oil unloading process.

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

[0036] In another embodiment of the present invention, the braking system includes multiple braking devices 70. In this case, both the stop brake control line 50 and the active brake control line 60 are provided with a corresponding number of control branch lines, which are respectively connected to the multiple braking devices 70. The controller 30 controls the multiple control branch lines to supply hydraulic oil to the braking devices 70 and to output hydraulic oil to the return line 20. In this embodiment, taking a braking system including N braking devices 70 as an example, N1 braking devices are designed to operate in stop brake mode, and N2 braking devices are designed to operate in active brake mode. Here, the values ​​of N1 and N2 are both less than or equal to N. In other words, all braking devices 70 can operate in both stop brake mode and active brake mode, or some braking devices 70 can operate only in stop brake mode or active brake mode. The specific values ​​of N, N1, and N2 are determined according to the arrangement and number of braking devices 70 in the braking system and the braking requirements; this embodiment does not impose specific limitations.

[0037] In this embodiment, both the stop brake control line 50 and the active brake control line 60 are provided with a corresponding number of control branch lines. The controller 30 controls the multiple control branch lines to deliver hydraulic oil to the brake device 70 and to output hydraulic oil to the return line 20, so as to realize the controller 30's control of the braking action of the corresponding brake device 70.

[0038] The present invention also includes another embodiment in which, when the braking system includes multiple braking devices 70, the braking system further includes several oil supply lines 10, oil return lines 20, and several switching valves 40; several control branch lines of the stop brake control line 50 are connected to the output end of one or more oil supply lines 10 and the input end of one or more oil return lines 20 through one or more switching valves 40; several control branch lines of the active brake control line 60 have their input ends connected to the output ends of one or more oil supply lines 10 and their output ends connected to the input ends of one or more oil return lines 20.

[0039] In this embodiment, the number of oil supply lines 10, oil return lines 20, and switching valves 40 has been increased. The purpose is to avoid problems such as insufficient oil pressure or slow oil return speed caused by a single oil supply line 10 and a single oil return line 20 during the control of multiple braking devices 70 by the controller 30 during the braking action of multiple braking devices 70. In particular, when the braking system of this embodiment is applied to an aircraft, each braking device 70 is located at the wheels. Since the front and rear wheels are far apart, if the oil supply lines 10 and oil return lines 20 are too concentrated, the transmission distance of the hydraulic oil will be greatly increased, thereby affecting the braking response time and effect.

[0040] Furthermore, the hydraulic oil output and output hydraulic oil pressure of the oil supply line 10 in this embodiment are directly related to the distance, diameter, and number of braking devices of the entire pipeline. Therefore, this embodiment refers to the principles that "the larger the pipe diameter, the more hydraulic oil in the pipeline, and the slower the pressure transmission," "the shorter the pipeline, the faster the pressure transmission," and "the fewer the number of braking devices, the less pressure dispersion," and sets the oil pressure value of the controller 30 during the braking action control process of the braking device 70. Assuming that one oil supply line 10 supplies oil to N braking devices 70 simultaneously, if the oil pressure required for each braking device 70 to perform the braking action is P1, and the oil pressure attenuation due to the pipeline is ΔP1 (kPa / m), then the output oil pressure of the oil supply line 10 is: P=N*P1+ΔP1(s1+s2+s3+…+s N )+P0, where s1, s2, s3, ..., s N These are the distances between the output ends of the oil supply lines 10 and the 1st, 2nd, 3rd, ..., Nth brake devices 70, respectively. Furthermore, since one oil supply line 10 supplies oil to N brake devices 70 simultaneously, the output end of the oil supply line 10 needs to output a larger amount of oil when branching to different brake devices 70. Therefore, the diameter of the oil supply line 10 before the output end is larger than the diameter of the oil supply line between the brake control line and the brake device. Due to the difference in diameter, the oil pressure attenuation in the line is ΔP2 (kPa / m). Therefore, P0 = ΔP2 * s in the above formula, where s is the length of the oil supply line 10 where the oil pressure attenuation occurs.

