Two-way oil source switching control method and device for aircraft hydraulic system

Abstract

The invention discloses a double-path oil source switching control method and device for an aircraft hydraulic system, and particularly relates to the field of brake control. Comprising the steps that the state of an aircraft is obtained, and when it is determined that the aircraft is in a braking state, an opening instruction is sent to a current channel of a two-way oil source conversion device; the working state of a current channel of the double-path oil source conversion device is collected, and when it is determined that the working state is a normal state, the current channel is conducted; an oil source starting state signal and an oil source working state signal of a current channel are collected, and when it is determined that the oil source starting state signal and the oil source working state signal are effective, an oil source pressure voltage signal and a brake pressure signal are collected; and when it is determined that the oil source pressure reaches the first preset condition and the brake pressure reaches the second preset condition, the current channel is switched. On the basis of the method, it can be guaranteed that when any system oil source breaks down, the other system oil source can be switched to be output in time, and it is guaranteed that the pressure of the system oil source input into the anti-skid brake control system is normal.

Description

Technical Field

[0001] The present application relates to the field of brake control, and in particular to a method and device for controlling dual-path oil source conversion in an aircraft hydraulic system. Background Art

[0002] An aircraft's wheel brake system is an integral part of the aircraft's landing and takeoff systems. It plays a vital role during landing, takeoff, taxiing, and ground taxiing, ensuring safe takeoff and landing. Its primary function is to minimize braking distance during landing, bringing the aircraft to a stop as quickly as possible. The reliability of the aircraft's wheel brake system depends on the proper output of the aircraft's hydraulic system.

[0003] The existing electric brake control system only judges the oil source pressure signal of the current channel when performing system oil source control. If the system oil source pressure on the aircraft is unstable or when the oil source pressure signal on the aircraft fluctuates abnormally or fails, the oil source pressure signal collected by the system is unstable or fails, which can easily cause misjudgment of the brake system, affect the switching of the system oil source, and affect the function of the brake system. Summary of the Invention

[0004] The main purpose of this application is to provide a dual-path oil source conversion control method and device for an aircraft hydraulic system, aiming to solve the problem that the existing electric brake control system is prone to misjudgment of the brake system and thus brake failure.

[0005] To achieve the above-mentioned purpose, the present application provides a dual-channel oil source conversion control method for an aircraft hydraulic system, which is used to control a dual-channel oil source conversion device, including: obtaining the status of the aircraft, and when it is determined that the aircraft is in a braking state, issuing an open command to the current channel of the dual-channel oil source conversion device; collecting the working status of the current channel of the dual-channel oil source conversion device, and when it is determined that the working status is normal, turning on the current channel; collecting the oil source start-up status signal and the oil source working status signal of the current channel, and when it is determined that the oil source start-up status signal and the oil source working status signal are valid, collecting the oil source pressure voltage signal and the brake pressure signal; when it is determined that the oil source pressure reaches a first preset condition and the brake pressure reaches a second preset condition, switching the current channel.

[0006] Optionally, after collecting the oil source pressure voltage signal and the brake pressure signal, the method also includes: when it is determined that the oil source pressure does not reach the first preset condition or the brake pressure does not reach the second preset condition, collecting the working status of the current channel of the dual-channel oil source conversion device, and when it is determined that the working status is a fault state, switching the current oil source channel.

[0007] Optionally, the aircraft is in a braking state as follows: when the aircraft parking brake signal is high, the automatic brake signal is high, or the command sensor signal is greater than 1.5V and the speed voltage is greater than 0.2V, it is determined that the anti-skid brake system is in a braking state.

[0008] Optionally, after collecting the oil source startup status signal and the oil source working status signal of the current channel, the method further includes: switching the current oil source channel when it is determined that the oil source startup status signal or the oil source working status signal is invalid.

[0009] Optionally, the working state of the current channel of the dual-channel oil source conversion device is determined as follows: when it is determined that the working voltage of the current channel of the dual-channel oil source conversion device is greater than 24V or less than 16V, the working state is determined to be a fault state.

