WO2021082872A1

WO2021082872A1 - Miniaturized circuit for controlling reliable parachute opening of survival parachute and performing online detection

Info

Publication number: WO2021082872A1
Application number: PCT/CN2020/119513
Authority: WO
Inventors: 贾琳琳; 万天军; 刘浠; 庞桂林; 赵瑜; 贾晓迪; 万小川
Original assignee: 航宇救生装备有限公司
Priority date: 2019-10-30
Filing date: 2020-09-30
Publication date: 2021-05-06

Abstract

A miniaturized circuit for controlling reliable parachute opening of a survival parachute and performing online detection, comprising a plurality of air pressure sensors, a control module, a detection circuit, an ignition output module, a state storage module, and a power supply module, wherein the control module is separately connected to the plurality of air pressure sensors, the detection circuit, the ignition output module, and the state storage module; the power supply module is separately connected to the plurality of air pressure sensors, the control module, the detection circuit, the ignition output module, and the state storage module. The design of the miniaturized circuit for controlling the reliable parachute opening of the survival parachute and performing online detection can be applicable to controlling the parachute opening of various survival parachutes, and can be widely used during the departure of a passenger from a large aircraft to ensure the normal work of an electronic parachute opener circuit.

Description

Miniaturized circuit for controlling the reliable opening of the life-saving umbrella and online detection

Technical field

The invention relates to a miniaturized circuit for controlling the reliable opening of the life-saving umbrella and online detection.

Background technique

At present, a mechanical umbrella opener is usually used to control the opening of the rescue umbrella. The mechanical parachute opener is large in size and heavy in weight. However, the current large aircraft design has very strict requirements on the volume and weight, and it is difficult to meet the requirements of the use of the mechanical parachute opener. It is necessary to design a circuit with a small size, light weight and high reliability to control the opening of the life-saving umbrella, and to perform self-checking on each part of the circuit to ensure the reliable operation of the circuit.

Summary of the invention

The technical problem to be solved by the present invention is to provide a miniaturized circuit for controlling the reliable opening of the life-saving umbrella and online detection in response to the above-mentioned defects in the prior art, and realizing the miniaturized circuit for controlling the reliable opening of the life-saving umbrella and online detection. The design can be applied to control the opening of various life-saving umbrellas, and can be widely used when the occupants of large aircrafts leave the plane to ensure that the electronic parachute opener circuit works normally.

The technical solutions adopted by the present invention to solve the above technical problems are:

A miniaturized circuit for controlling the reliable opening of a life-saving umbrella and online detection, comprising a plurality of air pressure sensors, a control module, a detection circuit, an ignition output module, a state storage module and a power supply module. The control module is respectively connected with a plurality of air pressure sensors and detection circuits , The ignition output module is connected with the state storage module, and the power supply module is respectively connected with a plurality of air pressure sensors, control modules, detection circuits, ignition output modules and state storage modules.

According to the above technical scheme, the number of control modules, detection circuits, ignition output modules, and status storage modules are all two, and they are divided into two groups. The control modules in each group correspond to the detection circuit, ignition output module and status storage of the corresponding group. Module connection, each air pressure sensor is connected to two control modules.

According to the above technical solution, the output end of the ignition output module is connected with the cutter of the life-saving umbrella.

According to the above technical scheme, the control module includes an LC8051F500-A 8-bit microprocessor.

According to the above technical solution, the air pressure sensor is a BMP280 digital pressure sensor.

According to the above technical solution, the number of air pressure sensors is three.

According to the above technical scheme, the umbrella opening method implemented with a miniaturized circuit that controls the reliable opening of the life-saving umbrella and online detection includes the following steps:

1) The control module performs initialization and power-on self-check, and reads the parachute opening delay time and parachute opening height set in the status storage module;

2) Enter the monitoring program of the control module, press the self-check button, if the voltage value collected by the control module is less than the specified voltage value, it will enter the self-check state, otherwise it will enter the control umbrella state;

3) After entering the control parachute-opening state, the current air pressure value is detected by the air pressure sensor in real time to calculate the current altitude, and judge whether the parachute opening delay time and the current altitude meet the parachute opening conditions. If the parachute opening conditions are met, the parachute is opened. If the conditions for opening the umbrella are met, wait until the conditions for opening the umbrella are met and open the umbrella;

4) Control the falling speed after opening the parachute. If the falling speed is less than 0.5m/s for 3 consecutive seconds, it is judged that the electronic parachute opener has landed.

