阅读说明：本技术 一种用于机载制氧机的ui指示系统 (UI indicating system for airborne oxygen generator ) 是由 黄俊猊 蒋晓阳 谢萌 杨军 于 2021-10-26 设计创作，主要内容包括：本发明公开了一种用于机载制氧机的UI指示系统,涉及民航机载设备领域,系统包括设置在UI电路板上的主控MCU、EMC处理电路、故障指示灯电路、电压比较器电路、电压射随器电路和电源指示灯电路；所述主控MCU分别与电压射随器电路和EMC处理电路连接；所述电压比较器电路与主控MCU连接；所述故障指示灯电路与主控MCU连接；所述电源指示灯电路与电压比较器电路连接；所述主控MCU内安装有UI指示系统,用于读取制氧机的故障信号,判断故障类型,并根据判断结果生成故障指示灯的控制指令。本发明能为机载制氧机提供状态或故障灯光信号,具备高可靠性,满足民航RTCA DO-160G机载设备环境试验标准。(The invention discloses a UI indicating system for an airborne oxygen generator, which relates to the field of civil aviation airborne equipment, and comprises a main control MCU, an EMC processing circuit, a fault indicating lamp circuit, a voltage comparator circuit, a voltage emitter-follower circuit and a power indicator lamp circuit, wherein the main control MCU, the EMC processing circuit, the fault indicating lamp circuit, the voltage comparator circuit, the voltage emitter-follower circuit and the power indicator lamp circuit are arranged on a UI circuit board; the master control MCU is respectively connected with the voltage emitter follower circuit and the EMC processing circuit; the voltage comparator circuit is connected with the master control MCU; the fault indicator lamp circuit is connected with the main control MCU; the power indicator lamp circuit is connected with the voltage comparator circuit; and a UI indicating system is installed in the main control MCU and used for reading a fault signal of the oxygen generator, judging the fault type and generating a control instruction of a fault indicating lamp according to the judgment result. The invention can provide state or fault light signals for the onboard oxygen generator, has high reliability and meets the environmental test standard of civil aviation RTCA DO-160G onboard equipment.)

1. A UI indicating system for an onboard oxygen generator is characterized by comprising a main control MCU, an EMC processing circuit, a fault indicating lamp circuit, a voltage comparator circuit, a voltage emitter follower circuit and a power indicating lamp circuit, wherein the main control MCU, the EMC processing circuit, the fault indicating lamp circuit, the voltage comparator circuit, the voltage emitter follower circuit and the power indicating lamp circuit are arranged on a UI circuit board; the master control MCU is respectively connected with the voltage emitter follower circuit and the EMC processing circuit; the voltage comparator circuit is connected with the master control MCU; the fault indicator lamp circuit is connected with the main control MCU; the power indicator lamp circuit is connected with the voltage comparator circuit; and a UI indicating system is installed in the main control MCU and used for reading a fault signal of the oxygen generator, judging the fault type and generating a control instruction of a fault indicating lamp according to the judgment result.

2. The UI indication system for an onboard oxygen generator as claimed in claim 1, wherein the voltage emitter follower circuit comprises a voltage emitter follower and a buzzer, the buzzer is connected with the voltage emitter follower; the voltage emitter-follower is connected with the main control MCU.

3. The UI indication system for an onboard oxygen generator as claimed in claim 1, wherein the voltage comparator circuit comprises a voltage comparator and a current signal input interface, the current signal input interface is connected with the voltage comparator; and the voltage comparator is respectively connected with the main control MCU and the power indicator circuit.

4. The UI indicating system for the onboard oxygen generator according to claim 1, wherein the UI indicating system specifically comprises an interrupt module, a timer module, a judgment module and an indicator light control module, wherein the interrupt module is used for triggering an interrupt event according to an interrupt signal and generating a judgment signal corresponding to the interrupt event;

the judging module is used for carrying out signal analysis on the judging signal according to a judging principle and judging the fault type corresponding to the interrupt event;

the indicating lamp control module is used for generating an indicating lamp control instruction according to the fault type judged by the judging module;

the timer module is used for setting an interrupt signal to judge a main cycle value, a timer timeout value and a judgment time interval.