[0010] Optionally, collecting the working status of the current channel of the dual-channel oil source conversion device includes: performing level conversion on the opening instruction and performing signal shaping; converting the shaped signal into a control signal, and using the control signal as the working status of the current channel.

[0011] Optionally, switching the current channel includes: sending a close command to the current channel and an open command to the next channel, taking the next channel as the current channel, and re-collecting the working status of the current channel of the dual-channel oil source conversion device until braking is completed.

[0012] To achieve the above-mentioned purpose, the present application also provides a dual-channel oil source conversion control device for an aircraft hydraulic system, comprising: an instruction sending module, used to obtain the status of the aircraft, and when it is determined that the aircraft is in a braking state, send an open instruction to the current channel of the dual-channel oil source conversion device; a channel control module, used to collect the working status of the current channel of the dual-channel oil source conversion device according to the open instruction, and when it is determined that the working status is normal, turn on the current channel; a signal acquisition module, used to collect the oil source start-up status signal and the oil source working status signal of the current channel, and when it is determined that the oil source start-up status signal and the oil source working status signal are valid, collect the oil source pressure voltage signal and the brake pressure signal; a channel switching module, used to switch the current channel when it is determined that the oil source pressure reaches a first preset condition and the brake pressure reaches a second preset condition.

[0013] Optionally, the channel control module includes: a level conversion circuit, the input end of which is connected to the output end of the processor, for level conversion of the control instructions output by the processor; a signal shaping circuit, the input end of which is connected to the output end of the level conversion circuit, for shaping the converted level signal; an optocoupler control circuit, the input end of which is connected to the output end of the signal shaping circuit, and the output end of which is connected to the dual-channel oil source conversion device, for converting the shaped signal into a control signal; a fault collection circuit, the input end of which is connected to the output end of the optocoupler control circuit, and the output end of which is connected to the processor, for collecting control signals and using the control signals as the working status of the current channel of the dual-channel oil source conversion device.

[0014] Optionally, the fault acquisition circuit includes: a fault recovery circuit, whose input end is connected to the output end of the optocoupler control circuit and is used to collect the control signal; and a fault level conversion circuit, whose input end is connected to the fault recovery circuit and is used to perform level conversion on the control signal.

[0015] Compared with the prior art, the present invention has the following advantages: The aircraft hydraulic system dual-channel oil source switching control method of the present invention performs a comprehensive judgment on the oil source of the current channel based on the oil source startup status signal, the oil source working status signal, the oil source pressure voltage signal, and the brake pressure signal, thereby avoiding the influence of the system oil source switching due to the misjudgment of the brake system and improving the stability and reliability of the brake control system.

[0016] The aircraft hydraulic system dual-channel oil source conversion control device of the present invention transmits the control signal output by the processor to the dual-channel oil source conversion device through the channel control module, and monitors and controls the working status of the dual-channel oil source conversion device. It can ensure that when any system oil source fails, it can be switched to the other output in time to ensure that the system oil source pressure input to the anti-skid brake control system is normal; it ensures the reliability of the hydraulic system oil source and avoids the failure of the anti-skid brake system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of a dual-channel oil source conversion control method for an aircraft hydraulic system according to the present application; Figure 2 The diagram is a structural diagram of a dual-channel oil source conversion control device for an aircraft hydraulic system.