According to the above technical solution, in the step 3), the parachute opening condition is: the current height drops below 3000m, and the falling speed is not less than 6m/s for 3s after power-on.

According to the above technical solution, the height of the air pressure sensor is three. In the step 3), the current air pressure value is detected by the air pressure sensor in real time to calculate the current altitude. The specific process is: If the static pressure value of the three-way air pressure sensor The absolute value of the difference between the two is less than the threshold, and the average value of the three-way air pressure sensor data is taken as the effective value of the pressure to collect altitude information. There are two sets of absolute values of the difference between the static pressure values of the three-way air pressure sensor are less than the threshold value. , One group is greater than the threshold, take the middle value of the three-channel air pressure sensor data as the effective pressure value; if the absolute value of the difference between the three-channel air pressure sensor static pressure value is less than the threshold, the difference between the two groups is greater than or equal to the threshold , The output static pressure is the average value of the two-way pressure signal whose difference is less than the threshold; if the three sets of differences between the static pressure values of the three-way air pressure sensor are greater than or equal to the threshold, the maximum value of the three-way air pressure sensor data is taken as valid value.

According to the above technical solution, in the step 1), the parachute opening delay time is 3s, and the parachute opening height is 3000m.

The present invention has the following beneficial effects:

The miniaturized circuit design for controlling the reliable opening of the life-saving umbrella and online detection is realized by the present invention, which is suitable for controlling the opening of various life-saving umbrellas, and can be widely used when the occupants of large aircrafts leave the plane. At the same time, the height and time can be set. Adjust the height and time according to actual needs; record the information during the parachuting process, which is convenient for data analysis when the electronic parachute opener fails; and conduct online detection of each part of the circuit to ensure that the electronic parachute opener circuit works normally .

Description of the drawings

Fig. 1 is a schematic diagram of a miniaturized circuit for controlling the reliable opening of the life-saving umbrella and online detection in an embodiment of the present invention;

2 is a block diagram of the connection circuit between the control module and the detection circuit in the embodiment of the present invention;

Fig. 3 is a circuit block diagram of an air pressure sensor in an embodiment of the present invention;

Fig. 4 is a circuit block diagram of a state storage module in an embodiment of the present invention;

Figure 5 is a circuit block diagram of an ignition output module in an embodiment of the present invention;

Fig. 6 is a circuit block diagram of a power supply module in an embodiment of the present invention;

FIG. 7 is a diagram of the external interface of the built-in software of the control module in the embodiment of the present invention;

Figure 8 is a flowchart of an umbrella opening method in an embodiment of the present invention;

Detailed ways

The present invention will be described in detail below with reference to the drawings and embodiments.

1 to 8, a miniaturized circuit for controlling the reliable opening and online detection of a life-saving umbrella according to an embodiment of the present invention includes a plurality of air pressure sensors, control modules, detection circuits, ignition output modules, State storage module and power supply module. The control module is connected to multiple air pressure sensors, detection circuits, ignition output modules, and state storage modules, and the power supply module is connected to multiple air pressure sensors, control modules, detection circuits, ignition output modules, and state storage modules, respectively. connection.

Further, the number of control modules, detection circuits, ignition output modules, and status storage modules are all two, and they are divided into two groups. The control modules in each group are respectively connected to the detection circuit, ignition output module, and status storage module of the corresponding group. , Each air pressure sensor is connected to two control modules.

Further, the power supply module is respectively connected with a plurality of air pressure sensors, two control modules, two detection circuits, two ignition output modules and two status storage modules.

Further, each control module is connected with a detection port.

Further, the output end of the ignition output module is connected with the cutter of the life-saving umbrella.

Further, the control module includes an LC8051F500-A 8-bit microprocessor.

Further, the air pressure sensor is a BMP280 digital pressure sensor.

Further, the number of air pressure sensors is three.