5. The UI indication system for an onboard oxygen generator as claimed in claim 4, wherein the judgment principle specifically comprises:

a, the previous fault cannot be judged to be an important fault or a common fault;

b, when the previous fault is an important fault, the next important fault is generated at an interval of 20S; in this case, the failure time interval is less than 29S;

c: when the former fault is a common fault, the next common fault is generated at an interval of 30S under normal conditions, if a fault signal is generated again, the level of the signal is higher than that of the common signal necessarily, namely, an important fault, so that the first fault is a common fault, and when a fault occurs in 29S, the fault can be judged to be an important fault;

d: whether the former fault is an important fault or a common fault, the former fault is separated from the latter fault by 30S, and the latter fault can be judged to be a common fault;

e: whether the former fault is an important fault or a common fault, the interval between the former fault and the latter fault signal exceeds 30S, and then the fault can be judged to disappear.

6. The UI indication system for an onboard oxygen generator as claimed in claim 1, further comprising a power interface for accessing an external power source, wherein the EMC processing circuit is connected with the power interface.

7. The UI indication system for an onboard oxygen generator as claimed in claim 1, further comprising a key interface for sending a start-up signal, wherein the main control MCU is connected with the key interface.

Technical Field

The invention relates to the field of civil aviation airborne equipment, in particular to a UI indicating system for providing a state or fault light signal of an airborne oxygen generator.

Background

Modern aircraft usually flies in high altitude (7000-1.5 kilometers are high altitude, and more than 1.5 kilometers are ultrahigh altitude), and in order to ensure safety and comfort of passengers flying in high altitude, civil aircraft all adopt atmospheric supercharged cabins. The outside air is pressurized by the pressurizing device and then sent into the cabin, the increased air pressure meets the requirement of human body on the oxygen content of the air, and the ventilation can be adjusted to make the temperature and the humidity meet the physiological requirement, so that passengers have a comfortable and safe living environment in high-altitude flight. In the case of a boeing aircraft, air is pressurized by the engine and fed into the cabin. Even if the aircraft flies at ten thousand meters of altitude, the atmospheric environment in the cabin is similar to that at an altitude of about 1500 meters.

At present, the civil aviation administration (CAAC for short) in China requires that an airline company operates high altitude flights (the altitude of an airport is more than or equal to 3000 m), and when the height of a cockpit is more than or equal to 3000 m, a pilot on duty needs to supplement oxygen inhalation. Airlines generally adopt a mode of preparing a standby oxygen cylinder in a cockpit to provide oxygen for pilots, but the mode has the problems of limited oxygen cylinder capacity, certain risk of oxygen cylinder storage and high maintenance and operation cost of the oxygen cylinder.

Now, the development of an onboard oxygen generator is planned, and the principle of molecular sieve oxygen generation is utilized to filter and purify oxygen in air, so that oxygen meeting corresponding regulations is provided for pilots. Through early market investigation, the current domestic market does not have an onboard oxygen generator suitable for a civil aviation large aircraft and a corresponding complete machine engineering solution.

In the process of developing the airborne oxygen generator, the UI module in the airborne oxygen generator needs to be independently researched and developed, so that the equipment can adapt to the complex airborne electric operating environment of the civil aviation aircraft.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides the UI indicating system for the onboard oxygen generator, can provide a state or fault light signal for the onboard oxygen generator, has high reliability, and meets the environmental test standard of RTCA DO-160G onboard equipment.

The purpose of the invention is realized by the following technical scheme:

a UI indicating system for an onboard oxygen generator comprises a main control MCU, an EMC processing circuit, a fault indicating lamp circuit, a voltage comparator circuit, a voltage emitter follower circuit and a power indicating lamp circuit, which are arranged on a UI circuit board; the master control MCU is respectively connected with the voltage emitter follower circuit and the EMC processing circuit; the voltage comparator circuit is connected with the master control MCU; the fault indicator lamp circuit is connected with the main control MCU; the power indicator lamp circuit is connected with the voltage comparator circuit; and a UI indicating system is installed in the main control MCU and used for reading a fault signal of the oxygen generator, judging the fault type and generating a control instruction of a fault indicating lamp according to the judgment result.

Specifically, the voltage emitter follower circuit comprises a voltage emitter follower and a buzzer, and the buzzer is connected with the voltage emitter follower; the voltage emitter-follower is connected with the main control MCU.

The voltage comparator circuit comprises a voltage comparator and a current signal input interface, and the current signal input interface is connected with the voltage comparator; and the voltage comparator is respectively connected with the main control MCU and the power indicator circuit.