[0018] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0020] The first embodiment of the present invention provides a dual oil source conversion control method for an aircraft hydraulic system, which is used to control a dual oil source conversion device, such as Figure 1 As shown, the specific steps include: Step S1, obtaining the state of the aircraft, and when it is determined that the aircraft is in a braking state, sending an opening instruction to the current channel of the dual-path oil source conversion device; Specifically, the aircraft's status is collected in real time by the anti-skid brake control box in the aircraft's anti-skid brake system. The anti-skid brake control box sends the aircraft's status directly to the DSP processor. When the aircraft is in the braking state, the DSP processor sends an open command to the current channel of the dual-channel oil source conversion device; Furthermore, the braking state is determined by determining that the anti-skid brake system is in the braking state when the aircraft parking brake signal is high, the automatic brake signal is high, or the command sensor signal is greater than 1.5V and the speed voltage is greater than 0.2V (normal braking); Step S2, collecting the working status of the current channel of the dual-channel oil source conversion device, and when it is determined that the working status is normal, conducting the current channel; Specifically, the channel control module of the current channel performs level conversion on the open instruction and performs signal shaping; the shaped signal is converted into a control signal, and the control signal is used as the working state of the current channel; when it is determined that the voltage of the control signal is within the normal range, the working state of the current channel is determined to be normal, and the current channel is turned on; if the voltage of the control signal is not within the normal range, the working state of the current channel is determined to be a fault state, and the processor returns to step S1 to send an open instruction to the next channel. Exemplarily, a dual-channel oil source conversion device includes channel 1 and channel 2. When it is determined that the voltage of the control signal of channel 1 is between 16-24V, the working state of channel 1 is determined to be normal, and channel 1 is turned on. Otherwise, an open instruction is sent to channel 2, and it is determined that the voltage of the control signal of channel 2 is within the normal range. In this case, channel 2 is turned on. Channel 1 and channel 2 are independent of each other, and the oil source can be switched from channel 1 to channel 2, or from channel 2 to channel 1.

[0021] It's understood that the current channel's operating status refers to the control channel corresponding to the channel controlling the dual-source oil conversion device, i.e., the channel that controls whether the current channel is open or closed. The brake circuit outputs a (0-50) mA brake current signal to the brake servo valve, and the processor transmits an open command to the channel control module for channel 1, controlling the opening of channel 1 in the dual-source oil conversion device.

[0022] Step S3, collecting the oil source start-up status signal and the oil source working status signal of the current channel, and when it is determined that the oil source start-up status signal and the oil source working status signal are valid, collecting the oil source pressure voltage signal and the brake pressure signal; The oil source channel startup status signal is the operating signal from the onboard oil source pump, and the oil source operating status signal is the signal collected by the onboard electromechanical system. The processor, connected to the onboard oil source pump and the signal machine's electromechanical system, can obtain the oil source startup status signal and the oil source operating status signal, respectively. The oil source acquisition circuit converts the collected system oil source pressure (0-21) MPa into an oil source pressure voltage signal (0-5). The processor, connected to the oil source acquisition circuit, can obtain the oil source pressure voltage signal.

[0023] Step S4, when it is determined that the oil source pressure reaches the first preset condition and the brake pressure reaches the second preset condition, the current oil source channel is switched; illustratively, the first preset condition is that the oil source pressure is less than 19MPa, and the second preset condition is that the left and right brake pressures are less than the normal brake pressure of 8MPa.

[0024] Alternatively, when it is determined that the oil source pressure does not reach the first preset condition or the brake pressure does not reach the second preset condition, the working status of the current channel of the dual-channel oil source conversion device is collected, and when it is determined that the working status is a fault state, the current oil source channel is switched.

[0025] Alternatively, when it is determined that the oil source startup state signal or the oil source working state signal is invalid, the current oil source channel is switched.

[0026] Specifically, the switching process includes: sending a closing command to the current channel and an opening command to the next channel, taking the next channel as the current channel, and re-collecting the working status of the current channel of the dual-channel oil source conversion device until the braking is completed.

[0027] For example, if the current channel is channel 1, the channel control module detects the voltage of the control signal of channel 1 in real time. When the voltage of the control signal is not between 16-24V, it determines that the working state of channel 1 is a fault, and sends a close command to channel 1. At the same time, it returns to step S1, sends an open command to channel 2, takes channel 2 as the current channel, and executes steps S2-4.