Further, the umbrella opening method implemented with a miniaturized circuit that controls the reliable opening of the life-saving umbrella and online detection includes the following steps:

2) Enter the monitoring program of the control module and press the self-check button. If the voltage value collected by the control module is less than the specified voltage value (here, the voltage collection interface of the control module is the collection port connected between the control module and the power supply module), then enter the self-check Status, otherwise enter the control parachute status;

Further, in the step 2), the self-checking process of entering the self-checking state is: the air pressure sensor value is between 26kPa and 110kPa, then it is judged that the air pressure sensor is working normally; because the voltage value of the P3.3 port of the control module is less than 0.5V, it is judged that the energy storage module and the boost module are working normally; the voltage value of the P3.2 port of the acquisition control module is between 2 and 3V, then the battery and the voltage stabilizing circuit are working normally. At this time, the P3.0, The P3.1 port outputs pulse signals, and the voltage value of the P3.4 port of the acquisition control module is not less than 0.2V, then the control module, ignition output module and cutter work normally. After the above online detection, all parts of the electronic umbrella opener circuit work normal.

Further, in the step 3), the parachute opening conditions are: the current height drops below 3000m, and the falling speed is not less than 6m/s for 3 consecutive seconds after power-on.

Further, in the step 3), the specific process of judging whether the parachute-opening condition is satisfied is: judging whether the parachute-opening delay time reaches 3s from the power-on timing to the moment, and when the time is up, judging whether the height is 3000m; If the time is not enough, wait until the time is up to 3s; then judge whether the current altitude is greater than 3000m. If it is greater than 3000m, it will wait to land to 3000m, and after power-on, the falling speed of continuous 3s is not less than 6m/s, then control the life-saving parachute to open; not more than 3000m, and the falling speed of continuous 3s after power-on is not less than 6m/s, then control The life-saving umbrella is opened. And after controlling the opening of the parachute, the height of the parachute opening is stored in the EEPROM respectively.

Further, the height of the air pressure sensor is three. In the step 3), the current air pressure value is detected by the air pressure sensor in real time, so as to calculate the specific process of the current height: If the static pressure values of the three air pressure sensors are two by two The absolute value of the difference is less than the threshold (the threshold is 3kPa), and the average value of the three-channel air pressure sensor data is taken as the effective value of the pressure to collect altitude information. The absolute value of the difference between the static pressure values of the three-channel air pressure sensor is two If the group is less than the threshold, and the group is greater than the threshold, take the middle value of the three-way air pressure sensor data as the effective pressure value; if the absolute value of the difference between the static pressure values of the three-way air pressure sensor is less than the threshold, the difference between the two Is greater than or equal to the threshold, the output static pressure is the average value of the two pressure signals whose difference is less than the threshold; if the three sets of differences between the static pressure values of the three pressure sensors are greater than or equal to the threshold, take the maximum of the three pressure sensor data The value is regarded as the effective value; the air pressure value is converted into altitude by the look-up table method, and the converted altitude information is collected and stored in the state storage module EEPROM.

Further, in the step 1), the parachute opening delay time is 3s, and the parachute opening height is 3000m.

In Figure 2, J1 is the interface between the control module and the air pressure sensor module, the state storage module, the ignition output module, and the power supply module, and J4 is the interface for the programming program and the interface for TTL level communication. Due to the miniaturization design requirements, the volume and weight should be reduced as much as possible under the condition of meeting the functional requirements. Considering that the self-check data collection requires 3 channels of A/D, the LC8051F500-A 8-bit microprocessor is selected. LC8051F500-A only needs a few peripheral circuits to form a single-chip microcomputer system integrating data acquisition, control and communication functions, which can effectively reduce the size of the circuit board, thereby reducing the volume of the entire processor unit.

In Figure 3, J2 is the interface between the air pressure sensor module and the control module and the power supply module; height information is one of the key parameters for controlling the opening of the rescue parachute. The present invention senses the current air pressure through the air pressure sensor module, and obtains the height through a certain conversion relationship, and then determines whether to control the life-saving parachute to open. Taking into account the miniaturization of the circuit design, the BMP280 digital pressure sensor is selected, with its own temperature compensation, and the I2C bus for data transmission.