[0041] Furthermore, the hydraulic oil output and pressure rise / fall rate of the hydraulic oil in the oil supply line 10 in this embodiment are directly related to the length, diameter, and number of braking devices of the entire pipeline. Therefore, this embodiment refers to the principle that "the longer the pipeline, the larger the diameter, the more braking devices, the slower the pressure rise / fall rate" and "the shorter the pipeline, the smaller the diameter, the fewer the number of braking devices, the faster the pressure rise / fall rate," so that the controller 30 controls the oil pressure value during the braking action control process of the braking device 70. Assuming that one oil supply line 10 supplies oil to N braking devices 70 simultaneously, if the oil pressure required for each braking device 70 to perform the braking action is P1, the required oil volume is Q1, and the oil volume required to build up pressure P1 per unit length of pipeline is ΔQ1, then the output oil volume of the oil supply line 10 is: Q=N*Q1+ΔQ1(s1+s2+s3+…+s N ), here s1, s2, s3, ..., s N These are the distances between the output ends of the oil supply lines 10 and the 1st, 2nd, 3rd, ..., Nth brake devices 70.

[0042] like Figure 2As shown, this is one embodiment of the multi-electric and digital valve integrated braking system of the present invention, which includes an oil supply line 10, an oil return line 20, and two braking devices 70, namely 70a and 70b. The stop brake control line 50 and the active brake control line 60 are each provided with two control branch lines.

[0043] Figure 2 In this system, the oil supply pipeline 10 includes a hydraulic oil tank 101, a hydraulic pump 102, a check valve 103, and an accumulator 104 arranged along the oil flow direction. The controller 30 is communicatively connected to the hydraulic pump 102. The controller 30 controls the hydraulic pump 102 to draw hydraulic oil from 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, and the hydraulic pump 102 is used to draw hydraulic oil from the hydraulic oil tank 101. The check valve 103 is used to ensure that the hydraulic oil flows from left to right. When the hydraulic pump 102 works, it draws oil from the hydraulic oil tank 101, and the oil flows into the accumulator 104 through the check 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 2 As shown, in the multi-electric and digital valve integrated braking system of this embodiment of the invention, the oil supply line 10 further includes a filter 105 and a first pressure sensor 106. The filter 105 is disposed 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 supply pipeline. The first pressure sensor 106 is communicatively connected to the controller 30 and is used to measure the oil pressure value at the output end of the oil supply line 10. Combined with the foregoing description of the hydraulic oil output and the oil pressure of the output hydraulic oil in the oil supply line 10, 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] In this embodiment of the invention, the brake device 70 is provided with a second pressure sensor 701; the second pressure sensor 702 is communicatively connected to 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 line 10.

[0046] like Figure 2As shown, the multi-electric and digital valve integrated braking system of this embodiment of the invention further includes a first overflow pipe of a 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, connects 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 excessive pressure in the oil pipe from causing leakage or damage, and to ensure smooth braking.

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

[0048] Specifically, in the multi-electric and digital valve integrated braking system of this embodiment, the stop brake control pipeline 50 is an oil supply pipeline equipped with a normally open electrically controlled valve 501, and the controller 30 is communicatively connected to the normally open electrically controlled valve. For example... Figure 2 As shown in the figure, there are two normally open electrically controlled valves 501, namely normally open electrically controlled valve 501a and normally open electrically controlled valve 501b. The normally open electrically controlled valves 501 are in the open state when no power is applied.