The UI indicating system specifically comprises an interruption module, a timer module, a judgment module and an indicator light control module, wherein the interruption module is used for triggering an interruption event according to an interruption signal and generating a judgment signal corresponding to the interruption event;

the judging module is used for carrying out signal analysis on the judging signal according to a judging principle and judging the fault type corresponding to the interrupt event;

the indicating lamp control module is used for generating an indicating lamp control instruction according to the fault type judged by the judging module;

the timer module is used for setting an interrupt signal to judge a main cycle value, a timer timeout value and a judgment time interval.

Specifically, the judgment principle specifically includes:

a, the previous fault cannot be judged to be an important fault or a common fault;

b, when the previous fault is an important fault, the next important fault is generated at an interval of 20S; in this case, the failure time interval is less than 29S;

c: when the former fault is a common fault, the next common fault is generated at an interval of 30S under normal conditions, if a fault signal is generated again, the level of the signal is higher than that of the common signal necessarily, namely, an important fault, so that the first fault is a common fault, and when a fault occurs in 29S, the fault can be judged to be an important fault;

d: whether the former fault is an important fault or a common fault, the former fault is separated from the latter fault by 30S, and the latter fault can be judged to be a common fault;

e: whether the former fault is an important fault or a common fault, the interval between the former fault and the latter fault signal exceeds 30S, and then the fault can be judged to disappear.

In addition, the system also comprises a power interface and a key interface. The power interface is used for accessing an external power supply, and the EMC processing circuit is connected with the power interface. The key interface is used for sending a starting signal, and the main control MCU is connected with the key interface.

The invention has the beneficial effects that:

1. the invention provides state or fault light signals for the onboard oxygen generator, and forms a complete onboard oxygen generation solution for the civil aviation transportation large aircraft.

2. The equipment designed by the invention has high reliability, meets the environmental test standard of RTCA DO-160G airborne equipment, and fills up domestic vacancy.

3 the development cost and the production cost of the invention are far lower than the average cost of foreign airborne equipment.

Drawings

FIG. 1 is a schematic block diagram of a system device of the present invention.

Fig. 2 is an EMC processing circuit block diagram.

FIG. 3 is a circuit diagram of a voltage follower.

Fig. 4 is a circuit diagram of a fault indicator lamp.

Fig. 5 is a master MCU circuit diagram.

Fig. 6 is a voltage comparator circuit diagram.

Fig. 7 is a logic diagram of software system operation.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

In the invention, the UI circuit board (UI module) mainly has the function of providing a state or fault light signal of the onboard oxygen generator. The UI module is provided with two LED indicator lamps, wherein one LED indicator lamp is a red/yellow double-color indicator lamp, and the other LED indicator lamp is a green indicator lamp. The signal input is a fault buzzer signal of a core component of the oxygen generator, and the working state is indicated by judging the signal and controlling the combination of the indicator lamps.

The technical problem solved by the invention is as follows: for the civil aviation machine carries the oxygenerator and provides running state and fault indication function, and equipment satisfies civil aviation machine and carries equipment service standard, specifically includes:

the environment condition of RTCA DO-160G airborne equipment and the 17 th voltage saving spike requirement in a test program are met;

the requirements of environmental conditions of RTCA DO-160G airborne equipment and the sensitivity of the 18 th section of audio conduction in a test program are met;

the environmental condition of RTCA DO-160G airborne equipment and the sensitivity requirement of section 19 induction signals in a test program are met;

the environmental conditions of RTCA DO-160G airborne equipment and the radio frequency sensitivity (radiation and conduction) requirement of section 20 in a test program are met;

the environment condition of RTCA DO-160G airborne equipment and the radio frequency energy emission requirement of section 21 in a test program are met;

aiming at the RTCA DO-160G requirement, the UI module circuit is designed to meet the use requirement of the civil aviation airborne environment, and the specific design process is shown in the following embodiment.

The first embodiment is as follows:

in this embodiment, as shown in fig. 1, a UI indication system for an onboard oxygen generator includes a main control MCU, an EMC processing circuit, a fault indication lamp circuit, a voltage comparator circuit, a voltage emitter circuit, and a power indication lamp circuit, which are disposed on a UI circuit board; the master control MCU is respectively connected with the voltage emitter follower circuit and the EMC processing circuit; the voltage comparator circuit is connected with the master control MCU; the fault indicator lamp circuit is connected with the main control MCU; the power indicator lamp circuit is connected with the voltage comparator circuit; and a UI indicating system is installed in the main control MCU and used for reading a fault signal of the oxygen generator, judging the fault type and generating a control instruction of a fault indicating lamp according to the judgment result.