In Figure 4, J3 is the interface between the state storage module, the control module, and the power supply module. The status storage module is used to store the data of the control chip, including parachuting delay time, parachute opening height; the latest 3 self-check status records; the latest parachuting height, parachute opening height, total dead time, and fall time after parachute opening. SPI interface communication is adopted between the state storage module and the control module.

In Figure 5, J4 is the interface between the ignition output module, the control module, and the power supply module. The ignition control circuit is composed of the pulse signal output by the I/O port of the control module, an integral detector circuit, a transistor switch circuit, and a relay. The pulse signal output by the I/O port is detected by the detector circuit to turn on the two switching transistors respectively. The relay works to control the output of the ignition signal. The contact ends of the two relays are connected in series to avoid abnormal output of the ignition signal due to the short circuit of the switching transistor.

In Figure 6, J6 is the interface between the power supply module and the control module, air pressure sensor module, status storage module, and ignition output module. Since the operating voltage of the control module, air pressure sensor module, and status storage module is 3.3V, a voltage regulator circuit is needed to convert the battery voltage from 7.2V to 3.3V. Since the excitation energy of the cutter is 200uf capacitor, charging to 15V directly discharges both poles of the cutter, and the battery voltage is 7.2V, so the boost circuit and capacitor charging circuit are designed. The boost circuit and capacitor charging circuit are collectively called energy storage modules. Taking into account the product's wide operating temperature range, long storage and long service life, and considering the miniaturization of the circuit design, the lithium thionyl chloride primary battery is used as the power source, and the rated voltage of the battery is 7.2V.

The working principle of the present invention:

The miniaturized circuit design that controls the reliable parachute opening and online detection of the rescue umbrella. When the electronic parachute opener is powered on, it performs initialization and power-on self-test, and reads the parachute opening time and parachute height stored in the EEPROM, and then performs system monitoring. If it is judged to control the opening of the parachute, it will be delayed from the power-on timing to judge whether the parachute opening height is reached, and at the same time, it is judged that the falling speed is not less than 6m/s for 3 consecutive seconds after the machine. After the power is turned on, the height information will be collected continuously. After the umbrella is opened, the falling speed is judged at the same time. If the falling speed is less than 0.5m/s for 3 consecutive seconds, it is judged that the electronic umbrella opener has landed. After pressing the self-check button, if the voltage value collected by the P3.3 port of the microprocessor is judged to be less than 0.5V, it will enter the self-check state.

The miniaturized circuit design to control the reliable opening of the life-saving umbrella and online detection includes the following steps:

(1) The electronic parachute opener is powered on and performs initialization and power-on self-check, and reads the parachute opening time and parachute height stored in the EEPROM;

(2) Enter the system monitoring program, press the self-check button, the voltage value collected by the P3.3 port of the microprocessor is less than 0.5V and enter the self-check state, otherwise it enters the control umbrella state;

(3) When entering the control parachute opening state, judge whether the parachute opening delay time and the parachute opening height have met the conditions, and whether the falling speed for continuous 3s after power-on is not less than 6m/s, open the parachute if the conditions are met, and wait until the conditions are not met. Satisfy the conditions to open the umbrella;

(4) Control the falling speed after opening the umbrella. If the falling speed is less than 0.5m/s for 3 consecutive seconds, it is determined that the electronic umbrella opener has landed;

(5) Enter the self-check state, and the air pressure sensor value is between [26kPa, 110kPa], it is judged that the air pressure sensor is working normally; because the voltage value of the P3.3 port is less than 0.5V, it is judged that the energy storage module and the boost module are working normally; If the voltage value of P3.2 port is between [2,3] V, the battery and voltage stabilizing circuit are working normally. At this time, P3.0 and P3.1 ports output pulse signals, and the voltage value of P3.4 port is not less than 0.2 V, the control module, the ignition output module and the cutter work normally. Through the above online detection, the electronic umbrella opener circuit works normally.

Further, in order to ensure the reliable opening of the life-saving umbrella, each part of the control circuit adopts a redundant design; at the same time, to ensure a miniaturized circuit design, miniaturized patch devices are mainly used.