[0049] like Figure 2 As shown, in the stop-braking mode, the switching valve 40 is connected to the first port 401 and the third port 403. The controller 30 controls the normally open electrically controlled valves 501a and 502b to be open. The oil in the accumulator 104 in the oil supply line 10 enters the brake device 70 of the turbine wheel under the action of gas pressure through the switching valve 40 and the normally open electrically controlled valve 501. The hydraulic oil pressure signal of the turbine 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 for the stop-braking state until the pressure at the brake device 70 equals the preset pressure value, thereby realizing the stop-braking of the turbine wheel. By setting multiple sets of the above connection structure, the stop-braking of multiple turbine wheels can be achieved. In the stop-braking mode, the active brake control line 60 is in the closed state.

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

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

[0052] During active braking mode oil unloading, the controller 30 controls the second normally closed solenoid valve 602 to open (the controller 30 energizes the coil in the second normally closed solenoid valve 602), and the hydraulic oil in the braking device 70 flows to the return oil line through the second normally closed solenoid 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 2As shown, in this scheme, the motor M drives the hydraulic pump 102 to charge the accumulator 104 to the predetermined pressure in a short time. During the braking disc process, the pressure of the accumulator 104 will decrease, and the motor M drives the hydraulic pump 102 to replenish the pressure. In this embodiment, under the stop braking 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 solenoid valve 501 to realize the stop braking of the wheel. The control process is simple and reduces the difficulty of maintenance and debugging.

[0054] In this embodiment of the invention, both the normally open and normally closed electrically controlled valves can be implemented using solenoid valves. The controller 30 controls the opening and closing of the valve by energizing the coil of the solenoid valve, thereby completing the process of stopping braking and active braking. Both the normally open and normally closed electrically controlled valves can be high-speed switching valves. High-speed switching valves have a high resistance to oil contamination, which can effectively avoid failures caused by hydraulic oil contamination. At the same time, high-speed switching valves have no pilot leakage, which can save flow. Therefore, they are very advantageous for hydraulic systems with small flow rates of hydraulic pumps and accumulators, and are also very suitable for pressure holding during shutdown.

[0055] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the nature and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention.

Claims

1. A multi-electric and digital valve integrated braking system, characterized in that, The braking system includes an oil supply line, an oil return line, a controller, a switching valve, a stop brake control line, an active brake control line, and at least one braking device; the controller is communicatively connected to the oil supply line, the switching valve, the stop brake control line, and the active brake control line; the switching valve has a first port, a second port, and a third port, wherein: The controller is used to control the output of hydraulic oil from the oil supply pipeline; The output end of the oil supply line is connected to the input end of the active brake control line; the output end of the oil supply line is also connected to the first port; the second port is connected to the input end of the return oil line, and the third port is connected to the stop brake control line; the output end of the active brake control line is connected to the input end of the return oil line. The controller is also used to control the port connection state of the switching valve. When the first port and the third port are connected, the third port is the input end of the stop brake control line; when the second port and the third port are connected, the third port is the output end of the stop brake control line. At least one of the braking devices is connected to the active braking control line and / or the stop braking control line; the controller is also used to control the active braking control line and the stop braking control line to supply hydraulic oil to the braking device, and to control the active braking control line and the stop braking control line to output hydraulic oil to the return line; The shutdown brake control pipeline is an oil supply pipeline equipped with a normally open electrically controlled valve. The switching valve and the normally open electrically controlled valve are connected in series between the oil supply pipeline and the brake device. The normally open electrically controlled valve is in the open state when it is not energized. The controller is communicatively connected to the normally open electrically controlled valve. The active braking control pipeline is an oil supply pipeline equipped with a first normally closed solenoid valve and a second normally closed solenoid valve; the first end of the first normally closed solenoid valve is connected to the output end of the oil supply pipeline, and the first end of the second normally closed solenoid valve is connected to the input end of the return oil pipeline; the second ends of the first normally closed solenoid valve and the second normally closed solenoid valve are connected and both are connected to the braking device. The normally open electrically controlled valve, the first normally closed electrically controlled valve, and the second normally closed electrically controlled valve are all high-speed switching valves; The braking system also includes a second overflow pipe of a second overflow valve, the second overflow pipe being located outside the switching valve, connecting the second port and the third port, and the flow direction being from the third port to the second port; In the shutdown braking mode, the first port of the switching valve is connected to the third port. The oil output from the oil supply line enters the braking device through the switching valve and the normally open solenoid valve. The pressure of the shutdown braking control line is controlled by the second relief valve. When the pressure exceeds the set pressure of the second relief valve, the oil is depressurized through the second relief pipe. In active braking mode, the second port of the switching valve is connected to the third port, cutting off the oil circuit between the oil supply line and the stop brake control line; The controller is further configured to control the output oil pressure and output oil volume of the oil supply line based on the number of the braking devices, the pipeline distance between each braking device and the output end of the oil supply line, and the difference in pipeline diameter. The output oil pressure is calculated using the following formula: P=N P1+△P1(s1+s2+s3+…+s N )+P0; Where P is the output oil pressure, N is the number of the braking devices, P1 is the oil pressure required for each of the braking devices to perform braking action, ΔP1 is the attenuation of the output oil pressure per unit length of pipeline, P0 is the additional pressure attenuation caused by the difference in pipeline diameter, and s1, s2, s 3、 …s N These are the distances between the 1st, 2nd, 3rd, ..., Nth brake devices and the output end of the oil supply line, respectively. The output oil volume is calculated using the following formula: Q=N Q1+△Q1(s1+s2+s3+…+s N ); in, For the output oil volume, Q1 is the amount of oil required for each of the aforementioned braking devices to perform braking action, and △Q1 is the amount of oil required to build up pressure P1 per unit length of pipeline.