The fault indicating lamp comprises a red LED lamp and a yellow LED lamp, the red LED lamp is used for indicating important faults, and the yellow LED lamp is used for indicating common faults. The power supply indicating lamp circuit comprises a power supply LED lamp, and the power supply LED lamp is used for indicating the working state of the oxygen generator.

In this embodiment, the voltage emitter follower circuit comprises a voltage emitter follower and a buzzer, and the buzzer is connected with the voltage emitter follower; the voltage emitter-follower is connected with the main control MCU.

The voltage comparator circuit comprises a voltage comparator and a current signal input interface, and the current signal input interface is connected with the voltage comparator; and the voltage comparator is respectively connected with the main control MCU and the power indicator circuit.

In addition, the system also comprises a power interface and a key interface. The power interface is used for accessing an external power supply, and the EMC processing circuit is connected with the power interface. The key interface is used for sending a starting signal, and the main control MCU is connected with the key interface.

Example two:

in this embodiment, the device circuit mainly includes an EMC processing circuit, a voltage emitter, a fault indicator circuit, a voltage comparator, a power indicator circuit, and a main control MCU circuit. The present embodiment is further designed in detail on the module circuit architecture provided in the first embodiment, and the specific design content includes the following aspects:

EMC processing circuit

EMC processing circuit is used for filtering the EMI between UI module and other equipment module, ESD interference, handles mutual interference. The reference circuit is shown in fig. 2.

2. Voltage emitter follower circuit

The voltage emitting and following device circuit is located between the buzzer and the UI module, the buzzer is located on the core circuit of the oxygen generator, the emitting and following device circuit adopts TL9301 with extremely high input impedance for avoiding the influence of the UI module on the core circuit of the oxygen generator, the shunting of the core circuit of the oxygen generator is extremely small, the TL9301 internally comprises an EMI filter, and the EMI filter can filter the interference of the core circuit of the oxygen generator on the UI module. While acting as an impedance match between the two modules. The circuit associated with the voltage follower circuit is shown in fig. 3.

3. Fault indicating lamp circuit

The fault indicating lamp circuit is used for indicating fault conditions of the oxygen generator, the common fault is a yellow lamp, the important fault is red, and the control signal is provided by the main control MCU. The fault indicator circuit reference circuit is shown in fig. 4.

4. Master control MCU circuit

The core of the main control MCU circuit is STC89C52 released by STC company, the chip is an STC89C52 series single chip microcomputer, the characteristics of high speed, low power consumption, ultra-strong anti-interference and the like are achieved, and instruction codes of the enhanced 8051 single chip microcomputer are completely compatible with the traditional 8051. The main control MCU circuit related parameters are as follows: working voltage: 5.5V-3.8V; the working frequency is as follows: 0-35 MHZ; 1280 bytes are integrated on a chip; has EEPROM function; a watchdog; working temperature range: -40 ℃ to +85 ℃; packaging: LQFP-44, PDIP-40, PLCC-44, PQFP-44. The master MCU circuit is shown in fig. 5.

5. Voltage comparator circuit

The voltage comparator circuit compares a current signal input into the UI module by the power supply module with a reference signal, and the circuit design idea is that the voltage signal input by the power supply module is compared with the reference signal and is higher than the reference signal, and the comparator outputs a high level to light the LED lamp. The input voltage of the power supply module is converted from a current signal, the larger the current is, the higher the voltage is, the reference signal is obtained by dividing the power supply voltage, and finally, when the output current of the power supply module is larger than 1A, the LED lamp is lightened. The circuit is shown in fig. 6.

The UI circuit board that this embodiment designed can provide state or trouble light signal for the machine carries oxygenerator, has constituteed the complete big aircraft machine of civil aviation transportation class and has carried the oxygenerator solution. Meanwhile, the equipment has high reliability, meets the environmental test standard of RTCA DO-160G airborne equipment, fills the domestic vacancy, and has the overall development cost and the production cost far lower than the average cost of the foreign airborne equipment.