Furthermore, in order to ensure the accuracy and reliability of the height information collected by the electronic umbrella opener, and considering the miniaturization design, the BMP280 digital air pressure sensor from Bosch was selected. The circuit is designed as a three-channel air pressure sensor, the absolute value of the difference between the three-channel static pressure values is less than the threshold (3kPa), and the average value of the three-channel data is taken as the effective value of the pressure to collect height information. There are two sets of absolute values of the difference between two values that are less than the threshold, and one set is greater than the threshold. Take the middle value of the three-way data as the effective pressure value; if the absolute value of the two-way difference between the three-way static pressure values has a set of differences less than Threshold, the difference between the two groups is greater than or equal to the threshold, and the output static pressure is the average value of the two pressure signals with the difference less than the threshold; if the three sets of differences are greater than or equal to the threshold, the maximum value of the three data is taken as the effective value. Therefore, even if any air pressure sensor fails, it will not affect the normal operation of the electronic umbrella opener.

Further, in order to ensure that the electronic parachute opener is working properly afterwards, after the electronic parachute opener is powered on, it collects the height information during parachuting and saves it in EEPROM; after controlling the life-saving parachute to open, collect the height information during parachuting and save it Enter EEPROM; after judging the landing, calculate the total dead time and fall time after opening the umbrella and store it in EEPROM.

Effect: The electronic umbrella opener can ensure reliable operation through online detection, and control the life-saving umbrella to open.

The working process of a specific embodiment provided by the present invention:

The miniaturized circuit design for controlling the reliable opening of the life-saving umbrella and online detection, taking the opening height of 3000 and the delay time of 3s as an example, includes:

Step 1: The electronic parachute opener is powered on, and the two sets of microprocessors perform initialization and power-on self-check respectively, and read the parachute opening time 3s and the parachute opening height 3000m stored in the EEPROM; because there are 3 air pressure sensors, the air pressure value The calculation method is: if the absolute value of the difference between the three-channel static pressure values is less than the threshold (3kPa), take the average of the three-channel data as the effective value of the pressure to collect the height information, and the three-channel static pressure values are paired by two There are two groups of absolute values of the difference less than the threshold, one group is greater than the threshold, and the middle value of the three-channel data is the effective value of the pressure; if the absolute value of the difference between the three-channel static pressure values is less than the threshold, two If the group difference is greater than or equal to the threshold, the output static pressure is the average value of the two pressure signals with the difference less than the threshold; if the three groups of differences are greater than or equal to the threshold, the maximum value of the three data is taken as the effective value. Use the look-up table method to convert the air pressure value into altitude, collect and store the converted altitude information into EEPROM;

Step 2: Enter the system monitoring program, press the self-check button, then the voltage values collected by the P3.3 ports of the two microprocessors will be less than 0.5V and enter the self-check state, otherwise it will enter the control umbrella state;

Step 3: When entering the control parachute open state, the two sets of microprocessors make judgments separately. Judge whether the parachute opening delay time is 3s from the moment of power-on timing. When the time is up, judge whether the altitude meets 3000m; if the time is less than, wait until the time reaches 3s; then judge whether the current altitude is greater than 3000m. If it is greater than 3000m, it will wait to land to 3000m, and after power-on, the falling speed of continuous 3s is not less than 6m/s, then control the life-saving parachute to open; not more than 3000m, and the falling speed of continuous 3s after power-on is not less than 6m/s, then control The life-saving umbrella is opened. And after controlling the opening of the umbrella, store the height of the opening in the EEPROM respectively

Step 4: After controlling the opening of the parachute, the two sets of microprocessors respectively judge the falling speed. If the falling speed is less than 0.5m/s for 3 consecutive seconds, it is determined that the electronic umbrella opener has landed. Calculate the total dead time and fall time after opening the parachute and store them in EEPROM respectively.

Step 5: Enter the self-inspection state, and the two sets of microprocessors perform self-inspection separately. If the air pressure sensor value is between [26kPa, 110kPa], it is judged that the air pressure sensor module is working normally; because the voltage value of the P3.3 port is less than 0.5V, it is judged that the energy storage module is working normally; the voltage value of the P3.2 port is collected in [2, 3] Between V, the battery and voltage stabilizing circuit work normally. At this time, the P3.0 and P3.1 ports output pulse signals, and the voltage value of the P3.4 port is not less than 0.2V, then the control module, ignition output module and cutting The device is working properly. Through the above online detection, each part of the two circuits of the electronic umbrella opener works normally.