[0028] A second embodiment of the present invention provides a dual-channel oil source conversion control device for an aircraft hydraulic system, comprising an instruction sending module, a channel control module, a signal acquisition module, and a channel switching module; wherein the instruction sending module is used to obtain the status of the aircraft, and when it is determined that the aircraft is in a braking state, sends an opening instruction to the current channel of the dual-channel oil source conversion device; the channel control module is used to collect the working status of the current channel of the dual-channel oil source conversion device according to the opening instruction, and when it is determined that the working status is normal, turns on the current channel; the signal acquisition module is used to collect the oil source start-up status signal and the oil source working status signal of the current channel, and when it is determined that the oil source start-up status signal and the oil source working status signal are valid, collects the oil source pressure voltage signal and the brake pressure signal; the channel switching module is used to switch the current channel when it is determined that the oil source pressure reaches a first preset condition and the brake pressure reaches a second preset condition.

[0029] In this embodiment, the instruction sending module, the signal acquisition module and the channel switching module are all integrated into the processor DSP, that is, the functions of the instruction sending module, the signal acquisition module and the channel switching module are all implemented by the processor DSP.

[0030] Specifically, the channel control module includes a level conversion circuit, a signal shaping circuit, an optocoupler control circuit, and a fault acquisition circuit; wherein, the input end of the level conversion circuit is connected to the output end of the processor, and is used to level convert the control instructions output by the processor; the level conversion circuit converts the input 3.3V level signal (i.e., control instruction, including open instruction and close instruction) into a 5V second level signal to adapt to the dual-channel oil source conversion device.

[0031] It is worth noting that the level conversion circuit, signal shaping circuit, optocoupler control circuit, and fault collection circuit all use existing disclosed circuits and do not fall within the scope of protection of this application. The circuit itself has not been improved. As long as it can achieve the functions specified in this embodiment, it will not be repeated here.

[0032] The input end of the signal shaping circuit is connected to the output end of the level conversion circuit, and is used to perform signal shaping on the converted level signal to avoid abnormal output caused by signal instability.

[0033] The input end of the optocoupler control circuit is connected to the output end of the signal shaping circuit, and the output end is connected to the dual-channel oil source conversion device, which is used to convert the shaped signal into a control signal, control the channel of the dual-channel oil source conversion device, and control the dual-channel oil source conversion device to be turned on / off.

[0034] The fault acquisition circuit has an input connected to the output of the optocoupler control circuit, and an output connected to a processor. The circuit is used to collect control signals and use them as the operating status of the current channel of the dual-channel oil source conversion device to detect faults in the control channel of the dual-channel oil source conversion device. Furthermore, the fault acquisition circuit includes a fault recovery circuit and a fault level conversion circuit. The input of the fault recovery circuit is connected to the output of the optocoupler control circuit to collect control signals, while the input of the fault level conversion circuit is connected to the fault recovery circuit to perform level conversion on the control signals.

[0035] The working status of the dual-channel oil source conversion device is collected in real time through the fault recovery circuit and the fault level conversion circuit. When the fault recovery circuit detects that the working voltage of the oil source conversion device is greater than 24V or less than 16V, it outputs a 15V fault signal to the fault level conversion circuit. The fault level conversion circuit converts the 15V fault signal into 3.3V and sends it to the processor DSP. The processor DSP determines that the current channel of the dual-channel oil source conversion device is in a fault state.

[0036] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A dual-channel oil source conversion control method for an aircraft hydraulic system, used to control a dual-channel oil source conversion device, characterized in that: include: Obtain the aircraft status, and when it is determined that the aircraft is in a braking state, send an opening command to the current channel of the dual-channel oil source conversion device; collecting the working status of the current channel of the dual-path oil source conversion device, and when determining that the working status is normal, conducting the current channel; Collect the oil source start-up status signal and the oil source working status signal of the current channel, and when it is determined that the oil source start-up status signal and the oil source working status signal are valid, collect the oil source pressure voltage signal and the brake pressure signal; When it is determined that the oil source pressure reaches a first preset condition and the brake pressure reaches a second preset condition, the current channel is switched.