Example three:

in this embodiment, an embedded UI indication system for processing hardware device data is specifically designed on the basis of the hardware device provided in the second embodiment, and the system is installed in a software function that is mainly implemented to read a fault signal of the oxygen generator, determine the type of the fault, and display the form of the fault indicated lamp after the determination is completed. The intelligent alarm system mainly comprises an interrupt module, a timer module, a judgment module and an indicator lamp control module. The interrupt module is used for triggering an interrupt event according to the interrupt signal and generating a judgment signal corresponding to the interrupt event. The judging module is used for carrying out signal analysis on the judging signal according to the judging principle and judging the fault type corresponding to the interrupt event. And the indicating lamp control module is used for generating an indicating lamp control instruction according to the fault type judged by the judging module. The timer module is used for setting an interrupt signal to judge a main cycle value, a timer timeout value and a judgment time interval.

In this embodiment, the system logic is as shown in fig. 7, where the interrupt triggers: the interrupt triggering is triggered by adopting a falling edge, and because the interrupt signal is high level under normal condition, when a triggering event occurs, the level is pulled down, so that the falling edge triggering is adopted.

Judging the signal, judging whether the trigger signal is a complete trigger signal again, and determining the trigger signal is a low-level trigger signal. And entering the next step, otherwise, not processing and exiting the interrupt.

The time interval judgment is also fault type judgment, and the judgment principle is as follows:

1: the former fault cannot judge whether the fault is an important fault or a common fault;

2: when the former fault is an important fault, the next important fault is generated at an interval of 20S; in this case, the failure time interval is less than 29S,

3: when the former fault is a common fault, the next common fault is generated at an interval of 30S in a normal condition, and if a fault signal is generated again, the level of the signal is higher than that of the common signal, namely, an important fault, so that the first fault is a common fault, and when a fault occurs in 29S, the fault can be judged to be an important fault.

4: the former fault, whether a significant fault or a common fault, is separated from the latter fault signal by 30S, which makes it possible to judge that the latter fault signal is a common fault signal.

5: whether the former fault is an important fault or a common fault, the interval between the former fault and the latter fault signal exceeds 30S, and then the fault can be judged to disappear.

In this embodiment, a system is comprehensively designed based on the design of the first embodiment and the second embodiment, and the design content includes:

environment adaptive design

1. Temperature and humidity

The module PCB board overall arrangement of this embodiment design is gone up the full consideration heat dissipation, and the heat source adopts a large amount of via holes heat dissipation all around, and the device distributes comparatively evenly, does benefit to the heat dissipation. All devices adopt devices with working temperature not lower than the temperature range of minus 25 ℃ to 85 ℃. The working temperature range of-15 to 55 ℃ of the attribute module in DO160-G is met.

The PCB board adopts a circuit board meeting the GB4588 standard. The environmental adaptability of the circuit board is ensured. Three-proofing treatment is performed in the surface production process of the circuit board, so that the circuit board is prevented from being damaged by a damp and hot environment.

2. Electromagnetic compatibility

The module circuit design of the embodiment is added with 2-level EMI treatment, the top of the shell is removed, plastic parts are adopted, and the rest are all metal parts and are subjected to grounding treatment.

3. Impact resistance

The devices adopted on the module of the embodiment are all surface-mounted devices, so that high and large direct-insertion devices which are not beneficial to impact are avoided. The PCB board adopts a circuit board meeting the GB4588 standard, and the impact resistance of the circuit board is ensured. The production place of the module is a chip mounting factory which can produce military circuit boards with high reliability. The device itself has high impact resistance.

Second, design for producibility

All devices of the embodiment adopt the existing mass production devices, and the condition of large-area shortage or device production stop in the mass production process can be avoided when mass production is carried out in the later period.

The circuit board is designed according to the conventional design, no special packaging device is used, no special manual operation device is used, no special process requirement is required, and the circuit board is convenient for mass production.

Third, safety design

The module design process of the embodiment fully considers the safety: the edge of the circuit board is not sharp, so that the circuit board is prevented from being scratched. The selected device is non-flammable and non-explosive, and under extreme conditions, open fire and non-toxic gas can not be generated. And the surface of the module is subjected to flame-retardant spraying to prevent internal and external combustion.

Design of conformity

The module design process of the embodiment is strictly executed according to the design requirement book and conforms to the relevant standards of RTCA/DO-16-G and RTCA/DO-313 and middle aviation.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.