The above are only preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the scope of the patent application of the present invention still belong to the protection scope of the present invention.

Claims

A miniaturized circuit for controlling the reliable opening of a life-saving umbrella and online detection, which is characterized in that it includes a plurality of air pressure sensors, a control module, a detection circuit, an ignition output module, a state storage module and a power supply module. The sensor, the detection circuit, the ignition output module and the state storage module are connected, and the power supply module is respectively connected with a plurality of air pressure sensors, the control module, the detection circuit, the ignition output module and the state storage module.
The miniaturized circuit for controlling the reliable opening of the rescue umbrella and online detection according to claim 1, wherein the number of the control module, the detection circuit, the ignition output module and the state storage module are all two, and they are divided into two groups , The control module in each group is respectively connected with the detection circuit, ignition output module and state storage module of the corresponding group, and each air pressure sensor is respectively connected with two control modules.
The miniaturized circuit for controlling the reliable opening of the life-saving umbrella and online detection according to claim 1, wherein the output end of the ignition output module is connected to the cutter of the life-saving umbrella.
The miniaturized circuit for controlling the reliable opening of the rescue umbrella and online detection according to claim 1, wherein the control module includes an LC8051F500-A 8-bit microprocessor.
The miniaturized circuit for controlling the reliable opening of the rescue umbrella and online detection according to claim 1, wherein the air pressure sensor is a BMP280 digital pressure sensor.
The miniaturized circuit for controlling the reliable opening of the rescue umbrella and online detection according to claim 1, wherein the number of air pressure sensors is three.
The miniaturized circuit for controlling the reliable opening of the rescue umbrella and online detection according to claim 1, wherein the method for opening an umbrella implemented by a miniaturized circuit for controlling the reliable opening of the rescue umbrella and online detection includes the following steps:

1) The control module performs initialization and power-on self-check, and reads the parachute opening delay time and parachute opening height set in the status storage module;

2) Enter the monitoring program of the control module, press the self-check button, if the voltage value collected by the control module is less than the specified voltage value, it will enter the self-check state, otherwise it will enter the control umbrella state;

3) After entering the control parachute open state, the current air pressure value is detected by the air pressure sensor in real time to calculate the current altitude, and judge whether the parachute opening delay time and the current altitude meet the parachute opening conditions. If the parachute opening conditions are met, open the parachute. If the conditions for opening the umbrella are met, then wait until the conditions for opening the umbrella are met to open the umbrella.
The miniaturized circuit for controlling the reliable opening of the rescue parachute and online detection according to claim 7, characterized in that, in the step 3), the parachute opening condition is: the current height drops below 3000m, and after power-on The falling speed for continuous 3s is not less than 6m/s.
The miniaturized circuit for controlling the reliable opening of the rescue umbrella and online detection according to claim 1, wherein the height of the air pressure sensor is three, and in the step 3), the current air pressure value is detected in real time by the air pressure sensor , The specific process of calculating the current altitude is: if the absolute value of the difference between the static pressure values of the three air pressure sensors is less than the threshold, the average value of the three air pressure sensors is taken as the effective value of the pressure to collect the altitude information , The absolute value of the difference between the static pressure values of the three-channel air pressure sensor has two groups less than the threshold value, and one group is greater than the threshold value. Take the middle value of the three-channel air pressure sensor data as the effective pressure value; if the static pressure value of the three-channel air pressure sensor is two The absolute value of the difference between the two groups has a difference of less than the threshold, and the difference of the two groups is greater than or equal to the threshold, and the output static pressure is the average value of the two pressure signals with the difference less than the threshold; if the static pressure of the three pressure sensors is between three The group difference value is greater than or equal to the threshold value, and the maximum value of the three-channel air pressure sensor data is taken as the effective value.
The miniaturized circuit for controlling the reliable opening of the rescue umbrella and online detection according to claim 1, wherein in said step 1), the opening delay time is 3s, and the opening height is 3000m;

After the step 3), it also includes the following steps: control the umbrella to determine the falling speed, if the falling speed is less than 0.5m/s for 3 consecutive seconds, then it is determined that the electronic umbrella opener has landed.