2. The aircraft hydraulic system dual oil source conversion control method according to claim 1, characterized in that: After collecting the oil source pressure voltage signal and the brake pressure signal, the method further includes: When it is determined that the oil source pressure does not reach the first preset condition or the brake pressure does not reach the second preset condition, the working status of the current channel of the dual-channel oil source conversion device is collected, and when it is determined that the working status is a fault state, the current oil source channel is switched.

3. The aircraft hydraulic system dual oil source switching control method according to claim 1, characterized in that: The method for judging whether the aircraft is in braking state is as follows: When the aircraft parking brake signal is high, the automatic brake signal is high, or the command sensor signal is greater than 1.5V and the speed voltage is greater than 0.2V, it is determined that the anti-skid brake system is in the braking state.

4. The aircraft hydraulic system dual oil source switching control method according to claim 1, characterized in that: After collecting the oil source startup status signal and the oil source working status signal of the current channel, the method further includes: When it is determined that the oil source startup state signal or the oil source working state signal is invalid, the current oil source channel is switched.

5. The aircraft hydraulic system dual oil source switching control method according to claim 1, characterized in that: The working status of the current channel of the dual-channel oil source conversion device is determined as follows: When it is determined that the operating voltage of the current channel of the dual-path oil source conversion device is greater than 24V or less than 16V, the operating state is determined to be a fault state.

6. The aircraft hydraulic system dual oil source switching control method according to claim 1, characterized in that: The working status of the current channel of the dual-path oil source conversion device is collected, including: Performing level conversion on the start instruction and performing signal shaping; The shaped signal is converted into a control signal, and the control signal is used as the working state of the current channel.

7. The aircraft hydraulic system dual oil source conversion control method according to claim 1, characterized in that: The switching of the current channel includes: Send a closing command to the current channel and an opening command to the next channel, use the next channel as the current channel, and re-collect the working status of the current channel of the dual-channel oil source conversion device until the braking is completed.

8. A dual-channel oil source conversion control device for an aircraft hydraulic system, characterized in that: include: The command sending module is used to obtain the status of the aircraft and, when it is determined that the aircraft is in a braking state, send an opening command to the current channel of the dual-channel oil source conversion device; a channel control module, configured to collect the working status of the current channel of the dual-path oil source conversion device according to the opening instruction, and to turn on the current channel when determining that the working status is normal; A signal acquisition module is used to collect the oil source start-up status signal and the oil source working status signal of the current channel, and when it is determined that the oil source start-up status signal and the oil source working status signal are valid, collect the oil source pressure voltage signal and the brake pressure signal; The channel switching module is used to switch the current channel when it is determined that the oil source pressure reaches a first preset condition and the brake pressure reaches a second preset condition.

9. A dual-channel oil source conversion control device for an aircraft hydraulic system according to claim 8, characterized in that: The channel control module includes: a level conversion circuit, the input end of which is connected to the output end of the processor, and is used to perform level conversion on the control instruction output by the processor; A signal shaping circuit, the input end of which is connected to the output end of the level conversion circuit, for performing signal shaping on the converted level signal; The optocoupler control circuit has an input end connected to the output end of the signal shaping circuit, and an output end connected to a dual-channel oil source conversion device for converting the shaped signal into a control signal; The fault acquisition circuit has an input end connected to the output end of the optocoupler control circuit and an output end connected to the processor, and is used to collect the control signal and use the control signal as the working status of the current channel of the dual-channel oil source conversion device.

10. A dual oil source switching control device for an aircraft hydraulic system according to claim 9, characterized in that: The fault acquisition circuit includes: A fault recovery circuit, the input end of which is connected to the output end of the optocoupler control circuit, for collecting the control signal; A fault level conversion circuit, whose input end is connected to the fault recovery circuit, is used to perform level conversion on the control signal.

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