2. The multi-electric and digital valve integrated braking system as described in claim 1, characterized in that, When the braking system includes multiple braking devices, both the stop brake control line and the active brake control line are provided with a corresponding number of multiple control branch lines, and the multiple control branch lines are respectively connected to the multiple braking devices. The controller controls multiple control branch lines to supply hydraulic oil to the braking device and to output hydraulic oil to the return line.

3. The multi-electric and digital valve integrated braking system as described in claim 2, characterized in that, When the braking system includes multiple braking devices, the braking system also includes several oil supply lines, oil return lines, and several switching valves; Several control branch lines of the stop brake control line are connected to the output end of one or more of the oil supply lines and the input end of one or more of the oil return lines through one or more of the switching valves; The input ends of several control branch lines of the active braking control line are connected to the output ends of one or more of the oil supply lines, and the output ends are connected to the input ends of one or more of the oil return lines.

4. A multi-electric and digital valve integrated braking system as described in any one of claims 1 to 3, characterized in that, The oil supply pipeline includes a hydraulic oil tank, a hydraulic pump, a check valve, and an accumulator arranged along the oil flow direction; the controller is communicatively connected to the hydraulic pump. The controller controls the hydraulic pump to extract hydraulic oil from 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. The multi-electric and digital valve integrated braking system as described in claim 4, characterized in that, The oil supply line also includes a filter and a first pressure sensor. The filter is installed on the line between the hydraulic pump and the check valve. The first pressure sensor is communicatively connected to the controller and is used to measure the oil pressure at the output end of the oil supply line.

6. The multi-electric and digital valve integrated braking system as described in claim 5, characterized in that, It also includes a first overflow pipe of a first overflow valve; the first overflow pipe connects the oil supply line and the oil return line, and the flow direction is from the output end of the filter to the input end of the oil return line.

7. A multi-electric and digital valve integrated braking system as described in any one of claims 1 to 3, characterized in that, The return oil pipeline includes a one-way valve arranged along the oil flow direction and a hydraulic oil tank. 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 braking system as described in any one of claims 1 to 3, characterized in that, The braking device is equipped with a second pressure sensor; the second pressure sensor is communicatively connected to the controller and is used to measure the oil pressure value of the braking device.

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